10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

 X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2011.

OR

__ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________ to __________.

Commission file number   001-13643

ONEOK, Inc.

(Exact name of registrant as specified in its charter)

Oklahoma	73-1520922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
100 West Fifth Street, Tulsa, OK	74103
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code   (918) 588-7000

Securities registered pursuant to Section 12(b) of the Act:

Common stock, par value of $0.01	New York Stock Exchange
(Title of each class)	(Name of each exchange on which registered)

Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes X No__

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes __  No X

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes X  No __

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every

Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes X No __

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Registration S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. X  

Indicate by checkmark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check one) Large accelerated filer XAccelerated filer __         Non-accelerated filer __           Smaller reporting company __

Indicate by checkmark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes__ No X

Aggregate market value of registrant’s common stock held by non-affiliates based on the closing trade price on June 30, 2011, was $7.3 billion.

On February 14, 2012, the Company had 103,893,790 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the definitive proxy statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held May 23, 2012, are incorporated by reference in Part III.

ONEOK, Inc.

2011 ANNUAL REPORT

Part I.		Page No.
Item 1. Item 1A. Item 1B.	Business Risk Factors Unresolved Staff Comments	5-19 19-34 34
Item 2.	Properties	35-36
Item 3.	Legal Proceedings	36-37
Item 4.	Mine Safety Disclosures	37
Part II.
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	37-39
Item 6.	Selected Financial Data	40
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operation	40-67
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	68-71
Item 8.	Financial Statements and Supplementary Data	73-123
Item 9. Item 9A. Item 9B.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure Controls and Procedures Other Information	123 123-124 124
Part III.
Item 10.	Directors, Executive Officers and Corporate Governance	124
Item 11.	Executive Compensation	124
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	125
Item 13.	Certain Relationships and Related Transactions, and Director Independence	125
Item 14.	Principal Accounting Fees and Services	125
Part IV.
Item 15.	Exhibits, Financial Statement Schedules	126-132
Signatures		133

As used in this Annual Report, references to “we,” “our” or “us” refer to ONEOK, Inc., an Oklahoma corporation, and its predecessors and subsidiaries, unless the context indicates otherwise.

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GLOSSARY

The abbreviations, acronyms and industry terminology used in this Annual Report are defined as follows:

AFUDC Allowance for funds used during construction

Annual Report Annual Report on Form 10-K for the year ended December 31, 2011

ASU Accounting Standards Update

Bbl Barrels, 1 barrel is equivalent to 42 United States gallons

Bbl/d Barrels per day

BBtu/d Billion British thermal units per day

Bcf Billion cubic feet

Bcf/d Billion cubic feet per day

Btu(s) British thermal units, a measure of the amount of heat required to raise the  temperature of one pound of water one degree Fahrenheit

Bushton Plant Bushton Gas Processing Plant

CFTC Commodities Futures Trading Commission

Clean Air Act Federal Clean Air Act, as amended

Clean Water Act Federal Water Pollution Control Act Amendments of 1972, as amended

Dodd-Frank Act Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010

EBITDA Earnings before interest expense, income taxes, depreciation and amortization

EPA United States Environmental Protection Agency

Exchange Act Securities Exchange Act of 1934, as amended

FASB Financial Accounting Standards Board

FERC Federal Energy Regulatory Commission

GAAP Accounting principles generally accepted in the United States of America

Guardian Pipeline Guardian Pipeline, L.L.C.

Intermediate Partnership ONEOK Partners Intermediate Limited Partnership, a wholly owned subsidiary  of ONEOK Partners, L.P.

IRS Internal Revenue Service

KCC Kansas Corporation Commission

KDHE Kansas Department of Health and Environment

LDCs Local distribution companies

LIBOR London Interbank Offered Rate

MBbl Thousand barrels

MBbl/d Thousand barrels per day

Mcf Thousand cubic feet

MDth/d Thousand dekatherms per day

Midwestern Gas Transmission Midwestern Gas Transmission Company

MMBbl Million barrels

MMBtu Million British thermal units

MMBtu/d Million British thermal units per day

MMcf Million cubic feet

MMcf/d Million cubic feet per day

Moody’s Moody’s Investors Service, Inc.

Natural Gas Act Natural Gas Act of 1938, as amended

Natural Gas Policy Act Natural Gas Policy Act of 1978, as amended

NGL products Marketable natural gas liquid purity products, such as ethane, ethane/propane  mix, propane, iso-butane, normal butane and natural gasoline

NGL(s) Natural gas liquid(s)

Northern Border Pipeline Northern Border Pipeline Company

NYMEX New York Mercantile Exchange

NYSE New York Stock Exchange

OBPI ONEOK Bushton Processing, L.L.C., formerly ONEOK Bushton Processing, Inc.

OCC Oklahoma Corporation Commission

ONEOK ONEOK, Inc.

ONEOK 2011 Credit Agreement ONEOK's five-year, $1.2 billion revolving credit agreement dated April 5, 2011

ONEOK Credit Agreement ONEOK’s amended and restated $1.2 billion revolving credit agreement dated  July 14, 2006

ONEOK Partners ONEOK Partners, L.P.

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ONEOK Partners 2011 Credit Agreement ONEOK Partners’ five-year, $1.2 billion revolving credit agreement dated  August 1, 2011

ONEOK Partners Credit Agreement ONEOK Partners’ $1.0 billion amended and restated revolving credit agreement  dated March 30, 2007

ONEOK Partners GP ONEOK Partners GP, L.L.C., a wholly owned subsidiary of ONEOK and the sole  general partner of ONEOK Partners

OPIS Oil Price Information Service

OSHA Occupational Safety and Health Administration

Overland Pass Pipeline Company Overland Pass Pipeline Company LLC

Quarterly Report(s) Quarterly Report(s) on Form 10-Q

POP Percent of Proceeds

RRC Railroad Commission of Texas

S&P Standard & Poor’s Rating Services

SEC Securities and Exchange Commission

Securities Act Securities Act of 1933, as amended

Viking Gas Transmission Viking Gas Transmission Company

XBRL eXtensible Business Reporting Language

The statements in this Annual Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements.  Forward-looking statements may include words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled”  and other words and terms of similar meaning.  Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations and assumptions will be achieved.  Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 1A, “Risk Factors,” and Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation and “Forward-Looking Statements,” in this Annual Report.

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PART I

ITEM 1.                      BUSINESS

GENERAL

We are a diversified energy company and successor to the company founded in 1906 known as Oklahoma Natural Gas Company.  We are a corporation incorporated under the laws of the state of Oklahoma and our common stock is listed on the NYSE under the trading symbol “OKE.”  We are the sole general partner and own 42.8 percent of ONEOK Partners, L.P. (NYSE: OKS), one of the largest publicly traded master limited partnerships.  ONEOK Partners is a leader in the gathering, processing, storage and transportation of natural gas in the United States.  In addition, ONEOK Partners owns one of the nation’s premier natural gas liquids systems, connecting NGL supply in the Mid-Continent and Rocky Mountain regions with key market centers.  We are the largest natural gas distributor in Oklahoma and Kansas and the third largest natural gas distributor in Texas, providing service as a regulated public utility to wholesale and retail customers.  Our largest distribution markets are Oklahoma City and Tulsa, Oklahoma; Kansas City, Wichita and Topeka, Kansas; and Austin and El Paso, Texas.  Our energy services business is engaged in providing premium natural gas marketing services to its customers across the United States.

EXECUTIVE SUMMARY

North American natural gas production continues to increase at a faster rate than demand, primarily as a result of increased production from unconventional resource areas, such as shale plays.  Because of the relatively higher market prices of crude oil and NGLs, drilling activity is especially robust in shale plays with crude oil and NGL-rich natural gas production.  As a result, we expect producers to focus development efforts on crude oil and NGL-rich supply basins rather than areas with dry natural gas production.  We expect inter-regional opportunities for midstream infrastructure development driven by producers who need to connect emerging production with end use markets where current infrastructure is either insufficient or nonexistent.

In 2011, producers continued to drill aggressively in a number of NGL-rich resource plays in the Mid-Continent and Rocky Mountain regions, creating a need for additional infrastructure to bring this new supply to market.  The resulting increase in natural gas supply has caused lower natural gas prices, less volatility and narrower natural gas location and seasonal price differentials in the markets we serve.

Additionally, we have seen strong ethane demand from the petrochemical sector in the Gulf Coast, due to the price advantage ethane has over other feedstocks.  Consequently, NGL pipeline capacity between the Conway, Kansas, and Mont Belvieu, Texas, market centers is constrained and contributes to wider location price differentials between those markets.  The natural gas supply growth has also increased NGL supply in the Mid-Continent, coupled with increased demand in the Gulf Coast, resulting in decreased NGL prices in the Mid-Continent market center at Conway, Kansas, relative to prices in the Gulf Coast market center at Mont Belvieu, Texas.

Additional fractionation and pipeline capacity is needed to accommodate the growing NGL supply and demand, as well as new infrastructure to gather, process and transport growing natural gas production from both new and existing resource plays.  In response to this increased production and demand for NGL products, ONEOK Partners is investing approximately $2.7 billion to $3.3 billion in new capital projects to meet the needs of oil and natural gas producers in the Bakken Shale, the Cana-Woodford Shale and the Granite Wash areas, and for additional NGL infrastructure in the Mid-Continent and Gulf Coast areas that will enhance the distribution of NGL products to meet the increasing petrochemical industry and NGL export demand.  When completed, ONEOK Partners expects these projects to provide additional earnings and cash flows.

During 2011, we paid cash dividends of $2.16 per share, an increase of approximately 18.7 percent from the $1.82 per share paid during 2010.  In January 2012, we declared a dividend of $0.61 per share ($2.44 per share on an annualized basis), an increase of approximately 17.3 percent from the $0.52 declared in January 2011.

During 2011, ONEOK Partners paid cash distributions to its limited partners of $2.325 per unit, an increase of approximately 4.3 percent from the $2.23 per unit paid during 2010.  In January 2012, a cash distribution to ONEOK Partners’ limited partners of $0.61 per unit ($2.44 per unit on an annualized basis) was declared, an increase of approximately 7.0 percent from the $0.57 declared in January 2011.

In January 2012, we completed an underwritten public offering of $700 million of 4.25-percent senior notes due 2022.  The net proceeds from the offering, after deducting underwriting discounts and estimated expenses, of approximately $693.9 million were used to repay amounts outstanding under our $1.2 billion commercial paper program and for general corporate purposes, which may include one or more of the following:  the repurchase of our common stock, the purchase of additional common units of ONEOK Partners and the payment of dividends.

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During 2011, we relied primarily on operating cash flow, commercial paper and distributions from ONEOK Partners to fund our short-term liquidity and capital requirements, repay $400 million of maturing senior notes and redeem $90.5 million of 6.4-percent senior notes.  In January 2011, ONEOK Partners completed an underwritten public offering of senior notes generating net proceeds of approximately $1.28 billion.  ONEOK Partners utilized proceeds from its January 2011 debt issuance, its cash from operations and its commercial paper program, to repay $225 million of its maturing senior notes and to fund its capital projects and short-term liquidity needs.

In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

We anticipate that our cash flow generated from operations, existing capital resources, including proceeds from the issuance of our $700 million 4.25-percent senior notes issued in January 2012, and distributions from ONEOK Partners will enable us to maintain our current level of operations, our planned operations and fund the remainder of our three-year, $750 million stock repurchase program.  ONEOK Partners anticipates that its cash flow generated from operations, existing capital resources and ability to obtain financing will enable it to maintain its current level of operations and its planned operations.  Additionally, ONEOK Partners expects to fund its capital expenditures with short- and long-term debt, the issuance of equity and operating cash flows.

See Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation, for more information on our growth projects, results of operations, liquidity and capital resources.

BUSINESS STRATEGY

Our primary business strategy is to deliver consistent growth and sustainable earnings, while focusing on safe, reliable and environmentally responsible operations for our customers, employees, contractors and the public through the following:

·   Operate in a safe, reliable and environmentally responsible manner - environmental, safety and health issues continue to be a primary focus for us; our emphasis on personal and process safety has produced improvements in the key indicators we track.  We also continue to look for ways to reduce our environmental impact by conserving resources and utilizing more efficient technologies;

·   Generate consistent growth and sustainable earnings - during 2011, ONEOK Partners’ cash distributions increased by 9.5 cents, an approximate 4.3-percent increase compared with 2010; ONEOK Partners is investing approximately $2.7 billion to $3.3 billion in new capital projects to meet the needs of oil and natural gas producers in the Bakken Shale, the Cana-Woodford Shale and the Granite Wash areas, and to provide additional NGL infrastructure in the Mid-Continent and Gulf Coast areas that will enhance its ability to distribute NGL products to meet the increasing petrochemical industry and NGL export demand.  When completed, these projects are anticipated to provide additional earnings and cash flows.  Our Natural Gas Distribution segment benefits from rate strategies, including a performance-based rate mechanism in Oklahoma, capital-recovery mechanisms in Kansas and portions of Texas and cost-of-service adjustments in certain Texas jurisdictions that address investments in rate base and changes in expense; our Natural Gas Distribution segment’s operating efficiencies include investments in automated meters in Oklahoma and Texas.  Our Energy Services segment has undertaken several steps to realign fixed costs with its current business environment, including attempts to renegotiate various storage and transportation agreements and continuing to realign its contracted storage and transportation capacity with its customers’ premium-service requirements;

·   Execute strategic acquisitions that provide long-term value - we remain a disciplined buyer of assets and continue to evaluate assets that come to market.  We did not consummate any acquisitions in 2011;

·   Manage our balance sheet to maintain strong credit ratings - our balance sheet remains strong, ending 2011 with a capital structure of 45-percent debt and 55-percent equity, excluding the debt of ONEOK Partners.  We will seek to maintain our investment-grade credit ratings; and

·   Attract, develop and retain employees to support strategy execution - we continue to execute on our recruiting strategy that targets colleges, universities and vocational-technical schools in our operating areas.  We also continue development efforts with our employees.

NARRATIVE DESCRIPTION OF BUSINESS

We report operations in the following business segments:

·   ONEOK Partners;

·   Natural Gas Distribution; and

·   Energy Services.

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ONEOK Partners

Overview - ONEOK Partners is a diversified master limited partnership involved in the gathering, processing, storage and transportation of natural gas in the United States.  In addition, ONEOK Partners owns one of the nation’s premier natural gas liquids systems, connecting NGL supply in the Mid-Continent and Rocky Mountain regions with key market centers.

We own approximately 84.8 million common and Class B limited partner units, and the entire 2-percent general partner interest, which, together, represent a 42.8-percent ownership interest in ONEOK Partners.  We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights.  See Note P of the Notes to Consolidated Financial Statements in this Annual Report for discussion of our incentive distribution rights.

We and ONEOK Partners maintain significant financial and corporate governance separations.  We seek to receive increasing cash distributions as a result of our investment in ONEOK Partners, and our investment decisions are made based on the anticipated returns from ONEOK Partners in total, not specific to any of ONEOK Partners’ businesses individually.  To aid in understanding the important business and financial characteristics of our ONEOK Partners segment, the following describes its business with reference to its underlying activities.

Natural gas gathering and processing business - ONEOK Partners’ natural gas gathering and processing business provides nondiscretionary services to producers that include gathering and processing of natural gas produced from crude oil and natural gas wells.  ONEOK Partners gathers and processes natural gas in the Mid-Continent region, which includes the NGL-rich Cana-Woodford Shale and Granite Wash formations; the Mississippian Lime formation of Oklahoma and Kansas; and the Hugoton and Central Kansas Uplift Basins of Kansas.  It also gathers and/or processes natural gas in two producing basins in the Rocky Mountain region:  the Williston Basin, which spans portions of Montana and North Dakota and includes the oil-producing, NGL-rich Bakken Shale and Three Forks formations; and the Powder River Basin of Wyoming.  In the Powder River Basin, the natural gas that ONEOK Partners gathers is coal-bed methane, or dry, natural gas that does not require processing or NGL extraction in order to be marketable; dry, natural gas is gathered, compressed and delivered into a downstream pipeline or marketed for a fee.

In the Mid-Continent region and the Williston Basin, unprocessed natural gas is compressed and transported through pipelines to processing facilities where volumes are aggregated, treated and processed to remove water vapor, solids and other contaminants, and to extract NGLs in order to provide marketable natural gas, commonly referred to as residue gas.   The residue gas, which consists primarily of methane, is compressed and delivered to natural gas pipelines for transportation to end users.  When the NGLs are separated from the unprocessed natural gas at the processing plants, the NGLs are in the form of a mixed, unfractionated NGL stream.  ONEOK Partners’ natural gas and NGLs are sold to affiliates and a diverse customer base.

Revenue from the natural gas gathering and processing business is derived primarily from the following three types of contracts:

·   POP - ONEOK Partners retains a percentage of the NGLs and/or a percentage of the residue gas as payment for gathering, treating, compressing and processing the producer’s natural gas.  This type of contract represented approximately 37 percent and 35 percent of gathering and processing contracted volumes for 2011 and 2010, respectively.

·   Fee - ONEOK Partners is paid a fee for the services it provides based on Btus gathered, treated, compressed and/or processed.  This type of contract represented approximately 60 percent and 61 percent of gathering and processing contracted volumes for 2011 and 2010, respectively.

·   Keep-whole - ONEOK Partners extracts NGLs from unprocessed natural gas and returns to the producer volumes of residue gas containing the same amount of Btus as the unprocessed natural gas that was originally delivered.  This type of contract represented approximately 3 percent and 4 percent of gathering and processing contracted volumes for 2011 and 2010, respectively, with approximately 75 percent and 85 percent, respectively, of that volume under contracts that effectively convert into fee contracts when the gross processing spread is negative.

Natural gas pipelines business - ONEOK Partners’ natural gas pipeline business owns and operates regulated natural gas transmission pipelines, natural gas storage facilities and natural gas gathering systems for unprocessed natural gas.  ONEOK Partners also provides interstate natural gas transportation and storage services in accordance with Section 311(a) of the Natural Gas Policy Act.

ONEOK Partners’ FERC-regulated interstate assets transport natural gas through pipelines that access supply from Canada and from the Mid-Continent, Rocky Mountain and Gulf Coast regions.  ONEOK Partners’ intrastate natural gas pipeline assets are located in Oklahoma, Texas and Kansas, and have access to major natural gas producing areas in those states.  ONEOK Partners owns underground natural gas storage facilities in Oklahoma, Kansas and Texas.

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ONEOK Partners’ revenues from its natural gas pipelines are derived typically from fee-based services provided to its customers under the following types of fee-based contracts:

·   Firm service - Customers can reserve a fixed quantity of pipeline or storage capacity for the terms of their contracts.  Under firm-service contracts, the customer pays a fixed fee for a specified quantity regardless of their actual usage and is generally guaranteed access to the capacity they reserve; and

·   Interruptible service - Customers may utilize available capacity after firm-service requests are satisfied or on an as-available basis.  Under the interruptible service contract, the customer is provided capacity in of our pipelines and storage facilities on an interruptible basis.

Natural gas liquids business - ONEOK Partners’ natural gas liquids business gathers, treats, fractionates, stores and transports NGLs and distributes and stores NGL products.  ONEOK Partners’ natural gas liquids gathering pipelines deliver unfractionated NGLs gathered from natural gas processing plants located in Oklahoma, Kansas, Texas and the Rocky Mountain region to fractionators it owns in Oklahoma, Kansas and Texas, as well as to third-party fractionators and pipelines.  The NGLs are then separated through the fractionation process into the individual NGL products that realize the greater economic value of the NGL components.  The individual NGL products are then stored or distributed to petrochemical manufacturers, heating-fuel users, refineries and propane distributors through ONEOK Partners’ FERC-regulated distribution pipelines that move NGL products from Oklahoma and Kansas to the Mid-Continent and Gulf Coast NGL market centers, as well as the Midwest markets near Chicago, Illinois.

Revenue for the natural gas liquids business is derived primarily from fee-based services provided to ONEOK Partners’ customers and physical optimization of its assets.  The sources of revenue are categorized as follows:

·   ONEOK Partners’ exchange services business primarily collects fees to gather, fractionate and treat unfractionated NGLs, thereby converting them into marketable NGL products that are stored and shipped to a market center or customer-designated location.

·   ONEOK Partners’ optimization and marketing business utilizes our assets, contract portfolio and market knowledge to capture location and seasonal price differentials.  ONEOK Partners transports NGL products between the Mid-Continent and Gulf Coast in order to capture the location price differentials between the two market centers.  ONEOK Partners’ natural gas liquids storage facilities are also utilized to capture seasonal price variances.

·   ONEOK Partners’ pipeline transportation business transports raw NGLs, finished NGL products and refined petroleum products primarily under our FERC-regulated tariffs.  Tariffs specify the rates ONEOK Partners charges its customers and the general terms and conditions for NGL transportation service on its pipelines.

·   ONEOK Partners’ isomerization business captures the price differential when normal butane is converted into the more valuable iso-butane at its isomerization unit in Conway, Kansas.  Iso-butane is used in the refining industry to increase the octane of motor gasoline.

·   ONEOK Partners’ storage business collects fees to store NGLs at its Mid-Continent and Gulf Coast facilities.

Market Conditions and Seasonality - Supply - Natural gas and NGL supply is affected by drilling rig availability, operating capability and producer drilling activity, which are sensitive to commodity prices, exploration success, the liquid content of the natural gas that is produced and processed, access to capital and regulatory control.  Higher crude oil prices and advances in horizontal drilling and completion technologies are having a positive impact on drilling activity in the oil and NGL-rich shale areas and other resource plays, providing an offset to the less favorable supply projections in the dry gas areas.  As new supply is developed, ONEOK Partners’ customers may require incremental services to bring their production to market.

In the Rocky Mountain region, Williston Basin volumes continue to grow as drilling activity increases, driven primarily by producer development of Bakken Shale crude oil wells, which also produce associated natural gas containing significant amounts of NGLs.  However, ONEOK Partners’ natural gas gathering and processing business has seen declines in natural gas volumes gathered in the Powder River Basin, which is dry gas.

In the Mid-Continent region, ONEOK Partners expects increased drilling activity in the Cana-Woodford Shale and Granite Wash areas of western Oklahoma and the Mississippian Lime formation of Oklahoma and Kansas to more than offset the volumetric declines in most conventional wells that supply ONEOK Partners’ natural gas gathering and processing facilities and intrastate natural gas pipelines and storage assets.

ONEOK Partners’ interstate natural gas pipelines access supply from major producing regions in the Mid-Continent, Rocky Mountain, Gulf Coast and Canada.

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ONEOK Partners expects the overall supply of NGLs to continue to increase as well as demand for fee-based services as a result of the development of shale areas and other resource plays.  Many new natural gas processing plants are being constructed in Oklahoma and the Texas Panhandle to process NGL-rich natural gas being produced in the Cana-Woodford Shale, the Granite Wash, the Woodford Shale and the emerging Mississippian Lime formations.  ONEOK Partners’ NGL gathering and fractionation operations receive NGLs from a variety of processors and pipelines, including affiliates, located in these regions.

ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses are also affected by operational or market-driven changes that impact the output of natural gas processing plants.  The differential between the composite price of NGL products and the price of natural gas, particularly the differential between the price of ethane and the price of natural gas, may influence processing plant NGL output.  During 2011, ethane prices remained significantly above natural gas prices on a relative Btu basis, which resulted in an economic incentive for ethane recovery from ONEOK Partners’ natural gas processing plants and third-party natural gas processing plants that deliver NGLs to ONEOK Partners’ natural gas liquids gathering pipelines.

Demand-Demand for natural gas gathering and processing services is aligned typically with the production of natural gas from natural gas plays or the associated natural gas from wells drilled in crude oil plays.  Gathering and processing are nondiscretionary services that producers require to market their natural gas and natural gas liquid production.  As producers continue to develop shale and other resource plays, ONEOK Partners expects demand for its gathering and processing services to increase.  ONEOK Partners’ natural gas processing plant operations can be adjusted to respond to market conditions, such as demand for ethane.  By changing operating parameters at certain plants, ONEOK Partners can reduce, to some extent, the amount of ethane and propane recovered in its processing plants if prices or processing margins are unfavorable.

Demand for natural gas pipeline transportation service and natural gas storage is related directly to demand for natural gas in the markets that the natural gas pipelines and storage facilities serve, and is affected by weather, the economy and natural gas price volatility.  ONEOK Partners’ natural gas pipelines primarily serve end-users, such as natural gas distribution companies and electric-generation companies, that require natural gas to operate their businesses and generally are not impacted by location price differentials.  However, narrower location differentials may impact demand for ONEOK Partners’ services from natural gas marketers as discussed below under “Commodity Prices.”  Demand for ONEOK Partners’ natural gas pipelines services can also be impacted as coal-fired electric generators consider natural gas as an alternative fuel.

The strength of the economy directly impacts manufacturing and industrial companies that consume natural gas.  Commodity price volatility can influence producers’ decisions related to the production of natural gas, the level of NGLs processed from natural gas and natural gas storage injection and withdrawal activity.

Demand for NGLs and the ability of natural gas processors to sustain successfully and economically their operations impacts the volume of unfractionated NGLs produced by natural gas processing plants, thereby affecting the demand for NGL gathering, fractionation and distribution services.  Natural gas and propane are subject to weather-related seasonal demand.  Other NGL products are affected by economic conditions and the demand associated with the various industries that utilize the commodity, such as butanes and natural gasoline, which are used by the refining industry as blending stocks for motor fuel, denaturant for ethanol and diluents for crude oil.  Ethane, propane, normal butane and natural gasoline are used by the petrochemical industry to produce chemical products, such as plastics, rubber and synthetic fibers.  During 2011, several petrochemical companies announced new plants, plant expansions, additions or enhancements that improve the light-NGL feed capability of their facilities due primarily to the increased supply and attractive price of ethane as a petrochemical feedstock in the United States.  These projects are expected to increase significantly ethane demand over the next five years.  In addition, international demand for propane is expected to impact the NGL market in the future.  ONEOK Partners expects this increase in demand for NGLs to add incremental fee-based earnings to its natural gas liquids business.

Commodity Prices - Crude oil, natural gas and NGL prices can be volatile due to changes in market conditions.  Commodity prices can also be impacted by demand for products from the petrochemical industry and other consumers, storage injection and withdrawal rates and available storage capacity.  The increase in natural gas supply from shale gas development has caused natural gas prices to decline and natural gas location and seasonal price differentials to narrow across most of the regions where ONEOK Partners operates.  However, an increase in crude oil prices and the abundance of NGLs produced from the development of NGL-rich shale resource plays have made producing NGL feedstocks for the petrochemical industry more profitable.  ONEOK Partners is exposed to commodity price risk in its natural gas gathering and processing business, as a result of receiving commodities in exchange for services, primarily on POP contracts, and in its natural gas liquids business from the NGLs it purchases and sells.  ONEOK Partners is also exposed to market risk associated with the price differentials between receipt and delivery points along its natural gas and natural gas liquids pipelines, also known as location

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differentials.  Fluctuations in location differentials impact the rates its natural gas pipelines’ customers with competitive alternatives are willing to pay and the optimization opportunities for its natural gas liquids business.  ONEOK Partners’ natural gas and NGL storage revenues are impacted by the differential between the forward price of natural gas and NGLs and the price of natural gas and NGLs on the spot market.  Additionally, fluctuations in the relative price differential between natural gas, NGLs and individual NGL products impacts ONEOK Partners’ natural gas liquids exchange services and transportation revenues and, to a lesser extent, margins on its natural gas gathering and processing keep-whole contracts.

Seasonality - Our ONEOK Partners segment’s products are subject to weather-related seasonal demand.  Cold temperatures typically increase demand for natural gas and propane, which are used to heat homes and businesses.  Warm temperatures typically drive demand for natural gas used for natural gas-fired electric generation needed to meet the electricity-generation demand required to cool residential and commercial properties.  Precipitation levels also can impact the demand for natural gas that is used to fuel irrigation activity in the Mid-Continent region and demand for propane used to fuel crop-drying activity.  Demand for butane and natural gasoline, which are used primarily by the refining industry as blending stocks for motor fuel, denaturant for ethanol and diluents for crude oil, may also be subject to some variability as automotive travel increases and as seasonal gasoline formulation standards are implemented.  During periods of peak demand for a certain commodity, prices for that product typically increase, which may influence processing and fractionation decisions.

Competition - ONEOK Partners’ natural gas and natural gas liquids businesses compete directly with other companies for natural gas and NGL supplies, markets and services.  Competition for natural gas transportation services continues to increase as new infrastructure projects are completed and the FERC and state regulatory bodies continue to encourage additional competition in the natural gas markets.  Competition is based primarily on fees for services, quality of services provided, current and forward natural gas and NGL prices and proximity to supply areas and markets.  ONEOK Partners believes that the location and integration of its assets enable it to compete effectively.

ONEOK Partners’ natural gas gathering and processing business competes for natural gas supplies with independent exploration and production companies that have gathering and processing assets, pipeline companies and their affiliated marketing companies, national and local natural gas gatherers and processors, and marketers in the Mid-Continent and Rocky Mountain regions.  ONEOK Partners’ natural gas liquids business competes with other fractionators, storage providers, gatherers and transporters for NGL supplies in the Rocky Mountain, Mid-Continent and Gulf Coast regions.  The factors that typically affect ONEOK Partners’ ability to compete for natural gas and NGL supplies are:

·   fees charged under its contracts;

·   pressures maintained on its gathering systems;

·   location of its assets relative to those of its competitors;

·   location of its assets relative to drilling activity;

·   efficiency and reliability of its operations; and

·   receipt and delivery capabilities that exist in each system, plant, fractionator and storage location.

ONEOK Partners is responding to these factors by making capital investments to access new supplies; increasing gathering, fractionation, storage and transportation capacity; increasing storage, withdrawal and injection capabilities; and improving natural gas processing efficiency and reducing operating costs.  ONEOK Partners’ competitors have also recently announced plans for new natural gas gathering and processing facilities and natural gas liquids pipelines and fractionators to address the growing natural gas and NGL supply and petrochemical demand.  When completed, ONEOK Partners’ growth projects and those of its competitors are expected to impact NGL prices and narrow location differentials between the Mid-Continent and Gulf Coast market centers.  ONEOK Partners is also evaluating asset consolidation opportunities to maximize earnings and renegotiating low-margin contracts.  The principal goal of the contract renegotiation effort is to improve margins and reduce risk.

Government Regulation - The FERC traditionally has maintained that a natural gas processing plant is not a facility for the transportation or sale for resale of natural gas in interstate commerce and, therefore, is not subject to jurisdiction under the Natural Gas Act.  Although the FERC has made no specific declaration as to the jurisdictional status of ONEOK Partners’ natural gas processing operations or facilities, ONEOK Partners’ natural gas processing plants are primarily involved in extracting NGLs and, therefore, ONEOK Partners believes, its natural gas processing plants are exempt from FERC jurisdiction.  The Natural Gas Act also exempts natural gas gathering facilities from the jurisdiction of the FERC.  ONEOK Partners believes its natural gas gathering facilities and operations meet the criteria used by the FERC for nonjurisdictional gathering facility status.  However, ONEOK Partners is subject to newly adopted FERC regulations that require it to post publicly certain natural gas flow information on ONEOK Partners’ website.  Interstate transmission facilities remain subject to FERC jurisdiction.  The FERC has distinguished historically between these two types of facilities, either interstate or intrastate, on a fact-specific basis.  ONEOK Partners also transports residue gas from its natural gas processing plants to interstate pipelines in accordance with Section 311(a) of the Natural Gas Policy Act.

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Oklahoma, Kansas, Wyoming, Montana and North Dakota also have statutes regulating, in various degrees, the gathering of natural gas in those states.  In each state, regulation is applied on a case-by-case basis if a complaint is filed against the gatherer with the appropriate state regulatory agency.

ONEOK Partners’ interstate natural gas pipelines are regulated under the Natural Gas Act and Natural Gas Policy Act, which give the FERC jurisdiction to regulate virtually all aspects of the pipeline activities.  ONEOK Partners’ intrastate natural gas transportation assets in Oklahoma, Kansas and Texas are regulated by the OCC, KCC and RRC, respectively.  ONEOK Partners has flexibility in establishing natural gas transportation rates with customers.  However, there are maximum rates that ONEOK Partners can charge its customers in Oklahoma and Kansas.

ONEOK Partners’ proprietary natural gas liquids gathering pipelines, fractionation and storage facilities in Oklahoma, Kansas and Texas are not regulated by the FERC or the states’ respective corporation commissions.  ONEOK Partners’ remaining natural gas liquids pipelines are regulated by the FERC, which has authority over the terms and conditions of service, rates, including depreciation and amortization policies, and initiation of service.  In Kansas and Texas, ONEOK Partners’ intrastate natural gas liquids pipelines that provide common carrier services are subject to the jurisdiction of the KCC and RRC, respectively, which have oversight regarding services provided.

See further discussion in the “Environmental and Safety Matters” section.

Unconsolidated Affiliates - Our ONEOK Partners segment has investments in unconsolidated affiliates that include Northern Border Pipeline, Overland Pass Pipeline Company, three partnerships that operate natural gas gathering systems located primarily in the Powder River of Wyoming and other investments.  Northern Border Pipeline is a leading transporter of natural gas imported from Canada into the United States.  Overland Pass Pipeline Company operates an interstate natural gas liquids pipeline system that transports natural gas liquids from the Rocky Mountain region to the Mid-Continent NGL market center.

See Note O of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of ONEOK Partners’ unconsolidated affiliates.

Natural Gas Distribution

Overview - Our Natural Gas Distribution segment provides natural gas distribution services to more than 2 million customers in Oklahoma, Kansas and Texas through Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service.  We serve residential, commercial, industrial and transportation customers in all three states.  In addition, our LDCs serve wholesale and public authority customers.  We operate subject to regulations and oversight of the state regulatory agencies.  Our regulatory strategy incorporates features that reduce earnings lag, protect margin and mitigate risks.

Our strategies to reduce earnings lag include a performance-based rate mechanism in Oklahoma and capital-recovery mechanisms in Kansas and portions of Texas.  In addition, we also have cost-of-service adjustments in certain Texas markets that address investments in rate base and changes in operating expenses.

Margin protection strategies include increasing the portion of our service fees that is fixed rather than volumetrically based.  Customer consumption is a function of price levels and weather conditions.  Weather normalization mechanisms limit our sensitivity to weather.

Risk mitigation strategies include mechanisms to recover the fuel-related component of bad debts in Oklahoma, Kansas and portions of Texas and pension and other post-retirement benefits and ad valorem taxes in Kansas.

Our operating results are affected primarily by the number of customers, usage and the ability to collect delivery rates that provide a reasonable rate of return on our investment and recovery of our cost of service.  Natural gas costs are passed through to our customers based on the actual cost of natural gas purchased by the respective natural gas distribution companies and related expenses.  Substantial fluctuations in natural gas sales can occur from year to year without materially or adversely impacting our net margin, since the fluctuations in natural gas costs affect natural gas sales and cost of gas by an equivalent amount.  Higher natural gas costs may cause customers to conserve or use alternative energy sources.  Higher natural gas costs may also impact adversely our accounts receivable collections, resulting in higher bad-debt expense.  Recovery of the fuel-related portion of bad debts is allowed in all three states.

Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service distribute natural gas as public utilities to approximately 82 percent, 67 percent and 14 percent of the natural gas distribution markets for Oklahoma, Kansas and Texas, respectively.  Natural gas sold to residential and commercial customers accounts for approximately 81 and 18 percent of our natural gas

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sales, respectively, in Oklahoma; 80 and 19 percent of our natural gas sales, respectively, in Kansas; and 69 and 23 percent of our natural gas sales, respectively, in Texas.

In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

Market Conditions and Seasonality - Supply - Our LDCs purchased 163 Bcf and 186 Bcf of natural gas supply in 2011 and 2010, respectively.  Our natural gas supply portfolio consists of long-term, seasonal and short-term contracts from a diverse group of suppliers.  These contracts are awarded through competitive-bidding processes to ensure reliable and competitively priced natural gas supply.  Our Natural Gas Distribution segment’s natural gas supply is acquired from natural gas processing plants, natural gas marketers and natural gas producers.

An objective of our supply-sourcing strategy is to provide value to customers through reliable, competitively priced and flexible gas supply and transportation purchases from multiple production areas and suppliers.  This strategy is designed to protect receipt of supply from being curtailed by physical interruption, possible financial difficulties of a single supplier, natural disasters and other unforeseen force majeure events, as well as ensuring these resources are reliable and flexible to meet the variations of customer demands.

We do not anticipate problems with securing natural gas supply to satisfy customer demand; however, if supply shortages were to occur, each of our LDCs has curtailment tariff provisions in place that provide for:  reducing or discontinuing natural gas service to large industrial users; and requesting that residential and commercial customers reduce their natural gas requirements to an amount essential for public health and safety.  In addition, during times of critical supply disruptions, curtailments of deliveries to customers with firm contracts may be made in accordance with guidelines established by appropriate federal, state and local regulatory agencies.

Natural gas supply requirements are affected by weather conditions.  In addition, economic conditions impact the requirements of our commercial and industrial customers.  Natural gas usage per residential customer may decline as customers change their consumption patterns in response to:  (i) more volatile and higher natural gas prices, as discussed above; (ii)customers’ improving the energy efficiency of existing homes by replacing doors and windows and adding insulation, and retrofitting natural gas appliances with more efficient appliances; (iii) more energy-efficient construction; and (iv) fuel switching.  In each jurisdiction in which we operate, changes in customer usage profiles are considered in the design of our rates.

In managing our natural gas supply portfolios, we partially mitigate price volatility using a combination of financial derivatives and fixed price contracts.  We have natural gas hedging programs in each state that have been approved by the respective states’ regulatory authorities.  We do not utilize financial derivatives for speculative purposes nor do we have trading operations associated with our Natural Gas Distribution segment.  In addition, we utilized 39.3 Bcf of contracted storage capacity in 2011, which allows gas to be purchased during the off-peak season and stored for use in the winter periods.

Demand - See discussion below under “Seasonality” and “Competition” for factors affecting demand for our services.

Seasonality - Natural gas sales to residential and commercial customers are seasonal, as a substantial portion of their natural gas requirements are for heating.  Accordingly, the volume of natural gas sales is higher normally during the months of November through March than in other months of the year.  The impact on margins for our LDCs resulting from weather that is above or below normal is offset in part through weather-normalization adjustments (WNA).  These adjustments have been approved by the regulatory authorities for our Oklahoma, Kansas and certain Texas service territories.  WNA allows us to increase customer billing to offset lower gas usage when weather is warmer than normal and decrease customer billing to offset higher gas usage when weather is colder than normal.

Competition-We encounter competition based on customers’ preference for natural gas, compared with other energy products and their comparative prices.  The most significant product competition occurs between natural gas and electricity in the residential and small commercial markets.  We compete for space and water heating, cooking, clothes drying and other general energy needs.  Customers and builders typically make the decision on the type of equipment at initial installation and use the chosen energy source for the life of the equipment.  The markets in our service territories have become increasingly competitive.  Changes in the competitive position of natural gas relative to electricity and other energy products have the potential to cause a decline in consumption or in the number of natural gas customers.

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However, recent studies have demonstrated that assessing energy efficiency in terms of full fuel-cycle analysis highlights the high overall efficiency of natural gas in residential and commercial uses, compared with electricity.  The Department of Energy recently issued a statement of policy that it will use full fuel-cycle measures of energy use and emissions when evaluating energy-conservation standards for appliances.  Further, independent studies show that natural gas provides a cost advantage over electricity for typical home and business applications.

We believe that we must maintain a competitive advantage in order to retain our customers, and, accordingly, we focus on providing safe, reliable and efficient service and controlling costs.  Our Natural Gas Distribution segment is subject to competition from other pipelines for our existing industrial load.  Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service compete for service to large industrial and commercial customers, and competition has and may continue to impact margins.

Under our transportation tariffs, qualifying industrial and commercial customers are able to purchase their natural gas commodity from the supplier of their choice and have us transport it for a fee.  A portion of transportation services provided is at negotiated rates that are generally below the maximum approved transportation tariff rates.  Reduced rate transportation service may be negotiated when a competitive pipeline is in proximity or another viable energy option is available.  Increased competition could potentially lower these rates.

Government Regulation - Rates charged by LDCs in our Natural Gas Distribution segment for natural gas services are established by the OCC for Oklahoma Natural Gas and by the KCC for Kansas Gas Service.  Texas Gas Service is subject to regulatory oversight by the various municipalities that it serves, which have primary jurisdiction in their respective areas.  Rates in unincorporated areas of Texas and all appellate matters are subject to regulatory oversight by the RRC.  Natural gas supply costs for our LDCs are passed on to our customers through a purchased-gas cost-adjustment mechanism.  We do not make a profit on the cost of natural gas.  Other changes in costs must be recovered through periodic rate adjustments approved by the OCC, KCC, RRC and various municipalities in Texas.  See pages 52 for a detailed description of our various regulatory initiatives.

See further discussion in the “Environmental and Safety Matters” section.

Energy Services

Overview - Our Energy Services segment is a provider of non-uniform natural gas supply and risk-management services for natural gas and electric utilities and commercial and industrial customers with natural gas needs.  We use a network of leased storage and transportation capacity to supply natural gas to our customers.  This network connects the major supply and demand centers throughout the United States and into Canada and, coupled with our industry knowledge and market intelligence, allows us to provide our customers customized services in a more efficient and reliable manner than they can achieve independently.

Strategy - We follow a strategy of optimizing our storage and cross-regional transportation capacity through the application of market knowledge and effective risk management.  We seek to maximize value by actively hedging the risks associated with seasonal and location price differentials that are inherent to storage and transportation contracts.  At the same time, we attempt to capitalize on opportunities created by market volatility, weather-related events, supply-demand imbalances and market inefficiencies, which allow us to capture additional margin.  Using market information, we manage these asset-based positions and seek to provide incremental margin in our trading portfolio.

To ensure natural gas is available when our customers need it, we offer premium services and products that satisfy our customers’ non-uniform supply needs such as swing and peaking natural gas load requirements on a year-round basis.  Types of premium services include next-day and no-notice services.  Next-day services allow our customers to call on additional gas supply, up to an amount agreed upon in a service contract, and expect delivery the following day.  No-notice services allow customers to call on additional gas supply and expect immediate delivery.  We also provide weather-related protection and other custom solutions based on our customers’ specific needs.  Our storage and transportation assets enable us to provide these services and provide us with opportunities to capture daily, monthly and seasonal value due to market inefficiencies.

As a result of significant increases in the supply of natural gas, primarily from shale production across North America, location and seasonal differentials have significantly narrowed, resulting in reduced opportunities to optimize our firm transportation and storage capacity.  Additionally, price volatility in the natural gas markets has diminished, which further limits opportunities to optimize our assets.  We have undertaken several steps to better align fixed costs with the current business environment, including attempts to renegotiate various natural gas storage and transportation contracts.  Contract renegotiation activities that we have taken or expect to consider further include renewing contracts at current market prices at contract expiration, extending contracts in order to negotiate a more favorable rate or paying to terminate contracts in areas that are no longer strategic to our business.  It is possible that we may recognize charges to our earnings as a result of certain of these actions.  These changes would result in a better alignment of our contracted natural gas transportation and storage

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capacity with the needs of our premium-services customers.  We also expect the effect of these strategies to be a reduction in our contracted natural gas transportation and storage capacity, which should reduce our operating costs and working-capital requirements primarily through a reduction in natural gas inventory levels.

Approximately 14 percent of our transportation capacity and approximately 20 percent of our storage capacity expire by the end of 2012, and an additional amount of approximately 64 percent of our transportation capacity and an additional amount of approximately 68 percent of our storage capacity expires by the end of 2015.

Derivatives - It is our intention to minimize the mark-to-market earnings impact that our forward hedges have on current period earnings. When possible, we implement hedging strategies using derivative instruments that qualify as hedges for accounting purposes.  We actively manage the commodity price and volatility risks associated with providing energy risk-management services to our customers by executing derivative instruments in accordance with the parameters established in our commodity risk-management policy.  The derivative instruments consist of over-the-counter transactions such as forward, swap and option contracts, and NYMEX futures and option contracts.

We utilize our experience to optimize the value of our contracted assets and use our risk management and marketing capabilities to both manage risk and generate additional margins.  We apply a combination of cash flow and fair value hedge accounting when implementing hedging strategies that take advantage of favorable market conditions.  See Note D of the Notes to Consolidated Financial Statements in this Annual Report for additional information.  Additionally, certain non-trading transactions, which are economic hedges of our accrual transactions such as certain of our storage and transportation contracts, will not qualify for hedge accounting treatment.  These economic hedges receive mark-to-market accounting treatment, as they are derivative contracts and are not designated as part of a hedge relationship.  As a result, the underlying risk being hedged receives accrual accounting treatment, while we use mark-to-market accounting treatment for the economic hedges.  We cannot predict the earnings fluctuations from mark-to-market accounting, and the impact on earnings could be material.

In prior years, we were able to hedge location differentials and seasonal storage differentials at more favorable levels compared with opportunities currently available to us.  These factors have impacted negatively our Energy Services segment’s results of operations in 2011, and we anticipate these factors will persist throughout 2012 and potentially into 2013.  A significant amount of our storage and transportation hedges that were entered into at favorable levels were realized by the end of 2011.

Working Capital - Our Energy Services segment requires working capital to purchase natural gas inventory, to reserve transportation and storage capacity and to meet cash collateral requirements associated with our risk-management activities.  Our inventory purchases and hedging strategies are implemented with consideration given to ONEOK’s overall working capital requirements and liquidity.  Restrictions on our access to working capital may impact our inventory purchases and risk-management activities, which could impact our results.  Our working capital costs would be impacted by a change in ONEOK’s current investment-grade credit ratings or a significant increase in commodity prices.  See discussion under “Credit Risk” of Note D of the Notes to Consolidated Financial Statements in this Annual Report for additional information about the impact of a change in ONEOK’s credit rating.

Our working capital requirements related to our inventory in storage were as high as $297.9 million during 2011 and had decreased to $215.0 million by December 31, 2011.  In addition, margin requirements can result in increased working capital requirements.  During 2011, the amount we were required to post with counterparties to meet our margin requirements ranged from zero to $22.6 million, and the amount posted for our benefit by our counterparties ranged from zero to $60.5 million.

Sales with Affiliates - Our Energy Services segment conducts business with our ONEOK Partners and Natural Gas Distribution segments.  These services are provided under agreements with market-based terms.  Additionally, business with our LDCs is awarded through a competitive-bidding process.  We provide supply and risk-management service to certain retail marketing operations, including the retail marketing portion of our Natural Gas Distribution segment that was sold in February 2012.

Market Conditions and Seasonality - Supply - Our Energy Services segment maintains a natural gas supply portfolio consisting of various term-length contracted supply in all of the major producing regions, including the Rocky Mountain, Mid-Continent and Gulf Coast.  During periods of high natural gas demand, we utilize storage capacity that allows us to supplement natural gas supply volumes to meet our peak day demand obligations or market needs.

An increase in shale natural gas production and related pipeline construction across North America has resulted in greater natural gas supply, putting downward pressure on natural gas prices and narrowing the price differentials between regions.  The impact of lower natural gas prices and price volatility and narrower location and seasonal price differentials has resulted in reduced opportunities to capture incremental margin through optimization efforts.

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Demand - Demand under our swing and peaking natural gas requirements contracts in our wholesale operation usually is driven by the extent to which temperatures vary from normal levels.  A significant portion of this business is contracted during the winter period of November through March.

The displacement of electric power-generation plants from coal to natural gas is resulting in a slight increase in demand for natural gas.  These displacements are being driven by the cost of natural gas relative to coal and to a lesser extent due to potential government regulations.

Customers continue to contract for storage, transportation and premium services but at lower prices due to lower natural gas prices resulting from the increased supply and lower natural gas price volatility.  Although future improvements in the U.S. economy, coupled with the depressed natural gas price environment, could increase modestly customer demand, we do not anticipate a significant change in customer demand in 2012.

Seasonality -Due to the seasonality of natural gas consumption, storage withdrawals and demand for our products and services, earnings are higher normally during the winter months than the summer months.  Natural gas sales volumes are higher typically in the winter heating months than in the summer months, reflecting increased demand due to greater heating requirements and, typically, higher natural gas prices.

Increased natural gas supply is also impacting negatively the seasonal price differentials.  There could be situations where winter prices are lower, due to mild weather and abundant supply, than the prices in the upcoming summer.  These changes could result in unfavorable pricing between periods that could result in losses on the withdrawal of natural gas from inventory.

Competition - In response to a challenging marketing environment, our strategy is to concentrate our efforts on providing reliable service during peak-demand periods.  We can compete effectively in the market by utilizing our contracted storage and transportation assets.  We continue to focus on building and strengthening supplier and customer relationships to execute our strategy and increase our market presence.

Government Regulation - Our Energy Services segment purchases natural gas for resale at negotiated rates in interstate commerce.  As such, it has been granted by FERC an automatic blanket certificate of public convenience and necessity authorizing such sales.  This is a limited certificate that does not subject our Energy Services segment to any other regulation of FERC under its Natural Gas Act jurisdiction.  Holders of blanket marketing certificates are subject to certain reporting and document retention requirements.

Market conditions and uncertainties associated with the implementation of financial reform through the Dodd-Frank Act have reduced liquidity in the financial derivatives markets, particularly for basis swaps, which make it difficult to implement forward hedges around our transportation and storage positions.  See “Financial Markets Legislation” for discussion of the Dodd-Frank Act.

SEGMENT FINANCIAL INFORMATION

Operating Income, Customers and Total Assets - See Note R of the Notes to Consolidated Financial Statements in this Annual Report for disclosure by segment of our operating income and total assets and for a discussion of revenues from external customers.

Other

Through ONEOK Leasing Company, L.L.C., and ONEOK Parking Company, L.L.C., we own a parking garage and an office building (ONEOK Plaza) in downtown Tulsa, Oklahoma, where our headquarters are located.  ONEOK Leasing Company, L.L.C., leases excess office space to others and operates our headquarters office building.  ONEOK Parking Company, L.L.C. owns and operates a parking garage adjacent to our headquarters.

FINANCIAL MARKETS LEGISLATION

The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets.  Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act.  Although the CFTC has issued final regulations for certain provisions of the Dodd-Frank Act, many remain outstanding.  In November 2011, the CFTC published final rules on speculative position limits, which we do not expect to impact directly our current risk-management practices.  In December 2011, the CFTC issued an order that further defers the effective date of the provisions of the Dodd-Frank Act that require a rulemaking, such as definitions of

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certain terms, until the earlier of the effective date of the final rule defining the reference terms or July 16, 2012.  Until the remaining final regulations are established, we are unable to ascertain how we may be affected by them.  Based on our assessment of the regulations issued to date and those proposed, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation.  We also may incur additional costs associated with our compliance with the new regulations and anticipated additional record keeping, reporting and disclosure obligations; however, we do not believe the costs will be material.  These requirements could affect adversely market liquidity and pricing of derivative contracts making it more difficult to execute our risk-management strategies in the future.  Also, the anticipated increased costs of compliance by dealers and counterparties likely will be passed on to customers, which could decrease the benefits of hedging to us and could reduce our profitability and liquidity.

ENVIRONMENTAL AND SAFETY MATTERS

Additional information about our environmental matters is included in Note Q of the Notes to Consolidated Financial Statements in this Annual Report.

Environmental Liabilities -We are subject to multiple historical and wildlife preservation laws and environmental regulations affecting many aspects of our present and future operations.  Regulated activities include those involving air emissions; storm water and wastewater discharges; handling and disposal of solid and hazardous wastes; hazardous materials transportation; and pipeline and facility construction.  These laws and regulations require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals.  Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations.  If a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including response, investigation and cleanup costs, which could affect materially our results of operations and cash flows.  In addition, emission controls required under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Pipeline Safety - We are subject to Pipeline and Hazardous Materials Safety Administration regulations, including integrity- management regulations.  The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas.  In January 2012, the Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011 was signed into law.  The new law contains numerous requirements for the Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us.  These issues include but are not limited to:

·   an evaluation on whether hazardous natural gas liquid and natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;

·   a review of all natural gas and hazardous natural gas liquid gathering pipeline exemptions;

·   a verification of records for pipelines in Class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and

·   a requirement to test pipelines previously untested in high-consequence areas operating above 30-percent yield strength.

The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.

Air and Water Emissions - The Clean Air Act, the Clean Water Act and analogous state laws impose restrictions and controls regarding the discharge of pollutants into the air and water in the United States.  Under the Clean Air Act, a federally enforceable operating permit is required for sources of significant air emissions.  We may be required to incur certain capital expenditures for air-pollution-control equipment in connection with obtaining or maintaining permits and approvals for sources of air emissions.  The Clean Water Act imposes substantial potential liability for the removal of pollutants discharged to waters of the United States and remediation of waters affected by such discharge.

Federal, state and regional initiatives to measure and regulate greenhouse gas emissions are under way.  We are monitoring federal and state legislation to assess the potential impact on our operations.  The EPA’s Mandatory Greenhouse Gas Reporting rule, released in September 2009, requires greenhouse gas emissions reporting for affected facilities on an annual

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basis and requires us to track the emission equivalents for the natural gas delivered by us to our distribution customers and emission equivalents for all NGLs delivered to customers of ONEOK Partners.  Our 2010 total reported emissions were less than 66.6 million metric tons of carbon dioxide equivalents.  This total includes direct emissions from the combustion of fuel in our equipment, such as compressor engines and heaters, and carbon dioxide equivalents from NGL products and natural gas delivered to customers, as if all such fuel and NGL products were combusted and carbon dioxide injected directly into disposal wells.  The next required reporting period for 2011 greenhouse gas emissions will be due March 31, 2012.  Also, the EPA released a subpart to the Mandatory Greenhouse Gas Reporting Rule that will require the reporting of vented and fugitive emissions of methane from our facilities.  The new requirements began in January 2011, with the first reporting of fugitive emissions due September 30, 2012.  We do not expect the cost to gather this emission data to have a material impact on our results of operations, financial position or cash flows.  In addition, Congress has considered, and may consider in the future, legislation to reduce greenhouse gas emissions, including carbon dioxide and methane.  At this time, no rule or legislation has been enacted that assesses any costs, fees or expenses on any of these emissions.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria.  Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions.  Since January 2011, the rule has been in the process of being phased in, and at current emission threshold levels, we believe it will have a minimal impact on our existing facilities.  The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities; however, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, with a compliance date in 2013.  The rule will require capital expenditures over the next two years for the purchase and installation of new emissions-control equipment.  We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

On July 28, 2011, the EPA issued a proposed rule package that would change the air emission New Source Performance Standards and Maximum Achievable Control Technology requirements applicable to natural gas production, processing, transmission and underground storage.  The proposed rules would impact emission limits for specific equipment through the use of controls; however, potential costs associated with the proposed rules currently are unknown.

Superfund - The Comprehensive Environmental Response, Compensation and Liability Act, also known as CERCLA or Superfund, imposes liability, without regard to fault or the legality of the original act, on certain classes of persons that contributed to the release of a hazardous substance into the environment.  These persons include the owner or operator of a facility where the release occurred and companies that disposed or arranged for the disposal of the hazardous substances found at the facility.  Under CERCLA, these persons may be liable for the costs of cleaning up the hazardous substances released into the environment, damages to natural resources and the costs of certain health studies.  In 2011, ONEOK Partners received notice from the EPA of potential liability for the U.S. Oil Recovery Superfund Site location in Harris County, Texas.  ONEOK Partners is named a potentially responsible party as a result of waste disposal at the now-abandoned site.  Neither we nor ONEOK Partners expect our respective current responsibilities under CERCLA, for this facility and any other, to have a material impact on our respective results of operations, financial position or cash flows.

Chemical Site Security - The United States Department of Homeland Security (Homeland Security) released an interim rule in April 2007 that requires companies to provide reports on sites where certain chemicals, including many hydrocarbon products, are stored.  We completed the Homeland Security assessments, and our facilities subsequently were assigned one of four risk-based tiers ranging from high (Tier 1) to low (Tier 4) risk, or not tiered at all due to low risk.  To date, four of our facilities have been given a Tier 4 rating.  Facilities receiving a Tier 4 rating are required to complete Site Security Plans and possible physical security enhancements.  We do not expect the Site Security Plans and possible security enhancements cost to have a material impact on our results of operations, financial position or cash flows.

Pipeline Security - Homeland Security’s Transportation Security Administration and the United States Department of Transportation have completed a review and inspection of our “critical facilities” and identified no material security issues.  Also, the Transportation Security Administration has released new pipeline security guidelines that include broader definitions for the determination of pipeline “critical facilities.”  We have reviewed our pipeline facilities according to the new guideline requirements and there have been no material changes required to date.

Environmental Footprint - Our environmental and climate change strategy focuses on taking steps to minimize the impact of our operations on the environment.  These strategies include:  (i) developing and maintaining an accurate greenhouse gas emissions inventory, according to current rules issued by the EPA; (ii) improving the efficiency of our various pipelines, natural gas processing facilities and natural gas liquids fractionation facilities; (iii) following developing technologies for emission control; and (iv) following developing technologies to capture carbon dioxide to keep it from reaching the atmosphere.

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ONEOK Partners participates in the EPA’s Natural Gas STAR Program to reduce voluntarily methane emissions.  We continue to focus on maintaining low rates of lost-and-unaccounted-for natural gas through expanded implementation of best practices to limit the release of natural gas during pipeline and facility maintenance and operations.  Our most recent calculation of our annual lost-and-unaccounted-for natural gas, for all of our business operations, is less than 1 percent of total throughput.

EMPLOYEES

We employed 4,795 people at January 31, 2012, including 694 people at Kansas Gas Service who are subject to collective bargaining contracts.  The following table sets forth our contracts with collective bargaining units at January 31, 2012:

Union	Employees	Contract Expires
The United Steelworkers	388	October 28, 2016
International Brotherhood of Electrical Workers (IBEW)	306	June 30, 2014

EXECUTIVE OFFICERS

All executive officers are elected annually by our Board of Directors, and each serves until such person resigns, is removed or is otherwise disqualified to serve, or until such officer’s successor is duly elected.  Our executive officers listed below include the officers who have been designated by our Board of Directors as our Section 16 executive officers.

Name and Position	Age	Business Experience in Past Five Years
John W. Gibson	59	2012 to present	Chairman and Chief Executive Officer, ONEOK and ONEOK Partners
Chairman and Chief Executive Officer		2011	Chairman, President and Chief Executive Officer, ONEOK
		2011	Vice Chairman of the Board of Directors, ONEOK
		2010 to 2011	President and Chief Executive Officer, ONEOK
		2010 to 2011	Chairman, President and Chief Executive Officer, ONEOK Partners
		2007 to 2009	Chief Executive Officer, ONEOK
		2007 to 2009	Chairman and Chief Executive Officer, ONEOK Partners
		2006 to present	Member of the Board of Directors, ONEOK and ONEOK Partners
Terry K. Spencer	52	2012 to present	President, ONEOK and ONEOK Partners
President		2010 to present	Member of the Board of Directors, ONEOK Partners
		2009 to 2011	Chief Operating Officer, ONEOK Partners
		2007 to 2009	Executive Vice President, Natural Gas Liquids, ONEOK Partners
Pierce H. Norton II	52	2012 to present	Executive Vice President and Chief Operating Officer, ONEOK and ONEOK Partners
Executive Vice President and		2011	Chief Operating Officer, ONEOK
Chief Operating Officer		2009 to 2011	President, ONEOK Distribution Companies, ONEOK
		2007 to 2009	Executive Vice President, Natural Gas, ONEOK Partners
		2006 to 2007	President, Gathering and Processing, ONEOK Partners
Robert F. Martinovich	54	2012 to present	Executive Vice President, Chief Financial Officer and Treasurer, ONEOK and ONEOK Partners
Executive Vice President, Chief Financial Officer		2011 to present	Member of the Board of Directors, ONEOK Partners
and Treasurer		2011	Senior Vice President, Chief Financial Officer and Treasurer, ONEOK and ONEOK Partners
		2009 to 2011	Chief Operating Officer, ONEOK
		2007 to 2009	President, Gathering and Processing, ONEOK Partners
		2006 to 2007	Group Vice President, EHS, Operations & Technical Services, DCP Midstream LLC
Stephen W. Lake	48	2012 to present	Senior Vice President, General Counsel and Assistant Secretary, ONEOK and ONEOK Partners
Senior Vice President, General Counsel and		2011	Senior Vice President, Associate General Counsel and Assistant Secretary, ONEOK and ONEOK Partners
Assistant Secretary		2008-2011	Executive Vice President and General Counsel, McJunkin Red Man Corporation
		1998-2008	Partner, GableGotwals
Derek S. Reiners	40	2009 to present	Senior Vice President and Chief Accounting Officer, ONEOK and ONEOK Partners
Senior Vice President and Chief Accounting Officer		2004 to 2009	Partner, Grant Thornton LLP

No family relationships exist between any of the executive officers, nor is there any arrangement or understanding between any executive officer and any other person pursuant to which the officer was selected.

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INFORMATION AVAILABLE ON OUR WEBSITE

We make available, free of charge, on our website (www.oneok.com) copies of our Annual Reports, Quarterly Reports, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC.  Copies of our Code of Business Conduct, Corporate Governance Guidelines and Director Independence Guidelines are also available on our website, and we will provide copies of these documents upon request.  Our website and any contents thereof are not incorporated by reference into this report.

We also make available on our website the Interactive Data Files required to be submitted and posted pursuant to Rule 405 of Regulation S-T.

ITEM 1A.                      RISK FACTORS

Our investors should consider the following risks that could affect us and our business.  Although we have tried to discuss key factors, our investors need to be aware that other risks may prove to be important in the future.  New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance.  Investors should carefully consider the following discussion of risks and the other information included or incorporated by reference in this Annual Report, including “Forward-Looking Statements,” which are included in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

RISK FACTORS INHERENT IN OUR BUSINESS

Market volatility and capital availability could affect adversely our business.

The capital and credit markets have experienced volatility and disruption in the past.  In many cases during these periods, the capital markets have exerted downward pressure on equity values and reduced the credit capacity for certain companies.  Our ability to grow could be constrained if we do not have regular access to the capital and credit markets.  Similar or more severe levels of market disruption and volatility may have an adverse affect on us resulting from, but not limited to, disruption of our access to capital and credit markets, difficulty in obtaining financing necessary to expand facilities or acquire assets, increased financing cost and increasingly restrictive covenants.

Our operating results may be affected materially and adversely by unfavorable economic and market conditions.

Economic conditions worldwide have from time to time contributed to slowdowns in the oil and natural gas industry, as well as in the specific segments and markets in which we operate, resulting in reduced demand and increased price competition for our products and services.  Our operating results in one or more geographic regions may also be affected by uncertain or changing economic conditions within that region.  Volatility in commodity prices may have an impact on many of our customers, which, in turn, could have a negative impact on their ability to meet their obligations to us.  If global economic and market conditions (including volatility in commodity markets), or economic conditions in the United States or other key markets, remain uncertain or persist, spread or deteriorate further, we may experience material impacts on our business, financial condition, results of operations and liquidity.

Our cash flow depends heavily on the earnings and distributions of ONEOK Partners.

Our partnership interest in ONEOK Partners is one of our largest cash-generating assets.  Therefore, our cash flow is heavily dependent upon the ability of ONEOK Partners to make distributions to its partners.  A significant decline in ONEOK Partners’ earnings and/or cash distributions would have a corresponding negative impact on us.  For information on the risk factors inherent in the business of ONEOK Partners, see the section below entitled “Additional Risk Factors Related to ONEOK Partners’ Business” and Item 1A, Risk Factors in the ONEOK Partners’ Annual Report.

Some of our nonregulated businesses have a higher level of risk than our regulated businesses.

Some of our nonregulated operations, which include ONEOK Partners’ natural gas gathering and processing business, most of its natural gas liquids business and our energy services business, have a higher level of risk than our regulated operations, which include the LDCs in our distribution business, ONEOK Partners’ natural gas pipelines business and a portion of its natural gas liquids business.  We and ONEOK Partners expect to continue investing in natural gas and natural gas liquids projects and other related projects, some or all of which may involve nonregulated businesses or assets.  These projects could involve risks associated with operational factors, such as competition and dependence on certain suppliers and customers, and

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financial, economic and political factors, such as rapid and significant changes in commodity prices, the cost and availability of capital and counterparty risk, including the inability of a counterparty, customer or supplier to fulfill a contractual obligation.

Our LDCs have recorded certain assets that may not be recoverable from our customers.

Accounting principles that govern our LDCs permit certain assets that result from the regulatory process to be recorded on our balance sheet that could not be recorded under GAAP for nonregulated entities.  We consider factors such as rate orders from regulators, previous rate orders for substantially similar costs, written approval from the regulators and analysis of recoverability from internal and external legal counsel to determine the probability of future recovery of these assets.  If we determine future recovery is no longer probable, we would be required to write off the regulatory assets at that time.

Terrorist attacks aimed at our facilities could affect adversely our business.

Since the September 11, 2001, terrorist attacks, the United States government has issued warnings that energy assets, specifically the nation’s pipeline infrastructure, may be future targets of terrorist organizations.  These developments may subject our operations to increased risks.  Any future terrorist attack that may target our facilities, those of our customers and, in some cases, those of other pipelines, could have a material adverse effect on our business.

Our businesses are subject to market and credit risks.

We are exposed to market and credit risks in all of our operations.  To minimize the risk of commodity price fluctuations, we periodically enter into derivative transactions to hedge anticipated purchases and sales of natural gas, NGLs, crude oil, fuel requirements and firm transportation commitments.  Interest-rate swaps are also used to manage interest-rate risk.  Currency forward contracts are used to mitigate unexpected changes that may occur in anticipated revenue streams of our Canadian natural gas sales and purchases driven by currency rate fluctuations.  However, financial derivative instrument contracts do not eliminate the risks.  Specifically, such risks include commodity price changes, market supply shortages, interest rate changes and counterparty default.  The impact of these variables could result in our inability to fulfill contractual obligations, significantly higher energy or fuel costs relative to corresponding sales contracts, or increased interest expense.

We are subject to the risk of loss resulting from nonpayment and/or nonperformance by customers and counterparties of our Energy Services segment.  The customers of our Energy Services segment are predominantly LDCs, industrial customers, natural gas producers and marketers that may experience deterioration of their financial condition as a result of changing market conditions or financial difficulties that could impact their creditworthiness or ability to pay for our services.  If we fail to assess adequately the creditworthiness of existing or future customers, unanticipated deterioration in their creditworthiness and any resulting nonpayment and/or nonperformance could adversely impact results of operations for our Energy Services segment.  In addition, if any of our Energy Services segment’s customers or counterparties filed for bankruptcy protection, we may not be able to recover amounts owed, which could impact materially and adversely the results of operations for our Energy Services segment.

Increased competition could have a significant adverse financial impact on us.

The natural gas and natural gas liquids industries are expected to remain highly competitive.  The demand for natural gas and NGLs is primarily a function of commodity prices, including prices for alternative energy sources, customer usage rates, weather, economic conditions and service costs.  Our ability to compete also depends on a number of other factors, including competition from other companies for our existing customers, the efficiency, quality and reliability of the services we provide, and competition for throughput at ONEOK Partners’ gathering systems, pipelines, processing plants, fractionators and storage facilities.

We cannot predict when we will be subject to changes in legislation or regulation, nor can we predict the impact of these changes on our financial position, results of operations or cash flows.  There are no assurances that our business will be positioned to effectively compete in the future.

We may not be able to make additional strategic acquisitions.

Our ability to make strategic acquisitions and investments will depend on: (i) the extent to which acquisitions and investment opportunities become available; (ii) our success in bidding for the opportunities that do become available; (iii) regulatory approval, if required, of the acquisitions on favorable terms; and (iv) our access to capital, including our ability to use our equity in acquisitions or investments, and the terms upon which we obtain capital.  If we are unable to make strategic investments and acquisitions, we may be unable to grow.

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Acquisitions that appear to be accretive may nevertheless reduce our cash from operations on a per-share basis.

Any acquisition involves potential risks that may include, among other things:

·   inaccurate assumptions about volumes, revenues and costs, including potential synergies;

·   an inability to integrate successfully the businesses we acquire;

·   decrease in our liquidity as a result of our using a significant portion of our available cash or borrowing capacity to finance the acquisition;

·   a significant increase in our interest expense or financial leverage if we incur additional debt to finance the acquisition;

·   the assumption of unknown liabilities for which we are not indemnified, our indemnity is inadequate or our insurance policies may exclude from coverage;

·   an inability to hire, train or retain qualified personnel to manage and operate the acquired business and assets;

·   limitations on rights to indemnity from the seller;

·   inaccurate assumptions about the overall costs of equity or debt;

·   the diversion of management’s and employees’ attention from other business concerns;

·   unforeseen difficulties operating in new product areas or new geographic areas; 

·   increased regulatory burdens;

·   customer or key employee losses at an acquired business; and

·   increased regulatory requirements.

If we consummate any future acquisitions, our capitalization and results of operations may change significantly, and investors will not have the opportunity to evaluate the economic, financial and other relevant information that we will consider in determining the application of our resources to future acquisitions.

We may engage in acquisitions, divestitures and other strategic transactions, the success of which may impact our results of operations.

We may engage in acquisitions, divestitures and other strategic transactions.  If we are unable to integrate successfully businesses that we acquire with our existing business, our results of operations may be affected materially and adversely.  Similarly, we may from time to time divest portions of our business, which may also affect materially and adversely our results of operations.

Any reduction in our credit ratings could affect materially and adversely our business, financial condition, liquidity and results of operations.

Our long-term senior unsecured debt has been assigned an investment-grade rating by S&P of “BBB” (Stable) and Moody’s of “Baa2” (Stable); however, we cannot provide assurance that any of our current ratings will remain in effect for any given period of time or that a rating will not be lowered or withdrawn entirely by a rating agency if, in its judgment, circumstances in the future so warrant.  Specifically, if S&P or Moody’s were to downgrade our long-term rating, particularly below investment grade, our borrowing costs would increase, which would affect adversely our financial results, and our potential pool of investors and funding sources could decrease.  Further, if our short-term ratings were to fall below A-2 or Prime-2, the current ratings assigned by S&P and Moody’s, respectively, it could limit significantly our access to the commercial paper market.  Any such downgrade of our long- or short-term ratings could increase significantly our cost of capital and reduce the availability of capital and, thus, have a material adverse effect on our business, financial condition, liquidity and results of operations.  Ratings from credit agencies are not recommendations to buy, sell or hold our securities.  Each rating should be evaluated independently of any other rating.

A downgrade in our credit ratings below investment grade would affect negatively the operations of our Energy Services segment.  If our credit ratings fall below investment grade, ratings triggers and/or adequate assurance clauses in many of our financial and wholesale physical contracts would be in effect.  A ratings trigger or adequate assurance clause gives a counterparty the right to suspend or terminate the agreement unless margin thresholds are met.  Margin requirements related to the trading activities of our Energy Services segment may also increase as a result of market volatility without regard to our credit rating.  The additional increase in capital required to support our Energy Services segment would impact materially and adversely our ability to compete, as well as our ability to manage actively the risk associated with existing storage and transportation contracts.

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Our established risk-management policies and procedures may not be effective, and employees may violate our risk management policies.

We have developed and implemented a comprehensive set of policies and procedures that involve both our senior management and the Audit Committee of our Board of Directors to assist us in managing risks associated with, among other things, the marketing, trading and risk-management activities associated with our business segments.  Our risk policies and procedures are intended to align strategies, processes, people, information technology and business knowledge so that risk is managed throughout the organization.  As conditions change and become more complex, current risk measures may fail to assess adequately the relevant risk due to changes in the market and the presence of risks previously unknown to us.  Additionally, if employees fail to adhere to our policies and procedures or if our policies and procedures are not effective, potentially because of future conditions or risks outside of our control, we may be exposed to greater risk than we had intended.  Ineffective risk-management policies and procedures or violation of risk-management policies and procedures could have an adverse affect on our earnings, financial position or cash flows.

Our indebtedness could impair our financial condition and our ability to fulfill our obligations.

As of December 31, 2011, we had total indebtedness for borrowed money of approximately $1.8 billion, which excludes the debt of ONEOK Partners.  Our indebtedness could have significant consequences.  For example, it could:

·   make it more difficult for us to satisfy our obligations with respect to our senior notes and our other indebtedness due to the increased debt-service obligations, which could, in turn, result in an event of default on such other indebtedness or our senior notes;

·   impair our ability to obtain additional financing in the future for working capital, capital expenditures, acquisitions or general business purposes;

·   diminish our ability to withstand a downturn in our business or the economy;

·   require us to dedicate a substantial portion of our cash flow from operations to debt-service payments, reducing the availability of cash for working capital, capital expenditures, acquisitions, or general corporate purposes;

·   limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate; and

·   place us at a competitive disadvantage compared with our competitors that have proportionately less debt.

We are not prohibited under the indentures governing our senior notes from incurring additional indebtedness, but our debt agreements do subject us to certain operational limitations summarized in the next paragraph.  If we incur significant additional indebtedness, it could worsen the negative consequences mentioned above and could affect adversely our ability to repay our other indebtedness.

Our revolving debt agreements with banks contain provisions that restrict our ability to finance future operations or capital needs or to expand or pursue our business activities.  For example, certain of these agreements contain provisions that, among other things, limit our ability to make loans or investments, make material changes to the nature of our business, merge, consolidate or engage in asset sales, grant liens, or make negative pledges.  Certain agreements also require us to maintain certain financial ratios, which limit the amount of additional indebtedness we can incur, as described in the “Liquidity and Capital Resources” section of Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation.  These restrictions could result in higher costs of borrowing and impair our ability to generate additional cash.  Future financing agreements we may enter into may contain similar or more restrictive covenants.

If we are unable to meet our debt-service obligations, we could be forced to restructure or refinance our indebtedness, seek additional equity capital or sell assets.  We may be unable to obtain financing or sell assets on satisfactory terms, or at all.

We are subject to comprehensive energy regulation by governmental agencies, and the recovery of our costs is dependent on regulatory action.

We are subject to comprehensive regulation by several federal, state and municipal utility regulatory agencies, which significantly influences our operating environment and our ability to recover our costs from utility customers.  The utility regulatory authorities in Oklahoma, Kansas and Texas regulate many aspects of our utility operations, including customer service and the rates that we can charge customers.  Federal, state and local agencies also have jurisdiction over many of our other activities, including regulation by the FERC of our storage and interstate pipeline assets.  The profitability of our regulated operations is dependent on our ability to pass through costs related to providing energy and other commodities to our customers by filing periodic rate cases.  The regulatory environment applicable to our regulated businesses could impair our ability to recover costs historically absorbed by our customers.

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We are unable to predict the impact that the future regulatory activities of these agencies will have on our operating results.  Changes in regulations or the imposition of additional regulations could have an adverse impact on our business, financial condition and results of operations.  Further, the results of our LDCs’ operations could be impacted negatively if the cost recovery mechanisms authorized by our rate cases do not function as anticipated.

The adoption and implementation of new statutory and regulatory requirements for derivative transactions could have an adverse impact on our ability to hedge risks associated with our business and increase the working capital requirements to conduct these activities.

In July 2010, the Dodd-Frank Act was enacted, which provides for new statutory and regulatory requirements for certain swap transactions.  Certain financial transactions will be required to be cleared on exchanges, and cash collateral will be required for these transactions.  However, the Dodd-Frank Act provides for a potential exemption from these clearing and cash collateral requirements for commercial end-users and includes a number of defined terms that will be used in determining how this exemption applies to particular derivative transactions and to the parties to those transactions. Additionally, the Dodd-Frank Act calls for various regulatory agencies, including the SEC and the CFTC, to establish regulations for implementation of many of the provisions of the act.  It also requires the CFTC to establish new position trading limits.

We expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation.  We may also incur additional costs associated with our compliance with the new regulations and anticipated additional record-keeping, reporting and disclosure obligations.  These requirements could affect adversely the liquidity and pricing of derivative contracts making it more difficult to execute our risk-management strategies in the future.  Also, the anticipated increased costs of compliance by dealers and counterparties will likely be passed on to customers, which could decrease the benefits of hedging to us and could reduce our profitability and liquidity.

The volatility of natural gas prices may impact negatively LDC customers’ perception of natural gas.

Natural gas costs are passed through to the customers of our LDCs based on the actual cost of the natural gas purchased by the particular LDC.  Substantial fluctuations in natural gas prices can occur from year to year.  Sustained periods of high natural gas prices or of pronounced natural gas price volatility may impact negatively our LDC customers’ perception of natural gas, which could lead to customers selecting other energy alternatives, such as electricity, and to difficulties in the rate-making process.  Additionally, high natural gas prices may cause customers to conserve more and may also impact adversely our accounts receivable collections, resulting in higher bad-debt expense.

Our business is subject to regulatory oversight and potential penalties.

The natural gas industry historically has been subject to heavy state and federal regulation that extends to many aspects of our businesses and operations, including:

·   rates, operating terms and conditions of service;

·   the types of services we may offer our customers;

·   construction of new facilities;

·   the integrity, safety and security of facilities and operations;

·   acquisition, extension or abandonment of services or facilities;

·   reporting and information posting requirements;

·   maintenance of accounts and records; and

·   relationships with affiliate companies involved in all aspects of the natural gas and energy businesses.

Compliance with these requirements can be costly and burdensome.  Future changes to laws, regulations and policies in these areas may impair our ability to compete for business or to recover costs and may increase the cost and burden of operations.

We cannot guarantee that state or federal regulators will authorize any projects or acquisitions that we may propose in the future.  Moreover, there can be no guarantee that, if granted, any such authorizations will be made in a timely manner or will be free from potentially burdensome conditions.

Failure to comply with all applicable state or federal statutes, rules and regulations and orders, could bring substantial penalties and fines.  For example, under the Energy Policy Act of 2005, the FERC has civil penalty authority under the Natural Gas Act to impose penalties for current violations of up to $1.0 million per day for each violation.

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Finally, we cannot give any assurance regarding future state or federal regulations under which we will operate or the effect such regulations could have on our business, financial condition and results of operations.

Demand for services of our Natural Gas Distribution and Energy Services segments and for certain of ONEOK Partners’ products is highly weather sensitive and seasonal.

The demand for natural gas in our Natural Gas Distribution, Energy Services and ONEOK Partners’ segments and for certain of ONEOK Partners’ products, such as propane, is weather sensitive and seasonal, with a significant portion of revenues derived from sales for heating during the winter months.  Weather conditions influence directly the volume of, among other things, natural gas and propane delivered to customers.  Deviations in weather from normal levels and the seasonal nature of certain of our segments’ business can create large variations in earnings and short-term cash requirements.

Compliance with environmental regulations that we are subject to may be difficult and costly.

We are subject to multiple environmental laws and regulations affecting many aspects of present and future operations, including air emissions, water quality, wastewater discharges, solid and hazardous wastes and hazardous material and substance management.  These laws and regulations generally require us to obtain and comply with a wide variety of environmental registrations, licenses, permits, inspections and other approvals.  Failure to comply with these laws, regulations, permits and licenses may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations.  If a leak or spill of hazardous substance occurs from our lines or facilities in the process of transporting natural gas or NGLs or at any facility that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including investigation and clean-up costs, which could affect materially our results of operations and cash flows.  In addition, emission controls required under the federal Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.  In addition, the EPA issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, with a compliance date in 2013.  The rule will require capital expenditures over the next three years for the purchase and installation of new emissions-control equipment.  We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions, particularly if those costs are not fully recoverable from customers, could have a material adverse effect on our business, financial condition and results of operations.  For further discussion on this topic, see Note Q of the Notes to Consolidated Financial Statements in this Annual Report.

We are subject to risks that could limit our access to capital, thereby increasing our costs and affecting adversely our results of operations.

We have grown rapidly in the past as a result of acquisitions.  Future acquisitions may require additional capital.  If we are not able to access capital at competitive rates, our strategy of enhancing the earnings potential of our existing assets, including through acquisitions of complementary assets or businesses, will be affected adversely.  A number of factors could affect adversely our ability to access capital, including: (i) general economic conditions; (ii) capital market conditions; (iii) market prices for natural gas, NGLs and other hydrocarbons; (iv) the overall health of the energy and related industries; (v) our ability to maintain our investment-grade credit ratings; and (vi) our capital structure.  Much of our business is capital intensive, and achievement of our long-term growth targets is dependent, at least in part, upon our ability to access capital at rates and on terms we determine to be attractive.  If our ability to access capital becomes constrained significantly, our interest costs will likely increase and our financial condition and future results of operations could be harmed significantly.

Energy efficiency and technological advances may affect the demand for natural gas and affect adversely our operating results.

The national trend toward increased conservation and technological advances, including installation of improved insulation and the development of more efficient furnaces and other heating devices, may decrease the demand for natural gas by residential customers.  More strict conservation measures in the future or technological advances in heating, conservation, energy generation or other devices could affect adversely our operations.

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The cost of providing pension and postretirement health care benefits to eligible employees and qualified retirees is subject to changes in pension fund values and changing demographics and may increase.

We have a defined benefit pension plan for certain employees and postretirement welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  The cost of providing these benefits to eligible current and former employees is subject to changes in the market value of our pension and postretirement benefit plan assets, changing demographics, including longer life expectancy of plan participants and their beneficiaries and changes in health care costs.  For further discussion of our defined benefit pension plan, see Note M of the Notes to Consolidated Financial Statements in this Annual Report.

Any sustained declines in equity markets and reductions in bond yields may have a material adverse effect on the value of our pension and postretirement benefit plan assets.  In these circumstances, additional cash contributions to our pension plans may be required.

Our business could be affected adversely by strikes or work stoppages by our unionized employees.

As of January 31, 2012, 694 of our 4,795 employees were represented by collective bargaining units under collective bargaining agreements.  We are involved periodically in discussions with collective bargaining units representing some of our employees to negotiate or renegotiate labor agreements.  We cannot predict the results of these negotiations, including whether any failure to reach new agreements will have a negative effect on our business, financial condition and results of operations or whether we will be able to reach any agreement with the collective bargaining units.  Any failure to reach agreement on new labor contracts might result in a work stoppage.  Any future work stoppage could, depending on the operations and the length of the work stoppage, have a material adverse effect on our business, financial condition and results of certain operations.

We may face significant costs to comply with the regulation of greenhouse gas emissions.

Greenhouse gas emissions originate primarily from combustion engine exhaust, heater exhaust and fugitive methane gas emissions.  Various federal and state legislative proposals have been introduced to regulate the emission of greenhouse gases, particularly carbon dioxide and methane, and the United States Supreme Court has ruled that carbon dioxide is a pollutant subject to regulation by the EPA.  In addition, there have been international efforts seeking legally binding reductions in emissions of greenhouse gases.

We believe it is possible that future governmental legislation and/or regulation may require us either to limit greenhouse gas emissions from our operations or to purchase allowances for such emissions that are actually attributable to our distribution customers or attributable to NGL customers of ONEOK Partners.  However, we cannot predict precisely what form these future regulations will take, the stringency of the regulations, or when they will become effective.  Several legislative bills have been introduced in the United States Congress that would require carbon dioxide emission reductions.  Previously considered proposals have included, among other things, limitations on the amount of greenhouse gases that can be emitted (so called “caps”) together with systems of emissions allowances.  This system could require us to reduce emissions, even though the technology is not currently available for efficient reduction, or to purchase allowances for such emissions.  Emissions also could be taxed independently of limits.

In addition to activities on the federal level, state and regional initiatives could also lead to the regulation of greenhouse gas emissions sooner and/or independent of federal regulation.  These regulations could be more stringent than any federal regulation or legislation that is adopted.

Future legislation and/or regulation designed to reduce greenhouse gas emissions could make some of our activities uneconomic to maintain or operate.  Further, we may not be able to pass on the higher costs to our customers or recover all costs related to complying with greenhouse gas regulatory requirements.  Our future results of operations, cash flows or financial condition could be adversely affected if such costs are not recovered through regulated rates or otherwise passed on to our customers.

We continue to monitor legislative and regulatory developments in this area.  Although the regulation of greenhouse gas emissions may have a material impact on our operations and rates, we are unable to quantify the potential costs of the impacts at this time.

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We do not hedge fully against commodity price changes, time differentials or locational differentials.  This could result in decreased revenues and increased costs, thereby resulting in lower margins and adversely affecting our results of operations.

Certain of our nonregulated and regulated businesses are exposed to market risk and the impact of market price fluctuations of natural gas, NGLs and crude oil.  Market risk refers to the risk of loss of cash flows and future earnings arising from adverse changes in commodity prices.  Our Energy Services segment’s primary exposures arise from seasonal and locational price differentials and our ability to execute hedges.  Our ONEOK Partners segment’s primary exposures arise from the value of the NGL and natural gas it receives in exchange for the natural gas gathering and processing services it provides; the differentials between commodity prices with respect to its keep-whole contracts and the differentials between NGL and natural gas prices and their impact on our natural gas and NGL transportation, fractionation and exchange throughputs; the differentials between the individual NGL products; differentials between NGL prices at different locations;  the seasonal differentials impacting the volume of natural gas and NGLs stored; and the fuel costs and the value of the retained fuel in-kind in ONEOK Partners’ natural gas pipelines and storage operations.  Our ONEOK Partners and Energy Services segments are also exposed to the risk of changing prices or the cost of transportation resulting from purchasing natural gas or NGLs at one location and selling it at another (referred to as basis risk).  To minimize the risk from market price fluctuations of natural gas, NGLs and crude oil, we use physical forward transactions and commodity derivative instruments such as futures contracts, swaps and options to manage market risk of existing or anticipated purchases and sales of natural gas, NGLs and crude oil.  We adhere to policies and procedures that monitor our exposure to market risk from open positions.  However, we do not hedge fully against commodity price changes, and therefore, we retain some exposure to market risk.  Accordingly, any adverse changes to commodity prices could result in decreased revenue and/or increased costs.

Our Natural Gas Distribution segment uses storage to minimize the volatility of natural gas costs for our customers by storing natural gas in periods of low demand for consumption in peak demand periods.  In addition, various natural gas supply contracts allow us the option to convert index-based purchases to fixed prices.  Also, we use derivative instruments to hedge the cost of anticipated natural gas purchases during the winter heating months to protect customers from upward volatility in the market price of natural gas.

Federal, state and local jurisdictions may challenge our tax return positions.

The positions taken in our federal and state tax return filings require significant judgments, use of estimates and the interpretation and application of complex tax laws.  Significant judgment is also required in assessing the timing and amounts of deductible and taxable items.  Despite management’s belief that our tax return positions are fully supportable, certain positions may be successfully challenged by federal, state and local jurisdictions.

Although we control ONEOK Partners, we may have conflicts of interest with ONEOK Partners that could subject us to claims that we have breached our fiduciary duty to ONEOK Partners and its unitholders.

We are the sole general partner and own 42.8 percent of ONEOK Partners.  Conflicts of interest may arise between us and ONEOK Partners and its unitholders.  In resolving these conflicts, we may favor our own interests and the interests of our affiliates over the interests of ONEOK Partners and its unitholders as long as the resolution does not conflict with the ONEOK Partners’ partnership agreement or our fiduciary duties to ONEOK Partners and its unitholders.

We are subject to physical and financial risks associated with climate change.

There is a growing belief that emissions of greenhouse gases may be linked to global climate change.  Climate change creates physical and financial risk.  Our customers’ energy needs vary with weather conditions, primarily temperature and humidity.  For residential customers, heating and cooling represent their largest energy use.  To the extent weather conditions may be affected by climate change, customers’ energy use could increase or decrease depending on the duration and magnitude of any changes.  Increased energy use due to weather changes may require us to invest in more pipelines and other infrastructure to serve increased demand.  A decrease in energy use due to weather changes may affect our financial condition, through decreased revenues.  Extreme weather conditions in general require more system backup, adding to costs, and can contribute to increased system stresses, including service interruptions.  Weather conditions outside of our operating territory could also have an impact on our revenues.  Severe weather impacts our operating territories primarily through hurricanes, thunderstorms, tornadoes and snow or ice storms.  To the extent the frequency of extreme weather events increases, this could increase our cost of providing service.  We may not be able to pass on the higher costs to our customers or recover all the costs related to mitigating these physical risks.  To the extent financial markets view climate change and emissions of greenhouse gases as a financial risk, this could affect negatively our ability to access capital markets or cause us to receive less favorable terms and conditions in future financings.  Our business could be affected by the potential for lawsuits against greenhouse gas emitters, based on links drawn between greenhouse gas emissions and climate change.

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Both our and ONEOK Partners’ operations are subject to operational hazards and unforeseen interruptions, which could affect materially and adversely our and ONEOK Partners’ business and for which neither we nor ONEOK Partners may be insured adequately.

Our and ONEOK Partners’ operations are subject to all of the risks and hazards typically associated with the operation of natural gas and natural gas liquids gathering, transportation and distribution pipelines, storage facilities and processing and fractionation plants.  Operating risks include, but are not limited to, leaks, pipeline ruptures, the breakdown or failure of equipment or processes, and the performance of pipeline facilities below expected levels of capacity and efficiency.  Other operational hazards and unforeseen interruptions include adverse weather conditions, accidents, explosions, fires, the collision of equipment with our or ONEOK Partners’ pipeline facilities (for example, this may occur if a third party were to perform excavation or construction work near our or ONEOK Partners’ facilities) and catastrophic events such as tornados, hurricanes, earthquakes, floods or other similar events beyond our or ONEOK Partners’ control.  It is also possible that our or ONEOK Partners’ facilities could be direct targets or indirect casualties of an act of terrorism.  A casualty occurrence might result in injury or loss of life, extensive property damage or environmental damage.  Liabilities incurred and interruptions to the operations of our or ONEOK Partners’ pipelines or other facilities caused by such an event could reduce revenues generated by us or ONEOK Partners and increase expenses, thereby impairing our or ONEOK Partners’ ability to meet our respective obligations.  Insurance proceeds may not be adequate to cover all liabilities or expenses incurred or revenues lost, and neither we nor ONEOK Partners are fully insured against all risks inherent in our respective businesses.

As a result of market conditions, premiums and deductibles for certain insurance policies can increase substantially, and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage.  Consequently, neither we nor ONEOK Partners may be able to renew existing insurance policies or purchase other desirable insurance on commercially reasonable terms, if at all.  If either we or ONEOK Partners were to incur a significant liability for which either we or ONEOK Partners was not insured fully, it could have a material adverse effect on our or ONEOK Partners’ financial position and results of operations.  Further, the proceeds of any such insurance may not be paid in a timely manner and may be insufficient if such an event were to occur.

Our use of financial instruments to hedge market risk may result in reduced income.

We utilize financial instruments to mitigate our exposure to commodity price and interest-rate fluctuations.  Hedging arrangements that are used to reduce our exposure to commodity price fluctuations may limit the benefit we would otherwise receive if market prices for natural gas, crude oil and NGLs exceed the stated price in the hedge instrument for these commodities.  Hedging instruments that are used to reduce our exposure to interest-rate fluctuations could expose us to risk of financial loss where we have contracted for variable-rate swap instruments to hedge fixed-rate instruments and the variable rate exceeds the fixed rate.  In addition, these hedging arrangements may limit the benefit we would otherwise receive if we had contracted for fixed-rate swap agreements to hedge variable-rate instruments and the variable rate falls below the fixed rate.

A failure in our operational systems or cyber security attacks on any of our facilities, or those of third parties, may affect adversely our financial results.

Our businesses are dependent upon our operational systems to process a large amount of data and complex transactions.  If any of our financial, operational, or other data processing systems fail or have other significant shortcomings, our financial results could be affected adversely.  Our financial results could also be affected adversely if an employee causes our operational systems to fail, either as a result of inadvertent error or by deliberately tampering with or manipulating our operational systems.  In addition, dependence upon automated systems may further increase the risk that operational system flaws, employee tampering or manipulation of those systems will result in losses that are difficult to detect.

Due to increased technology advances, we have become more reliant on technology to help increase efficiency in our businesses.  We use computer programs to help run our financial and operations sectors, and this may subject our business to increased risks.  Any future cyber security attacks that affect our facilities, our customers and any financial data could have a material adverse on our businesses.  In addition, cyber attacks on our customer and employee data may result in a financial loss and may impact negatively our reputation.

Third-party systems on which we rely could also suffer operational system failure.  Any of these occurrences could disrupt one or more of our businesses, result in potential liability or reputational damage or otherwise have an adverse affect on our financial results.

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Increases in interest rates could affect adversely our business.

We use both fixed- and variable-rate debt, and we are exposed to market risk due to the floating interest rates on our short-term borrowings.  From time to time we use interest-rate derivatives to hedge interest obligations on specific debt issuances, including anticipated debt issuances.  These hedges may be ineffective, and our results of operations, cash flows and financial position could be affected adversely by significant increases in interest rates above current levels.

We do not own all of the land on which our pipelines and facilities are located, and we lease certain facilities and equipment, which could disrupt our operations.

We do not own all of the land on which certain of our pipelines and facilities are located, and are, therefore, subject to the risk of increased costs to maintain necessary land use.  We obtain the rights to construct and operate certain of our pipelines and related facilities on land owned by third parties and governmental agencies for a specific period of time.  Our loss of these rights, through our inability to renew right-of-way contracts on acceptable terms or increased costs to renew such rights, could have a material adverse effect on our financial condition, results of operations and cash flows.

A shortage of skilled labor may make it difficult for us to maintain labor productivity and competitive costs, which could affect operations and cash flows available for distribution.

Our operations require skilled and experienced workers with proficiency in multiple tasks.  In recent years, a shortage of workers trained in various skills associated with the midstream energy business has caused us to conduct certain operations without full staff, thus hiring outside resources, which may decrease productivity and increase costs.  This shortage of trained workers is the result of experienced workers reaching retirement age, and increased competition for workers in certain areas, combined with the difficulty of attracting new workers to the midstream energy industry.  This shortage of skilled labor could continue over an extended period.  If the shortage of experienced labor continues or worsens, it could have an adverse impact on labor productivity and costs and our ability to expand production in the event there is an increase in the demand for our products and services, which could adversely affect operations and cash flows available for distribution to unitholders.

Pipeline-integrity programs and repairs may impose significant costs and liabilities.

Pursuant to a United States Department of Transportation rule, pipeline operators are required to develop integrity-management programs for intrastate and interstate natural gas and natural gas liquids pipelines that could affect high-consequence areas in the event of a release of product.  As defined by applicable regulations, high-consequence areas include areas near the route of a pipeline with high population densities, facilities occupied by persons of limited mobility or indoor or outdoor areas where at least twenty people gather periodically.  The rule requires operators to identify to pipeline segments that could impact a high-consequence area; improve data collection, integration and characterization of threats applicable to each segment, implement preventive and mitigating actions, perform ongoing assessments of pipeline integrity and repair and remediate as necessary.  These testing programs could cause us and ONEOK Partners to incur significant capital and operating expenditures to make repairs or remediate, as well as initiate preventive or mitigating actions that are determined to be necessary.

We are subject to strict regulations at many of our facilities regarding employee safety, and failure to comply with these regulations could affect adversely financial results.

The workplaces associated with our facilities are subject to the requirements of OSHA and comparable state statutes that regulate the protection of the health and safety of workers.  The failure to comply with OSHA requirements or general industry standards, including keeping adequate records or occupational exposure to regulated substances could expose us to civil or criminal liability, enforcement actions, and regulatory fines and penalties and could have a material adverse effect on our business, financial position, results of operations and cash flow.

Measurement adjustments on our pipeline system can be impacted materially by changes in estimation, type of commodity and other factors.

Natural gas and natural gas liquids measurement adjustments occur as part of the normal operating conditions associated with our assets.  The quantification and resolution of measurement adjustments are complicated by several factors including: (1) the significant quantities (i.e., thousands) of measurement meters that we use throughout our natural gas systems; (2) varying qualities of natural gas in the streams gathered and processed and the mixed nature of NGLs gathered and fractionated through ONEOK Partners’ systems; and (3) variances in measurement that are inherent in metering technologies.  Each of these factors may contribute to measurement adjustments that can occur on our systems, which could affect negatively our earnings and cash flows.

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ADDITIONAL RISK FACTORS RELATED TO ONEOK PARTNERS’ BUSINESS

The volatility of natural gas, crude oil and NGL prices could affect adversely ONEOK Partners’ cash flow.

A significant portion of ONEOK Partners’ revenues are derived from the sale of commodities that are received as payment for natural gas gathering and processing services, for the transportation and storage of natural gas, and for the sale of purity NGL products in ONEOK Partners’ natural gas liquids business.  Commodity prices have been volatile and are likely to continue to be so in the future.  The prices ONEOK Partners receives for its commodities are subject to wide fluctuations in response to a variety of factors beyond ONEOK Partners’ control, including, but not limited to, the following:

·   overall domestic and global economic conditions;

·   relatively minor changes in the supply of, and demand for, domestic and foreign energy;

·   market uncertainty;

·   the availability and cost of third-party transportation, natural gas processing and natural gas liquids fractionation capacity;

·   the level of consumer product demand;

·   geopolitical conditions impacting supply and demand for natural gas, NGLs and crude oil;

·   weather conditions;

·   domestic and foreign governmental regulations and taxes;

·   the price and availability of alternative fuels;

·   speculation in the commodity futures markets;

·   overall domestic and global economic conditions;

·   the price of natural gas, crude oil, NGL and liquefied natural gas imports and exports;

·   the effect of worldwide energy conservation measures; and

·   the impact of new supplies, new pipelines, processing and fractionation facilities on location price differentials.

These external factors and the volatile nature of the energy markets make it difficult to estimate reliably future prices of commodities and the impact commodity price fluctuations have on our customers and their need for our services.  As commodity prices decline, ONEOK Partners is paid less for its commodities, thereby reducing its cash flow.  In addition, production could also decline.

ONEOK Partners’ inability to develop and execute growth projects and acquire new assets could result in reduced cash distributions to its unitholders and to ONEOK.

ONEOK Partners’ primary business objectives are to generate cash flow sufficient to pay quarterly cash distributions to unitholders and to increase quarterly cash distributions over time.  ONEOK Partners’ ability to maintain and grow its distributions to unitholders, including ONEOK, depends on the growth of its existing businesses and strategic acquisitions.  Accordingly, if ONEOK Partners is unable to implement business development opportunities and finance such activities on economically acceptable terms, its future growth will be limited, which could adversely impact its and our results of operations and cash flows.

Growing ONEOK Partners’ business by constructing new pipelines and plants or making modifications to its existing facilities subjects ONEOK Partners to construction risks and supply risks should adequate natural gas or NGL supplies be unavailable upon completion of the facilities.

One of the ways ONEOK Partners intends to grow its business is through the construction of new pipelines and new gathering, processing, storage and fractionation facilities and through modifications to ONEOK Partners’ existing pipelines and existing gathering, processing, storage and fractionation facilities.  The construction and modification of pipelines and gathering, processing, storage and fractionation facilities may require significant capital expenditures, which may exceed ONEOK Partners’ estimates, and involves numerous regulatory, environmental, political, legal and weather-related uncertainties.  Construction projects in ONEOK Partners’ industry may increase demand for labor, materials and rights of way, which, may, in turn, impact ONEOK Partners’ costs and schedule.  If ONEOK Partners undertakes these projects, it may not be able to complete them on schedule or at the budgeted cost.  Additionally, ONEOK Partners’ revenues may not increase immediately upon the expenditure of funds on a particular project.  For instance, if ONEOK Partners builds a new pipeline, the construction will occur over an extended period of time, and ONEOK Partners will not receive any material increases in revenues until after completion of the project.  ONEOK Partners may have only limited natural gas or NGL supplies committed to these facilities prior to their construction.  Additionally, ONEOK Partners may construct facilities to capture anticipated future growth in production in a region in which anticipated production growth does not materialize.  ONEOK Partners may also rely on estimates of proved reserves in its decision to construct new pipelines and facilities, which

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may prove to be inaccurate because there are numerous uncertainties inherent in estimating quantities of proved reserves.  As a result, new facilities may not be able to attract enough natural gas or NGLs to achieve ONEOK Partners’ expected investment return, which could affect materially and adversely ONEOK Partners’ results of operations and financial condition.

If the level of drilling and production in the Mid-Continent, Rocky Mountain, Texas and Gulf Coast regions declines substantially near its assets, ONEOK Partners’ volumes and revenue could decline.

ONEOK Partners’ ability to maintain or expand its businesses depends largely on the level of drilling and production by third parties in the Mid-Continent, Rocky Mountain, Texas and Gulf Coast regions.  Drilling and production are impacted by factors beyond ONEOK Partners’ control, including:

·   demand and prices for natural gas, NGLs and crude oil;

·   producers’ finding and developing costs of reserves;

·   producers’ desire and ability to obtain necessary permits in a timely and economic manner;

·   natural gas field characteristics and production performance;

·   surface access and infrastructure issues; and

·   capacity constraints on natural gas, crude oil and natural gas liquids pipelines from the producing areas and ONEOK Partners’ facilities.

If production from the Western Canada Sedimentary Basin remains flat or declines, and demand for natural gas from the Western Canada Sedimentary Basin is greater in market areas other than the Midwestern United States, demand for ONEOK Partners’ interstate gas transportation services could decrease significantly.

ONEOK Partners depends on natural gas supply from the Western Canada Sedimentary Basin for some of ONEOK Partners’ interstate pipelines, primarily Viking Gas Transmission and ONEOK Partners’ investment in Northern Border Pipeline, that transport Canadian natural gas from the Western Canada Sedimentary Basin to the Midwestern United States market area.  If demand for natural gas increases in Canada or other markets not served by ONEOK Partners’ interstate pipelines and/or production remains flat or declines, demand for transportation service on ONEOK Partners’ interstate natural gas pipelines could decrease significantly, which could impact adversely ONEOK Partners’ results of operations and cash flows available for distributions.

ONEOK Partners’ regulated pipelines’ transportation rates are subject to review and possible adjustment by federal and state regulators.

Under the Natural Gas Act, which is applicable to interstate natural gas pipelines, and the Interstate Commerce Act, which is applicable to crude oil and natural gas liquids pipelines, ONEOK Partners’ interstate transportation rates, which are regulated by the FERC, must be just and reasonable and not unduly discriminatory.

Shippers may protest ONEOK Partners’ pipeline tariff filings, and the FERC and/or state regulatory agencies may investigate tariff rates.  Further, the FERC may order refunds of amounts collected under newly filed rates that are determined by the FERC to be in excess of a just and reasonable level. In addition, shippers may challenge by complaint the lawfulness of tariff rates that have become final and effective.  The FERC and/or state regulatory agencies may also investigate tariff rates absent shipper complaint.  Any finding that approved rates exceed a just and reasonable level on the natural gas pipelines would take effect prospectively.  In a complaint proceeding challenging natural gas liquids pipeline rates, if the FERC determines existing rates exceed a just and reasonable level, it could require the payment of reparations to complaining shippers for up to two years prior to the complaint.  Any such action by the FERC or a comparable action by a state regulatory agency could affect adversely ONEOK Partners’ pipeline businesses’ ability to charge rates that would cover future increases in costs, or even to continue to collect rates that cover current costs and provide for a reasonable return.  We can provide no assurance that ONEOK Partners’ pipeline systems will be able to recover all of their costs through existing or future rates.

ONEOK Partners’ regulated pipeline companies have recorded certain assets that may not be recoverable from its customers.

Accounting policies for FERC-regulated companies permit certain assets that result from the regulated ratemaking process to be recorded on ONEOK Partners’ balance sheet that could not be recorded under GAAP for nonregulated entities.  ONEOK Partners considers factors such as regulatory changes and the impact of competition to determine the probability of future recovery of these assets.  If ONEOK Partners determines future recovery is no longer probable, ONEOK Partners would be required to write off the regulatory assets at that time.

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ONEOK Partners’ operations are subject to federal and state laws and regulations relating to the protection of the environment, which may expose it to significant costs and liabilities.

The risk of incurring substantial environmental costs and liabilities is inherent in ONEOK Partners’ business.  ONEOK Partners’ operations are subject to extensive federal, state and local laws and regulations governing the discharge of materials into, or otherwise relating to the protection of, the environment.  Examples of these laws include:

·   the Clean Air Act and analogous state laws that impose obligations related to air emissions;

·   the Clean Water Act and analogous state laws that regulate discharge of waste water from ONEOK Partners’ facilities to state and federal waters;

·   the federal CERCLA and analogous state laws that regulate the cleanup of hazardous substances that may have been released at properties currently or previously owned or operated by ONEOK Partners or locations to which ONEOK Partners has sent waste for disposal;

·   the federal Resource Conservation and Recovery Act and analogous state laws that impose requirements for the handling and discharge of solid and hazardous waste from ONEOK Partners’ facilities; and

·   the EPA has issued a rule on air-quality standards, known as RICE NESHAP, with a compliance date in 2013.

Various federal and state governmental authorities, including the EPA, have the power to enforce compliance with these laws and regulations and the permits issued under them.  Violators are subject to administrative, civil and criminal penalties, including civil fines, injunctions or both.  Joint and several, strict liability may be incurred without regard to fault under the CERCLA, Resource Conservation and Recovery Act and analogous state laws for the remediation of contaminated areas.

There is an inherent risk of incurring environmental costs and liabilities in ONEOK Partners’ business due to its handling of the products it gathers, transports, processes and stores, air emissions related to its operations, past industry operations and waste disposal practices, some of which may be material.  Private parties, including the owners of properties through which ONEOK Partners’ pipeline systems pass, may have the right to pursue legal actions to enforce compliance as well as to seek damages for noncompliance with environmental laws and regulations or for personal injury or property damage arising from ONEOK Partners’ operations.  Some sites ONEOK Partners operates are located near current or former third-party hydrocarbon storage and processing operations, and there is a risk that contamination has migrated from those sites to ONEOK Partners’ sites.  In addition, increasingly strict laws, regulations and enforcement policies could increase significantly ONEOK Partners’ compliance costs and the cost of any remediation that may become necessary, some of which may be material.  Additional information is included under Item 1, Business under “Environmental and Safety Matters” and in Note Q of the Notes to Consolidated Financial Statements in this Annual Report.

ONEOK Partners’ insurance may not cover all environmental risks and costs or may not provide sufficient coverage in the event an environmental claim is made against ONEOK Partners.  ONEOK Partners’ business may be affected materially and adversely by increased costs due to stricter pollution-control requirements or liabilities resulting from noncompliance with required operating or other regulatory permits.  New environmental regulations might also materially adversely affect ONEOK Partners’ products and activities, and federal and state agencies could impose additional safety requirements, all of which could affect materially ONEOK Partners’ profitability.

In the competition for customers, ONEOK Partners may have significant levels of uncontracted or discounted capacity on its natural gas and natural gas liquids pipelines, processing, fractionation and storage assets.

ONEOK Partners’ natural gas and natural gas liquids pipelines, processing, fractionation and storage assets compete with other pipelines, processing, fractionation and storage facilities for natural gas and NGL supplies delivered to the markets it serves.  As a result of competition, at any given time ONEOK Partners may have significant levels of uncontracted or discounted capacity on its pipelines, processing, fractionation and in its storage assets, which could have a material adverse impact on ONEOK Partners’ results of operations.

ONEOK Partners is exposed to the credit risk of its customers or counterparties, and its credit risk management may not be adequate to protect against such risk.

ONEOK Partners is subject to the risk of loss resulting from nonpayment and/or nonperformance by ONEOK Partners’ customers or counterparties.  ONEOK Partners’ customers or counterparties may experience rapid deterioration of their financial condition as a result of changing market conditions or financial difficulties that could impact their creditworthiness or ability to pay ONEOK Partners for its services.  ONEOK Partners assesses the creditworthiness of its customers or counterparties and obtains collateral as it deems appropriate.  If ONEOK Partners fails to assess adequately the creditworthiness of existing or future customers or counterparties, unanticipated deterioration in their creditworthiness and any resulting nonpayment and/or nonperformance could adversely impact ONEOK Partners’ results of operations.  In

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addition, if any of ONEOK Partners’ customers or counterparties files for bankruptcy protection, this could have a material negative impact on ONEOK Partners’ results of operations.

Any reduction in ONEOK Partners’ credit ratings could affect materially and adversely its business, financial condition, liquidity and results of operations.

ONEOK Partners’ senior unsecured long-term debt has been assigned an investment-grade rating by Moody’s of “Baa2” (Stable) and by S&P of “BBB” (Stable); however, we cannot provide assurance that any of its current ratings will remain in effect for any given period of time or that a rating will not be lowered or withdrawn entirely by a rating agency if, in its judgment, circumstances in the future so warrant.  Specifically, if Moody’s or S&P were to downgrade ONEOK Partners’ long-term debt rating, particularly below investment grade, its borrowing costs would increase, which would affect adversely its financial results, and its potential pool of investors and funding sources could decrease.  Ratings from credit agencies are not recommendations to buy, sell or hold ONEOK Partners’ securities.  Each rating should be evaluated independently of any other rating.

An event of default may require ONEOK Partners to offer to repurchase certain of its senior notes or may impair its ability to access capital.

The indentures governing ONEOK Partners’ senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners’ outstanding senior notes to declare those senior notes immediately due and payable in full.  ONEOK Partners may not have sufficient cash on hand to repurchase and repay any accelerated senior notes, which may cause ONEOK Partners to borrow money under its credit facilities or seek alternative financing sources to finance the repurchases and repayment.  ONEOK Partners could also face difficulties accessing capital or its borrowing costs could increase, impacting its ability to obtain financing for acquisitions or capital expenditures, to refinance indebtedness and to fulfill its debt obligations.

ONEOK Partners has adopted certain valuation methodologies that may result in a shift of income, gain, loss and deduction between the general partner and the unitholders.  The IRS may challenge this treatment, which could adversely affect the value of its limited partner units.

When ONEOK Partners issues additional units or engages in certain other transactions, ONEOK Partners determines the fair market value of its assets and allocates any unrealized gain or loss attributable to its assets to the capital accounts of its unitholders and its general partner.  ONEOK Partners’ methodology may be viewed as understating the value of its assets.  In that case, there may be a shift of income, gain, loss and deduction between certain unitholders and the general partner, which may be unfavorable to such unitholders.  Moreover, under ONEOK Partners’ current valuation methods, subsequent purchasers of common units may have a greater portion of their Internal Revenue Code Section 743(b) adjustment allocated to ONEOK Partners’ tangible assets and a lesser portion allocated to ONEOK Partners’ intangible assets.  The IRS may challenge ONEOK Partners’ valuation methods or ONEOK Partners’ allocation of the Section 743(b) adjustment attributable to ONEOK Partners’ tangible and intangible assets, and allocations of income, gain, loss and deduction between the general partner and certain of ONEOK Partners’ unitholders.

A successful IRS challenge to these methods or allocations could affect adversely the amount of taxable income or loss being allocated to ONEOK Partners’ unitholders.  It also could affect the amount of gain from ONEOK Partners unitholders’ sale of common units and could have a negative impact on the value of the common units or result in audit adjustments to ONEOK Partners unitholders’ tax returns without the benefit of additional deductions.

ONEOK Partners’ treatment of a purchaser of common units as having the same tax benefits as the seller could be challenged, resulting in a reduction in value of the common units.

Because ONEOK Partners cannot match transferors and transferees of common units, ONEOK Partners is required to maintain the uniformity of the economic and tax characteristics of these units in the hands of the purchasers and sellers of these units.  ONEOK Partners does so by adopting certain depreciation conventions that do not conform to all aspects of existing United States Treasury regulations.  A successful IRS challenge to these conventions could affect adversely the tax benefits to a unitholder of ownership of the common units and could have a negative impact on their value or result in audit adjustments to ONEOK Partners unitholders’ tax returns.

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Increased regulation of exploration and production activities, including hydraulic fracturing, could result in reductions or delays in drilling and completing new oil and natural gas wells, which could impact adversely ONEOK Partners’ revenues by decreasing the volumes of unprocessed natural gas transported on its or its joint ventures natural gas pipelines.

The natural gas industry is relying increasingly on natural gas supplies from unconventional sources, such as shale, tight sands and coal-bed methane gas.  Natural gas extracted from these sources frequently requires hydraulic fracturing, which involves the pressurized injection of water, sand, and chemicals into the geologic formation to stimulate natural gas production.  Recently, there have been initiatives at the federal and state levels to regulate or otherwise restrict the use of hydraulic fracturing, and several states have adopted regulations that impose more stringent permitting, disclosure and well-completion requirements on hydraulic fracturing operations.  Legislation or regulations placing restrictions on hydraulic fracturing activities could impose operational delays, increased operating costs and additional regulatory burdens on exploration and production operators, which could reduce their production of unprocessed natural gas and, in turn, adversely affect ONEOK Partners’ revenues and results of operations by decreasing the volumes of unprocessed natural gas gathered, treated, processed and transported on ONEOK Partners’ or its joint ventures’ natural gas pipelines, several of which gather unprocessed natural gas from areas where the use of hydraulic fracturing is prevalent.

Continued development of new supply sources could impact demand.

The discovery of nontraditional natural gas production areas nearer to certain of the market areas that we serve may compete with natural gas originating in production areas connected to our systems.  For example, the Marcellus Shale in Pennsylvania, New York, West Virginia and Ohio, may cause natural gas in supply areas connected to our systems to be diverted to markets other than our traditional market areas and may affect capacity utilization adversely on our pipeline systems and our ability to renew or replace existing contracts at rates sufficient to maintain current revenues and cash flows.  In addition, supply volumes from these nontraditional natural gas production areas may compete with and displace volumes from the Mid-Continent, Rocky Mountains and Canadian supply sources in certain of our markets.  The displacement of natural gas originating in supply areas connected to our pipeline systems by these new supply sources that are closer to the end-use markets could result in lower transportation revenues, which could have a material adverse impact on our business, financial condition, results of operations and cash flows.

An impairment of goodwill, long-lived assets, including intangible assets, and equity-method investments could reduce our earnings.

Goodwill is recorded when the purchase price of a business exceeds the fair market value of the tangible and separately measurable intangible net assets. GAAP require us to test goodwill and intangible assets with indefinite useful lives for impairment on an annual basis or when events or circumstances occur indicating that goodwill might be impaired.  Long-lived assets, including intangible assets with finite useful lives, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.  For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary.  If we determine that an impairment is indicated, we would be required to take an immediate noncash charge to earnings with a correlative effect on equity and balance sheet leverage as measured by debt to total capitalization.

A court may use fraudulent conveyance considerations to avoid or subordinate ONEOK Partners Intermediate Limited Partnership’s guarantee of certain of ONEOK Partners’ senior notes.

Various applicable fraudulent conveyance laws have been enacted for the protection of creditors.  A court may use fraudulent conveyance laws to subordinate or avoid the guarantee of certain of ONEOK Partners’ senior notes issued by ONEOK Partners Intermediate Limited Partnership.  It is also possible that under certain circumstances, a court could hold that the direct obligations of the Intermediate Partnership could be superior to the obligations under that guarantee.

A court could avoid or subordinate the Intermediate Partnership’s guarantee of certain of ONEOK Partners’ senior notes in favor of the Intermediate Partnership’s other debts or liabilities to the extent that the court determined either of the following were true at the time the Intermediate Partnership issued the guarantee:

·   the Intermediate Partnership incurred the guarantee with the intent to hinder, delay or defraud any of its present or future creditors or the Intermediate Partnership contemplated insolvency with a design to favor one or more creditors to the total or partial exclusion of others; or

·   the Intermediate Partnership did not receive fair consideration or reasonable equivalent value for issuing the guarantee and, at the time it issued the guarantee, the Intermediate Partnership:

-   was insolvent or rendered insolvent by reason of the issuance of the guarantee;

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-   was engaged or about to engage in a business or transaction for which its remaining assets constituted unreasonably small capital; or

-   intended to incur, or believed that it would incur, debts beyond its ability to pay such debts as they matured.

The measure of insolvency for purposes of the foregoing will vary depending upon the law of the relevant jurisdiction. Generally, however, an entity would be considered insolvent for purposes of the foregoing if:

·   the sum of its debts, including contingent liabilities, were greater than the fair saleable value of all of its assets at a fair valuation;

·   the present fair saleable value of its assets was less than the amount that would be required to pay its probable liability on its existing debts, including contingent liabilities, as they become absolute and mature; or

·   it could not pay its debts as they become due.

Among other things, a legal challenge of the Intermediate Partnership’s guarantee of certain of ONEOK Partners’ senior notes on fraudulent conveyance grounds may focus on the benefits, if any, realized by the Intermediate Partnership as a result of ONEOK Partners’ issuance of such senior notes.  To the extent the Intermediate Partnership’s guarantee of certain of ONEOK Partners’ senior notes is avoided as a result of fraudulent conveyance or held unenforceable for any other reason, the holders of such senior notes would cease to have any claim in respect of the guarantee.

ONEOK Partners may be unable to cause its joint ventures to take or not to take certain actions unless some or all of its joint-venture participants agree.

ONEOK Partners participates in several joint ventures.  Due to the nature of some of these arrangements, each participant in these joint ventures has made substantial investments in the joint venture and, accordingly, has required that the relevant charter documents contain certain features designed to provide each participant with the opportunity to participate in the management of the joint venture and to protect its investment, as well as any other assets which may be substantially dependent on or otherwise affected by the activities of that joint venture.  These participation and protective features customarily include a corporate governance structure that requires at least a majority-in-interest vote to authorize many basic activities and requires a greater voting interest (sometimes up to 100 percent) to authorize more significant activities.  Examples of these more significant activities are large expenditures or contractual commitments, the construction or acquisition of assets, borrowing money or otherwise raising capital, transactions with affiliates of a joint-venture participant, litigation and transactions not in the ordinary course of business, among others.  Thus, without the concurrence of joint-venture participants with enough voting interests, ONEOK Partners may be unable to cause any of its joint ventures to take or not to take certain actions, even though those actions may be in the best interest of ONEOK Partners or the particular joint venture.

Moreover, any joint-venture owner generally may sell, transfer or otherwise modify its ownership interest in a joint venture, whether in a transaction involving third parties or the other joint-venture owners.  Any such transaction could result in ONEOK Partners being required to partner with different or additional parties.

ONEOK Partners’ operating cash flow is derived partially from cash distributions it receives from its unconsolidated affiliates.

ONEOK Partners’ operating cash flow is derived partially from cash distributions it receives from its unconsolidated affiliates, as discussed in Note O of the Notes to Consolidated Financial Statements.  The amount of cash that ONEOK Partners’ unconsolidated affiliates can distribute principally depends upon the amount of cash flow these affiliates generate from their respective operations, which may fluctuate from quarter to quarter.  ONEOK Partners does not have any direct control over the cash distribution policies of its unconsolidated affiliates.  This lack of control may contribute to ONEOK Partners’ not having sufficient available cash each quarter to continue paying distributions at its current levels.

Additionally, the amount of cash that ONEOK Partners has available for cash distribution depends primarily upon its cash flow, including cash flow from financial reserves and working capital borrowings, and is not solely a function of profitability, which will be affected by noncash items such as depreciation, amortization and provisions for asset impairments. As a result, ONEOK Partners may be able to make cash distributions during periods when it records losses and may not be able to make cash distributions during periods when it records net income.

ITEM 1B.                      UNRESOLVED STAFF COMMENTS

Not applicable.

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ITEM 2.                      PROPERTIES

DESCRIPTION OF PROPERTIES

ONEOK Partners

Property - Our ONEOK Partners segment owns the following assets:

·   approximately 10,300 miles and 5,600 miles of natural gas gathering pipelines in the Mid-Continent and Rocky Mountain regions, respectively;

·   nine natural gas processing plants, with approximately 645 MMcf/d of processing capacity, in the Mid-Continent region, and five natural gas processing plants, with approximately 215 MMcf/d of processing capacity, in the Rocky Mountain region;

·   approximately 24 MBbl/d of natural gas liquids fractionation capacity at various natural gas processing plants in the Mid-Continent and Rocky Mountain regions;

·   approximately 1,500 miles of FERC-regulated interstate natural gas pipelines with approximately 3.1 Bcf/d of peak transportation capacity;

·   approximately 5,600 miles of intrastate natural gas gathering and state-regulated intrastate transmission pipelines with approximately 3.4 Bcf/d of peak transportation capacity;

·   approximately 51.7 Bcf of total active working natural gas storage capacity;

·   approximately 2,500 miles of natural gas liquids gathering pipelines with peak gathering capacity of approximately 629 MBbl/d;

·   approximately 160 miles of natural gas liquids distribution pipelines with approximately 66 MBbl/d of peak transportation capacity;

·   two natural gas liquids fractionators with approximately 260 MBbl/d of combined operating capacity, which are located in Oklahoma and Kansas;

·   a natural gas liquids fractionator with operating capacity of 150 MBbl/d located at the Bushton facility in Kansas, portion of which prior to June 30, 2011, was leased through an affiliate;

·   80-percent ownership interest in one natural gas liquids fractionator in Texas with ONEOK Partners’ proportional share of operating capacity of approximately 128 MBbl/d;

·   interest in one natural gas liquids fractionator in Kansas with ONEOK Partners’ proportional share of operating capacity of approximately 11 MBbl/d;

·   one isomerization unit in Kansas with 9 MBbl/d of operating capacity;

·   six natural gas liquids storage facilities and other leased facilities in Oklahoma, Kansas and Texas with approximately 23.2 MMBbl of total operating underground NGL storage capacity;

·   approximately 780 miles of FERC-regulated natural gas liquids gathering pipelines with approximately 213 MBbl/d of peak capacity;

·   approximately 3,500 miles of FERC-regulated natural gas liquids and refined petroleum products distribution pipelines with approximately 708 MBbl/d of peak capacity;

·   eight natural gas liquids product terminals in Missouri, Nebraska, Iowa and Illinois; and

·   above- and below-ground storage facilities associated with its FERC-regulated natural gas liquids pipeline operations in Iowa, Illinois, Nebraska and Kansas with 978 MBbl of combined operating capacity.

ONEOK Partners owns or leases five underground natural gas storage facilities in Oklahoma, three underground natural gas storage facilities in Kansas and three underground natural gas storage facilities in Texas.  One of its natural gas storage facilities in Kansas has been idle since 2001.  In compliance with a KDHE order, ONEOK Partners began injecting brine into that facility in the first quarter of 2007 in order to ensure the long-term integrity of the idled facility.  ONEOK Partners expects to complete the injection process by the end of 2012.  Monitoring of the facility and review of the data for the geo-engineering studies are ongoing, in compliance with a KDHE order while ONEOK Partners evaluates the alternatives for the facility.  Following the testing of the gathered data, ONEOK Partners expects that the facility will be returned to storage service, although most likely for a product other than natural gas.  The return to service will require KDHE approval.  It is possible, however, that testing could reveal that it is not safe to return the facility to service or that the KDHE will not grant the required permits to resume service.

Utilization - The utilization rates for ONEOK Partners’ various assets for 2011 and 2010 were as follows:

·   natural gas processing plants were approximately 71 percent and 69 percent utilized, respectively;

·   natural gas pipelines were approximately 83 percent and 87 percent subscribed, respectively, and storage facilities were fully subscribed both years;

·   non-FERC-regulated natural gas liquids pipelines were approximately 71 percent and 56 percent subscribed, respectively;

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·   average contracted natural gas liquids storage volumes were approximately 63 percent and 64 percent of storage capacity, respectively;

·   natural gas liquids fractionators were approximately 89 percent and 93 percent utilized, respectively;

·   FERC-regulated natural gas liquids gathering pipelines were approximately 97 percent and 70 percent utilized, respectively; and

·   FERC-regulated natural gas liquids distribution pipelines were approximately 65 percent and 63 percent utilized, respectively.

ONEOK Partners calculates utilization on its assets using a weighted-average approach, adjusting for the dates that assets were placed in service.  The utilization rate of ONEOK Partners’ FERC-regulated natural gas liquids gathering pipelines reflect Overland Pass Pipeline and its related lateral pipelines until Overland Pass Pipeline Company was deconsolidated in September 2010.  The utilization rate of ONEOK Partners’ fractionation facilities reflects leased capacity and the approximate proportional capacity associated with ONEOK Partner’s ownership interests.

Natural Gas Distribution

Property - We own approximately 18,600 miles of pipeline and other natural gas distribution facilities in Oklahoma; approximately 12,800 miles of pipeline and other natural gas distribution facilities in Kansas; and approximately 9,800 miles of pipeline and other natural gas distribution facilities in Texas.  In addition, we have 39.3 Bcf of natural gas storage capacity under lease with maximum withdrawal capacity of approximately 1.0 Bcf/d.

Energy Services

Property - Our total natural gas storage capacity under lease is 75.6 Bcf, with maximum withdrawal capability of 2.4 Bcf/d and maximum injection capability of 1.3 Bcf/d.  At December 31, 2011, our natural gas transportation capacity was 1.2 Bcf/d, of which 1.1 Bcf/d was contracted under long-term natural gas transportation contracts.  Our contracted storage and transportation capacity connects major supply and demand centers throughout the United States and into Canada.  We have 22 different storage leases throughout the United States.

Other

Property - We own the 17-story ONEOK Plaza office building, with approximately 517,000 square feet of net rentable space, and an associated parking garage.

ITEM 3.                      LEGAL PROCEEDINGS

Thomas F. Boles, et al. v. El Paso Corporation, et al. (f/k/a Will Price, et al. v. Gas Pipelines, et al.,  f/k/a Quinque Operating Company, et al. v. Gas Pipelines, et al.), 26th Judicial District, District Court of Stevens County, Kansas, Civil Department, Case No. 99C30 (“Boles I”). Plaintiffs brought suit on May 28, 1999, against us and our division, Oklahoma Natural Gas, four subsidiaries of ONEOK Partners, Mid-Continent Market Center, L.L.C., ONEOK Field Services Company, L.L.C., ONEOK WesTex Transmission, L.L.C. and ONEOK Hydrocarbon, L.P. (formerly Koch Hydrocarbon, LP, successor to Koch H`ydrocarbon Company), as well as approximately 225 other defendants.  Plaintiffs sought class certification for their claims for monetary damages, alleging that the defendants had underpaid gas producers and royalty owners throughout the United States by intentionally understating both the volume and the heating content of purchased gas.  After extensive briefing and a hearing, the Court refused to certify the class sought by plaintiffs. Plaintiffs then filed an amended petition limiting the purported class to gas producers and royalty owners in Kansas, Colorado and Wyoming and limiting the claim to undermeasurement of volumes.  On September 18, 2009, the Court denied the plaintiffs' motions for class certification, which, in effect, limits the named plaintiffs to pursuing individual claims against only those defendants who purchased or measured their gas.  The plaintiffs’ motion for reconsideration of the Court’s denial of class certification was denied on March 31, 2010.  This case continues but is now limited to the individual claims of the two named plaintiffs.

Thomas F. Boles, et al. v. El Paso Corporation, et al. (f/k/a Will Price and Stixon Petroleum, et al. v. Gas Pipelines, et al.), 26th Judicial District, District Court of Stevens County, Kansas, Civil Department, Case No. 03C232 (“Boles II”).  This action was filed by the plaintiffs on May 12, 2003, after the Court denied class status in Boles I. Plaintiffs are seeking monetary damages based upon a claim that 21 groups of defendants, including us and our division, Oklahoma Natural Gas, four subsidiaries of ONEOK Partners, Mid-Continent Market Center, L.L.C., ONEOK Field Services Company, L.L.C., ONEOK WesTex Transmission, L.L.C. and ONEOK Hydrocarbon, L.P. (formerly Koch Hydrocarbon, LP, successor to Koch Hydrocarbon Company), intentionally underpaid gas producers and royalty owners by understating the heating content of purchased gas in Kansas, Colorado and Wyoming.  Boles II has been consolidated with Boles I for the determination of whether either or both cases may be certified properly as class actions.  On September 18, 2009, the Court denied the

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plaintiffs' motions for class certification, which, in effect, limits the named plaintiffs to pursuing individual claims against only those defendants who purchased or measured their gas.  The plaintiffs’ motion for reconsideration of the Court’s denial of class certification was denied on March 31, 2010.  This case continues but is now limited to the individual claims of the two named plaintiffs.

Gas Index Pricing Litigation: We, ONEOK Energy Services Company, L.P. (“OESC”) and one other affiliate are defending, either individually or together, against the following lawsuits that claim damages resulting from the alleged market manipulation or false reporting of prices to gas index publications by us and others:  Sinclair Oil Corporation v. ONEOK Energy Services Corporation, L.P., et al. (filed in the United States District Court for the District of Wyoming in September 2005, transferred to MDL-1566 in the United States District Court for the District of Nevada); Reorganized FLI, Inc. (formerly J.P. Morgan Trust Company) v. ONEOK, Inc., et al. (filed in the District Court of Wyandotte County, Kansas, in October 2005, transferred to MDL-1566 in the United States District Court for the District of Nevada); Learjet, Inc., et al. v. ONEOK, Inc., et al. (filed in the District Court of Wyandotte, Kansas, in November 2005, transferred to MDL-1566 in the United States District Court for the District of Nevada); Breckenridge Brewery of Colorado, LLC, et al. v. ONEOK, Inc., et al. (filed in the District Court of Denver County, Colorado, in May 2006, transferred to MDL-1566 in the United States District Court for the District of Nevada); Arandell Corporation, et al. v. Xcel Energy, Inc., et al. (filed in the Circuit Court for Dane County, Wisconsin, in December 2006, transferred to MDL-1566 in the United States District Court for the District of Nevada); Heartland Regional Medical Center, et al. v. ONEOK, Inc., et al. (filed in the Circuit Court of Buchanan County, Missouri, in March 2007, transferred to MDL-1566 in the United States District Court for the District of Nevada); NewPage Wisconsin System v. CMS Energy Resource Management Company, et al. (filed in the Circuit Court for Wood County, Wisconsin, in March 2009, transferred to MDL-1566 in the United States District Court for the District of Nevada and now consolidated with the Arandell case).  In each of these lawsuits, the plaintiffs allege that we, OESC and one other affiliate and approximately ten other energy companies and their affiliates engaged in an illegal scheme to inflate natural gas prices by providing false information to gas price index publications.  All of the complaints arise out of a CFTC investigation into and reports concerning false gas price index-reporting or manipulation in the energy marketing industry during the years from 2000 to 2002.

On July 18, 2011, the trial court granted judgments in favor of ONEOK, Inc., OESC and other unaffiliated entities in the following cases: Reorganized FLI, Learjet, Arandell, Heartland, and NewPage.  A final judgment in favor of all defendants was also granted in the Breckenridge case. The court also granted a final judgment in favor of OESC on all state law claims asserted in the Sinclair case.   The plaintiffs in those cases case have appealed the judgments entered by the trial court to the United States Court of Appeals for the Ninth Circuit.  All of the appeals have been consolidated for briefing purposes by the Ninth Circuit.  On August 18, 2011, the trial court entered an order approving a stipulation by the plaintiffs and our affiliate, Kansas Gas Marketing Company (“KGMC”), for a dismissal without prejudice of the plaintiffs’ claims against KGMC in the Learjet and Heartland cases.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

MARKET INFORMATION AND HOLDERS

Our common stock is listed on the NYSE under the trading symbol “OKE.”  The corporate name ONEOK is used in newspaper stock listings.  The following table sets forth the high and low closing prices of our common stock for the periods indicated:

	Year Ended				Year Ended
	December 31, 2011				December 31, 2010
	High		Low		High		Low
First Quarter	$	66.88	$	55.38	$	47.15	$	40.62
Second Quarter	$	74.01	$	64.23	$	50.72	$	42.00
Third Quarter	$	75.95	$	59.31	$	47.91	$	42.29
Fourth Quarter	$	86.70	$	64.21	$	55.69	$	45.64

At February 14, 2012, there were 14,583 holders of record of our 103,893,790 outstanding shares of common stock.

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DIVIDENDS

The following table sets forth the quarterly dividends declared and paid per share of our common stock during the periods indicated:

	Years Ended December 31,
	2011		2010		2009
First Quarter	$	0.52	$	0.44	$	0.40
Second Quarter	$	0.52	$	0.44	$	0.40
Third Quarter	$	0.56	$	0.46	$	0.42
Fourth Quarter	$	0.56	$	0.48	$	0.42
Total	$	2.16	$	1.82	$	1.64

In January 2012, we declared a dividend of $0.61 per share ($2.44 per share on an annualized basis) for the fourth quarter of 2011, which was paid on February 14, 2012, to shareholders of record as of January 31, 2012.

ISSUER PURCHASES OF EQUITY SECURITIES

The following table sets forth information relating to our purchases of our common stock for the periods shown:

Period	Total Number of Shares   Purchased (a)		Average Price  Paid per Share		Total Number of Shares Purchased as  Part of Publicly  Announced Plans or  Programs		Maximum Number (or Approximate Dollar Value) of Shares (or Units) that  May Be Purchased Under the Plans or Programs
October 1-31, 2011		6,660	$	28.15		-
November 1-30, 2011		5,744	$	18.10		-
December 1-31, 2011		-		-		-
Total		12,404	$	23.49		-	$	450,000,000	(b)
(a) - Includes shares withheld pursuant to attestation of ownership and deemed tendered to us in connection with the exercise
of stock options under the ONEOK, Inc. Long-Term Incentive Plan.
(b) - The maximum approximate dollar value of shares that may yet be purchased pursuant to our approximately $750 million
stock repurchase program that was announced on October 21, 2010, subject to the limitation that purchases will not exceed
$300 million in any one calendar year. The program will terminate upon the completion of the repurchase of $750 million of
common stock or on December 31, 2013, whichever occurs first.

EMPLOYEE STOCK AWARD PROGRAM

Under our Employee Stock Award Program, we issued, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE was for the first time at or above $26 per share.  Shares issued to employees under this program during 2011 totaled 147,847, and compensation expense related to the Employee Stock Award Plan was $16.0 million.  For 2010, the number of shares issued under this program was immaterial, and there were no shares issued in 2009.

The total number of shares of our common stock available for issuance under this program was 300,000.  During 2011, the number of shares of our common stock available for distribution under this program was met.  Shareholder approval is required for further stock awards to be issued under the program.  The shares issued under this program have not been registered under the Securities Act, in reliance upon the position taken by the SEC (see Release No. 6188, dated February 1, 1980) that the issuance of shares to employees pursuant to a program of this kind does not require registration under the Securities Act.  See Note L of the Notes to Consolidated Financial Statements in this Annual Report for additional information.

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PERFORMANCE GRAPH

The following performance graph compares the performance of our common stock with the S&P 500 Index and the S&P Utilities Index during the period beginning on December 31, 2006, and ending on December 31, 2011.  The graph assumes a $100 investment in our common stock and in each of the indices at the beginning of the period and a reinvestment of dividends paid on such investments throughout the period.

Value of $100 Investment Assuming Reinvestment of Dividends

at December 31, 2006, and at the End of Every Year Through December 31, 2011,

Among ONEOK, Inc., The S&P 500 Index and The S&P Utilities Index

	Cumulative Total Return
	Years Ended December 31,
	2007		2008		2009		2010		2011
ONEOK, Inc.	$	106.90	$	72.16	$	116.45	$	150.65	$	242.74
S&P 500 Index	$	105.49	$	66.47	$	84.06	$	96.74	$	98.76
S&P Utilities Index (a)	$	119.36	$	84.75	$	94.87	$	100.08	$	119.98
(a) - The Standard & Poors Utilities Index is comprised of the following companies: AES Corp.; AGL Resource, Inc.; Ameren Corp.; American Electric Power Co., Inc.; Centerpoint Energy, Inc.; CMS Energy Corp.; Consolidated Edison, Inc.; Constellation Energy Group, Inc.; Dominion Resources, Inc.; DTE Energy Co.; Duke Energy Corp.; Edison International; Entergy Corp.; Exelon Corp.; FirstEnergy Corp.; Integrys Energy Group, Inc.; NextEra Energy, Inc.; NiSource, Inc.; Northeast Utilities; NRG Energy, Inc.; Pepco Holdings, Inc.; PG&E Corp.; Pinnacle West Capital Corp.; PPL Corp.; Progress Energy, Inc.; Public Service Enterprise Group, Inc.; SCANA Corp.; Sempra Energy; Southern Co.; TECO Energy, Inc.; Wisconsin Energy Corp.; and Xcel Energy, Inc.

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ITEM 6. SELECTED FINANCIAL DATA

The following table sets forth our selected financial data for each of the periods indicated:

	Years Ended December 31,
	2011		2010		2009		2008		2007
	(Millions of dollars except per share amounts)
Revenues	$	14,805.8	$	12,678.8	$	10,805.8	$	15,514.3	$	12,936.9
Income from continuing operations	$	757.5	$	540.1	$	483.7	$	595.0	$	493.1
Income from continuing operations attributable    to ONEOK	$	358.4	$	333.4	$	297.9	$	306.4	$	299.9
Net income attributable to ONEOK	$	360.6	$	334.6	$	305.5	$	311.9	$	304.9
Total assets	$	13,696.6	$	12,499.2	$	12,827.7	$	13,126.1	$	11,062.0
Long-term debt, including current maturities	$	4,893.9	$	4,329.8	$	4,602.2	$	4,230.8	$	4,635.5
Earnings per share - continuing operations
Basic	$	3.42	$	3.14	$	2.83	$	2.94	$	2.79
Diluted	$	3.34	$	3.09	$	2.80	$	2.91	$	2.74
Earnings per share - total
Basic	$	3.44	$	3.15	$	2.90	$	2.99	$	2.84
Diluted	$	3.36	$	3.10	$	2.87	$	2.95	$	2.79
Dividends declared per common share	$	2.16	$	1.82	$	1.64	$	1.56	$	1.40

The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.  See Note B of The Notes to Consolidated Financial Statements in this Annual Report for additional information on our discontinued operations.

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with our audited consolidated financial statements and the Notes to Consolidated Financial Statements in this Annual Report.

RECENT DEVELOPMENTS

The following discussion highlights some of our planned activities, recent achievements and significant issues affecting us.  Please refer to the “Financial Results and Operating Information,” and “Liquidity and Capital Resources” sections of Management’s Discussion and Analysis of Financial Condition and Results of Operation and our consolidated financial statements and Notes to Consolidated Financial Statements for additional information.

Growth Projects - Drilling rig counts are higher compared with 2010, and related development activities continue to progress in many regions of ONEOK Partners’ operations.  Increasing natural gas and NGL production resulting from these activities and higher petrochemical industry demand for NGL products have required additional capital investments to increase the capacity of the infrastructure to bring these commodities from supply basins to market.  In response to this increased production and demand for NGL products, ONEOK Partners is investing approximately $2.7 billion to $3.3 billion in capital projects to meet the needs of oil and natural gas producers in the Bakken Shale, the Cana-Woodford Shale, the Granite Wash and Mississippian Lime areas, and to provide additional NGL infrastructure in the Rocky Mountain, Mid-Continent and Gulf Coast regions that will enhance its ability to distribute NGL products to meet the increasing petrochemical industry and NGL export demand.  When completed, these projects are anticipated to provide additional earnings and cash flows.  See discussion of ONEOK Partners’ growth projects in the “Financial Results and Operating Information” section for our ONEOK Partners segment.

Stock Repurchase Program - In 2011, we repurchased approximately 4.3 million shares of our common stock for approximately $300 million pursuant to an accelerated stock repurchase agreement.  This stock repurchase was part of our three-year stock repurchase program to buy up to $750 million of our common stock that was authorized by our Board of Directors in October 2010.

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Dividends/Distributions - During 2011, we paid dividends totaling $2.16 per share, an increase of approximately 18.7 percent over the $1.82 per share paid during 2010.  We declared a quarterly dividend of $0.61 per share ($2.44 per share on an annualized basis) in January 2012, an increase of approximately 17.3 percent over the $0.52 declared in January 2011.  During 2011, ONEOK Partners paid cash distributions totaling $2.325 per unit, an increase of approximately 4.3 percent over the $2.23 per unit paid during 2010.  ONEOK Partners paid total cash distributions to us in 2011 of $333 million, which includes $197 million resulting from our limited-partner interest and $136 million related to our general-partner interest.  A cash distribution from ONEOK Partners of $0.61 per unit ($2.44 per unit on an annualized basis) was declared in January 2012, an increase of approximately 7.0 percent over the $0.57 declared in January 2011.

Credit Agreements - In April 2011, ONEOK entered into the ONEOK 2011 Credit Agreement, which is a $1.2 billion revolving credit facility scheduled to expire in April 2016.  In August 2011, ONEOK Partners entered into the ONEOK Partners 2011 Credit Agreement, which is a $1.2 billion revolving credit facility scheduled to expire in August 2016.

Debt Issuance and Maturities - In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041.  The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

In 2011, ONEOK repaid $400 million of maturing senior notes and redeemed $90.5 million of 6.4-percent senior notes with available cash and short-term borrowings.

In January 2012, we completed an underwritten public offering of $700 million of 4.25-percent senior notes due 2022.  The net proceeds from the offering, after deducting underwriting discounts and offering expenses, of approximately $693.9 million were used to repay amounts outstanding under our $1.2 billion commercial paper program and for general corporate purposes, which may include one or more of the following:  the repurchase of our common stock, the purchase of additional common units of ONEOK Partners and the payment of dividends.

Unit Split - In July 2011, ONEOK Partners completed a two-for-one split of our common and Class B units by a distribution of one unit for each unit outstanding and held by unitholders of record on June 30, 2011.  In July 2011, ONEOK Partners’ partnership agreement was amended to adjust the formula for distributing available cash among the general partner and limited partners to reflect the unit split.  As a result of this unit split, we have adjusted all unit and per-unit amounts contained herein to be presented on a post-split basis.

Stock Split - On February 15, 2012, our Board of Directors authorized a two-for-one split of our common stock, subject to shareholder approval of a proposal to increase the number of authorized shares of our common stock to 600 million from 300 million.  The proposal will be voted on at our 2012 annual meeting of shareholders on May 23, 2012.

Retail Marketing Sale - In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  As a result, we expect to recognize a pre-tax gain of approximately $20 million to $23 million in the first quarter of 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

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FINANCIAL RESULTS AND OPERATING INFORMATION

Consolidated Operations

Selected Financial Results - The following table sets forth certain selected financial results for the periods indicated:

										Variances					Variances
	Years Ended December 31,									2011 vs. 2010					2010 vs. 2009
Financial Results	2011			2010			2009			Increase (Decrease)					Increase (Decrease)
	(Millions of dollars)
Revenues	$	14,805.8		$	12,678.8		$	10,805.8		$	2,127.0		17	%	$	1,873.0		17	%
Cost of sales and fuel		12,425.4			10,616.6			8,807.8			1,808.8		17	%		1,808.8		21	%
Net margin		2,380.4			2,062.2			1,998.0			318.2		15	%		64.2		3	%
Operating costs		908.3			830.9			831.0			77.4		9	%		(0.1	)	(0	%)
Depreciation and amortization		312.2			307.2			288.9			5.0		2	%		18.3		6	%
Gain (loss) on sale of assets		(1.0	)		18.6			4.8			(19.6	)	*			13.8		*
Operating income	$	1,158.9		$	942.7		$	882.9		$	216.2		23	%	$	59.8		7	%
Equity earnings from investments	$	127.2		$	101.9		$	72.7		$	25.3		25	%	$	29.2		40	%
Interest expense	$	(297.0	)	$	(292.2	)	$	(300.8	)	$	4.8		2	%	$	(8.6	)	(3	%)
Net income	$	759.7		$	541.3		$	491.2		$	218.4		40	%	$	50.1		10	%
Net income attributable to    noncontrolling interests	$	399.2		$	206.7		$	185.8		$	192.5		93	%	$	20.9		11	%
Net income attributable to ONEOK	$	360.6		$	334.6		$	305.5		$	26.0		8	%	$	29.1		10	%
Capital expenditures	$	1,336.1		$	582.7		$	791.2		$	753.4		*		$	(208.5	)	(26	%)
* Percentage change is greater than 100 percent.

2011 vs. 2010 - NGL and condensate prices were higher while natural gas prices decreased during 2011, compared with 2010.  These changes in commodity prices had a direct impact on our revenues and cost of sales and fuel.

Operating income increased 23 percent in 2011 reflecting higher results from our ONEOK Partners segment, offset partially by lower operating income from our Distribution and Energy Services segments.  Our ONEOK Partners segment’s operating income significantly increased due primarily to more favorable NGL location differentials and higher NGL volumes gathered and fractionated, offset partially by the deconsolidation of Overland Pass Pipeline in September 2010 in its natural gas liquids business and lower natural gas transportation margins due to narrower natural gas price location differentials in its natural gas pipelines business.

Our Natural Gas Distribution segment’s operating income decreased 12 percent in 2011 due to increased operating costs.

Our Energy Services segment’s operating income decreased significantly in 2011 due primarily to lower transportation margins and storage and marketing margins, net of hedging activities.

Operating costs increased in 2011 due primarily to higher short-term incentive and share-based compensation and other labor and benefit costs for all segments and higher materials and outside services expenses in our ONEOK Partners segment.

Gain (loss) on sale of assets decreased from 2010, which reflected a $16.3 million gain on the sale of a 49-percent interest of Overland Pass Pipeline Company.

Equity earnings from investments increased in 2011, compared with the same period last year, due to the impact of accounting for Overland Pass Pipeline Company as an equity method investment beginning in September 2010 and increased contracted capacity on Northern Border Pipeline.

Net income attributable to noncontrolling interests, primarily reflects the portion of ONEOK Partners that we do not own and reflects higher earnings in our ONEOK Partners segment during 2011.

Capital expenditures increased during 2011 due primarily to the growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses.

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2010 vs. 2009 - Commodity prices were generally higher during 2010, compared with 2009, which had a direct impact on our revenues and cost of sales and fuel.  Our operating results include the benefits from a full year of ONEOK Partners’ more than $2.0 billion of completed growth projects that were placed in service in 2009.

Operating income increased 7 percent in 2010, when compared with 2009, reflecting higher NGL volumes, higher contracted natural gas transportation capacity, an increase in natural gas processing volumes, higher natural gas and NGL storage margins and a gain on the sale of a 49-percent ownership interest in Overland Pass Pipeline Company in our ONEOK Partners segment.  These increases were offset partially by ONEOK Partners’ lower NGL optimization margins.  Our Distribution segment benefited from new rates in Oklahoma that increased fixed fees and lowered our volumetric sensitivity, providing more consistent revenues each month.  Our Energy Services segment’s results were consistent with the prior year, with higher realized seasonal storage price differentials and marketing margins offset by lower realized Mid-Continent-to-Gulf Coast transportation margins and lower premium-services margins.

Operating costs increased due primarily to the recognition of previously deferred integrity-management costs in our Natural Gas Distribution segment that are now being recovered through rates, offset partially by lower than estimated ad valorem taxes in our ONEOK Partners segment and lower legal-related costs in our Energy Services segment.

Our results were also favorably impacted by increased equity earnings from investments in our ONEOK Partners segment.  The overall increase was due primarily to increased contracted capacity on Northern Border Pipeline, which benefited from wider natural gas price differentials between the markets it serves, and as a result of accounting for ONEOK Partners’ 50-percent investment in Overland Pass Pipeline Company as an equity investment beginning September 2010.   

More information regarding our results of operations is provided in the following discussion of operating results for each of our segments.

ONEOK Partners

Growth Projects - Natural gas gathering and processing business - ONEOK Partners’ natural gas gathering and processing business is investing approximately $950 million to $1.1 billion in growth projects in the Williston Basin and Cana-Woodford Shale areas that will enable ONEOK Partners to meet the rapidly growing needs of crude oil and natural gas producers in those areas.

Williston Basin Processing Plants and related projects - ONEOK Partners projects in this basin include three 100 MMcf/d natural gas processing facilities:  the Garden Creek plant in eastern McKenzie County, North Dakota, and the Stateline I and II plants in western Williams County, North Dakota.  ONEOK Partners has multi-year supply commitments and acreage dedications for all the capacity of the Garden Creek and Stateline I plants and for approximately 75 percent of the Stateline II plant’s capacity.  In addition, ONEOK Partners will expand and upgrade its existing gathering and compression infrastructure and add new well connections associated with these plants.  The Garden Creek plant, which was placed in service in December 2011, and related infrastructure projects are expected to cost approximately $350 million to $415 million, excluding AFUDC.  The Stateline I plant, which is expected to be in service by the third quarter of 2012, and related infrastructure projects are expected to cost approximately $300 million to $355 million, excluding AFUDC.  The Stateline II plant, which is expected to be in service during the first half of 2013, and related infrastructure projects are expected to cost approximately $260 million to $305 million, excluding AFUDC.

Horizontal wells drilled in the Williston Basin are economically justified by producers primarily by crude oil economics.  Accordingly, ONEOK Partners’ growth in this area is expected to shift our supply exposure from natural gas production economics toward crude oil production economics.  In addition, ONEOK Partners expects its commodity price exposure to increase particularly to NGLs and natural gas, as equity volumes increase under its POP contracts with its customers in the Williston Basin.

Cana-Woodford Shale projects - In 2010, ONEOK Partners completed projects totaling approximately $38 million in the Cana-Woodford Shale development in Oklahoma, which included the connection of its western Oklahoma natural gas gathering system to its Maysville natural gas processing facility in central Oklahoma, as well as new well connections to gather and process additional Cana-Woodford Shale natural gas volumes.

In both the Williston Basin and Cana Woodford Shale project areas, nearly all of the new gas production is from horizontally drilled and completed wells.  These wells tend to produce at higher initial volumes; however, they generally have higher initial decline rates than conventional vertical wells, but the decline curves flatten out. These wells are expected to have long-lasting reserves.  ONEOK Partners expects the routine growth capital needed to connect to new wells and expand its infrastructure to be higher compared with its previous experience.

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Natural gas liquids business - The growth strategy in ONEOK Partners’ natural gas liquids business is focused around the oil and natural gas drilling activity in shale and other resource plays from the Rocky Mountain region through the Mid-Continent region down into Texas.  Increasing natural gas and NGL production resulting from this activity and higher petrochemical industry demand for NGL products have required ONEOK Partners to make additional capital investments to increase the capacity of its infrastructure to bring these commodities from supply basins to market.  ONEOK Partners’ natural gas liquids business is investing approximately $1.7 billion to $2.2 billion through 2014.  This investment will accommodate the gathering and fractionation of growing NGL supplies from the shale and other resource plays across ONEOK Partners’ asset base and alleviate infrastructure constraints between the Mid-Continent and Texas Gulf Coast regions that will enhance its ability to distribute NGL products to meet the increasing petrochemical industry and NGL export demand in the Gulf Coast.  ONEOK Partners’ supply commitments from producers and natural gas processors associated with these growth projects will provide incremental and long-term fee-based earnings to its NGL business.  Over time, these growing fee-based volumes will  fill a portion of the capacity used in 2011 to capture the price differentials between the Mid-Continent and Gulf Coast market centers.  In addition, we believe the price differentials between the Mid-Continent and Gulf Coast market centers will narrow over the long-term as new fractionators and pipelines, including ONEOK Partners’ MB-2 fractionator and Sterling III pipeline, begin to alleviate constraints impacting NGL prices and the location price differential between the two market centers.

Sterling III Pipeline - ONEOK Partners plans to build a 570-plus-mile natural gas liquids pipeline, the Sterling III Pipeline, which will have the flexibility to transport either unfractionated NGLs or NGL products from the Mid-Continent to the Texas Gulf Coast.  The Sterling III Pipeline will traverse the NGL-rich Woodford Shale that is currently under development, as well as provide transportation capacity for the growing NGL production from the Cana-Woodford Shale and Granite Wash areas, where the pipeline can gather unfractionated NGLs from the new natural gas processing plants that are being built as a result of increased drilling activity in these areas.  The Sterling III Pipeline will have an initial capacity to transport up to 193 MBbl/d of production from ONEOK Partners’ natural gas liquids infrastructure at Medford, Oklahoma, to its storage and fractionation facilities in Mont Belvieu, Texas.  ONEOK Partners has multi-year supply commitments from producers and natural gas processors for approximately 75 percent of the pipeline’s capacity.  Additional pump stations could expand the capacity of the pipeline to 250 MBbl/d.  Following the receipt of all necessary permits and the acquisition of rights-of-way, construction is scheduled to begin in 2013, with an expected completion late in the same year.

The investment also includes reconfiguring its existing Sterling I and II Pipelines, which currently distribute NGL products between the Mid-Continent and Gulf Coast NGL market centers, to transport either unfractionated NGLs or NGL products.

The project costs for the new pipeline and reconfiguring projects are estimated to be $610 million to $810 million, excluding AFUDC.

MB-2 fractionator - ONEOK Partners plans to construct a 75-MBbl/d fractionator, MB-2, near ONEOK Partners’ storage facility in Mont Belvieu, Texas.  The Texas Commission on Environmental Quality (TCEQ) has approved the permit application to build this fractionator.  Construction of the MB-2 fractionator began in June 2011 and is expected to be completed in mid-2013.  The cost of the MB-2 fractionator is estimated to be $300 million to $390 million, excluding AFUDC.  ONEOK Partners has multi-year supply commitments from producers and natural gas processors for all of the fractionator’s capacity.  The fractionator can be expanded to 125 MBbl/d to accommodate additional NGL volumes from the Arbuckle Pipeline and the Sterling I, II and III pipelines.

Bakken Pipeline and related projects - ONEOK Partners plans to build a 525- to 615-mile natural gas liquids pipeline, the Bakken Pipeline, to transport unfractionated NGLs from the Williston Basin to the Overland Pass Pipeline.  The Bakken Pipeline initially will have the capacity to transport up to 60 MBbl/d of unfractionated NGL production and can be expanded to 110 MBbl/d with additional pump stations.  The unfractionated NGLs will then be delivered to ONEOK Partners’ existing natural gas liquids fractionation and distribution infrastructure in the Mid-Continent.  Project costs for the new pipeline are estimated to be $450 million to $550 million, excluding AFUDC.

NGL supply commitments for the Bakken Pipeline will be anchored by NGL production from ONEOK Partners’ natural gas processing plants in the Williston Basin.  Following receipt of all necessary permits, construction of the 12-inch diameter pipeline is expected to begin in the second quarter of 2012 and be in service during the first half of 2013.

The unfractionated NGLs from the Bakken Pipeline and other supply sources under development in the Rocky Mountain region will require installing additional pump stations and expanding existing pump stations on the Overland Pass Pipeline, in which ONEOK Partners owns a 50-percent equity interest.  These additions and expansions will increase the capacity of Overland Pass Pipeline to 255 MBbl/d.  ONEOK Partners’ anticipated share of the costs for this project is estimated to be $35 million to $40 million, excluding AFUDC.

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Bushton Fractionator Expansion - To accommodate the additional volume from the Bakken Pipeline, ONEOK Partners is investing $110 million to $140 million, excluding AFUDC, to expand and upgrade its existing fractionation capacity at Bushton, Kansas, increasing its capacity to 210 MBbl/d from 150 MBbl/d.  This project is expected to be in service during the fourth quarter of 2012.

Cana-Woodford Shale and Granite Wash projects - ONEOK Partners plans to invest approximately $197 million to $257 million, excluding AFUDC, in its existing Mid-Continent infrastructure, primarily in the Cana-Woodford Shale and Granite Wash areas.  These investments will expand ONEOK Partners’ ability to transport unfractionated NGLs from these Mid-Continent supply areas to fractionation facilities in Oklahoma and Texas and distribute NGL products to the Mid-Continent, Gulf Coast and upper Midwest market centers.

These investments include constructing more than 230 miles of natural gas liquids pipelines that will expand its existing Mid-Continent natural gas liquids gathering system in the Cana-Woodford Shale and Granite Wash areas.  The pipelines will connect to three new third-party natural gas processing facilities that are under construction and to three existing third-party natural gas processing facilities that are being expanded.  Additionally, ONEOK Partners will install additional pump stations on the Arbuckle Pipeline to increase its capacity to 240 MBbl/d.  When completed, these projects are expected to add, through multi-year supply contracts, approximately 75 to 80 MBbl/d of unfractionated NGL, to ONEOK Partners’ existing natural gas liquids gathering systems.  These projects are expected to be completed early in the second quarter of 2012 and cost approximately $180 million to $240 million, excluding AFUDC.

In 2010, ONEOK Partners invested approximately $17 million to increase the accessibility of new NGL supply to the Arbuckle Pipeline and Mont Belvieu fractionation facilities.

Sterling I Pipeline Expansion - In 2011, ONEOK Partners installed seven additional pump stations at a cost of approximately $30 million, excluding AFUDC, along its existing Sterling I natural gas liquids distribution pipeline, increasing its capacity by 15 MBbl/d, which is supplied by ONEOK Partners’ Mid-Continent natural gas liquids infrastructure.  The Sterling I pipeline transports NGL products from ONEOK Partners’ fractionator in Medford, Oklahoma, to the Mont Belvieu, Texas, market center.

For a discussion of ONEOK Partners’ capital expenditure financing, see “Capital Expenditures” in “Liquidity and Capital Resources” on page 58.

Selected Financial Results and Operating Information - ONEOK Partners’ 2011 and 2010 operating results reflect increases in NGL volumes gathered, fractionated and sold in its natural gas liquids business and natural gas volumes processed in the Williston Basin in its natural gas gathering and processing business.  ONEOK Partners expects continued development of the reserves in the Bakken Shale and Three Forks formations in the Williston Basin and in the Cana-Woodford Shale and Granite Wash areas in Oklahoma and Texas, as drilling activities increase in these areas.

The following table sets forth certain selected financial results for our ONEOK Partners segment for the periods indicated:

										Variances					Variances
	Years Ended December 31,									2011 vs. 2010					2010 vs. 2009
Financial Results	2011			2010			2009			Increase (Decrease)					Increase (Decrease)
	(Millions of dollars)
Revenues	$	11,322.6		$	8,675.9		$	6,474.5		$	2,646.7		31	%	$	2,201.4		34	%
Cost of sales and fuel		9,745.2			7,531.0			5,355.2			2,214.2		29	%		2,175.8		41	%
Net margin		1,577.4			1,144.9			1,119.3			432.5		38	%		25.6		2	%
Operating costs		459.4			403.5			411.3			55.9		14	%		(7.8	)	(2	%)
Depreciation and amortization		177.5			173.7			164.1			3.8		2	%		9.6		6	%
Gain (loss) on sale of assets		(1.0	)		18.6			2.7			(19.6	)	*			15.9		*
Operating income	$	939.5		$	586.3		$	546.6		$	353.2		60	%	$	39.7		7	%
Equity earnings from investments	$	127.2		$	101.9		$	72.7		$	25.3		25	%	$	29.2		40	%
Interest expense	$	(223.1	)	$	(204.3	)	$	(206.0	)	$	18.8		9	%	$	(1.7	)	(1	%)
Capital expenditures	$	1,063.4		$	352.7		$	615.7		$	710.7		*		$	(263.0	)	(43	%)
* Percentage change is greater than 100 percent.

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2011 vs. 2010 - Net margin increased due primarily to the following:

·   an increase of $363.6 million in optimization and marketing margins in ONEOK Partners’ natural gas liquids business due primarily to the following:

-   an increase of $335.2 million from more favorable NGL price differentials and additional fractionation and transportation capacity available for optimization activities between the Conway, Kansas, and Mont Belvieu, Texas, NGL market centers; and

-   an increase of $28.4 from higher marketing volumes and more favorable margins on NGL products marketed;

·   an increase of $32.6 million due to higher net realized NGL and condensate prices in ONEOK Partners’ natural gas gathering and processing business;

·   an increase of $32.5 million from higher NGL volumes gathered and fractionated in Texas and the Mid-Continent and Rocky Mountain regions, excluding the impact of the September 2010 deconsolidation of Overland Pass Pipeline Company, and contract renegotiations for higher fees associated with ONEOK Partners’ NGL exchange services activities, offset partially by higher costs associated with NGL volumes fractionated by third parties in its natural gas liquids business;

·   an increase of $26.4 million related to higher isomerization margins resulting from wider price differentials between normal butane and iso-butane and higher isomerization volumes in ONEOK Partners’ natural gas liquids business;

·   an increase of $19.4 million due to higher natural gas volumes processed in the Williston Basin and western Oklahoma resulting from increased drilling activity, offsetting reduced drilling activity in certain parts of Kansas and weather-related outages during the first quarter in ONEOK Partners’ natural gas gathering and processing business;

·   an increase of $12.4 million due to higher storage margins as a result of contract renegotiations in ONEOK Partners’ natural gas liquids business; and

·   an increase of $8.8 million due to favorable changes in contract terms in ONEOK Partners’ natural gas gathering and processing business; offset partially by

·   a decrease of $42.8 million due to the deconsolidation of Overland Pass Pipeline Company, which is now accounted for under the equity method in ONEOK Partners’ natural gas liquids business;

·   a decrease of $12.5 million from lower natural gas transportation margins due to narrower natural gas price location differentials that decreased contracted transportation capacity on Midwestern Gas Transmission and interruptible transportation volumes across ONEOK Partners’ pipelines in its natural gas pipelines business; and

·   a decrease of $8.2 million due to lower natural gas volumes gathered as a result of continued production declines and reduced drilling activity by producers in the Powder River Basin in ONEOK Partners’ natural gas gathering and processing business.

Operating costs increased due primarily to the following:

·   an increase of $35.7 million in higher labor and employee-related costs associated with incentive and benefit plans, which includes higher share-based compensation costs resulting from common stock awarded to employees as part of ONEOK’s stock award program and the appreciation in ONEOK’s share price, affecting all of ONEOK Partners’ businesses;

·   an increase of $9.4 million from higher materials and outside services expenses associated primarily with scheduled maintenance at fractionation, pipeline and storage facilities in ONEOK Partners’ natural gas liquids business; and

·   an increase of $5.0 million due to higher ad valorem taxes associated with the completed capital projects in all of ONEOK Partners’ businesses; offset partially by

·   a decrease of $5.4 million due to the deconsolidation of Overland Pass Pipeline Company, which is now accounted for under the equity method of accounting in ONEOK Partners’ natural gas liquids business.

Gain (loss) on sale of assets decreased due to the $16.3 million gain on the sale of a 49-percent interest of Overland Pass Pipeline Company recorded in 2010.

Equity earnings include Overland Pass Pipeline Company in ONEOK Partners’ natural gas liquids business, which it began accounting for under the equity method of accounting in September 2010.  Equity earnings from investments increased due primarily to increased contracted capacity on Northern Border Pipeline in ONEOK Partners’ natural gas pipelines business.  Northern Border Pipeline benefited from wider natural gas price location differentials between the markets it serves, which resulted in a significant increase in its capacity being sold in 2011.  Substantially all of Northern Border Pipeline’s long-haul capacity has been contracted through March 2013.

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Capital expenditures increased due primarily to the growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses.

Previously, ONEOK Partners had a Processing and Services Agreement with us and OBPI, under which we contracted for all of OBPI’s rights, including all of the capacity of the Bushton Plant, reimbursing OBPI for all costs associated with the operation and maintenance of the Bushton Plant and its obligations under equipment leases covering portions of the Bushton Plant.  In April 2011, pursuant to its rights under the Processing and Services Agreement, ONEOK Partners directed OBPI to give notice of intent to exercise the purchase option for the leased equipment pursuant to the terms of the equipment leases.  On June 30, 2011, through a series of transactions, we sold OBPI to ONEOK Partners, and OBPI closed the purchase option and terminated the equipment leases.  The total amount paid by ONEOK Partners to complete the transactions was approximately $94.2 million, which included the reimbursement to us of obligations related to the Processing and Services Agreement.

2010 vs. 2009 - Net margin increased due primarily to the following:

·   an increase of $51.4 million due to higher NGL volumes gathered, fractionated and transported, primarily associated with the completion of the Arbuckle Pipeline and Piceance and D-J Basin lateral pipelines, as well as new NGL supply connections in ONEOK Partners’ natural gas liquids business;

·   an increase of $14.4 million due to higher storage margins, primarily as a result of contract renegotiations in ONEOK Partners’ natural gas pipelines and natural gas liquids businesses;

·   an increase of $9.1 million due to increased Williston Basin volumes in ONEOK Partners’ natural gas gathering and processing business; and

·   an increase of $8.7 million from higher natural gas transportation margins from an increase in contracted capacity on Midwestern Gas Transmission, Viking Gas Transmission’s Fargo lateral pipeline and the incremental margin from the Guardian Pipeline expansion and extension project in ONEOK Partners’ natural gas pipelines business; offset partially by

·   a decrease of $34.7 million related to lower optimization margins due to limited NGL fractionation and transportation capacity available for optimization activities between the Mid-Continent and Gulf Coast NGL market centers until September 2010 and less favorable NGL price differentials in ONEOK Partners’ natural gas liquids business;

·   a decrease of $7.8 million due to decreased volumes processed and sold in western Oklahoma and Kansas as a result of natural production declines, operational outages and a period of ethane rejection in ONEOK Partners’ natural gas gathering and processing business;

·   a decrease of $6.5 million from selling ONEOK Partners’ Lehman Brothers bankruptcy claims in 2009; and

·   a decrease of $6.3 million due to lower natural gas volumes gathered as a result of natural production declines and reduced drilling activity by its customers in the Powder River Basin in ONEOK Partners’ natural gas gathering and processing business.

Operating costs decreased due primarily to a decrease of $8.2 million due to lower than estimated ad valorem taxes associated with ONEOK Partners’ capital projects completed in 2009 in its natural gas liquids business.

Depreciation and amortization expense increased primarily as a result of ONEOK Partners’ capital projects completed in 2009 in its natural gas liquids and natural gas pipelines businesses, offset partially by the deconsolidation of Overland Pass Pipeline Company in the third quarter of 2010 in ONEOK Partners’ natural gas liquids business.

Gain (loss) on sale of assets increased due primarily to the gain on sale of a 49-percent ownership interest in Overland Pass Pipeline Company in ONEOK Partners’ natural gas liquids business.

Equity earnings from investments increased due primarily to increased contracted capacity on Northern Border Pipeline due to wider natural gas price differentials in ONEOK Partners’ natural gas pipelines business and equity earnings from ONEOK Partners’ investment in Overland Pass Pipeline Company, which was deconsolidated in September 2010.

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Selected Operating Information - The following table sets forth selected operating information for our ONEOK Partners segment for the periods indicated:

Operating Information	2011			2010			2009
Natural gas gathering and processing business (a)
Natural gas gathered (BBtu/d)		1,030			1,067			1,123
Natural gas processed (BBtu/d) (b)		713			674			658
NGL sales (MBbl/d)		48			44			43
Residue gas sales (BBtu/d)		317			286			291
Realized composite NGL net sales price ($/gallon) (c)	$	1.08		$	0.94		$	0.90
Realized condensate net sales price ($/Bbl) (c)	$	82.56		$	63.81		$	78.35
Realized residue gas net sales price ($/MMBtu) (c)	$	5.47		$	5.58		$	3.55
Realized gross processing spread ($/MMBtu) (c)	$	8.17		$	6.41		$	6.63
Natural gas pipelines business (a)
Natural gas transportation capacity contracted (MDth/d)		5,373			5,616			5,507
Transportation capacity subscribed		83	%		87	%		86	%
Average natural gas price
Mid-Continent region ($/MMBtu)	$	3.88		$	4.17		$	3.28
Natural gas liquids business
NGL sales (MBbl/d)		497			457			408
NGLs fractionated (MBbl/d) (d)		537			512			481
NGLs transported-gathering lines (MBbl/d) (a) (e)		436			440			372
NGLs transported-distribution lines (MBbl/d) (a)		473			468			459
Conway-to-Mont Belvieu OPIS average price differential
Ethane ($/gallon)	$	0.28		$	0.10		$	0.11
(a) - For consolidated entities only.
(b) - Includes volumes processed at company-owned and third-party facilities.
(c) - Presented net of the impact of hedging activities and includes equity volumes only.
(d) - Includes volumes fractionated from company-owned and third-party facilities.
(e) - 2010 and 2009 volume information includes 62 and 69 MBbl/d, respectively, related to Overland Pass Pipeline Company, which was deconsolidated in September 2010.

2011 vs. 2010 - Natural gas gathered decreased in 2011, compared with 2010, due to continued production declines and reduced drilling activity, primarily in the Powder River Basin in Wyoming and certain parts of Kansas, and weather-related outages in the first quarter of 2011, offset partially by increased drilling activity in the Williston Basin and western Oklahoma.

Natural gas processed and residue gas sales increased in 2011, compared with 2010, due to an increase in drilling activity in the Williston Basin and western Oklahoma, offsetting reduced drilling activity and natural production declines in Kansas and weather-related outages in the first quarter of 2011.

Natural gas transportation capacity contracted decreased due primarily to lower contracted capacity on Midwestern Gas Transmission due to narrower natural gas price location differentials between the markets we serve.

NGLs gathered and fractionated, excluding the impact of the September 2010 deconsolidation of Overland Pass Pipeline Company, increased due primarily to increased throughput through existing connections in Texas and the Mid-Continent and Rocky Mountain regions, and new supply connections in the Mid-Continent and Rocky Mountain regions.  In the second quarter 2011, additional Gulf Coast fractionation capacity became available through our 60 MBbl/d fractionation service agreement with Targa Resources Partners.

NGLs transported on distribution lines increased due primarily to increased volumes of NGL products transported on our North System pipeline to Midwest markets and our Sterling I pipeline expansion discussed above.

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2010 vs. 2009 - Natural gas gathered decreased in 2010, compared with 2009, due to continued production declines and reduced drilling activity, primarily in the Powder River Basin in Wyoming and certain parts of western Oklahoma and Kansas, offset partially by increased drilling activity in the Williston Basin.

Natural gas processed increased during 2010, compared with 2009, due to an increase in drilling activity in the Williston Basin, offsetting reduced drilling activity and natural production declines in Kansas, and reduced drilling activity in certain parts of western Oklahoma.

Natural gas transportation capacity contracted increased due primarily to increased capacity on Midwestern Gas Transmission due to a new interconnection with the Rockies Express Pipeline, Viking Gas Transmission’s Fargo lateral and Guardian Pipeline expansion and extension projects completed in 2009.

NGLs gathered, fractionated and distributed increased primarily due to new connections and increased production associated with the completion of the Arbuckle Pipeline, Piceance Lateral and D-J Basin lateral pipelines.

ONEOK Partners’ natural gas pipelines business primarily serves end-users, such as natural gas distribution companies and electric-generation companies, that require natural gas to operate their businesses regardless of price or location price differentials.  The development of shale gas and other resource plays has continued to increase available natural gas supply and has caused natural gas prices to decrease and locational and seasonal price differentials to narrow.  As additional supply is developed, ONEOK Partners expects producers to demand incremental services in the future to transport their production to market.  The abundance of shale gas supply and new regulations on emissions from coal-fired electric-generation plants also may increase the demand for our services from electric-generation companies if they were to convert to a natural gas fuel source.  Conversely, demand from certain customers that are focused on capturing location or seasonal natural gas price differentials may decrease in the future due to narrowing price differentials.  Overall, we expect our fee-based earnings to remain relatively stable in the future as the development of shale and other resource plays continue.

Natural Gas Distribution

In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  As a result, we expect to recognize a pre-tax gain of approximately $20 million to $23 million in the first quarter of 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

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Selected Financial Results - The following table sets forth certain selected financial results for the continuing operations of our Distribution segment for the periods indicated:

							Variances					Variances
	Years Ended December 31,						2011 vs. 2010					2010 vs. 2009
Financial Results	2011		2010		2009		Increase (Decrease)					Increase (Decrease)
	(Millions of dollars)
Gas sales	$	1,492.5	$	1,687.4	$	1,708.8	$	(194.9	)	(12	%)	$	(21.4	)	(1	%)
Transportation revenues		90.9		91.5		87.6		(0.6	)	(1	%)		3.9		4	%
Cost of gas		869.5		1,062.5		1,122.9		(193.0	)	(18	%)		(60.4	)	(5	%)
Net margin, excluding other revenues		713.9		716.4		673.5		(2.5	)	(0	%)		42.9		6	%
Other revenues		37.9		38.5		42.5		(0.6	)	(2	%)		(4.0	)	(9	%)
Net margin		751.8		754.9		716.0		(3.1	)	(0	%)		38.9		5	%
Operating costs		422.0		398.8		384.1		23.2		6	%		14.7		4	%
Depreciation and amortization		132.2		131.0		122.6		1.2		1	%		8.4		7	%
Gain (loss) on sale of assets		-		-		0.5		-		0	%		(0.5	)	(100	%)
Operating income	$	197.6	$	225.1	$	209.8	$	(27.5	)	(12	%)	$	15.3		7	%
Capital expenditures	$	242.6	$	215.6	$	157.5	$	27.0		13	%	$	58.1		37	%

The following table sets forth our net margin, excluding other revenues, by type of customer, for the periods indicated:

							Variances					Variances
	Years Ended December 31						2011 vs. 2010					2010 vs. 2009
Net Margin, Excluding Other Revenues	2011		2010		2009		Increase (Decrease)					Increase (Decrease)
Gas sales	(Millions of dollars)
Regulated
Residential	$	510.5	$	509.1	$	473.8	$	1.4		0	%	$	35.3		7	%
Commercial		105.5		108.9		105.1		(3.4	)	(3	%)		3.8		4	%
Industrial		2.4		2.2		2.5		0.2		9	%		(0.3	)	(12	%)
Wholesale/public authority		4.6		4.7		4.5		(0.1	)	(2	%)		0.2		4	%
Net margin on gas sales		623.0		624.9		585.9		(1.9	)	(0	%)		39.0		7	%
Transportation margin		90.9		91.5		87.6		(0.6	)	(1	%)		3.9		4	%
Net margin, excluding other revenues	$	713.9	$	716.4	$	673.5	$	(2.5	)	(0	%)	$	42.9		6	%

2011 vs. 2010 - Net margin decreased due primarily to the following:

·   a decrease of $5.9 million from lower sales in Kansas, due to lower consumption by residential and commercial customers due to warmer than normal weather in the first quarter;

·   a decrease of $4.9 million due to expiration of the Integrity Management Program (IMP) rider, which allowed us to recover certain deferred pipeline-integrity costs in Oklahoma; offset partially by

·   an increase of $3.3 million from new rates and rider recoveries in Texas;

·   an increase of $2.1 million from customer growth, primarily in Texas; and

·   an increase of $1.7 million from capital-recovery mechanisms in Kansas.

Operating costs increased due primarily to the following:

·   an increase of $14.7 million in share-based compensation costs from common stock awarded to employees as part of ONEOK’s stock award program and the appreciation in ONEOK’s share price;

·   an increase of $8.1 million of employee-related incentive and health benefit costs; and

·   an increase of $3.2 million in pension costs as a result of the annual change in our estimated discount rate.

Depreciation and amortization expense increased due primarily to an increase of $6.4 million associated with additional capital expenditures, specifically investments in automated meter reading in Oklahoma, offset partially by a decrease of $4.9 million in regulatory amortization associated with the expiration of the IMP rider, which allowed us to defer recognition of certain pipeline-integrity costs in Oklahoma.

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2010 vs. 2009 - Net margin increased due primarily to the following:

·   an increase of $40.1 million from new rates in Oklahoma that increased fixed fees, which lowered our volumetric sensitivity and provides more consistent revenues each month;

·   an increase of $6.5 million from rider recoveries in Oklahoma and ad valorem tax surcharge recoveries in Kansas;

·   an increase of $3.7 million from higher natural gas sales volumes, primarily in the first quarter of 2010, due to colder weather;

·   an increase of $3.4 million from capital-recovery mechanisms in Kansas; and

·   an increase of $2.7 million from higher transportation volumes; offset partially by

·   a decrease of $17.4 million from the expiration of the 2009 capital-recovery mechanism in Oklahoma, which as a result of our 2009 rate case in Oklahoma, the revenues related to capital recovery are now included in base rates.

Operating costs increased due primarily to an increase of $15.5 million related to the recognition of previously deferred IMP costs in Oklahoma that have been approved for recovery in our revenues.

Depreciation and amortization expense increased due primarily to an increase of $6.7 million in regulatory amortization associated with revenue rider recoveries.

Capital Expenditures - Our capital expenditures program includes expenditures for pipeline integrity, automated meter reading, extending service to new areas, modifications to customer-service lines, increasing system capabilities and replacements.  It is our practice to maintain and upgrade facilities to ensure safe, reliable and efficient operations.

Capital expenditures increased for 2011, compared with 2010, primarily as a result of increased spending on pipeline replacements in Kansas and Texas, and replacements due to highway construction in Oklahoma, offset partially by decreased spending on automated meter reading in Oklahoma.  Capital expenditures increased for 2010, compared with 2009, primarily as a result of expenditures related to an investment in automated meter reading in Oklahoma.

Selected Operating Information - The following tables set forth certain selected information for the regulated operations of our Distribution segment for the periods indicated:

	Years Ended December 31,
Number of Customers	2011		2010		2009
Residential		1,921,017		1,912,205		1,901,782
Commercial		153,227		153,650		156,337
Industrial		1,248		1,271		1,343
Wholesale/Public Authority		2,730		2,701		2,767
Transportation		11,708		11,308		10,410
Total customers		2,089,930		2,081,135		2,072,639

	Years Ended December 31,
Volumes (MMcf)	2011		2010		2009
Gas sales
Residential		117,969		121,240		120,370
Commercial		33,805		35,223		35,414
Industrial		1,367		1,211		1,208
Wholesale/Public Authority		3,287		12,060		12,705
Total volumes sold		156,428		169,734		169,697
Transportation		203,655		205,692		201,952
Total volumes delivered		360,083		375,426		371,649

Residential and commercial volumes decreased for 2011, compared with 2010, due primarily to warmer temperatures in the first quarter of 2011.  Wholesale sales represent contracted gas volumes that exceed the needs of our residential, commercial, and industrial customer base and are available for sale to other parties.  Wholesale volumes decreased for 2011, compared with 2010; however, the impact to margins was minimal.

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Regulatory Initiatives - Oklahoma - In February 2011, Oklahoma Natural Gas filed its first application related to its performance-based rate change mechanism.  The application did not seek a modification of customer rates because Oklahoma Natural Gas’ regulatory return on equity was within the range approved by the OCC.  The OCC signed the final order on this filing in July 2011, with no modification to customer rates.

In September 2010, Oklahoma Natural Gas filed an application and supporting testimony with the OCC seeking approval of a demand portfolio of conservation and energy-efficiency programs and authorizing recovery of costs and performance incentives.  A settlement agreement was reached among all the parties and filed at the OCC in February 2011.  This agreement allows Oklahoma Natural Gas to pursue the key energy-efficiency programs requested in its filing and allows the company to earn up to $1.5 million annually beginning mid-2012 if program objectives are achieved.  The filing and settlement agreement were approved by the OCC in May 2011, and billings to customers began in June 2011.

Kansas - The KCC approved the application from Kansas Gas Service to increase the Gas System Reliability Surcharge by an additional $2.9 million effective January 2012.  This surcharge is a capital-recovery mechanism that allows for rate adjustment providing recovery and a return on incremental safety-related and government-mandated capital investments made between rate cases.  We expect to file a general rate proceeding with the KCC in mid-2012.

Texas - In January 2012, the Texas Railroad Commission approved the settlement between Texas Gas Service and the City of El Paso that allows for recovery of 2010-2013 pipeline-integrity expenditures and partial recovery of rate-case expenses.  We do not expect the settlement to have a material impact on our results of operations.

In addition, Texas Gas Service has made annual filings for interim rate relief under the Gas Reliability Infrastructure Program (GRIP) statute with the cities of Austin, Texas, and surrounding communities in February 2011 and El Paso, Texas, in May 2011 for approximately $1.6 million and $1.1 million, respectively.  GRIP is a capital-recovery mechanism that allows for an interim rate adjustment providing recovery and a return on incremental capital investments made between rate cases.  In May 2011, the city of Austin approved the filing in the amount of $1.5 million, effective in June 2011.  In August 2011, the city of El Paso approved the filing in the amount of $1.0 million, effective in August 2011. 

In the normal course of business, we have filed rate cases and for GRIP and cost-of-service adjustments in various other Texas jurisdictions to address investments in rate base and changes in expense.

General - Certain costs to be recovered through the ratemaking process have been capitalized as regulatory assets.  Should recovery cease due to regulatory actions, certain of these assets may no longer meet the criteria for recognition and accordingly, a write-off of regulatory assets and stranded costs may be required.  There were no write-offs of regulatory assets resulting from the failure to meet the criteria for capitalization during 2011, 2010 or 2009.

Energy Services

Selected Financial Results - The following table sets forth certain selected financial results for our Energy Services segment for the periods indicated:

							Variances					Variances
	Years Ended December 31,						2011 vs. 2010					2010 vs. 2009
Financial Results	2011		2010		2009		Increase (Decrease)					Increase (Decrease)
	(Millions of dollars)
Revenues	$	2,777.2	$	3,301.2	$	3,553.6	$	(524.0	)	(16	%)	$	(252.4	)	(7	%)
Cost of sales and fuel		2,728.5		3,141.5		3,394.0		(413.0	)	(13	%)		(252.5	)	(7	%)
Net margin		48.7	159.7			159.6		(111.0	)	(70	%)		0.1		0	%
Operating costs		24.5		28.4		35.5		(3.9	)	(14	%)		(7.1	)	(20	%)
Depreciation and amortization		0.4		0.6		0.5		(0.2	)	(33	%)		0.1		20	%
Operating income	$	23.8	$	130.7	$	123.6	$	(106.9	)	(82	%)	$	7.1		6	%

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The following table sets forth our margins by activity for the periods indicated:

							Variances					Variances
	Years Ended December 31,						2011 vs. 2010					2010 vs. 2009
	2011		2010		2009		Increase (Decrease)					Increase (Decrease)
	(Millions of dollars)
Marketing, storage and transportation revenues, gross	$	208.0	$	342.9	$	367.7	$	(134.9	)	(39	%)	$	(24.8	)	(7	%)
Storage and transportation costs		161.2		189.4		211.2		(28.2	)	(15	%)		(21.8	)	(10	%)
Marketing, storage and transportation, net		46.8		153.5		156.5		(106.7	)	(70	%)		(3.0	)	(2	%)
Financial trading, net		1.9		6.2		3.1		(4.3	)	(69	%)		3.1		100	%
Net margin	$	48.7	$	159.7	$	159.6	$	(111.0	)	(70	%)	$	0.1		0	%

In accordance with our strategy to better align fixed costs with the current business environment, we reduced our leased transportation capacity in 2011.  Our storage and transportation costs decreased 15 percent in 2011 compared with 2010, primarily due to this transportation capacity reduction.  For additional information on transportation capacity refer to “Selected Operating Information” below.

Marketing, storage and transportation revenues, gross, primarily includes marketing, purchases and sales, premium services and the impact of cash flow and fair value hedges and other derivative instruments used to manage our risk associated with these activities.  Storage and transportation costs primarily include the cost of leasing capacity, storage injection and withdrawal fees, fuel charges and gathering fees.  Risk management and operational decisions have an impact on the net result of our marketing, premium services and storage activities.  We evaluate our strategies on an ongoing basis to optimize the value of our contracted assets and to minimize the financial impact of market conditions on the services we provide.

Financial trading, net, includes activities that are executed generally using financially settled derivatives.  These activities are normally short term in nature, with a focus on capturing short-term price volatility.  Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties.  Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

2011 vs. 2010 - The factors discussed in Energy Services’ “Narrative Description of the Business” included in Item I, Business, of this Annual Report have led to a significant decrease in net margin, including:

·   a decrease of $65.3 million in transportation margins, net of hedging, due primarily to narrower price location differentials and lower hedge settlements in 2011;

·   a decrease of $34.3 million in storage and marketing margins, net of hedging activities, due primarily to the following:

-   lower realized seasonal storage price differentials; offset partially by

-   favorable marketing activity and unrealized fair value changes on nonqualifying economic storage hedges;

·   a decrease of $7.3 million in premium-services margins, associated primarily with the reduction in the value of the fees collected for these services as a result of low commodity prices and reduced natural gas price volatility in the first quarter of 2011 compared with the first quarter of 2010; and

·   a decrease of $4.3 million in financial trading margins, as low natural gas prices and reduced natural gas price volatility limited our financial trading opportunities.

Additionally, our net margin includes $91.1 million in adjustments to natural gas inventory reflecting the lower of cost or market value.  Because of the adjustments to our inventory value, we reclassified $91.1 million of deferred gains on associated cash flow hedges into earnings.

Operating costs decreased due primarily to a decrease in ad valorem taxes.

2010 vs. 2009 - Net margin was relatively unchanged but reflects the following:

·   an increase of $39.7 million in storage and marketing margins, net of hedging activities, due primarily to the following:

-   higher realized seasonal storage price differentials and a decrease in storage expense due to the reduction in storage capacity; offset partially by

-   a reduction in storage withdrawals due to decreased natural gas storage capacity under lease; and

-   unfavorable unrealized fair-value changes on nonqualifying economic hedge activity and marketing margins; and

·   an increase of $3.1 million in financial trading margins; offset by

·   a decrease of $21.4 million in transportation margins, net of hedging, due primarily to narrower realized Mid-Continent-to-Gulf Coast price differentials; and

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·   a decrease of $21.3 million in premium-services margins, associated primarily with lower demand fees as a result of lower volatility of natural gas prices, offset partially by the favorable management of customer-peaking requirements resulting from warmer weather in the fourth quarter of 2010, compared with the same period in 2009.

Additionally, our net margin includes $58.7 million in adjustments to natural gas inventory reflecting the lower of cost or market value.  Because of the adjustments to our inventory value, we reclassified $58.7 million of deferred gains on associated cash flow hedges into earnings.

Operating costs decreased due primarily to a decrease in legal-related costs and ad valorem taxes.

Selected Operating Information - The following table sets forth certain selected operating information for our Energy Services segment for the periods indicated:

	Years Ended December 31,
Operating Information	2011		2010		2009
Natural gas marketed (Bcf)		845		919		1,105
Natural gas gross margin ($/Mcf)	$	0.06	$	0.18	$	0.15
Physically settled volumes (Bcf)		1,724		1,874		2,217

Natural gas volumes marketed and physically settled volumes decreased in both 2011 and 2010 due primarily to reduced transportation capacity and lower transported volumes.  Transportation capacity in certain markets was not utilized due to the economics of the location differentials as a result of increased supply of natural gas, primarily from shale production and increased pipeline capacity as a result of pipeline construction.

Our natural gas in storage at December 31, 2011, was 70.5 Bcf, compared with 63.0 Bcf at December 31, 2010.  At December 31, 2011, our total natural gas storage capacity under lease was 75.6 Bcf, compared with 73.6 Bcf at December 31, 2010.  At December 31, 2011, our natural gas storage capacity under lease had a maximum withdrawal capability of 2.4 Bcf/d and maximum injection capability of 1.3 Bcf/d.  At December 31, 2011, our natural gas transportation capacity was 1.2 Bcf/d, of which 1.1 Bcf/d was contracted under long-term natural gas transportation contracts, compared with 1.4 Bcf/d of total capacity and 1.1 Bcf/d of long-term capacity at December 31, 2010.

Although our intent is to reduce our natural gas storage capacity, we had an increase in the capacity under lease at December 31, 2011, compared with December 31, 2010, as a result of new capacity that was committed to in prior years.  Reducing both storage and transportation capacity will continue to be a focus as we continue to attempt to reduce fixed costs because of the current business environment.  It is possible that we may recognize charges to our earnings as a result of certain of these actions.

CONTINGENCIES

Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations.  While the results of litigation and claims cannot be predicted with certainty, and we are unable to estimate reasonably possible losses, we believe the probable final outcome of such matters will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.  Additional information about our legal proceedings is included under Part I, Item 3, Legal Proceedings, in this Annual Report.

LIQUIDITY AND CAPITAL RESOURCES

General - ONEOK and ONEOK Partners have relied primarily on operating cash flow, commercial paper, bank credit facilities, debt issuances and/or the issuance of equity for their liquidity and capital resource requirements.  ONEOK and ONEOK Partners fund operating expenses, debt service, dividends to shareholders and distributions to unitholders primarily with operating cash flow.  Capital expenditures are funded by short- and long-term debt, issuances of equity and operating cash flow.  We expect to continue to use these sources for our liquidity and capital resource needs.  Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments to unaffiliated parties, and ONEOK does not guarantee the debt or other similar commitments of ONEOK Partners.

In 2011, ONEOK and ONEOK Partners accessed the commercial paper markets to meet their short-term liquidity needs.  Additionally, ONEOK Partners accessed the public debt markets in January 2011 for its long-term financing needs.  See discussion below under “ONEOK Partners’ Debt Issuance and Maturities” for more information.

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ONEOK’s and ONEOK Partners’ ability to continue to access capital markets for debt and equity financing under reasonable terms depends on market conditions and ONEOK’s and ONEOK Partners’ respective financial condition and credit ratings.  We anticipate that our cash flow generated from operations, existing capital resources, including proceeds from the issuance of our $700 million 4.25-percent senior notes issued in January 2012, and distributions from ONEOK Partners will enable us to maintain our current and planned level of operations and fund the remainder of our three-year, $750-million stock repurchase program.  ONEOK Partners anticipates that its cash flow generated from operations, existing capital resources and ability to obtain financing will enable it to maintain its current and planned level of operations.  Additionally, ONEOK Partners expects to fund its future capital expenditures with short- and long-term debt, the issuance of equity and operating cash flows.

Capitalization Structure - The following table sets forth our consolidated capitalization structure for the periods indicated:

	December 31,	December 31,
	2011	2010
Long-term debt	56%	52%
Total equity	44%	48%
Debt (including notes payable)	60%	55%
Total equity	40%	45%

For purposes of determining compliance with financial covenants in the ONEOK 2011 Credit Agreement, which are described below, the debt of ONEOK Partners is excluded.  The following table sets forth ONEOK’s capital structure, excluding the debt of ONEOK Partners, for the periods indicated:

	December 31,	December 31,
	2011	2010
Long-term debt	31%	38%
ONEOK shareholders' equity	69%	62%
Debt (including notes payable)	45%	40%
ONEOK shareholders' equity	55%	60%

Stock Repurchase Program - In 2011, we repurchased approximately 4.3 million shares of our common stock for approximately $300 million pursuant to an accelerated stock repurchase agreement.  The stock repurchase was part of our three-year stock repurchase program to buy up to $750 million of our common stock that was authorized by our Board of Directors in October 2010.

Cash Management - ONEOK and ONEOK Partners each use similar centralized cash management programs that concentrate the cash assets of their operating subsidiaries in joint accounts for the purpose of providing financial flexibility and lowering the cost of borrowing, transaction costs and bank fees.  Both centralized cash management programs provide that funds in excess of the daily needs of the operating subsidiaries are concentrated, consolidated or otherwise made available for use by other entities within the respective consolidated groups.  ONEOK Partners’ operating subsidiaries participate in these programs to the extent they are permitted pursuant to FERC regulations or their operating agreements.  Under these cash management programs, depending on whether a participating subsidiary has short-term cash surpluses or cash requirements, ONEOK and ONEOK Partners provide cash to their respective subsidiaries or the subsidiaries provide cash to them. 

Short-term Liquidity - ONEOK’s principal sources of short-term liquidity consist of cash generated from operating activities, quarterly distributions from ONEOK Partners and the issuance of commercial paper.  ONEOK Partners’ principal sources of short-term liquidity consist of cash generated from operating activities, the issuance of its commercial paper program and distributions received from unconsolidated affiliates.  To the extent commercial paper is unavailable, ONEOK’s and ONEOK Partners’ respective revolving credit agreements may be utilized.

ONEOK 2011 Credit Agreement -In April 2011, ONEOK entered into the five-year, $1.2 billion ONEOK 2011 Credit Agreement, which replaced the $1.2 billion ONEOK Credit Agreement that was scheduled to expire in July 2011.  The ONEOK 2011 Credit Agreement, which is scheduled to expire in April 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining ONEOK’s stand-alone debt-to-capital ratio of no more than 67.5 percent at the end of any calendar quarter, limitations on the ratio of indebtedness secured by liens and indebtedness of subsidiaries to consolidated net tangible assets, a requirement that ONEOK maintains the power to control the management and policies of ONEOK Partners, and a limit on new investments in master limited partnerships.

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The ONEOK 2011 Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, investments, fundamental changes in the nature of ONEOK’s businesses, transactions with affiliates, the use of proceeds and a covenant that limits ONEOK’s ability to restrict its subsidiaries’ ability to pay dividends.  Under the terms of the ONEOK 2011 Credit Agreement, ONEOK may request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The debt covenant calculations in the ONEOK 2011 Credit Agreement exclude the debt of ONEOK Partners.  Upon breach of certain covenants by ONEOK, amounts outstanding under the ONEOK 2011 Credit Agreement may become due and payable immediately.  At December 31, 2011, ONEOK’s stand-alone debt-to-capital ratio, as defined by the ONEOK 2011 Credit Agreement, was 44.4 percent, and ONEOK was in compliance with all covenants under the ONEOK 2011 Credit Agreement.

The total amount of short-term borrowings authorized by ONEOK’s Board of Directors is $2.8 billion.  At December 31, 2011, ONEOK had $842.0 million of commercial paper outstanding, $2.0 million in letters of credit issued under the ONEOK 2011 Credit Agreement and approximately $30.9 million of cash and cash equivalents.  ONEOK had approximately $356.0 million of credit available at December 31, 2011, under the ONEOK 2011 Credit Agreement.  As of December 31, 2011, ONEOK could have issued $3.1 billion of additional short- and long-term debt under the most restrictive provisions contained in its various borrowing agreements.

The ONEOK 2011 Credit Agreement is available to repay our commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK 2011 Credit Agreement.  The ONEOK 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating.  Borrowings, if any, will accrue at LIBOR plus 150 basis points, and the annual facility fee is 25 basis points based on our current credit rating.

ONEOK Partners 2011 Credit Agreement - In August 2011, ONEOK Partners entered into the five-year, $1.2 billion ONEOK Partners 2011 Credit Agreement, which replaced the $1.0 billion ONEOK Partners Credit Agreement that was due to expire in March 2012.  The ONEOK Partners 2011 Credit Agreement, which is scheduled to expire in August 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in the ONEOK Partners 2011 Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1.  If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will be increased to 5.5 to 1 for the three calendar quarters following the acquisition.  Upon breach of certain covenants by ONEOK Partners in the ONEOK Partners 2011 Credit Agreement, amounts outstanding under the ONEOK Partners 2011 Credit Agreement, if any, may become due and payable immediately.

The ONEOK Partners 2011 Credit Agreement includes a $100-million sublimit for the issuance of standby letters of credit and also features an option to request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The ONEOK Partners 2011 Credit Agreement is available to repay ONEOK Partners’ commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK Partners 2011 Credit Agreement.  The ONEOK Partners 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in ONEOK Partners’ credit rating.  Borrowings, if any, will accrue at LIBOR plus 130 basis points, and the annual facility fee is 20 basis points based on ONEOK Partners’ current credit rating.  The ONEOK Partners 2011 Credit Agreement is guaranteed fully and unconditionally by ONEOK Partners’ wholly owned subsidiary, ONEOK Partners Intermediate Limited Partnership.  Borrowings under the ONEOK Partners 2011 Credit Agreement are nonrecourse to ONEOK.

The total amount of short-term borrowings authorized by the Board of Directors of ONEOK Partners GP, the general partner of ONEOK Partners, is $2.5 billion.  At December 31, 2011, ONEOK Partners had no commercial paper outstanding, no letters of credit issued, no borrowings outstanding under the ONEOK Partners 2011 Credit Agreement, approximately $35.1 million of cash and $1.2 billion of credit available under the ONEOK Partners 2011 Credit Agreement.  As of December 31, 2011, ONEOK Partners could have issued $3.5 billion of short- and long-term debt to meet its liquidity needs under the most restrictive provisions contained in its various borrowing agreements.

At December 31, 2011, ONEOK Partners’ ratio of indebtedness to adjusted EBITDA was 2.9 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners 2011 Credit Agreement.

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At December 31, 2011, the weighted-average interest rate on ONEOK’s short-term debt outstanding was 0.50 percent.  The weighted-average interest rates for the year ended December 31, 2011, on ONEOK’s and ONEOK Partners’ short-term borrowings were 0.29 percent and 0.37 percent, respectively.  Based on the forward LIBOR curve, we expect the interest rates on ONEOK’s and ONEOK Partners’ short-term borrowings to increase in 2012, compared with interest rates on amounts outstanding at December 31, 2011.

Long-term Financing - In addition to the principal sources of short-term liquidity discussed above, ONEOK expects to fund its longer-term cash requirements by issuing equity or long-term notes.  ONEOK Partners expects to fund its longer-term cash requirements by issuing common units or long-term notes.  Other options to obtain financing include, but are not limited to, issuance of convertible debt securities, asset securitization and the sale and leaseback of facilities.

ONEOK and ONEOK Partners are subject to changes in the debt and equity markets, and there is no assurance they will be able or willing to access the public or private markets in the future.  ONEOK and ONEOK Partners may choose to meet their cash requirements by utilizing some combination of cash flows from operations, borrowing under existing commercial paper  or credit facilities, altering the timing of controllable expenditures, restricting future acquisitions and capital projects, or pursuing other debt or equity financing alternatives.  Some of these alternatives could involve higher costs or negatively affect their respective credit ratings, among other factors.  Based on ONEOK’s and ONEOK Partners’ investment-grade credit ratings, general financial condition and market expectations regarding their future earnings and projected cash flows, ONEOK and ONEOK Partners believe that they will be able to meet their respective cash requirements and maintain their investment-grade credit ratings.

ONEOK Debt Issuance - In January 2012, we completed an underwritten public offering of $700 million of 4.25-percent senior notes due 2022.  The net proceeds from the offering, after deducting underwriting discounts and offering expenses, of approximately $693.9 million were used to repay amounts outstanding under our commercial paper program.  We will pay interest on the senior notes due 2022 on February 1 and August 1 of each year, beginning August 1, 2012.

ONEOK Debt Repayments - In 2011, ONEOK repaid $400 million of maturing senior notes and redeemed $90.5 million of 6.4-percent senior notes with available cash and short-term borrowings.

ONEOK Debt Covenants - The indentures governing ONEOK’s senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK’s senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK’s existing and future unsecured senior indebtedness.

ONEOK Partners’ Debt Issuance and Maturities- In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041.  The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

ONEOK Partners intends to repay its $350 million of 5.9-percent senior notes that mature in April 2012 with a combination of cash on hand and short-term borrowings.

ONEOK Partners’ Debt Covenants - The indentures governing ONEOK Partners’ senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners’ outstanding senior notes to declare those senior notes immediately due and payable in full.

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ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and senior notes due 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners’ senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners’ existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners’ senior notes are nonrecourse to ONEOK.

Interest-rate Swaps - At December 31, 2011, ONEOK and ONEOK Partners had forward-starting interest-rate swaps with notional amounts of $500 million and $750 million, respectively.  The purpose of the swaps is to hedge the variability of interest payments on a portion of forecasted debt issuances that may result from changes in the benchmark interest rate before the debt is issued.  In January 2012, ONEOK entered into an additional interest-rate swap that was designated as a cash flow hedge with a notional amount of $200 million.  Upon issuance in January 2012 of our $700 million of 4.25-percent senior notes due 2022, ONEOK settled its swaps and realized a loss of $44.1 million that will be amortized to interest expense over the term of the debt.

Capital Expenditures - ONEOK’s and ONEOK Partners’ capital expenditures are financed typically through operating cash flows, short- and long-term debt and the issuance of equity.  Capital expenditures were $1,336.1 million, $582.7 million and $791.2 million for 2011, 2010 and 2009, respectively, exclusive of acquisitions.  Of these amounts, ONEOK Partners’ capital expenditures were $1,063.4 million, $352.7 million and $615.7 million for 2011, 2010 and 2009, respectively, exclusive of acquisitions.  Capital expenditures for 2011 increased, compared with 2010, due primarily to the growth projects in ONEOK Partners’ natural gas gathering and processing and natural gas liquids businesses.

The following table sets forth our 2012 projected capital expenditures, excluding AFUDC:

2012 Projected Capital Expenditures
	(Millions of dollars)
ONEOK Partners	$	1,969
Natural Gas Distribution		270
Other		32
Total projected capital expenditures	$	2,271

Unconsolidated Affiliates - The Overland Pass Pipeline Company limited liability company agreement provides that distributions to Overland Pass Pipeline Company’s members are to be made on a pro-rata basis according to each member’s ownership interest.  The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions.  Any changes to, or suspension of, cash distributions from Overland Pass Pipeline Company requires the unanimous approval of the Overland Pass Pipeline Management Committee.  Cash distributions are equal to 100 percent of available cash as defined in the limited liability company agreement.

The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline’s partners are to be made on a pro-rata basis according to each partner’s percentage interest.  The Northern Border Pipeline Management Committee determines the amount and timing of such distributions.  Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee.  Cash distributions are equal to 100 percent of distributable cash flow as determined from Northern Border Pipeline’s financial statements based upon EBITDA, less interest expense and maintenance capital expenditures.  Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement.  The Northern Border Pipeline Management Committee has adopted a cash distribution policy related to financial ratio targets and capital contributions.  The cash distribution policy defines minimum equity-to-total-capitalization ratios to be used by the Northern Border Pipeline Management Committee to establish the timing and amount of required capital contributions.  In addition, any shortfall due to the inability to refinance maturing debt will be funded by capital contributions.

Credit Ratings - Our credit ratings as of December 31, 2011, are shown in the table below:

	ONEOK		ONEOK Partners
Rating Agency	Rating	Outlook	Rating	Outlook
Moody’s	Baa2	Stable	Baa2	Stable
S&P	BBB	Stable	BBB	Stable

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ONEOK’s and ONEOK Partners’ commercial paper programs are each rated Prime-2 by Moody’s and A2 by S&P.  ONEOK’s and ONEOK Partners’ credit ratings, which currently are investment grade, may be affected by a material change in financial ratios or a material event affecting the business.  The most common criteria for assessment of credit ratings are the debt-to-capital ratio, business risk profile, pretax and after-tax interest coverage, and liquidity.  ONEOK and ONEOK Partners currently do not anticipate their respective credit ratings to be downgraded.  However, if ONEOK’s or ONEOK Partners’ credit ratings were downgraded, the cost to borrow funds under their respective commercial paper programs and credit agreements would increase, and ONEOK or ONEOK Partners potentially could lose access to the commercial paper market.  In the event that ONEOK is unable to borrow funds under its commercial paper program and there has not been a material adverse change in its business, ONEOK would continue to have access to the ONEOK 2011 Credit Agreement, which expires in April 2016.  In the event that ONEOK Partners is unable to borrow funds under its commercial paper program and there has not been a material adverse change in its business, ONEOK Partners would continue to have access to the ONEOK Partners 2011 Credit Agreement, which expires in August 2016.  An adverse rating change alone is not a default under the ONEOK 2011 Credit Agreement or the ONEOK Partners 2011 Credit Agreement.

Our Energy Services segment relies upon the investment-grade rating of ONEOK’s senior unsecured long-term debt to reduce its collateral requirements.  If ONEOK’s credit ratings were to decline below investment grade, our ability to participate in energy marketing and trading activities could be significantly limited.  Without an investment-grade rating, we may be required to fund margin requirements with our counterparties with cash, letters of credit or other negotiable instruments.  At December 31, 2011, ONEOK could have been required to fund approximately $5.9 million in margin requirements related to financial contracts upon such a downgrade.  A decline in ONEOK’s credit rating below investment grade also may impact significantly other business segments.

In the normal course of business, ONEOK’s and ONEOK Partners’ counterparties provide secured and unsecured credit.  In the event of a downgrade in ONEOK’s or ONEOK Partners’ credit ratings or a significant change in ONEOK’s or ONEOK Partners’ counterparties’ evaluation of our creditworthiness, ONEOK or ONEOK Partners could be required to provide additional collateral in the form of cash, letters of credit or other negotiable instruments as a condition of continuing to conduct business with such counterparties.

Commodity Prices - We are subject to commodity price volatility.  Significant fluctuations in commodity prices will impact our overall liquidity due to the impact commodity price changes have on our cash flows from operating activities, including the impact on working capital for NGLs and natural gas held in storage, margin requirements and certain energy-related receivables.  We believe that ONEOK’s and ONEOK Partners’ available credit and cash and cash equivalents are adequate to meet liquidity requirements associated with commodity price volatility.  See discussion beginning on page 68 under “Commodity Price Risk” in Item 7A, Quantitative and Qualitative Disclosures about Market Risk, for information on our hedging activities.

Pension and Postretirement Benefit Plans - Information about our pension and postretirement benefits plans, including anticipated contributions, is included under Note M of the Notes to Consolidated Financial Statements in this Annual Report.

During 2011, we made contributions of $62.6 million and $11.5 million to our defined benefit pension plans and postretirement benefit plans, respectively.  Our 2011 contributions to our defined benefit pension plans are attributable to the 2012 plan year.  During the first quarter of 2012, we made a contribution of $60.0 million to our defined benefit pension plan attributable to the 2013 plan year.  We do not anticipate that we will be required to make additional material defined benefit pension plan contributions in 2012.  We anticipate our 2012 contributions for our postretirement benefit plans will be approximately $10.7 million.  The expected 2012 benefit payments for our postretirement benefit plans are estimated to be $16.4 million.

CASH FLOW ANALYSIS

We use the indirect method to prepare our Consolidated Statements of Cash Flows.  Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that impact net income but may not result in actual cash receipts or payments during the period.  These reconciling items include depreciation and amortization, allowance for equity funds used during construction, gain or loss on sale of assets, equity earnings from investments, distributions received from unconsolidated affiliates, deferred income taxes, share-based compensation expense, other amounts, and changes in our assets and liabilities not classified as investing or financing activities.

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The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Millions of dollars)
Total cash provided by (used in):
Operating activities	$	1,360.0		$	834.0		$	1,452.7
Investing activities		(1,371.6	)		(134.3	)		(787.8	)
Financing activities		55.4			(698.1	)		(1,145.6	)
Change in cash and cash equivalents		43.8			1.6			(480.7	)
Change in cash and cash equivalents included in discontinued operations		(8.2	)		(2.2	)		15.6
Change in cash and cash equivalents from continuing operations		35.6			(0.6	)		(465.1	)
Cash and cash equivalents at beginning of period		30.4			30.9			496.0
Cash and cash equivalents at end of period	$	66.0		$	30.3		$	30.9

Operating Cash Flows - Operating cash flows are affected by earnings from our business activities.  Changes in commodity prices and demand for our services or products, whether because of general economic conditions, changes in supply, changes in demand for the end products that are made with our products or increased competition from other service providers, could affect our earnings and operating cash flows.

2011 vs. 2010 - Cash flows from operating activities, before changes in operating assets and liabilities, were $1,397.7 million for 2011, compared with $994.9 million for 2010.  The increase was due primarily to changes in net margin and operating expenses discussed in Financial Results and Operating Information on page 42.

The changes in operating assets and liabilities decreased operating cash flows $37.7 million for 2011, compared with a decrease of $160.9 million for 2010.  The change was due primarily to the collection and payment of trade receivables and payables, resulting from the timing of invoices collected from customers and paid to vendors and suppliers, which vary from period to period; and a decrease in volumes of NGLs in storage in our ONEOK Partners segment in the current period, compared with an increase in volumes in storage in our ONEOK Partners segment in the same period last year.

2010 vs. 2009 - Cash flows from operating activities, before changes in operating assets and liabilities, were $994.9 million for 2010, compared with $974.3 million for 2009.  The increase was due primarily to changes in net margin and operating expenses discussed in Financial Results and Operating Information on page 42.

The changes in operating assets and liabilities decreased operating cash flows $160.9 million for 2010, compared with an increase of $478.4 million for 2009, primarily as a result of the impact of commodity prices on our operating assets and liabilities and an increase in volumes of commodities in storage primarily in our Natural Gas Distribution segment and ONEOK Partners’ natural gas liquids business.

Investing Cash Flows - Cash used in investing activities increased for 2011, compared with cash used in investing activities for the same period in 2010, due primarily to ONEOK Partners’ growth projects in its natural gas gathering and processing and natural gas liquids businesses and the $423.7 million in proceeds ONEOK Partners received from the Overland Pass Pipeline transaction in September 2010.

Financing Cash Flows - Cash provided by financing activities increased for 2011 compared with 2010.  The change is a result of ONEOK Partners’ January 2011 debt issuance, a portion of the proceeds from which were used to repay ONEOK Partners’ short-term borrowings and the March 2011 maturity of a portion of ONEOK Partners’ long-term debt.  The net cash flows provided by these financing activities were offset partially by the repayment of a scheduled maturity of ONEOK’s long-term debt, ONEOK’s $300 million share repurchase in May 2011, increased distributions to noncontrolling interests and increased dividends.

Cash used in financing activities decreased for 2010, compared with the 2009, due primarily to decreased borrowings resulting from the completion of ONEOK Partners’ capital projects in 2009, ONEOK Partners’ repayment of $250 million of maturing senior notes in 2010, an increase of approximately 12.0 percent in dividends paid during 2010, an increase of approximately 3.0 percent in cash distributions per unit paid to noncontrolling interests and additional ONEOK Partners common units, offset partially by increased net proceeds generated from ONEOK Partners’ common unit offering in 2010.

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REGULATORY AND ENVIRONMENTAL MATTERS

Environmental Matters -We are subject to multiple historical and wildlife preservation laws and environmental regulations affecting many aspects of our present and future operations.  Regulated activities include those involving air emissions; storm water and wastewater discharges; handling and disposal of solid and hazardous wastes; hazardous materials transportation; and pipeline and facility construction.  These laws and regulations require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals.  Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations.  If a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including response, investigation and cleanup costs, which could affect materially our results of operations and cash flows.  In addition, emission controls required under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria.  Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions.  The rule was phased in beginning January 2011 and, at current emission threshold levels, will have a minimal impact on our existing facilities.  The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities; however, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA issued a proposed rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, with a compliance date in 2013.  The rule will require capital expenditures over the next three years for the purchase and installation of new emissions-control equipment.  We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

Additional information about our environmental matters is included in “Environmental and Safety Matters” of Item 1, Business and Note Q of the Notes to Consolidated Financial Statements in this Annual Report.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations.  Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters did not have a material impact on earnings or cash flows during 2011, 2010 and 2009.

Financial Markets Legislation - The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets.  Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act.  Although the CFTC has issued final regulations for certain provisions of the Dodd-Frank Act, many remain outstanding.  In November 2011, the CFTC published final rules on speculative position limits, which we do not expect to impact directly our current risk-management practices.  In December 2011, the CFTC issued an order that further defers the effective date of the provisions of the Dodd-Frank Act that require a rulemaking, such as definitions of certain terms, until the earlier of the effective date of the final rule defining the reference terms or July 16, 2012.  Until the remaining final regulations are established, we are unable to ascertain how we may be affected by them.  Based on our assessment of the regulations issued to date and those proposed, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation.  We also may incur additional costs associated with our compliance with the new regulations and anticipated additional record keeping, reporting and disclosure obligations; however, we do not believe the costs will be material.  These requirements could affect adversely market liquidity and pricing of derivative contracts making it more difficult to execute our risk-management strategies in the future.  Also, the anticipated increased costs of compliance by dealers and counterparties likely will be passed on to customers, which could decrease the benefits of hedging to us and could reduce our profitability and liquidity.

Other - Several regulatory initiatives impacted the earnings and future earnings potential for our Natural Gas Distribution segment.  See discussion of our Natural Gas Distribution segment’s regulatory initiatives beginning on page 52.

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IMPACT OF NEW ACCOUNTING STANDARDS

Information about the impact of new accounting standards is included in Note A of the Notes to Consolidated Financial Statements in this Annual Report.

ESTIMATES AND CRITICAL ACCOUNTING POLICIES

The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements.  These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period.  Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

The following is a summary of our most critical accounting policies, which are defined as those estimates and policies most important to the portrayal of our financial condition and results of operations and requiring management’s most difficult, subjective or complex judgment, particularly because of the need to make estimates concerning the impact of inherently uncertain matters.  We have discussed the development and selection of our estimates and critical accounting policies with the Audit Committee of our Board of Directors.

Fair Value Measurements -We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  Inputs into our fair value estimates include commodity exchange prices, over-the-counter quotes, volatility, historical correlations of pricing data and LIBOR and other liquid money-market instrument rates.  We also utilize internally developed basis curves that incorporate observable and unobservable market data.  We validate our valuation inputs with third-party information and settlement prices from other sources, where available.  In addition, as prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  We also take into consideration the potential impact on market prices of liquidating positions in an orderly manner and over a reasonable period of time using current market conditions.  We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using specific and sector bond yields and also monitoring the credit default swap markets.  Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be material.

The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value.  The levels of the hierarchy are described below:

·   Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;

·   Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date.  Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and

·   Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate.  These unobservable inputs are developed based on the best information available and may include our own internal data.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data.  Transfers in and out of Level 3 typically result from derivatives for which fair value is determined based on multiple inputs.  If prices change for a particular input from the previous measurement date to the current measurement date, the impact could result in the derivative being moved between Level 2 and Level 3, depending upon management’s judgment of the significance of the price change of that particular input to the total fair value of the derivative.  

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For more information on our fair value measurements, fair value sensitivity and a discussion of the market risk of pricing changes, see Item 7A, Quantitative and Qualitative Disclosures about Market Risk and Note C of the Notes to Consolidated Financial Statements in this Annual Report.

Derivatives, Accounting for Financially Settled Transactions and Risk - Management Activities - We engage in wholesale energy marketing, trading and risk-management activities.  We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.

Market value changes result in a change in the fair value of our derivative instruments.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the nature of the risk being hedged and how effective the hedging instrument is.  When possible, we implement effective hedging strategies using derivative instruments that qualify as hedges for accounting purposes.  If the derivative instrument does not qualify or is not designated as part of a hedging relationship, then we account for changes in fair value of the derivative in earnings as they occur.  Commodity price volatility may have a significant impact on the gain or loss in any given period.

To reduce our exposure to fluctuations in natural gas, NGLs and condensate prices, we periodically enter into futures, forwards, options or swap transactions in order to hedge anticipated purchases and sales of natural gas, NGLs and condensate and fuel requirements.  Interest-rate swaps are also used to manage interest-rate risk.  Under certain conditions, we designate these derivative instruments as a hedge against our exposure to changes in fair values or cash flow.  For hedges of exposure to changes in cash flow, the effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss) and is subsequently recorded to earnings when the forecasted transaction affects earnings.  Any ineffectiveness of designated hedges is reported in earnings during the period the ineffectiveness occurs.  However, if a derivative instrument is ineligible for hedge accounting or if the cash flow hedge is not properly designated, changes in fair value of the derivative instrument would be recorded currently in earnings.  Additionally, if a cash flow hedge ceases to qualify for hedge accounting treatment because it is no longer probable that the forecasted transaction will occur, the change in fair value of the derivative instrument would be recognized in earnings.

For hedges against our exposure in changes in fair value, the gain or loss on the derivative instrument is recognized in earnings during the period of change together with the offsetting gain or loss on the hedged item attributable to the risk being hedged.  We do not believe that changes in our fair value estimates of our derivative instruments have a material impact on our results of operations as the majority of our derivatives are accounted for as hedges for which ineffectiveness is not material.  We assess the effectiveness of hedging relationships quarterly by performing an effectiveness test on our hedging relationships to determine whether they are highly effective on a retrospective and prospective basis.

Upon election, many of our purchase and sale agreements that result in physical delivery and that otherwise would be required to follow the accounting for derivative instruments qualify as normal purchases and normal sales exceptions and are therefore exempt from fair value accounting treatment.

For more information on our derivatives and risk management activities, fair value sensitivity and a discussion of the market risk of pricing changes, see Item 7A, Quantitative and Qualitative Disclosures about Market Risk and Note D of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill and indefinite-lived intangible assets for impairment at least annually as of July 1.  There were no impairment charges resulting from our 2011, 2010 or 2009 impairment tests.  As part of our impairment test, an initial assessment is made by comparing the fair value of a reporting unit with its book value, including goodwill.  If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the impairment.  In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets of the reporting unit from the fair value determined in step one of the assessment.  If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective.  Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates.  Under the market approach, we apply multiples to forecasted cash flows.  The multiples used are consistent with historical asset transactions.  The forecasted cash flows are based on average forecasted cash flows over a period of years.

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As part of our indefinite-lived intangible asset impairment test, we compare the estimated fair value of our indefinite-lived intangible assets with their book values.  The fair value of our indefinite-lived intangible assets is estimated using the market approach.  Under the market approach, we apply multiples to forecasted cash flows of the assets associated with our indefinite-lived intangible assets.  The multiples used are consistent with historical asset transactions.  We determined that there were no impairments to our indefinite-lived intangible asset in 2011, 2010 or 2009.

We assess our long-lived assets, including intangible assets with finite useful lives, for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable.  An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset.  If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.  We determined that there were no asset impairments in 2011, 2010 or 2009.

For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary.  Therefore, we periodically reevaluate the amount at which we carry our equity method investments to determine whether current events or circumstances warrant adjustments to our carrying value.  We determined that there were no impairments to our investments in unconsolidated affiliates in 2011, 2010 or 2009.

Our impairment tests require the use of assumptions and estimates such as industry economic factors and the profitability of future business strategies.  If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Notes E and F for our goodwill and long-lived assets disclosures.

Pension and Postretirement Employee Benefits - We have defined benefit retirement plans covering certain full-time employees.  We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  Our actuarial consultant calculates the expense and liability related to these plans and uses statistical and other factors that attempt to anticipate future events.  These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and employment periods.  In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the costs and liabilities we recognize.  See Note M of the Notes to Consolidated Financial Statements in this Annual Report for additional information.

Assumed health care cost-trend rates have a significant effect on the amounts reported for our health care plans.  A one percentage point change in assumed health care cost trend rates would have the following effects.

	One Percentage		One Percentage
	Point Increase		Point Decrease
	(Thousands of dollars)
Effect on total of service and interest cost	$	1,833	$	(1,559	)
Effect on postretirement benefit obligation	$	17,562	$	(16,079	)

During 2011, we recorded net periodic benefit costs of $40.0 million related to our defined benefit pension plans and $19.1 million related to postretirement benefits.  We estimate that in 2012, we will record net periodic benefit costs of $47.2 million related to our defined benefit pension plans and $16.0 million related to postretirement benefits.  In determining our estimated expenses for 2012, we assumed an 8.25-percent expected return on plan assets and a discount rate of 5.0 percent.  A decrease in our expected return on plan assets to 8.0 percent would increase our 2012 estimated net periodic benefit costs by approximately $2.5 million for our defined benefit pension plans and would not have a significant impact on our postretirement benefit plans.  A decrease in our assumed discount rate to 4.75 percent would increase our 2012 estimated net periodic benefit costs by approximately $3.6 million for our defined benefit pension plans and would not have a significant impact on our postretirement benefit plans.  During 2011, we made contributions of $62.6 million and $11.5 million to our defined benefit pension plans and postretirement benefit plans, respectively.  In 2011, all contributions to our defined benefit pension plans were attributable to the 2012 plan year.  During the first quarter of 2012, we made a contribution of $60.0 million to our defined benefit pension plan attributable to the 2013 plan year; we do not anticipate that we will be required to make additional material defined benefit pension plan contributions in 2012.  We anticipate our 2012 contributions for our postretirement benefit plans will be approximately $10.7 million.

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Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures.  We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered, and an amount can be reasonably estimated.  We base our estimates on currently available facts and our assessments of the ultimate outcome or resolution.  Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study.  Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable.  Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no material effect on earnings or cash flows during 2011, 2010 and 2009.  Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.  See Note Q of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of contingencies.

CONTRACTUAL OBLIGATIONS AND COMMERCIAL COMMITMENTS

The following table sets forth our contractual obligations related to debt, operating leases and other long-term obligations as of December 31, 2011.  For additional discussion of the debt and operating lease agreements, see Notes H and Q, respectively, of the Notes to the Consolidated Financial Statements in this Annual Report:

	Payments Due by Period
Contractual Obligations	Total		2012		2013		2014		2015		2016		Thereafter
ONEOK	(Thousands of dollars)
Commercial paper	$	841,982	$	841,982	$	-	$	-	$	-	$	-	$	-
Long-term debt		989,593		3,329		3,205		3,006		403,006		3,007		574,040
Interest payments on debt		821,000		57,400		57,200		57,000		45,500		35,800		568,100
Operating leases		3,014		1,209		906		638		252		9		-
Firm transportation and storage
contracts		370,586		122,355		87,491		68,209		42,851		26,417		23,263
Financial and physical derivatives		1,031,022		1,017,617		12,565		840		-		-		-
Employee benefit plans		75,385		75,385		-		-		-		-		-
	$	4,132,582	$	2,119,277	$	161,367	$	129,693	$	491,609	$	65,233	$	1,165,403
ONEOK Partners
Long-term debt	$	3,885,919	$	361,062	$	7,650	$	7,650	$	7,650	$	1,107,650	$	2,394,257
Interest payments on debt		3,768,100		224,300		218,400		216,600		215,300		189,000		2,704,500
Operating leases		17,706		3,414		2,840		2,770		1,292		1,009		6,381
Firm transportation and storage
contracts		38,242		8,997		6,521		6,232		6,081		4,725		5,686
Financial and physical derivatives		149,899		149,899		-		-		-		-		-
Purchase commitments,
rights of way and other		406,989		179,850		43,877		25,877		25,602		25,578		106,205
	$	8,266,855	$	927,522	$	279,288	$	259,129	$	255,925	$	1,327,962	$	5,217,029
Total	$	12,399,437	$	3,046,799	$	440,655	$	388,822	$	747,534	$	1,393,195	$	6,382,432

Long-term debt - Long-term debt as reported in our Consolidated Balance Sheets includes unamortized debt discount and the unamortized settlement values of interest-rate swaps.

Interest payments on debt - Interest expense is calculated by multiplying long-term debt by the respective coupon rates, adjusted for active swaps.

Operating leases - Our operating leases include leases for office space, pipeline equipment and vehicles.

Firm transportation and storage contracts - We are party to fixed-price contracts for firm transportation and storage capacity.  However, the costs associated with our Natural Gas Distribution segment’s contracts that are recovered through rates as allowed by the applicable regulatory agency are excluded from the table above.

Financial and physical derivatives - These are obligations arising from our fixed- and variable-price purchase commitments for financial and physical commodity derivatives and interest-rate swaps.  However, the commitments associated with our Distribution segment’s contracts are recovered through rates as allowed by the applicable regulatory agency and are excluded from the table above.  Estimated future variable-price purchase commitments are based on market information at December 31, 2011.  Actual future variable-price purchase commitments may vary depending on market prices at the time of delivery.  Not included in these amounts are offsetting cash inflows from our ONEOK Partners and Energy Services segments’ product sales and net positive settlements.  As market information changes daily and is potentially volatile, these values may change

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significantly.  Additionally, product sales may require additional purchase obligations to fulfill sales obligations that are not reflected in these amounts.

Employee benefit plans - Employee benefit plans include our anticipated contribution to maintain the minimum required funding level to our pension and postretirement benefit plans for 2012.  See Note M of the Notes to Consolidated Financial Statements in this Annual Report for discussion of our employee benefit plans.

Purchase commitments, rights of way and other - Purchase commitments include commitments related to ONEOK Partners’ growth capital expenditures and other rights-of-way and contractual commitments.  Purchase commitments exclude commodity purchase contracts, which are included in the “Financial and physical derivatives” amounts.

FORWARD-LOOKING STATEMENTS

Some of the statements contained and incorporated in this Annual Report are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act.  The forward-looking statements relate to our anticipated financial performance, liquidity, management’s plans and objectives for our future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters.  We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995.  The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained or incorporated in this Annual Report identified by words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled,” and other words and terms of similar meaning.

One should not place undue reliance on forward-looking statements, which are applicable only as of the date of this Annual Report.  Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements.  Those factors may affect our operations, markets, products, services and prices.  In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

·   the effects of weather and other natural phenomena, including climate change, on our operations, including energy sales and demand for our services and energy prices;

·   competition from other United States and foreign energy suppliers and transporters, as well as alternative forms of energy, including, but not limited to, solar power, wind power, geothermal energy and biofuels such as ethanol and biodiesel;

·   the status of deregulation of retail natural gas distribution;

·   the capital intensive nature of our businesses;

·   the profitability of assets or businesses acquired or constructed by us;

·   our ability to make cost-saving changes in operations;

·   risks of marketing, trading and hedging activities, including the risks of changes in energy prices or the financial condition of our counterparties;

·   the uncertainty of estimates, including accruals and costs of environmental remediation;

·   the timing and extent of changes in energy commodity prices;

·   the effects of changes in governmental policies and regulatory actions, including changes with respect to income and other taxes, pipeline safety, environmental compliance, climate change initiatives and authorized rates of recovery of natural gas and natural gas transportation costs;

·   the impact on drilling and production by factors beyond our control, including the demand for natural gas and crude  oil; producers’ desire and ability to obtain necessary permits; reserve performance; and capacity constraints on the pipelines that transport crude oil, natural gas and NGLs from producing areas and our facilities;

·   changes in demand for the use of natural gas because of market conditions caused by concerns about global warming;

·   the impact of unforeseen changes in interest rates, equity markets, inflation rates, economic recession and other external factors over which we have no control, including the effect on pension and postretirement expense and funding resulting from changes in stock and bond market returns;

·   our indebtedness could make us vulnerable to general adverse economic and industry conditions, limit our ability to borrow additional funds and/or place us at competitive disadvantages compared with our competitors that have less debt, or have other adverse consequences;

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·   actions by rating agencies concerning the credit ratings of ONEOK and ONEOK Partners;

·   the results of administrative proceedings and litigation, regulatory actions, rule changes and receipt of expected clearances involving the OCC, KCC, Texas regulatory authorities or any other local, state or federal regulatory body, including the FERC, the National Transportation Safety Board, the Pipeline and Hazardous Materials Safety Administration, the EPA and CFTC;

·   our ability to access capital at competitive rates or on terms acceptable to us;

·   risks associated with adequate supply to our gathering, processing, fractionation and pipeline facilities, including production declines that outpace new drilling;

·   the risk that material weaknesses or significant deficiencies in our internal controls over financial reporting could emerge or that minor problems could become significant;

·   the impact and outcome of pending and future litigation;

·   the ability to market pipeline capacity on favorable terms, including the effects of:

-   future demand for and prices of natural gas and NGLs;

-   competitive conditions in the overall energy market;

-   availability of supplies of Canadian and United States natural gas; and

-   availability of additional storage capacity;

·   performance of contractual obligations by our customers, service providers, contractors and shippers;

·   the timely receipt of approval by applicable governmental entities for construction and operation of our pipeline and other projects and required regulatory clearances;

·   our ability to acquire all necessary permits, consents or other approvals in a timely manner, to promptly obtain all necessary materials and supplies required for construction, and to construct gathering, processing, storage, fractionation and transportation facilities without labor or contractor problems;

·   the mechanical integrity of facilities operated;

·   demand for our services in the proximity of our facilities;

·   our ability to control operating costs;

·   adverse labor relations;

·   acts of nature, sabotage, terrorism or other similar acts that cause damage to our facilities or our suppliers’ or shippers’ facilities;

·   economic climate and growth in the geographic areas in which we do business;

·   the risk of a prolonged slowdown in growth or decline in the United States or international economies, including liquidity risks in United States or foreign credit markets;

·   the impact of recently issued and future accounting updates and other changes in accounting policies;

·   the possibility of future terrorist attacks or the possibility or occurrence of an outbreak of, or changes in, hostilities or changes in the political conditions in the Middle East and elsewhere;

·   the risk of increased costs for insurance premiums, security or other items as a consequence of terrorist attacks;

·   risks associated with pending or possible acquisitions and dispositions, including our ability to finance or integrate any such acquisitions and any regulatory delay or conditions imposed by regulatory bodies in connection with any such acquisitions and dispositions;

·   the possible loss of natural gas distribution franchises or other adverse effects caused by the actions of municipalities;

·   the impact of uncontracted capacity in our assets being greater or less than expected;

·   the ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our state and FERC-regulated rates;

·   the composition and quality of the natural gas and NGLs we gather and process in our plants and transport on our pipelines;

·   the efficiency of our plants in processing natural gas and extracting and fractionating NGLs;

·   the impact of potential impairment charges;

·   the risk inherent in the use of information systems in our respective businesses, implementation of new software and hardware, and the impact on the timeliness of information for financial reporting;

·   our ability to control construction costs and completion schedules of our pipelines and other projects; and

·   the risk factors listed in the reports we have filed and may file with the SEC, which are incorporated by reference.

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements.  Other factors could also have material adverse effects on our future results.  These and other risks are described in greater detail in Item 1A, Risk Factors, in this Annual Report.  All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors.  Other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

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ITEM 7A.                      QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Risk Policy and Oversight - We control the scope of risk management, marketing and trading operations through a comprehensive set of policies and procedures involving senior levels of management.  The Audit Committee of our Board of Directors has oversight responsibilities for our risk-management limits and policies.  Our risk oversight committee, comprised of corporate and business-segment officers, oversees all activities related to commodity price and credit risk management, and marketing and trading activities.  The committee also monitors risk metrics including value-at-risk (VAR) and mark-to-market losses.  We have a risk control group that is assigned responsibility for establishing and enforcing the policies and procedures and monitoring certain risk metrics.  Key risk control activities include risk measurement and monitoring, validation of transactions, portfolio valuation, VAR and other risk metrics.

Our exposure to market risk discussed below includes forward-looking statements and represents an estimate of possible changes in future earnings that would occur assuming hypothetical future movements in interest rates or commodity prices.  Our views on market risk are not necessarily indicative of actual results that may occur and do not represent the maximum possible gains and losses that may occur since actual gains and losses will differ from those estimated based on actual fluctuations in interest rates or commodity prices and the timing of transactions.

COMMODITY PRICE RISK

We are exposed to commodity price risk and the impact of market price fluctuations of natural gas, NGLs and crude oil.  Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in energy prices.  To minimize the risk from market price fluctuations of natural gas, NGLs and crude oil, we use commodity derivative instruments such as futures, physical forward contracts, swaps and options to manage commodity price risk associated with existing or anticipated purchase and sale agreements, existing physical natural gas in storage and basis risk.

ONEOK Partners

ONEOK Partners is exposed to commodity price risk as a result of receiving commodities in exchange for its natural gas gathering and processing services.  To a lesser extent, ONEOK Partners is exposed to the relative price differential between NGLs and natural gas, or the gross processing spread, with respect to its keep-whole contracts.  ONEOK Partners is also exposed to the risk of location price differentials and the cost of third-party transportation to various market locations.  As part of ONEOK Partners’ hedging strategy, ONEOK Partners uses commodity fixed-price physical forwards and derivative contracts, including NYMEX-based futures and over-the-counter swaps, to minimize earnings volatility in its natural gas gathering and processing business related to natural gas, NGL and condensate price fluctuations.

ONEOK Partners reduces its gross processing spread exposure through a combination of physical and financial hedges.  ONEOK Partners utilizes a portion of its percent-of-proceeds equity natural gas as an offset, or natural hedge, to an equivalent portion of its keep-whole shrink requirements.  This has the effect of converting ONEOK Partners’ gross processing spread risk to NGL commodity price risk, and ONEOK Partners then uses financial instruments to hedge the sale of NGLs.

As of December 31, 2011, ONEOK Partners had $33.7 million of commodity-related derivative assets and $3.8 million of commodity-related derivative liabilities, excluding the impact of netting.The following tables set forth ONEOK Partners’ hedging information for the periods indicated, as of February 20, 2012:

	Year Ending December 31, 2012
	Volumes Hedged (a)	Average Price			Percentage Hedged
NGLs (Bbl/d)	8,544	$	1.24	/ gallon	72%
Condensate (Bbl/d)	1,818	$	2.43	/ gallon	73%
Total (Bbl/d)	10,362	$	1.45	/ gallon	72%
Natural gas (MMBtu/d)	44,344	$	4.13	/ MMBtu	73%
(a) - Hedged with fixed-price swaps.

	Year Ending December 31, 2013
	Volumes Hedged (a)		Average Price			Percentage Hedged
NGLs (Bbl/d)		367	$	2.55	/ gallon	2%
Condensate (Bbl/d)		649	$	2.55	/ gallon	23%
Total (Bbl/d)		1,016	$	2.55	/ gallon	4%
Natural gas (MMBtu/d)		50,137	$	3.85	/ MMBtu	75%
(a) - Hedged with fixed-price swaps.

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ONEOK Partners expects its commodity price risk in its gathering and processing business to increase in the future as volumes increase under POP contracts with our customers.  ONEOK Partners’ commodity price risk is estimated as a hypothetical change in the price of NGLs, crude oil and natural gas, excluding the effects of hedging, and assuming normal operating conditions.  ONEOK Partners’ condensate sales are based on the price of crude oil.  ONEOK Partners estimates the following:

·   a $0.01 per gallon change in the composite price of NGLs would change annual net margin by approximately $1.7 million;

·   a $1.00 per barrel change in the price of crude oil would change annual net margin by approximately $1.3 million; and

·   a $0.10 per MMBtu change in the price of natural gas would change annual net margin by approximately $2.2 million.

ONEOK Partners is also exposed to location price differential risk primarily as a result of NGLs in storage, the relative values of the various NGL products to each other, the relative value of NGLs to natural gas and the relative value of NGL purchases at one location and sales at another location.  ONEOK Partners utilizes fixed-price physical forward contracts to reduce earnings volatility related to NGL price fluctuations in the storage and optimization activities of its natural gas liquids business.  ONEOK Partners has not entered into any financial instruments with respect to its natural gas liquids business’s marketing activities.

In addition, ONEOK Partners is exposed to commodity price risk as its natural gas interstate and intrastate pipelines retain natural gas from its customers for operations or as part of its fee for services provided.  When the amount of natural gas consumed in operations by these pipelines differs from the amount provided by its customers, the pipelines must buy or sell natural gas, or store or use natural gas from inventory, which exposes ONEOK Partners to commodity price risk.  At December 31, 2011, there were no hedges in place with respect to natural gas price risk from ONEOK Partners’ natural gas pipeline business.

Natural Gas Distribution

Our Natural Gas Distribution segment uses derivative instruments to hedge the cost of anticipated natural gas purchases during the winter heating months to protect its customers from upward volatility in the market price of natural gas.  Gains or losses associated with these derivative instruments are included in, and recoverable through, the monthly purchased-gas cost-adjustment mechanism.

Energy Services

Our Energy Services segment is exposed to commodity price risk, location risk and price volatility arising from natural gas in storage, peaking natural gas load requirement contracts, asset management contracts and index-based purchases and sales of natural gas at various market locations.  We attempt to mitigate our exposure to commodity price risk through the use of derivative instruments, which, under certain circumstances, are designated as cash flow or fair value hedges.  We are also exposed to commodity price risk from fixed-price purchases and sales of natural gas, which we hedge with derivative instruments.  Both the fixed-price purchases and sales and related derivatives are recorded at fair value.

Fair Value Component of the Energy Marketing and Risk Management Assets and Liabilities - The following table sets forth the fair value component of the energy marketing and risk management assets and liabilities, excluding $80.7 million and $101.1 million of net assets at December 31, 2011 and 2010, respectively, from derivative instruments declared as either fair value or cash flow hedges for the periods indicated:

Fair Value Component of Energy Marketing and Risk Management Assets and Liabilities
	(Thousands of dollars)
Net fair value of derivatives outstanding at January 1, 2010	$	2,725
Derivatives reclassified or otherwise settled during the period		(7,494	)
Fair value of new derivatives entered into during the period		31,817
Other changes in fair value		(18,607	)
Net fair value of derivatives outstanding at December 31, 2010		8,441
Derivatives reclassified or otherwise settled during the period		(11,378	)
Fair value of new derivatives entered into during the period		70,141
Other changes in fair value		(54,595	)
Net fair value of derivatives outstanding at December 31, 2011 (a)	$	12,609
(a) - The maturities of derivatives are based on injection and withdrawal periods from April through March, which is consistent with our business strategy. The maturities are as follows: $0.8 million matures through March 2012 and $11.8 million matures through March 2015.

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The change in the net fair value of derivatives outstanding includes the effect of settled energy contracts and current period changes resulting primarily from newly originated transactions and the impact of market movements on the fair value of energy marketing and risk management assets and liabilities.

For further discussion of fair value measurements and trading activities and assumptions used in our trading activities, see the “Estimates and Critical Accounting Policies” section of Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation.  Also, see Notes C and D of the Notes to Consolidated Financial Statements in this Annual Report.

VAR Disclosure of Commodity Price Risk - We measure commodity price risk in our Energy Services segment using a VAR methodology, which estimates the expected maximum loss of our portfolio over a specified time horizon within a given confidence interval.  Our VAR calculations are based on the Monte Carlo approach.  The quantification of commodity price risk using VAR provides a consistent measure of risk across diverse energy markets and products with different risk factors in order to set overall risk tolerance and to determine risk thresholds.  The use of this methodology requires a number of key assumptions, including the selection of a confidence level and the holding period to liquidation.  Historical data is used to estimate our VAR with more weight given to recent data, which is considered a more relevant predictor of immediate future commodity market movements.  Other assumptions include a distribution of prices and historical data to calculate volatility and price correlations.  We rely on VAR to determine the potential reduction in the portfolio values arising from changes in market conditions over a defined period.  While management believes that the referenced assumptions and approximations are reasonable, no uniform industry methodology exists for estimating VAR.  Different assumptions and approximations could produce materially different VAR estimates.

Our VAR exposure represents an estimate of potential losses that would be recognized due to adverse commodity price movements in our Energy Services segment’s portfolio of derivative financial instruments, physical commodity contracts, leased transport, storage capacity contracts and natural gas in storage.  A one-day time horizon and a 95-percent confidence level are used in our VAR data.  Actual future gains and losses will differ from those estimated by the VAR calculation based on actual fluctuations in commodity prices, operating exposures and timing thereof, and the changes in our derivative financial instruments, physical contracts and natural gas in storage.  VAR information should be evaluated in light of these assumptions and the methodology’s other limitations.

The potential impact on our future earnings, as measured by VAR, was $2.7 million and $2.9 million at December 31, 2011 and 2010, respectively.  The following table sets forth the average, high and low VAR calculations for the periods indicated:

	Years Ended December 31,
Value-at-Risk	2011		2010
	(Millions of dollars)
Average	$	3.0	$	5.5
High	$	6.6	$	9.6
Low	$	1.2	$	2.3

Our VAR calculation includes derivatives, executory storage and transportation agreements and their related hedges.  The variations in the VAR data are reflective of market volatility and changes in our portfolio during the year.  The decrease in average VAR for 2011, compared with 2010, was due primarily to lower average commodity prices and decreased price volatility in 2011.

To the extent open commodity positions exist, fluctuating commodity prices can impact our financial results and financial position either favorably or unfavorably.  As a result, we cannot predict with precision the impact risk-management decisions may have on our business, operating results or financial position.

INTEREST-RATE RISK

General - We are subject to the risk of interest-rate fluctuation in the normal course of business.  We manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and, at times, interest-rate swaps.  Fixed-rate swaps may be used to reduce our risk of increased interest costs during periods of rising interest rates.  Floating-rate swaps may be used to convert the fixed rates of long-term borrowings into short-term variable rates.  At December 31, 2011, the interest rate on all of ONEOK’s and ONEOK Partners’ long-term debt was fixed, and ONEOK and ONEOK Partners had forward-starting interest-rate swaps that have been designated as cash flow hedges of the variability of interest payments on a portion of a forecasted debt issuance that may result from changes in the benchmark interest rate before the debt is issued.

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COUNTERPARTY CREDIT RISK

ONEOK and ONEOK Partners assess the creditworthiness of their counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate.

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ITEM 8.                      FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders

ONEOK, Inc.:

In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of income, shareholders' equity, comprehensive income and cash flows present fairly, in all material respects, the financial position of ONEOK, Inc. and its subsidiaries (the Company) at December 31, 2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011, in conformity with accounting principles generally accepted in the United States of America.  Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  The Company's management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Report on Internal Control over Financial Reporting appearing under Item 9A in the Company's Form 10-K for the year ended December 31, 2011.  Our responsibility is to express opinions on these financial statements and on the Company's internal control over financial reporting based on our integrated audits.  We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects.  Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation.  Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk.  Our audits also included performing such other procedures as we considered necessary in the circumstances.  We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.  A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements.  Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/  PricewaterhouseCoopers LLP

Tulsa, Oklahoma

February 21, 2012

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED  STATEMENTS OF INCOME
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars, except per share amounts)
Revenues	$	14,805,794		$	12,678,791		$	10,805,753
Cost of sales and fuel		12,425,435			10,616,621			8,807,802
Net margin		2,380,359			2,062,170			1,997,951
Operating expenses
Operations and maintenance		813,666			740,881			729,986
Depreciation and amortization		312,160			307,224			288,923
General taxes		94,657			90,032			100,974
Total operating expenses		1,220,483			1,138,137			1,119,883
Gain (loss) on sale of assets		(963	)		18,619			4,806
Operating income		1,158,913			942,652			882,874
Equity earnings from investments (Note O)		127,246			101,880			72,722
Allowance for equity funds used during construction		2,335			1,018			26,868
Other income		1,410			11,527			19,730
Other expense		(9,336	)		(11,067	)		(14,709	)
Interest expense		(297,006	)		(292,232	)		(300,820	)
Income before income taxes		983,562			753,778			686,665
Income taxes (Note N)		(226,048	)		(213,720	)		(203,008	)
Income from continuing operations		757,514			540,058			483,657
Income from discontinued operations, net of tax (Note B)		2,230			1,272			7,547
Net income		759,744			541,330			491,204
Less: Net income attributable to noncontrolling interests		399,150			206,698			185,753
Net income attributable to ONEOK	$	360,594		$	334,632		$	305,451
Amounts attributable to ONEOK:
Income from continuing operations	$	358,364		$	333,360		$	297,904
Income from discontinued operations		2,230			1,272			7,547
Net Income	$	360,594		$	334,632		$	305,451
Basic earnings per share (Note K):
Income from continuing operations	$	3.42		$	3.14		$	2.83
Income from discontinued operations		0.02			0.01			0.07
Net Income	$	3.44		$	3.15		$	2.90
Diluted earnings per share (Note K):
Income from continuing operations	$	3.34		$	3.09		$	2.80
Income from discontinued operations		0.02			0.01			0.07
Net Income	$	3.36		$	3.10		$	2.87
Average shares (thousands)
Basic		104,672			106,368			105,362
Diluted		107,249			107,785			106,320
Dividends declared per share of common stock	$	2.16		$	1.82		$	1.64
See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Net income	$	759,744		$	541,330		$	491,204
Other comprehensive income (loss), net of tax
Unrealized gain (losses) on energy marketing and risk management
assets/liabilities, net of tax of $(8,670), $(43,039) and $(26,488),
respectively		(19,828	)		85,623			24,455
Realized gains in net income, net of tax of $53,714,
$29,278 and $48,059, respectively		(84,025	)		(48,117	)		(104,549	)
Unrealized holding gains (losses) on available-for-sale securities,
net of tax of $242, $44 and $(396), respectively		(384	)		(70	)		627
Change in pension and postretirement benefit plan liability, net of tax
of $16,298, $7,570 and $9,186, respectively		(25,837	)		(12,001	)		(14,560	)
Other, net of tax of $50, $(45) and $(84), respectively		(79	)		71			244
Total other comprehensive income (loss), net of tax		(130,153	)		25,506			(93,783	)
Comprehensive income		629,591			566,836			397,421
Less: Comprehensive income attributable to noncontrolling interests		366,316			222,393			139,967
Comprehensive income attributable to ONEOK	$	263,275		$	344,443		$	257,454
See accompanying Notes to Consolidated Financial Statements.

75

ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
	December 31,		December 31,
	2011		2010
Assets	(Thousands of dollars)
Current assets
Cash and cash equivalents	$	65,953	$	30,341
Accounts receivable, net		1,339,933		1,283,891
Gas and natural gas liquids in storage		549,915		706,912
Commodity imbalances		63,452		94,854
Energy marketing and risk management assets (Notes C and D)		40,280		54,691
Other current assets		185,143		149,521
Assets of discontinued operations (Note B)		74,136		59,525
Total current assets		2,318,812		2,379,735
Property, plant and equipment
Property, plant and equipment		11,177,934		9,853,821
Accumulated depreciation and amortization		2,733,601		2,540,873
Net property, plant and equipment (Note E)		8,444,333		7,312,948
Investments and other assets
Goodwill and intangible assets (Note F)		1,014,127		1,022,894
Investments in unconsolidated affiliates (Note O)		1,223,398		1,188,124
Other assets		695,965		595,474
Total investments and other assets		2,933,490		2,806,492
Total assets	$	13,696,635	$	12,499,175
See accompanying Notes to Consolidated Financial Statements.

76

ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
	December 31,			December 31,
	2011			2010
Liabilities and equity	(Thousands of dollars)
Current liabilities
Current maturities of long-term debt (Note H)	$	364,391		$	643,236
Notes payable (Note G)		841,982			556,855
Accounts payable		1,341,718			1,212,323
Commodity imbalances		202,206			288,494
Energy marketing and risk management liabilities (Notes C and D)		137,680			22,066
Other current liabilities		345,383			416,248
Liabilities of discontinued operations (Note B)		12,815			12,209
Total current liabilities		3,246,175			3,151,431
Long-term debt, excluding current maturities (Note H)		4,529,551			3,686,542
Deferred credits and other liabilities
Deferred income taxes		1,446,591			1,171,997
Other deferred credits		674,586			568,364
Total deferred credits and other liabilities		2,121,177			1,740,361
Commitments and contingencies (Note Q)
Equity (Note I)
ONEOK shareholders' equity:
Common stock, $0.01 par value:
authorized 300,000,000 shares; issued 122,904,924 shares and outstanding
103,254,980 shares at December 31, 2011; issued 122,815,636 shares and
outstanding 106,815,582 shares at December 31, 2010		1,229			1,228
Paid-in capital		1,418,414			1,392,671
Accumulated other comprehensive loss (Note J)		(206,121	)		(108,802	)
Retained earnings		1,960,374			1,826,800
Treasury stock, at cost: 19,649,944 shares at December 31, 2011 and
16,000,054 shares at December 31, 2010		(935,323	)		(663,274	)
Total ONEOK shareholders' equity		2,238,573			2,448,623
Noncontrolling interests in consolidated subsidiaries		1,561,159			1,472,218
Total equity		3,799,732			3,920,841
Total liabilities and equity	$	13,696,635		$	12,499,175
See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CASH FLOWS	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Operating Activities
Net income	$	759,744		$	541,330		$	491,204
Depreciation and amortization		312,288			307,317			288,991
Allowance for equity funds used during construction		(2,335	)		(1,018	)		(26,868	)
Loss (gain) on sale of assets		963			(18,619	)		(4,806	)
Equity earnings from investments		(127,246	)		(101,880	)		(72,722	)
Distributions received from unconsolidated affiliates		132,741			96,958			75,377
Deferred income taxes		256,688			142,303			198,713
Share-based compensation expense		66,371			24,372			23,148
Other		(1,471	)		4,153			1,216
Changes in assets and liabilities:
Accounts receivable		(55,861	)		92,469			(181,426	)
Gas and natural gas liquids in storage		65,845			(164,722	)		266,674
Accounts payable		102,621			(43,883	)		154,039
Commodity imbalances, net		(54,886	)		(15,316	)		77,174
Energy marketing and risk management assets and liabilities		(31,999	)		112,827			113,540
Fair value of firm commitments		(22,252	)		(105,084	)		176,799
Pension and postretirement benefits		(29,863	)		(68,719	)		(42,040	)
Other assets and liabilities		(11,376	)		31,554			(86,319	)
Cash provided by operating activities		1,359,972			834,042			1,452,694
Investing Activities
Capital expenditures (less allowance for equity funds used during construction)		(1,336,067	)		(582,748	)		(791,245	)
Contributions to unconsolidated affiliates		(64,491	)		(1,331	)		(46,461	)
Distributions received from unconsolidated affiliates		23,644			17,847			34,430
Proceeds from sale of assets		1,288			428,908			10,982
Other		4,000			2,968			4,500
Cash used in investing activities		(1,371,626	)		(134,356	)		(787,794	)
Financing Activities
Borrowing (repayment) of notes payable, net		285,127			(325,015	)		(518,130	)
Repayment of notes payable with maturities over 90 days		-			-			(870,000	)
Issuance of debt, net of discounts		1,295,450			-			498,325
Long-term debt financing costs		(10,986	)		-			(4,000	)
Payment of debt		(727,562	)		(262,715	)		(114,975	)
Repurchase of common stock		(300,108	)		(7	)		(254	)
Issuance of common stock		17,906			20,912			17,317
Issuance of common units, net of discounts		-			322,701			241,642
Dividends paid		(227,020	)		(193,542	)		(172,774	)
Distributions to noncontrolling interests		(277,375	)		(260,385	)		(222,710	)
Cash provided by (used in) financing activities		55,432			(698,051	)		(1,145,559	)
Change in cash and cash equivalents		43,778			1,635			(480,659	)
Change in cash and cash equivalents included in discontinued operations		(8,166	)		(2,211	)		15,558
Change in cash and cash equivalents from continuing operations		35,612			(576	)		(465,101	)
Cash and cash equivalents at beginning of period		30,341			30,917			496,018
Cash and cash equivalents at end of period	$	65,953		$	30,341		$	30,917
Supplemental cash flow information:
Cash paid for interest, net of amounts capitalized	$	278,162		$	298,354		$	314,509
Cash paid (refunds received) for income taxes	$	(68,696	)	$	16,841		$	30,560
See accompanying Notes to Consolidated Financial Statements.

79

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
	ONEOK Shareholders' Equity
							Accumulated
	Common						Other
	Stock		Common		Paid-in		Comprehensive
	Issued		Stock		Capital		Income (Loss)
	(Shares)		(Thousands of dollars)
January 1, 2009		121,647,007	$	1,216	$	1,301,153	$	(70,616	)
Net income		-		-		-		-
Other comprehensive loss		-		-		-		(47,997	)
Repurchase of common stock		-		-		-		-
Common stock issued		747,008		8		21,187		-
Common stock dividends -
$1.64 per share		-		-		-		-
Issuance of common units of ONEOK Partners		-		-		-		-
Distributions to noncontrolling interests		-		-		-		-
December 31, 2009		122,394,015		1,224		1,322,340		(118,613	)
Net income		-		-		-		-
Other comprehensive income		-		-		-		9,811
Repurchase of common stock		-		-		-		-
Common stock issued		421,621		4		19,600		-
Common stock dividends -
$1.82 per share		-		-		-		-
Issuance of common units of ONEOK Partners		-		-		50,731		-
Distributions to noncontrolling interests		-		-		-		-
Other		-		-		-		-
December 31, 2010		122,815,636		1,228		1,392,671		(108,802	)
Net income		-		-		-		-
Other comprehensive income		-		-		-		(97,319	)
Repurchase of common stock		-		-		-		-
Common stock issued		89,288		1		25,743		-
Common stock dividends -
$2.16 per share		-		-		-		-
Distributions to noncontrolling interests		-		-		-		-
December 31, 2011		122,904,924	$	1,229	$	1,418,414	$	(206,121	)
See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
(Continued)
	ONEOK Shareholders' Equity
							Noncontrolling
							Interests in
	Retained			Treasury			Consolidated			Total
	Earnings			Stock			Subsidiaries			Equity
	(Thousands of dollars)
January 1, 2009	$	1,553,033		$	(696,616	)	$	1,079,369		$	3,167,539
Net income		305,451			-			185,753			491,204
Other comprehensive income		-			-			(45,786	)		(93,783	)
Repurchase of common stock		-			(254	)		-			(254	)
Common stock issued		-			13,403			-			34,598
Common stock dividends -
$1.64 per share		(172,774	)		-			-			(172,774	)
Issuance of common units of ONEOK Partners		-			-			241,642			241,642
Distributions to noncontrolling interests		-			-			(222,710	)		(222,710	)
December 31, 2009		1,685,710			(683,467	)		1,238,268			3,445,462
Net income		334,632			-			206,698			541,330
Other comprehensive income		-			-			15,695			25,506
Repurchase of common stock		-			(7	)		-			(7	)
Common stock issued		-			20,200			-			39,804
Common stock dividends -
$1.82 per share		(193,542	)		-			-			(193,542	)
Issuance of common units of ONEOK Partners		-			-			271,970			322,701
Distributions to noncontrolling interests		-			-			(260,385	)		(260,385	)
Other		-			-			(28	)		(28	)
December 31, 2010		1,826,800			(663,274	)		1,472,218			3,920,841
Net income		360,594			-			399,150			759,744
Other comprehensive income		-			-			(32,834	)		(130,153	)
Repurchase of common stock		-			(300,108	)		-			(300,108	)
Common stock issued		-			28,059			-			53,803
Common stock dividends -
$2.16 per share		(227,020	)		-			-			(227,020	)
Distributions to noncontrolling interests		-			-			(277,375	)		(277,375	)
December 31, 2011	$	1,960,374		$	(935,323	)	$	1,561,159		$	3,799,732

81

ONEOK, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

A.           SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Operations- We are a diversified energy company and successor to the company founded in 1906 known as Oklahoma Natural Gas Company.  We are a corporation incorporated under the laws of the state of Oklahoma, and our common stock is listed on the NYSE under the trading symbol “OKE.”  We are the sole general partner and own 42.8 percent of ONEOK Partners, L.P. (NYSE: OKS), one of the largest publicly traded master limited partnerships.

We have divided our operations into three reportable business segments as follows:

·   ONEOK Partners;

·   Natural Gas Distribution; and

·   Energy Services.

ONEOK Partners is a diversified master limited partnership involved in the gathering, processing, storage and transportation of natural gas in the United States.  In addition, ONEOK Partners owns one of the nation’s premier natural gas liquids systems, connecting NGL supply in the Mid-Continent and Rocky Mountain regions with key market centers.  To aid in understanding the important business and financial characteristics of our ONEOK Partners segment, the following describes its business with reference to its underlying activities.

ONEOK Partners’ natural gas gathering and processing business is engaged in the gathering and processing of natural gas produced from crude oil and natural gas wells, primarily in the Mid-Continent and Rocky Mountain regions.  These regions include the NGL-rich Cana-Woodford Shale and Granite Wash formations; the Mississippian Lime formation of Oklahoma and Kansas; Hugoton and Central Kansas Uplift Basins of Kansas; the Williston Basin of Montana and North Dakota that includes the oil-producing, NGL-rich Bakken Shale and Three Forks formations; and the Powder River Basin of Wyoming.  In the Powder River Basin, the natural gas that ONEOK Partners gathers is coal-bed methane, or dry, natural gas that does not require processing or NGL extraction in order to be marketable.  Dry natural gas is gathered, compressed and delivered into a downstream pipeline or marketed for a fee.

ONEOK Partners’ natural gas pipeline business operates interstate and intrastate natural gas transmission pipelines, natural gas storage facilities and nonprocessable natural gas gathering facilities.  ONEOK Partners’ FERC-regulated interstate assets transport natural gas through pipelines that access supply from Canada and from the Mid-Continent, Rocky Mountain and Gulf Coast regions.  ONEOK Partners’ intrastate natural gas pipeline assets are located in Oklahoma, Texas and Kansas, and have access to major natural gas producing areas in those states, including the Cana-Woodford, Granite Wash and Mississippian Lime formations.  ONEOK Partners owns underground natural gas storage facilities in Oklahoma, Kansas and Texas, which are connected to its intrastate natural gas pipeline assets.

ONEOK Partners’ natural gas liquids business consists of facilities that gather, fractionate and treat NGLs and store NGL products primarily in Oklahoma, Kansas and Texas.  Its natural gas liquids business owns or has an ownership interest in FERC-regulated natural gas liquids gathering and distribution pipelines in Oklahoma, Kansas, Texas, Wyoming and Colorado and terminal and storage facilities in Missouri, Nebraska, Iowa and Illinois.  It also owns FERC-regulated natural gas liquids distribution and refined petroleum products pipelines in Kansas, Missouri, Nebraska, Iowa and Illinois that connect its Mid-Continent assets with Midwest markets, including Chicago, Illinois.  ONEOK Partners’ natural gas liquids business also owns and operates truck and rail-loading and unloading facilities that interconnect with its fractionation and pipeline assets.

Our Natural Gas Distribution segment provides natural gas distribution services to more than 2 million customers in Oklahoma, Kansas and Texas through Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service.  We serve residential, commercial, industrial and transportation customers in all three states.  In addition, our natural gas distribution companies serve wholesale and public authority customers.

Our Energy Services segment is a provider of nonuniform natural gas supply and risk-management services for natural gas and electric utilities and commercial and industrial customers with natural gas needs.  We use a network of leased storage and transportation capacity to supply natural gas to our customers.  This network connects the major supply and demand centers throughout the United States and into Canada and, coupled with our industry knowledge and market intelligence, allows us to provide our customers with customized services in a more efficient and reliable manner than they can achieve independently.  Our customers are primarily LDCs, electric utilities and commercial and industrial end-users.  Our customers’ natural gas needs vary with seasonal changes in weather and are therefore somewhat unpredictable.

82  

Consolidation - Our consolidated financial statements include the accounts of ONEOK and our subsidiaries over which we have control.  We have recorded noncontrolling interests in consolidated subsidiaries on our Consolidated Balance Sheets to recognize the percent of ONEOK Partners that we do not own.  We reflected our ownership interest in ONEOK Partners’ accumulated other comprehensive income (loss) in our consolidated accumulated other comprehensive income (loss).  The remaining portion is reflected as an adjustment to noncontrolling interests in consolidated subsidiaries.  All significant intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee; conversely, if we do not have the ability to exercise significant influence, then we use the cost method.  Impairment of equity and cost method investments is recorded when the impairments are other than temporary.  Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment.  The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates - The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements.  These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period.  Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets and liabilities, obligations under employee benefit plans, provisions for uncollectible accounts receivable, unbilled revenues for natural gas delivered but for which meters have not been read, gas purchased expense for natural gas purchased but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other recorded or disclosed amounts.

We evaluate these estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances.  Nevertheless, actual results may differ significantly from the estimates.  Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements -We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  Inputs into our fair value estimates include commodity exchange prices, over-the-counter quotes, volatility, historical correlations of pricing data and LIBOR and other liquid money market instrument rates.  We also utilize internally developed basis curves that incorporate observable and unobservable market data.  We validate our valuation inputs with third-party information and settlement prices from other sources, where available.  In addition, as prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  We also take into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions.  We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using specific and sector bond yields and also monitor the credit default swap markets.  Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be material.

The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value.  The levels of the hierarchy are described below:

·   Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;

·   Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date.  Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and

83

·   Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate.  These unobservable inputs are developed based on the best information available and may include our own internal data.

We recognize transfers into and out of Level 3 as of the end of each reporting period.  Transfers into Level 3 represent existing assets or liabilities that were categorized previously at a higher level for which the unobservable inputs became a more significant portion of the fair value estimates.  Transfers out of Level 3 represent existing assets and liabilities that were classified previously as Level 3 for which the observable inputs became a more significant portion of the fair value estimates.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data.  We categorize derivatives for which fair value is determined using multiple inputs within a single level, based on the lowest level input that is significant to the fair value measurement in its entirety.  See Note C for additional disclosures of our fair value measurements.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition- Our operating segments recognize revenue when services are rendered or product is delivered.  ONEOK Partners’ natural gas gathering and processing operations record revenue when gas is processed in or transported through its facilities.  ONEOK Partners’ natural gas liquids operations record revenues based upon contracted services and actual volumes exchanged or stored under service agreements in the period services are provided.  Revenue for ONEOK Partners’ natural gas pipelines and a portion of its natural gas liquids operations is recognized based upon contracted capacity and contracted volumes transported and stored under service agreements in the period services are provided.

Our Natural Gas Distribution segment’s major industrial and commercial natural gas distribution customers are invoiced at the end of each month.  All natural gas distribution residential customers, all retail customers and some distribution commercial customers are invoiced on a cyclical basis throughout the month, and we accrue unbilled revenues at the end of each month.

Our Energy Services segment’s wholesale customers are invoiced at the end of each month based on physical sales.  Demand payments received for requirements contracts are recognized in the period in which the service is provided.  Our fixed-price physical sales are accounted for as derivatives and are recorded at fair value.  See discussion below in “Derivative and Risk Management Activities” for additional information.

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered, net of allowances for doubtful accounts.  We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate.  Outstanding customer receivables are reviewed regularly for possible nonpayment indicators and allowances for doubtful accounts are recorded based upon management’s estimate of collectability at each balance sheet date.  At December 31, 2011 and 2010, our allowance for doubtful accounts was not material.

Inventories - The values of current natural gas and NGLs in storage are determined using the lower of weighted-average cost or market method.  Noncurrent natural gas and NGLs are classified as property and valued at cost.  Materials and supplies are valued at average cost.

Commodity Imbalances -Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at fair value.  Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty.  In turn, we deliver NGL products back to the customer and charge them gathering and fractionation fees.  To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties.  These net exchange receivables and payables are settled with movements of NGL products rather than with cash.  Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines’ tariffs or by agreement.

Derivatives and Risk Management Activities - We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.

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If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values, cash flows or foreign currency.  Certain nontrading derivative transactions, which are economic hedges of our accrual transactions such as our storage and transportation contracts, do not qualify for hedge accounting treatment.

The table below summarizes the various ways in which we account for our derivative instruments and the impact on our consolidated financial statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the derivative instrument is recognized in earnings
	-	Effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	Effective portion of the gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

Gains or losses associated with the fair value of derivative instruments entered into by our Natural Gas Distribution segment are included in, and recoverable through, the monthly purchased-gas cost mechanism.

We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness.  We specifically identify the asset, liability, firm commitment or forecasted transaction that has been designated as the hedged item.  We assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on our cash flow and fair value hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis.  We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The presentation of settled derivative instruments on either a gross or net basis in our Consolidated Statements of Income is dependent on the relevant facts and circumstances of our different types of activities rather than based solely on the terms of the individual contracts.  All financially settled derivative instruments, as well as derivative instruments considered held for trading purposes that result in physical delivery, are reported on a net basis in revenues in our Consolidated Statements of Income.  The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and nonderivative contracts are reported on a gross basis.  Derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are also reported on a gross basis.

Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties.  Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes C and D for more discussion of our fair value measurements and risk management and hedging activities using derivatives.

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC.  Generally, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation.  Gains and losses from sales or retirement of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income.  Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC represents the cost of borrowed funds used to finance construction activities.  We capitalize interest costs during the construction or upgrade of qualifying assets.  Interest costs capitalized in 2011, 2010 and 2009 were $24.0 million, $4.9 million and $17.0 million, respectively.  Capitalized interest is recorded as a reduction to interest expense.  

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The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives.  Generally, we apply composite depreciation rates to functional groups of property having similar economic circumstances.  We periodically conduct depreciation studies to assess the economic lives of our assets.  For our regulated assets, these depreciation studies are completed as a part of our rate proceedings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are billed.  For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively.  Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

Property, plant and equipment on our Consolidated Balance Sheets includes construction work in progress for capital projects that have not yet been placed in service and therefore are not being depreciated.  Assets are transferred out of construction work in progress when they are substantially complete and ready for their intended use.

See Note E for disclosures of our property, plant and equipment.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill and indefinite-lived intangible assets for impairment at least annually as of July 1.  As part of our impairment test, an initial assessment is made by comparing the fair value of a reporting unit with its book value, including goodwill.  If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the impairment.  In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets of the reporting unit from the fair value determined in step one of the assessment.  If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.  There were no impairment charges resulting from our 2011, 2010 or 2009 impairment tests.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective.  Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates.  Under the market approach, we apply multiples to forecasted cash flows.  The multiples used are consistent with historical asset transactions.  The forecasted cash flows are based on average forecasted cash flows over a period of years.

As part of our indefinite-lived intangible asset impairment test, we compare the estimated fair value of our indefinite-lived intangible assets with their book values.  The fair value of our indefinite-lived intangible assets is estimated using the market approach.  Under the market approach, we apply multiples to forecasted cash flows of the assets associated with our indefinite-lived intangible assets.  The multiples used are consistent with historical asset transactions.  We determined that there were no impairments to our indefinite-lived intangible asset in 2011, 2010 or 2009.

We assess our long-lived assets, including intangible assets with finite useful lives, for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable.  An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset.  If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.  We determined that there were no asset impairments in 2011, 2010 or 2009.

For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary.  Therefore, we periodically reevaluate the amount at which we carry our equity method investments to determine whether current events or circumstances warrant adjustments to our carrying value.  We determined that there were no impairments to our investments in unconsolidated affiliates in 2011, 2010 or 2009.

Our impairment tests require the use of assumptions and estimates such as industry economic factors and the profitability of future business strategies.  If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Notes E and F for our goodwill and long-lived assets disclosures.

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Regulation - Our natural gas distribution operations and ONEOK Partners’ intrastate natural gas transmission pipelines are subject to the rate regulation and accounting requirements of the OCC, KCC, RRC and various municipalities in Texas.  ONEOK Partners’ interstate natural gas and natural gas liquids pipelines are subject to regulation by the FERC.  In Kansas and Texas, natural gas storage may be regulated by the state and the FERC for certain types of services.  Oklahoma Natural Gas, Kansas Gas Service, Texas Gas Service and portions of our ONEOK Partners segment follow the accounting and reporting guidance for regulated operations.  During the rate-making process, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time, as opposed to expensing such costs as incurred.  Examples include costs for fuel and fuel losses, acquisition costs and contributions in aid of construction.  This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery.  Actions by regulatory authorities could have an effect on the amount recovered from rate payers.  Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action.  A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer:

·   established by independent, third-party regulators;

·   designed to recover the specific entity’s costs of providing regulated services; and

·   set at levels that will recover our costs when considering the demand and competition for our services.

At December 31, 2011 and 2010, we recorded regulatory assets of approximately $539.7 million and $463.9 million, respectively, which are being recovered as a result of various approved rate proceedings or are expected to be recovered.  Of these amounts, approximately $466.6 million and $375.1 million relate to our pension and postretirement benefit plans at December 31, 2011 and 2010, respectively, which are discussed on page 107.  Regulatory assets are being recovered as a result of approved rate proceedings over varying time periods up to 40 years.  These assets are reflected in other assets on our Consolidated Balance Sheets.

Pension and Postretirement Employee Benefits - We have defined benefit retirement plans covering certain full-time employees.  We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  Our actuarial consultant calculates the expense and liability related to these plans and uses statistical and other factors that attempt to anticipate future events.  These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and employment periods.  In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the costs and liabilities we recognize.  See Note M for more discussion of pension and postretirement employee benefits.

Income Taxes - Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carry-forward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse.  The effect on deferred taxes of a change in tax rates is deferred and amortized for operations regulated by the OCC, KCC, RRC and various municipalities in Texas if, as a result of an action by a regulator, it is probable that the effect of the change in tax rates will be recovered from or returned to customers through future rates.  For all other operations, the effect is recognized in income in the period that includes the enactment date.  We continue to amortize previously deferred investment tax credits for ratemaking purposes over the period prescribed by the OCC, KCC, RRC and various municipalities in Texas.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return.  We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute.  During 2011, 2010 and 2009, our tax positions did not require an establishment of a material reserve.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States and Canada, along with the tax authorities of several states.  There are no United States federal audits or statute waivers at this time.  We have been notified by the state of Texas of its intent to audit tax years 2008-2011.  See Note N for additional discussion of income taxes.

Asset Retirement Obligations - Asset retirement obligationsrepresent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset.  We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made.  We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of

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our assets because the settlement dates are indeterminable.  For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset.  The liability is accreted at the end of each period through charges to operating expense.  If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement.  The depreciation and amortization expense are immaterial to our consolidated financial statements.

In accordance with long-standing regulatory treatment, we collect through rates the estimated costs of removal on certain regulated properties through depreciation expense, with a corresponding credit to accumulated depreciation and amortization.  These removal costs are nonlegal obligations; however, the amounts collected that are in excess of these nonlegal asset-removal costs incurred are accounted for as a regulatory liability.  Historically, the regulatory authorities that have jurisdiction over our regulated operations have not required us to quantify this amount; rather, these costs are addressed prospectively in depreciation rates and are set in each general rate order.  We have made an estimate of our regulatory liability using current rates since the last general rate order in each of our jurisdictions; however, significant uncertainty exists regarding the ultimate determination of this liability, pending, among other issues, clarification of regulatory intent.  We continue to monitor the regulatory authorities, and the liability may be adjusted as more information is obtained.  We record the estimated nonlegal asset removal obligation in noncurrent liabilities in other deferred credits on our Consolidated Balance Sheets.  To the extent this estimated liability is adjusted, such amounts will be reclassified between accumulated depreciation and amortization and other deferred credits and therefore will not have an impact on earnings.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures.  We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably.  We base our estimates on currently available facts and our estimates of the ultimate outcome or resolution.  Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study.  Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable.  Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.  See Note Q for additional discussion of contingencies.

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures.  We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

Earnings per Common Share - Basic EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period.  Diluted EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components.  The dilutive components are calculated based on the dilutive effect for each quarter.  For fiscal year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

Recently Issued Accounting Standards Update -In January 2010, the FASB issued ASU 2010-06, “Improving Disclosures about Fair Value Measurements,” which requires separate disclosures of purchases, sales, issuances and settlements in the reconciliation of our Level 3 fair value measurements.  We adopted this guidance with our March 31, 2011, Quarterly Report, and the impact was not material.  Other provisions of ASU 2010-06 were adopted in 2010.

In May 2011, the FASB issued ASU 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (IFRS),” which provides a consistent definition of fair value and common requirements for measurement of and disclosure about fair value between GAAP and IFRS.  This new guidance changes some fair value measurement principles and disclosure requirements.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In June 2011, the FASB issued ASU 2011-05, “Presentation of Comprehensive Income,” which provides two options for presenting items of net income, comprehensive income and total comprehensive income by creating either one continuous statement of comprehensive income or two separate consecutive statements, and requires certain other disclosures.  In December 2011, the FASB issued ASU 2011-12, “Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05,” which deferred certain presentation requirements in ASU 2011-05 for items reclassified out of accumulated other comprehensive income.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In September 2011, the FASB issued ASU 2011-08, “Testing Goodwill for Impairment,” which permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its

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carrying amount.  Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount.  An entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.  An entity may also resume performing the qualitative assessment in any subsequent period.  We will adopt this guidance beginning with our July 1, 2012, goodwill impairment test.

B.           DISCONTINUED OPERATIONS

In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

The amounts of revenue, costs and income taxes reported in discontinued operations are set forth in the table below for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Operating revenues	$	313,371		$	351,260		$	305,897
Cost of sales and fuel		302,561			340,888			287,902
Net margin		10,810			10,372			17,995
Operating costs		7,147			8,914			6,162
Depreciation, depletion and amortization		128			93			68
Operating income		3,535			1,365			11,765
Other income (expense), net		(50	)		21			95
Income taxes		(1,255	)		(114	)		(4,313	)
Income from discontinued operations, net	$	2,230		$	1,272		$	7,547

The following table discloses the major classes of discontinued assets and liabilities included on our Consolidated Balance Sheets for the periods indicated:

	December 31,
	2011		2010
Assets	(Thousands of dollars)
Cash and cash equivalents	$	8,859	$	693
Accounts receivable, net		47,967		48,834
Gas in storage		2,101		2,020
Energy marketing and risk management assets		15,016		7,703
Property, plant and equipment, net		145		235
Other assets		48		40
Assets of discontinued operations	$	74,136	$	59,525
Liabilities
Accounts payable	$	11,435	$	3,147
Energy marketing and risk management liabilities		629		1,053
Other liabilities		751		8,009
Liabilities of discontinued operations	$	12,815	$	12,209

At December 31, 2011 and 2010, the liabilities of our discontinued operations exclude $45.7 million and $40.2 million, respectively, of intercompany payables due to its parent or other affiliates.

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C.           FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for our continuing and discontinued operations for the periods indicated:

	December 31, 2011
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	545,247		$	13,874		$	32,931		$	-		$	592,052
Physical contracts		-			23,879			14,916			-			38,795
Netting		-			-			-			(569,243	)		(569,243	)
Total derivatives		545,247			37,753			47,847			(569,243	)		61,604
Trading securities (b)		5,749			-			-			-			5,749
Available-for-sale investment securities (c)		1,949			-			-			-			1,949
Total assets	$	552,945		$	37,753		$	47,847		$	(569,243	)	$	69,302
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(479,073	)	$	(6,498	)	$	(20,995	)	$	-		$	(506,566	)
Physical contracts		-			(261	)		(1,748	)		-			(2,009	)
Netting		-			-			-			497,608			497,608
Interest-rate contracts		-			(128,666	)		-			-			(128,666	)
Total derivatives		(479,073	)		(135,425	)		(22,743	)		497,608			(139,633	)
Fair value of firm commitments (d)		-			-			(7,283	)		-			(7,283	)
Total liabilities	$	(479,073	)	$	(135,425	)	$	(30,026	)	$	497,608		$	(146,916	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2011, we held $73.3 million of cash collateral and had posted $1.7 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred assets.

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	December 31, 2010
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	127,789		$	1,755		$	152,639		$	-		$	282,183
Physical contracts		-			13,185			20,391			-			33,576
Netting		-			-			-			(251,898	)		(251,898	)
Total derivatives		127,789			14,940			173,030			(251,898	)		63,861
Trading securities (b)		7,591			-			-			-			7,591
Available-for-sale investment securities (c)		2,574			-			-			-			2,574
Total assets	$	137,954		$	14,940		$	173,030		$	(251,898	)	$	74,026
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(64,768	)	$	(3,241	)	$	(119,430	)	$	-		$	(187,439	)
Physical contracts		-			(3,763	)		(4,334	)		-			(8,097	)
Netting		-			-			-			170,515			170,515
Total derivatives		(64,768	)		(7,004	)		(123,764	)		170,515			(25,021	)
Fair value of firm commitments (d)		-			-			(29,536	)		-			(29,536	)
Total liabilities	$	(64,768	)	$	(7,004	)	$	(153,300	)	$	170,515		$	(54,557	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2010, we held $82.5 million of cash collateral and had posted $1.1 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred credits.

The tables above include balances for ONEOK Energy Marketing Company that have been reflected as a discontinued component in our Consolidated Balance Sheets.  At December 31, 2011, we had $15.0 million in derivative assets and $0.6 million in derivative liabilities related to this discontinued operation.  At December 31, 2010, we had $7.7 million in derivative assets and $1.1 million in derivative liabilities related to this discontinued operation.

Our Level 1 fair value measurements are based on NYMEX-settled prices and actively quoted prices for equity securities.  These balances are comprised predominantly of exchange-traded derivative contracts, including futures and certain options for natural gas and crude oil, which are valued based on unadjusted quoted prices in active markets.  Also included in Level 1 are equity securities.

Our Level 2 fair value inputs are based on NYMEX-settled prices for natural gas and crude oil that are utilized to determine the fair value of certain nonexchange-traded financial instruments, including natural gas and crude oil swaps, as well as physical forwards.  Also, included in Level 2 are interest-rate swaps that are valued using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest swap settlements.

Our Level 3 inputs include internally developed basis curves incorporating observable and unobservable market data, NGL price curves from broker quotes, market volatilities derived from the most recent NYMEX close spot prices and forward LIBOR curves, and adjustments for the credit risk of our counterparties.  We corroborate the data on which our fair value estimates are based using our market knowledge of recent transactions, analysis of historical correlations and validation with independent broker quotes.  The derivatives categorized as Level 3 include natural gas basis swaps, swing swaps, options, other commodity swaps and physical forward contracts.  Also included in Level 3 are the fair values of firm commitments.  We do not believe that our Level 3 fair value estimates have a material impact on our results of operations, as the majority of our derivatives are accounted for as hedges for which ineffectiveness is not material.

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The following tables set forth the reconciliation of our Level 3 fair value measurements for the periods indicated:

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2011	$	49,266		$	(29,536	)	$	19,730
Total realized/unrealized gains (losses):
Included in earnings (a)		(28,425	)		22,253			(6,172	)
Included in other comprehensive income (loss)		5,443			-			5,443
Transfers into Level 3		1,428			-			1,428
Transfers out of Level 3		(2,608	)		-			(2,608	)
December 31, 2011	$	25,104		$	(7,283	)	$	17,821
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2011 (a)	$	21,349		$	(6,581	)	$	14,768
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2010	$	136,694		$	(134,620	)	$	2,074
Total realized/unrealized gains (losses):
Included in earnings (a)		(91,662	)		105,084			13,422
Included in other comprehensive income (loss)		11,122			-			11,122
Transfers into Level 3		765			-			765
Transfers out of Level 3		(7,653	)		-			(7,653	)
December 31, 2010	$	49,266		$	(29,536	)	$	19,730
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2010 (a)	$	22,101		$	(4,551	)	$	17,550
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

Realized/unrealized gains (losses) include the realization of our derivative contracts through maturity and changes in fair value of our hedged firm commitments.

Other Financial Instruments -The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and notes payable is equal to book value, due to the short-term nature of these items.

The estimated fair value of our consolidated long-term debt, including current maturities, was $5.6 billion and $4.7 billion at December 31, 2011 and 2010, respectively.  The book value of long-term debt, including current maturities, was $4.9 billion and $4.3 billion at December 31, 2011 and 2010, respectively.  The estimated fair value of long-term debt has been determined using quoted market prices of ONEOK’s and ONEOK Partners’ senior notes or similar issues with similar terms and maturities.

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D.           RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Our Energy Services and ONEOK Partners segments are exposed to various risks that we manage by periodically entering into derivative instruments.  These risks include the following:

·   Commodity price risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs and crude oil.  We use commodity derivative instruments such as futures, physical forward contracts, swaps and options to reduce the commodity price risk associated with a portion of the forecasted purchases and sales of commodities and natural gas and natural gas liquids in storage.  Commodity price volatility may have a significant impact on the fair value of our derivative instruments as of a given date;

·   Basis risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price differentials between pipeline receipt and delivery locations.  Our firm transportation capacity allows us to purchase natural gas at a pipeline receipt point and sell natural gas at a pipeline delivery point.  As market conditions permit, our Energy Services segment periodically enters into basis swaps between the transportation receipt and delivery points in order to protect the fair value of these location price differentials related to our firm commitments;

·   Currency exchange rate risk - As a result of our Energy Services segment’s activities in Canada, we are exposed to the risk of loss in cash flows and future earnings from adverse changes in currency exchange rates on our commodity purchases and sales, primarily related to our firm transportation and storage contracts that are transacted in a currency other than our functional currency, the United States dollar.  To reduce our exposure to exchange-rate fluctuations, we use physical forward transactions, which result in an actual two-way flow of currency on the settlement date in which we exchange United States dollars for Canadian dollars with another party; and

·   Interest-rate risk - We are also subject to fluctuations in interest rates.  We manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and, at times, interest-rate swaps.

The following derivative instruments are used to manage our exposure to these risks:

·   Futures contracts - Standardized exchange-traded contracts to purchase or sell natural gas and crude oil at a specified price, requiring delivery on or settlement through the sale or purchase of an offsetting contract by a specified future date under the provisions of exchange regulations;

·   Forward contracts - Commitments to purchase or sell natural gas, crude oil or NGLs for physical delivery at some specified time in the future.  We also use currency forward contracts to manage our currency exchange rate risk.  Forward contracts are different from futures in that forwards are customized and nonexchange traded;

·   Swaps - Financial trades involving the exchange of payments based on two different pricing structures for a commodity or other instrument.  In a typical commodity swap, parties exchange payments based on changes in the price of a commodity or a market index, while fixing the price they effectively pay or receive for the physical commodity.  As a result, one party assumes the risks and benefits of movements in market prices, while the other party assumes the risks and benefits of a fixed price for the commodity.  Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts; and

·   Options - Contractual agreements that give the holder the right, but not the obligation, to buy or sell a fixed quantity of a commodity, at a fixed price, within a specified period of time.  Options may either be standardized and exchange traded or customized and nonexchange traded.

Our objectives for entering into such contracts include but are not limited to:

·   reducing the variability of cash flows by locking in the price for all or a portion of anticipated index-based physical purchases and sales, transportation fuel requirements, asset management transactions and customer-related business activities;

·   locking in a price differential to protect the fair value between transportation receipt and delivery points and to protect the fair value of natural gas or NGLs that are purchased in one month and sold in a later month;

·   reducing our exposure to fluctuations in interest and foreign currency exchange rates; and

·   reducing variability in cash flows from changes in interest rates associated with forecasted debt issuances.

Our Energy Services segment also enters into derivative contracts for financial trading purposes primarily to capitalize on opportunities created by market volatility, weather-related events, supply-demand imbalances and market liquidity inefficiencies, which allow us to capture additional margin.  Financial trading activities are executed generally using financially settled derivatives and are normally short term in nature.

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With respect to the net open positions that exist within our marketing and financial trading operations, fluctuating commodity prices can impact our financial position and results of operations.  The net open positions are actively managed, and the impact of the changing prices on our financial condition at a point in time is not necessarily indicative of the impact of price movements throughout the year.

Our Natural Gas Distribution segment also uses derivative instruments to hedge the cost of a portion of anticipated natural gas purchases during the winter heating months to protect our customers from upward volatility in the market price of natural gas.  The use of these derivative instruments and the associated recovery of these costs have been approved by the OCC, KCC and regulatory authorities in certain of our Texas jurisdictions.

At December 31, 2011, ONEOK and ONEOK Partners had forward-starting interest-rate swaps with notional amounts of $500 million and $750 million, respectively, that have been designated as cash flow hedges of the variability of interest payments on a portion of forecasted debt issuances that may result from changes in the benchmark interest rate before the debt is issued.  In January 2012, ONEOK entered into an additional interest-rate swap that was designated as a cash flow hedge with a notional amount of $200 million.  Upon issuance in January 2012 of our $700 million of 4.25-percent senior notes due 2022, ONEOK settled its swaps and realized a loss of $44.1 million that will be amortized to interest expense over the term of the debt.  At December 30, 2010, ONEOK and ONEOK Partners did not have any interest-rate swap agreements.

Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments for our continuing and discontinued operations for the periods indicated:

	December 31, 2011						December 31, 2010
	Fair Values of Derivatives (a)						Fair Values of Derivatives (a)
	Assets			(Liabilities)			Assets			(Liabilities)
	(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts
Financial contracts	$	184,184	(b)	$	(73,346	)	$	136,040	(c)	$	(23,843	)
Physical contracts		62			(344	)		-			(883	)
Interest-rate contracts		-			(128,666	)		-			-
Total derivatives designated as hedging instruments		184,246			(202,356	)		136,040			(24,726	)
Derivatives not designated as hedging instruments
Commodity contracts
Nontrading instruments
Financial contracts		295,948			(323,170	)		125,503			(144,940	)
Physical contracts		38,733			(1,665	)		33,576			(7,214	)
Trading instruments
Financial contracts		111,920			(110,050	)		20,640			(18,656	)
Total derivatives not designated as hedging instruments		446,601			(434,885	)		179,719			(170,810	)
Total derivatives	$	630,847		$	(637,241	)	$	315,759		$	(195,536	)
(a) - Included on a net basis in energy marketing and risk-management assets and liabilities on our Consolidated Balance Sheets.
(b) - Includes $88.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.
(c) - Includes $44.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.

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Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for our continuing and discontinued operations for the periods indicated:

					December 31, 2011		December 31, 2010
				Contract Type	Purchased/ Payor	Sold/ Receiver	Purchased/ Payor	Sold/ Receiver
Derivatives designated as hedging instruments:
	Cash flow hedges
		Fixed price
			- Natural gas (Bcf)	Exchange futures	21.2	(23.4)	0.4	(7.6)
				Swaps	19.5	(111.9)	3.0	(69.9)
			- Crude oil and NGLs (MMBbl)	Swaps	-	(2.9)	-	(1.5)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	3.2	(82.8)	2.8	(64.9)
		Interest-rate contracts (Millions of dollars)		Forward-starting swaps	$1,250.0	-	-	-
	Fair value hedges
		Basis
			- Natural gas (Bcf)	Forwards and swaps	76.5	(77.0)	141.1	(141.1)
Derivatives not designated as hedging instruments:
		Fixed price
			- Natural gas (Bcf)	Exchange futures	76.9	(59.6)	34.6	(20.6)
				Forwards and swaps	235.8	(253.4)	73.6	(100.3)
				Options	33.6	(14.3)	81.0	(74.3)
			- Crude and NGLs (MMBbl)	Forwards and swaps	-	-	0.6	(0.6)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	216.9	(219.3)	411.5	(419.7)
		Index
			- Natural gas (Bcf)	Forwards and swaps	29.3	(22.1)	33.6	(6.1)

These notional amounts are used to summarize the volume of financial instruments; however, they do not reflect the extent to which the positions offset one another and consequently do not reflect our actual exposure to market or credit risk.

Cash Flow Hedges -Our Energy Services and ONEOK Partners segments use derivative instruments to hedge the cash flows associated with anticipated purchases and sales of natural gas, NGLs and condensate and cost of fuel used in the transportation of natural gas.  Accumulated other comprehensive income (loss) at December 31, 2011, includes net losses of approximately $1.8 million, net of tax, related to these hedges that will be recognized within the next 24 months as the forecasted transactions affect earnings.  If prices remain at current levels, we will recognize $12.8 million in net losses over the next 12 months, and we will recognize net gains of $11.0 million thereafter.  The amounts deferred in accumulated comprehensive income (loss) attributable to our interest-rate swaps will be amortized to interest expense over the life of long-term, fixed-rate debt upon issuance of the debt.

In 2011 and 2010, cost of sales and fuel in our Consolidated Statements of Income includes $91.1 million and $58.7 million in each period, respectively, reflecting an adjustment to natural gas inventory at the lower of cost or market value.  In each period, we reclassified $91.1 million and $58.7 million, respectively, of deferred gains, before income taxes, on associated cash flow hedges from accumulated other comprehensive income (loss) into earnings.

The following table sets forth the effect of cash flow hedges recognized in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
Derivatives in Cash Flow Hedging Relationships	2011			2010		2009
	(Thousands of dollars)
Commodity contracts	$	117,508		$	128,662	$	49,344
Interest rate contracts		(128,666	)		-		1,599
Total gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	$	(11,158	)	$	128,662	$	50,943

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The following tables set forth the effect of cash flow hedges on our Consolidated Statements of Income for the periods indicated:

	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income  (Loss) into Net Income (Effective Portion)
Derivatives in Cash Flow			Years Ended December 31,
Hedging Relationships			2011			2010		2009
			(Thousands of dollars)
Commodity contracts	Revenues	$	48,601		$	68,209	$	188,144
Commodity contracts	Cost of sales and fuel		89,618			9,158		(36,776	)
Interest rate contracts	Interest expense		(480	)		28		1,240
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)		$	137,739		$	77,395	$	152,608

Ineffectiveness related to our cash flow hedges was not material for the years ended December 31, 2011, 2010 and 2009.  In the event that it becomes probable that a forecasted transaction will not occur, we will discontinue cash flow hedge treatment, which will affect earnings.  For the years ended December 31, 2011, 2010 and 2009, there were no gains or losses due to the discontinuance of cash flow hedge treatment as a result of the underlying transactions being no longer probable.

Other Derivative Instruments - The following table sets forth the effect of our derivative instruments that are not part of a hedging relationship on our Consolidated Statements of Income for our continuing and discontinued operations for the periods indicated:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss)		Years Ended December 31,
			2011		2010		2009
			(Thousands of dollars)
Commodity contracts - trading	Revenues	$	1,796	$	5,710	$	3,210
Commodity contracts - non-trading (a)	Cost of sales and fuel		16,178		5,371		10,085
Foreign exchange contracts	Revenues		-		18		886
Total gain recognized in income on derivatives		$	17,974	$	11,099	$	14,181
(a) - Amounts are presented net of deferred losses associated with derivatives entered into by our Natural Gas Distribution segment.

Our Natural Gas Distribution segment held natural gas call options with premiums totaling $10.0 million and $16.7 million at December 31, 2011 and 2010, respectively.  The premiums are recorded in other current assets as these contracts are included in, and recoverable through, the monthly purchased-gas cost mechanism.  We recorded losses associated with the decline in the value and expiration of option contracts totaling approximately $14.5 million, $25.5 million and $22.6 million for the years ended December 31, 2011, 2010 and 2009, respectively, which were deferred as part of our unrecovered purchased-gas costs.

Fair Value Hedges - In prior years, we terminated various interest-rate swap agreements that had been designated as fair value hedges.  The net savings from the termination of these swaps is being recognized in interest expense over the terms of the debt instruments originally hedged.  Interest expense savings from the amortization of terminated swaps for 2011, 2010 and 2009, were $4.3 million, $10.2 million and $10.3 million, respectively.

Our Energy Services segment uses basis swaps to hedge the fair value of price location differentials related to certain firm transportation commitments.  Cost of sales and fuel in our Consolidated Statements of Income includes gains of $14.6 million, $2.4 million and $253.2 million for 2011, 2010 and 2009, respectively, related to the change in fair value of derivatives designated as fair value hedges.  Revenues include losses of $13.8 million, $2.7 million and $250.5 million for 2011, 2010 and 2009, respectively, to recognize the change in fair value of the related hedged firm commitments.  Ineffectiveness included in cost of sales and fuel related to these hedges was immaterial for the years ended December 31, 2011, 2010 and 2009.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee.  We maintain credit policies with regard to our counterparties that we believe minimize overall credit risk.  These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty.  We have counterparties whose credit is not rated, and for those customers we use internally developed credit ratings.

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Some of our derivative instruments contain provisions that require us to maintain an investment-grade credit rating from S&P and/or Moody’s.  If our credit ratings on senior unsecured long-term debt were to decline below investment grade, we would be in violation of these provisions, and the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions.  The aggregate fair value of all financial derivative instruments with contingent features related to credit risk that were in a net liability position as of December 31, 2011, was $5.9 million.  If the contingent features underlying these agreements were triggered on December 31, 2011, we would have been required to post an additional $5.9 million of collateral to our counterparties.

The counterparties to our derivative contracts consist primarily of major energy companies, LDCs, electric utilities, financial institutions and commercial and industrial end-users.  This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions.  Based on our policies, exposures, credit and other reserves, we do not anticipate a material adverse effect on our financial position or results of operations as a result of counterparty nonperformance.

The following tables set forth the net credit exposure from our derivative assets for the period indicated:

	December 31, 2011
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	22,335	$	-	$	564	$	22,899
Oil and gas		9,986		5		80		10,071
Industrial		7		-		14,955		14,962
Financial		13,566		-		-		13,566
Other		100		6		-		106
Total	$	45,994	$	11	$	15,599	$	61,604

	December 31, 2010
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	33,847	$	1,240	$	678	$	35,765
Oil and gas		8,995		35		2,091		11,121
Industrial		18		-		7,682		7,700
Financial		9,254		-		-		9,254
Other		-		-		21		21
Total	$	52,114	$	1,275	$	10,472	$	63,861

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E.           PROPERTY, PLANT AND EQUIPMENT

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful	December 31,			December 31,
	Lives (Years)	2011			2010
		(Thousands of dollars)
Non-Regulated
Gathering pipelines and related equipment	5 to 46	$	1,350,227		$	1,144,753
Processing and fractionation and related equipment	5 to 42		1,294,586			993,100
Storage and related equipment	5 to 54		299,610			263,125
Transmission pipelines and related equipment	15 to 54		182,863			198,373
General plant and other	2 to 42		288,445			297,407
Construction work in process	-		725,944			228,862
Regulated
Natural gas distribution pipelines and related equipment	15 to 80		3,309,876			3,160,197
Storage and related equipment	5 to 54		136,971			133,314
Natural gas transmission pipelines and related equipment	5 to 77		1,771,752			1,717,276
Natural gas liquids transmission pipelines and related equipment	5 to 80		1,436,500			1,351,245
General plant and other	2 to 85		291,642			261,783
Construction work in process	-		89,518			104,386
Property, plant and equipment			11,177,934			9,853,821
Accumulated depreciation and amortization - non-regulated			(811,644	)		(707,535	)
Accumulated depreciation and amortization - regulated			(1,921,957	)		(1,833,338	)
Net property, plant and equipment		$	8,444,333		$	7,312,948

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
Regulated Property	2011	2010	2009
ONEOK Partners	1.9% - 2.2%	1.9% - 2.2%	1.8% - 2.2%
Natural Gas Distribution	2.0% - 2.9%	2.1% - 2.8%	2.6% - 2.7%

F.           GOODWILL AND INTANGIBLE ASSETS

Goodwill - The following table sets forth our goodwill, by segment, at both December 31, 2011 and 2010:

	December 31,		December 31,
	2011		2010
	(Thousands of dollars)
ONEOK Partners	$	433,535	$	433,537
Natural Gas Distribution		157,953		157,953
Energy Services		10,255		10,255
Other		-		1,099
Total goodwill	$	601,743	$	602,844

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Intangible Assets - The following table sets forth the gross carrying amount and accumulated amortization of intangible assets for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Gross intangible assets	$	462,214		$	462,214
Accumulated amortization		(49,830	)		(42,164	)
Net intangible assets	$	412,384		$	420,050

At December 31, 2011 and 2010, our ONEOK Partners segment has $256.8 million and $264.5 million, respectively, of intangible assets related primarily to contracts acquired through acquisition, which are being amortized over an aggregate weighted-average period of 40 years.  The remaining intangible asset balance has an indefinite life.  Amortization expense for intangible assets for 2011, 2010 and 2009 was $7.7 million each year, and the aggregate amortization expense for each of the next five years is estimated to be approximately $7.7 million.

G.           CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE

ONEOK 2011 Credit Agreement -In April 2011, ONEOK entered into the five-year, $1.2 billion ONEOK 2011 Credit Agreement, which replaced the $1.2 billion ONEOK Credit Agreement that was scheduled to expire in July 2011.  The ONEOK 2011 Credit Agreement, which is scheduled to expire in April 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining ONEOK’s stand-alone debt-to-capital ratio of no more than 67.5 percent at the end of any calendar quarter, limitations on the ratio of indebtedness secured by liens and indebtedness of subsidiaries to consolidated net tangible assets, a requirement that ONEOK maintains the power to control the management and policies of ONEOK Partners, and a limit on new investments in master limited partnerships.

The ONEOK 2011 Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, investments, fundamental changes in the nature of ONEOK’s businesses, transactions with affiliates, the use of proceeds and a covenant that limits ONEOK’s ability to restrict its subsidiaries’ ability to pay dividends.  Under the terms of the ONEOK 2011 Credit Agreement, ONEOK may request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The debt covenant calculations in the ONEOK 2011 Credit Agreement exclude the debt of ONEOK Partners.  Upon breach of certain covenants by ONEOK, amounts outstanding under the ONEOK 2011 Credit Agreement may become due and payable immediately.  At December 31, 2011, ONEOK’s stand-alone debt-to-capital ratio, as defined by the ONEOK 2011 Credit Agreement, was 44.4 percent, and ONEOK was in compliance with all covenants under the ONEOK 2011 Credit Agreement.  At December 31, 2011, ONEOK had $842.0 million of commercial paper outstanding and $2.0 million in letters of credit issued, leaving approximately $356.0 million of credit available under the ONEOK 2011 Credit Agreement.

The ONEOK 2011 Credit Agreement is available to repay our commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK 2011 Credit Agreement.  The ONEOK 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating.  Borrowings, if any, will accrue at LIBOR plus 150 basis points, and the annual facility fee is 25 basis points based on our current credit rating.

The weighted-average interest rate on ONEOK’s short-term debt outstanding was 0.50 percent and 0.38 percent at December 31, 2011 and 2010, respectively.

ONEOK Partners 2011 Credit Agreement - In August 2011, ONEOK Partners entered into the five-year, $1.2 billion ONEOK Partners 2011 Credit Agreement, which replaced the $1.0 billion ONEOK Partners Credit Agreement that was due to expire in March 2012.  The ONEOK Partners 2011 Credit Agreement, which is scheduled to expire in August 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in the ONEOK Partners 2011 Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1.  If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will increase to 5.5 to 1 for the three calendar quarters following the acquisitions.  Upon breach of certain covenants by ONEOK Partners in the ONEOK Partners 2011 Credit Agreement, amounts outstanding under the ONEOK Partners 2011 Credit Agreement, if any, may become due and payable immediately.

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The ONEOK Partners 2011 Credit Agreement includes a $100-million sublimit for the issuance of standby letters of credit and also features an option to request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The ONEOK Partners 2011 Credit Agreement is available to repay ONEOK Partners’ commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK Partners 2011 Credit Agreement.  The ONEOK Partners 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in ONEOK Partners’ credit rating.  Borrowings, if any, will accrue at LIBOR plus 130 basis points, and the annual facility fee is 20 basis points based on ONEOK Partners’ current credit rating.  The ONEOK Partners 2011 Credit Agreement is guaranteed fully and unconditionally by ONEOK Partners’ wholly owned subsidiary, ONEOK Partners Intermediate Limited Partnership.  Borrowings under the ONEOK Partners 2011 Credit Agreement are nonrecourse to ONEOK.

At December 31, 2011, ONEOK Partners’ ratio of indebtedness to adjusted EBITDA was 2.9 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners 2011 Credit Agreement.  At December 31, 2011, ONEOK Partners had no commercial paper outstanding, no letters of credit issued and no borrowings under the ONEOK Partners 2011 Credit Agreement.  The weighted-average interest rate on ONEOK Partners’ short-term debt outstanding was 0.38 percent at December 31, 2010.

Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments to unaffiliated parties, and ONEOK does not guarantee the debt or other similar commitments of ONEOK Partners.

H.           LONG-TERM DEBT

All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.  The following table sets forth our long-term debt for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
ONEOK
$400,000 at 7.125% due 2011	$	-		$	400,000
$400,000 at 5.2% due 2015		400,000			400,000
$100,000 at 6.4% due 2019		-			90,091
$100,000 at 6.5% due 2028		87,735			87,971
$100,000 at 6.875% due 2028		100,000			100,000
$400,000 at 6.0% due 2035		400,000			400,000
Other		1,858			2,163
Total ONEOK senior notes payable		989,593			1,480,225
ONEOK Partners
$225,000 at 7.10% due 2011		-			225,000
$350,000 at 5.90% due 2012		350,000			350,000
$650,000 at 3.25% due 2016		650,000			-
$450,000 at 6.15% due 2016		450,000			450,000
$500,000 at 8.625% due 2019		500,000			500,000
$600,000 at 6.65% due 2036		600,000			600,000
$600,000 at 6.85% due 2037		600,000			600,000
$650,000 at 6.125% due 2041		650,000			-
Guardian Pipeline
Average 7.85%, due 2022		85,919			97,850
Total ONEOK Partners senior notes payable		3,885,919			2,822,850
Total long-term notes payable		4,875,512			4,303,075
Unamortized portion of terminated swaps		28,776			33,113
Unamortized debt discount		(10,346	)		(6,410	)
Current maturities		(364,391	)		(643,236	)
Long-term debt	$	4,529,551		$	3,686,542

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The aggregate maturities of long-term debt outstanding for the years 2012 through 2016 are shown below:

			ONEOK		Guardian
	ONEOK		Partners		Pipeline			Total
		(Millions of dollars)
2012	$	3.3	$	350.0	$	11.1	$	364.4
2013	$	3.2	$	-	$	7.7	$	10.9
2014	$	3.0	$	-	$	7.7	$	10.7
2015	$	403.0	$	-	$	7.7	$	410.7
2016	$	3.0	$	1,100.0	$	7.7	$	1,110.7

Additionally, our senior notes due 2028 (6.5 percent) are callable at par at our option from now until maturity.

ONEOK Debt Repayments - In 2011, ONEOK repaid $400 million of maturing senior notes and redeemed $90.5 million of 6.4-percent senior notes with available cash and short-term borrowings.

ONEOK Debt Issuance - In January 2012, we completed an underwritten public offering of $700 million of 4.25-percent senior notes due 2022.  The net proceeds from the offering, after deducting underwriting discounts and offering expenses, of approximately $693.9 million were used to repay amounts outstanding under our $1.2 billion commercial paper program and general corporate purposes, which may include one or more of the following:  the repurchase of our common stock, the purchase of additional common units of ONEOK Partners and the payment of dividends.  We will pay interest on the senior notes due 2022 on February 1 and August 1 of each year, beginning August 1, 2012.

ONEOK Debt Covenants - The indentures governing ONEOK’s senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK’s senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK’s existing and future unsecured senior indebtedness.

ONEOK Partners’ Debt Issuance and Maturities - In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041.  The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners’ commercial paper program, to repay the $225 million of ONEOK Partners’ senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

ONEOK Partners intends to repay its $350 million 5.9-percent senior notes that mature in April 2012 with a combination of cash on hand and short-term borrowings.

ONEOK Partners’ Debt Covenants - The indentures governing ONEOK Partners’ senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners’ outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior

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notes on the same terms as its other senior notes.  ONEOK Partners’ senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners’ existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners’ senior notes are nonrecourse to ONEOK.

ONEOK Partners’ Debt Guarantee - ONEOK Partners’ senior notes are guaranteed on a senior unsecured basis by the Intermediate Partnership.  The Intermediate Partnership’s guarantee is full and unconditional, subject to certain customary automatic release provisions.  The guarantee ranks equally in right of payment to all of the Intermediate Partnership’s existing and future unsecured senior indebtedness.  ONEOK Partners has no significant assets or operations other than its investment in the Intermediate Partnership, which is also consolidated.  At December 31, 2011, the Intermediate Partnership held the equity of ONEOK Partners’ subsidiaries, as well as a 50-percent interest in Northern Border Pipeline.  ONEOK Partners’ long-term debt is nonrecourse to ONEOK.

Guardian Pipeline Senior Notes - These senior notes were issued under a master shelf agreement dated November 8, 2001, with certain financial institutions.  Principal payments are due quarterly through 2022.  Interest rates on the $85.9 million in senior notes outstanding at December 31, 2011, range from 7.61 percent to 8.27 percent, with an average rate of 7.85 percent.  Guardian Pipeline’s senior notes contain financial covenants that require the maintenance of a ratio of (i) EBITDAR, as defined in the master shelf agreement to fixed charges (interest expense plus operating lease expense) of not less than 1.5 to 1; and (ii) total indebtedness to EBITDAR of not greater than 4.75 to 1.  Upon any breach of these covenants, all amounts outstanding under the master shelf agreement may become due and payable immediately.  At December 31, 2011, Guardian Pipeline’s EBITDAR-to-fixed-charges ratio was 6.5 to 1, the ratio of total indebtedness to EBITDAR was 1.8 to 1, and Guardian Pipeline was in compliance with its financial covenants.

Interest-rate Swaps - See Note D for a discussion of our interest-rate swaps.

Other - We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

I.           EQUITY

Series A and B Convertible Preferred Stock - There are no shares of Series A or Series B Preferred Stock currently issued or outstanding.

Series C Preferred Stock -Series C Preferred Stock (Series C) is designed to protect our shareholders from coercive or unfair takeover tactics.  If issued, holders of shares of Series C are entitled to receive, in preference to the holders of ONEOK Common Stock, quarterly dividends in an amount per share equal to the greater of $0.50 or, subject to adjustment, 100 times the aggregate per share amount of all cash dividends, and 100 times the aggregate per share amount (payable in kind) of all noncash dividends.  No shares of Series C have been issued.

Common Stock - At December 31, 2011, we had approximately 179.8 million shares of authorized and unreserved common stock available for issuance.

Stock Split - On February 15, 2012, our Board of Directors authorized a two-for-one split of our common stock, subject to shareholder approval of a proposal to increase the number of authorized shares of our common stock to 600 million from 300 million.  The proposal will be voted on at our 2012 annual meeting of shareholders on May 23, 2012.

Dividends - Dividends paid totaled $227.0 million, $193.5 million and $172.8 million for 2011, 2010 and 2009, respectively.  The following table sets forth the quarterly dividends per share declared and paid on our common stock for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
First Quarter	$	0.52	$	0.44	$	0.40
Second Quarter	$	0.52	$	0.44	$	0.40
Third Quarter	$	0.56	$	0.46	$	0.42
Fourth Quarter	$	0.56	$	0.48	$	0.42
Total	$	2.16	$	1.82	$	1.64

Additionally, a quarterly dividend of $0.61 per share was declared in January 2012, payable in the first quarter of 2012.

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Stock Repurchase Plan - In 2011, we repurchased approximately 4.3 million shares of our common stock for approximately $300 million pursuant to an accelerated stock repurchase agreement.  The 2011 stock repurchase was part of our three-year stock repurchase program to buy up to $750 million of our common stock that was authorized by our Board of Directors in October 2010.

J.           ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table sets forth the balance in accumulated other comprehensive income (loss) for the periods indicated:

	Unrealized Gains  (Losses) on Energy  Marketing and Risk Management  Assets/Liabilities		Unrealized Holding Gains (Losses) on Investment Securities		Pension and  Postretirement  Benefit Plan  Obligations		Accumulated  Other  Comprehensive  Income (Loss)
		(Thousands of dollars)
January 1, 2010	$	(6,151)	$	1,441	$	(113,903)	$	(118,613)
Other comprehensive income (loss)    attributable to ONEOK		21,882		(70)		(12,001)		9,811
December 31, 2010		15,731		1,371		(125,904)		(108,802)
Other comprehensive income (loss)    attributable to ONEOK		(71,098)		(384)		(25,837)		(97,319)
December 31, 2011	$	(55,367)	$	987	$	(151,741)	$	(206,121)

K.           EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

	Year Ended December 31, 2011
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	358,364		104,672	$	3.42
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		2,577
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	358,364		107,249	$	3.34

	Year Ended December 31, 2010
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	333,360		106,368	$	3.14
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		1,417
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	333,360		107,785	$	3.09

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	Year Ended December 31, 2009
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	297,904		105,362	$	2.83
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		958
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	297,904		106,320	$	2.80

There were no option shares excluded from the calculation of diluted EPS for 2011 and 2010.  There were 192,952 option shares excluded from the calculation of diluted EPS for 2009 since their inclusion would be antidilutive.

L.           SHARE-BASED PAYMENTS

Equity Compensation Plan

The ONEOK, Inc. Equity Compensation Plan provides for the granting of stock-based compensation, including incentive stock options, nonstatutory stock options, stock bonus awards, restricted stock awards, restricted stock unit awards, performance stock awards and performance unit awards to eligible employees and the granting of stock awards to nonemployee directors.  We have reserved a total of 5.0 million shares of common stock for issuance under the plan, and at December 31, 2011, we had 2.2 million shares available for issuance under the plan.  The Equity Compensation Plan allows for the deferral of awards granted in stock or cash, in accordance with Internal Revenue Code section 409A requirements.

Restricted Stock Units - Restricted stock units may be granted to key employees with ownership of the common stock underlying the unit vesting over a period determined by the Executive Compensation Committee of our Board of Directors (the Executive Compensation Committee).  Awards outstanding vest over a three-year period and entitle the grantee to receive shares of our common stock.  Restricted stock unit awards are measured at fair value as if they were vested and issued on the grant date, reduced by expected dividend payments and adjusted for estimated forfeitures.No dividends are paid on the restricted stock units.  Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Performance Unit Awards -Performance unit awards may be granted to key employees.  The shares of our common stock underlying the performance units vest at the expiration of a period determined by the Executive Compensation Committee if certain performance criteria are met by us.  Outstanding performance units vest at the expiration of a three-year period.  Upon vesting, a holder of performance units is entitled to receive a number of shares of our common stock equal to a percentage (0 percent to 200 percent) of the performance units granted based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other energy companies over the same period.  Compensation expense is recognized on a straight-line basis over the period of the award.

If paid, the outstanding performance unit awards entitle the grantee to receive the grant in shares of our common stock.  Our outstanding performance unit awards are equity awards with a market-based condition, which results in the compensation cost for these awards being recognized over the requisite service period, provided that the requisite service period is fulfilled, regardless of when, if ever, the market condition is satisfied.  The fair value of these performance units was estimated on the grant date based on a Monte Carlo model.The compensation expense on these awards will only be adjusted for changes in forfeitures.

Long-Term Incentive Plan

The ONEOK, Inc. Long-Term Incentive Plan (the LTIP) provides for the granting of stock awards similar to those described above with respect to the Equity Compensation Plan.  We have reserved a total of approximately 7.8 million shares of common stock for issuance under the plan.  The maximum number of shares for which options or other awards may be granted to any employee during any year is 300,000.

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Options - Stock options may be granted that are not exercisable until a fixed future date or in installments.  All outstanding options issued to date have vested and must be exercised no later than 10 years after grant date.  Options issued to date become void upon involuntary termination of employment for just cause or voluntary termination of employment other than retirement.  In the event of retirement or involuntary termination other than for just cause, the optionee may exercise the option within a period determined by the Executive Compensation Committee and stated in the option.  In the event of death, the option may be exercised by the personal representative of the optionee within a period to be determined by the Committee and stated in the option.  No stock options have been granted since 2003.

Stock Compensation Plan for Non-Employee Directors

The ONEOK, Inc. Stock Compensation Plan for Non-Employee Directors (the DSCP) provides for the granting of stock options, stock bonus awards, including performance unit awards, restricted stock awards and restricted stock unit awards.  Under the DSCP, these awards may be granted by the Executive Compensation Committee at any time, until grants have been made for all shares authorized under the DSCP.  We have reserved a total of 700,000 shares of common stock for issuance under the DSCP.  The maximum number of shares of common stock which can be issued to a participant under the DSCP during any year is 20,000.  No performance unit awards or restricted stock awards have been made to nonemployee directors under the DSCP.

General

For all awards outstanding, we used a forfeiture rate ranging from zero percent to 12 percent based on historical forfeitures under our share-based payment plans.  We primarily use issuances from treasury stock to satisfy our share-based payment obligations.

Compensation cost expensed for our share-based payment plans described below was $40.7 million, $15.9 million and $15.1 million during 2011, 2010 and 2009, respectively, which is net of $25.7 million, $10.0 million and $9.5 million of tax benefits, respectively.  Share-based compensation cost capitalized was not material for 2011 and we had no share-based compensation cost capitalized for 2010 and 2009.

Cash received from the exercise of awards under all share-based payment arrangements was $0.9 million, $6.0 million and $3.3 million for 2011, 2010 and 2009, respectively.  The tax benefit realized for the anticipated tax deductions of the exercise of share-based payment arrangements totaled $1.8 million, $3.4 million and $0.9 million for 2011, 2010 and 2009, respectively.

Stock Option Activity

The following table sets forth the stock option activity for employees and nonemployee directors for the periods indicated:

	Number of			Weighted
	Shares			Average Price
Outstanding December 31, 2010		135,190		$	21.52
Exercised		(105,540	)	$	22.78
Outstanding December 31, 2011		29,650		$	17.03
Exercisable December 31, 2011		29,650		$	17.03

The aggregate intrinsic value in the table below represents the total pre-tax intrinsic value, based on our year-end closing stock price of $86.69, that would have been received by the option holders had all option holders exercised their options as of December 31, 2011:

	Stock Options Outstanding and Exercisable
		Weighted				Aggregate
		Average		Weighted		Intrinsic
Range of	Number	Remaining		Average		Value
Exercise Prices	of Awards	Life (yrs)		Exercise Price		(in 000's)
$16.88 to $25.32	29,650	1.02	$	17.03	$	2,065

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As of December 31, 2011, all stock options were fully vested and expensed.  The following table sets forth statistics relating to our stock option activity:

	December 31, 2011		December 31, 2010		December 31, 2009
	(Thousands of dollars)
Intrinsic value of options exercised	$	4,756	$	8,953	$	2,453

Restricted Stock Unit Activity

As of December 31, 2011, there was $10.5 million of total unrecognized compensation cost related to our nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.13 years.  The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of			Weighted
	Shares			Average Price
Nonvested December 31, 2010		488,786		$	35.07
Granted		205,750		$	57.00
Released to participants		(1,271	)	$	29.26
Forfeited		(8,928	)	$	42.96
Nonvested December 31, 2011		684,337		$	41.57

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	57.00	$	37.33	$	23.47
Fair value of shares granted (thousands of dollars)	$	11,728	$	8,206	$	2,251

Performance Unit Activity

As of December 31, 2011, there was $7.4 million of total unrecognized compensation cost related to the nonvested performance unit awards, which is expected to be recognized over a weighted-average period of 1.09 years.  The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations of the 2011, 2010 and 2009 grants at the grant date:

	Number of			Weighted
	Units			Average Price
Nonvested December 31, 2010		1,314,587		$	40.30
Granted		420,850		$	69.35
Forfeited		(19,276	)	$	46.12
Nonvested December 31,  2011		1,716,161		$	47.36

	2011		2010		2009
Volatility (a)		39.91%		40.60%		43.58%
Dividend Yield		3.30%		4.12%		5.70%
Risk-free Interest Rate		1.33%		1.47%		1.01%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	69.35	$	48.09	$	29.34
Fair value of shares granted (thousands of dollars)	$	29,186	$	20,738	$	17,232

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Employee Stock Purchase Plan

We have reserved a total of 4.8 million shares of common stock for issuance under our ONEOK, Inc. Employee Stock Purchase Plan (the ESPP).  Subject to certain exclusions, all full-time employees are eligible to participate in the ESPP.  Employees can choose to have up to 10 percent of their annual base pay withheld to purchase our common stock, subject to terms and limitations of the plan.  The Executive Compensation Committee may allow contributions to be made by other means, provided that in no event will contributions from all means exceed 10 percent of the employee’s annual base pay.  The purchase price of the stock is 85 percent of the lower of its grant date or exercise date market price.  Approximately 56 percent, 53 percent and 53 percent of employees participated in the plan in 2011, 2010 and 2009, respectively.  Compensation expense for the ESPP was $7.2 million, $3.9 million and $6.5 million in 2011, 2010 and 2009, respectively.  Under the plan, we sold 182,558 shares at $47.39 in 2011, 216,897 shares at $37.95 per share in 2010 and 321,888 shares at $24.41 per share in 2009.

Employee Stock Award Program

Under our Employee Stock Award Program, we issued, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE was for the first time at or above $26 per share.  Shares issued to employees under this program during 2011 totaled 147,847, and compensation expense related to the Employee Stock Award Plan was $16.0 million.  For 2010, the number of shares issued under this program was immaterial, and there were no shares issued in 2009.

The total number of shares of our common stock available for issuance under this program was 300,000.  During 2011, the number of shares of our common stock available for distribution for issuance under this program was met.  Shareholder approval is required for further stock awards to be issued under the program.

Deferred Compensation Plan for Non-Employee Directors

The ONEOK, Inc. Nonqualified Deferred Compensation Plan for Non-Employee Directors provides our directors, who are not our employees, the option to defer all or a portion of their compensation for their service on our Board of Directors.  Under the plan, directors may elect either a cash deferral option or a phantom stock option.  Under the cash deferral option, directors may defer the receipt of all or a portion of their annual retainer fees, plus accrued interest.  Under the phantom stock option, directors may defer all or a portion of their annual retainer fees and receive such fees on a deferred basis in the form of shares of common stock under our Long-Term Incentive Plan or Equity Compensation Plan.  Shares are distributed to nonemployee directors at the fair market value of our common stock at the date of distribution.

M.           EMPLOYEE BENEFIT PLANS

Retirement and Postretirement Benefit Plans

Retirement Plans - We have a defined benefit pension plan covering nonbargaining unit employees hired prior to January 1, 2005, and certain bargaining unit employees.  Nonbargaining unit employees hired after December 31, 2004, employees represented by Local No. 304 of the IBEW hired on or after July 1, 2010, employees represented by the United Steelworkers hired on or after December 15, 2011, and employees who accepted a one-time opportunity to opt out of our pension plan, are covered by a profit-sharing plan.  In addition, we have a supplemental executive retirement plan for the benefit of certain officers.  No new participants in our supplemental executive retirement plan have been approved since 2005.  We fund our pension costs at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended, and the Pension Protection Act of 2006.

Postretirement Benefit Plans - We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  The postretirement medical plan is contributory based on hire date, age and years of service, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance.

In December 2011, we announced to participants a change from a self-insured postretirement medical plan to a fully insured solution for plan participants who have reached the age of 65 that coordinates with Medicare.  This announcement resulted in a $44.6 million reduction in our accumulated postretirement benefit obligation that was recognized in other comprehensive income and will be amortized to net periodic benefit cost over the expected remaining years of service for plan participants.

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Regulatory Treatment - The OCC, KCC and regulatory authorities in Texas have approved the recovery of pension costs and postretirement benefits costs through rates for Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively.  The costs recovered through rates are based on current funding requirements and the net periodic benefit cost for pension and postretirement costs.  Differences, if any, between the expense and the amount recovered through rates are reflected in earnings, net of authorized deferrals.

Our regulated entities historically have recovered pension and postretirement benefit costs through rates.  We believe it is probable that regulators will continue to include the net periodic pension and postretirement benefit costs in our regulated entities’ cost of service.  Accordingly, we have recorded a regulatory asset for the minimum liability associated with our regulated entities’ pension and postretirement benefit obligations that otherwise would have been recorded in accumulated other comprehensive income.

Obligations and Funded Status - The following tables set forth our pension and postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated.

	Pension Benefits								Postretirement Benefits
	December 31,								December 31,
	2011				2010				2011			2010
Change in Benefit Obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	1,098,232			$	997,003			$	295,483		$	267,666
Service cost		20,013				19,277				4,987			4,926
Interest cost		58,757				58,143				15,632			15,643
Plan participants' contributions		-				-				6,751			3,048
Actuarial (gain) loss		92,609				75,704				25,617			20,761
Benefits paid		(53,679	)			(51,895	)			(17,864	)		(16,561	)
Plan amendment		-				-				(44,562	)		-
Benefit obligation, end of period		1,215,932				1,098,232				286,044			295,483
Change in Plan Assets
Fair value of plan assets, beginning of period		904,089				748,686				117,585			92,360
Actual return on plan assets		(10,750	)			110,473				(4,876	)		12,677
Employer contributions		62,575		(a)		96,825		(b)		11,454			12,548
Benefits paid		(53,679	)			(51,895	)			-			-
Fair value of assets, end of period		902,235				904,089				124,163			117,585
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
Current liabilities	$	(4,545	)		$	(4,203	)		$	-		$	-
Non-current liabilities		(309,152	)			(189,940	)			(161,881	)		(177,898	)
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
(a) - Includes $62.6 million contributed for the 2012 plan year.
(b) - Includes $57.0 million contributed for the 2011 plan year.

The accumulated benefit obligation for our pension plans was $1,152.4 million and $1,041.5 million at December 31, 2011 and 2010, respectively.

There are no plan assets expected to be withdrawn and returned to us in 2012.

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Components of Net Periodic Benefit Cost -The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	20,013		$	19,277		$	20,762
Interest cost		58,757			58,143			58,052
Expected return on assets		(75,500	)		(73,651	)		(66,034	)
Amortization of unrecognized prior service cost		1,018			1,278			1,565
Amortization of net loss		35,708			27,555			17,322
Net periodic benefit cost	$	39,996		$	32,602		$	31,667

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	4,987		$	4,926		$	5,173
Interest cost		15,632			15,643			16,918
Expected return on assets		(10,272	)		(7,896	)		(6,809	)
Amortization of unrecognized net asset at adoption		3,189			3,189			3,189
Amortization of unrecognized prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of net loss		8,123			7,009			9,660
Net periodic benefit cost	$	19,141		$	20,868		$	26,128

Other Comprehensive Income (Loss) - The following tables set forth the amounts recognized in other comprehensive income (loss) related to our pension benefits and postretirement benefits for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	114,625		$	19,146		$	(4,674	)
Net loss arising during the period		(182,987	)		(43,055	)		(30,340	)
Amortization of regulatory asset		(23,265	)		(18,359	)		(11,465	)
Amortization of prior service credit		1,018			1,278			1,565
Amortization of loss		35,708			27,555			17,322
Deferred income taxes		21,236			5,197			10,674
Total recognized in other comprehensive income (loss)	$	(33,665	)	$	(8,238	)	$	(16,918	)

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	7,389		$	8,408		$	(19,292	)
Net gain (loss) arising during the period		(40,765	)		(15,980	)		21,692
Amortization of regulatory asset		(7,214	)		(6,759	)		(9,400	)
Amortization of transition obligation		3,189			3,189			3,189
Amortization of prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of loss		8,123			7,009			9,660
Plan amendment		44,562			-			-
Deferred income taxes		(4,938	)		2,373			(1,488	)
Total recognized in other comprehensive income (loss)	$	7,828		$	(3,763	)	$	2,358

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The table below sets forth the amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Pension Benefits						Postretirement Benefits
	December 31,						December 31,
	2011			2010			2011			2010
	(Thousands of dollars)
Transition obligation	$	-		$	-		$	(3,157	)	$	(6,346	)
Prior service credit (cost)		(2,991	)		(4,009	)		46,426			4,377
Accumulated gain (loss)		(630,886	)		(483,607	)		(123,489	)		(90,846	)
Accumulated other comprehensive income (loss)      before regulatory assets		(633,877	)		(487,616	)		(80,220	)		(92,815	)
Regulatory asset for regulated entities		407,886			316,527			58,752			58,577
Accumulated other comprehensive income (loss)      after regulatory assets		(225,991	)		(171,089	)		(21,468	)		(34,238	)
Deferred income taxes		87,413			66,180			8,305			13,243
Accumulated other comprehensive income (loss),      net of tax	$	(138,578	)	$	(104,909	)	$	(13,163	)	$	(20,995	)

The following table sets forth the amounts recognized in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense in the next fiscal year:

	Pension		Postretirement
	Benefits		Benefits
Amounts to be recognized in 2012	(Thousands of dollars)
Transition obligation	$	-	$	2,874
Prior service credit (cost)	$	969	$	(8,252	)
Net loss	$	48,439	$	13,184

Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postretirement benefits for the periods indicated:

	Years Ended
	December 31,
	2011	2010
Discount rate	5.00%	5.50%
Compensation increase rate	3.2% - 3.8%	3.3% - 3.9%

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended
	December 31,
	2011	2010		2009
Discount rate	5.50%		6.00%		6.25%
Expected long-term return on plan assets	8.25%		8.50%		8.50%
Compensation increase rate	3.30% - 3.90%		3.1% - 4.0%		4.3% - 4.8%

We determine our overall expected long-term rate of return on plan assets, based on our review of historical returns and economic growth models.

We determine our discount rates annually.  We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our pension and postretirement obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows.  Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds.  Bonds selected to be included in the portfolios are only those rated by Moody’s as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

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Health Care Cost Trend Rates -The following table sets forth the assumed health care cost trend rates for the periods indicated:

	2011		2010
Health care cost-trend rate assumed for next year		4.0% - 9.0%		6.0% - 9.0%
Rate to which the cost-trend rate is assumed
to decline (the ultimate trend rate)		4.0% - 5.0%		5.0%
Year that the rate reaches the ultimate trend rate		2021		2020

Assumed health care cost trend rates have a significant effect on the amounts reported for our health care plans.  A one percentage point change in assumed health care cost trend rates would have the following effects:

	One Percentage		One Percentage
	Point Increase		Point Decrease
	(Thousands of dollars)
Effect on total of service and interest cost	$	1,833	$	(1,559	)
Effect on postretirement benefit obligation	$	17,562	$	(16,079	)

Plan Assets -Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals.  The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations.  The plan’s investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, insurance contracts and venture capital.  The target allocation for the assets of our pension plan is as follows:

U.S. large-cap equities	37%
Aggregate bonds	24%
Developed foreign large-cap equities	10%
Alternative investments	8%
Mid-cap equities	6%
Emerging markets equities	5%
Small-cap equities	4%
High yield bonds	3%
Developed foreign bonds	2%
Emerging market bonds	1%
Total	100%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.  All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock.

The following tables set forth our pension benefits and postretirement benefits plan assets by category as of the measurement date:

	Pension Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	481,971	$	32,475	$	-	$	514,446
Government obligations		-		96,341		-		96,341
Corporate obligations (b)		18,835		58,977		-		77,812
Cash and money market funds (c)		76,575		-		-		76,575
Insurance contracts and group annuity contracts		-		-		70,818		70,818
Other investments (d)		-		-		66,243		66,243
Total assets	$	577,381	$	187,793	$	137,061	$	902,235
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

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	Pension Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	588,224	$	-	$	-	$	588,224
Government obligations		-		80,233		-		80,233
Corporate obligations (b)		26,439		49,199		-		75,638
Cash and money market funds (c)		86,734		-		-		86,734
Insurance contracts and group annuity contracts		-		-		72,198		72,198
Other investments (d)		-		-		1,062		1,062
Total assets	$	701,397	$	129,432	$	73,260	$	904,089
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	21,915	$	113	$	-	$	22,028
Government obligations		-		334		-		334
Corporate obligations (b)		12,156		205		-		12,361
Cash and money market funds (c)		12,477		-		-		12,477
Insurance contracts and group annuity contracts		-		76,733		-		76,733
Other investments (d)		-		-		230		230
Total assets	$	46,548	$	77,385	$	230	$	124,163
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,261	$	-	$	-	$	17,261
Corporate obligations (b)		12,149		-		-		12,149
Cash and money market funds (c)		12,614		-		-		12,614
Insurance contracts and group annuity contracts		-		75,561		-		75,561
Total assets	$	42,024	$	75,561	$	-	$	117,585
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents mutual funds that invest in bonds from diverse industries.
(c) - This category represents an insurance contract with underlying investments that are primarily  directed by us which include equity securities and bonds from diverse industries.

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The following tables set forth the reconciliation of Level 3 fair value measurements of our pension plan for the periods indicated:

	Pension Benefits
	December 31, 2011
	Insurance Contracts			Other Investments		Total
	(Thousands of dollars)
January 1, 2011	$	72,198		$	1,062	$	73,260
Purchases		-			65,000		65,000
Actual return on plan assets
held at the reporting date		(1,380	)		181		(1,199	)
December 31, 2011	$	70,818		$	66,243	$	137,061

	Pension Benefits
	December 31, 2010
	Insurance Contracts			Other Investments			Total
	(Thousands of dollars)
January 1, 2010	$	76,079		$	1,098		$	77,177
Actual return on plan assets
held at the reporting date		(3,881	)		(36	)		(3,917	)
December 31, 2010	$	72,198		$	1,062		$	73,260

Contributions -During 2011, we made contributions of $62.6 million and $11.5 million to our defined benefit pension plans and postretirement benefit plans, respectively.  The contributions to our defined benefit pension plan were attributable to the 2012 plan year.  During the first quarter of 2012, we made a contribution of $60.0 million to our defined benefit pension plan; we do not anticipate that we will be required to make additional material defined benefit pension plan contributions attributable to the 2013 plan year in 2012.  We anticipate our additional 2012 contributions will include $10.7 million for our postretirement benefit plans.

Pension and Postretirement Benefit Payments - Benefit payments for our pension and postretirement benefit plans for the period ending December 31, 2011, were $53.7 million and $17.9 million, respectively.  The following table sets forth the pension benefits and postretirement benefit payments expected to be paid in 2012-2021:

	Pension Benefits		Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2012	$	62,378	$	16,376
2013	$	64,672	$	17,023
2014	$	66,383	$	17,696
2015	$	68,726	$	18,006
2016	$	70,722	$	19,203
2017 through 2021	$	391,808	$	114,039

The expected benefits to be paid are based on the same assumptions used to measure our benefit obligation at December 31, 2011, and include estimated future employee service.

Other Employee Benefit Plans

Thrift Plan - We have a Thrift Plan covering all full-time employees, and employee contributions are discretionary.  We match 100 percent of employee contributions up to 6 percent of each participant’s eligible compensation, subject to certain limits.  Our contributions made to the plan were $15.9 million, $15.4 million and $14.7 million in 2011, 2010 and 2009, respectively.

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Profit-Sharing Plan - We have a profit-sharing plan for all nonbargaining unit employees hired after December 31, 2004, and employees covered by the IBEW collective bargaining agreement hired after June 30, 2010.  Nonbargaining unit employees who were employed prior to January 1, 2005, and employees covered by the IBEW collective bargaining agreement employed prior to July 1, 2010, were given a one-time opportunity to make an irrevocable election to participate in the profit-sharing plan and not accrue any additional benefits under our defined-benefit pension plan after December 31, 2004 and June 30, 2010, respectively.  Employees covered by the United Steelworker collective bargaining agreement employed prior to December 16, 2011, were given a one-time opportunity to make an irrevocable election to participate in the profit-sharing plan.  We plan to make a contribution to the profit-sharing plan each quarter equal to 1 percent of each participant’s eligible compensation during the quarter.  Additional discretionary employer contributions may be made at the end of each year.  Employee contributions are not allowed under the plan.  Our contributions made to the plan were $6.7 million, $4.7 million and $4.7 million in 2011, 2010 and 2009, respectively.

Employee Deferred Compensation Plan -The ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan provides select employees, as approved by our Board of Directors, with the option to defer portions of their compensation and provides nonqualified deferred compensation benefits that are not available due to limitations on employer and employee contributions to qualified defined contribution plans under the federal tax laws.  Our contributions made to the plan were not material in 2011, 2010 and 2009.

N.           INCOME TAXES

The following table sets forth our provisions for income taxes for the periods indicated:

	Years Ended December 31,
	2011				2010		2009
Current income taxes	(Thousands of dollars)
Federal	$	(32,291	)		$	58,844	$	2,664
State		1,707				12,629		1,604
Total current income taxes from continuing operations		(30,584	)	(a)		71,473		4,268
Deferred income taxes
Federal		228,257				124,126		170,100
State		28,375				18,121		28,640
Total deferred income taxes from continuing operations		256,632		(a)		142,247		198,740
Total provision for income taxes from continuing operations		226,048				213,720		203,008
Discontinued operations		1,255				114		4,313
Total provision for income taxes	$	227,303			$	213,834	$	207,321
(a) Includes a $37.7 million reclassification from current income taxes to deferred related to revisions of estimated depreciation in our filed tax returns compared with our 2010 tax provision.

The following table is a reconciliation of our income tax provision from continuing operations for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Income from continuing operations before income taxes	$	983,562		$	753,778		$	686,665
Less: Net income attributable to noncontrolling interest		399,150			206,698			185,753
Income from continuing operations attributable to ONEOK    before income taxes		584,412			547,080			500,912
Federal statutory income tax rate		35	%		35	%		35	%
Provision for federal income taxes		204,543			191,478			175,319
State income taxes, net of federal tax benefit		20,334			19,946			19,625
Other, net		1,171			2,296			8,064
Income tax provision from continuing operations	$	226,048		$	213,720		$	203,008

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The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated.

	December 31,		December 31,
	2011		2010
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	136,997	$	89,480
Other comprehensive income		134,037		73,515
Other		31,544		25,694
Total deferred tax assets		302,578		188,689
Deferred tax liabilities
Excess of tax over book depreciation and depletion		664,415		519,627
Investment in partnerships		851,408		729,682
Regulatory assets		200,010		157,756
Total deferred tax liabilities		1,715,833		1,407,065
Net deferred tax liabilities before discontinued operations		1,413,255		1,218,376
Discontinued operations		82		26
Net deferred tax liabilities	$	1,413,337	$	1,218,402

We had income taxes receivable of approximately $10.7 million and $45.7 million at December 31, 2011 and 2010, respectively.

O.           UNCONSOLIDATED AFFILIATES

Northern Border Pipeline - The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline’s partners are to be made on a pro rata basis according to each partner’s percentage interest.  The Northern Border Pipeline Management Committee determines the amount and timing of such distributions.  Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee.  Cash distributions are equal to 100 percent of distributable cash flow as determined from Northern Border Pipeline’s financial statements based upon EBITDA less interest expense and maintenance capital expenditures.  Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement.  The Northern Border Pipeline Management Committee has adopted a cash distribution policy related to financial ratio targets and capital contributions.  The cash distribution policy defines minimum equity-to- total-capitalization ratios to be used by the Northern Border Pipeline Management Committee to establish the timing and amount of required capital contributions.  In addition, any shortfall due to the inability to refinance maturing debt will be funded by capital contributions.

During 2011, ONEOK Partners made equity contributions to Northern Border Pipeline Company totaling approximately $54.8 million.

Overland Pass Pipeline Company - In September 2010, ONEOK Partners completed a transaction to sell a 49-percent ownership interest in Overland Pass Pipeline Company to a subsidiary of Williams Partners, resulting in each joint-venture member now owning 50 percent of Overland Pass Pipeline Company.  In accordance with the joint-venture agreement, ONEOK Partners received approximately $423.7 million in cash at closing.  As a result of the transaction, ONEOK Partners no longer controls Overland Pass Pipeline Company and began accounting for the investment under the equity method of accounting in September 2010.  In connection with the deconsolidation of Overland Pass Pipeline Company, ONEOK Partners recognized approximately $16.3 million in gain on sale of assets, primarily attributable to the remeasurement of its retained investment in Overland Pass Pipeline Company to its fair value, and has recorded its retained investment of approximately $438 million in investments in unconsolidated affiliates.  The estimate of the fair value of ONEOK Partners’ retained interest in Overland Pass Pipeline Company was based upon the income and market valuation approaches.

The Overland Pass Pipeline Company limited liability company agreement provides that distributions to Overland Pass Pipeline Company’s members are to be made on a pro rata basis according to each member’s percentage interest.  The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions.  Any changes to, or suspensions of, cash distributions from Overland Pass Pipeline Company requires the unanimous approval of the Overland Pass Pipeline Management Committee.  Cash distributions are equal to 100 percent of available cash as defined in the limited liability company agreement.

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Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest
			December 31,		December 31,
			2011		2010
			(Thousands of dollars)
Northern Border Pipeline	50%	$	416,206	$	384,011
Overland Pass Pipeline Company	50%		447,449		443,392
Fort Union Gas Gathering, L.L.C.	37%		117,353		115,148
Bighorn Gas Gathering, L.L.C.	49%		91,748		92,659
Other	Various		150,642		152,914
Investments in unconsolidated affiliates (a)		$	1,223,398	$	1,188,124
(a) - Equity method goodwill (Note A) was $185.6 million at December 31, 2011 and 2010.

Equity Earnings from Investments -The following table sets forth our equity earnings from investments for the periods indicated.  All amounts in the table below are equity earnings from investments in our ONEOK Partners segment:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Northern Border Pipeline	$	76,365	$	68,124	$	41,300
Overland Pass Pipeline Company (a)		19,535		5,421		-
Fort Union Gas Gathering, L.L.C.		15,280		14,367		14,533
Bighorn Gas Gathering, L.L.C.		5,990		5,495		7,807
Other		10,076		8,473		9,082
Equity earnings from investments	$	127,246	$	101,880	$	72,722
(a) - Beginning in September 2010, following the sale of a 49-percent interest, Overland Pass Pipeline Company was deconsolidated and prospectively accounted for under the equity method.

Unconsolidated Affiliates Financial Information - The following tables set forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Balance Sheet
Current assets	$	133,579		$	93,698
Property, plant and equipment, net	$	2,451,798		$	2,500,708
Other noncurrent assets	$	35,548		$	28,222
Current liabilities	$	76,355		$	74,969
Long-term debt	$	534,485		$	616,210
Other noncurrent liabilities	$	15,510		$	13,773
Accumulated other comprehensive income (loss)	$	(2,700	)	$	(2,883	)
Owners' equity	$	1,997,275		$	1,920,559

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Income Statement (a)
Operating revenues	$	496,158	$	440,826	$	383,625
Operating expenses	$	221,261	$	189,437	$	178,194
Net income	$	249,559	$	223,715	$	164,002
Distributions paid to us	$	156,385	$	114,805	$	109,807
(a) - Financial information for 2011 is not directly comparable with 2010 and 2009 due to the deconsolidation of Overland Pass Pipeline Company in September 2010.

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P.           ONEOK PARTNERS

Unit Split - In July 2011, ONEOK Partners completed a two-for-one split of its common and Class B units, and its Partnership Agreement was amended to adjust the formula for distributing available cash among its general partner and limited partners to reflect the unit split.  As a result, all unit and per-unit amounts contained herein have been adjusted to be presented on a post-split basis.

Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below as of December 31, 2011 and 2010:

General partner interest	2.0%
Limited partner interest (a)	40.8%
Total ownership interest	42.8%
(a) - Represents 11.8 million common units and approximately 73.0 million Class B units, which are convertible, at our option, into common units.

In February 2010, ONEOK Partners completed an underwritten public offering of 11,001,800 common units, including the partial exercise by the underwriters of their over-allotment option, at a public offering price of $30.38 per common unit, generating net proceeds of approximately $322.7 million.  In conjunction with the offering, ONEOK Partners GP contributed $6.8 million in order to maintain its 2-percent general partner interest.  ONEOK Partners used the proceeds from the sale of common units and the general partner contribution to repay borrowings under the ONEOK Partners Credit Agreement and for general partnership purposes. 

We account for the difference between the carrying amount of our investment in ONEOK Partners and the underlying book value arising from issuance of common units by ONEOK Partners as an equity transaction.  If ONEOK Partners issues common units at a price different than our carrying value per unit, we account for the premium or deficiency as an adjustment to paid-in capital.  As a result of ONEOK Partners’ issuance of common units at a premium to our carrying value per unit, we recognized an increase to paid-in capital of $50.7 million for the year ended December 31, 2010.

Cash Distributions - We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights.  Under ONEOK Partners’ partnership agreement, as amended, distributions are made to the partners with respect to each calendar quarter in an amount equal to 100 percent of available cash as defined in ONEOK Partners’ partnership agreement, as amended.  Available cash generally will be distributed 98 percent to limited partners and 2 percent to the general partner.  The general partner’s percentage interest in quarterly distributions is increased after certain specified target levels are met during the quarter.  In July 2011, the partnership agreement was amended to adjust the formula for distributing available cash among the general partner and limited partners to reflect the two-for-one unit split.  Under the incentive distribution provisions, as set forth in ONEOK Partners’ partnership agreement, as amended, the general partner receives:

·   15 percent of amounts distributed in excess of $0.3025 per unit;

·   25 percent of amounts distributed in excess of $0.3575 per unit; and

·   50 percent of amounts distributed in excess of $0.4675 per unit.

The following table shows ONEOK Partners’ distributions paid in the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.325	$	2.230	$	2.165
General partner distributions	$	12,189	$	11,264	$	10,005
Incentive distributions		123,386		103,463		84,657
Distributions to general partner		135,575		114,727		94,662
Limited partner distributions to ONEOK		197,133		189,078		183,567
Limited partner distributions to noncontrolling interest		276,738		259,380		222,024
Total distributions paid	$	609,446	$	563,185	$	500,253

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The following table shows ONEOK Partners’ distributions declared for the periods indicated and paid within 45 days of the end of the period:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.365	$	2.250	$	2.175
General partner distributions	$	12,515	$	11,578	$	10,228
Incentive distributions		131,213		108,711		87,734
Distributions to general partner		143,728		120,289		97,962
Limited partner distributions to ONEOK		200,524		190,774		184,415
Limited partner distributions to noncontrolling interest		281,499		267,811		229,030
Total distributions declared	$	625,751	$	578,874	$	511,407

Relationship - We consolidate ONEOK Partners in our consolidated financial statements; however, we are restricted from the assets and cash flows of ONEOK Partners except for the distributions we receive.  Distributions are declared quarterly by ONEOK Partners’ general partner based on the terms of the ONEOK Partners partnership agreement.  See Note R for more information on ONEOK Partners’ results.

Affiliate Transactions - We have certain transactions with ONEOK Partners and its subsidiaries, which comprise our ONEOK Partners segment.

ONEOK Partners sells natural gas from its natural gas gathering and processing operations to our Energy Services segment.  In addition, a portion of ONEOK Partners’ revenues from its natural gas pipelines business is from our Energy Services and Natural Gas Distribution segments, which contract with ONEOK Partners for natural gas transportation and storage services.  ONEOK Partners also purchases natural gas from our Energy Services segment for its natural gas liquids and its natural gas gathering and processing operations.

Previously, ONEOK Partners had a Processing and Services Agreement with us and OBPI, under which it contracted for all of OBPI’s rights, including all of the capacity of the Bushton Plant, reimbursing OBPI for all costs associated with the operation and maintenance of the Bushton Plant and its obligations under equipment leases covering portions of the Bushton Plant.  In April 2011, pursuant to its rights under the Processing and Services Agreement, ONEOK Partners directed OBPI to give notice of intent to exercise the purchase option for the leased equipment pursuant to the terms of the equipment leases.  On June 30, 2011, through a series of transactions, we sold OBPI to ONEOK Partners and OBPI closed the purchase option and terminated the equipment leases.  The total amount paid by ONEOK Partners to complete the transactions was approximately $94.2 million, which included the reimbursement to us of obligations related to the Processing and Services Agreement.

We provide a variety of services to our affiliates, including cash management and financial services, legal and administrative services by our employees and management, insurance and office space leased in our headquarters building and other field locations.  Where costs are incurred specifically on behalf of an affiliate, the costs are billed directly to the affiliate by us.  In other situations, the costs may be allocated to the affiliates through a variety of methods, depending upon the nature of the expenses and the activities of the affiliates.  For example, a service that applies equally to all employees is allocated based upon the number of employees in each affiliate.  However, an expense benefiting the consolidated company but having no direct basis for allocation is allocated by the modified Distrigas method, a method using a combination of ratios that include gross plant and investment, operating income and payroll expense.  It is not practicable to determine what these general overhead costs would be on a stand-alone basis.

The following table shows ONEOK Partners’ transactions with us for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Revenues	$	403,603	$	457,740	$	475,765
Expenses
Cost of sales and fuel	$	48,163	$	53,107	$	46,824
Administrative and general expenses		251,239		207,282		200,002
Total expenses	$	299,402	$	260,389	$	246,826

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Q.           COMMITMENTS AND CONTINGENCIES

Commitments - Operating leases represent future minimum lease payments under noncancelable equipment leases covering office space, pipeline equipment, rights of way and vehicles.  Firm transportation and storage contracts are fixed-price contracts that provide us with firm transportation and storage capacity.  Rental expense in 2011, 2010 and 2009 was not material.  The following table sets forth our operating lease and firm transportation and storage contract payments for the periods indicated:

ONEOK		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	1.2		$	122.4	$	123.6
2013		0.9			87.5		88.4
2014		0.6			68.2		68.8
2015		0.3			42.9		43.2
2016		-			26.4		26.4
Thereafter		-			23.2		23.2
Total	$	3.0		$	370.6	$	373.6

ONEOK Partners		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	3.4		$	9.0	$	12.4
2013		2.8			6.5		9.3
2014		2.8			6.2		9.0
2015		1.3			6.1		7.4
2016		1.0			4.7		5.7
Thereafter		6.4			5.7		12.1
Total	$	17.7		$	38.2	$	55.9

Environmental Liabilities - We are subject to multiple historical and wildlife preservation laws and environmental regulations affecting many aspects of our present and future operations.  Regulated activities include those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, hazardous materials transportation, and pipeline and facility construction.  These laws and regulations require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals.  Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations.  If a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including response, investigation and cleanup costs, which could affect materially our results of operations and cash flows.  In addition, emission controls required under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We own or retain legal responsibility for the environmental conditions at 12 former manufactured natural gas sites in Kansas.  These sites contain potentially harmful materials that are subject to control or remediation under various environmental laws and regulations.  A consent agreement with the KDHE presently governs all work at these sites.  The terms of the consent agreement allow us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis.  Remediation typically involves the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater.

Of the 12 sites, we have begun soil remediation on 11 sites.  Regulatory closure has been achieved at three locations, and we have completed or are near completion of soil remediation at eight sites.  We have begun site assessment at the remaining site where no active remediation has occurred.

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Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during 2011, 2010 or 2009.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria.  Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions.  The rule was phased in beginning January 2011, and at current emission threshold levels, we believe it will have a minimal impact on our existing facilities.  The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities; however, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA has issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, with a compliance date in 2013.  The rule will require capital expenditures over the next two years for the purchase and installation of new emissions-control equipment.  We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

On July 28, 2011, the EPA issued a proposed rule package that would change the air emission New Source Performance Standards and Maximum Achievable Control Technology requirements applicable to natural gas production, processing, transmission and underground storage.  The proposed rules would impact emission limits for specific equipment through the use of controls; however, potential costs associated with the proposed rules are currently unknown.

Pipeline Safety - We are subject to Pipeline and Hazardous Materials Safety Administration regulations, including integrity- management regulations.  The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas.  In January 2012, The Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011 was signed into law.  The new law increased the maximum penalties for violating federal pipeline safety regulations and directs the Department of Transportation and Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us.  These issues include but are not limited to:

·   an evaluation of whether natural gas liquid and natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;

·   a review of all natural gas and hazardous natural gas liquid gathering pipeline exemptions;

·   a verification of records for pipelines in class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and

·   a requirement to test pipelines previously untested in high-consequence areas operating above 30 percent yield strength.

The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.

Financial Markets Legislation - The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets.  Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act.  Although the CFTC has issued final regulations for certain provisions of the Dodd-Frank Act, many remain outstanding.  In November 2011, the CFTC published final rules on speculative position limits, which we do not expect to impact directly our current risk-management practices.  In December 2011, the CFTC issued an order that further defers the effective date of the provisions of the Dodd-Frank Act that require a rulemaking, such as definitions of certain terms, until the earlier of the effective date of the final rule defining the reference terms or July 16, 2012.  Until the remaining final regulations are established, we are unable to ascertain how we may be affected by them.  Based on our assessment of the regulations issued to date and those proposed, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation.  We also may incur additional costs associated with our compliance with the new regulations and anticipated additional record keeping, reporting and disclosure obligations; however, we do not believe the costs will be material.  These requirements could affect adversely market liquidity and pricing of derivative contracts making it more difficult to execute our risk-management strategies in the future.  Also, the anticipated increased costs of compliance by dealers and counterparties likely will be passed on to customers, which could decrease the benefits of hedging to us and could reduce our profitability and liquidity.

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Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations.  While the results of litigation and claims cannot be predicted with certainty, and we are unable to estimate reasonably possible losses, we believe the probable final outcome of such matters will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

R.           SEGMENTS

Segment Descriptions - Our operations are divided into three reportable business segments as follows:  (i) our ONEOK Partners segment reflects the consolidated operations of ONEOK Partners.  We own a 42.8-percent ownership interest and control ONEOK Partners through our ownership of its general partner interest.  ONEOK Partners gathers, processes, treats, transports, stores and sells natural gas and gathers, treats, fractionates, stores, distributes and markets NGLs.  We and ONEOK Partners maintain significant financial and corporate governance separations.  We seek to receive increasing cash distributions as a result of our investment in ONEOK Partners, and our investment decisions are made based on the anticipated returns from ONEOK Partners in total, not specific to any of its businesses individually; (ii) our Natural Gas Distribution segment is comprised of our regulated public utilities that deliver natural gas to residential, commercial and industrial customers, and transport natural gas; and (iii) our Energy Services segment markets natural gas to wholesale customers.  Other and eliminations consist of the operating and leasing operations of our headquarters building and related parking facility and other amounts needed to reconcile our reportable segments to our consolidated financial statements.

Accounting Policies - The accounting policies of the segments are the same as those described in Note A.  Intersegment sales are recorded on the same basis as sales to unaffiliated customers and are discussed in further detail in Note P.  Net margin is comprised of total revenues less cost of sales and fuel.  Cost of sales and fuel includes commodity purchases, fuel, and storage and transportation costs.

Customers - In 2011, 2010 and 2009, we had no single external customer from which we received 10 percent or more of our consolidated gross revenues.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2011	ONEOK Partners (a)			Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	10,919,004		$	1,609,628	$	2,274,799	$	2,363		$	14,805,794
Intersegment revenues		403,603			11,706		502,418		(917,727	)		-
Total revenues	$	11,322,607		$	1,621,334	$	2,777,217	$	(915,364	)	$	14,805,794
Net margin	$	1,577,380		$	751,835	$	48,740	$	2,404		$	2,380,359
Operating costs		459,364			422,073		24,527		2,359			908,323
Depreciation and amortization		177,549			132,212		445		1,954			312,160
Gain (loss) on sale of assets		(963	)		-		-		-			(963	)
Operating income	$	939,504		$	197,550	$	23,768	$	(1,909	)	$	1,158,913
Equity earnings from investments	$	127,246		$	-	$	-	$	-		$	127,246
Investments in unconsolidated    affiliates	$	1,223,398		$	-	$	-	$	-		$	1,223,398
Total assets	$	8,946,676		$	3,392,475	$	562,728	$	794,756		$	13,696,635
Noncontrolling interests in    consolidated subsidiaries	$	5,112		$	-	$	-	$	1,556,047		$	1,561,159
Capital expenditures	$	1,063,383		$	242,590	$	41	$	30,053		$	1,336,067
(a) - Our ONEOK Partners segment has regulated and nonregulated operations. Our ONEOK Partners segment’s regulated operations had revenues of $658.5 million, net margin of $469.0 million and operating income of $232.8 million.

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Year Ended December 31, 2010	ONEOK Partners (a)		Natural Gas Distribution			Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	8,218,160	$	1,810,502		$	2,647,460	$	2,669		$	12,678,791
Intersegment revenues		457,740		6,900			653,717		(1,118,357	)		-
Total revenues	$	8,675,900	$	1,817,402		$	3,301,177	$	(1,115,688	)	$	12,678,791
Net margin	$	1,144,853	$	754,917		$	159,739	$	2,661		$	2,062,170
Operating costs		403,476		398,861			28,384		192			830,913
Depreciation and amortization		173,708		130,968			694		1,854			307,224
Gain (loss) on sale of assets		18,632		(13	)		-		-			18,619
Operating income	$	586,301	$	225,075		$	130,661	$	615		$	942,652
Equity earnings from investments	$	101,880	$	-		$	-	$	-		$	101,880
Investments in unconsolidated    affiliates	$	1,188,124	$	-		$	-	$	-		$	1,188,124
Total assets	$	7,920,100	$	3,237,890		$	651,960	$	689,225		$	12,499,175
Noncontrolling interests in    consolidated subsidiaries	$	5,176	$	-		$	-	$	1,467,042		$	1,472,218
Capital expenditures	$	352,714	$	215,608		$	488	$	13,938		$	582,748
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment’s regulated operations had revenues of $612.2 million, net margin of $479.1 million and operating income of $250.9 million.

Year Ended December 31, 2009	ONEOK Partners (a)		Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	5,998,726	$	1,832,146	$	2,971,902	$	2,979		$	10,805,753
Intersegment revenues		475,765		6,745		581,740		(1,064,250	)		-
Total revenues	$	6,474,491	$	1,838,891	$	3,553,642	$	(1,061,271	)	$	10,805,753
Net margin	$	1,119,297	$	716,028	$	159,647	$	2,979		$	1,997,951
Operating costs		411,227		384,126		35,542		65			830,960
Depreciation and amortization		164,136		122,594		540		1,653			288,923
Gain (loss) on sale of assets		2,668		486		-		1,652			4,806
Operating income	$	546,602	$	209,794	$	123,565	$	2,913		$	882,874
Equity earnings from investments	$	72,722	$	-	$	-	$	-		$	72,722
Investments in unconsolidated    affiliates	$	765,163	$	-	$	-	$	-		$	765,163
Total assets	$	7,953,259	$	3,120,704	$	930,086	$	823,634		$	12,827,683
Noncontrolling interests in    consolidated subsidiaries	$	5,603	$	-	$	-	$	1,232,665		$	1,238,268
Capital expenditures	$	615,691	$	157,508	$	105	$	17,941		$	791,245
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment’s regulated operations had revenues of $555.9 million, net margin of $451.0 million and operating income of $200.3 million.

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S.           QUARTERLY FINANCIAL DATA (UNAUDITED)

	First		Second		Third			Fourth
Year Ended December 31, 2011	Quarter		Quarter		Quarter			Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,760,600	$	3,444,798	$	3,529,359		$	4,071,037
Net margin (a)	$	629,877	$	518,833	$	532,624		$	699,025
Income from continuing operations (a)	$	198,285	$	134,330	$	161,158		$	263,741
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,061	$	437	$	(278	)	$	1,010
Net income	$	199,346	$	134,767	$	160,880		$	264,751
Net income attributable to ONEOK	$	130,130	$	55,142	$	60,321		$	115,001
Earnings per share total
Basic	$	1.22	$	0.52	$	0.58		$	1.12
Diluted	$	1.19	$	0.51	$	0.57		$	1.09

	First		Second		Third		Fourth
Year Ended December 31, 2010	Quarter		Quarter		Quarter		Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,780,203	$	2,740,689	$	2,877,849	$	3,280,050
Net margin (a)	$	615,099	$	455,558	$	449,504	$	542,009
Income from continuing operations (a)	$	185,232	$	86,146	$	120,005	$	148,675
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,488	$	228	$	296	$	(740	)
Net income	$	186,720	$	86,374	$	120,301	$	147,935
Net income attributable to ONEOK	$	154,539	$	41,724	$	55,295	$	83,074
Earnings per share total
Basic	$	1.46	$	0.39	$	0.52	$	0.78
Diluted	$	1.44	$	0.39	$	0.51	$	0.76
(a) These amounts vary from the amounts previously filed due to the sale of ONEOK Energy Marketing Company
in February 2012. See Note B for additional information on our discontinued operations.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A.   CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rule 13a-15(b) of the Exchange Act.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f).  Under the supervision and with the participation of our management, including our Principal Executive Officer and Principal Financial Officer, we evaluated the effectiveness of our internal control over financial reporting based on the framework in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.  Because of inherent limitations, internal control over financial reporting may not prevent or detect misstatements.  Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.  Based on our evaluation under that framework and applicable SEC rules, our management concluded that our internal control over financial reporting was effective as of December 31, 2011.

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Our internal control over financial reporting as of December 31, 2011, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein (Item 8).

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting during the quarter ended December 31, 2011, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B.   OTHER INFORMATION

Not applicable.

PART III.

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors of the Registrant

Information concerning our directors is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Executive Officers of the Registrant

Information concerning our executive officers is included in Part I, Item 1, Business, of this Annual Report.

Compliance with Section 16(a) of the Exchange Act

Information on compliance with Section 16(a) of the Exchange Act is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Code of Ethics

Information concerning the code of ethics, or code of business conduct, is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Nominating Committee Procedures

Information concerning the Nominating Committee procedures is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Audit Committee

Information concerning the Audit Committee is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Audit Committee Financial Experts

Information concerning the Audit Committee Financial Experts is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 11. EXECUTIVE COMPENSATION

Information on executive compensation is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

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ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Security Ownership of Certain Beneficial Owners

Information concerning the ownership of certain beneficial owners is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Security Ownership of Management

Information on security ownership of directors and officers is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

Equity Compensation Plan Information

The following table sets forth certain information concerning our equity compensation plans as of December 31, 2011:

							Number of Securities
							Remaining Available For
		Number of Securities		Weighted-Average			Future Issuance Under
		to be Issued Upon		Exercise Price of			Equity Compensation
		Exercise of Outstanding		Outstanding Options,			Plans (Excluding
		Options, Warrants and Rights		Warrants and Rights			Securities in Column (a))
Plan Category		(a)		(b)			(c)
Equity compensation plans
approved by security holders (1)			2,487,877		$44.24			3,393,142
Equity compensation plans
not approved by security holders (2)			233,502		$83.14	(3)		503,602
Total			2,721,379		$47.57			3,896,744
(1) -	Includes shares granted under our Employee Stock Purchase Plan, and Employee Stock Award Program, and stock options, restricted stock incentive units and performance unit awards granted under our Long-Term Incentive Plan and Equity Compensation Plan.  For a brief description of the material features of these plans, see Note K of the Notes to Consolidated Financial Statements in this Annual Report.  Column (c) includes 389,237, 2,978, 840,691 and 2,160,236 shares available for future issuance under our Employee Stock Purchase Plan, Employee Stock Award Program, Long-Term Incentive Plan and Equity Compensation Plan, respectively.
(2) -	Includes our Employee Non-Qualified Deferred Compensation Plan, Deferred Compensation Plan for Non-Employee Directors and Stock Compensation Plan for Non-Employee Directors.  For a brief description of the material features of these plans, see Note L of the Notes to Consolidated Financial Statements in this Annual Report.
(3) -	Compensation deferred into our common stock under our Employee Non-Qualified Deferred Compensation Plan and Deferred Compensation Plan for Non-Employee Directors is distributed to participants at fair market value on the date of distribution.  The price used for these plans to calculate the weighted-average exercise price in the table is $86.09, which represents the year-end closing price of our common stock on the NYSE.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Information on certain relationships and related transactions and director independence is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

Information concerning the principal accountant’s fees and services is set forth in our 2012 definitive Proxy Statement and is incorporated herein by this reference.

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PART IV.

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(1)     Financial Statements Page No.

(a)	Report of Independent Registered Public Accounting Firm	73
(b)	Consolidated Statements of Income for the years ended	74
	December 31, 2011, 2010 and 2009
(c)	Consolidated Statements of Comprehensive Income for the years	75
	ended December 31, 2011, 2010 and 2009
(d)	Consolidated Balance Sheets as of December 31, 2011 and 2010	76-77
(e)	Consolidated Statements of Cash Flows for the years ended	79
	December 31, 2011, 2010 and 2009
(f)	Statements of Shareholders’ Equity for the years	80-81
	ended December 31, 2011, 2010 and 2009
(g)	Notes to Consolidated Financial Statements	82-123

(2)  Financial Statement Schedules

All schedules have been omitted because of the absence of conditions under which they are required.

(3)  Exhibits

3 Not used.

3.1 Not used.

3.2 Not used.

3.3 Not used.

3.4 Amended and Restated Bylaws of ONEOK, Inc. (incorporated by reference from Exhibit 99.1 to Form 8-K filed January 20, 2009).

3.5 Amended and Restated Certificate of Incorporation of ONEOK, Inc. dated May 15, 2008 (incorporated by reference from Exhibit 3.1 to Form 8-K filed May 19, 2008).

3.6 Certificate of Correction form dated November 5, 2008 (incorporated by reference from Exhibit 4.2 to Registration Statement on Form S-3 filed November 21, 2008).

4 Certificate of Designation for Convertible Preferred Stock of WAI, Inc. (now ONEOK, Inc.) filed November 21, 2008 (incorporated by reference from Exhibit 4.2 to Registration Statement on Form S-3 filed November 21, 2008, Commission File No. 333-155593).

4.1 Certificate of Designation for Series C Participating Preferred Stock of ONEOK, Inc. filed November 21, 2008 (incorporated by reference from Exhibit No. 4.2 to Registration Statement on Form S-3 filed November 21, 2008).

4.2 Form of Common Stock Certificate (incorporated by reference from Exhibit 1 to Registration Statement on Form 8-A filed November 21, 1997).

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4.3 Indenture, dated September 24, 1998, between ONEOK, Inc. and Chase Bank of Texas (incorporated by reference from Exhibit 4.1 to Registration Statement on Form S-3 filed August 26, 1998, Commission File No. 333-62279).

4.4 Indenture dated December 28, 2001, between ONEOK, Inc. and SunTrust Bank (incorporated by reference from Exhibit 4.1 to Amendment No. 1 to Registration Statement on Form S-3 filed December 28, 2001, Commission File No. 333-65392).

4.5 First Supplemental Indenture dated September 24, 1998, between ONEOK, Inc. and Chase Bank of Texas (incorporated by reference from Exhibit 5(a) to Form 8-K/A filed October 2, 1998).

4.6 Second Supplemental Indenture dated September 25, 1998, between ONEOK, Inc. and Chase Bank of Texas (incorporated by reference from Exhibit 5(b) to Form 8-K/A filed October 2, 1998).

4.7 Second Amended and Restated Rights Agreement, dated as of March 31, 2011, between ONEOK, Inc. and Wells Fargo Bank, N.A. as Rights Agent (incorporated by reference from Exhibit 4.1 to the Form 10-Q for the quarter ended March 31, 2011, filed on May 5, 2011).

4.8 Fourth Supplemental Indenture dated February 17, 1999, between ONEOK, Inc. and Chase Bank of Texas (incorporated by reference from Exhibit 4.5 to Registration Statement on Form S-3 filed April 15, 1999, Commission File No. 333-76375).

4.9 Not used.

4.10 Not used.

4.11 Not used.

4.12 Eighth Supplemental Indenture dated April 6, 2001, between ONEOK, Inc. and The Chase Manhattan Bank (incorporated by reference from Exhibit 4.9 to Registration Statement on Form S-3 filed July 19, 2001, Commission File No. 333-65392).

4.13 Not used.

4.14 Second Supplemental Indenture, dated June 17, 2005, between ONEOK, Inc. and SunTrust Bank (incorporated by reference from Exhibit 4.1 to Form 8-K filed June 17, 2005).

4.15 Third Supplemental Indenture, dated June 17, 2005, between ONEOK, Inc. and SunTrust Bank (incorporated by reference from Exhibit 4.3 to Form 8-K filed June 17, 2005).

4.16 Not used.

4.17 Not used.

4.18 Indenture, dated as of March 21, 2001, between Northern Border Partners, L.P. and Northern Border Intermediate Limited Partnership and Bank One Trust Company, N.A., Trustee (incorporated by reference to Exhibit 4.3 to Northern Border Partners, L.P.’s Form 10-K for the year ended December 31, 2001, filed on March 29, 2002 (File No. 1-12202)).

4.19 Indenture, dated as of September 25, 2006, between ONEOK Partners, L.P. and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit 4.1 to ONEOK Partners, L.P.’s Form 8-K filed on September 26, 2006 (File No. 1-12202)).

4.20 First Supplemental Indenture, dated as of September 25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 5.90 percent Senior Notes due 2012 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Form 8-K filed on September 26, 2006 (File No. 1-12202)).

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4.21 Second Supplemental Indenture, dated as of September 25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.15 percent Senior Notes due 2016 (incorporated by reference to Exhibit 4.3 to ONEOK Partners, L.P.’s Form 8-K filed on September 26, 2006 (File No. 1-12202)).

4.22 Third Supplemental Indenture, dated as of September 25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.65 percent Senior Notes due 2036 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Form 8-K filed on September 26, 2006 (File No. 1-12202)).

4.23 Fourth Supplemental Indenture, dated as of September 28, 2007, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.85 percent Senior Notes due 2037 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Form 8-K filed on September 28, 2007 (File No. 1-12202)).

4.24 Fifth Supplemental Indenture, dated as of March 3, 2009, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 8.625 percent Senior Notes due 2019 (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K, filed by ONEOK Partners, L.P. on March 3, 2009 (File No. 1-12202)).

4.25 Not used.

4.26 Form of Class B unit certificate of ONEOK Partners, L.P. (incorporated by reference to Exhibit 4.1 to Northern Border Partners, L.P.’s Form 8-K filed on April 12, 2006 (File No. 1-12202)).

4.27 Sixth Supplemental Indenture, dated January 26, 2011, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 3.250 percent Senior Notes due 2016 (incorporated by reference from Exhibit 4.2 to Form 8-K for the filed January 26, 2011 (File No. 1-12202)).

4.28 Seventh Supplemental Indenture, dated January 26, 2011, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.125 percent Senior Notes due 2041 (incorporated by reference from Exhibit 4.3 to Form 8-K for the filed January 26, 2011 (File No. 1-12202)).

4.29 Indenture, dated as of January 26, 2012, among ONEOK, Inc. and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to Form 8-K filed January 26, 2012).

4.30 First Supplemental Indenture, dated January 26, 2012, among ONEOK, Inc. and U.S. Bank National Association, as trustee, with respect to the 4.25 percent Senior Notes due 2022 (incorporated by reference to Exhibit 4.2 to Form 8-K filed January 26, 2012).

10 ONEOK, Inc. Long-Term Incentive Plan (incorporated by reference from Exhibit 10(a) to Form 10-K for the fiscal year ended December 31, 2001, filed March 14, 2002).

10.1 ONEOK, Inc. Stock Compensation Plan for Non-Employee Directors (incorporated by reference from Exhibit 99 to Form S-8 filed January 25, 2001).

10.2 ONEOK, Inc. Supplemental Executive Retirement Plan terminated and frozen December 31, 2004 (incorporated by reference from Exhibit 10.1 to Form 8-K filed on December 20, 2004).

10.3 ONEOK, Inc. 2005 Supplemental Executive Retirement Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.3 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.4 Not used.

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10.5 Form of Indemnification Agreement between ONEOK, Inc. and ONEOK, Inc. officers and directors, as amended, dated January 1, 2003 (incorporated by reference from Exhibit 10.4 to Form 10-K for the fiscal year ended December 31, 2002, filed March 10, 2003).

10.6 Amended and Restated ONEOK, Inc. Annual Officer Incentive Plan (incorporated by reference from Exhibit 10.1 to Form 8-K filed May 27, 2009).

10.7 ONEOK, Inc. Employee Nonqualified Deferred Compensation Plan, as amended and restated December 16, 2004 (incorporated by reference from Exhibit 10.3 to Form 8-K filed December 20, 2004).

10.8 ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.8 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.9 ONEOK, Inc. Deferred Compensation Plan for Non-Employee Directors, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.9 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.10 Not used.

10.11 Not used.

10.12 Credit Agreement, dated as of April 5, 2011, among ONEOK, Inc., as borrower, the lenders party thereto, Bank of America, N.A., as administrative agent, swing line lender, and a letter of credit issuer, and JPMorgan Chase Bank, N.A. and The Royal Bank of Scotland plc, as letter of credit issuers (incorporated by reference from Exhibit 10.1 to ONEOK Inc.’s Current Report on Form 8-K filed on April 7, 2011 (File No. 001-13643)).

10.13 Amended and Restated Limited Liability Company Agreement of Overland Pass Pipeline Company LLC entered into between ONEOK Overland Pass Holdings, L.L.C. and Williams Field Services Company, LLC dated May 31, 2006 (incorporated by reference to Exhibit 10.6 to ONEOK Partners, L.P.’s Form 10-Q for the period ended June 30, 2006, filed on August 4, 2006 (File No. 1-12202)).

10.14 Form of ONEOK, Inc. Officer Change in Control Severance Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 22, 2011 (File No. 001-13643)).

10.15 Not used.

10.16 Not used.

10.17 Not used.

10.18 Not used.

10.19 Form of Restricted Unit Stock Bonus Award Agreement dated February 15, 2012.

10.20 Form of Performance Unit Award Agreement dated February 15, 2012.

10.21 Not used.

10.22 Commercial Paper Dealer Agreement between ONEOK Partners, L.P. and Citigroup Global Markets Inc. dated as of June 16, 2010 (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed on June 22, 2010).

10.23 Commercial Paper Dealer Agreement between ONEOK Partners, L.P. and Banc of America Securities LLC dated as of June 16, 2010 (incorporated by reference to Exhibit 10.2 to ONEOK, Inc.’s Current Report on Form 8-K filed on June 22, 2010).

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10.24 Commercial Paper Dealer Agreement between ONEOK Partners, L.P. and SunTrust Robinson Humphrey, Inc. dated as of June 16, 2010 (incorporated by reference to Exhibit 10.3 to ONEOK, Inc.’s Current Report on Form 8-K filed on June 22, 2010).

10.25 Purchase Agreement dated May 17, 2011, by and between ONEOK, Inc., and Barclays Bank PLC acting through Barclays Capital Inc. as agent (incorporated by reference to Exhibit 10.2 to ONEOK, Inc.’s Quarterly Report on Form 10-Q filed on August 3, 2011 (File No. 001-13643)).

10.26 Credit Agreement, dated as of August 1, 2011, among ONEOK Partners, L.P., as borrower, the lenders party thereto, Citibank, N.A., as administrative agent, swing line lender and a letter-of-credit issuer, and Barclays Bank and Wells Fargo Bank, N.A., as letter-of-credit issuers (incorporated by reference from Exhibit 10.1 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed August 2, 2011 (File No. 001-12202)).

10.27 Guaranty Agreement, dated as of August 1, 2011, by ONEOK Partners Intermediate Limited Partnership in favor of the Citibank, N.A., as administrative agent, under the above-referenced Credit Agreement (incorporated by reference from Exhibit 10.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed August 2, 2011 (File No. 001-12202)).

10.28 Underwriting Agreement dated January 23, 2012, among ONEOK, Inc. and J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein (incorporated by reference to Exhibit 4.1 to Form 8-K filed January 26, 2012).

10.29 Underwriting Agreement dated January 21, 2011, among ONEOK Partners, L.P. and ONEOK Partners Intermediate Limited Partnership and Citigroup Global Markets Inc., RBS Securities Inc. and UBS Securities LLC, therein (incorporated by reference to Exhibit 1.1 to the Current Report on Form 8-K filed by ONEOK Partners, L.P. on January 26, 2011 (File No. 001-12202)).

10.30 Not used.

10.31 Not used.

10.32 Services Agreement among ONEOK, Inc., Northern Plains Natural Gas Company, LLC, NBP Services, LLC, Northern Border Partners, L.P. and Northern Border Intermediate Limited Partnership executed April 6, 2006, but effective as of April 1, 2006 (incorporated by reference from Exhibit 10.1 to our Form 8-K filed April 12, 2006).

10.33 Third Amended and Restated Agreement of Limited Partnership of ONEOK Partners, L.P. dated as of September 15, 2006 (incorporated by reference to Exhibit 3.1 to ONEOK Partners, L.P.’s Form 8-K filed on September 19, 2006 (File No. 1-12202)).

10.34 Amendment No. 3 to Third Amended and Restated Agreement of Limited Partnership of ONEOK Partners, L.P. (incorporated by reference to Exhibit 3.1 to ONEOK Partners, L.P.’s Form 8-K filed on February 17, 2012 (File No. 1-12202)).

10.35 Not used.

10.36 Not used.

10.37 ONEOK, Inc. Profit Sharing Plan dated January 1, 2005 (incorporated by reference from Exhibit 99 to Registration Statement on Form S-8 filed December 30, 2004).

10.38 ONEOK, Inc. Employee Stock Purchase Plan as amended and restated effective as of December 20, 2007 (incorporated by reference from Exhibit 4.2 to Registration Statement on Form S-8 filed August 4, 2008).

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10.39 Form of Non-Statutory Stock Option Agreement (incorporated by reference from Exhibit 10.1 to Form 10-Q for the quarter ended September 30, 2004, filed November 3, 2004).

10.40 Not used.

10.41 Not used.

10.42 Not used.

10.43 Not used.

10.44 ONEOK, Inc. Equity Compensation Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.44 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.45 Form of Restricted Unit Award Agreement (incorporated by reference from Exhibit 10.45 to Form 10-K filed February 28, 2007).

10.46 Form of Performance Unit Award Agreement (incorporated by reference from Exhibit 10.46 to Form 10-K filed February 28, 2007).

10.47 Not used.

10.48 Not used.

10.49 Not used.

10.50 Thrift Plan for Employees of ONEOK, Inc. and Subsidiaries as amended and restated effective as of January 1, 2008 (incorporated by reference from Exhibit 4.3 to Registration Statement on Form S-8 filed August 4, 2008).

10.51 Amendment No. 1 to Third Amended and Restated Agreement of Limited Partnership of ONEOK Partners, L.P. dated July 20, 2007 (incorporated by reference to Exhibit 3.1 to ONEOK Partners, L.P.’s Form 10-Q filed on August 3, 2007 (File No. 001-12202)).

10.52 Amendment No. 2 to Third Amended and Restated Agreement of Limited Partnership of ONEOK Partners, L.P. dated July 12, 2011 (incorporated by reference to Exhibit 3.1 to ONEOK Partners, L.P.’s Form 8-K filed on July 12, 2011 (File No. 001-12202)).

10.53 Amendment No. 1 to Third Amended and Restated Limited Liability Company Agreement of ONEOK Partners GP, L.L.C. (incorporated by reference to Exhibit 10.1 to ONEOK Partners, L.P.’s Form 8-K filed on February 17, 2012 (File No. 1-12202)).

10.54 Form of Performance Unit Award Agreement dated January 15, 2009 (incorporated by reference from Exhibit 10.54 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.55 Form of Restricted Unit Stock Bonus Award Agreement dated January 15, 2009 (incorporated by reference from Exhibit 10.55 to Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009).

10.56 First Amended and Restated Limited Liability Company Agreement of ONEOK ILP GP, L.L.C. effective July 14, 2009 (incorporated by reference to Exhibit 99.2 to ONEOK Partners, L.P.’s report on Form 8-K filed on July 17, 2009).

10.57 Form of Restricted Unit Stock Bonus Award Agreement dated February 18, 2010 (incorporated by reference from Exhibit 10.57 to Form 10-K/A for the fiscal year ended December 31, 2009, filed October 12, 2010).

131

10.58 Form of Performance Unit Award Agreement dated February 18, 2010 (incorporated by reference from Exhibit 10.58 to Form 10-K/A for the fiscal year ended December 31, 2009, filed October 12, 2010).

10.59 Form of Restricted Unit Stock Bonus Award Agreement (incorporated by reference from Exhibit 10.59 to Form 10-K for the fiscal year ended December 31, 2010, filed February 22, 2011).

10.60 Form of Performance Unit Award Agreement (incorporated by reference from Exhibit 10.60 to Form 10-K for the fiscal year ended December 31, 2010, filed February 22, 2011).

12 Computation of Ratio of Earnings to Fixed Charges for the years ended December 31, 2011, 2010, 2009, 2008 and 2007.

16 Not used.

21 Required information concerning the registrant’s subsidiaries.

23 Consent of Independent Registered Public Accounting Firm - PricewaterhouseCoopers LLP.

23.1 Not used.

31.1 Certification of John W. Gibson pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.2 Certification of Robert F. Martinovich pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1 Certification of John W. Gibson pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).

32.2 Certification of Robert F. Martinovich pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).

101.INS XBRL Instance Document

101.SCH XBRL Taxonomy Extension Schema Document

101.CAL XBRL Taxonomy Calculation Linkbase Document

101.DEF XBRL Taxonomy Extension Definitions Document

101.LAB XBRL Taxonomy Label Linkbase Document

101.PRE XBRL Taxonomy Presentation Linkbase Document

Attached as Exhibit 101 to this Annual Report are the following XBRL-related documents: (i) Document and Entity Information; (ii) Consolidated Statements of Income for the years ended December 31, 2011, 2010 and 2009; (iii) Consolidated Statements of Comprehensive Income for the years ended December 31, 2011, 2010 and 2009; (iv) Consolidated Balance Sheets at December 31, 2011 and 2010; (v) Consolidated Statements of Cash Flows for the years ended December 31, 2011, 2010 and 2009; (vi) Consolidated Statements of Shareholders’ Equity for the years ended December 31, 2011, 2010 and 2009; and (vii) Notes to Consolidated Financial Statements.

We also make available on our website the Interactive Data Files submitted as Exhibit 101 to this Annual Report.

132

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ONEOK, Inc.

Registrant

Date: February 21, 2012                                                                                     By:  /s/ Robert F. Martinovich

Robert F. Martinovich

Executive Vice President,

Chief Financial Officer and Treasurer

Pursuant to the requirements of the Exchange Act, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on this 21st day of February 2012.

/s/ John W. Gibson	/s/ Robert F. Martinovich
John W. Gibson	Robert F. Martinovich
Chairman and	Executive Vice President,
Chief Executive Officer	Chief Financial Officer and Treasurer
/s/ Derek S. Reiners	/s/ James C. Day
Derek S. Reiners	James C. Day
Senior Vice President and	Director
Chief Accounting Officer
/s/ Julie H. Edwards	/s/ William L. Ford
Julie H. Edwards	William L. Ford
Director	Director
	/s/ Steven J. Malcolm
Bert H. Mackie	Steven J. Malcolm
Director	Director
/s/ Jim W. Mogg	/s/ Pattye L. Moore
Jim W. Mogg	Pattye L. Moore
Director	Director
/s/ Gary D. Parker	/s/ Eduardo A. Rodriguez
Gary D. Parker	Eduardo A. Rodriguez
Director	Director
/s/ Gerald B. Smith	/s/ David J. Tippeconnic
Gerald B. Smith	David J. Tippeconnic
Director	Director

133

EX-10.19

Exhibit 10.19

RESTRICTED UNIT

STOCK BONUS AWARD

AGREEMENT

This instrument is issued as of the 15th day of February, 2012, by ONEOK, Inc., an Oklahoma corporation, (hereinafter referred to as “Corporation”), to «Officer_Name» (hereinafter referred to as “Grantee”), an employee of the Corporation or a division or subsidiary thereof, pursuant to the terms of the ONEOK, Inc. Long-Term Incentive Plan, as amended (hereinafter referred to as the “Plan”).

1.Restricted Unit Award.  This instrument and that certain Restricted Unit Stock Bonus Award and Agreement, dated February 15, 2012, a copy of which is attached hereto and incorporated herein by reference (the “Notice of Restricted Unit Stock Bonus Award and Agreement”) constitute evidence of the issuance and grant of a Stock Bonus Award (hereinafter referred to as "Award") to the Grantee by the Corporation under the Plan pursuant to which shares of the Corporation's Common Stock (hereinafter referred to as "Common Stock") shall be distributed in the future to the Grantee in lieu of, or as a supplement to, any other compensation that may have been earned by services rendered prior to the date the distribution is made, pursuant to and in accordance with the terms of this instrument under which the Corporation grants a Stock Bonus Award under the Plan that shall include and is to be awarded by the grant restricted stock units (hereinafter referred to a "Restricted Units) under the Plan in the amount of «No_of_Restricted_Units» Restricted Units that shall entitle the Grantee to receive shares of Common Stock  all subject to the terms, provisions, and conditions of this instrument (including, without limitation, the restrictions stated in paragraph 5, below) and of the Plan, which are incorporated herein by reference.  This instrument, when executed by the Grantee, together with the Notice of Restricted Unit Stock Bonus Award and Agreement constitute an agreement between the Corporation and the Grantee.  Notwithstanding the foregoing, should there be any inconsistency between the provisions of this instrument and the terms of the Award stated in the resolutions and records of the Board of Directors of the Corporation, or the Plan, the provisions of such resolutions and records and of the Plan shall control.  The grant of Restricted Units to the Grantee and the Grantee’s entitlement to receive and be issued shares of Common Stock shall be effective in the manner and to the extent provided in this instrument and the Plan as to all or any part of the shares of Common Stock subject to the grant from time to time during the period stated herein.

2.Plan.  The Award is issued pursuant to the Plan, as approved by the Shareholders of the Corporation, which provides that a specific aggregate number of shares of Common Stock of the Corporation may be issued or transferred pursuant to Stock Incentives under the Plan.  The Plan specifies the authority of the Corporation, its Board of Directors, and a committee of the Board of Directors to select employees to be granted Stock Incentives.  The Executive Compensation Committee of the Board of Directors (hereinafter referred to as the “Committee”) is authorized to administer the Plan with respect to the Award and the grant of the Award made to the Grantee pursuant to the Plan.  Except where expressly stated or clearly indicated otherwise by the terms of this instrument, all terms, words and phrases used herein shall have the same meaning and effect as stated in the Plan.  The Grantee has been provided a complete copy of the Plan with this instrument.

3.Grantee’s Agreement Concerning Award and Employment.  In consideration of the Corporation’s granting the Award as incentive compensation to Grantee pursuant to this instrument, the Grantee by acceptance thereof, and signing this instrument evidencing its terms, agrees to such terms and to continue to contribute and perform service in the employ of the Corporation (or a division or subsidiary thereof) at the direction, will and pleasure of the Corporation and the Board of Directors.  Provided, however, neither the foregoing agreement of the Grantee in this paragraph 3, nor any other provision in the Plan shall confer on the Grantee any right to continue in the employ of the Corporation (or a division or subsidiary thereof), or interfere in any way with the right of the Corporation (or such division or subsidiary) to terminate the Grantee’s employment at any time.

4.Registration of Stock; Grantee’s Representation With Respect to Acquiring for Investment.  It is intended by the Corporation that the Plan and shares of Common Stock covered by the Award issued and granted to the Grantee referred to in paragraph 1, above, are to be registered under the Securities Act of 1933, as amended, prior to the date of the grant; provided, that in the event such registration is for any reason not made effective for such shares, the Grantee agrees, for the Grantee, and for the Grantee’s heirs and legal representatives by inheritance or bequest, that all shares acquired pursuant to the grant will be acquired for investment and not with a view to, or for sale or tender in connection with the distribution of any part thereof, including any transfer or distribution of such shares by the Grantee pursuant to the grant and this instrument or as otherwise allowed by the Plan.

5.Restrictions; Restricted Period; Transfer of Common Stock to Grantee.  The issue and grant of the Award to the Grantee stated in paragraph 1, above, are subject to the following terms and conditions:

(a)The ownership and transfer of the Restricted Units granted to the Grantee shall be restricted during the period beginning February 15, 2012, the date of the grant thereof (hereinafter referred to as “Grant Date”) and ending on February 15, 2015, (which period is hereinafter referred to as “Restricted Period”), as herein provided.

(b)The Restricted Units, or any Common Stock or cash to be paid or transferred to Grantee as a Stock Bonus Award under the Plan pursuant to the Award may not be sold, assigned, transferred, pledged, encumbered or otherwise disposed of by Grantee or any other person except as provided in this instrument and the Plan until the expiration of the Restricted Period.

(c)The Grantee shall earn and become vested and entitled to the Restricted Units granted by this Award under paragraph 1, above, at the expiration of the Restricted Period.  Upon expiration of the Restricted Period, the Grantee shall be entitled to receive, and the Corporation shall issue to Grantee one (1) share of Common Stock for each Restricted Unit that becomes earned by and vested in the Grantee pursuant to the Award.  The Common Stock the Grantee becomes entitled to receive under the Award shall be paid, distributed, transferred and issued on the date of expiration of the Restricted Period, or as soon as practicable after such date as determined by the Committee, but in no event after the 15th day of the third month after such date.

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(1)The Grantee shall become vested in the Restricted Units granted to the Grantee hereunder and Common Stock paid and transferred pursuant to the Award free and clear of all restrictions imposed by the Award if the Grantee’s employment by the Corporation (or a division or Subsidiary thereof) does not terminate during the Restricted Period; provided, that the Grantee shall become partially vested in the Restricted Units and Common Stock payable pursuant to the Award and the restrictions imposed by the Award shall partially cease to apply in certain events to the extent described in paragraph 6(d), below.

(2)      If the Grantee’s employment with the Corporation (or a division or Subsidiary thereof) terminates prior to the end of the Restricted Period by reason of (i) the Grantee’s voluntary termination of the Grantee’s employment with the Corporation (or a division or Subsidiary), or (ii) the involuntary Termination for Cause by the Corporation of the Grantee’s employment with the Corporation (or a division or Subsidiary), the Grantee shall forfeit all the Grantee’s right, title or interest in the Restricted Units, and to any Common Stock payable or to be issued pursuant to the Award; and the Grantee shall forfeit such right, title and interest in the Restricted Units, and to any Common Stock payable or to be issued pursuant to the Award regardless of the reason for such termination of employment.  Any such termination of employment of the Grantee described in the preceding sentence shall not be deemed to occur by reason of transfer of employment of the Grantee by or between the Corporation and any division or Subsidiary of the Corporation.

(3)The Grantee shall not be entitled to vote any shares of Common Stock that may be issued to the Grantee pursuant to the Award prior to the end of the Restricted Period and actual issuance of such Common Stock to the Grantee pursuant to the Award.

(4)No dividends with respect to shares of Common Stock that may be issued to the Grantee under the Award shall accrue or become payable to the Grantee prior to the end of the Restricted Period and issuance of such Common Stock to Grantee pursuant to the Award.

6.Transferability of Restricted Units, Cash or Common Stock; Termination of Employment.

(a)Except as provided in subparagraph (b) of this paragraph 6, below, this instrument, the Grantee’s rights and obligations hereunder, and the Restricted Units granted hereunder shall not be transferable by the Grantee otherwise than by will or the laws of descent and distribution which apply to the Grantee’s estate.

(b)Notwithstanding the foregoing, the Grantee may transfer any part or all of the Grantee’s rights in the Restricted Units to members of the Grantee’s immediate family, or to one or more trusts for the benefit of such immediate family members, or partnerships in which such immediate family members are the only partners if the Grantee does not receive any consideration for the transfer.  In the event of any such transfer, Restricted Units shall continue to be subject to the same terms and conditions otherwise applicable hereunder and under the Plan immediately prior to its transfer, except that such rights shall not be further transferable by the transferee inter vivos, except for transfer back to the original Grantee.  For any such transfer to be effective, the Grantee must provide prior written notice thereof to the Committee, unless

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otherwise authorized and approved by the Committee, in its sole discretion; and the Grantee shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer.  For purposes of transfer of this grant under this subparagraph (b), “immediate family” shall mean the Grantee’s spouse, children and grandchildren.

(c)Notwithstanding anything to the contrary expressed or implied herein (including without limitation, the restrictions stated in paragraph 5, above, applicable to the Restricted Units), all rights and interest of the Grantee in the Restricted Units shall become invalid and wholly terminated and forfeited upon (i) the Grantee’s voluntary termination of the Grantee’s employment with the Corporation (or a division or Subsidiary), or (ii) the involuntary Termination for Cause by the Corporation of the Grantee’s employment with the Corporation (or a division or Subsidiary).

(d)Notwithstanding the foregoing provisions, in the event of termination of the Grantee’s employment with the Corporation (or a division or Subsidiary) during the Restricted Period by reason of (i) the involuntary termination of the Grantee’s employment with the Corporation (or a division or Subsidiary) other than a Termination for Cause (ii) the Retirement of the Grantee, (iii) the Total Disability of the Grantee, or (iv) the Grantee’s death while still employed by the Corporation (or a division or Subsidiary), then partial vesting shall be allowed as provided in this paragraph 6(d) and the Grantee shall become vested in and receive, in the event of any such involuntary termination of employment other than a Termination for Cause, Retirement or Total Disability, and the legatees, designated Beneficiary, personal representative or heirs of the Grantee shall be vested in and entitled to receive, in the event of the Grantee’s death, the percentage of the Restricted Units which is determined by dividing the number of full months which have elapsed under the Restricted Period at the time of such termination of employment by the number of full months in the Restricted Period.  The Grantee, or legatees, designated Beneficiary, personal representative or heirs of the Grantee, as applicable, shall be entitled to receive and the Corporation shall issue, to the Grantee, or such legatees, designated Beneficiary, personal representative or heirs, as applicable, one share of Common Stock for each vested Restricted Unit, which shall be issued, paid and transferred pursuant to the Award free and clear of all restrictions imposed by the Award on the date of expiration of the Restricted Period, or as soon as practicable thereafter as determined by the Committee, but in no event later than the 15th day of the third calendar month after the date of the expiration of the Restricted Period.

(e)The Grantee may designate a Beneficiary to receive any rights of the Grantee which may become vested in the event of the death of the Grantee under procedures and in the form established by the Committee; and in the absence of such designation of a beneficiary, any such rights shall be deemed to be transferred to the estate of the Grantee.

(f)       For purposes of the Award and this instrument, an “involuntary termination” shall mean that the Corporation (or a division or Subsidiary) has ended the Grantee’s employment with the Corporation (or a division or Subsidiary) without the Grantee having an opportunity to continue employment with the Corporation (or a division or Subsidiary); an “involuntary Termination for Cause” of the Grantee’s employment with and by the Corporation (or a division or Subsidiary) shall mean that the Corporation (or a division or

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Subsidiary) has ended such employment by reason of (i) the Grantee’s conviction in a court of law of a felony, or any crime or offense involving misuse or misappropriation of money or property, (ii) the Grantee’s violation of any covenant, agreement or obligation not to disclose confidential information regarding the business of the Corporation (or a division or Subsidiary), (iii) any violation by the Grantee of any covenant not to compete with the Corporation (or a division or Subsidiary), (iv) any act of dishonesty by the Grantee which adversely effects the business of the Corporation (or a division or Subsidiary), (v) any willful or intentional act of the Grantee which adversely affects the business of, or reflects unfavorably on the reputation of the Corporation (or a division or Subsidiary), (vi) the Grantee’s use of alcohol or drugs which interferes with the Grantee’s performance of duties as an employee of the Corporation (or a division or Subsidiary), or (vii) the Grantee’s failure or refusal to perform the specific directives of the Corporation’s Board of Directors, or its officers which directives are consistent with the scope and nature of the Grantee’s duties and responsibilities with the existence and occurrence of all of such causes to be determined by the Corporation, in its sole discretion; provided, that nothing contained in the foregoing provisions of this paragraph shall be deemed to interfere in any way with the right of the Corporation (or a division or Subsidiary), which is hereby acknowledged, to terminate the Grantee’s employment at any time without cause; and “voluntary termination” shall mean that the Grantee had an opportunity to continue employment with the Corporation (or a division or Subsidiary), but did not do so.

 (g)      For purposes of the Award and this instrument, "Retirement" shall mean a voluntary termination of employment of the Grantee with the Corporation (or a division or Subsidiary) by the Grantee if at the time of such termination of employment the Grantee has both completed five (5) years of service with the Corporation (or a division or Subsidiary) and attained age fifty (50); and “Total Disability” shall mean that the Grantee is permanently and totally disabled and unable to engage in any substantial gainful activity by reason of a medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than twelve (12) months, and has established such disability to the extent and in the manner and form as may be required under the provisions of Section 22(e)(3) of the Internal Revenue Code of 1986, as amended (or corresponding section of any future federal tax code), and regulations thereunder.

7.Deferral of Payment, Distribution and Transfer of Stock.

(a)The payment, distribution and transfer of Restricted Units, Common Stock and cash of the Grantee becomes entitled to receive upon the Grantee's separation from service with the Corporation upon the Grantee's Retirement prior to the expiration of the Restricted Period under paragraph 6 (d), above, shall be paid, distributed and transferred to the Grantee in a single payment, distribution and transfer at the Specified Time of the Grantee's separation from service with the Corporation by such Retirement, as soon as practicable thereafter as determined by the Committee,  but in no event later than the 15th day of the third calendar month after date of such Retirement, and the Grantee shall not be permitted, directly or indirectly, to designate the time of payment, distribution and transfer or the taxable year in which it is to be made.  The Specified Time of payment, distribution and transfer of any other compensation that is deferred under this instrument or the Award shall be the date of expiration of the Restricted Period, or as soon as practicable thereafter as determined by the Committee, but in no event later than the 15th day of the third calendar month after the date of expiration of the Restricted Period, and the

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Grantee shall not be permitted, directly or indirectly, to designate the time of payment, distribution or transfer or the taxable year in which it is to be made.

(b)The Specified Time of payment and form of payment specified in paragraph 6(a), above shall be considered as the irrevocable deferral election of the Corporation and the Grantee of the time and form of payment for purposes of the application to this instrument and the Award of the provisions of Section 409A of the Internal Revenue Code of 1986, as amended, and the provisions of this instrument related thereto.  No other election to defer compensation, or subsequent election or acceleration of the time and form of payment of compensation is intended or shall be allowed.

(c)The Award shall be subject to such other rules and requirements as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof and the restrictions made applicable to the Grantee and the Restricted Units during the Restricted Period.  This instrument and the rights and obligations of the parties involved, shall be subject to interpretation and construction by the Committee to the same extent and with the same effect as the Committee actions under pertinent provisions of the Plan.  The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee in connection with such restrictions and in furtherance hereof.  The Grantee agrees to pay to the Corporation any applicable federal, state, or local income, employment, social security, Medicare, or other withholding tax obligation arising in connection with the grant of the Award to the Grantee; and the Corporation shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the Common Stock that would otherwise be transferred and delivered to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value (as defined in the Plan) on the date of such withholding. The Grantee, with the consent of the Corporation, may satisfy such withholding tax by delivery and transfer to the Corporation of shares of Common Stock previously owned by the Grantee, with any shares so delivered and transferred to be valued at the Fair Market Value on the date of such delivery.

(d)The provisions of this instrument providing for the deferral of payment, distribution, transfer or issuance of Restricted Units, Common Stock or cash shall be applicable solely and exclusively to the Grantee and the Award Agreement and Award referred to herein, and shall not apply to any other stock incentive or other grant, award or transfer provided for or made under the Plan.

(e)Notwithstanding anything otherwise provided under the Plan or in this instrument  the following requirements shall apply to this Award Agreement and the Award, to all elections or subsequent elections made by the Grantee, and to all distributions and payments made to the Grantee pursuant to this Award Agreement and Award:

(1)Any compensation for services performed by the Grantee during a taxable year may be deferred  only if the election to defer such compensation by the Grantee or the Corporation is made not later than the close of the preceding taxable year or such other time as provided in Treasury Regulations under section 409A of the Internal Revenue Code of 1986, as amended ("Code"), but in all events any deferral of the payment, distribution, transfer or

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issuance of Restricted Units, Common Stock or cash pursuant to the Award and Award Agreement may be made only by an election that is made on or before the Election Date.

(2)	Any compensation deferred shall not be distributed earlier than:
		(i)	Separation from Service of the Grantee,
		(ii)	the date the Grantee becomes Disabled,
		(iii)	death of the Grantee,
		(iv)	Specified Time (or pursuant to a Fixed Schedule) specified under the plan under which the compensation is deferred at the date of deferral of such compensation,
		(v)	a Change in Ownership or Control, or
		(vi)	the occurrence of Unforeseeable Emergency.

(3)If the Grantee is a Specified Employee, no payment or distribution shall be made before the date which is six (6) months after the date of the Grantee's Separation from Service, or, if earlier, the date of death of the Grantee.

(4)No acceleration of the time or schedule of any distribution or payment under the plan under which compensation is deferred shall be permitted or allowed, except to the extent provided in Treasury Regulations issued under Code section 409A.

(5)This instrument shall not permit a subsequent election, unless authorized and agreed to in writing by the Corporation and Grantee; and if under the Plan or this instrument compensation is deferred or the Committee acting pursuant to the Plan, permits under any subsequent election by a Participant a delay in a payment or a change in the form of payment of compensation deferred under this Award Agreement and Award, such subsequent election shall not take effect until at least twelve (12) months after the date on which it is made.  In the case of a subsequent election related to a payment to be made upon Separation from Service of the Grantee, at a Specified Time or pursuant to a Fixed Schedule, or upon a Change in Ownership or Control, the first payment with respect to which such subsequent election is made shall be deferred for a period of not less than five (5) years from the date such payment would otherwise have been made; and any such subsequent election related to a payment at a Specified Time or pursuant to a Fixed Schedule may not be made less than twelve (12) months prior to the date of the first scheduled payment to which it relates.

(6)For purposes of the Plan, this instrument and the Award, and the entitlement to and time of payment of any compensation deferred under this instrument or the Award, the following terms and definitions shall apply:

(i)"Change of Ownership or Control" means to the extent provided by Treasury Regulations issued under Code Section 409A, a change in the

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ownership or effective control of the Corporation, or in the ownership of a substantial portion of the assets of the Corporation, which shall be if (i) a Person acquires more than 50% of the  Corporation’s stock; (ii) a Person acquires during a 12-month period at least 30% (or a higher percentage specified under the Plan) of the Corporation’s stock; (iii) a majority of the members of the Board of Directors of the Corporation are replaced during a 12-month period; or (iv) a  Person acquires during a 12-month period at least 40% of the gross fair market value of the Corporation’s assets.

(ii)"Disabled" means that an individual (i) is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, or (ii)  is, by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, receiving income replacement benefits for a period of not less than 3 months under an accident and health plan covering employees of the individual's employer.

(iii)"Fixed Schedule" means the distribution or payment of compensation deferred under this instrument and award in a fixed schedule of distributions or payments that are determined and fixed at the time the deferral of such compensation is first elected by the Grantee or the Corporation.

(iv)"Specified Employee" means a key employee (as defined in Code section 416(i) without regard to paragraph (5) thereof) of the Corporation.

(v)"Specified Time" means a specified date at which deferred compensation deferred by or for the Grantee pursuant to this instrument and Award is required to be distributed or paid and which is specified at the time of the election of deferral of such deferred compensation.

(vi)“Unforeseeable Emergency” means a severe financial hardship to the participant resulting from an illness or accident of the participant, the participant's spouse, or a dependent (as defined in Code section 152(a)) of the participant, loss of the participant's property due to casualty, or other similar extraordinary and unforeseeable circumstances arising as a result of events beyond the control of the participant. As determined under Treasury Regulations under Code section 409A, the amounts distributed with respect to an emergency shall not exceed the amounts necessary to satisfy such emergency plus amounts necessary to pay taxes reasonably anticipated as a result of the distribution, after taking into account the extent to which such hardship is or may be relieved through reimbursement or compensation by insurance or otherwise or by liquidation of the participant's assets (to the extent the liquidation of such assets would not itself cause severe financial hardship).

8.Administration of Restricted Unit Award.  The grant of the Award shall be subject to such other rules and requirements as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof and the restrictions made applicable to the Grantee and the Restricted Units during the Restricted Period.  This instrument and the rights and obligations of the parties involved, shall be subject to interpretation and construction by the

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Committee to the same extent and with the same effect as the Committee actions under pertinent provisions of the Plan.  The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee in connection with such restrictions and in furtherance hereof.  The Grantee agrees to pay to the Corporation any applicable federal, state, or local income, employment, social security, Medicare, or other withholding tax obligation arising in connection with the grant of the Award to the Grantee; and the Corporation shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the Common Stock that would otherwise be transferred and delivered to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value (as defined in the Plan) on the date of such withholding. The Grantee, with the consent of the Corporation, may satisfy such withholding tax by delivery and transfer to the Corporation of shares of Common Stock previously owned by the Grantee, with any shares so delivered and transferred to be valued at the Fair Market Value on the date of such delivery.

9.Adjustment Provisions.  It is understood that, prior to the expiration of the Restricted Period, certain changes in capitalization of the Corporation may occur.  It is, therefore, understood and agreed with respect to changes in capitalization that:

(a)If a stock dividend is declared on the Common Stock of the Corporation, there shall be added to the number of Restricted Units described in paragraph 1 of this instrument, the number of Restricted Units which the Grantee would have been entitled to if the Grantee had been fully vested and the unrestricted owner of the number of Restricted Units then held under the Award granted, but not theretofore received without restriction; provided, however, that the additional Restricted Units shall be subject to all terms and provisions of this instrument (including, without limitation, the restrictions stated in paragraph 5, above), and in making such adjustments, no fractional Restricted Units shall be awarded, and the Grantee shall be entitled to receive only the number of full Restricted Units to which the Grantee may be entitled by reason of such adjustment at the adjusted grant price per share.

(b)In the event of an increase in the outstanding shares of Common Stock of the Corporation, effectuated for the purpose of acquiring properties or securities of another corporation or business enterprise, there shall be no increase in the number of shares of Restricted Units which are the subject matter of the Award evidenced by this instrument as a result of such acquisition.

(c)In the event of an increase or decrease in the number of outstanding shares of Common Stock of the Corporation through recapitalization, reclassification, stock split-ups, consolidation of shares, changes in par value and the like, an appropriate adjustment shall be made in the number of Restricted Units described in paragraph 1 of this instrument, by increasing or decreasing the number of Restricted Units, as may be required to enable the Grantee to acquire the same proportionate stockholdings as the grant of the Award would originally have provided.  Provided, however, that any additional Restricted Units shall be subject to all terms and provisions of this instrument (including, without limitation, the restrictions stated in paragraph 5, above), and that in making such adjustments, no fractional Restricted Units shall be awarded, and the Grantee shall be entitled to receive only the number of full Restricted Units to which the Grantee may be entitled by reason of such adjustment.

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(d)Except with respect to the time of payment of any compensation deferred under this instrument, to the extent Restricted Units are still restricted and not vested in Grantee at the time of a Change in Control with respect to the Corporation, then pursuant to the provisions of the Plan, they shall become fully vested and completely unrestricted and free and clear of any restrictions stated herein at that time; provided, that if such Change in Control occurs less than six (6) months after the date of the grant of Restricted Units to the Grantee, then Restricted Units shall become fully vested and completely unrestricted and free and clear of any restrictions stated herein at the time of such Change in Control only if the Grantee agrees in writing, if requested by the Corporation in writing, to remain in the employ of the Corporation or a division or subsidiary of the Corporation at least through the date which is six (6) months after the date the grant was made with substantially the same title, duties, authority, reporting relationships, and compensation as on the day immediately preceding the Change in Control.  The provisions of this subparagraph (d) shall be applied in addition to, and shall not reduce, modify, or change any other obligation or right of the Grantee otherwise provided for in paragraph 3, above, concerning the Grantee’s continued employment with the Corporation or the termination thereof.  If the Restricted Units become subject to this subparagraph (d), they shall become fully vested in the Grantee and nonforfeitable.  Such Restricted Units are subject to the provisions of the Plan authorizing the Corporation, or a committee of its Board of Directors, to provide in advance or at the time of a Change in Control for cash to be paid in settlement of the Restricted Units, all subject to such terms and conditions as the Corporation or the Committee, in its sole discretion, may determine and impose.  For purposes of this subparagraph (d), the term “Change in Control” shall have the same meaning as provided in the definition of that term stated in the Plan, including any amendments thereof which may be made from time to time in the future pursuant to the provisions of the Plan, with any amended definition of such term to apply to all events thereafter coming within the amended meaning.

10.Required Grantee Repayment/Reduction Provision.  Notwithstanding anything in the  Plan, the Award or this instrument to the contrary, all or a portion of the Award made to the Grantee  under this instrument  is subject to being called for repayment to the Corporation or reduced in any situation where the Board of Directors of the Corporation or a Committee thereof determines that fraud, negligence, or intentional misconduct by the Grantee  was a contributing factor to the Corporation having to restate all or a portion of its financial statement(s). The Committee may determine whether the Corporation  shall effect any such repayment or reduction : (i) by seeking repayment from the Grantee , (ii) by reducing (subject to applicable law and the terms and conditions of the Plan or any other applicable plan, program, or arrangement) the amount that would otherwise be awarded or payable to the Grantee  under the Award, the Plan or any other compensatory plan, program, or arrangement maintained by the Corporation , (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Corporation's  otherwise applicable compensation practices, or (iv) by any combination of the foregoing. The determination regarding the Grantee’s conduct, and repayment or reduction under this provision shall be within the sole discretion of the Committee and shall be final and binding on the Grantee and the Corporation. The Grantee, in consideration of the grant of the Award, and by the Grantee's execution of this instrument, acknowledges the Grantee's understanding of and agreement to this provision, and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the

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event of a call for repayment or other action by the Corporation or Committee to effect its terms with respect to the Grantee, the Award and/or any other compensation described herein.

11.Stock Reserved.  The Corporation shall at all times during the term of the Award reserve and keep available such number of shares of its Common Stock as will be sufficient to satisfy the Award issued and granted to Grantee and the terms stated in this instrument, and shall pay all original issue taxes, if any, on the transfer of the Common Stock to the Grantee and all other fees and expenses necessarily incurred by the Corporation in connection therewith.

12.Rights of Shareholder.  Except as otherwise provided in this instrument, the Grantee shall have no rights as a shareholder of the Corporation in respect of the Restricted Units or Common Stock for which the Award is granted; and the Grantee shall not be considered or treated as a record owner of shares of Common Stock with respect to the Restricted Units until the Common Stock is issued to Grantee and no longer subject to any of the restrictions imposed under the Award indicated in this instrument, and Common Stock is actually issued and transferred to Grantee.

13.Entire Agreement.  This instrument contains the entire terms of the Award, and may not be changed orally or other than by a written instrument issued and approved by the Corporation pursuant to the Plan.  This instrument supersedes any agreements or understandings that may have previously existed, and there are no other agreements or understandings, relating to its subject matter.

14.Successors and Assigns.  The Award evidenced by this instrument shall inure to the benefit of and be binding upon the heirs, legatees, legal representatives, successors, and assigns of the parties hereto.

The Grantee hereby acknowledges receipt of this instrument, the Notice of Restricted Unit Award Agreement and a copy of the Plan, and accepts the Award under the terms and conditions stated in this instrument, subject to all terms and provisions of the Plan, by signing this instrument in duplicate originals, as of the date first stated above.

Date	«Officer_Name»
	Grantee

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EX-10.20

Exhibit 10.20

PERFORMANCE UNIT AWARD AGREEMENT

This instrument is issued as of the 15th day of February, 2012, by ONEOK, Inc., an Oklahoma corporation, (hereinafter referred to as “Corporation”), to «Officer_Name» (hereinafter referred to as “Grantee”), an employee of the Corporation or a division or subsidiary thereof, pursuant to the terms of the ONEOK, Inc. Equity Compensation Plan, effective February 17, 2005, as amended (hereinafter referred to as the “Plan”).

1.Performance Unit Award.  This instrument and that certain Notice of Performance Unit Award and Agreement, dated February 15, 2012, a copy of which is attached hereto and incorporated herein by reference (the “Notice of Performance Unit Award and Agreement”), constitute evidence of the issuance and grant of a Performance Unit Award (hereinafter referred to as “Award”) of «No_of_Perf_Units» Performance Units to the Grantee by the Corporation that shall entitle the Grantee to receive shares of the Corporation’s Common Stock (hereinafter also referred to as “Common Stock”) or cash, all pursuant and subject to the terms, provisions, and conditions of this instrument (including, without limitation, the conditions, restrictions and limitations stated in paragraph 5, below) and the terms and provisions of the Plan, which are incorporated herein by reference.  This instrument, when executed by the Grantee, together with the Notice of Performance Unit Award and Agreement constitute an agreement between the Corporation and the Grantee.  Notwithstanding the foregoing, should there be any inconsistency between the provisions of this instrument and the terms and provisions of the Award stated in the resolutions and records of the Board of Directors of the Corporation providing for the Award or provisions of the Plan, the provisions of such resolutions and records and of the Plan shall control.  The grant of such Performance Units to the Grantee shall be effective in the manner and to the extent provided in this instrument and the Plan as to all or any part of the shares of Common Stock subject to the grant from time to time during the period stated herein.

2.Plan.  The Award is made to the Grantee pursuant to the terms and provisions of the Plan, as approved by the Shareholders of the Corporation, which Plan provides that a specific aggregate number of shares of Common Stock of the Corporation may be issued or transferred pursuant to Stock Incentives under the Plan.  The Plan specifies the authority of the Corporation, its Board of Directors, and a committee of the Board of Directors to select employees to be granted Stock Incentives under the Plan.   The Executive Compensation Committee of the Board of Directors (hereinafter referred to as the “Committee”) is authorized to administer the Plan with respect to this instrument and the grant of the Award made to the Grantee pursuant to the Plan.  Except where expressly stated or clearly indicated otherwise by the terms of this instrument, all terms, words and phrases used herein shall have the same meaning and effect as stated in the Plan.  The Grantee has been provided a complete copy of the Plan with this instrument.

3.Grantee’s Agreement Concerning Award and Employment.  In consideration of the Corporation’s granting of the Award of Performance Units and entitlement to shares of Common Stock, as incentive compensation to Grantee pursuant to this instrument, the Grantee, by acceptance thereof, and signing this instrument evidencing its terms, agrees to such terms and to continue to contribute and perform service in the employ of the Corporation or a division or subsidiary thereof, at the direction, will and pleasure of the Corporation and the Board of

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Directors.  Provided, however, neither the foregoing agreement of the Grantee in this paragraph 3, nor any other provision in this instrument shall confer on the Grantee any right to continue in the employ of the Corporation (or a division or Subsidiary thereof), or interfere in any way with the right of the Corporation (or such division or Subsidiary) to terminate the Grantee’s employment at any time.

4.Registration of Stock; Grantee’s Representation With Respect To Acquiring for Investment.  It is intended by the Corporation that the Plan and the shares of Common Stock covered by the Award issued and granted to the Grantee referred to in paragraph 1, above, are to be registered under the Securities Act of 1933, as amended, prior to the date of the grant; provided, that in the event such registration is for any reason not made effective for such shares, the Grantee agrees, for the Grantee, and for the Grantee’s permissible assignees, heirs and legal representatives by inheritance or bequest, that all shares acquired pursuant to the grant will be acquired for investment and not with a view to, or for sale or tender in connection with the distribution of any part thereof, including any transfer or distribution of such shares by the Grantee pursuant to the grant and this instrument or as otherwise allowed by the Plan.

5.Terms and Conditions of Award; Transfer of Stock to Grantee.  The issue and grant of the Award of Performance Units to the Grantee stated in paragraph 1, above, shall be subject to the following terms and conditions:

(a)      The right to ownership and transfer of the Performance Units granted to the Grantee shall be subject to the Award during the period beginning February 15, 2012, the date of the grant thereof (hereinafter referred to as “Grant Date”), and ending on February 15, 2015, (which period is hereinafter referred to as “Performance Period”), as herein provided.

(b)      The Grantee shall earn and become entitled to receive a percentage of the number of Performance Units granted under paragraph 1, above, at the expiration of the Performance Period as provided for in Exhibit A and Exhibit B, attached hereto, based upon the Corporation’s ranking for Total Stockholder Return in the ONEOK Peer Group listed in Exhibit C attached hereto, all as determined by the Committee, in its sole discretion (the “Performance Goal”).

(c)      Upon expiration of the Performance Period, the Grantee shall be entitled to receive one (1) share of Common Stock for each Performance Unit that becomes earned by and vested in the Grantee pursuant to the Award; provided, no fractional shares shall be issued and any amount attributable to a fractional share shall be paid to the Grantee in cash.

(d)      All Common Stock the Grantee becomes entitled to receive pursuant to the Award and any other compensation payable to the Grantee under the Award shall be paid, distributed, transferred  and issued by the Corporation to the Grantee at the expiration of the Performance Period, or as soon as practicable after the determination that the Grantee has earned and become entitled to Performance Units and to receive such Common Stock and cash, as determined by the Committee,  and in no event later than the 15th day of the third month after the date of expiration of the Performance Period, and the Grantee shall not be permitted, directly or indirectly, to designate the time of payment, distribution or transfer or the taxable year in which it is to be made. Provided, that if the Grantee elects pursuant to paragraph 6, below, to defer the

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receipt of all Performance Units, Common Stock and cash for each Performance Unit that becomes earned by and vested in the Grantee pursuant to the Award, the payment, distribution and transfer of such Performance Units, Common Stock and cash shall be deferred and thereafter paid, distributed and transferred by the Corporation to the Grantee at the specified time and in accordance with the method of payment, distribution and transfer that is elected in by the Grantee in accordance with the election provisions set forth therein.

(e)      The Grantee shall not be entitled to vote any shares of Common Stock of the Corporation, or otherwise have any right or interest as a Common Stock shareholder by reason of the Performance Unit Award granted under the Award during the Performance Period, and prior to the actual transfer of Common Stock to the Grantee pursuant to the Award.

(f)       No dividends or any similar amounts shall be payable or paid with respect to Performance Units, Common Stock earned under the Award, or the Award during or for the Performance Period.

(g)      The Grantee shall have no right to receive cash or acquire shares of Common Stock of the Corporation under the Award other than the cash and Common Stock attributable to the Performance Units earned by the Grantee to the extent provided for herein.

(h)      The Common Stock or cash to which the Grantee becomes entitled shall be paid and transferred to the Grantee only upon the determination of the Performance Units earned by the Grantee at the expiration of the Performance Period.  The payment and transfer of such Common Stock or cash to the Grantee shall be made as soon as reasonably practicable after the expiration of the Performance Period, as determined and directed by the Committee, in its sole discretion.

(i)       The Performance Units or any Common Stock or cash to be paid or transferred to Grantee pursuant to the Award may not be sold, assigned, transferred, pledged, encumbered or otherwise disposed of by Grantee or any other person except as provided in the Award and the Plan until the expiration of the Performance Period and payment and transfer of Common Stock or cash pursuant to the Agreement and Plan.

(j)       The Grantee shall become entitled to receive Performance Units earned, and shall become owner of the shares of Common Stock or cash paid and transferred to the Grantee pursuant to the Award free and clear of all terms, conditions and restrictions imposed by the Award if the Grantee’s employment by the Corporation does not terminate during the Performance Period; provided, that the Grantee shall become entitled to a prorated amount of Performance Units and the terms and conditions imposed by the Award shall partially cease to apply in certain events to the extent described in paragraph 7(d), below.

(k)      If the Grantee’s employment with the Corporation (or a division or Subsidiary thereof) terminates prior to the end of the Performance Period other than by reason of Retirement, Total Disability or death, the Grantee shall forfeit all of the Grantee’s right, title or interest in the Performance Units; and the Grantee shall forfeit such right, title and interest in the Performance Units regardless of the reason for such termination of employment.  Any such termination of employment of the Grantee described in the preceding sentence shall not be

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deemed to occur by reason of transfer of employment of the Grantee by or between the Corporation and any division or Subsidiary of the Corporation.  Upon a forfeiture the Performance Units forfeited shall be cancelled for all purposes.

6.Deferral of Payment, Distribution and Transfer of Stock.

(a)           The Grantee may irrevocably elect to defer the time of  payment, distribution and transfer of Performance Units , Common Stock and cash that the Grantee becomes entitled to receive under this Agreement and Award from the end of the Performance Period generally provided for in paragraph 5, above, to a specified time by filing with the Committee, on or before the deferral election date (hereinafter referred to as "Election Date") described in paragraph 6(b), below, a signed written irrevocable election (hereinafter referred to as "Election") which shall be in the form substantially the same as attached hereto as Exhibit D, or as otherwise prescribed by the Committee.

(b)           An Election of the Grantee to defer the payment, distribution and transfer of Performance Units, Common Stock and cash that the Grantee becomes entitled to receive under this Agreement and Award shall be filed by the Grantee with the Committee on or before the Election Date, which shall be August 15, 2014, the date that is six (6) months before the end of the Performance Period, provided that the Grantee performs services for the Corporation continuously from the later of the beginning of the Performance Period or the date the performance criteria are established through the date the Election is made under this paragraph 6(b), and provided, further, that in no event may the Grantee make an Election to defer the payment, distribution and transfer of Performance Units, Common Stock or cash after such compensation has become readily ascertainable; and in this regard for purposes of this paragraph 6(b), if the amount of Performance Units, Common Stock and cash, or other compensation, as performance-based compensation, is a specified or calculable amount, then it shall be considered compensation that is readily ascertainable if and when the amount is first substantially certain to be paid, distributed and transferred to the Grantee. If the amount of Performance Units, Common Stock and cash, or other compensation, is performance-based compensation that is not a specified or calculable amount because, for example, the amount may vary based upon the level of performance, such compensation, or any portion of the compensation, shall be considered readily ascertainable when the amount is first both calculable and substantially certain to be paid. For this purpose, such performance-based compensation is to be bifurcated between the portion that is readily ascertainable and the amount that is not readily ascertainable, and, in general, any minimum amount that is both calculable and substantially certain to be paid shall be treated as readily ascertainable.

(c)           A Grantee that makes an Election to defer payment, distribution and transfer of Performance Units, Common Stock and cash that the Grantee becomes entitled to receive under this Agreement and Award may irrevocably elect to have payment, distribution and transfer made to the Grantee at a Specified Time, that shall be either (i) the later of (A) the date of the Grantee's separation from service with the Corporation, or (B) a specified calendar date, or (ii) the date of the Grantee's separation from service with the Corporation; and may elect to have payment made in a specified form of payment that shall be either (i) a single lump sum payment, distribution and transfer, or (ii) a payment, distribution and transfer in two, three, four

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or five equal annual installments commencing at the Specified Time elected by the Grantee hereunder and thereafter on each anniversary thereof, until fully paid, transferred and distributed.

(d)           The Award shall be subject to such other rules and requirements as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof and the restrictions made applicable to the Grantee and the Performance Units during the Performance Period.  This instrument and the rights and obligations of the parties involved, shall be subject to interpretation and construction by the Committee to the same extent and with the same effect as the Committee actions under pertinent provisions of the Plan.  The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee in connection with such restrictions and in furtherance hereof.  The Grantee agrees to pay to the Corporation any applicable federal, state, or local income, employment, social security, Medicare, or other withholding tax obligation arising in connection with the grant of the Award to the Grantee; and the Corporation shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the Common Stock that would otherwise be transferred and delivered to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value (as defined in the Plan) on the date of such withholding. The Grantee, with the consent of the Corporation, may satisfy such withholding tax by delivery and transfer to the Corporation of shares of Common Stock previously owned by the Grantee, with any shares so delivered and transferred to be valued at the Fair Market Value on the date of such delivery.

(e)           The provisions of this instrument providing for the deferral of payment, distribution, transfer or issuance of Performance Units, Common Stock or cash shall be applicable solely and exclusively to the Grantee and the Award Agreement and Award referred to herein, and shall not apply to any other stock incentive or other grant, award or transfer provided for or made under the Plan.

(f)           Notwithstanding anything otherwise provided under the Plan or in the Award Agreement and Award, the following requirements shall apply to this Award Agreement and the Award, to all elections or subsequent elections made by the Grantee, and to all distributions and payments made to the Grantee pursuant to this Award Agreement and Award:

(1)           Any compensation for services performed by the Grantee during a taxable year may be deferred at the Grantee's election or the Corporation's election or determination only if the election to defer such compensation is made not later than the close of the preceding taxable year or such other time as provided in Treasury Regulations under section 409A of the Internal Revenue Code of 1986, as amended ("Code"), but in all events any deferral of the payment, distribution, transfer or issuance of Performance Units, Common Stock or cash pursuant to the Award and Award Agreement may be made only by an election that is made on or before the Election Date.

(2)           Any compensation deferred under the Plan shall not be distributed earlier than

(i)           Separation from Service of the Grantee,

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(ii)           the date the Grantee becomes Disabled,

(iii)           death of the Grantee,

                (iii)           a Specified Time (or pursuant to a Fixed Schedule) specified under the plan under which the compensation is deferred at the date of deferral of such compensation,

(v)            a Change in Ownership or Control, or

(vi)           the occurrence of an Unforeseeable Emergency.

(3)           If the Grantee is a Specified Employee, no payment or distribution shall be made before the date which is six (6) months after the date of the Grantee's Separation from Service, or, if earlier, the date of death of the Grantee.

(4)           No acceleration of the time or schedule of any distribution or payment under the plan under which compensation is deferred shall be permitted or allowed, except to the extent provided in Treasury Regulations issued under Code section 409A.

(5)           This instrument shall not permit a subsequent election unless authorized and agreed upon in writing by the Corporation and Grantee, and if the Plan or this instrument permits under any subsequent election by the Grantee a delay in a payment or a change in the form of payment of compensation deferred under this Award Agreement and Award, such subsequent election shall not take effect until at least twelve (12) months after the date on which it is made.  In the case of a subsequent election related to a payment to be made upon Separation from Service of the Grantee, at a Specified Time or pursuant to a Fixed Schedule, or upon a Change in Ownership or Control, the first payment with respect to which such subsequent election is made shall be deferred for a period of not less than five (5) years from the date such payment would otherwise have been made; and any such subsequent election related to a payment at a Specified Time or pursuant to a Fixed Schedule may not be made less than twelve (12) months prior to the date of the first scheduled payment to which it relates.

(6)           For purposes of the Plan and this instrument and the Award, the following terms and definitions shall apply with respect to deferral of compensation and the time of payment of any deferred compensation:

(i)           "Change of Ownership or Control" means to the extent provided by Treasury Regulations issued under Code Section 409A, a change in the ownership or effective control of the Corporation, or in the ownership of a substantial portion of the assets of the Corporation, which shall be if (i) a Person acquires more than 50% of the  Corporation’s stock; (ii) a Person acquires during a 12-month period at least 30% (or a higher percentage specified under the Plan) of the Corporation’s stock; (iii) a majority of the members of the Board of Directors of the Corporation are replaced during a 12-month period; or (iv) a  Person acquires during a 12-month period at least 40% of the gross fair market value of the Corporation’s assets.

(ii)             "Disabled" means that an individual (i) is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental

6

impairment which can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, or (ii)  is, by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, receiving income replacement benefits for a period of not less than 3 months under an accident and health plan covering employees of the individual's employer.

(iii)           "Fixed Schedule" means the distribution or payment of compensation deferred under this instrument and Award in a fixed schedule of distributions or payments that are determined and fixed at the time the deferral of such compensation is first elected by the Grantee or the Corporation.

(iv)           "Specified Employee" means a key employee (as defined in Code section 416(i) without regard to paragraph (5) thereof) of the Corporation.

(v)           "Specified Time" means a specified date at which deferred compensation deferred by or for the Grantee pursuant to this instrument and Award is required to be distributed or paid and which is specified at the time of the election of deferral of such deferred compensation

(vi)           “Unforeseeable Emergency” means a severe financial hardship to the participant resulting from an illness or accident of the participant, the participant's spouse, or a dependent (as defined in Code section 152(a)) of the participant, loss of the participant's property due to casualty, or other similar extraordinary and unforeseeable circumstances arising as a result of events beyond the control of the participant. As determined under Treasury Regulations under Code section 409A, the amounts distributed with respect to an emergency shall not exceed the amounts necessary to satisfy such emergency plus amounts necessary to pay taxes reasonably anticipated as a result of the distribution, after taking into account the extent to which such hardship is or may be relieved through reimbursement or compensation by insurance or otherwise or by liquidation of the participant's assets (to the extent the liquidation of such assets would not itself cause severe financial hardship)."

7.Transferability of Performance Units; Termination of Employment.

(a)           Except as provided in subparagraph (b) of this paragraph 7, below, the Award, the Grantee’s rights and obligations hereunder and the Performance Units granted hereunder shall not be transferable by the Grantee otherwise than by will or the laws of descent and distribution which apply to the Grantee’s estate.

(b)           Notwithstanding the foregoing, the Grantee may transfer any part or all of the Grantee’s rights in and to the Performance Units to members of the Grantee’s immediate family, or to one or more trusts for the benefit of such immediate family members, or partnerships in which such immediate family members are the only partners if the Grantee does not receive any consideration for the transfer.  In the event of any such transfer, Performance Units shall continue to be subject to the same terms and conditions otherwise applicable hereunder and under the Plan immediately prior to its transfer, except that this stock shall not be further transferable by the transferee inter vivos, except for transfer back to the original Grantee. 

7

For any such transfer to be effective, the Grantee must provide prior written notice thereof to the Committee, unless otherwise authorized and approved by the Committee, in its sole discretion; and the Grantee shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer.  For purposes of transfer of this grant under this subparagraph (b), “immediate family” shall mean the Grantee’s spouse, children and grandchildren.

(c)           Notwithstanding anything to the contrary expressed or implied herein (including without limitation, the restrictions stated in paragraph 5, above, applicable to the Performance Units), all rights and interest of the Grantee in the Performance Units shall become invalid and wholly terminated and forfeited upon the termination of the Grantee’s employment with the Corporation (or a division or Subsidiary), during the Performance Period other than a termination by reason of Retirement, Total Disability or death of the Grantee.

(d)           Notwithstanding the foregoing provisions, in the event of termination of the Grantee’s employment with the Corporation (or a division or Subsidiary) during the Performance Period by reason of (i) the Retirement of the Grantee, (ii) the Total Disability of the Grantee, or (iii) the Grantee’s death while still employed by the Corporation (or a division or Subsidiary), then an adjusted and prorated entitlement to Performance Units shall be allowed as provided in this paragraph 7(d). The Grantee shall become vested in and entitled to receive, in the event of any such Retirement or Total Disability, and the legatees, designated Beneficiary, or personal representatives or heirs of the Grantee shall be vested in and entitled to receive, in the event of the Grantee’s death, a prorated award of Performance Units earned in the Performance Period following such Retirement, Total Disability or death.  The award shall be a prorated amount of Performance Units equal to the total of Performance Units earned under the Award at the end of the Performance Period for the Grantee, multiplied by a fraction of which the numerator shall be the number of full months which have elapsed under the Performance Period at the time of such termination of employment by reason of Retirement, Total Disability or death, and the denominator of which shall be the total number of months in the Performance Period. The Grantee, legatees, designated Beneficiary, or personal representatives or heirs of the Grantee, as the case may be, shall become entitled to receive such prorated award at the expiration of the Performance Period and following application of the performance criteria as provided in the Award and determined by the Committee.

The prorated award of Performance Units earned in the Performance Period to which the Grantee or the legatees, a designated Beneficiary, or the personal representative or heirs of the Grantee shall become vested in and entitled to receive under the foregoing provisions in event of Retirement, Total Disability or death of the Grantee, is to be qualified performance-based compensation paid solely on account of attainment of the Performance Goal,  as provided for in Treas. Reg. §1.162-27(e)(2)(i).  The Retirement, Total Disability or death of the Grantee during the Performance Period in and of itself alone shall in no case vest the Grantee in Performance Units or any part of thereof. A prorated vesting and entitlement to Performance Units or a part thereof, hereunder by reason of such events shall in all cases remain subject to and dependent solely upon the attainment of the Performance Goal as provided herein.

(e)           The Grantee may designate a Beneficiary to receive any rights of the Grantee which may become vested in the event of the death of the Grantee under procedures and

8

in the form established by the Committee; and in the absence of such designation of a Beneficiary, any such rights shall be deemed to be transferred to the estate of the Grantee.

(f)           For purposes of the Award and this instrument, "Retirement" shall mean a voluntary termination of employment of the Grantee with the Corporation and/or a division or subsidiary thereof by the Grantee if at the time of such termination of employment the Grantee has both completed five (5) years of service with the Corporation and/or a division or subsidiary thereof and attained age fifty (50), and “voluntary termination” shall mean that the Grantee had an opportunity to continue employment with the Corporation and/or a division or subsidiary thereof, but did not do so; and except as provide for in paragraph 6 with respect to deferred compensation payments, “Total Disability” shall mean that the Grantee is permanently and totally disabled and unable to engage in any substantial gainful activity by reason of a medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than twelve (12) months, and has established such disability to the extent and in the manner and form as may be required under the provisions of Section 22(e) of the Internal Revenue Code of 1986, as amended (or corresponding section of any future federal tax code), and regulations thereunder.

8.Administration of Performance Unit Award.  The grant of the Award shall be subject to such other rules and requirements as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof and the terms and conditions made applicable to the Grantee and the Performance Units during the Performance Period.  The Award, this instrument, and the rights and obligations of the parties thereto shall be subject to interpretation and construction by the Committee to the same extent and with the same effect as the Committee actions under pertinent provisions of the Plan.  The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee in connection with such restrictions and in furtherance hereof.  The Grantee agrees to pay to the Corporation any applicable federal, state, or local income, employment, social security, Medicare, or other withholding tax obligation arising in connection with the grant of the Award to the Grantee; and the Corporation shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the shares of Common Stock or cash that would otherwise be paid and transferred to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value (as defined in the Plan) on the date of such withholding. The Grantee, with the consent of the Corporation, may satisfy such withholding tax by delivery and transfer to the Corporation of shares of Common Stock previously owned by the Grantee, with any shares so delivered and transferred to be valued at the Fair Market Value on the date of such delivery.

9.Adjustment Provisions.  It is understood that, prior to the expiration of the Performance Period certain changes in capitalization of the Corporation may occur.  It is, therefore, understood and agreed with respect to changes in capitalization that:

(a)          If a stock dividend is declared on the Common Stock of the Corporation, there shall be added to the number of Performance Units provided for under the Award and stated in paragraph 1 of this instrument, the number of Performance Units equal to the number of Performance Units which would have been granted to the Grantee had the Grantee been the fully vested and unrestricted owner of the number of Performance Units then provided for under the

9

Award granted, but not theretofore received without restriction; provided, however, that the additional Performance Units shall be subject to all terms and provisions of this instrument (including, without limitation, the terms and conditions stated in paragraph 5, above), and in making such adjustments, no fractional units, shares, or scrip certificates in lieu thereof, shall be granted or issuable by the Corporation, and the Grantee shall be entitled to only the number of full Performance Units to which the Grantee may be entitled by reason of such adjustment at the adjusted grant.

(b)     In the event of an increase in the outstanding shares of Common Stock of the Corporation, effectuated for the purpose of acquiring properties or securities of another corporation or business enterprise, there shall be no increase in the number of Performance Units which are the subject matter of the Award under this instrument as a result of such acquisition.

(c)     In the event of an increase or decrease in the number of outstanding shares of Common Stock of the Corporation through recapitalization, reclassification, stock split-ups, consolidation of shares, changes in par value and the like, an appropriate adjustment shall be made in the number of Performance Units provided for under the Award and stated in Section 1 of this instrument, by increasing or decreasing the number of Performance Units, as may be required to enable the Grantee to acquire the same proportionate stockholdings as the grant of the Award would originally have provided.  Provided, however, that any additional Performance Units shall be subject to all terms and provisions of this instrument (including, without limitation, the restrictions stated in paragraph 5, above), and that in making such adjustments, no fractional Performance Units shall be awarded, and the Grantee shall be entitled to receive only the number of full Performance Units to which the Grantee may be entitled by reason of such adjustment.

(d)      Except as otherwise provided for with respect to the payment of any deferred compensation in paragraph 6, above,  to the extent Performance Units are still not vested in Grantee at the time of a Change in Control with respect to the Corporation, then pursuant to the provisions of the Plan, they shall become fully vested and completely free and clear of any conditions or restrictions stated herein at that time; provided, that if such Change in Control occurs less than six (6) months after the date of the grant of the Award hereunder to the Grantee, then Performance Units shall become fully vested and completely free and clear of any conditions or restrictions stated herein at the time of such Change in Control only if the Grantee agrees in writing, if requested by the Corporation in writing, to remain in the employ of the Corporation or a division or subsidiary of the Corporation at least through the date which is six (6) months after the date the grant was made with substantially the same title, duties, authority, reporting relationships, and compensation as on the day immediately preceding the Change in Control.  The provisions of this subparagraph (d) shall be applied in addition to, and shall not reduce, modify, or change any other obligation or right of the Grantee otherwise provided for in paragraph 3, above, concerning the Grantee’s continued employment with the Corporation or the termination thereof.  If the Performance Units become subject to this subparagraph (d), they shall become fully vested in the Grantee and nonforfeitable.  The Performance Units are subject to the provisions of the Plan authorizing the Corporation, or a committee of its Board of Directors, to provide in advance or at the time of a Change in Control for cash to be paid in actual settlement of the shares of Common Stock for earned Performance Units, all subject to such terms and

10

conditions as the Corporation or the Committee, in its sole discretion, may determine and impose.  For purposes of this subparagraph (d), the term “Change in Control” shall have the same meaning as provided in the definition of that term stated in the Plan, including any amendments thereof which may be made from time to time in the future pursuant to the provisions of the Plan, with any amended definition of such term to apply to all events thereafter coming within the amended meaning.

10.Required Grantee Repayment/Reduction Provision.  Notwithstanding anything in the  Plan, the Award or this instrument to the contrary, all or a portion of the Award made to the Grantee  under this instrument  is subject to being called for repayment to the Corporation or reduced in any situation where the Board of Directors of the Corporation or a Committee thereof determines that fraud, negligence, or intentional misconduct by the Grantee  was a contributing factor to the Corporation having to restate all or a portion of its financial statement(s). The Committee may determine whether the Corporation  shall effect any such repayment or reduction : (i) by seeking repayment from the Grantee , (ii) by reducing (subject to applicable law and the terms and conditions of the Plan or any other applicable plan, program, or arrangement) the amount that would otherwise be awarded or payable to the Grantee  under the Award, the Plan or any other compensatory plan, program, or arrangement maintained by the Corporation , (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Corporation's  otherwise applicable compensation practices, or (iv) by any combination of the foregoing. The determination regarding the Grantee’s conduct, and repayment or reduction under this provision shall be within the sole discretion of the Committee and shall be final and binding on the Grantee and the Corporation. The Grantee, in consideration of the grant of the Award, and by the Grantee's execution of this instrument, acknowledges the Grantee's understanding of and agreement to this provision, and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the event of a call for repayment or other action by the Corporation or Committee to effect its terms with respect to the Grantee, the Award and/or any other compensation described herein.

11.Stock Reserved.  The Corporation shall at all times during the term of the Award reserve and keep available such number of shares of its Common Stock as will be sufficient to satisfy the Award issued and granted to Grantee and the requirements thereof as evidenced by this instrument, and shall pay all original issue taxes, if any, on the transfer of Common Stock to the Grantee, and all other fees and expenses necessarily incurred by the Corporation in connection therewith.

12.Rights of Shareholder.  Except as otherwise provided in the Award and this instrument, the Grantee shall have no rights as a shareholder of the Corporation in respect of the Performance Units or Common Stock for which the Award is granted; and the Grantee shall not be considered or treated as a record owner of shares with respect to the Common Stock until the Performance Units are fully vested and no longer subject to any of the conditions, performance requirements, or restrictions imposed under the Award, and Common Stock is actually issued and transferred to the Grantee.

13.Entire Agreement.  This instrument contains the entire terms of the Award, and may not be changed orally or other than by a written instrument issued and approved by the

11

Corporation pursuant to the Plan.  This instrument supersedes any agreements or understandings that may previously have existed, and there are no other agreements or understandings, relating to its subject matter.

14.Successors and Assigns.  The Award shall inure to the benefit of and be binding upon the heirs, legatees, legal representatives, successors, and assigns of the parties thereto.

The Grantee hereby acknowledges receipt of this instrument, the Notice of Performance Unit Award and a copy of the Plan, and accepts the Award under the terms and conditions stated in this instrument, subject to all terms and provisions of the Plan, by signing this instrument in duplicate originals, as of the date first above written.

Date	«Officer_Name»
	Grantee

12

Exhibit A

Performance Units Criteria

2012-2015 Performance Period

Total Stockholder Return (TSR):vs. ONEOK Peer Group
ONEOK TSR Ranking vs. ONEOK Peer Group	Percentage of Performance Units Earned
90th percentile and above 75th percentile 50th percentile 25th percentile Below 25th percentile	200% 150% 100% 50% 0%

IF ONEOK’s TSR ranking at the end of the performance period is between the stated percentile levels in the above table, the percentage of the performance units earned will be interpolated between the earning levels.  No Performance Units are earned if ONEOK’s TSR ranking at the end of the performance period is below the 25th percentile

Exhibit B

Illustration of Hypothetical 2012-2015 Performance Period

Performance Unit Award Calculation

Illustration assumes 1,000 Performance Units Granted in February 2012

Total Stockholder Return (TSR) vs. ONEOK Peer Group

Hypothetical 2012-2015 ONEOK TSR Ranking = 40th percentile

A 40th percentile TSR ranking earns 80% of Performance Units granted (i.e., 1,000 units)

as interpolated between 50% and 100% from Table A (see chart below)

800 units earned

Total Performance Units Earned

TR 800 Performance Units

800 performance units earned out of 1,000 units granted = 80.0% “earn-out” [80% (1,000 shares) paid and distributed in the form of Common Stock as provided in section 5.c.]

Exhibit C
ONEOK PEER GROUP – 2012
Company Name	Sym
AGL Resources Inc.	GAS
ATMOS Energy	ATO
CenterPoint Energy Inc.	CNP
Enbridge Inc.	ENB
Energy Transfer Partners LP	ETP
Enterprise Products Partners LP	EPD
EQT Corporation	EQT
Integrys Energy Group Inc.	TEG
Kinder Morgan Energy LP	KMP
MDU Resources Corp	MDU
Magellan Midstream Partners LP	MMP
MarkWest Energy Partners LP	MWE
National Fuel Gas Company	NFG
NiSource Inc.	NI
OGE Energy Corp	OGE
ONEOK, Inc.	OKE
Questar Corp	STR
SEMPRA Energy	SRE
Spectra Energy Corporation	SE
Targa Resources Corp	TRGP
TransCanada Corporation	TRP
Williams Companies Inc.	WMB

Exhibit D

ONEOK, INC. EQUITY COMPENSATION PLAN

PERFORMANCE UNIT AWARD AGREEMENT

DEFERRAL ELECTION

This Election is made by the undersigned Grantee pursuant to that certain Performance Unit Award granted to me under the ONEOK, Inc. Equity Compensation Plan, on the 15th day of February 2012, a copy of which is attached hereto (the "Award").

This Election is made on or before the date of August 15, 2014, which is six (6) months before the end of the Performance Period on February 15, 2015.

I hereby irrevocably elect to defer the payment, distribution and transfer and my receipt of all Performance Units, Common Stock and cash that I may earn and become entitled to receive from the regularly scheduled time of payment, distribution and transfer provided for in Section 5(d) of the Award, until a later date as follows:

A.           Election of Specified Time of Payment (Initial one election of time of payment)

___           I elect to have all Common Stock, cash or other compensation which I earn or become entitled to receive under the Award and Award Agreement deferred and paid, distributed, transferred and issued to me on the later of (i) the date of my separation from service as an employee of the Corporation, or (ii) _________________, 20__ in the form specified below.

___           I elect to have all Common Stock, cash or other compensation which I earn or become entitled to receive under the Award and Award Agreement deferred and paid, distributed, transferred and issued to me on the date of my separation from service as an employee of the Corporation.

B.           Election of Form of Payment (Initial one election of form of payment)

___           I elect to receive payment, transfer and distribution of all Common Stock, cash or other compensation which I earn or become entitled to receive under the Award or Award Agreement in a single lump sum payment.

____         I elect to receive payment, transfer and distribution of all Common Stock, cash or other compensation which I earn or become entitled to receive under the Award or Award Agreement in ______(specify 2, 3, 4 or 5) equal annual installments commencing on the specified date of payment elected above, and thereafter on each anniversary thereof until fully paid and transferred. The number of shares of Common Stock or cash received in each installment will equal the number and amount that have not been settled, paid, transferred and distributed (as of the date immediately preceding the installment payment date) divided by the number of installments remaining to be paid (as of the date immediately preceding the installment payment date) rounded down to the next whole number except that the final installment shall be rounded up to the next whole number.

C.            Election for Death Prior to Specified Time of Payment   (Put initials by your choice)

___           In the event of my death prior to the Specified Time of Payment that I have elected above, I elect to have my named beneficiaries receive payment and transfer of the Common Stock, cash or other deferred compensation in a single lump sum within 60 days following my death.

___           In the event of my death prior to the Specified Time of Payment that I have elected above, I elect to have my named beneficiaries receive payment and transfer of the Common Stock, cash or other deferred compensation be paid and transferred in ______ (specify 2, 3, 4 or 5) equal annual installments commencing within 60 days following my death, and thereafter on each anniversary of the commencement date until fully paid and transferred. The number of shares of Common Stock or cash received in each installment will equal the number and amount that have not been paid (as of the date immediately preceding the installment payment date) divided by the number of installments remaining to be paid (as of the date immediately preceding the installment payment date) rounded down to the next whole number except that the final installment shall be rounded up to the next whole number.

D.           Election for Death After Specified Time of Payment (Put initials by your choice)

___           In the event of my death after the Specified Time of Payment elected above, I elect to have my named beneficiaries receive payment and transfer of the Common Stock, cash or other deferred compensation in a single lump sum within 60 days following my death.

___           In the event of my death after the Specified Time of Payment that I have elected above, I elect to have my named beneficiaries receive payment of any remaining Common Stock, cash or other compensation in accordance with the installment schedule elected above.

E.            Designation of Beneficiary (List each beneficiary and percentage)

I designate the following individuals (entities) as my beneficiaries to receive the following share(s) of my Common Stock, cash or other deferred compensation, as indicated below:

Name of Beneficiary	Percent
	100% (total must equal 100%)

F.           Change in Ownership or Control

Notwithstanding the foregoing, immediately following a Change in Ownership or Control the Common Stock, cash or other deferred compensation that have not been paid and transferred will be paid and transferred.  In the event shares of Common Stock no longer exist at the time of payment and transfer, each of the deferred Performance Units shall be converted in a manner that is consistent with the manner in which shareholders of Common Stock were treated with respect to the Change in Ownership or Control.

Solely for purposes of this election, a “Change in Ownership or Control” shall mean and shall have occurred if one of the following has occurred: A person acquires more than 50% (or a higher percentage specified under the Plan) of the Corporation’s stock;  a person acquires during a 12-month period at least 30% (or a higher percentage specified under the Plan) of the Corporation’s stock; a majority (or a higher percentage specified under the Plan) of the members of the Board of Directors of the Corporation are replaced during a 12-month period; or a person acquires during a 12-month period at least 40% (or a higher percentage specified under the Plan) of the gross fair market value of the Corporation’s assets.

 Made and executed by me as Grantee of the Award pursuant to the terms and provisions of Section 6

thereof, on this _______day of ______________, 20___.

_____________________________________

Grantee

 Received this ____day of ____________, 20___,

______________________________________

For the Committee

EX-12

Exhibit 12

ONEOK, Inc.

Computation of Ratio of Earnings to Fixed Charges

	Years Ended December 31,
(Unaudited)	2011			2010			2009			2008			2007
	(Thousands of dollars)
Fixed Charges, as defined
Interest on long-term debt	$	305,523		$	287,910		$	292,768		$	254,765		$	249,925
Other interest		8,374			4,594			20,411			44,858			16,115
Amortization of debt discount, premium    and expense		7,070			4,623			4,597			4,421			5,710
Interest on lease agreements		1,515			19,289			20,221			29,524			37,448
Total Fixed Charges		322,482			316,416			337,997			333,568			309,198
Earnings before income taxes and undistributed    income of equity method investees		970,746			745,354			718,656			771,239			681,169
Earnings available for fixed charges	$	1,293,228		$	1,061,770		$	1,056,653		$	1,104,807		$	990,367
Ratio of earnings to fixed charges		4.01	x		3.36	x		3.13	x		3.31	x		3.20	x

For purposes of computing the ratio of earnings to fixed charges, "earnings" consists of pre-tax income from continuing operations before adjustment for income or loss from equity investees plus fixed charges and distributed income of equity investees, less interest capitalized. "Fixed charges" consists of interest charges, the amortization of debt discounts and issue costs and the representative interest portion of operating leases.

EX-21

Exhibit 21

ONEOK, Inc.

SUBSIDIARIES OF THE COMPANY

Divisions

Oklahoma Natural Gas Company, a division of ONEOK, Inc.

Kansas Gas Service Company, a division of ONEOK, Inc.

Texas Gas Service Company, a division of ONEOK, Inc.

	State of
	Incorporation
Subsidiaries	or Organization
Kansas Gas Marketing Company	Kansas
ONEOK Partners GP, L.L.C.	Delaware
NBP Services, LLC	Delaware
ONEOK Energy Services Canada, Ltd.	Canada
ONEOK Energy Services Company, II	Delaware
ONEOK Energy Services Company, L.P.	Texas
ONEOK Energy Services Holdings, L.L.C.	Oklahoma
ONEOK Kansas Company	Kansas
ONEOK Kansas Properties, L.L.C.	Kansas
ONEOK Leasing Company	Delaware
ONEOK Parking Company, L.L.C.	Delaware
ONEOK Services Company	Oklahoma
ONEOK Texas Resources, Inc.	Delaware
ONEOK Partners, L.P.	Delaware

1 

ONEOK Partners, L.P.

Subsidiaries of ONEOK Partners, L.P.
ONEOK Partners Intermediate Limited Partnership	Delaware
ONEOK ILP GP, L.L.C.	Delaware
ONEOK Rockies Investments, LLC	Delaware
ONEOK Rockies Midstream, LLC	Delaware
ONEOK Rockies Company (Canada), Ltd.	Alberta
ONEOK Rockies Enterprises, LLC	Delaware
Border Minnesota Pipeline, LLC	Delaware
Black Mesa Holdings, Inc.	Delaware
Black Mesa Pipeline, Inc.	Delaware
Black Mesa Pipeline Operations, L.L.C.	Delaware
Black Mesa Technologies, Inc.	Oklahoma
Border Midstream Services, Ltd.	Alberta
Border Midwestern Company	Delaware
Midwestern Gas Transmission Company	Delaware
Border Viking Company	Delaware
Viking Gas Transmission Company	Delaware
Crestone Energy Ventures, L.L.C.	Delaware
Crestone Bighorn, L.L.C.	Delaware
Crestone Gathering Services, L.L.C.	Delaware
Crestone Powder River, L.L.C.	Delaware
Crestone Wind River, L.L.C.	Delaware
Northern Border Pipeline Company (general partnership)	Texas
Guardian Pipeline, L.L.C.	Delaware
Bighorn Gas Gathering, L.L.C. (joint venture)	Delaware
Fort Union Gas Gathering, L.L.C. (joint venture)	Delaware
Lost Creek Gathering Company, L.L.C. (joint venture)	Delaware
Chisholm Pipeline Company (joint venture)	Delaware
Chisholm Pipeline Holdings, L.L.C.	Delaware
Mid Continent Market Center, L.L.C.	Kansas
OkTex Pipeline Company, L.L.C.	Delaware
ONEOK Arbuckle Pipeline, L.L.C.	Delaware
ONEOK Arbuckle North Pipeline, L.L.C.	Delaware
ONEOK Arbuckle Land Company	Texas
ONEOK Bakken Pipeline, L.L.C.	Delaware
ONEOK Field Services Company, L.L.C.	Oklahoma
ONEOK Gas Gathering, L.L.C.	Oklahoma
ONEOK Gas Storage Holdings, L.L.C.	Delaware
ONEOK Gas Storage, L.L.C.	Oklahoma
ONEOK Gas Transportation, L.L.C.	Oklahoma
ONEOK Hydrocarbon, L.L.C.	Delaware

2

ONEOK Hydrocarbon, L.P.	Delaware
ONEOK Hydrocarbon GP, L.L.C.	Delaware
ONEOK Hydrocarbon Holdings, L.L.C.	Delaware
ONEOK Hydrocarbon Southwest, L.L.C.	Delaware
ONEOK MB I, L.P.	Delaware
ONEOK Midstream Gas Supply, L.L.C.	Oklahoma
ONEOK Mont Belvieu Storage Company, L.L.C.	Delaware
ONEOK NGL Pipeline, L.L.C.	Delaware
ONEOK NGL Gathering, L.L.C.	Delaware
ONEOK North System, L.L.C.	Delaware
ONEOK Overland Pass Holdings, L.L.C.	Oklahoma
ONEOK Pipeline Holdings, L.L.C.	Delaware
ONEOK Sterling III Pipline, L.L.C.	Oklahoma
ONEOK Texas Gas Storage, L.L.C.	Texas
ONEOK Transmission Company, L.L.C.	Delaware
ONEOK Underground Storage Company, L.L.C.	Kansas
ONEOK VESCO Holdings, L.L.C.	Delaware
ONEOK WesTex Transmission, L.L.C.	Delaware
Overland Pass Pipeline Company LLC (joint venture)	Delaware
Potato Hills Gas Gathering System (joint venture)	Oklahoma
Sycamore Gas System (general partnership)	Oklahoma
Venice Energy Services Company, L.L.C.	Delaware
Mont Belvieu I Fractionation Facility (joint venture)	Texas
Heartland Pipeline Company (general partnership)	Texas

3

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-177044 and 333-177048) and Form S-8 (Nos. 333-41263, 333-54274, 333-75768, 333-121769, 333-140629, 333-152748, 333-157584, 333-165044, 333-171308, 333-178622 and 333-130070) of ONEOK, Inc. of our report dated February 21, 2012 relating to the consolidated financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

February 21, 2012

EX-31.1

Exhibit 31.1

Certification

I, John W. Gibson, certify that:

I have reviewed this annual report on Form 10-K of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)   Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)   Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)   Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)   Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a)   All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)   Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 21, 2012

/s/ John W. Gibson                      

John W. Gibson

Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

I, Robert F. Martinovich, certify that:

I have reviewed this annual report on Form 10-K of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)   Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)   Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)   Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)   Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a)   All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)   Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 21, 2012

/s/ Robert F. Martinovich                                 

Robert F. Martinovich

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONEOK, Inc. (the “Registrant”) for the period ending December 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John W. Gibson, Chief Executive Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)         the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)         the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ John W. Gibson                  

John W. Gibson

Chief Executive Officer

February 21, 2012

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONEOK, Inc. (the “Registrant”) for the period ending December 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Robert F. Martinovich, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)         the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)         the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ Robert F. Martinovich                          

Robert F. Martinovich

Chief Financial Officer

February 21, 2012

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

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SHARE-BASED PAYMENTS (Tables)

12 Months Ended

Dec. 31, 2011

SHARE-BASED PAYMENTS [Abstract]

Schedule of stock option activity for employees and non-employee directors

The following table sets forth the stock option activity for employees and nonemployee directors for the periods indicated:

	Number of			Weighted
	Shares			Average Price
Outstanding December 31, 2010		135,190		$	21.52
Exercised		(105,540	)	$	22.78
Outstanding December 31, 2011		29,650		$	17.03
Exercisable December 31, 2011		29,650		$	17.03

Schedule of intrinsic value of stock options outstanding and exercisable by exercise price range

The aggregate intrinsic value in the table below represents the total pre-tax intrinsic value, based on our year-end closing stock price of $86.69, that would have been received by the option holders had all option holders exercised their options as of December 31, 2011:

	Stock Options Outstanding and Exercisable
		Weighted				Aggregate
		Average		Weighted		Intrinsic
Range of	Number	Remaining		Average		Value
Exercise Prices	of Awards	Life (yrs)		Exercise Price		(in 000's)
$16.88 to $25.32	29,650	1.02	$	17.03	$	2,065

Schedule of intrinsic value of options exercised

As of December 31, 2011, all stock options were fully vested and expensed.  The following table sets forth statistics relating to our stock option activity:

	December 31, 2011		December 31, 2010		December 31, 2009
	(Thousands of dollars)
Intrinsic value of options exercised	$	4,756	$	8,953	$	2,453

Schedule of Restricted Stock Unit and Performance Unit Activity

Restricted Stock Unit Activity

As of December 31, 2011, there was $10.5 million of total unrecognized compensation cost related to our nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.13 years.  The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of			Weighted
	Shares			Average Price
Nonvested December 31, 2010		488,786		$	35.07
Granted		205,750		$	57.00
Released to participants		(1,271	)	$	29.26
Forfeited		(8,928	)	$	42.96
Nonvested December 31, 2011		684,337		$	41.57

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	57.00	$	37.33	$	23.47
Fair value of shares granted (thousands of dollars)	$	11,728	$	8,206	$	2,251

Performance Unit Activity

As of December 31, 2011, there was $7.4 million of total unrecognized compensation cost related to the nonvested performance unit awards, which is expected to be recognized over a weighted-average period of 1.09 years.  The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations of the 2011, 2010 and 2009 grants at the grant date:

	Number of			Weighted
	Units			Average Price
Nonvested December 31, 2010		1,314,587		$	40.30
Granted		420,850		$	69.35
Forfeited		(19,276	)	$	46.12
Nonvested December 31,  2011		1,716,161		$	47.36

	2011		2010		2009
Volatility (a)		39.91%		40.60%		43.58%
Dividend Yield		3.30%		4.12%		5.70%
Risk-free Interest Rate		1.33%		1.47%		1.01%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	69.35	$	48.09	$	29.34
Fair value of shares granted (thousands of dollars)	$	29,186	$	20,738	$	17,232

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LONG-TERM DEBT (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2011

Mature Notes [Member]

Dec. 31, 2011

Oneok [Member]

Dec. 31, 2010

Oneok [Member]

Dec. 31, 2011

Oneok [Member]

Notes Payable due 2011 [Member]

Dec. 31, 2010

Oneok [Member]

Notes Payable due 2011 [Member]

Dec. 31, 2011

Oneok [Member]

Notes Payables due 2015 [Member]

Dec. 31, 2010

Oneok [Member]

Notes Payables due 2015 [Member]

Dec. 31, 2011

Oneok [Member]

Notes Payables due 2019 [Member]

Dec. 31, 2010

Oneok [Member]

Notes Payables due 2019 [Member]

Dec. 31, 2011

Oneok [Member]

Note Payables 1 due 2028 [Member]

Dec. 31, 2010

Oneok [Member]

Note Payables 1 due 2028 [Member]

Dec. 31, 2011

Oneok [Member]

Note Payables 2 due 2028 [Member]

Dec. 31, 2010

Oneok [Member]

Note Payables 2 due 2028 [Member]

Dec. 31, 2011

Oneok [Member]

Notes Payables due 2035 [Member]

Dec. 31, 2010

Oneok [Member]

Notes Payables due 2035 [Member]

Dec. 31, 2011

Oneok [Member]

Other Long Term Debt [Member]

Dec. 31, 2010

Oneok [Member]

Other Long Term Debt [Member]

Mar. 31, 2012

Oneok [Member]

Notes Payables due 2022 [Member]

Dec. 31, 2011

Oneok [Member]

Notes Payables due 2022 [Member]

Dec. 31, 2012

Oneok [Member]

Notes Payables due 2022 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payable due 2011 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payable due 2011 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payables due 2019 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payables due 2019 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payables due 2012 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payables due 2012 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payables due 2016 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payables due 2016 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payables due 2036 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payables due 2036 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Notes Payables due 2037 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Notes Payables due 2037 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Note Payable from Public Offering Due 2016 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Note Payable from Public Offering Due 2016 [Member]

Dec. 31, 2011

ONEOK Partners [Member]

Note Payable from Public Offering Due 2041 [Member]

Dec. 31, 2010

ONEOK Partners [Member]

Note Payable from Public Offering Due 2041 [Member]

Dec. 31, 2011

Guardian Pipeline [Member]

Dec. 31, 2011

Guardian Pipeline [Member]

Notes Payables due 2022 [Member]

Dec. 31, 2010

Guardian Pipeline [Member]

Notes Payables due 2022 [Member]

Debt Instrument [Line Items]

Face Amount

$ 400,000,000

$ 400,000,000

$ 400,000,000

$ 400,000,000

$ 100,000,000

$ 100,000,000

$ 100,000,000

$ 100,000,000

$ 100,000,000

$ 100,000,000

$ 400,000,000

$ 400,000,000

$ 225,000,000

$ 225,000,000

$ 500,000,000

$ 500,000,000

$ 350,000,000

$ 350,000,000

$ 450,000,000

$ 450,000,000

$ 600,000,000

$ 600,000,000

$ 600,000,000

$ 600,000,000

$ 650,000,000

$ 650,000,000

$ 650,000,000

$ 650,000,000

Interest Rate (in hundredths)

640.00%

712.50%

712.50%

520.00%

520.00%

640.00%

640.00%

650.00%

650.00%

687.50%

687.50%

600.00%

600.00%

425.00%

710.00%

710.00%

862.50%

862.50%

590.00%

590.00%

615.00%

615.00%

665.00%

665.00%

685.00%

685.00%

325.00%

325.00%

612.50%

612.50%

Average interest rate (in hundredths)

785.00%

Total Long-term notes payable

4,875,512,000

4,303,075,000

989,593,000

1,480,225,000

0

400,000,000

400,000,000

400,000,000

0

90,091,000

87,735,000

87,971,000

100,000,000

100,000,000

400,000,000

400,000,000

1,858,000

2,163,000

0

225,000,000

500,000,000

500,000,000

350,000,000

350,000,000

450,000,000

450,000,000

600,000,000

600,000,000

600,000,000

600,000,000

650,000,000

0

650,000,000

0

85,919,000

97,850,000

Unamortized portion of terminated swaps

28,776,000

33,113,000

Unamortized debt discount

(10,346,000)

(6,410,000)

Current maturities

(364,391,000)

(643,236,000)

Debt instrument call feature

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

Debt instrument, interest rate, stated percentage rate range, minimum (in hundredths)

761.00%

Debt instrument, interest rate, stated percentage rate range, maximum (in hundredths)

827.00%

Debt instrument covenant description

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

Guardian Pipeline’s senior notes contain financial covenants that require the maintenance of a ratio of (i) EBITDAR, as defined in the master shelf agreement to fixed charges (interest expense plus operating lease expense) of not less than 1.5 to 1; and (ii) total indebtedness to EBITDAR of not greater than 4.75 to 1.  Upon any breach of these covenants, all amounts outstanding under the master shelf agreement may become due and payable immediately.

Fixed charges to EBITDAR covenant ratio

6.5 to 1

Indebtedness to EBITDAR covenant ratio

1.8 to 1

2012

364,400,000

3,300,000

350,000,000

11,100,000

2013

10,900,000

3,200,000

0

7,700,000

2014

10,700,000

3,000,000

0

7,700,000

2015

410,700,000

403,000,000

0

7,700,000

2016

1,110,700,000

3,000,000

1,100,000,000

7,700,000

Repayment of notes

400,000,000

400,000,000

225,000,000

Extinguishment of debt amount

90,500,000

Underwritten public offering

700,000,000

1,300,000,000

Net proceeds from public offering

693,900,000

1,280,000,000

Interest rates (in hundredths)

640.00%

712.50%

712.50%

520.00%

520.00%

640.00%

640.00%

650.00%

650.00%

687.50%

687.50%

600.00%

600.00%

425.00%

710.00%

710.00%

862.50%

862.50%

590.00%

590.00%

615.00%

615.00%

665.00%

665.00%

685.00%

685.00%

325.00%

325.00%

612.50%

612.50%

Debt instrument acceleration clause

The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

Master shelf agreement initiation date

November 8, 2001

Maturity date

Apr. 15, 2011

Jun. 15, 2015

Feb. 01, 2019

Sep. 30, 2028

Sep. 30, 2028

Jun. 15, 2035

Jan. 31, 2022

Mar. 15, 2011

Mar. 01, 2019

Apr. 01, 2012

Oct. 01, 2016

Oct. 01, 2036

Oct. 15, 2037

Feb. 01, 2016

Feb. 01, 2041

Sep. 30, 2022

Long-term debt

$ 4,529,551,000

$ 3,686,542,000

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DISCONTINUED OPERATIONS (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
DISCONTINUED OPERATIONS (Tables) [Abstract]
Description and timing of discontinued operations	In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital. The transaction closed on February 1, 2012.
Operating Revenues	$ 313,371,000	$ 351,260,000	$ 305,897,000
Cost of sales and fuel	302,561,000	340,888,000	287,902,000
Net Margin	10,810,000	10,372,000	17,995,000
Operating costs	7,147,000	8,914,000	6,162,000
Depreciation, depletion and amortization	128,000	93,000	68,000
Operating income	3,535,000	1,365,000	11,765,000
Other income (expense), net	(50,000)	21,000	95,000
Income taxes	(1,255,000)	(114,000)	(4,313,000)
Income from discontinued operations, net	2,230,000	1,272,000	7,547,000
Intercompany payables	45,700,000	40,200,000
Assets
Cash and cash equivalents	8,859,000	693,000
Accounts recievable, net	47,967,000	48,834,000
Gas in storage	2,101,000	2,020,000
Energy marketing and risk management assets	15,016,000	7,703,000
Property, plant and equipment, net	145,000	235,000
Other assets	48,000	40,000
Assets of discontinued operations	74,136,000	59,525,000
Liabilities
Accounts payable	11,435,000	3,147,000
Energy marketing and risk management liabilities	629,000	1,053,000
Other liabilities	751,000	8,009,000
Liabilities of discontinued operations	$ 12,815,000	$ 12,209,000

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EQUITY (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
EQUITY [Abstract]
Minimum quarterly cash dividends per share of preferred stock (in dollars per share)													$ 0.50
Common stock authorized and unreserved common stock available for issuance. (in shares)	179.8												179.8
Dividends paid													227,000,000	193,500,000	172,800,000
Dividend paid (in dollars per share)	$ 0.56	$ 0.56	$ 0.52	$ 0.52	$ 0.48	$ 0.46	$ 0.44	$ 0.44	$ 0.42	$ 0.42	$ 0.40	$ 0.40	$ 2.16	$ 1.82	$ 1.64
Dividend declared (in dollars per share)	$ 0.61												$ 2.16	$ 1.82	$ 1.64
Accelerated Share Repurchases authorized amount													750,000,000
Stock Split													Stock Split - On February 15, 2012, our Board of Directors authorized a two-for-one split of our common stock, subject to shareholder approval of a proposal to increase the number of authorized shares of our common stock to 600 million from 300 million. The proposal will be voted on at our 2012 annual meeting of shareholders on May 23, 2012.
Accelerated Share Repurchases price paid	$ 300,000,000												$ 300,000,000
Accelerated Share Repurchases shares settlement													In 2011, we repurchased approximately 4.3 million shares of our common stock for approximately $300 million pursuant to an accelerated stock repurchase agreement.  The 2011 stock repurchase was part of our three-year stock repurchase program to buy up to $750 million of our common stock that was authorized by our Board of Directors in October 2010.

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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2011

QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]

Quarterly financial disclosure

	First		Second		Third			Fourth
Year Ended December 31, 2011	Quarter		Quarter		Quarter			Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,760,600	$	3,444,798	$	3,529,359		$	4,071,037
Net margin (a)	$	629,877	$	518,833	$	532,624		$	699,025
Income from continuing operations (a)	$	198,285	$	134,330	$	161,158		$	263,741
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,061	$	437	$	(278	)	$	1,010
Net income	$	199,346	$	134,767	$	160,880		$	264,751
Net income attributable to ONEOK	$	130,130	$	55,142	$	60,321		$	115,001
Earnings per share total
Basic	$	1.22	$	0.52	$	0.58		$	1.12
Diluted	$	1.19	$	0.51	$	0.57		$	1.09

	First		Second		Third		Fourth
Year Ended December 31, 2010	Quarter		Quarter		Quarter		Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,780,203	$	2,740,689	$	2,877,849	$	3,280,050
Net margin (a)	$	615,099	$	455,558	$	449,504	$	542,009
Income from continuing operations (a)	$	185,232	$	86,146	$	120,005	$	148,675
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,488	$	228	$	296	$	(740	)
Net income	$	186,720	$	86,374	$	120,301	$	147,935
Net income attributable to ONEOK	$	154,539	$	41,724	$	55,295	$	83,074
Earnings per share total
Basic	$	1.46	$	0.39	$	0.52	$	0.78
Diluted	$	1.44	$	0.39	$	0.51	$	0.76
(a) These amounts vary from the amounts previously filed due to the sale of ONEOK Energy Marketing Company
in February 2012. See Note B for additional information on our discontinued operations.

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PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2011

PROPERTY, PLANT AND EQUIPMENT [Abstract]

Components of Property, Plant and Equipment

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful	December 31,			December 31,
	Lives (Years)	2011			2010
		(Thousands of dollars)
Non-Regulated
Gathering pipelines and related equipment	5 to 46	$	1,350,227		$	1,144,753
Processing and fractionation and related equipment	5 to 42		1,294,586			993,100
Storage and related equipment	5 to 54		299,610			263,125
Transmission pipelines and related equipment	15 to 54		182,863			198,373
General plant and other	2 to 42		288,445			297,407
Construction work in process	-		725,944			228,862
Regulated
Natural gas distribution pipelines and related equipment	15 to 80		3,309,876			3,160,197
Storage and related equipment	5 to 54		136,971			133,314
Natural gas transmission pipelines and related equipment	5 to 77		1,771,752			1,717,276
Natural gas liquids transmission pipelines and related equipment	5 to 80		1,436,500			1,351,245
General plant and other	2 to 85		291,642			261,783
Construction work in process	-		89,518			104,386
Property, plant and equipment			11,177,934			9,853,821
Accumulated depreciation and amortization - non-regulated			(811,644	)		(707,535	)
Accumulated depreciation and amortization - regulated			(1,921,957	)		(1,833,338	)
Net property, plant and equipment		$	8,444,333		$	7,312,948

Average Depreciation Rates for Regulated Property

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
Regulated Property	2011	2010	2009
ONEOK Partners	1.9% - 2.2%	1.9% - 2.2%	1.8% - 2.2%
Natural Gas Distribution	2.0% - 2.9%	2.1% - 2.8%	2.6% - 2.7%

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Basic EPS from continuing operations [Abstract]
Net income attributable to ONEOK available for common stock									$ 358,364	$ 333,360	$ 297,904
Weighted Average number of share, basic (in shares)									104,672	106,368	105,362
Per share amount, basic (in dollars per shares)	$ 1.12	$ 0.58	$ 0.52	$ 1.22	$ 0.78	$ 0.52	$ 0.39	$ 1.46	$ 3.42	$ 3.14	$ 2.83
Diluted EPS from continuing operations [Abstract]
Effect of options and other dilutive securities									0	0	0
Effect of options and other dilutive securities, number of shares (in shares)									2,577	1,417	958
Net income attributable to ONEOK available for common stock and common stock equivalents, diluted									$ 358,364	$ 333,360	$ 297,904
Weighted Average number of share, diluted (in shares)									107,249	107,785	106,320
Per Share amount, diluted (in dollars per share)	$ 1.09	$ 0.57	$ 0.51	$ 1.19	$ 0.76	$ 0.51	$ 0.39	$ 1.44	$ 3.34	$ 3.09	$ 2.80
Anti-dilutive shares (in shares)											192,952

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ONEOK PARTNERS

12 Months Ended

Dec. 31, 2011

ONEOK PARTNERS [Abstract]

ONEOK PARTNERS

P.           ONEOK PARTNERS

Unit Split - In July 2011, ONEOK Partners completed a two-for-one split of its common and Class B units, and its Partnership Agreement was amended to adjust the formula for distributing available cash among its general partner and limited partners to reflect the unit split.  As a result, all unit and per-unit amounts contained herein have been adjusted to be presented on a post-split basis.

Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below as of December 31, 2011 and 2010:

General partner interest	2.0%
Limited partner interest (a)	40.8%
Total ownership interest	42.8%
(a) - Represents 11.8 million common units and approximately 73.0 million Class B units, which are convertible, at our option, into common units.

In February 2010, ONEOK Partners completed an underwritten public offering of 11,001,800 common units, including the partial exercise by the underwriters of their over-allotment option, at a public offering price of $30.38 per common unit, generating net proceeds of approximately $322.7 million.  In conjunction with the offering, ONEOK Partners GP contributed $6.8 million in order to maintain its 2-percent general partner interest.  ONEOK Partners used the proceeds from the sale of common units and the general partner contribution to repay borrowings under the ONEOK Partners Credit Agreement and for general partnership purposes. 

We account for the difference between the carrying amount of our investment in ONEOK Partners and the underlying book value arising from issuance of common units by ONEOK Partners as an equity transaction.  If ONEOK Partners issues common units at a price different than our carrying value per unit, we account for the premium or deficiency as an adjustment to paid-in capital.  As a result of ONEOK Partners’ issuance of common units at a premium to our carrying value per unit, we recognized an increase to paid-in capital of $50.7 million for the year ended December 31, 2010.

Cash Distributions - We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights.  Under ONEOK Partners’ partnership agreement, as amended, distributions are made to the partners with respect to each calendar quarter in an amount equal to 100 percent of available cash as defined in ONEOK Partners’ partnership agreement, as amended.  Available cash generally will be distributed 98 percent to limited partners and 2 percent to the general partner.  The general partner’s percentage interest in quarterly distributions is increased after certain specified target levels are met during the quarter.  In July 2011, the partnership agreement was amended to adjust the formula for distributing available cash among the general partner and limited partners to reflect the two-for-one unit split.  Under the incentive distribution provisions, as set forth in ONEOK Partners’ partnership agreement, as amended, the general partner receives:

·   15 percent of amounts distributed in excess of $0.3025 per unit;

·   25 percent of amounts distributed in excess of $0.3575 per unit; and

·   50 percent of amounts distributed in excess of $0.4675 per unit.

The following table shows ONEOK Partners’ distributions paid in the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.325	$	2.230	$	2.165
General partner distributions	$	12,189	$	11,264	$	10,005
Incentive distributions		123,386		103,463		84,657
Distributions to general partner		135,575		114,727		94,662
Limited partner distributions to ONEOK		197,133		189,078		183,567
Limited partner distributions to noncontrolling interest		276,738		259,380		222,024
Total distributions paid	$	609,446	$	563,185	$	500,253

The following table shows ONEOK Partners’ distributions declared for the periods indicated and paid within 45 days of the end of the period:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.365	$	2.250	$	2.175
General partner distributions	$	12,515	$	11,578	$	10,228
Incentive distributions		131,213		108,711		87,734
Distributions to general partner		143,728		120,289		97,962
Limited partner distributions to ONEOK		200,524		190,774		184,415
Limited partner distributions to noncontrolling interest		281,499		267,811		229,030
Total distributions declared	$	625,751	$	578,874	$	511,407

Relationship - We consolidate ONEOK Partners in our consolidated financial statements; however, we are restricted from the assets and cash flows of ONEOK Partners except for the distributions we receive.  Distributions are declared quarterly by ONEOK Partners’ general partner based on the terms of the ONEOK Partners partnership agreement.  See Note R for more information on ONEOK Partners’ results.

Affiliate Transactions - We have certain transactions with ONEOK Partners and its subsidiaries, which comprise our ONEOK Partners segment.

ONEOK Partners sells natural gas from its natural gas gathering and processing operations to our Energy Services segment.  In addition, a portion of ONEOK Partners’ revenues from its natural gas pipelines business is from our Energy Services and Natural Gas Distribution segments, which contract with ONEOK Partners for natural gas transportation and storage services.  ONEOK Partners also purchases natural gas from our Energy Services segment for its natural gas liquids and its natural gas gathering and processing operations.

Previously, ONEOK Partners had a Processing and Services Agreement with us and OBPI, under which it contracted for all of OBPI’s rights, including all of the capacity of the Bushton Plant, reimbursing OBPI for all costs associated with the operation and maintenance of the Bushton Plant and its obligations under equipment leases covering portions of the Bushton Plant.  In April 2011, pursuant to its rights under the Processing and Services Agreement, ONEOK Partners directed OBPI to give notice of intent to exercise the purchase option for the leased equipment pursuant to the terms of the equipment leases.  On June 30, 2011, through a series of transactions, we sold OBPI to ONEOK Partners and OBPI closed the purchase option and terminated the equipment leases.  The total amount paid by ONEOK Partners to complete the transactions was approximately $94.2 million, which included the reimbursement to us of obligations related to the Processing and Services Agreement.

We provide a variety of services to our affiliates, including cash management and financial services, legal and administrative services by our employees and management, insurance and office space leased in our headquarters building and other field locations.  Where costs are incurred specifically on behalf of an affiliate, the costs are billed directly to the affiliate by us.  In other situations, the costs may be allocated to the affiliates through a variety of methods, depending upon the nature of the expenses and the activities of the affiliates.  For example, a service that applies equally to all employees is allocated based upon the number of employees in each affiliate.  However, an expense benefiting the consolidated company but having no direct basis for allocation is allocated by the modified Distrigas method, a method using a combination of ratios that include gross plant and investment, operating income and payroll expense.  It is not practicable to determine what these general overhead costs would be on a stand-alone basis.

The following table shows ONEOK Partners’ transactions with us for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Revenues	$	403,603	$	457,740	$	475,765
Expenses
Cost of sales and fuel	$	48,163	$	53,107	$	46,824
Administrative and general expenses		251,239		207,282		200,002
Total expenses	$	299,402	$	260,389	$	246,826

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Details) (USD $)	12 Months Ended																																																	12 Months Ended																										1 Months Ended	12 Months Ended								12 Months Ended																															12 Months Ended																									12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Financial [Member]	Dec. 31, 2010 Financial [Member]	Dec. 31, 2011 Gas and Electric Utilities [Member]	Dec. 31, 2010 Gas and Electric Utilities [Member]	Dec. 31, 2011 Industrial [Member]	Dec. 31, 2010 Industrial [Member]	Dec. 31, 2011 Oil and Gas [Member]	Dec. 31, 2010 Oil and Gas [Member]	Dec. 31, 2011 Other companies [Member]	Dec. 31, 2010 Other companies [Member]	Dec. 31, 2011 Investment Grade [Member]	Dec. 31, 2010 Investment Grade [Member]	Dec. 31, 2011 Investment Grade [Member] Financial [Member]	Dec. 31, 2010 Investment Grade [Member] Financial [Member]	Dec. 31, 2011 Investment Grade [Member] Gas and Electric Utilities [Member]	Dec. 31, 2010 Investment Grade [Member] Gas and Electric Utilities [Member]	Dec. 31, 2011 Investment Grade [Member] Industrial [Member]	Dec. 31, 2010 Investment Grade [Member] Industrial [Member]	Dec. 31, 2011 Investment Grade [Member] Oil and Gas [Member]	Dec. 31, 2010 Investment Grade [Member] Oil and Gas [Member]	Dec. 31, 2011 Investment Grade [Member] Other companies [Member]	Dec. 31, 2010 Investment Grade [Member] Other companies [Member]	Dec. 31, 2011 Non-Investment Grade [Member]	Dec. 31, 2010 Non-Investment Grade [Member]	Dec. 31, 2011 Non-Investment Grade [Member] Financial [Member]	Dec. 31, 2010 Non-Investment Grade [Member] Financial [Member]	Dec. 31, 2011 Non-Investment Grade [Member] Gas and Electric Utilities [Member]	Dec. 31, 2010 Non-Investment Grade [Member] Gas and Electric Utilities [Member]	Dec. 31, 2011 Non-Investment Grade [Member] Industrial [Member]	Dec. 31, 2010 Non-Investment Grade [Member] Industrial [Member]	Dec. 31, 2011 Non-Investment Grade [Member] Oil and Gas [Member]	Dec. 31, 2010 Non-Investment Grade [Member] Oil and Gas [Member]	Dec. 31, 2011 Non-Investment Grade [Member] Other companies [Member]	Dec. 31, 2010 Non-Investment Grade [Member] Other companies [Member]	Dec. 31, 2011 Not Rated [Member]	Dec. 31, 2010 Not Rated [Member]	Dec. 31, 2011 Not Rated [Member] Financial [Member]	Dec. 31, 2010 Not Rated [Member] Financial [Member]	Dec. 31, 2011 Not Rated [Member] Gas and Electric Utilities [Member]	Dec. 31, 2010 Not Rated [Member] Gas and Electric Utilities [Member]	Dec. 31, 2011 Not Rated [Member] Industrial [Member]	Dec. 31, 2010 Not Rated [Member] Industrial [Member]	Dec. 31, 2011 Not Rated [Member] Oil and Gas [Member]	Dec. 31, 2010 Not Rated [Member] Oil and Gas [Member]	Dec. 31, 2011 Not Rated [Member] Other companies [Member]	Dec. 31, 2010 Not Rated [Member] Other companies [Member]	Dec. 31, 2011 Cash Flow Hedging [Member]	Dec. 31, 2010 Cash Flow Hedging [Member]	Dec. 31, 2009 Cash Flow Hedging [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Purchasor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Purchasor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Sellor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Sellor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Swaps [Member] Purchasor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Swaps [Member] Purchasor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Swaps [Member] Sellor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Natural Gas [Member] Swaps [Member] Sellor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Crude oil and NGLs [Member] Swaps [Member] Purchasor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Crude oil and NGLs [Member] Swaps [Member] Purchasor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Fixed Price [Member] Crude oil and NGLs [Member] Swaps [Member] Sellor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Fixed Price [Member] Crude oil and NGLs [Member] Swaps [Member] Sellor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Interest Rate Contract [Member] Forward Starting Swaps [Member] Purchasor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Contract [Member] Forward Starting Swaps [Member] Purchasor [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Interest Rate Contract [Member] Forward Starting Swaps [Member] Sellor [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Contract [Member] Forward Starting Swaps [Member] Sellor [Member]	Jan. 31, 2012 Cash Flow Hedging [Member] Oneok Inc [Member] Swaps [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Oneok Inc [Member] Forward Starting Swaps [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Oneok Partners [Member] Forward Starting Swaps [Member]	Jan. 31, 2012 Cash Flow Hedging [Member] Notes Payables due 2022 [Member] Forward Starting Swaps [Member]	Dec. 31, 2011 Cash Flow Hedging [Member] Notes Payables due 2022 [Member] Forward Starting Swaps [Member]	Dec. 31, 2011 Fair Value Hedging [Member]	Dec. 31, 2010 Fair Value Hedging [Member]	Dec. 31, 2009 Fair Value Hedging [Member]	Dec. 31, 2011 Fair Value Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Fair Value Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Fair Value Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Fair Value Hedging [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member]	Dec. 31, 2009 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Exchange Futures [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Options [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Options [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Options [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Natural Gas [Member] Options [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Crude oil and NGLs [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Crude oil and NGLs [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Crude oil and NGLs [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Fixed Price [Member] Crude oil and NGLs [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Basis [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Index [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Index [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Purchasor [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Index [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Index [Member] Natural Gas [Member] Forward and Swaps Contracts [Member] Sellor [Member]	Dec. 31, 2011 Designated as Hedging Instrument [Member] Energy Marketing and Risk Managment Assets and Liabilities, Net [Member]	Dec. 31, 2010 Designated as Hedging Instrument [Member] Energy Marketing and Risk Managment Assets and Liabilities, Net [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Commodity Contract [Member] Cash Flow Hedging [Member]	Dec. 31, 2010 Commodity Contract [Member] Cash Flow Hedging [Member]	Dec. 31, 2009 Commodity Contract [Member] Cash Flow Hedging [Member]	Dec. 31, 2011 Commodity Contract [Member] Cash Flow Hedging [Member] Cost of Sales and Fuel [Member]	Dec. 31, 2010 Commodity Contract [Member] Cash Flow Hedging [Member] Cost of Sales and Fuel [Member]	Dec. 31, 2009 Commodity Contract [Member] Cash Flow Hedging [Member] Cost of Sales and Fuel [Member]	Dec. 31, 2011 Commodity Contract [Member] Cash Flow Hedging [Member] Revenues [Member]	Dec. 31, 2010 Commodity Contract [Member] Cash Flow Hedging [Member] Revenues [Member]	Dec. 31, 2009 Commodity Contract [Member] Cash Flow Hedging [Member] Revenues [Member]	Dec. 31, 2011 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Cost of Sales and Fuel [Member] Non-trading [Member]	Dec. 31, 2010 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Cost of Sales and Fuel [Member] Non-trading [Member]	Dec. 31, 2009 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Cost of Sales and Fuel [Member] Non-trading [Member]	Dec. 31, 2011 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member] Trading [Member]	Dec. 31, 2010 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member] Trading [Member]	Dec. 31, 2009 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member] Trading [Member]	Dec. 31, 2011 Commodity Contract [Member] Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member]	Dec. 31, 2010 Commodity Contract [Member] Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member]	Dec. 31, 2011 Commodity Contract [Member] Designated as Hedging Instrument [Member] Physical Derivative Instrument [Member]	Dec. 31, 2010 Commodity Contract [Member] Designated as Hedging Instrument [Member] Physical Derivative Instrument [Member]	Dec. 31, 2011 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member] Trading [Member]	Dec. 31, 2010 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member] Trading [Member]	Dec. 31, 2011 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member] Non-trading [Member]	Dec. 31, 2010 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Financial Derivative Instrument [Member] Non-trading [Member]	Dec. 31, 2011 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Physical Derivative Instrument [Member] Non-trading [Member]	Dec. 31, 2010 Commodity Contract [Member] Not Designated as Hedging Instrument [Member] Physical Derivative Instrument [Member] Non-trading [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member]	Dec. 31, 2010 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member]	Dec. 31, 2009 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Revenues [Member]	Dec. 31, 2011 Interest Rate Contracts [Member] Cash Flow Hedging [Member]	Dec. 31, 2010 Interest Rate Contracts [Member] Cash Flow Hedging [Member]	Dec. 31, 2009 Interest Rate Contracts [Member] Cash Flow Hedging [Member]	Dec. 31, 2011 Interest Rate Contracts [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Dec. 31, 2010 Interest Rate Contracts [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Dec. 31, 2009 Interest Rate Contracts [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Dec. 31, 2011 Interest Rate Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2010 Interest Rate Contracts [Member] Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Assets	$ 630,847,000	$ 315,759,000																																																																																																														$ 184,246,000	$ 136,040,000	$ 446,601,000	$ 179,719,000																$ 184,184,000	$ 136,040,000	$ 62,000	$ 0	$ 111,920,000	$ 20,640,000	$ 295,948,000	$ 125,503,000	$ 38,733,000	$ 33,576,000										$ 0	$ 0
(Liabilities)	(637,241,000)	(195,536,000)																																																																																																														(202,356,000)	(24,726,000)	(434,885,000)	(170,810,000)																(73,346,000)	(23,843,000)	(344,000)	(883,000)	(110,050,000)	(18,656,000)	(323,170,000)	(144,940,000)	(1,665,000)	(7,214,000)										(128,666,000)	0
Inventory cash flow hedges derivative assets	88,900,000	44,900,000
Derivative [Line Items]
Derivative nonmonetary notional amount																																																					21.2	0.4	(23.4)	(7.6)	19.5	3.0	(111.9)	(69.9)	0	0	(2.9)	(1.5)	3.2	2.8	(82.8)	(64.9)													76.5	141.1	(77.0)	(141.1)				76.9	34.6	(59.6)	(20.6)	235.8	73.6	(253.4)	(100.3)	33.6	81.0	(14.3)	(74.3)	0	0.6	0	(0.6)	216.9	411.5	(219.3)	(419.7)	29.3	33.6	(22.1)	(6.1)
Notional amount of cash flow hedge instruments																																																																					1,250,000,000	0	0	0	200,000,000	500,000,000	750,000,000
Net unrealized gain in accumulated other comprehensive income (loss)	1,800,000
Amount recognized in the next 12 months	12,800,000
Amount recognized after the next 12 months	11,000,000
Adjustment to natural gas inventory at the lower of cost or market value.	91,100,000	58,700,000
Maturity date																																																																													Jan. 31, 2022
Face Amount																																																																												700,000,000
Interest rates (in hundredths)																																																																												425.00%
Amount of loss amortized to interest expense																																																																												44,100,000
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)																																																		(11,158,000)	128,662,000	50,943,000																																																																117,508,000	128,662,000	49,344,000																										(128,666,000)	0	1,599,000
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)																																																		137,739,000	77,395,000	152,608,000																																																																			89,618,000	9,158,000	(36,776,000)	48,601,000	68,209,000	188,144,000																							(480,000)	28,000	1,240,000
Total gain recognized in income on derivatives																																																																																					17,974,000	11,099,000	14,181,000																																						16,178,000	5,371,000	10,085,000	1,796,000	5,710,000	3,210,000											0	18,000	886,000
Premiums recorded in other current assets on natural gas contracts held	10,000,000	16,700,000
Amount of losses associated with the decline in value and expiration of option contracts which are deferred	14,500,000	25,500,000	22,600,000
Interest expense savings from the amortization of terminated swaps																																																																														4,300,000	10,200,000	10,300,000
Entity Information [Line Items]
Gains related to the change in fair value of derivatives	14,600,000	2,400,000	253,200,000
Change in fair value of the related hedged firm commitments for transportation contracts	13,800,000	2,700,000	250,500,000
Change in fair value of derivatives related to firm transportation commitments designated as fair value hedges			2,700,000
Fair value of collateral	5,900,000
Aggregate fair value of additional collateral	5,900,000
Credit Derivatives [Line Items]
Credit derivative, current fair value	$ 61,604,000	$ 63,861,000		$ 13,566,000	$ 9,254,000	$ 22,899,000	$ 35,765,000	$ 14,962,000	$ 7,700,000	$ 10,071,000	$ 11,121,000	$ 106,000	$ 21,000	$ 45,994,000	$ 52,114,000	$ 13,566,000	$ 9,254,000	$ 22,335,000	$ 33,847,000	$ 7,000	$ 18,000	$ 9,986,000	$ 8,995,000	$ 100,000	$ 0	$ 11,000	$ 1,275,000	$ 0	$ 0	$ 0	$ 1,240,000	$ 0	$ 0	$ 5,000	$ 35,000	$ 6,000	$ 0	$ 15,599,000	$ 10,472,000	$ 0	$ 0	$ 564,000	$ 678,000	$ 14,955,000	$ 7,682,000	$ 80,000	$ 2,091,000	$ 0	$ 21,000

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UNCONSOLIDATED AFFILIATES (Tables)

12 Months Ended

Dec. 31, 2011

UNCONSOLIDATED AFFILIATES [Abstract]

Schedule of Equity Method Investments

Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest
			December 31,		December 31,
			2011		2010
			(Thousands of dollars)
Northern Border Pipeline	50%	$	416,206	$	384,011
Overland Pass Pipeline Company	50%		447,449		443,392
Fort Union Gas Gathering, L.L.C.	37%		117,353		115,148
Bighorn Gas Gathering, L.L.C.	49%		91,748		92,659
Other	Various		150,642		152,914
Investments in unconsolidated affiliates (a)		$	1,223,398	$	1,188,124
(a) - Equity method goodwill (Note A) was $185.6 million at December 31, 2011 and 2010.

Equity Earnings from Investments

Equity Earnings from Investments -The following table sets forth our equity earnings from investments for the periods indicated.  All amounts in the table below are equity earnings from investments in our ONEOK Partners segment:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Northern Border Pipeline	$	76,365	$	68,124	$	41,300
Overland Pass Pipeline Company (a)		19,535		5,421		-
Fort Union Gas Gathering, L.L.C.		15,280		14,367		14,533
Bighorn Gas Gathering, L.L.C.		5,990		5,495		7,807
Other		10,076		8,473		9,082
Equity earnings from investments	$	127,246	$	101,880	$	72,722
(a) - Beginning in September 2010, following the sale of a 49-percent interest, Overland Pass Pipeline Company was deconsolidated and prospectively accounted for under the equity method.

Unconsolidated Affiliates Financial Information

Unconsolidated Affiliates Financial Information - The following tables set forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Balance Sheet
Current assets	$	133,579		$	93,698
Property, plant and equipment, net	$	2,451,798		$	2,500,708
Other noncurrent assets	$	35,548		$	28,222
Current liabilities	$	76,355		$	74,969
Long-term debt	$	534,485		$	616,210
Other noncurrent liabilities	$	15,510		$	13,773
Accumulated other comprehensive income (loss)	$	(2,700	)	$	(2,883	)
Owners' equity	$	1,997,275		$	1,920,559

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Income Statement (a)
Operating revenues	$	496,158	$	440,826	$	383,625
Operating expenses	$	221,261	$	189,437	$	178,194
Net income	$	249,559	$	223,715	$	164,002
Distributions paid to us	$	156,385	$	114,805	$	109,807
(a) - Financial information for 2011 is not directly comparable with 2010 and 2009 due to the deconsolidation of Overland Pass Pipeline Company in September 2010.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Dec. 31, 2011

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]

Accumulated other comprehensive income (loss)

The following table sets forth the balance in accumulated other comprehensive income (loss) for the periods indicated:

	Unrealized Gains  (Losses) on Energy  Marketing and Risk Management  Assets/Liabilities		Unrealized Holding Gains (Losses) on Investment Securities		Pension and  Postretirement  Benefit Plan  Obligations		Accumulated  Other  Comprehensive  Income (Loss)
		(Thousands of dollars)
January 1, 2010	$	(6,151)	$	1,441	$	(113,903)	$	(118,613)
Other comprehensive income (loss)    attributable to ONEOK		21,882		(70)		(12,001)		9,811
December 31, 2010		15,731		1,371		(125,904)		(108,802)
Other comprehensive income (loss)    attributable to ONEOK		(71,098)		(384)		(25,837)		(97,319)
December 31, 2011	$	(55,367)	$	987	$	(151,741)	$	(206,121)

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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Goodwill	$ 601,743,000	$ 602,844,000
Intangible assets related primarily to contracts acquired through acquisition	462,214,000	462,214,000
Aggregate weighted-average period of intangible assets amortization (in years)	40
Amortization expense for intangible assets	7,700,000	7,700,000	7,700,000
Future amortization expense for next five years [Abstract]
Future amortization expense, year one	7,700,000
Future amortization expense, year two	7,700,000
Future amortization expense, year three	7,700,000
Future amortization expense, year four	7,700,000
Future amortization expense, year five	7,700,000
Gross intangible assets and accumulated amortization [Abstract]
Gross Intangible Assets	462,214,000	462,214,000
Accumulated Amortization	(49,830,000)	(42,164,000)
Net Intangible Assets	412,384,000	420,050,000
ONEOK Partners [Member]
Segment Reporting Information [Line Items]
Goodwill	433,535,000	433,537,000
Intangible assets related primarily to contracts acquired through acquisition	256,800,000	264,500,000
Gross intangible assets and accumulated amortization [Abstract]
Gross Intangible Assets	256,800,000	264,500,000
Natural Gas Distribution [Member]
Segment Reporting Information [Line Items]
Goodwill	157,953,000	157,953,000
Energy Services [Member]
Segment Reporting Information [Line Items]
Goodwill	10,255,000	10,255,000
Other Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 0	$ 1,099,000

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UNCONSOLIDATED AFFILIATES (Details) (USD $)

9 Months Ended

12 Months Ended

Sep. 30, 2010

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Schedule of Equity Method Investments [Line Items]

Investments in unconsolidated affiliates

$ 1,223,398,000

$ 1,188,124,000

$ 765,163,000

Equity earnings from investments

127,246,000

101,880,000

72,722,000

Equity method goodwill

185,600,000

185,600,000

Balance Sheet [Abstract]

Current assets

133,579,000

93,698,000

Property, plant and equipment, net

2,451,798,000

2,500,708,000

Other noncurrent assets

35,548,000

28,222,000

Current liabilities

76,355,000

74,969,000

Long-term debt

534,485,000

616,210,000

Other noncurrent liabilities

15,510,000

13,773,000

Accumulated other comprehensive income (loss)

(2,700,000)

(2,883,000)

Owners' equity

1,997,275,000

1,920,559,000

Income Statement [Abstract]

Operating revenues

496,158,000

440,826,000

383,625,000

Operating expenses

221,261,000

189,437,000

178,194,000

Net income

249,559,000

223,715,000

164,002,000

Distributions paid to us

156,385,000

114,805,000

109,807,000

Overland Pass Pipeline Company [Member]

Schedule of Equity Method Investments [Line Items]

Sale of equity interest (in hundredths)

49.00%

Cash received at closing from sale of ownership interest

423,700,000

Gain on sale of assets in connection with deconsolidation

16,300,000

Investments in unconsolidated affiliates

438,000,000

447,449,000

443,392,000

Equity earnings from investments

19,535,000

5,421,000

0

Cash distributions, description

The Overland Pass Pipeline Company limited liability company agreement provides that distributions to Overland Pass Pipeline Company’s members are to be made on a pro rata basis according to each member’s percentage interest.  The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions.  Any changes to, or suspensions of, cash distributions from Overland Pass Pipeline Company requires the unanimous approval of the Overland Pass Pipeline Management Committee.  Cash distributions are equal to 100 percent of available cash as defined in the limited liability company agreement.

Net ownership percentage

50.00%

50.00%

Northern Border Pipeline [Member]

Schedule of Equity Method Investments [Line Items]

Investments in unconsolidated affiliates

416,206,000

384,011,000

Equity earnings from investments

76,365,000

68,124,000

41,300,000

Cash distributions, description

Northern Border Pipeline - The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline's partners are to be made on a pro rata basis according to each partner's percentage interest.  The Northern Border Pipeline Management Committee determines the amount and timing of such distributions.  Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee.  Cash distributions are equal to 100 percent of distributable cash flow as determined from Northern Border Pipeline's financial statements based upon EBITDA less interest expense and maintenance capital expenditures.  Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement.  The Northern Border Pipeline Management Committee has adopted a cash distribution policy related to financial ratio targets and capital contributions.  The cash distribution policy defines minimum equity-to- total-capitalization ratios to be used by the Northern Border Pipeline Management Committee to establish the timing and amount of required capital contributions.  In addition, any shortfall due to the inability to refinance maturing debt will be funded by capital contributions.

Net ownership percentage

50.00%

Equity method investments equity contribution

54,800,000

Fort Union Gas Gathering LLC [Member]

Schedule of Equity Method Investments [Line Items]

Investments in unconsolidated affiliates

117,353,000

115,148,000

Equity earnings from investments

15,280,000

14,367,000

14,533,000

Net ownership percentage

37.00%

Bighorn Gas Gathering LLC [Member]

Schedule of Equity Method Investments [Line Items]

Investments in unconsolidated affiliates

91,748,000

92,659,000

Equity earnings from investments

5,990,000

5,495,000

7,807,000

Net ownership percentage

49.00%

Other Unconsolidated Affiliate [Member]

Schedule of Equity Method Investments [Line Items]

Investments in unconsolidated affiliates

150,642,000

152,914,000

Equity earnings from investments

$ 10,076,000

$ 8,473,000

$ 9,082,000

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Percentage of ownership in subsidiary (in hundredths)

42.80%

Reportable business segments

3

Number of natural gas distribution services customers

2,000,000

Interest costs capitalized

$ 24.0

$ 4.9

$ 17.0

Regulatory assets

539.7

463.9

Amount of pension and postretirement benefit plans related to regulatory assets

$ 466.6

$ 375.1

Time period regulatory assets are being recovered (in years)

40Y

Number of years of service employees must work to be entitled to postretirement medical and life insurance benefits (in years)

5Y

Recently issued accounting standards update

Recently Issued Accounting Standards Update -In January 2010, the FASB issued ASU 2010-06, "Improving Disclosures about Fair Value Measurements," which requires separate disclosures of purchases, sales, issuances and settlements in the reconciliation of our Level 3 fair value measurements.  We adopted this guidance with our March 31, 2011, Quarterly Report, and the impact was not material.  Other provisions of ASU 2010-06 were adopted in 2010.

In May 2011, the FASB issued ASU 2011-04, "Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (IFRS)," which provides a consistent definition of fair value and common requirements for measurement of and disclosure about fair value between GAAP and IFRS.  This new guidance changes some fair value measurement principles and disclosure requirements.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In June 2011, the FASB issued ASU 2011-05, "Presentation of Comprehensive Income," which provides two options for presenting items of net income, comprehensive income and total comprehensive income by creating either one continuous statement of comprehensive income or two separate consecutive statements, and requires certain other disclosures.  In December 2011, the FASB issued ASU 2011-12, "Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05," which deferred certain presentation requirements in ASU 2011-05 for items reclassified out of accumulated other comprehensive income.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In September 2011, the FASB issued ASU 2011-08, "Testing Goodwill for Impairment," which permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount.  Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount.  An entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.  An entity may also resume performing the qualitative assessment in any subsequent period.  We will adopt this guidance beginning with our July 1, 2012, goodwill impairment test.

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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY [Abstract]
Dividends declared per share of common stock	$ 0.61	$ 2.16	$ 1.82	$ 1.64

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ONEOK PARTNERS (Details) (USD $)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Related Party Transaction [Line Items]

Ownership interest (in hundredths)

42.80%

Issuance of common units, units

11,001,800

Issuance of common units, dollars per unit

$ 30.38

Issuance of common units, value

$ 0

$ 322,701,000

$ 241,642,000

Contribution from general partner

6,800,000

Increase (decrease) in paid-in-capital

50,700,000

Total distributions paid

609,446,000

563,185,000

500,253,000

Total distributions declared

625,751,000

578,874,000

511,407,000

Payment to acquire OBPI

94,200,000

Partnership agreement

Cash Distributions - We receive distributions from ONEOK Partners on our common and Class B units and our 2-percent general partner interest, which includes our incentive distribution rights.  Under ONEOK Partners’ partnership agreement, as amended, distributions are made to the partners with respect to each calendar quarter in an amount equal to 100 percent of available cash as defined in ONEOK Partners’ partnership agreement, as amended.  Available cash generally will be distributed 98 percent to limited partners and 2 percent to the general partner.  The general partner’s percentage interest in quarterly distributions is increased after certain specified target levels are met during the quarter.  In July 2011, the partnership agreement was amended to adjust the formula for distributing available cash among the general partner and limited partners to reflect the two-for-one unit split.  Under the incentive distribution provisions, as set forth in ONEOK Partners’ partnership agreement, as amended, the general partner receives:

·   15 percent of amounts distributed in excess of $0.3025 per unit;

·   25 percent of amounts distributed in excess of $0.3575 per unit; and

·   50 percent of amounts distributed in excess of $0.4675 per unit.

Segment Reporting Information [Line Items]

Revenues

403,603,000

457,740,000

475,765,000

Expenses [Abstract]

Cost of sales and fuel

48,163,000

53,107,000

46,824,000

Administrative and general expenses

251,239,000

207,282,000

200,002,000

Total expenses

299,402,000

260,389,000

246,826,000

Dividend Declared [Member]

Related Party Transaction [Line Items]

Distribution (in dollars per unit)

$ 2.365

$ 2.250

$ 2.175

Dividend Paid [Member]

Related Party Transaction [Line Items]

Distribution (in dollars per unit)

$ 2.325

$ 2.230

$ 2.165

General Partner [Member]

Related Party Transaction [Line Items]

Ownership interest (in hundredths)

2.00%

2.00%

General Partner [Member] | Dividend Declared [Member]

Related Party Transaction [Line Items]

General partner distributions

12,515,000

11,578,000

10,228,000

Incentive distributions

131,213,000

108,711,000

87,734,000

Distributions to general partner

143,728,000

120,289,000

97,962,000

General Partner [Member] | Dividend Paid [Member]

Related Party Transaction [Line Items]

General partner distributions

12,189,000

11,264,000

10,005,000

Incentive distributions

123,386,000

103,463,000

84,657,000

Distributions to general partner

135,575,000

114,727,000

94,662,000

Limited Partner [Member]

Related Party Transaction [Line Items]

Ownership interest (in hundredths)

40.80%

40.80%

Common units

11,800,000

11,800,000

Class B units

73,000,000

73,000,000

Limited Partner [Member] | Dividend Declared [Member]

Related Party Transaction [Line Items]

Limited partner distributions to ONEOK

200,524,000

190,774,000

184,415,000

Limited partner distributions to noncontrolling interest

281,499,000

267,811,000

229,030,000

Limited Partner [Member] | Dividend Paid [Member]

Related Party Transaction [Line Items]

Limited partner distributions to ONEOK

197,133,000

189,078,000

183,567,000

Limited partner distributions to noncontrolling interest

$ 276,738,000

$ 259,380,000

$ 222,024,000

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ONEOK PARTNERS (Tables)

12 Months Ended

Dec. 31, 2011

ONEOK PARTNERS [Abstract]

Ownership interest in ONEOK Partners

Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below as of December 31, 2011 and 2010:

General partner interest	2.0%
Limited partner interest (a)	40.8%
Total ownership interest	42.8%
(a) - Represents 11.8 million common units and approximately 73.0 million Class B units, which are convertible, at our option, into common units.

ONEOK Partners' Distributions Paid

The following table shows ONEOK Partners' distributions paid in the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.325	$	2.230	$	2.165
General partner distributions	$	12,189	$	11,264	$	10,005
Incentive distributions		123,386		103,463		84,657
Distributions to general partner		135,575		114,727		94,662
Limited partner distributions to ONEOK		197,133		189,078		183,567
Limited partner distributions to noncontrolling interest		276,738		259,380		222,024
Total distributions paid	$	609,446	$	563,185	$	500,253

ONEOK Partners' Distributions Declared

The following table shows ONEOK Partners' distributions declared for the periods indicated and paid within 45 days of the end of the period:

	Years Ended December 31,
	2011		2010		2009
	(Thousands, except per unit amounts)
Distribution per unit	$	2.365	$	2.250	$	2.175
General partner distributions	$	12,515	$	11,578	$	10,228
Incentive distributions		131,213		108,711		87,734
Distributions to general partner		143,728		120,289		97,962
Limited partner distributions to ONEOK		200,524		190,774		184,415
Limited partner distributions to noncontrolling interest		281,499		267,811		229,030
Total distributions declared	$	625,751	$	578,874	$	511,407

ONEOK Partners' transactions

The following table shows ONEOK Partners' transactions with us for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Revenues	$	403,603	$	457,740	$	475,765
Expenses
Cost of sales and fuel	$	48,163	$	53,107	$	46,824
Administrative and general expenses		251,239		207,282		200,002
Total expenses	$	299,402	$	260,389	$	246,826

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2011

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Consolidation

Consolidation - Our consolidated financial statements include the accounts of ONEOK and our subsidiaries over which we have control.  We have recorded noncontrolling interests in consolidated subsidiaries on our Consolidated Balance Sheets to recognize the percent of ONEOK Partners that we do not own.  We reflected our ownership interest in ONEOK Partners' accumulated other comprehensive income (loss) in our consolidated accumulated other comprehensive income (loss).  The remaining portion is reflected as an adjustment to noncontrolling interests in consolidated subsidiaries.  All significant intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee; conversely, if we do not have the ability to exercise significant influence, then we use the cost method.  Impairment of equity and cost method investments is recorded when the impairments are other than temporary.  Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment.  The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates

Use of Estimates - The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements.  These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period.  Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets and liabilities, obligations under employee benefit plans, provisions for uncollectible accounts receivable, unbilled revenues for natural gas delivered but for which meters have not been read, gas purchased expense for natural gas purchased but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other recorded or disclosed amounts.

We evaluate these estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances.  Nevertheless, actual results may differ significantly from the estimates.  Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements

Fair Value Measurements -We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  Inputs into our fair value estimates include commodity exchange prices, over-the-counter quotes, volatility, historical correlations of pricing data and LIBOR and other liquid money market instrument rates.  We also utilize internally developed basis curves that incorporate observable and unobservable market data.  We validate our valuation inputs with third-party information and settlement prices from other sources, where available.  In addition, as prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  We also take into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions.  We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using specific and sector bond yields and also monitor the credit default swap markets.  Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be material.

The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value.  The levels of the hierarchy are described below:

·   Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;

·   Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date.  Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and

·   Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate.  These unobservable inputs are developed based on the best information available and may include our own internal data.

We recognize transfers into and out of Level 3 as of the end of each reporting period.  Transfers into Level 3 represent existing assets or liabilities that were categorized previously at a higher level for which the unobservable inputs became a more significant portion of the fair value estimates.  Transfers out of Level 3 represent existing assets and liabilities that were classified previously as Level 3 for which the observable inputs became a more significant portion of the fair value estimates.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data.  We categorize derivatives for which fair value is determined using multiple inputs within a single level, based on the lowest level input that is significant to the fair value measurement in its entirety.  See Note C for additional disclosures of our fair value measurements.

Cash and Cash Equivalents

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition

Revenue Recognition- Our operating segments recognize revenue when services are rendered or product is delivered.  ONEOK Partners' natural gas gathering and processing operations record revenue when gas is processed in or transported through its facilities.  ONEOK Partners' natural gas liquids operations record revenues based upon contracted services and actual volumes exchanged or stored under service agreements in the period services are provided.  Revenue for ONEOK Partners' natural gas pipelines and a portion of its natural gas liquids operations is recognized based upon contracted capacity and contracted volumes transported and stored under service agreements in the period services are provided.

Our Natural Gas Distribution segment's major industrial and commercial natural gas distribution customers are invoiced at the end of each month.  All natural gas distribution residential customers, all retail customers and some distribution commercial customers are invoiced on a cyclical basis throughout the month, and we accrue unbilled revenues at the end of each month.

Our Energy Services segment's wholesale customers are invoiced at the end of each month based on physical sales.  Demand payments received for requirements contracts are recognized in the period in which the service is provided.  Our fixed-price physical sales are accounted for as derivatives and are recorded at fair value.  See discussion below in "Derivative and Risk Management Activities" for additional information.

Accounts Receivable

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered, net of allowances for doubtful accounts.  We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate.  Outstanding customer receivables are reviewed regularly for possible nonpayment indicators and allowances for doubtful accounts are recorded based upon management's estimate of collectability at each balance sheet date.  At December 31, 2011 and 2010, our allowance for doubtful accounts was not material.

Inventories

Inventories - The values of current natural gas and NGLs in storage are determined using the lower of weighted-average cost or market method.  Noncurrent natural gas and NGLs are classified as property and valued at cost.  Materials and supplies are valued at average cost.

Commodity Imbalances

Commodity Imbalances -Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at fair value.  Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty.  In turn, we deliver NGL products back to the customer and charge them gathering and fractionation fees.  To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties.  These net exchange receivables and payables are settled with movements of NGL products rather than with cash.  Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines' tariffs or by agreement.

Derivatives and Risk Management Activities

Derivatives and Risk Management Activities - We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.

If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values, cash flows or foreign currency.  Certain nontrading derivative transactions, which are economic hedges of our accrual transactions such as our storage and transportation contracts, do not qualify for hedge accounting treatment.

The table below summarizes the various ways in which we account for our derivative instruments and the impact on our consolidated financial statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the derivative instrument is recognized in earnings
	-	Effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	Effective portion of the gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

Gains or losses associated with the fair value of derivative instruments entered into by our Natural Gas Distribution segment are included in, and recoverable through, the monthly purchased-gas cost mechanism.

We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness.  We specifically identify the asset, liability, firm commitment or forecasted transaction that has been designated as the hedged item.  We assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on our cash flow and fair value hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis.  We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The presentation of settled derivative instruments on either a gross or net basis in our Consolidated Statements of Income is dependent on the relevant facts and circumstances of our different types of activities rather than based solely on the terms of the individual contracts.  All financially settled derivative instruments, as well as derivative instruments considered held for trading purposes that result in physical delivery, are reported on a net basis in revenues in our Consolidated Statements of Income.  The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and nonderivative contracts are reported on a gross basis.  Derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are also reported on a gross basis.

Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties.  Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes C and D for more discussion of our fair value measurements and risk management and hedging activities using derivatives.

Property, Plant and Equipment

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC.  Generally, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation.  Gains and losses from sales or retirement of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income.  Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC represents the cost of borrowed funds used to finance construction activities.  We capitalize interest costs during the construction or upgrade of qualifying assets.  Interest costs capitalized in 2011, 2010 and 2009 were $24.0 million, $4.9 million and $17.0 million, respectively.  Capitalized interest is recorded as a reduction to interest expense.  The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives.  Generally, we apply composite depreciation rates to functional groups of property having similar economic circumstances.  We periodically conduct depreciation studies to assess the economic lives of our assets.  For our regulated assets, these depreciation studies are completed as a part of our rate proceedings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are billed.  For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively.  Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

Property, plant and equipment on our Consolidated Balance Sheets includes construction work in progress for capital projects that have not yet been placed in service and therefore are not being depreciated.  Assets are transferred out of construction work in progress when they are substantially complete and ready for their intended use.

See Note E for disclosures of our property, plant and equipment.

Impairment of Goodwill and Long-Lived Assets, including Intangible Assets

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill and indefinite-lived intangible assets for impairment at least annually as of July 1.  As part of our impairment test, an initial assessment is made by comparing the fair value of a reporting unit with its book value, including goodwill.  If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the impairment.  In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets of the reporting unit from the fair value determined in step one of the assessment.  If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.  There were no impairment charges resulting from our 2011, 2010 or 2009 impairment tests.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant's perspective.  Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates.  Under the market approach, we apply multiples to forecasted cash flows.  The multiples used are consistent with historical asset transactions.  The forecasted cash flows are based on average forecasted cash flows over a period of years.

As part of our indefinite-lived intangible asset impairment test, we compare the estimated fair value of our indefinite-lived intangible assets with their book values.  The fair value of our indefinite-lived intangible assets is estimated using the market approach.  Under the market approach, we apply multiples to forecasted cash flows of the assets associated with our indefinite-lived intangible assets.  The multiples used are consistent with historical asset transactions.  We determined that there were no impairments to our indefinite-lived intangible asset in 2011, 2010 or 2009.

We assess our long-lived assets, including intangible assets with finite useful lives, for impairment whenever events or changes in circumstances indicate that an asset's carrying amount may not be recoverable.  An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset.  If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.  We determined that there were no asset impairments in 2011, 2010 or 2009.

For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary.  Therefore, we periodically reevaluate the amount at which we carry our equity method investments to determine whether current events or circumstances warrant adjustments to our carrying value.  We determined that there were no impairments to our investments in unconsolidated affiliates in 2011, 2010 or 2009.

Our impairment tests require the use of assumptions and estimates such as industry economic factors and the profitability of future business strategies.  If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Notes E and F for our goodwill and long-lived assets disclosures.

Regulation

Regulation - Our natural gas distribution operations and ONEOK Partners’ intrastate natural gas transmission pipelines are subject to the rate regulation and accounting requirements of the OCC, KCC, RRC and various municipalities in Texas.  ONEOK Partners’ interstate natural gas and natural gas liquids pipelines are subject to regulation by the FERC.  In Kansas and Texas, natural gas storage may be regulated by the state and the FERC for certain types of services.  Oklahoma Natural Gas, Kansas Gas Service, Texas Gas Service and portions of our ONEOK Partners segment follow the accounting and reporting guidance for regulated operations.  During the rate-making process, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time, as opposed to expensing such costs as incurred.  Examples include costs for fuel and fuel losses, acquisition costs and contributions in aid of construction.  This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery.  Actions by regulatory authorities could have an effect on the amount recovered from rate payers.  Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action.  A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer:

·   established by independent, third-party regulators;

·   designed to recover the specific entity’s costs of providing regulated services; and

·   set at levels that will recover our costs when considering the demand and competition for our services.

At December 31, 2011 and 2010, we recorded regulatory assets of approximately $539.7 million and $463.9 million, respectively, which are being recovered as a result of various approved rate proceedings or are expected to be recovered.  Of these amounts, approximately $466.6 million and $375.1 million relate to our pension and postretirement benefit plans at December 31, 2011 and 2010, respectively, which are discussed on page 107.  Regulatory assets are being recovered as a result of approved rate proceedings over varying time periods up to 40 years.  These assets are reflected in other assets on our Consolidated Balance Sheets.

Pension and Postretirement Employee Benefits

Pension and Postretirement Employee Benefits - We have defined benefit retirement plans covering certain full-time employees.  We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  Our actuarial consultant calculates the expense and liability related to these plans and uses statistical and other factors that attempt to anticipate future events.  These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and employment periods.  In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the costs and liabilities we recognize.  See Note M for more discussion of pension and postretirement employee benefits.

Income Taxes

Income Taxes - Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carry-forward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse.  The effect on deferred taxes of a change in tax rates is deferred and amortized for operations regulated by the OCC, KCC, RRC and various municipalities in Texas if, as a result of an action by a regulator, it is probable that the effect of the change in tax rates will be recovered from or returned to customers through future rates.  For all other operations, the effect is recognized in income in the period that includes the enactment date.  We continue to amortize previously deferred investment tax credits for ratemaking purposes over the period prescribed by the OCC, KCC, RRC and various municipalities in Texas.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return.  We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute.  During 2011, 2010 and 2009, our tax positions did not require an establishment of a material reserve.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States and Canada, along with the tax authorities of several states.  There are no United States federal audits or statute waivers at this time.  We have been notified by the state of Texas of its intent to audit tax years 2008-2011.  See Note N for additional discussion of income taxes.

Asset Retirement Obligations

Asset Retirement Obligations - Asset retirement obligationsrepresent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset.  We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made.  We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets because the settlement dates are indeterminable.  For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset.  The liability is accreted at the end of each period through charges to operating expense.  If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement.  The depreciation and amortization expense are immaterial to our consolidated financial statements.

In accordance with long-standing regulatory treatment, we collect through rates the estimated costs of removal on certain regulated properties through depreciation expense, with a corresponding credit to accumulated depreciation and amortization.  These removal costs are nonlegal obligations; however, the amounts collected that are in excess of these nonlegal asset-removal costs incurred are accounted for as a regulatory liability.  Historically, the regulatory authorities that have jurisdiction over our regulated operations have not required us to quantify this amount; rather, these costs are addressed prospectively in depreciation rates and are set in each general rate order.  We have made an estimate of our regulatory liability using current rates since the last general rate order in each of our jurisdictions; however, significant uncertainty exists regarding the ultimate determination of this liability, pending, among other issues, clarification of regulatory intent.  We continue to monitor the regulatory authorities, and the liability may be adjusted as more information is obtained.  We record the estimated nonlegal asset removal obligation in noncurrent liabilities in other deferred credits on our Consolidated Balance Sheets.  To the extent this estimated liability is adjusted, such amounts will be reclassified between accumulated depreciation and amortization and other deferred credits and therefore will not have an impact on earnings.

Contingencies

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures.  We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably.  We base our estimates on currently available facts and our estimates of the ultimate outcome or resolution.  Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study.  Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable.  Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.  See Note Q for additional discussion of contingencies.

Share-Based Payments

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures.  We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

Earnings per Common Share

Earnings per Common Share - Basic EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period.  Diluted EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components.  The dilutive components are calculated based on the dilutive effect for each quarter.  For fiscal year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

Recently Issued Accounting Standards Update

Recently Issued Accounting Standards Update -In January 2010, the FASB issued ASU 2010-06, "Improving Disclosures about Fair Value Measurements," which requires separate disclosures of purchases, sales, issuances and settlements in the reconciliation of our Level 3 fair value measurements.  We adopted this guidance with our March 31, 2011, Quarterly Report, and the impact was not material.  Other provisions of ASU 2010-06 were adopted in 2010.

In May 2011, the FASB issued ASU 2011-04, "Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (IFRS)," which provides a consistent definition of fair value and common requirements for measurement of and disclosure about fair value between GAAP and IFRS.  This new guidance changes some fair value measurement principles and disclosure requirements.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In June 2011, the FASB issued ASU 2011-05, "Presentation of Comprehensive Income," which provides two options for presenting items of net income, comprehensive income and total comprehensive income by creating either one continuous statement of comprehensive income or two separate consecutive statements, and requires certain other disclosures.  In December 2011, the FASB issued ASU 2011-12, "Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05," which deferred certain presentation requirements in ASU 2011-05 for items reclassified out of accumulated other comprehensive income.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In September 2011, the FASB issued ASU 2011-08, "Testing Goodwill for Impairment," which permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount.  Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount.  An entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.  An entity may also resume performing the qualitative assessment in any subsequent period.  We will adopt this guidance beginning with our July 1, 2012, goodwill impairment test.

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QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Dec. 31, 2011

QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]

QUARTERLY FINANCIAL DATA (UNAUDITED)

S.           QUARTERLY FINANCIAL DATA (UNAUDITED)

	First		Second		Third			Fourth
Year Ended December 31, 2011	Quarter		Quarter		Quarter			Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,760,600	$	3,444,798	$	3,529,359		$	4,071,037
Net margin (a)	$	629,877	$	518,833	$	532,624		$	699,025
Income from continuing operations (a)	$	198,285	$	134,330	$	161,158		$	263,741
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,061	$	437	$	(278	)	$	1,010
Net income	$	199,346	$	134,767	$	160,880		$	264,751
Net income attributable to ONEOK	$	130,130	$	55,142	$	60,321		$	115,001
Earnings per share total
Basic	$	1.22	$	0.52	$	0.58		$	1.12
Diluted	$	1.19	$	0.51	$	0.57		$	1.09

	First		Second		Third		Fourth
Year Ended December 31, 2010	Quarter		Quarter		Quarter		Quarter
	(Thousands of dollars except per share amounts)
Total revenues (a)	$	3,780,203	$	2,740,689	$	2,877,849	$	3,280,050
Net margin (a)	$	615,099	$	455,558	$	449,504	$	542,009
Income from continuing operations (a)	$	185,232	$	86,146	$	120,005	$	148,675
Income (loss) from operations of discontinued
operations, net of tax (a)	$	1,488	$	228	$	296	$	(740	)
Net income	$	186,720	$	86,374	$	120,301	$	147,935
Net income attributable to ONEOK	$	154,539	$	41,724	$	55,295	$	83,074
Earnings per share total
Basic	$	1.46	$	0.39	$	0.52	$	0.78
Diluted	$	1.44	$	0.39	$	0.51	$	0.76
(a) These amounts vary from the amounts previously filed due to the sale of ONEOK Energy Marketing Company
in February 2012. See Note B for additional information on our discontinued operations.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance of accumulated other comprehensive income (loss) [Abstract]
Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities	$ (55,367)	$ 15,731	$ (6,151)
Unrealized Holding Gains (Losses) on Investment Securities	987	1,371	1,441
Pension and Postretirement Benefit Plan Obligations	(151,741)	(125,904)	(113,903)
Accumulated Other Comprehensive Income (Loss)	(206,121)	(108,802)	(118,613)
Other comprehensive income (loss) attributable to ONEOK [Abstract]
Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities	(71,098)	21,882
Unrealized Holding Gains (Losses) on Investment Securities	(384)	(70)	627
Pension and Postretirement Benefit Plan Obligations	(25,837)	(12,001)	(14,560)
Accumulated Other Comprehensive Income (Loss)	$ (97,319)	$ 9,811

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2011

COMMITMENTS AND CONTINGENCIES [Abstract]

Future Minimum Rental Payments for Operating Lease ad Firm Transportation and Storage Contracts

The following table sets forth our operating lease and firm transportation and storage contract payments for the periods indicated:

ONEOK		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	1.2		$	122.4	$	123.6
2013		0.9			87.5		88.4
2014		0.6			68.2		68.8
2015		0.3			42.9		43.2
2016		-			26.4		26.4
Thereafter		-			23.2		23.2
Total	$	3.0		$	370.6	$	373.6

ONEOK Partners		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	3.4		$	9.0	$	12.4
2013		2.8			6.5		9.3
2014		2.8			6.2		9.0
2015		1.3			6.1		7.4
2016		1.0			4.7		5.7
Thereafter		6.4			5.7		12.1
Total	$	17.7		$	38.2	$	55.9

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DISCONTINUED OPERATIONS (Tables)

12 Months Ended

Dec. 31, 2011

DISCONTINUED OPERATIONS (Tables) [Abstract]

Discontinued Operations

The amounts of revenue, costs and income taxes reported in discontinued operations are set forth in the table below for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Operating revenues	$	313,371		$	351,260		$	305,897
Cost of sales and fuel		302,561			340,888			287,902
Net margin		10,810			10,372			17,995
Operating costs		7,147			8,914			6,162
Depreciation, depletion and amortization		128			93			68
Operating income		3,535			1,365			11,765
Other income (expense), net		(50	)		21			95
Income taxes		(1,255	)		(114	)		(4,313	)
Income from discontinued operations, net	$	2,230		$	1,272		$	7,547

The following table discloses the major classes of discontinued assets and liabilities included on our Consolidated Balance Sheets for the periods indicated:

	December 31,
	2011		2010
Assets	(Thousands of dollars)
Cash and cash equivalents	$	8,859	$	693
Accounts receivable, net		47,967		48,834
Gas in storage		2,101		2,020
Energy marketing and risk management assets		15,016		7,703
Property, plant and equipment, net		145		235
Other assets		48		40
Assets of discontinued operations	$	74,136	$	59,525
Liabilities
Accounts payable	$	11,435	$	3,147
Energy marketing and risk management liabilities		629		1,053
Other liabilities		751		8,009
Liabilities of discontinued operations	$	12,815	$	12,209

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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2011

FAIR VALUE MEASUREMENTS [Abstract]

Recurring Fair Value Measurments

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for our continuing and discontinued operations for the periods indicated:

	December 31, 2011
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	545,247		$	13,874		$	32,931		$	-		$	592,052
Physical contracts		-			23,879			14,916			-			38,795
Netting		-			-			-			(569,243	)		(569,243	)
Total derivatives		545,247			37,753			47,847			(569,243	)		61,604
Trading securities (b)		5,749			-			-			-			5,749
Available-for-sale investment securities (c)		1,949			-			-			-			1,949
Total assets	$	552,945		$	37,753		$	47,847		$	(569,243	)	$	69,302
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(479,073	)	$	(6,498	)	$	(20,995	)	$	-		$	(506,566	)
Physical contracts		-			(261	)		(1,748	)		-			(2,009	)
Netting		-			-			-			497,608			497,608
Interest-rate contracts		-			(128,666	)		-			-			(128,666	)
Total derivatives		(479,073	)		(135,425	)		(22,743	)		497,608			(139,633	)
Fair value of firm commitments (d)		-			-			(7,283	)		-			(7,283	)
Total liabilities	$	(479,073	)	$	(135,425	)	$	(30,026	)	$	497,608		$	(146,916	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2011, we held $73.3 million of cash collateral and had posted $1.7 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred assets.

	December 31, 2010
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	127,789		$	1,755		$	152,639		$	-		$	282,183
Physical contracts		-			13,185			20,391			-			33,576
Netting		-			-			-			(251,898	)		(251,898	)
Total derivatives		127,789			14,940			173,030			(251,898	)		63,861
Trading securities (b)		7,591			-			-			-			7,591
Available-for-sale investment securities (c)		2,574			-			-			-			2,574
Total assets	$	137,954		$	14,940		$	173,030		$	(251,898	)	$	74,026
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(64,768	)	$	(3,241	)	$	(119,430	)	$	-		$	(187,439	)
Physical contracts		-			(3,763	)		(4,334	)		-			(8,097	)
Netting		-			-			-			170,515			170,515
Total derivatives		(64,768	)		(7,004	)		(123,764	)		170,515			(25,021	)
Fair value of firm commitments (d)		-			-			(29,536	)		-			(29,536	)
Total liabilities	$	(64,768	)	$	(7,004	)	$	(153,300	)	$	170,515		$	(54,557	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2010, we held $82.5 million of cash collateral and had posted $1.1 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred credits.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following tables set forth the reconciliation of our Level 3 fair value measurements for the periods indicated:

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2011	$	49,266		$	(29,536	)	$	19,730
Total realized/unrealized gains (losses):
Included in earnings (a)		(28,425	)		22,253			(6,172	)
Included in other comprehensive income (loss)		5,443			-			5,443
Transfers into Level 3		1,428			-			1,428
Transfers out of Level 3		(2,608	)		-			(2,608	)
December 31, 2011	$	25,104		$	(7,283	)	$	17,821
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2011 (a)	$	21,349		$	(6,581	)	$	14,768
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2010	$	136,694		$	(134,620	)	$	2,074
Total realized/unrealized gains (losses):
Included in earnings (a)		(91,662	)		105,084			13,422
Included in other comprehensive income (loss)		11,122			-			11,122
Transfers into Level 3		765			-			765
Transfers out of Level 3		(7,653	)		-			(7,653	)
December 31, 2010	$	49,266		$	(29,536	)	$	19,730
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2010 (a)	$	22,101		$	(4,551	)	$	17,550
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests in Consolidated Subsidiaries [Member]
Shareholders' equity, beginning balance at Dec. 31, 2008	$ 3,167,539	$ 1,216	$ 1,301,153	$ (70,616)	$ 1,553,033	$ (696,616)	$ 1,079,369
Common stock issued, beginning balance (in shares) at Dec. 31, 2008		121,647,007
Net income	491,204	0	0	0	305,451	0	185,753
Other comprehensive income (loss)	(93,783)	0	0	(47,997)	0	0	(45,786)
Repurchase of common stock	(254)	0	0	0	0	(254)	0
Common stock issued	34,598	8	21,187	0	0	13,403	0
Common stock issued (in shares)		747,008
Common stock dividends - $1.64, $1.82 an $2.16 per share	(172,774)	0	0	0	(172,774)	0	0
Issuance of common units of ONEOK Partners	241,642	0	0	0	0	0	241,642
Distributions to noncontrolling interests	(222,710)	0	0	0	0	0	(222,710)
Shareholders' equity, ending balance at Dec. 31, 2009	3,445,462	1,224	1,322,340	(118,613)	1,685,710	(683,467)	1,238,268
Common stock issued, ending balance (in shares) at Dec. 31, 2009		122,394,015
Net income	541,330	0	0	0	334,632	0	206,698
Other comprehensive income (loss)	25,506	0	0	9,811	0	0	15,695
Repurchase of common stock	(7)	0	0	0	0	(7)	0
Common stock issued	39,804	4	19,600	0	0	20,200	0
Common stock issued (in shares)		421,621
Common stock dividends - $1.64, $1.82 an $2.16 per share	(193,542)	0	0	0	(193,542)	0	0
Issuance of common units of ONEOK Partners	322,701	0	50,731	0	0	0	271,970
Distributions to noncontrolling interests	(260,385)	0	0	0	0	0	(260,385)
Other	(28)	0	0	0	0	0	(28)
Shareholders' equity, ending balance at Dec. 31, 2010	3,920,841	1,228	1,392,671	(108,802)	1,826,800	(663,274)	1,472,218
Common stock issued, ending balance (in shares) at Dec. 31, 2010		122,815,636
Net income	759,744	0	0	0	360,594	0	399,150
Other comprehensive income (loss)	(130,153)	0	0	(97,319)	0	0	(32,834)
Repurchase of common stock	(300,108)	0	0	0	0	(300,108)	0
Common stock issued	53,803	1	25,743		0	28,059	0
Common stock issued (in shares)		89,288		0
Common stock dividends - $1.64, $1.82 an $2.16 per share	(227,020)	0	0	0	(227,020)	0	0
Distributions to noncontrolling interests	(277,375)	0	0	0	0	0	(277,375)
Shareholders' equity, ending balance at Dec. 31, 2011	$ 3,799,732	$ 1,229	$ 1,418,414	$ (206,121)	$ 1,960,374	$ (935,323)	$ 1,561,159
Common stock issued, ending balance (in shares) at Dec. 31, 2011		122,904,924

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Tables)

12 Months Ended

Dec. 31, 2011

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES [Abstract]

Fair value of derivatives

Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments for our continuing and discontinued operations for the periods indicated:

	December 31, 2011						December 31, 2010
	Fair Values of Derivatives (a)						Fair Values of Derivatives (a)
	Assets			(Liabilities)			Assets			(Liabilities)
	(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts
Financial contracts	$	184,184	(b)	$	(73,346	)	$	136,040	(c)	$	(23,843	)
Physical contracts		62			(344	)		-			(883	)
Interest-rate contracts		-			(128,666	)		-			-
Total derivatives designated as hedging instruments		184,246			(202,356	)		136,040			(24,726	)
Derivatives not designated as hedging instruments
Commodity contracts
Nontrading instruments
Financial contracts		295,948			(323,170	)		125,503			(144,940	)
Physical contracts		38,733			(1,665	)		33,576			(7,214	)
Trading instruments
Financial contracts		111,920			(110,050	)		20,640			(18,656	)
Total derivatives not designated as hedging instruments		446,601			(434,885	)		179,719			(170,810	)
Total derivatives	$	630,847		$	(637,241	)	$	315,759		$	(195,536	)
(a) - Included on a net basis in energy marketing and risk-management assets and liabilities on our Consolidated Balance Sheets.
(b) - Includes $88.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.
(c) - Includes $44.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.

Notional amounts of derivative instruments

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for our continuing and discontinued operations for the periods indicated:

					December 31, 2011		December 31, 2010
				Contract Type	Purchased/ Payor	Sold/ Receiver	Purchased/ Payor	Sold/ Receiver
Derivatives designated as hedging instruments:
	Cash flow hedges
		Fixed price
			- Natural gas (Bcf)	Exchange futures	21.2	(23.4)	0.4	(7.6)
				Swaps	19.5	(111.9)	3.0	(69.9)
			- Crude oil and NGLs (MMBbl)	Swaps	-	(2.9)	-	(1.5)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	3.2	(82.8)	2.8	(64.9)
		Interest-rate contracts (Millions of dollars)		Forward-starting swaps	$1,250.0	-	-	-
	Fair value hedges
		Basis
			- Natural gas (Bcf)	Forwards and swaps	76.5	(77.0)	141.1	(141.1)
Derivatives not designated as hedging instruments:
		Fixed price
			- Natural gas (Bcf)	Exchange futures	76.9	(59.6)	34.6	(20.6)
				Forwards and swaps	235.8	(253.4)	73.6	(100.3)
				Options	33.6	(14.3)	81.0	(74.3)
			- Crude and NGLs (MMBbl)	Forwards and swaps	-	-	0.6	(0.6)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	216.9	(219.3)	411.5	(419.7)
		Index
			- Natural gas (Bcf)	Forwards and swaps	29.3	(22.1)	33.6	(6.1)

Schedule of cash flow hedging instruments effect on comprehensive income (loss)

The following table sets forth the effect of cash flow hedges recognized in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
Derivatives in Cash Flow Hedging Relationships	2011			2010		2009
	(Thousands of dollars)
Commodity contracts	$	117,508		$	128,662	$	49,344
Interest rate contracts		(128,666	)		-		1,599
Total gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	$	(11,158	)	$	128,662	$	50,943

Schedule of cash flow hedging instruments effect on income

The following tables set forth the effect of cash flow hedges on our Consolidated Statements of Income for the periods indicated:

	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income  (Loss) into Net Income (Effective Portion)
Derivatives in Cash Flow			Years Ended December 31,
Hedging Relationships			2011			2010		2009
			(Thousands of dollars)
Commodity contracts	Revenues	$	48,601		$	68,209	$	188,144
Commodity contracts	Cost of sales and fuel		89,618			9,158		(36,776	)
Interest rate contracts	Interest expense		(480	)		28		1,240
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)		$	137,739		$	77,395	$	152,608

Schedule of derivatives not designated as hedging effect on income

Other Derivative Instruments - The following table sets forth the effect of our derivative instruments that are not part of a hedging relationship on our Consolidated Statements of Income for our continuing and discontinued operations for the periods indicated:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss)		Years Ended December 31,
			2011		2010		2009
			(Thousands of dollars)
Commodity contracts - trading	Revenues	$	1,796	$	5,710	$	3,210
Commodity contracts - non-trading (a)	Cost of sales and fuel		16,178		5,371		10,085
Foreign exchange contracts	Revenues		-		18		886
Total gain recognized in income on derivatives		$	17,974	$	11,099	$	14,181
(a) - Amounts are presented net of deferred losses associated with derivatives entered into by our Natural Gas Distribution segment.

Schedule of net credit exposure from derivative assets

The following tables set forth the net credit exposure from our derivative assets for the period indicated:

	December 31, 2011
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	22,335	$	-	$	564	$	22,899
Oil and gas		9,986		5		80		10,071
Industrial		7		-		14,955		14,962
Financial		13,566		-		-		13,566
Other		100		6		-		106
Total	$	45,994	$	11	$	15,599	$	61,604

	December 31, 2010
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	33,847	$	1,240	$	678	$	35,765
Oil and gas		8,995		35		2,091		11,121
Industrial		18		-		7,682		7,700
Financial		9,254		-		-		9,254
Other		-		-		21		21
Total	$	52,114	$	1,275	$	10,472	$	63,861

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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Pension and postretirement benefit plans obligations and fair value of plan assets

Obligations and Funded Status - The following tables set forth our pension and postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated.

	Pension Benefits								Postretirement Benefits
	December 31,								December 31,
	2011				2010				2011			2010
Change in Benefit Obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	1,098,232			$	997,003			$	295,483		$	267,666
Service cost		20,013				19,277				4,987			4,926
Interest cost		58,757				58,143				15,632			15,643
Plan participants' contributions		-				-				6,751			3,048
Actuarial (gain) loss		92,609				75,704				25,617			20,761
Benefits paid		(53,679	)			(51,895	)			(17,864	)		(16,561	)
Plan amendment		-				-				(44,562	)		-
Benefit obligation, end of period		1,215,932				1,098,232				286,044			295,483
Change in Plan Assets
Fair value of plan assets, beginning of period		904,089				748,686				117,585			92,360
Actual return on plan assets		(10,750	)			110,473				(4,876	)		12,677
Employer contributions		62,575		(a)		96,825		(b)		11,454			12,548
Benefits paid		(53,679	)			(51,895	)			-			-
Fair value of assets, end of period		902,235				904,089				124,163			117,585
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
Current liabilities	$	(4,545	)		$	(4,203	)		$	-		$	-
Non-current liabilities		(309,152	)			(189,940	)			(161,881	)		(177,898	)
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
(a) - Includes $62.6 million contributed for the 2012 plan year.
(b) - Includes $57.0 million contributed for the 2011 plan year.

Components of net periodic benefit cost for pension and postretirement benefit plans

Components of Net Periodic Benefit Cost -The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	20,013		$	19,277		$	20,762
Interest cost		58,757			58,143			58,052
Expected return on assets		(75,500	)		(73,651	)		(66,034	)
Amortization of unrecognized prior service cost		1,018			1,278			1,565
Amortization of net loss		35,708			27,555			17,322
Net periodic benefit cost	$	39,996		$	32,602		$	31,667

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	4,987		$	4,926		$	5,173
Interest cost		15,632			15,643			16,918
Expected return on assets		(10,272	)		(7,896	)		(6,809	)
Amortization of unrecognized net asset at adoption		3,189			3,189			3,189
Amortization of unrecognized prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of net loss		8,123			7,009			9,660
Net periodic benefit cost	$	19,141		$	20,868		$	26,128

Amounts recognized in other comprehensive income (loss)

Other Comprehensive Income (Loss) - The following tables set forth the amounts recognized in other comprehensive income (loss) related to our pension benefits and postretirement benefits for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	114,625		$	19,146		$	(4,674	)
Net loss arising during the period		(182,987	)		(43,055	)		(30,340	)
Amortization of regulatory asset		(23,265	)		(18,359	)		(11,465	)
Amortization of prior service credit		1,018			1,278			1,565
Amortization of loss		35,708			27,555			17,322
Deferred income taxes		21,236			5,197			10,674
Total recognized in other comprehensive income (loss)	$	(33,665	)	$	(8,238	)	$	(16,918	)

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	7,389		$	8,408		$	(19,292	)
Net gain (loss) arising during the period		(40,765	)		(15,980	)		21,692
Amortization of regulatory asset		(7,214	)		(6,759	)		(9,400	)
Amortization of transition obligation		3,189			3,189			3,189
Amortization of prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of loss		8,123			7,009			9,660
Plan amendment		44,562			-			-
Deferred income taxes		(4,938	)		2,373			(1,488	)
Total recognized in other comprehensive income (loss)	$	7,828		$	(3,763	)	$	2,358

Amounts in accumulated other comprehensive income (loss)

The table below sets forth the amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Pension Benefits						Postretirement Benefits
	December 31,						December 31,
	2011			2010			2011			2010
	(Thousands of dollars)
Transition obligation	$	-		$	-		$	(3,157	)	$	(6,346	)
Prior service credit (cost)		(2,991	)		(4,009	)		46,426			4,377
Accumulated gain (loss)		(630,886	)		(483,607	)		(123,489	)		(90,846	)
Accumulated other comprehensive income (loss)      before regulatory assets		(633,877	)		(487,616	)		(80,220	)		(92,815	)
Regulatory asset for regulated entities		407,886			316,527			58,752			58,577
Accumulated other comprehensive income (loss)      after regulatory assets		(225,991	)		(171,089	)		(21,468	)		(34,238	)
Deferred income taxes		87,413			66,180			8,305			13,243
Accumulated other comprehensive income (loss),      net of tax	$	(138,578	)	$	(104,909	)	$	(13,163	)	$	(20,995	)

Amounts in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense

The following table sets forth the amounts recognized in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense in the next fiscal year:

	Pension		Postretirement
	Benefits		Benefits
Amounts to be recognized in 2012	(Thousands of dollars)
Transition obligation	$	-	$	2,874
Prior service credit (cost)	$	969	$	(8,252	)
Net loss	$	48,439	$	13,184

Weighted-average assumptions used to determine benefit obligations and net periodic benefit costs

Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postretirement benefits for the periods indicated:

	Years Ended
	December 31,
	2011	2010
Discount rate	5.00%	5.50%
Compensation increase rate	3.2% - 3.8%	3.3% - 3.9%

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended
	December 31,
	2011	2010		2009
Discount rate	5.50%		6.00%		6.25%
Expected long-term return on plan assets	8.25%		8.50%		8.50%
Compensation increase rate	3.30% - 3.90%		3.1% - 4.0%		4.3% - 4.8%

Assumed health care cost trend rates

Health Care Cost Trend Rates -The following table sets forth the assumed health care cost trend rates for the periods indicated:

	2011		2010
Health care cost-trend rate assumed for next year		4.0% - 9.0%		6.0% - 9.0%
Rate to which the cost-trend rate is assumed
to decline (the ultimate trend rate)		4.0% - 5.0%		5.0%
Year that the rate reaches the ultimate trend rate		2021		2020

Effects of a one percentage point change in assumed health care costs trend rates

Assumed health care cost trend rates have a significant effect on the amounts reported for our health care plans.  A one percentage point change in assumed health care cost trend rates would have the following effects:

	One Percentage		One Percentage
	Point Increase		Point Decrease
	(Thousands of dollars)
Effect on total of service and interest cost	$	1,833	$	(1,559	)
Effect on postretirement benefit obligation	$	17,562	$	(16,079	)

Schedule of allocation of plan assets

Plan Assets -Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals.  The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan's current and projected financial obligations.  The plan's investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, insurance contracts and venture capital.  The target allocation for the assets of our pension plan is as follows:

U.S. large-cap equities	37%
Aggregate bonds	24%
Developed foreign large-cap equities	10%
Alternative investments	8%
Mid-cap equities	6%
Emerging markets equities	5%
Small-cap equities	4%
High yield bonds	3%
Developed foreign bonds	2%
Emerging market bonds	1%
Total	100%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.  All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock.

The following tables set forth our pension benefits and postretirement benefits plan assets by category as of the measurement date:

	Pension Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	481,971	$	32,475	$	-	$	514,446
Government obligations		-		96,341		-		96,341
Corporate obligations (b)		18,835		58,977		-		77,812
Cash and money market funds (c)		76,575		-		-		76,575
Insurance contracts and group annuity contracts		-		-		70,818		70,818
Other investments (d)		-		-		66,243		66,243
Total assets	$	577,381	$	187,793	$	137,061	$	902,235
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Pension Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	588,224	$	-	$	-	$	588,224
Government obligations		-		80,233		-		80,233
Corporate obligations (b)		26,439		49,199		-		75,638
Cash and money market funds (c)		86,734		-		-		86,734
Insurance contracts and group annuity contracts		-		-		72,198		72,198
Other investments (d)		-		-		1,062		1,062
Total assets	$	701,397	$	129,432	$	73,260	$	904,089
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	21,915	$	113	$	-	$	22,028
Government obligations		-		334		-		334
Corporate obligations (b)		12,156		205		-		12,361
Cash and money market funds (c)		12,477		-		-		12,477
Insurance contracts and group annuity contracts		-		76,733		-		76,733
Other investments (d)		-		-		230		230
Total assets	$	46,548	$	77,385	$	230	$	124,163
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,261	$	-	$	-	$	17,261
Corporate obligations (b)		12,149		-		-		12,149
Cash and money market funds (c)		12,614		-		-		12,614
Insurance contracts and group annuity contracts		-		75,561		-		75,561
Total assets	$	42,024	$	75,561	$	-	$	117,585
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents mutual funds that invest in bonds from diverse industries.
(c) - This category represents an insurance contract with underlying investments that are primarily  directed by us which include equity securities and bonds from diverse industries.

Reconciliation of Level 3 fair value measurements of pension plan

The following tables set forth the reconciliation of Level 3 fair value measurements of our pension plan for the periods indicated:

	Pension Benefits
	December 31, 2011
	Insurance Contracts			Other Investments		Total
	(Thousands of dollars)
January 1, 2011	$	72,198		$	1,062	$	73,260
Purchases		-			65,000		65,000
Actual return on plan assets
held at the reporting date		(1,380	)		181		(1,199	)
December 31, 2011	$	70,818		$	66,243	$	137,061

	Pension Benefits
	December 31, 2010
	Insurance Contracts			Other Investments			Total
	(Thousands of dollars)
January 1, 2010	$	76,079		$	1,098		$	77,177
Actual return on plan assets
held at the reporting date		(3,881	)		(36	)		(3,917	)
December 31, 2010	$	72,198		$	1,062		$	73,260

Pension benefits and postretirement benefit payments expected to be paid

The following table sets forth the pension benefits and postretirement benefit payments expected to be paid in 2012-2021:

	Pension Benefits		Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2012	$	62,378	$	16,376
2013	$	64,672	$	17,023
2014	$	66,383	$	17,696
2015	$	68,726	$	18,006
2016	$	70,722	$	19,203
2017 through 2021	$	391,808	$	114,039

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CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
ONEOK 2011 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Expiration date	April 2016
Maximum debt-to-capital ratio (in hundredths)	67.50%
Current debt-to-capital ratio (in hundredths)	44.40%
Commercial paper	$ 842,000,000
Letters of credit issued	2,000,000
Remaining available borrowing capacity to meet liquidity needs	356,000,000
Initiation date	April 2011
Weighted-average interest rate on short-term debt outstanding (in hundredths)	0.50%	0.38%
Interest rate description	Borrowings, if any, will accrue at LIBOR plus 150 basis points
Maximum borrowing capacity	1,200,000,000
Option to increase borrowing capacity	1,700,000,000
Annual fee description	the annual facility fee is 25 basis points based on our current credit rating
ONEOK Credit Agreement [Member]
Line of Credit Facility [Line Items]
Expiration date	July 2011
Maximum borrowing capacity	1,200,000,000
ONEOK Partners 2011 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Expiration date	August 2016
Partnership 2011 Credit Agreement sublimit for issuance of standby letters of credit	100,000,000
Initiation date	August 2011
Weighted-average interest rate on short-term debt outstanding (in hundredths)		0.38%
Interest rate description	Borrowings, if any, will accrue at LIBOR plus 130 basis points
Debt to EBITDA covenant ratio, before amendment	5.0 to 1
Acquisition price threshold for increase in permitted debt to EBITDA covenant ratio	25,000,000
Debt to EBITDA covenant ratio, amendment	5.5 to 1
Debt to EBITDA covenant, period end	2.9 to 1
Maximum borrowing capacity	1,200,000,000
Option to increase borrowing capacity	1,700,000,000
Annual fee description	the annual facility fee is 20 basis points based on ONEOK Partners' current credit rating
ONEOK Partners Credit Agreement [Member]
Line of Credit Facility [Line Items]
Expiration date	March 2012
Maximum borrowing capacity	$ 1,000,000,000

XML

CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Revenues	$ 14,805,794	$ 12,678,791	$ 10,805,753
Cost of sales and fuel	12,425,435	10,616,621	8,807,802
Net margin	2,380,359	2,062,170	1,997,951
Operating expenses
Operations and maintenance	813,666	740,881	729,986
Depreciation and amortization	312,160	307,224	288,923
General taxes	94,657	90,032	100,974
Total operating expenses	1,220,483	1,138,137	1,119,883
Gain (loss) on sale of assets	(963)	18,619	4,806
Operating income	1,158,913	942,652	882,874
Equity earnings from investments (Note O)	127,246	101,880	72,722
Allowance for equity funds used during construction	2,335	1,018	26,868
Other income	1,410	11,527	19,730
Other expense	(9,336)	(11,067)	(14,709)
Interest expense	(297,006)	(292,232)	(300,820)
Income before income taxes	983,562	753,778	686,665
Income taxes (Note N)	(226,048)	(213,720)	(203,008)
Income from continuing operations	757,514	540,058	483,657
Income from discontinued operations, net of tax (Note B)	2,230	1,272	7,547
Net income	759,744	541,330	491,204
Less: Net income attributable to noncontrolling interests	399,150	206,698	185,753
Net income attributable to ONEOK	360,594	334,632	305,451
Amounts attributable to ONEOK:
Income from continuing operations	358,364	333,360	297,904
Income from discontinued operations	2,230	1,272	7,547
Net Income	$ 360,594	$ 334,632	$ 305,451
Basic earnings per share (Note K):
Income from continuing operations	$ 3.42	$ 3.14	$ 2.83
Income from discontinued operations	$ 0.02	$ 0.01	$ 0.07
Net Income	$ 3.44	$ 3.15	$ 2.90
Diluted earnings per share (Note K):
Income from continuing operations	$ 3.34	$ 3.09	$ 2.80
Income from discontinued operations	$ 0.02	$ 0.01	$ 0.07
Net Income	$ 3.36	$ 3.10	$ 2.87
Average shares (thousands)
Basic	104,672	106,368	105,362
Diluted	107,249	107,785	106,320
Dividends declared per share of common stock	$ 2.16	$ 1.82	$ 1.64

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SEGMENTS (Tables)

12 Months Ended

Dec. 31, 2011

SEGMENTS [Abstract]

Segments

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2011	ONEOK Partners (a)			Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	10,919,004		$	1,609,628	$	2,274,799	$	2,363		$	14,805,794
Intersegment revenues		403,603			11,706		502,418		(917,727	)		-
Total revenues	$	11,322,607		$	1,621,334	$	2,777,217	$	(915,364	)	$	14,805,794
Net margin	$	1,577,380		$	751,835	$	48,740	$	2,404		$	2,380,359
Operating costs		459,364			422,073		24,527		2,359			908,323
Depreciation and amortization		177,549			132,212		445		1,954			312,160
Gain (loss) on sale of assets		(963	)		-		-		-			(963	)
Operating income	$	939,504		$	197,550	$	23,768	$	(1,909	)	$	1,158,913
Equity earnings from investments	$	127,246		$	-	$	-	$	-		$	127,246
Investments in unconsolidated    affiliates	$	1,223,398		$	-	$	-	$	-		$	1,223,398
Total assets	$	8,946,676		$	3,392,475	$	562,728	$	794,756		$	13,696,635
Noncontrolling interests in    consolidated subsidiaries	$	5,112		$	-	$	-	$	1,556,047		$	1,561,159
Capital expenditures	$	1,063,383		$	242,590	$	41	$	30,053		$	1,336,067
(a) - Our ONEOK Partners segment has regulated and nonregulated operations. Our ONEOK Partners segment's regulated operations had revenues of $658.5 million, net margin of $469.0 million and operating income of $232.8 million.

Year Ended December 31, 2010	ONEOK Partners (a)		Natural Gas Distribution			Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	8,218,160	$	1,810,502		$	2,647,460	$	2,669		$	12,678,791
Intersegment revenues		457,740		6,900			653,717		(1,118,357	)		-
Total revenues	$	8,675,900	$	1,817,402		$	3,301,177	$	(1,115,688	)	$	12,678,791
Net margin	$	1,144,853	$	754,917		$	159,739	$	2,661		$	2,062,170
Operating costs		403,476		398,861			28,384		192			830,913
Depreciation and amortization		173,708		130,968			694		1,854			307,224
Gain (loss) on sale of assets		18,632		(13	)		-		-			18,619
Operating income	$	586,301	$	225,075		$	130,661	$	615		$	942,652
Equity earnings from investments	$	101,880	$	-		$	-	$	-		$	101,880
Investments in unconsolidated    affiliates	$	1,188,124	$	-		$	-	$	-		$	1,188,124
Total assets	$	7,920,100	$	3,237,890		$	651,960	$	689,225		$	12,499,175
Noncontrolling interests in    consolidated subsidiaries	$	5,176	$	-		$	-	$	1,467,042		$	1,472,218
Capital expenditures	$	352,714	$	215,608		$	488	$	13,938		$	582,748
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment's regulated operations had revenues of $612.2 million, net margin of $479.1 million and operating income of $250.9 million.

Year Ended December 31, 2009	ONEOK Partners (a)		Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	5,998,726	$	1,832,146	$	2,971,902	$	2,979		$	10,805,753
Intersegment revenues		475,765		6,745		581,740		(1,064,250	)		-
Total revenues	$	6,474,491	$	1,838,891	$	3,553,642	$	(1,061,271	)	$	10,805,753
Net margin	$	1,119,297	$	716,028	$	159,647	$	2,979		$	1,997,951
Operating costs		411,227		384,126		35,542		65			830,960
Depreciation and amortization		164,136		122,594		540		1,653			288,923
Gain (loss) on sale of assets		2,668		486		-		1,652			4,806
Operating income	$	546,602	$	209,794	$	123,565	$	2,913		$	882,874
Equity earnings from investments	$	72,722	$	-	$	-	$	-		$	72,722
Investments in unconsolidated    affiliates	$	765,163	$	-	$	-	$	-		$	765,163
Total assets	$	7,953,259	$	3,120,704	$	930,086	$	823,634		$	12,827,683
Noncontrolling interests in    consolidated subsidiaries	$	5,603	$	-	$	-	$	1,232,665		$	1,238,268
Capital expenditures	$	615,691	$	157,508	$	105	$	17,941		$	791,245
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment's regulated operations had revenues of $555.9 million, net margin of $451.0 million and operating income of $200.3 million.

XML

CONSOLIDATED BALANCE SHEETS Parenthetical (USD $)	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS Parenthetical [Abstract]
Common stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares, authorized (in shares)	300,000,000	300,000,000
Common stock, shares, issued (in shares)	122,904,924	122,815,636
Common stock, shares, outstanding (in shares)	103,254,980	106,815,582
Treasury stock, shares (in shares)	19,649,944	16,000,054

XML

EMPLOYEE BENEFIT PLANS (Details) (USD $)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Defined Benefit Plan Disclosure [Line Items]

Description of plan amendment

In December 2011, we announced to participants a change from a self-insured postretirement medical plan to a fully insured solution for plan participants who have reached the age of 65 that coordinates with Medicare.  This announcement resulted in a $44.6 million reduction in our accumulated postretirement benefit obligation that was recognized in other comprehensive income and will be amortized to net periodic benefit cost over the expected remaining years of service for plan participants.

Amounts recognized in other comprehensive income (loss) [Abstract]

Total recognized in other comprehensive income (loss)

$ (25,837,000)

$ (12,001,000)

$ (14,560,000)

Amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense [Abstract]

Regulatory asset for regulated entities

539,700,000

463,900,000

Accumulated other comprehensive income (loss), net of tax

(151,741,000)

(125,904,000)

(113,903,000)

Weighted average assumptions used to determine benefit obligations [Abstract]

Discount rate (in hundredths)

5.00%

5.50%

Compensation increase rate - benefit obligation - minimum (in hundredths)

3.20%

3.30%

Compensation increase rate, maximum (in hundredths)

3.80%

3.90%

Weighted-average assumptions used to determine net periodic benfit costs [Abstract]

Discount rate (in hundredths)

5.50%

6.00%

6.25%

Expected long-term return on plan assets (in hundredths)

8.25%

8.50%

8.50%

Compensation increase rate, minimum (in hundredths)

3.30%

3.10%

4.30%

Compensation increase rate, maximum (in hundredths)

3.90%

4.00%

4.80%

Description of basis used to determine overall expected long-term rate of return on plan assets

We determine our overall expected long-term rate of return on plan assets, based on our review of historical returns and economic growth models. We determine our discount rates annually. We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our pension and postretirement obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows. Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds. Bonds selected to be included in the portfolios are only those rated by Moody's as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Assumed health care cost trend rates [Abstract]

Health care cost-trend rate assumed for next year - minimum (in hundredths)

4.00%

6.00%

Health care cost-trend rate assumed for next year - maximum (in hundredths)

9.00%

9.00%

Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate) (in hundredths)

5.00%

Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate) - minimum (in hundredths)

4.00%

Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate) - maximum (in hundredths)

5.00%

Year that the rate reaches the ultimate trend rate

2021

2020

One percentage point change in assumed healthcare cost trend rates [Abstract]

Effect of a one percentage point increase on total of service and interest cost

1,833,000

Effect of a one percentage point increase on postretirement benefit obligation

17,562,000

Effect of a one percentage point decrease on total of service and interest cost

(1,559,000)

Effect of a one percentage point decrease on postretirement benefit obligation

(16,079,000)

Target allocation for assets of the pension plan [Abstract]

U.S. large-cap equities

37.00%

Aggregate bonds

24.00%

Developed foreign large-cap equities

10.00%

Alternative investments

8.00%

Mid-cap equities

6.00%

Emerging markets equities

5.00%

Small-cap equities

4.00%

High yield bonds

3.00%

Developed foreign bonds

2.00%

Emerging market bonds

1.00%

Total

100.00%

Other Employee Benefit Plans - Thrift Plan [Abstract]

Contributions made to the Thrift Plan

15,900,000

15,400,000

14,700,000

Percent of employee contributions matched of eligible compensation (in hundredths)

100.00%

Maximum percentage of each participant's eligible compensation, subject to certain limits, matching (in hundredths)

6.00%

Profit-Sharing Plan [Abstract]

Contributions made to the Profit-Sharing Plan

6,700,000

4,700,000

4,700,000

Pension Benefits [Member]

Change in Benefit Obligation [Roll Forward]

Benefit obligation, beginning of period

1,215,932,000

1,215,932,000

1,098,232,000

997,003,000

Service cost

20,013,000

19,277,000

20,762,000

Interest cost

58,757,000

58,143,000

58,052,000

Plan participants' contributions

0

0

Actuarial (gain) loss

92,609,000

75,704,000

Benefits paid

(53,679,000)

(51,895,000)

Plan amendment

0

0

Benefit obligation, end of period

1,215,932,000

1,098,232,000

997,003,000

Change in Plan Assets [Roll Forward]

Fair value of plan assets, beginning of period

902,235,000

902,235,000

904,089,000

748,686,000

Actual return on plan assets

(10,750,000)

110,473,000

Employer contributions

60,000,000

62,575,000

96,825,000

Benefits paid

(53,679,000)

(51,895,000)

Fair value of assets, end of period

902,235,000

904,089,000

748,686,000

Balance at December 31

(313,697,000)

(194,143,000)

Current liabilities

(4,545,000)

(4,203,000)

Non-current liabilities

(309,152,000)

(189,940,000)

Balance at December 31

(313,697,000)

(194,143,000)

Employer contributions for next plan year

62,600,000

57,000,000

Accumulated benefit obligation for pension plans

1,152,400,000

1,041,500,000

Components of net periodic benefit cost [Abstract]

Service cost

20,013,000

19,277,000

20,762,000

Interest cost

58,757,000

58,143,000

58,052,000

Expected return on assets

(75,500,000)

(73,651,000)

(66,034,000)

Amortization of unrecognized prior service cost

1,018,000

1,278,000

1,565,000

Amortization of net loss

35,708,000

27,555,000

17,322,000

Net periodic benefit cost

39,996,000

32,602,000

31,667,000

Amounts recognized in other comprehensive income (loss) [Abstract]

Regulatory asset gain (loss)

114,625,000

19,146,000

(4,674,000)

Net gain (loss) arising during the period

(182,987,000)

(43,055,000)

(30,340,000)

Amortization of regulatory asset

(23,265,000)

(18,359,000)

(11,465,000)

Amortization of prior service credit

1,018,000

1,278,000

1,565,000

Amortization of loss

35,708,000

27,555,000

17,322,000

Deferred income taxes

21,236,000

5,197,000

10,674,000

Total recognized in other comprehensive income (loss)

(33,665,000)

(8,238,000)

(16,918,000)

Amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense [Abstract]

Transition obligation

0

0

0

Prior service credit (cost)

969,000

(2,991,000)

(4,009,000)

Accumulated gain (loss)

(630,886,000)

(483,607,000)

Accumulated other comprehensive income (loss) before regulatory assets

(633,877,000)

(487,616,000)

Regulatory asset for regulated entities

407,886,000

316,527,000

Accumulated other comprehensive income (loss) after regulatory assets

(225,991,000)

(171,089,000)

Deferred income taxes

87,413,000

66,180,000

Accumulated other comprehensive income (loss), net of tax

(138,578,000)

(104,909,000)

Amounts to be recognized in 2012 [Abstract]

Prior service credit (cost)

1,018,000

1,278,000

1,565,000

Net loss

48,439,000

Level 3 fair value measurements [Roll Forward]

Balance at beginning of period

137,061,000

137,061,000

73,260,000

77,177,000

Purchases

65,000,000

Actual return on plan assets held at the reporting date

(1,199,000)

(3,917,000)

Balance at end of period

137,061,000

73,260,000

77,177,000

Benefits to be paid in: [Abstract]

2012

62,378,000

2013

64,672,000

2014

66,383,000

2015

68,726,000

2016

70,722,000

2017 through 2021

391,808,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

902,235,000

904,089,000

748,686,000

Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

577,381,000

701,397,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

577,381,000

701,397,000

Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

187,793,000

129,432,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

187,793,000

129,432,000

Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

137,061,000

73,260,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

137,061,000

73,260,000

Pension Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

902,235,000

904,089,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

902,235,000

904,089,000

Pension Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

18,835,000

26,439,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

18,835,000

26,439,000

Pension Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

58,977,000

49,199,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

58,977,000

49,199,000

Pension Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Corporate Obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

77,812,000

75,638,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

77,812,000

75,638,000

Pension Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member]

Level 3 fair value measurements [Roll Forward]

Balance at beginning of period

76,079,000

Purchases

0

Actual return on plan assets held at the reporting date

(1,380,000)

(3,881,000)

Pension Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

70,818,000

72,198,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

70,818,000

72,198,000

Pension Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

70,818,000

72,198,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

70,818,000

72,198,000

Pension Benefits [Member] | Other Investments [Member]

Level 3 fair value measurements [Roll Forward]

Balance at beginning of period

1,098,000

Purchases

65,000,000

Actual return on plan assets held at the reporting date

181,000

(36,000)

Pension Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

66,243,000

1,062,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

66,243,000

1,062,000

Pension Benefits [Member] | Other Investments [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

66,243,000

1,062,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

66,243,000

1,062,000

Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

481,971,000

588,224,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

481,971,000

588,224,000

Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

32,475,000

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

32,475,000

0

Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

514,446,000

588,224,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

514,446,000

588,224,000

Pension Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

96,341,000

80,233,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

96,341,000

80,233,000

Pension Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Government Obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

96,341,000

80,233,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

96,341,000

80,233,000

Pension Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

76,575,000

86,734,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

76,575,000

86,734,000

Pension Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Pension Benefits [Member] | Cash and Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

76,575,000

86,734,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

76,575,000

86,734,000

Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Minimum number of years of service for certain employees to be eligible to participate in welfare plans that provide postretirement medical and life insurance benefits

Five

Change in Benefit Obligation [Roll Forward]

Benefit obligation, beginning of period

286,044,000

286,044,000

295,483,000

267,666,000

Service cost

4,987,000

4,926,000

5,173,000

Interest cost

15,632,000

15,643,000

16,918,000

Plan participants' contributions

6,751,000

3,048,000

Actuarial (gain) loss

25,617,000

20,761,000

Benefits paid

(17,864,000)

(16,561,000)

Plan amendment

(44,562,000)

0

Benefit obligation, end of period

286,044,000

295,483,000

267,666,000

Change in Plan Assets [Roll Forward]

Fair value of plan assets, beginning of period

124,163,000

124,163,000

117,585,000

92,360,000

Actual return on plan assets

(4,876,000)

12,677,000

Employer contributions

11,454,000

12,548,000

Benefits paid

0

0

Fair value of assets, end of period

124,163,000

117,585,000

92,360,000

Balance at December 31

(161,881,000)

(177,898,000)

Current liabilities

0

0

Non-current liabilities

(161,881,000)

(177,898,000)

Balance at December 31

(161,881,000)

(177,898,000)

Components of net periodic benefit cost [Abstract]

Service cost

4,987,000

4,926,000

5,173,000

Interest cost

15,632,000

15,643,000

16,918,000

Expected return on assets

(10,272,000)

(7,896,000)

(6,809,000)

Amortization of unrecognized net asset at adoption

3,189,000

3,189,000

3,189,000

Amortization of unrecognized prior service cost

(2,518,000)

(2,003,000)

(2,003,000)

Amortization of net loss

8,123,000

7,009,000

9,660,000

Net periodic benefit cost

19,141,000

20,868,000

26,128,000

Amounts recognized in other comprehensive income (loss) [Abstract]

Regulatory asset gain (loss)

7,389,000

8,408,000

(19,292,000)

Net gain (loss) arising during the period

(40,765,000)

(15,980,000)

21,692,000

Amortization of regulatory asset

(7,214,000)

(6,759,000)

(9,400,000)

Amortization of transition obligation

3,189,000

3,189,000

3,189,000

Amortization of prior service credit

(2,518,000)

(2,003,000)

(2,003,000)

Amortization of loss

8,123,000

7,009,000

9,660,000

Deferred income taxes

(4,938,000)

2,373,000

(1,488,000)

Plan amendment

44,562,000

0

0

Total recognized in other comprehensive income (loss)

7,828,000

(3,763,000)

2,358,000

Amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense [Abstract]

Transition obligation

2,874,000

3,157,000

6,346,000

Prior service credit (cost)

(8,252,000)

46,426,000

4,377,000

Accumulated gain (loss)

(123,489,000)

(90,846,000)

Accumulated other comprehensive income (loss) before regulatory assets

(80,220,000)

(92,815,000)

Regulatory asset for regulated entities

58,752,000

58,577,000

Accumulated other comprehensive income (loss) after regulatory assets

(21,468,000)

(34,238,000)

Deferred income taxes

8,305,000

13,243,000

Accumulated other comprehensive income (loss), net of tax

(13,163,000)

(20,995,000)

Amounts to be recognized in 2012 [Abstract]

Transition obligation

3,189,000

3,189,000

3,189,000

Prior service credit (cost)

(2,518,000)

(2,003,000)

(2,003,000)

Net loss

13,184,000

Benefits to be paid in: [Abstract]

2012

16,376,000

2013

17,023,000

2014

17,696,000

2015

18,006,000

2016

19,203,000

2017 through 2021

114,039,000

Contributions for next fiscal year [Abstract]

Anticipated total contributions in the next fiscal year

10,700,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

124,163,000

117,585,000

92,360,000

Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

46,548,000

42,024,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

46,548,000

42,024,000

Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

77,385,000

75,561,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

77,385,000

75,561,000

Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

230,000

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

230,000

0

Postretirement Benefits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

124,163,000

117,585,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

124,163,000

117,585,000

Postretirement Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

12,156,000

12,149,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

12,156,000

12,149,000

Postretirement Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

205,000

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

205,000

0

Postretirement Benefits [Member] | Corporate Obligations [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Corporate Obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

12,361,000

12,149,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

12,361,000

12,149,000

Postretirement Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

76,733,000

75,561,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

76,733,000

75,561,000

Postretirement Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Insurance Contracts and Group Annuity Contracts [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

76,733,000

75,561,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

76,733,000

75,561,000

Postretirement Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

Postretirement Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

Postretirement Benefits [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

230,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

230,000

Postretirement Benefits [Member] | Other Investments [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

230,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

230,000

Postretirement Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

21,915,000

17,261,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

21,915,000

17,261,000

Postretirement Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

113,000

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

113,000

0

Postretirement Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

22,028,000

17,261,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

22,028,000

17,261,000

Postretirement Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

Postretirement Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

334,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

334,000

Postretirement Benefits [Member] | Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

Postretirement Benefits [Member] | Government Obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

334,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

334,000

Postretirement Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

12,477,000

12,614,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

12,477,000

12,614,000

Postretirement Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Cash and Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

0

0

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

0

0

Postretirement Benefits [Member] | Cash and Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Change in Plan Assets [Roll Forward]

Fair value of assets, end of period

12,477,000

12,614,000

Target allocation for assets of the pension plan [Abstract]

Fair Value of Assets

$ 12,477,000

$ 12,614,000

XML

LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2011

LONG-TERM DEBT [Abstract]

Long-Term Debt

All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.  The following table sets forth our long-term debt for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
ONEOK
$400,000 at 7.125% due 2011	$	-		$	400,000
$400,000 at 5.2% due 2015		400,000			400,000
$100,000 at 6.4% due 2019		-			90,091
$100,000 at 6.5% due 2028		87,735			87,971
$100,000 at 6.875% due 2028		100,000			100,000
$400,000 at 6.0% due 2035		400,000			400,000
Other		1,858			2,163
Total ONEOK senior notes payable		989,593			1,480,225
ONEOK Partners
$225,000 at 7.10% due 2011		-			225,000
$350,000 at 5.90% due 2012		350,000			350,000
$650,000 at 3.25% due 2016		650,000			-
$450,000 at 6.15% due 2016		450,000			450,000
$500,000 at 8.625% due 2019		500,000			500,000
$600,000 at 6.65% due 2036		600,000			600,000
$600,000 at 6.85% due 2037		600,000			600,000
$650,000 at 6.125% due 2041		650,000			-
Guardian Pipeline
Average 7.85%, due 2022		85,919			97,850
Total ONEOK Partners senior notes payable		3,885,919			2,822,850
Total long-term notes payable		4,875,512			4,303,075
Unamortized portion of terminated swaps		28,776			33,113
Unamortized debt discount		(10,346	)		(6,410	)
Current maturities		(364,391	)		(643,236	)
Long-term debt	$	4,529,551		$	3,686,542

Aggregate maturities of long-term debt outstanding

The aggregate maturities of long-term debt outstanding for the years 2012 through 2016 are shown below:

			ONEOK		Guardian
	ONEOK		Partners		Pipeline			Total
		(Millions of dollars)
2012	$	3.3	$	350.0	$	11.1	$	364.4
2013	$	3.2	$	-	$	7.7	$	10.9
2014	$	3.0	$	-	$	7.7	$	10.7
2015	$	403.0	$	-	$	7.7	$	410.7
2016	$	3.0	$	1,100.0	$	7.7	$	1,110.7

XML

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Revenues	$ 4,071,037	$ 3,529,359	$ 3,444,798	$ 3,760,600	$ 3,280,050	$ 2,877,849	$ 2,740,689	$ 3,780,203	$ 14,805,794	$ 12,678,791	$ 10,805,753
Net margin	699,025	532,624	518,833	629,877	542,009	449,504	455,558	615,099	2,380,359	2,062,170	1,997,951
Income from continuing operations	263,741	161,158	134,330	198,285	148,675	120,005	86,146	185,232	757,514	540,058	483,657
Income (loss) from operations of discontinued components, net	1,010	(278)	437	1,061	(740)	296	228	1,488	2,230	1,272	7,547
Net income	264,751	160,880	134,767	199,346	147,935	120,301	86,374	186,720	759,744	541,330	491,204
Net income attributable to ONEOK	$ 115,001	$ 60,321	$ 55,142	$ 130,130	$ 83,074	$ 55,295	$ 41,724	$ 154,539	$ 360,594	$ 334,632	$ 305,451
Earnings per share from continuing operations
Basic (in dollars per share)	$ 1.12	$ 0.58	$ 0.52	$ 1.22	$ 0.78	$ 0.52	$ 0.39	$ 1.46	$ 3.42	$ 3.14	$ 2.83
Diluted (in dollars per share)	$ 1.09	$ 0.57	$ 0.51	$ 1.19	$ 0.76	$ 0.51	$ 0.39	$ 1.44	$ 3.34	$ 3.09	$ 2.80

XML

EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2011

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

M.           EMPLOYEE BENEFIT PLANS

Retirement and Postretirement Benefit Plans

Retirement Plans - We have a defined benefit pension plan covering nonbargaining unit employees hired prior to January 1, 2005, and certain bargaining unit employees.  Nonbargaining unit employees hired after December 31, 2004, employees represented by Local No. 304 of the IBEW hired on or after July 1, 2010, employees represented by the United Steelworkers hired on or after December 15, 2011, and employees who accepted a one-time opportunity to opt out of our pension plan, are covered by a profit-sharing plan.  In addition, we have a supplemental executive retirement plan for the benefit of certain officers.  No new participants in our supplemental executive retirement plan have been approved since 2005.  We fund our pension costs at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended, and the Pension Protection Act of 2006.

Postretirement Benefit Plans - We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  The postretirement medical plan is contributory based on hire date, age and years of service, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance.

In December 2011, we announced to participants a change from a self-insured postretirement medical plan to a fully insured solution for plan participants who have reached the age of 65 that coordinates with Medicare.  This announcement resulted in a $44.6 million reduction in our accumulated postretirement benefit obligation that was recognized in other comprehensive income and will be amortized to net periodic benefit cost over the expected remaining years of service for plan participants.

Regulatory Treatment - The OCC, KCC and regulatory authorities in Texas have approved the recovery of pension costs and postretirement benefits costs through rates for Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively.  The costs recovered through rates are based on current funding requirements and the net periodic benefit cost for pension and postretirement costs.  Differences, if any, between the expense and the amount recovered through rates are reflected in earnings, net of authorized deferrals.

Our regulated entities historically have recovered pension and postretirement benefit costs through rates.  We believe it is probable that regulators will continue to include the net periodic pension and postretirement benefit costs in our regulated entities' cost of service.  Accordingly, we have recorded a regulatory asset for the minimum liability associated with our regulated entities' pension and postretirement benefit obligations that otherwise would have been recorded in accumulated other comprehensive income.

Obligations and Funded Status - The following tables set forth our pension and postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated.

	Pension Benefits								Postretirement Benefits
	December 31,								December 31,
	2011				2010				2011			2010
Change in Benefit Obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	1,098,232			$	997,003			$	295,483		$	267,666
Service cost		20,013				19,277				4,987			4,926
Interest cost		58,757				58,143				15,632			15,643
Plan participants' contributions		-				-				6,751			3,048
Actuarial (gain) loss		92,609				75,704				25,617			20,761
Benefits paid		(53,679	)			(51,895	)			(17,864	)		(16,561	)
Plan amendment		-				-				(44,562	)		-
Benefit obligation, end of period		1,215,932				1,098,232				286,044			295,483
Change in Plan Assets
Fair value of plan assets, beginning of period		904,089				748,686				117,585			92,360
Actual return on plan assets		(10,750	)			110,473				(4,876	)		12,677
Employer contributions		62,575		(a)		96,825		(b)		11,454			12,548
Benefits paid		(53,679	)			(51,895	)			-			-
Fair value of assets, end of period		902,235				904,089				124,163			117,585
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
Current liabilities	$	(4,545	)		$	(4,203	)		$	-		$	-
Non-current liabilities		(309,152	)			(189,940	)			(161,881	)		(177,898	)
Balance at December 31	$	(313,697	)		$	(194,143	)		$	(161,881	)	$	(177,898	)
(a) - Includes $62.6 million contributed for the 2012 plan year.
(b) - Includes $57.0 million contributed for the 2011 plan year.

The accumulated benefit obligation for our pension plans was $1,152.4 million and $1,041.5 million at December 31, 2011 and 2010, respectively.

There are no plan assets expected to be withdrawn and returned to us in 2012.

Components of Net Periodic Benefit Cost -The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	20,013		$	19,277		$	20,762
Interest cost		58,757			58,143			58,052
Expected return on assets		(75,500	)		(73,651	)		(66,034	)
Amortization of unrecognized prior service cost		1,018			1,278			1,565
Amortization of net loss		35,708			27,555			17,322
Net periodic benefit cost	$	39,996		$	32,602		$	31,667

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	4,987		$	4,926		$	5,173
Interest cost		15,632			15,643			16,918
Expected return on assets		(10,272	)		(7,896	)		(6,809	)
Amortization of unrecognized net asset at adoption		3,189			3,189			3,189
Amortization of unrecognized prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of net loss		8,123			7,009			9,660
Net periodic benefit cost	$	19,141		$	20,868		$	26,128

Other Comprehensive Income (Loss) - The following tables set forth the amounts recognized in other comprehensive income (loss) related to our pension benefits and postretirement benefits for the periods indicated:

	Pension Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	114,625		$	19,146		$	(4,674	)
Net loss arising during the period		(182,987	)		(43,055	)		(30,340	)
Amortization of regulatory asset		(23,265	)		(18,359	)		(11,465	)
Amortization of prior service credit		1,018			1,278			1,565
Amortization of loss		35,708			27,555			17,322
Deferred income taxes		21,236			5,197			10,674
Total recognized in other comprehensive income (loss)	$	(33,665	)	$	(8,238	)	$	(16,918	)

	Postretirement Benefits
	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Regulatory asset gain (loss)	$	7,389		$	8,408		$	(19,292	)
Net gain (loss) arising during the period		(40,765	)		(15,980	)		21,692
Amortization of regulatory asset		(7,214	)		(6,759	)		(9,400	)
Amortization of transition obligation		3,189			3,189			3,189
Amortization of prior service cost		(2,518	)		(2,003	)		(2,003	)
Amortization of loss		8,123			7,009			9,660
Plan amendment		44,562			-			-
Deferred income taxes		(4,938	)		2,373			(1,488	)
Total recognized in other comprehensive income (loss)	$	7,828		$	(3,763	)	$	2,358

The table below sets forth the amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Pension Benefits						Postretirement Benefits
	December 31,						December 31,
	2011			2010			2011			2010
	(Thousands of dollars)
Transition obligation	$	-		$	-		$	(3,157	)	$	(6,346	)
Prior service credit (cost)		(2,991	)		(4,009	)		46,426			4,377
Accumulated gain (loss)		(630,886	)		(483,607	)		(123,489	)		(90,846	)
Accumulated other comprehensive income (loss)      before regulatory assets		(633,877	)		(487,616	)		(80,220	)		(92,815	)
Regulatory asset for regulated entities		407,886			316,527			58,752			58,577
Accumulated other comprehensive income (loss)      after regulatory assets		(225,991	)		(171,089	)		(21,468	)		(34,238	)
Deferred income taxes		87,413			66,180			8,305			13,243
Accumulated other comprehensive income (loss),      net of tax	$	(138,578	)	$	(104,909	)	$	(13,163	)	$	(20,995	)

The following table sets forth the amounts recognized in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense in the next fiscal year:

	Pension		Postretirement
	Benefits		Benefits
Amounts to be recognized in 2012	(Thousands of dollars)
Transition obligation	$	-	$	2,874
Prior service credit (cost)	$	969	$	(8,252	)
Net loss	$	48,439	$	13,184

Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postretirement benefits for the periods indicated:

	Years Ended
	December 31,
	2011	2010
Discount rate	5.00%	5.50%
Compensation increase rate	3.2% - 3.8%	3.3% - 3.9%

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended
	December 31,
	2011	2010		2009
Discount rate	5.50%		6.00%		6.25%
Expected long-term return on plan assets	8.25%		8.50%		8.50%
Compensation increase rate	3.30% - 3.90%		3.1% - 4.0%		4.3% - 4.8%

We determine our overall expected long-term rate of return on plan assets, based on our review of historical returns and economic growth models.

We determine our discount rates annually.  We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our pension and postretirement obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows.  Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds.  Bonds selected to be included in the portfolios are only those rated by Moody's as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Health Care Cost Trend Rates -The following table sets forth the assumed health care cost trend rates for the periods indicated:

	2011		2010
Health care cost-trend rate assumed for next year		4.0% - 9.0%		6.0% - 9.0%
Rate to which the cost-trend rate is assumed
to decline (the ultimate trend rate)		4.0% - 5.0%		5.0%
Year that the rate reaches the ultimate trend rate		2021		2020

Assumed health care cost trend rates have a significant effect on the amounts reported for our health care plans.  A one percentage point change in assumed health care cost trend rates would have the following effects:

	One Percentage		One Percentage
	Point Increase		Point Decrease
	(Thousands of dollars)
Effect on total of service and interest cost	$	1,833	$	(1,559	)
Effect on postretirement benefit obligation	$	17,562	$	(16,079	)

Plan Assets -Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals.  The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan's current and projected financial obligations.  The plan's investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, insurance contracts and venture capital.  The target allocation for the assets of our pension plan is as follows:

U.S. large-cap equities	37%
Aggregate bonds	24%
Developed foreign large-cap equities	10%
Alternative investments	8%
Mid-cap equities	6%
Emerging markets equities	5%
Small-cap equities	4%
High yield bonds	3%
Developed foreign bonds	2%
Emerging market bonds	1%
Total	100%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.  All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock.

The following tables set forth our pension benefits and postretirement benefits plan assets by category as of the measurement date:

	Pension Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	481,971	$	32,475	$	-	$	514,446
Government obligations		-		96,341		-		96,341
Corporate obligations (b)		18,835		58,977		-		77,812
Cash and money market funds (c)		76,575		-		-		76,575
Insurance contracts and group annuity contracts		-		-		70,818		70,818
Other investments (d)		-		-		66,243		66,243
Total assets	$	577,381	$	187,793	$	137,061	$	902,235
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Pension Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	588,224	$	-	$	-	$	588,224
Government obligations		-		80,233		-		80,233
Corporate obligations (b)		26,439		49,199		-		75,638
Cash and money market funds (c)		86,734		-		-		86,734
Insurance contracts and group annuity contracts		-		-		72,198		72,198
Other investments (d)		-		-		1,062		1,062
Total assets	$	701,397	$	129,432	$	73,260	$	904,089
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2011
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	21,915	$	113	$	-	$	22,028
Government obligations		-		334		-		334
Corporate obligations (b)		12,156		205		-		12,361
Cash and money market funds (c)		12,477		-		-		12,477
Insurance contracts and group annuity contracts		-		76,733		-		76,733
Other investments (d)		-		-		230		230
Total assets	$	46,548	$	77,385	$	230	$	124,163
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments.

	Postretirement Benefits
	December 31, 2010
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,261	$	-	$	-	$	17,261
Corporate obligations (b)		12,149		-		-		12,149
Cash and money market funds (c)		12,614		-		-		12,614
Insurance contracts and group annuity contracts		-		75,561		-		75,561
Total assets	$	42,024	$	75,561	$	-	$	117,585
(a) - This category represents securities of the respective market sector from diverse industries.
(b) - This category represents mutual funds that invest in bonds from diverse industries.
(c) - This category represents an insurance contract with underlying investments that are primarily  directed by us which include equity securities and bonds from diverse industries.

The following tables set forth the reconciliation of Level 3 fair value measurements of our pension plan for the periods indicated:

	Pension Benefits
	December 31, 2011
	Insurance Contracts			Other Investments		Total
	(Thousands of dollars)
January 1, 2011	$	72,198		$	1,062	$	73,260
Purchases		-			65,000		65,000
Actual return on plan assets
held at the reporting date		(1,380	)		181		(1,199	)
December 31, 2011	$	70,818		$	66,243	$	137,061

	Pension Benefits
	December 31, 2010
	Insurance Contracts			Other Investments			Total
	(Thousands of dollars)
January 1, 2010	$	76,079		$	1,098		$	77,177
Actual return on plan assets
held at the reporting date		(3,881	)		(36	)		(3,917	)
December 31, 2010	$	72,198		$	1,062		$	73,260

Contributions -During 2011, we made contributions of $62.6 million and $11.5 million to our defined benefit pension plans and postretirement benefit plans, respectively.  The contributions to our defined benefit pension plan were attributable to the 2012 plan year.  During the first quarter of 2012, we made a contribution of $60.0 million to our defined benefit pension plan; we do not anticipate that we will be required to make additional material defined benefit pension plan contributions attributable to the 2013 plan year in 2012.  We anticipate our additional 2012 contributions will include $10.7 million for our postretirement benefit plans.

Pension and Postretirement Benefit Payments - Benefit payments for our pension and postretirement benefit plans for the period ending December 31, 2011, were $53.7 million and $17.9 million, respectively.  The following table sets forth the pension benefits and postretirement benefit payments expected to be paid in 2012-2021:

	Pension Benefits		Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2012	$	62,378	$	16,376
2013	$	64,672	$	17,023
2014	$	66,383	$	17,696
2015	$	68,726	$	18,006
2016	$	70,722	$	19,203
2017 through 2021	$	391,808	$	114,039

The expected benefits to be paid are based on the same assumptions used to measure our benefit obligation at December 31, 2011, and include estimated future employee service.

Other Employee Benefit Plans

Thrift Plan - We have a Thrift Plan covering all full-time employees, and employee contributions are discretionary.  We match 100 percent of employee contributions up to 6 percent of each participant's eligible compensation, subject to certain limits.  Our contributions made to the plan were $15.9 million, $15.4 million and $14.7 million in 2011, 2010 and 2009, respectively.

Profit-Sharing Plan - We have a profit-sharing plan for all nonbargaining unit employees hired after December 31, 2004, and employees covered by the IBEW collective bargaining agreement hired after June 30, 2010.  Nonbargaining unit employees who were employed prior to January 1, 2005, and employees covered by the IBEW collective bargaining agreement employed prior to July 1, 2010, were given a one-time opportunity to make an irrevocable election to participate in the profit-sharing plan and not accrue any additional benefits under our defined-benefit pension plan after December 31, 2004 and June 30, 2010, respectively.  Employees covered by the United Steelworker collective bargaining agreement employed prior to December 16, 2011, were given a one-time opportunity to make an irrevocable election to participate in the profit-sharing plan.  We plan to make a contribution to the profit-sharing plan each quarter equal to 1 percent of each participant's eligible compensation during the quarter.  Additional discretionary employer contributions may be made at the end of each year.  Employee contributions are not allowed under the plan.  Our contributions made to the plan were $6.7 million, $4.7 million and $4.7 million in 2011, 2010 and 2009, respectively.

Employee Deferred Compensation Plan -The ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan provides select employees, as approved by our Board of Directors, with the option to defer portions of their compensation and provides nonqualified deferred compensation benefits that are not available due to limitations on employer and employee contributions to qualified defined contribution plans under the federal tax laws.  Our contributions made to the plan were not material in 2011, 2010 and 2009.

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EQUITY (Tables)

12 Months Ended

Dec. 31, 2011

EQUITY [Abstract]

Quarterly dividends per share paid on common stock

Dividends - Dividends paid totaled $227.0 million, $193.5 million and $172.8 million for 2011, 2010 and 2009, respectively.  The following table sets forth the quarterly dividends per share declared and paid on our common stock for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
First Quarter	$	0.52	$	0.44	$	0.40
Second Quarter	$	0.52	$	0.44	$	0.40
Third Quarter	$	0.56	$	0.46	$	0.42
Fourth Quarter	$	0.56	$	0.48	$	0.42
Total	$	2.16	$	1.82	$	1.64

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UNCONSOLIDATED AFFILIATES

12 Months Ended

Dec. 31, 2011

UNCONSOLIDATED AFFILIATES [Abstract]

UNCONSOLIDATED AFFILIATES

O.           UNCONSOLIDATED AFFILIATES

Northern Border Pipeline - The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline's partners are to be made on a pro rata basis according to each partner's percentage interest.  The Northern Border Pipeline Management Committee determines the amount and timing of such distributions.  Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee.  Cash distributions are equal to 100 percent of distributable cash flow as determined from Northern Border Pipeline's financial statements based upon EBITDA less interest expense and maintenance capital expenditures.  Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement.  The Northern Border Pipeline Management Committee has adopted a cash distribution policy related to financial ratio targets and capital contributions.  The cash distribution policy defines minimum equity-to- total-capitalization ratios to be used by the Northern Border Pipeline Management Committee to establish the timing and amount of required capital contributions.  In addition, any shortfall due to the inability to refinance maturing debt will be funded by capital contributions.

During 2011, ONEOK Partners made equity contributions to Northern Border Pipeline Company totaling approximately $54.8 million.

Overland Pass Pipeline Company - In September 2010, ONEOK Partners completed a transaction to sell a 49-percent ownership interest in Overland Pass Pipeline Company to a subsidiary of Williams Partners, resulting in each joint-venture member now owning 50 percent of Overland Pass Pipeline Company.  In accordance with the joint-venture agreement, ONEOK Partners received approximately $423.7 million in cash at closing.  As a result of the transaction, ONEOK Partners no longer controls Overland Pass Pipeline Company and began accounting for the investment under the equity method of accounting in September 2010.  In connection with the deconsolidation of Overland Pass Pipeline Company, ONEOK Partners recognized approximately $16.3 million in gain on sale of assets, primarily attributable to the remeasurement of its retained investment in Overland Pass Pipeline Company to its fair value, and has recorded its retained investment of approximately $438 million in investments in unconsolidated affiliates.  The estimate of the fair value of ONEOK Partners' retained interest in Overland Pass Pipeline Company was based upon the income and market valuation approaches.

The Overland Pass Pipeline Company limited liability company agreement provides that distributions to Overland Pass Pipeline Company's members are to be made on a pro rata basis according to each member's percentage interest.  The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions.  Any changes to, or suspensions of, cash distributions from Overland Pass Pipeline Company requires the unanimous approval of the Overland Pass Pipeline Management Committee.  Cash distributions are equal to 100 percent of available cash as defined in the limited liability company agreement.

Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest
			December 31,		December 31,
			2011		2010
			(Thousands of dollars)
Northern Border Pipeline	50%	$	416,206	$	384,011
Overland Pass Pipeline Company	50%		447,449		443,392
Fort Union Gas Gathering, L.L.C.	37%		117,353		115,148
Bighorn Gas Gathering, L.L.C.	49%		91,748		92,659
Other	Various		150,642		152,914
Investments in unconsolidated affiliates (a)		$	1,223,398	$	1,188,124
(a) - Equity method goodwill (Note A) was $185.6 million at December 31, 2011 and 2010.

Equity Earnings from Investments -The following table sets forth our equity earnings from investments for the periods indicated.  All amounts in the table below are equity earnings from investments in our ONEOK Partners segment:

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Northern Border Pipeline	$	76,365	$	68,124	$	41,300
Overland Pass Pipeline Company (a)		19,535		5,421		-
Fort Union Gas Gathering, L.L.C.		15,280		14,367		14,533
Bighorn Gas Gathering, L.L.C.		5,990		5,495		7,807
Other		10,076		8,473		9,082
Equity earnings from investments	$	127,246	$	101,880	$	72,722
(a) - Beginning in September 2010, following the sale of a 49-percent interest, Overland Pass Pipeline Company was deconsolidated and prospectively accounted for under the equity method.

Unconsolidated Affiliates Financial Information - The following tables set forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Balance Sheet
Current assets	$	133,579		$	93,698
Property, plant and equipment, net	$	2,451,798		$	2,500,708
Other noncurrent assets	$	35,548		$	28,222
Current liabilities	$	76,355		$	74,969
Long-term debt	$	534,485		$	616,210
Other noncurrent liabilities	$	15,510		$	13,773
Accumulated other comprehensive income (loss)	$	(2,700	)	$	(2,883	)
Owners' equity	$	1,997,275		$	1,920,559

	Years Ended December 31,
	2011		2010		2009
	(Thousands of dollars)
Income Statement (a)
Operating revenues	$	496,158	$	440,826	$	383,625
Operating expenses	$	221,261	$	189,437	$	178,194
Net income	$	249,559	$	223,715	$	164,002
Distributions paid to us	$	156,385	$	114,805	$	109,807
(a) - Financial information for 2011 is not directly comparable with 2010 and 2009 due to the deconsolidation of Overland Pass Pipeline Company in September 2010.

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net income	$ 759,744	$ 541,330	$ 491,204
Depreciation and amortization	312,288	307,317	288,991
Allowance for equity funds used during construction	(2,335)	(1,018)	(26,868)
Loss (gain) on sale of assets	963	(18,619)	(4,806)
Equity earnings from investments	(127,246)	(101,880)	(72,722)
Distributions received from unconsolidated affiliates	132,741	96,958	75,377
Deferred income taxes	256,688	142,303	198,713
Share-based compensation expense	66,371	24,372	23,148
Other	(1,471)	4,153	1,216
Changes in assets and liabilities:
Accounts receivable	(55,861)	92,469	(181,426)
Gas and natural gas liquids in storage	65,845	(164,722)	266,674
Accounts payable	102,621	(43,883)	154,039
Commodity imbalances, net	(54,886)	(15,316)	77,174
Energy marketing and risk management assets and liabilities	(31,999)	112,827	113,540
Fair value of firm commitments	(22,252)	(105,084)	176,799
Pension and postretirement benefits	(29,863)	(68,719)	(42,040)
Other assets and liabilities	(11,376)	31,554	(86,319)
Cash provided by operating activities	1,359,972	834,042	1,452,694
Investing Activities
Capital expenditures (less allowance for equity funds used during construction)	(1,336,067)	(582,748)	(791,245)
Contributions to unconsolidated affiliates	(64,491)	(1,331)	(46,461)
Distributions received from unconsolidated affiliates	23,644	17,847	34,430
Proceeds from sale of assets	1,288	428,908	10,982
Other	4,000	2,968	4,500
Cash used in investing activities	(1,371,626)	(134,356)	(787,794)
Financing Activities
Borrowing (repayment) of notes payable, net	285,127	(325,015)	(518,130)
Repayment of notes payable with maturities over 90 days	0	0	(870,000)
Issuance of debt, net of discounts	1,295,450	0	498,325
Long-term debt financing costs	(10,986)	0	(4,000)
Payment of debt	(727,562)	(262,715)	(114,975)
Repurchase of common stock	(300,108)	(7)	(254)
Issuance of common stock	17,906	20,912	17,317
Issuance of common units, net of discounts	0	322,701	241,642
Dividends paid	(227,020)	(193,542)	(172,774)
Distributions to noncontrolling interests	(277,375)	(260,385)	(222,710)
Cash provided by (used in) financing activities	55,432	(698,051)	(1,145,559)
Change in cash and cash equivalents	43,778	1,635	(480,659)
Change in cash and cash equivalents included in discontinued operations	(8,166)	(2,211)	15,558
Change in cash and cash equivalents from continuing operations	35,612	(576)	(465,101)
Cash and cash equivalents at beginning of period	30,341	30,917	496,018
Cash and cash equivalents at end of period	65,953	30,341	30,917
Supplemental cash flow information:
Cash paid for interest, net of amounts capitalized	278,162	298,354	314,509
Cash paid (refunds received) for income taxes	$ (68,696)	$ 16,841	$ 30,560

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 759,744	$ 541,330	$ 491,204
Other comprehensive income (loss), net of tax
Unrealized gain (losses) on energy marketing and risk management assets/liabilities, net of tax of $(8,670), $(43,039) and $(26,488), respectively	(19,828)	85,623	24,455
Realized gains in net income, net of tax of $53,714, $29,278 and $48,059, respectively	(84,025)	(48,117)	(104,549)
Unrealized holding gains (losses) on available-for-sale securities, net of tax of $242, $44 and $(396), respectively	(384)	(70)	627
Change in pension and postretirement benefit plan liability, net of tax of $16,298, $7,570 and $9,186, respectively	(25,837)	(12,001)	(14,560)
Other, net of tax of $50, $(45) and $(84), respectively	(79)	71	244
Total other comprehensive income (loss), net of tax	(130,153)	25,506	(93,783)
Comprehensive income	629,591	566,836	397,421
Less: Comprehensive income attributable to noncontrolling interests	366,316	222,393	139,967
Comprehensive income attributable to ONEOK	$ 263,275	$ 344,443	$ 257,454

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LONG-TERM DEBT

12 Months Ended

Dec. 31, 2011

LONG-TERM DEBT [Abstract]

LONG-TERM DEBT

H.           LONG-TERM DEBT

All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.  The following table sets forth our long-term debt for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
ONEOK
$400,000 at 7.125% due 2011	$	-		$	400,000
$400,000 at 5.2% due 2015		400,000			400,000
$100,000 at 6.4% due 2019		-			90,091
$100,000 at 6.5% due 2028		87,735			87,971
$100,000 at 6.875% due 2028		100,000			100,000
$400,000 at 6.0% due 2035		400,000			400,000
Other		1,858			2,163
Total ONEOK senior notes payable		989,593			1,480,225
ONEOK Partners
$225,000 at 7.10% due 2011		-			225,000
$350,000 at 5.90% due 2012		350,000			350,000
$650,000 at 3.25% due 2016		650,000			-
$450,000 at 6.15% due 2016		450,000			450,000
$500,000 at 8.625% due 2019		500,000			500,000
$600,000 at 6.65% due 2036		600,000			600,000
$600,000 at 6.85% due 2037		600,000			600,000
$650,000 at 6.125% due 2041		650,000			-
Guardian Pipeline
Average 7.85%, due 2022		85,919			97,850
Total ONEOK Partners senior notes payable		3,885,919			2,822,850
Total long-term notes payable		4,875,512			4,303,075
Unamortized portion of terminated swaps		28,776			33,113
Unamortized debt discount		(10,346	)		(6,410	)
Current maturities		(364,391	)		(643,236	)
Long-term debt	$	4,529,551		$	3,686,542

The aggregate maturities of long-term debt outstanding for the years 2012 through 2016 are shown below:

			ONEOK		Guardian
	ONEOK		Partners		Pipeline			Total
		(Millions of dollars)
2012	$	3.3	$	350.0	$	11.1	$	364.4
2013	$	3.2	$	-	$	7.7	$	10.9
2014	$	3.0	$	-	$	7.7	$	10.7
2015	$	403.0	$	-	$	7.7	$	410.7
2016	$	3.0	$	1,100.0	$	7.7	$	1,110.7

Additionally, our senior notes due 2028 (6.5 percent) are callable at par at our option from now until maturity.

ONEOK Debt Repayments - In 2011, ONEOK repaid $400 million of maturing senior notes and redeemed $90.5 million of 6.4-percent senior notes with available cash and short-term borrowings.

ONEOK Debt Issuance - In January 2012, we completed an underwritten public offering of $700 million of 4.25-percent senior notes due 2022.  The net proceeds from the offering, after deducting underwriting discounts and offering expenses, of approximately $693.9 million were used to repay amounts outstanding under our $1.2 billion commercial paper program and general corporate purposes, which may include one or more of the following:  the repurchase of our common stock, the purchase of additional common units of ONEOK Partners and the payment of dividends.  We will pay interest on the senior notes due 2022 on February 1 and August 1 of each year, beginning August 1, 2012.

ONEOK Debt Covenants - The indentures governing ONEOK's senior notes due 2028 (6.5 percent and 6.875 percent) include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the senior notes due 2015, 2022 and 2035 include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2015, 2022, 2028 and 2035 to declare those senior notes immediately due and payable in full.

ONEOK may redeem the senior notes due 2015, 2028 (6.875 percent) and 2035, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  ONEOK may redeem the senior notes due 2028 (6.5 percent), in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest.  ONEOK may redeem its 4.25-percent senior notes due 2022 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting three month before the maturity date.  Prior to this date, ONEOK may redeem these senior notes on the same basis as its other senior notes due 2015, 2028 (6.875 percent) and 2035.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK's senior notes due 2015, 2022, 2028 and 2035 are senior unsecured obligations, ranking equally in right of payment with all of ONEOK's existing and future unsecured senior indebtedness.

ONEOK Partners' Debt Issuance and Maturities - In January 2011, ONEOK Partners completed an underwritten public offering of $1.3 billion of senior notes, consisting of $650 million of 3.25-percent senior notes due 2016 and $650 million of 6.125-percent senior notes due 2041.  The net proceeds from the offering of approximately $1.28 billion were used to repay amounts outstanding under ONEOK Partners' commercial paper program, to repay the $225 million of ONEOK Partners' senior notes that matured in March 2011 and for general partnership purposes, including capital expenditures.

ONEOK Partners intends to repay its $350 million 5.9-percent senior notes that mature in April 2012 with a combination of cash on hand and short-term borrowings.

ONEOK Partners' Debt Covenants - The indentures governing ONEOK Partners' senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more.  Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of ONEOK Partners' outstanding senior notes to declare those senior notes immediately due and payable in full.

ONEOK Partners may redeem the senior notes due 2012, 2016 (6.15 percent), 2019, 2036 and 2037, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium.  The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date.  ONEOK Partners may redeem its senior notes due 2016 (3.25 percent) and 2041 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one month and six months, respectively, before their maturity dates.  Prior to these dates, ONEOK Partners may redeem these senior notes on the same terms as its other senior notes.  ONEOK Partners' senior notes are senior unsecured obligations, ranking equally in right of payment with all of ONEOK Partners' existing and future unsecured senior indebtedness, and structurally subordinate to all of the existing and future debt and other liabilities of any nonguarantor subsidiaries.  ONEOK Partners' senior notes are nonrecourse to ONEOK.

ONEOK Partners' Debt Guarantee - ONEOK Partners' senior notes are guaranteed on a senior unsecured basis by the Intermediate Partnership.  The Intermediate Partnership's guarantee is full and unconditional, subject to certain customary automatic release provisions.  The guarantee ranks equally in right of payment to all of the Intermediate Partnership's existing and future unsecured senior indebtedness.  ONEOK Partners has no significant assets or operations other than its investment in the Intermediate Partnership, which is also consolidated.  At December 31, 2011, the Intermediate Partnership held the equity of ONEOK Partners' subsidiaries, as well as a 50-percent interest in Northern Border Pipeline.  ONEOK Partners' long-term debt is nonrecourse to ONEOK.

Guardian Pipeline Senior Notes - These senior notes were issued under a master shelf agreement dated November 8, 2001, with certain financial institutions.  Principal payments are due quarterly through 2022.  Interest rates on the $85.9 million in senior notes outstanding at December 31, 2011, range from 7.61 percent to 8.27 percent, with an average rate of 7.85 percent.  Guardian Pipeline's senior notes contain financial covenants that require the maintenance of a ratio of (i) EBITDAR, as defined in the master shelf agreement to fixed charges (interest expense plus operating lease expense) of not less than 1.5 to 1; and (ii) total indebtedness to EBITDAR of not greater than 4.75 to 1.  Upon any breach of these covenants, all amounts outstanding under the master shelf agreement may become due and payable immediately.  At December 31, 2011, Guardian Pipeline's EBITDAR-to-fixed-charges ratio was 6.5 to 1, the ratio of total indebtedness to EBITDAR was 1.8 to 1, and Guardian Pipeline was in compliance with its financial covenants.

Interest-rate Swaps - See Note D for a discussion of our interest-rate swaps.

Other - We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

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Document And Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Feb. 14, 2012	Jun. 30, 2011
Entity Registrant Name	ONEOK INC /NEW/
Entity Central Index Key	0001039684
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7.3
Entity Common Stock, Shares Outstanding		103,893,790
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011

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EQUITY

12 Months Ended

Dec. 31, 2011

EQUITY [Abstract]

EQUITY

I.           EQUITY

Series A and B Convertible Preferred Stock - There are no shares of Series A or Series B Preferred Stock currently issued or outstanding.

Series C Preferred Stock -Series C Preferred Stock (Series C) is designed to protect our shareholders from coercive or unfair takeover tactics.  If issued, holders of shares of Series C are entitled to receive, in preference to the holders of ONEOK Common Stock, quarterly dividends in an amount per share equal to the greater of $0.50 or, subject to adjustment, 100 times the aggregate per share amount of all cash dividends, and 100 times the aggregate per share amount (payable in kind) of all noncash dividends.  No shares of Series C have been issued.

Common Stock - At December 31, 2011, we had approximately 179.8 million shares of authorized and unreserved common stock available for issuance.

Stock Split - On February 15, 2012, our Board of Directors authorized a two-for-one split of our common stock, subject to shareholder approval of a proposal to increase the number of authorized shares of our common stock to 600 million from 300 million.  The proposal will be voted on at our 2012 annual meeting of shareholders on May 23, 2012.

Dividends - Dividends paid totaled $227.0 million, $193.5 million and $172.8 million for 2011, 2010 and 2009, respectively.  The following table sets forth the quarterly dividends per share declared and paid on our common stock for the periods indicated:

	Years Ended December 31,
	2011		2010		2009
First Quarter	$	0.52	$	0.44	$	0.40
Second Quarter	$	0.52	$	0.44	$	0.40
Third Quarter	$	0.56	$	0.46	$	0.42
Fourth Quarter	$	0.56	$	0.48	$	0.42
Total	$	2.16	$	1.82	$	1.64

Additionally, a quarterly dividend of $0.61 per share was declared in January 2012, payable in the first quarter of 2012.

Stock Repurchase Plan - In 2011, we repurchased approximately 4.3 million shares of our common stock for approximately $300 million pursuant to an accelerated stock repurchase agreement.  The 2011 stock repurchase was part of our three-year stock repurchase program to buy up to $750 million of our common stock that was authorized by our Board of Directors in October 2010.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Unrealized gain (losses) on energy marketing and risk management assets/liabilities, tax	$ (8,670)	$ (43,039)	$ (26,488)
Realized gains in net income, tax	53,714	29,278	48,059
Unrealized holding gains (losses) on available-for-sale securities, tax	242	44	(396)
Change in pension and postretirement benefit plan liability, tax	16,298	7,570	9,186
Other, tax	$ 50	$ (45)	$ (84)

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FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2011

FAIR VALUE MEASUREMENTS [Abstract]

FAIR VALUE MEASUREMENTS

C.           FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for our continuing and discontinued operations for the periods indicated:

	December 31, 2011
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	545,247		$	13,874		$	32,931		$	-		$	592,052
Physical contracts		-			23,879			14,916			-			38,795
Netting		-			-			-			(569,243	)		(569,243	)
Total derivatives		545,247			37,753			47,847			(569,243	)		61,604
Trading securities (b)		5,749			-			-			-			5,749
Available-for-sale investment securities (c)		1,949			-			-			-			1,949
Total assets	$	552,945		$	37,753		$	47,847		$	(569,243	)	$	69,302
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(479,073	)	$	(6,498	)	$	(20,995	)	$	-		$	(506,566	)
Physical contracts		-			(261	)		(1,748	)		-			(2,009	)
Netting		-			-			-			497,608			497,608
Interest-rate contracts		-			(128,666	)		-			-			(128,666	)
Total derivatives		(479,073	)		(135,425	)		(22,743	)		497,608			(139,633	)
Fair value of firm commitments (d)		-			-			(7,283	)		-			(7,283	)
Total liabilities	$	(479,073	)	$	(135,425	)	$	(30,026	)	$	497,608		$	(146,916	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2011, we held $73.3 million of cash collateral and had posted $1.7 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred assets.

	December 31, 2010
	Level 1			Level 2			Level 3			Netting			Total
	(Thousands of dollars)
Assets
Derivatives (a)
Commodity contracts
Financial contracts	$	127,789		$	1,755		$	152,639		$	-		$	282,183
Physical contracts		-			13,185			20,391			-			33,576
Netting		-			-			-			(251,898	)		(251,898	)
Total derivatives		127,789			14,940			173,030			(251,898	)		63,861
Trading securities (b)		7,591			-			-			-			7,591
Available-for-sale investment securities (c)		2,574			-			-			-			2,574
Total assets	$	137,954		$	14,940		$	173,030		$	(251,898	)	$	74,026
Liabilities
Derivatives (a)
Commodity contracts
Financial contracts	$	(64,768	)	$	(3,241	)	$	(119,430	)	$	-		$	(187,439	)
Physical contracts		-			(3,763	)		(4,334	)		-			(8,097	)
Netting		-			-			-			170,515			170,515
Total derivatives		(64,768	)		(7,004	)		(123,764	)		170,515			(25,021	)
Fair value of firm commitments (d)		-			-			(29,536	)		-			(29,536	)
Total liabilities	$	(64,768	)	$	(7,004	)	$	(153,300	)	$	170,515		$	(54,557	)
(a) - Our derivative assets and liabilities are presented in our Consolidated Balance Sheets as energy marketing and risk-management assets and liabilities, other assets and other deferred credits on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2010, we held $82.5 million of cash collateral and had posted $1.1 million of cash collateral with various counterparties.
(b) - Included in our Consolidated Balance Sheets as other current assets.
(c) - Included in our Consolidated Balance Sheets as other assets.
(d) - Included in our Consolidated Balance Sheets as other current liabilities and other deferred credits.

The tables above include balances for ONEOK Energy Marketing Company that have been reflected as a discontinued component in our Consolidated Balance Sheets.  At December 31, 2011, we had $15.0 million in derivative assets and $0.6 million in derivative liabilities related to this discontinued operation.  At December 31, 2010, we had $7.7 million in derivative assets and $1.1 million in derivative liabilities related to this discontinued operation.

Our Level 1 fair value measurements are based on NYMEX-settled prices and actively quoted prices for equity securities.  These balances are comprised predominantly of exchange-traded derivative contracts, including futures and certain options for natural gas and crude oil, which are valued based on unadjusted quoted prices in active markets.  Also included in Level 1 are equity securities.

Our Level 2 fair value inputs are based on NYMEX-settled prices for natural gas and crude oil that are utilized to determine the fair value of certain nonexchange-traded financial instruments, including natural gas and crude oil swaps, as well as physical forwards.  Also, included in Level 2 are interest-rate swaps that are valued using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest swap settlements.

Our Level 3 inputs include internally developed basis curves incorporating observable and unobservable market data, NGL price curves from broker quotes, market volatilities derived from the most recent NYMEX close spot prices and forward LIBOR curves, and adjustments for the credit risk of our counterparties.  We corroborate the data on which our fair value estimates are based using our market knowledge of recent transactions, analysis of historical correlations and validation with independent broker quotes.  The derivatives categorized as Level 3 include natural gas basis swaps, swing swaps, options, other commodity swaps and physical forward contracts.  Also included in Level 3 are the fair values of firm commitments.  We do not believe that our Level 3 fair value estimates have a material impact on our results of operations, as the majority of our derivatives are accounted for as hedges for which ineffectiveness is not material.

The following tables set forth the reconciliation of our Level 3 fair value measurements for the periods indicated:

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2011	$	49,266		$	(29,536	)	$	19,730
Total realized/unrealized gains (losses):
Included in earnings (a)		(28,425	)		22,253			(6,172	)
Included in other comprehensive income (loss)		5,443			-			5,443
Transfers into Level 3		1,428			-			1,428
Transfers out of Level 3		(2,608	)		-			(2,608	)
December 31, 2011	$	25,104		$	(7,283	)	$	17,821
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2011 (a)	$	21,349		$	(6,581	)	$	14,768
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

	Derivative Assets (Liabilities)			Fair Value of Firm Commitments			Total
	(Thousands of dollars)
January 1, 2010	$	136,694		$	(134,620	)	$	2,074
Total realized/unrealized gains (losses):
Included in earnings (a)		(91,662	)		105,084			13,422
Included in other comprehensive income (loss)		11,122			-			11,122
Transfers into Level 3		765			-			765
Transfers out of Level 3		(7,653	)		-			(7,653	)
December 31, 2010	$	49,266		$	(29,536	)	$	19,730
Total gains (losses) for the period included in    earnings attributable to the change in unrealized    gains (losses) relating to assets and liabilities    still held as of December 31, 2010 (a)	$	22,101		$	(4,551	)	$	17,550
(a) - Reported in revenues and cost of sales and fuel in our Consolidated Statements of Income.

Realized/unrealized gains (losses) include the realization of our derivative contracts through maturity and changes in fair value of our hedged firm commitments.

Other Financial Instruments -The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and notes payable is equal to book value, due to the short-term nature of these items.

The estimated fair value of our consolidated long-term debt, including current maturities, was $5.6 billion and $4.7 billion at December 31, 2011 and 2010, respectively.  The book value of long-term debt, including current maturities, was $4.9 billion and $4.3 billion at December 31, 2011 and 2010, respectively.  The estimated fair value of long-term debt has been determined using quoted market prices of ONEOK's and ONEOK Partners' senior notes or similar issues with similar terms and maturities.

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DISCONTINUED OPERATIONS

12 Months Ended

Dec. 31, 2011

DISCONTINUED OPERATIONS (Tables) [Abstract]

DISCONTINUED OPERATIONS

B.           DISCONTINUED OPERATIONS

In December 2011, we entered into a definitive agreement to sell ONEOK Energy Marketing Company to Constellation Energy Group, Inc. for $22.5 million plus working capital.  The transaction closed on February 1, 2012.  The financial information of ONEOK Energy Marketing Company is reflected as discontinued operations in this Annual Report.  All prior periods presented have been recast to reflect the discontinued operations.

The amounts of revenue, costs and income taxes reported in discontinued operations are set forth in the table below for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Operating revenues	$	313,371		$	351,260		$	305,897
Cost of sales and fuel		302,561			340,888			287,902
Net margin		10,810			10,372			17,995
Operating costs		7,147			8,914			6,162
Depreciation, depletion and amortization		128			93			68
Operating income		3,535			1,365			11,765
Other income (expense), net		(50	)		21			95
Income taxes		(1,255	)		(114	)		(4,313	)
Income from discontinued operations, net	$	2,230		$	1,272		$	7,547

The following table discloses the major classes of discontinued assets and liabilities included on our Consolidated Balance Sheets for the periods indicated:

	December 31,
	2011		2010
Assets	(Thousands of dollars)
Cash and cash equivalents	$	8,859	$	693
Accounts receivable, net		47,967		48,834
Gas in storage		2,101		2,020
Energy marketing and risk management assets		15,016		7,703
Property, plant and equipment, net		145		235
Other assets		48		40
Assets of discontinued operations	$	74,136	$	59,525
Liabilities
Accounts payable	$	11,435	$	3,147
Energy marketing and risk management liabilities		629		1,053
Other liabilities		751		8,009
Liabilities of discontinued operations	$	12,815	$	12,209

At December 31, 2011 and 2010, the liabilities of our discontinued operations exclude $45.7 million and $40.2 million, respectively, of intercompany payables due to its parent or other affiliates.

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INCOME TAXES

12 Months Ended

Dec. 31, 2011

INCOME TAXES [Abstract]

INCOME TAXES

N.           INCOME TAXES

The following table sets forth our provisions for income taxes for the periods indicated:

	Years Ended December 31,
	2011				2010		2009
Current income taxes	(Thousands of dollars)
Federal	$	(32,291	)		$	58,844	$	2,664
State		1,707				12,629		1,604
Total current income taxes from continuing operations		(30,584	)	(a)		71,473		4,268
Deferred income taxes
Federal		228,257				124,126		170,100
State		28,375				18,121		28,640
Total deferred income taxes from continuing operations		256,632		(a)		142,247		198,740
Total provision for income taxes from continuing operations		226,048				213,720		203,008
Discontinued operations		1,255				114		4,313
Total provision for income taxes	$	227,303			$	213,834	$	207,321
(a) Includes a $37.7 million reclassification from current income taxes to deferred related to revisions of estimated depreciation in our filed tax returns compared with our 2010 tax provision.

The following table is a reconciliation of our income tax provision from continuing operations for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Income from continuing operations before income taxes	$	983,562		$	753,778		$	686,665
Less: Net income attributable to noncontrolling interest		399,150			206,698			185,753
Income from continuing operations attributable to ONEOK    before income taxes		584,412			547,080			500,912
Federal statutory income tax rate		35	%		35	%		35	%
Provision for federal income taxes		204,543			191,478			175,319
State income taxes, net of federal tax benefit		20,334			19,946			19,625
Other, net		1,171			2,296			8,064
Income tax provision from continuing operations	$	226,048		$	213,720		$	203,008

The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated.

	December 31,		December 31,
	2011		2010
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	136,997	$	89,480
Other comprehensive income		134,037		73,515
Other		31,544		25,694
Total deferred tax assets		302,578		188,689
Deferred tax liabilities
Excess of tax over book depreciation and depletion		664,415		519,627
Investment in partnerships		851,408		729,682
Regulatory assets		200,010		157,756
Total deferred tax liabilities		1,715,833		1,407,065
Net deferred tax liabilities before discontinued operations		1,413,255		1,218,376
Discontinued operations		82		26
Net deferred tax liabilities	$	1,413,337	$	1,218,402

We had income taxes receivable of approximately $10.7 million and $45.7 million at December 31, 2011 and 2010, respectively.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

12 Months Ended

Dec. 31, 2011

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

J.           ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table sets forth the balance in accumulated other comprehensive income (loss) for the periods indicated:

	Unrealized Gains  (Losses) on Energy  Marketing and Risk Management  Assets/Liabilities		Unrealized Holding Gains (Losses) on Investment Securities		Pension and  Postretirement  Benefit Plan  Obligations		Accumulated  Other  Comprehensive  Income (Loss)
		(Thousands of dollars)
January 1, 2010	$	(6,151)	$	1,441	$	(113,903)	$	(118,613)
Other comprehensive income (loss)    attributable to ONEOK		21,882		(70)		(12,001)		9,811
December 31, 2010		15,731		1,371		(125,904)		(108,802)
Other comprehensive income (loss)    attributable to ONEOK		(71,098)		(384)		(25,837)		(97,319)
December 31, 2011	$	(55,367)	$	987	$	(151,741)	$	(206,121)

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GOODWILL AND INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2011

GOODWILL AND INTANGIBLE ASSETS [Abstract]

GOODWILL AND INTANGIBLE ASSETS

F.           GOODWILL AND INTANGIBLE ASSETS

Goodwill - The following table sets forth our goodwill, by segment, at both December 31, 2011 and 2010:

	December 31,		December 31,
	2011		2010
	(Thousands of dollars)
ONEOK Partners	$	433,535	$	433,537
Natural Gas Distribution		157,953		157,953
Energy Services		10,255		10,255
Other		-		1,099
Total goodwill	$	601,743	$	602,844

Intangible Assets - The following table sets forth the gross carrying amount and accumulated amortization of intangible assets for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Gross intangible assets	$	462,214		$	462,214
Accumulated amortization		(49,830	)		(42,164	)
Net intangible assets	$	412,384		$	420,050

At December 31, 2011 and 2010, our ONEOK Partners segment has $256.8 million and $264.5 million, respectively, of intangible assets related primarily to contracts acquired through acquisition, which are being amortized over an aggregate weighted-average period of 40 years.  The remaining intangible asset balance has an indefinite life.  Amortization expense for intangible assets for 2011, 2010 and 2009 was $7.7 million each year, and the aggregate amortization expense for each of the next five years is estimated to be approximately $7.7 million.

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INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current income taxes
Federal	$ (32,291,000)	$ 58,844,000	$ 2,664,000
State	1,707,000	12,629,000	1,604,000
Total current income taxes from continuing operations	(30,584,000)	71,473,000	4,268,000
Deferred income taxes
Federal	228,257,000	124,126,000	170,100,000
State	28,375,000	18,121,000	28,640,000
Total deferred income taxes from continuing operations	256,632,000	142,247,000	198,740,000
Total provision for income taxes from continuing operations	226,048,000	213,720,000	203,008,000
Income taxes	1,255,000	114,000	4,313,000
Total provision for income taxes	227,303,000	213,834,000	207,321,000
Reclassification from current income taxes	37,700,000
Reconciliation for income tax provision [Abstract]
Income from continuing operations before income taxes	983,562,000	753,778,000	686,665,000
Less: Net income attributable to noncontrolling interest	399,150,000	206,698,000	185,753,000
Income from continuing operations attributable to ONEOK before income taxes	584,412,000	547,080,000	500,912,000
Federal statutory income tax rate	35.00%	35.00%	35.00%
Provision for federal income taxes	204,543,000	191,478,000	175,319,000
State income taxes, net of federal tax benefit	20,334,000	19,946,000	19,625,000
Other, net	1,171,000	2,296,000	8,064,000
Income tax provision from continuing operations	226,048,000	213,720,000	203,008,000
Deferred tax assets
Employee benefits and other accrued liabilities	136,997,000	89,480,000
Other comprehensive income	134,037,000	73,515,000
Other	31,544,000	25,694,000
Total deferred tax assets	302,578,000	188,689,000
Deferred tax liabilities
Excess of tax over book depreciation and depletion	664,415,000	519,627,000
Investment in partnerships	851,408,000	729,682,000
Regulatory assets	200,010,000	157,756,000
Total deferred tax liabilities	1,715,833,000	1,407,065,000
Net deferred tax liabilities before discontinued operations	1,413,255,000	1,218,376,000
Discontinued Operations	82,000	26,000
Net deferred tax liabilities	1,413,337,000	1,218,402,000
Income taxes receivable	$ 10,700,000	$ 45,700,000

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

12 Months Ended

Dec. 31, 2011

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES [Abstract]

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

D.           RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Our Energy Services and ONEOK Partners segments are exposed to various risks that we manage by periodically entering into derivative instruments.  These risks include the following:

·   Commodity price risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs and crude oil.  We use commodity derivative instruments such as futures, physical forward contracts, swaps and options to reduce the commodity price risk associated with a portion of the forecasted purchases and sales of commodities and natural gas and natural gas liquids in storage.  Commodity price volatility may have a significant impact on the fair value of our derivative instruments as of a given date;

·   Basis risk - We are exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price differentials between pipeline receipt and delivery locations.  Our firm transportation capacity allows us to purchase natural gas at a pipeline receipt point and sell natural gas at a pipeline delivery point.  As market conditions permit, our Energy Services segment periodically enters into basis swaps between the transportation receipt and delivery points in order to protect the fair value of these location price differentials related to our firm commitments;

·   Currency exchange rate risk - As a result of our Energy Services segment’s activities in Canada, we are exposed to the risk of loss in cash flows and future earnings from adverse changes in currency exchange rates on our commodity purchases and sales, primarily related to our firm transportation and storage contracts that are transacted in a currency other than our functional currency, the United States dollar.  To reduce our exposure to exchange-rate fluctuations, we use physical forward transactions, which result in an actual two-way flow of currency on the settlement date in which we exchange United States dollars for Canadian dollars with another party; and

·   Interest-rate risk - We are also subject to fluctuations in interest rates.  We manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and, at times, interest-rate swaps.

The following derivative instruments are used to manage our exposure to these risks:

·   Futures contracts - Standardized exchange-traded contracts to purchase or sell natural gas and crude oil at a specified price, requiring delivery on or settlement through the sale or purchase of an offsetting contract by a specified future date under the provisions of exchange regulations;

·   Forward contracts - Commitments to purchase or sell natural gas, crude oil or NGLs for physical delivery at some specified time in the future.  We also use currency forward contracts to manage our currency exchange rate risk.  Forward contracts are different from futures in that forwards are customized and nonexchange traded;

·   Swaps - Financial trades involving the exchange of payments based on two different pricing structures for a commodity or other instrument.  In a typical commodity swap, parties exchange payments based on changes in the price of a commodity or a market index, while fixing the price they effectively pay or receive for the physical commodity.  As a result, one party assumes the risks and benefits of movements in market prices, while the other party assumes the risks and benefits of a fixed price for the commodity.  Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts; and

·   Options - Contractual agreements that give the holder the right, but not the obligation, to buy or sell a fixed quantity of a commodity, at a fixed price, within a specified period of time.  Options may either be standardized and exchange traded or customized and nonexchange traded.

Our objectives for entering into such contracts include but are not limited to:

·   reducing the variability of cash flows by locking in the price for all or a portion of anticipated index-based physical purchases and sales, transportation fuel requirements, asset management transactions and customer-related business activities;

·   locking in a price differential to protect the fair value between transportation receipt and delivery points and to protect the fair value of natural gas or NGLs that are purchased in one month and sold in a later month;

·   reducing our exposure to fluctuations in interest and foreign currency exchange rates; and

·   reducing variability in cash flows from changes in interest rates associated with forecasted debt issuances.

Our Energy Services segment also enters into derivative contracts for financial trading purposes primarily to capitalize on opportunities created by market volatility, weather-related events, supply-demand imbalances and market liquidity inefficiencies, which allow us to capture additional margin.  Financial trading activities are executed generally using financially settled derivatives and are normally short term in nature.

With respect to the net open positions that exist within our marketing and financial trading operations, fluctuating commodity prices can impact our financial position and results of operations.  The net open positions are actively managed, and the impact of the changing prices on our financial condition at a point in time is not necessarily indicative of the impact of price movements throughout the year.

Our Natural Gas Distribution segment also uses derivative instruments to hedge the cost of a portion of anticipated natural gas purchases during the winter heating months to protect our customers from upward volatility in the market price of natural gas.  The use of these derivative instruments and the associated recovery of these costs have been approved by the OCC, KCC and regulatory authorities in certain of our Texas jurisdictions.

At December 31, 2011, ONEOK and ONEOK Partners had forward-starting interest-rate swaps with notional amounts of $500 million and $750 million, respectively, that have been designated as cash flow hedges of the variability of interest payments on a portion of forecasted debt issuances that may result from changes in the benchmark interest rate before the debt is issued.  In January 2012, ONEOK entered into an additional interest-rate swap that was designated as a cash flow hedge with a notional amount of $200 million.  Upon issuance in January 2012 of our $700 million of 4.25-percent senior notes due 2022, ONEOK settled its swaps and realized a loss of $44.1 million that will be amortized to interest expense over the term of the debt.  At December 30, 2010, ONEOK and ONEOK Partners did not have any interest-rate swap agreements.

Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments for our continuing and discontinued operations for the periods indicated:

	December 31, 2011						December 31, 2010
	Fair Values of Derivatives (a)						Fair Values of Derivatives (a)
	Assets			(Liabilities)			Assets			(Liabilities)
	(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts
Financial contracts	$	184,184	(b)	$	(73,346	)	$	136,040	(c)	$	(23,843	)
Physical contracts		62			(344	)		-			(883	)
Interest-rate contracts		-			(128,666	)		-			-
Total derivatives designated as hedging instruments		184,246			(202,356	)		136,040			(24,726	)
Derivatives not designated as hedging instruments
Commodity contracts
Nontrading instruments
Financial contracts		295,948			(323,170	)		125,503			(144,940	)
Physical contracts		38,733			(1,665	)		33,576			(7,214	)
Trading instruments
Financial contracts		111,920			(110,050	)		20,640			(18,656	)
Total derivatives not designated as hedging instruments		446,601			(434,885	)		179,719			(170,810	)
Total derivatives	$	630,847		$	(637,241	)	$	315,759		$	(195,536	)
(a) - Included on a net basis in energy marketing and risk-management assets and liabilities on our Consolidated Balance Sheets.
(b) - Includes $88.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.
(c) - Includes $44.9 million of derivative assets associated with cash flow hedges of inventory that were adjusted to reflect the lower of cost or market value. The deferred gains associated with these assets have been reclassified from accumulated other comprehensive loss.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for our continuing and discontinued operations for the periods indicated:

					December 31, 2011		December 31, 2010
				Contract Type	Purchased/ Payor	Sold/ Receiver	Purchased/ Payor	Sold/ Receiver
Derivatives designated as hedging instruments:
	Cash flow hedges
		Fixed price
			- Natural gas (Bcf)	Exchange futures	21.2	(23.4)	0.4	(7.6)
				Swaps	19.5	(111.9)	3.0	(69.9)
			- Crude oil and NGLs (MMBbl)	Swaps	-	(2.9)	-	(1.5)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	3.2	(82.8)	2.8	(64.9)
		Interest-rate contracts (Millions of dollars)		Forward-starting swaps	$1,250.0	-	-	-
	Fair value hedges
		Basis
			- Natural gas (Bcf)	Forwards and swaps	76.5	(77.0)	141.1	(141.1)
Derivatives not designated as hedging instruments:
		Fixed price
			- Natural gas (Bcf)	Exchange futures	76.9	(59.6)	34.6	(20.6)
				Forwards and swaps	235.8	(253.4)	73.6	(100.3)
				Options	33.6	(14.3)	81.0	(74.3)
			- Crude and NGLs (MMBbl)	Forwards and swaps	-	-	0.6	(0.6)
		Basis
			- Natural gas (Bcf)	Forwards and swaps	216.9	(219.3)	411.5	(419.7)
		Index
			- Natural gas (Bcf)	Forwards and swaps	29.3	(22.1)	33.6	(6.1)

These notional amounts are used to summarize the volume of financial instruments; however, they do not reflect the extent to which the positions offset one another and consequently do not reflect our actual exposure to market or credit risk.

Cash Flow Hedges -Our Energy Services and ONEOK Partners segments use derivative instruments to hedge the cash flows associated with anticipated purchases and sales of natural gas, NGLs and condensate and cost of fuel used in the transportation of natural gas.  Accumulated other comprehensive income (loss) at December 31, 2011, includes net losses of approximately $1.8 million, net of tax, related to these hedges that will be recognized within the next 24 months as the forecasted transactions affect earnings.  If prices remain at current levels, we will recognize $12.8 million in net losses over the next 12 months, and we will recognize net gains of $11.0 million thereafter.  The amounts deferred in accumulated comprehensive income (loss) attributable to our interest-rate swaps will be amortized to interest expense over the life of long-term, fixed-rate debt upon issuance of the debt.

In 2011 and 2010, cost of sales and fuel in our Consolidated Statements of Income includes $91.1 million and $58.7 million in each period, respectively, reflecting an adjustment to natural gas inventory at the lower of cost or market value.  In each period, we reclassified $91.1 million and $58.7 million, respectively, of deferred gains, before income taxes, on associated cash flow hedges from accumulated other comprehensive income (loss) into earnings.

The following table sets forth the effect of cash flow hedges recognized in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
Derivatives in Cash Flow Hedging Relationships	2011			2010		2009
	(Thousands of dollars)
Commodity contracts	$	117,508		$	128,662	$	49,344
Interest rate contracts		(128,666	)		-		1,599
Total gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	$	(11,158	)	$	128,662	$	50,943

The following tables set forth the effect of cash flow hedges on our Consolidated Statements of Income for the periods indicated:

	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income  (Loss) into Net Income (Effective Portion)
Derivatives in Cash Flow			Years Ended December 31,
Hedging Relationships			2011			2010		2009
			(Thousands of dollars)
Commodity contracts	Revenues	$	48,601		$	68,209	$	188,144
Commodity contracts	Cost of sales and fuel		89,618			9,158		(36,776	)
Interest rate contracts	Interest expense		(480	)		28		1,240
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)		$	137,739		$	77,395	$	152,608

Ineffectiveness related to our cash flow hedges was not material for the years ended December 31, 2011, 2010 and 2009.  In the event that it becomes probable that a forecasted transaction will not occur, we will discontinue cash flow hedge treatment, which will affect earnings.  For the years ended December 31, 2011, 2010 and 2009, there were no gains or losses due to the discontinuance of cash flow hedge treatment as a result of the underlying transactions being no longer probable.

Other Derivative Instruments - The following table sets forth the effect of our derivative instruments that are not part of a hedging relationship on our Consolidated Statements of Income for our continuing and discontinued operations for the periods indicated:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss)		Years Ended December 31,
			2011		2010		2009
			(Thousands of dollars)
Commodity contracts - trading	Revenues	$	1,796	$	5,710	$	3,210
Commodity contracts - non-trading (a)	Cost of sales and fuel		16,178		5,371		10,085
Foreign exchange contracts	Revenues		-		18		886
Total gain recognized in income on derivatives		$	17,974	$	11,099	$	14,181
(a) - Amounts are presented net of deferred losses associated with derivatives entered into by our Natural Gas Distribution segment.

Our Natural Gas Distribution segment held natural gas call options with premiums totaling $10.0 million and $16.7 million at December 31, 2011 and 2010, respectively.  The premiums are recorded in other current assets as these contracts are included in, and recoverable through, the monthly purchased-gas cost mechanism.  We recorded losses associated with the decline in the value and expiration of option contracts totaling approximately $14.5 million, $25.5 million and $22.6 million for the years ended December 31, 2011, 2010 and 2009, respectively, which were deferred as part of our unrecovered purchased-gas costs.

Fair Value Hedges - In prior years, we terminated various interest-rate swap agreements that had been designated as fair value hedges.  The net savings from the termination of these swaps is being recognized in interest expense over the terms of the debt instruments originally hedged.  Interest expense savings from the amortization of terminated swaps for 2011, 2010 and 2009, were $4.3 million, $10.2 million and $10.3 million, respectively.

Our Energy Services segment uses basis swaps to hedge the fair value of price location differentials related to certain firm transportation commitments.  Cost of sales and fuel in our Consolidated Statements of Income includes gains of $14.6 million, $2.4 million and $253.2 million for 2011, 2010 and 2009, respectively, related to the change in fair value of derivatives designated as fair value hedges.  Revenues include losses of $13.8 million, $2.7 million and $250.5 million for 2011, 2010 and 2009, respectively, to recognize the change in fair value of the related hedged firm commitments.  Ineffectiveness included in cost of sales and fuel related to these hedges was immaterial for the years ended December 31, 2011, 2010 and 2009.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee.  We maintain credit policies with regard to our counterparties that we believe minimize overall credit risk.  These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty.  We have counterparties whose credit is not rated, and for those customers we use internally developed credit ratings.

Some of our derivative instruments contain provisions that require us to maintain an investment-grade credit rating from S&P and/or Moody’s.  If our credit ratings on senior unsecured long-term debt were to decline below investment grade, we would be in violation of these provisions, and the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions.  The aggregate fair value of all financial derivative instruments with contingent features related to credit risk that were in a net liability position as of December 31, 2011, was $5.9 million.  If the contingent features underlying these agreements were triggered on December 31, 2011, we would have been required to post an additional $5.9 million of collateral to our counterparties.

The counterparties to our derivative contracts consist primarily of major energy companies, LDCs, electric utilities, financial institutions and commercial and industrial end-users.  This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions.  Based on our policies, exposures, credit and other reserves, we do not anticipate a material adverse effect on our financial position or results of operations as a result of counterparty nonperformance.

The following tables set forth the net credit exposure from our derivative assets for the period indicated:

	December 31, 2011
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	22,335	$	-	$	564	$	22,899
Oil and gas		9,986		5		80		10,071
Industrial		7		-		14,955		14,962
Financial		13,566		-		-		13,566
Other		100		6		-		106
Total	$	45,994	$	11	$	15,599	$	61,604

	December 31, 2010
	Investment		Non-investment		Not
	Grade		Grade		Rated		Total
Counterparty sector	(Thousands of dollars)
Gas and electric utilities	$	33,847	$	1,240	$	678	$	35,765
Oil and gas		8,995		35		2,091		11,121
Industrial		18		-		7,682		7,700
Financial		9,254		-		-		9,254
Other		-		-		21		21
Total	$	52,114	$	1,275	$	10,472	$	63,861

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PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2011

PROPERTY, PLANT AND EQUIPMENT [Abstract]

PROPERTY, PLANT AND EQUIPMENT

E.           PROPERTY, PLANT AND EQUIPMENT

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful	December 31,			December 31,
	Lives (Years)	2011			2010
		(Thousands of dollars)
Non-Regulated
Gathering pipelines and related equipment	5 to 46	$	1,350,227		$	1,144,753
Processing and fractionation and related equipment	5 to 42		1,294,586			993,100
Storage and related equipment	5 to 54		299,610			263,125
Transmission pipelines and related equipment	15 to 54		182,863			198,373
General plant and other	2 to 42		288,445			297,407
Construction work in process	-		725,944			228,862
Regulated
Natural gas distribution pipelines and related equipment	15 to 80		3,309,876			3,160,197
Storage and related equipment	5 to 54		136,971			133,314
Natural gas transmission pipelines and related equipment	5 to 77		1,771,752			1,717,276
Natural gas liquids transmission pipelines and related equipment	5 to 80		1,436,500			1,351,245
General plant and other	2 to 85		291,642			261,783
Construction work in process	-		89,518			104,386
Property, plant and equipment			11,177,934			9,853,821
Accumulated depreciation and amortization - non-regulated			(811,644	)		(707,535	)
Accumulated depreciation and amortization - regulated			(1,921,957	)		(1,833,338	)
Net property, plant and equipment		$	8,444,333		$	7,312,948

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
Regulated Property	2011	2010	2009
ONEOK Partners	1.9% - 2.2%	1.9% - 2.2%	1.8% - 2.2%
Natural Gas Distribution	2.0% - 2.9%	2.1% - 2.8%	2.6% - 2.7%

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CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE

12 Months Ended

Dec. 31, 2011

CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE [Abstract]

CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE

G.           CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE

ONEOK 2011 Credit Agreement -In April 2011, ONEOK entered into the five-year, $1.2 billion ONEOK 2011 Credit Agreement, which replaced the $1.2 billion ONEOK Credit Agreement that was scheduled to expire in July 2011.  The ONEOK 2011 Credit Agreement, which is scheduled to expire in April 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining ONEOK's stand-alone debt-to-capital ratio of no more than 67.5 percent at the end of any calendar quarter, limitations on the ratio of indebtedness secured by liens and indebtedness of subsidiaries to consolidated net tangible assets, a requirement that ONEOK maintains the power to control the management and policies of ONEOK Partners, and a limit on new investments in master limited partnerships.

The ONEOK 2011 Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, investments, fundamental changes in the nature of ONEOK's businesses, transactions with affiliates, the use of proceeds and a covenant that limits ONEOK's ability to restrict its subsidiaries' ability to pay dividends.  Under the terms of the ONEOK 2011 Credit Agreement, ONEOK may request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The debt covenant calculations in the ONEOK 2011 Credit Agreement exclude the debt of ONEOK Partners.  Upon breach of certain covenants by ONEOK, amounts outstanding under the ONEOK 2011 Credit Agreement may become due and payable immediately.  At December 31, 2011, ONEOK's stand-alone debt-to-capital ratio, as defined by the ONEOK 2011 Credit Agreement, was 44.4 percent, and ONEOK was in compliance with all covenants under the ONEOK 2011 Credit Agreement.  At December 31, 2011, ONEOK had $842.0 million of commercial paper outstanding and $2.0 million in letters of credit issued, leaving approximately $356.0 million of credit available under the ONEOK 2011 Credit Agreement.

The ONEOK 2011 Credit Agreement is available to repay our commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK 2011 Credit Agreement.  The ONEOK 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating.  Borrowings, if any, will accrue at LIBOR plus 150 basis points, and the annual facility fee is 25 basis points based on our current credit rating.

The weighted-average interest rate on ONEOK's short-term debt outstanding was 0.50 percent and 0.38 percent at December 31, 2011 and 2010, respectively.

ONEOK Partners 2011 Credit Agreement - In August 2011, ONEOK Partners entered into the five-year, $1.2 billion ONEOK Partners 2011 Credit Agreement, which replaced the $1.0 billion ONEOK Partners Credit Agreement that was due to expire in March 2012.  The ONEOK Partners 2011 Credit Agreement, which is scheduled to expire in August 2016, contains certain financial, operational and legal covenants.  Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in the ONEOK Partners 2011 Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1.  If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will increase to 5.5 to 1 for the three calendar quarters following the acquisitions.  Upon breach of certain covenants by ONEOK Partners in the ONEOK Partners 2011 Credit Agreement, amounts outstanding under the ONEOK Partners 2011 Credit Agreement, if any, may become due and payable immediately.

The ONEOK Partners 2011 Credit Agreement includes a $100-million sublimit for the issuance of standby letters of credit and also features an option to request an increase in the size of the facility to an aggregate of $1.7 billion from $1.2 billion by either commitments from new lenders or increased commitments from existing lenders.

The ONEOK Partners 2011 Credit Agreement is available to repay ONEOK Partners' commercial paper notes, if necessary.  Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONEOK Partners 2011 Credit Agreement.  The ONEOK Partners 2011 Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in ONEOK Partners' credit rating.  Borrowings, if any, will accrue at LIBOR plus 130 basis points, and the annual facility fee is 20 basis points based on ONEOK Partners' current credit rating.  The ONEOK Partners 2011 Credit Agreement is guaranteed fully and unconditionally by ONEOK Partners' wholly owned subsidiary, ONEOK Partners Intermediate Limited Partnership.  Borrowings under the ONEOK Partners 2011 Credit Agreement are nonrecourse to ONEOK.

At December 31, 2011, ONEOK Partners' ratio of indebtedness to adjusted EBITDA was 2.9 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners 2011 Credit Agreement.  At December 31, 2011, ONEOK Partners had no commercial paper outstanding, no letters of credit issued and no borrowings under the ONEOK Partners 2011 Credit Agreement.  The weighted-average interest rate on ONEOK Partners' short-term debt outstanding was 0.38 percent at December 31, 2010.

Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments to unaffiliated parties, and ONEOK does not guarantee the debt or other similar commitments of ONEOK Partners.

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SEGMENTS (Details) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

12 Months Ended

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2010

Sep. 30, 2010

Jun. 30, 2010

Mar. 31, 2010

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Segment Reporting Information [Line Items]

Ownership interest (in hundredths)

42.80%

Sales to unaffiliated customers

$ 14,805,794

$ 12,678,791

$ 10,805,753

Intersegment revenues

0

0

0

Total revenues

4,071,037

3,529,359

3,444,798

3,760,600

3,280,050

2,877,849

2,740,689

3,780,203

14,805,794

12,678,791

10,805,753

Net margin

699,025

532,624

518,833

629,877

542,009

449,504

455,558

615,099

2,380,359

2,062,170

1,997,951

Operating costs

908,323

830,913

830,960

Depreciation and amortization

312,160

307,224

288,923

Gain (loss) on sale of assets

(963)

18,619

4,806

Operating income

1,158,913

942,652

882,874

Equity earnings from investments

127,246

101,880

72,722

Investments in unconsolidated affiliates

1,223,398

1,188,124

1,223,398

1,188,124

765,163

Total assets

13,696,635

12,499,175

13,696,635

12,499,175

12,827,683

Noncontrolling interests in consolidated subsidiaries

1,561,159

1,472,218

1,561,159

1,472,218

1,238,268

Capital expenditures

1,336,067

582,748

791,245

Description of benchmark criteria

10 percent or more of our consolidated gross revenues

10 percent or more of our consolidated gross revenues

10 percent or more of our consolidated gross revenues

ONEOK Partners Regulated Segment [Member]

Segment Reporting Information [Line Items]

Sales to unaffiliated customers

10,919,004

8,218,160

5,998,726

Intersegment revenues

403,603

457,740

475,765

Total revenues

11,322,607

8,675,900

6,474,491

Net margin

1,577,380

1,144,853

1,119,297

Operating costs

459,364

403,476

411,227

Depreciation and amortization

177,549

173,708

164,136

Gain (loss) on sale of assets

(963)

18,632

2,668

Operating income

939,504

586,301

546,602

Equity earnings from investments

127,246

101,880

72,722

Investments in unconsolidated affiliates

1,223,398

1,188,124

1,223,398

1,188,124

765,163

Total assets

8,946,676

7,920,100

8,946,676

7,920,100

7,953,259

Noncontrolling interests in consolidated subsidiaries

5,112

5,176

5,112

5,176

5,603

Capital expenditures

1,063,383

352,714

615,691

ONEOK Partners Regulated Segment [Member] | Regulated Segment [Member]

Segment Reporting Information [Line Items]

Total revenues

658,500

612,200

555,900

Net margin

469,000

479,100

451,000

Operating income

232,800

250,900

200,300

Natural Gas Distribution Regulated Segment [Member]

Segment Reporting Information [Line Items]

Sales to unaffiliated customers

1,609,628

1,810,502

1,832,146

Intersegment revenues

11,706

6,900

6,745

Total revenues

1,621,334

1,817,402

1,838,891

Net margin

751,835

754,917

716,028

Operating costs

422,073

398,861

384,126

Depreciation and amortization

132,212

130,968

122,594

Gain (loss) on sale of assets

0

(13)

486

Operating income

197,550

225,075

209,794

Equity earnings from investments

0

0

0

Investments in unconsolidated affiliates

0

0

0

0

0

Total assets

3,392,475

3,237,890

3,392,475

3,237,890

3,120,704

Noncontrolling interests in consolidated subsidiaries

0

0

0

0

0

Capital expenditures

242,590

215,608

157,508

Energy Services [Member]

Segment Reporting Information [Line Items]

Sales to unaffiliated customers

2,274,799

2,647,460

2,971,902

Intersegment revenues

502,418

653,717

581,740

Total revenues

2,777,217

3,301,177

3,553,642

Net margin

48,740

159,739

159,647

Operating costs

24,527

28,384

35,542

Depreciation and amortization

445

694

540

Gain (loss) on sale of assets

0

0

0

Operating income

23,768

130,661

123,565

Equity earnings from investments

0

0

0

Investments in unconsolidated affiliates

0

0

0

0

0

Total assets

562,728

651,960

562,728

651,960

930,086

Noncontrolling interests in consolidated subsidiaries

0

0

0

0

0

Capital expenditures

41

488

105

Corporate Elimination [Member]

Segment Reporting Information [Line Items]

Sales to unaffiliated customers

2,363

2,669

2,979

Intersegment revenues

(917,727)

(1,118,357)

(1,064,250)

Total revenues

(915,364)

(1,115,688)

(1,061,271)

Net margin

2,404

2,661

2,979

Operating costs

2,359

192

65

Depreciation and amortization

1,954

1,854

1,653

Gain (loss) on sale of assets

0

0

1,652

Operating income

(1,909)

615

2,913

Equity earnings from investments

0

0

0

Investments in unconsolidated affiliates

0

0

0

0

0

Total assets

794,756

689,225

794,756

689,225

823,634

Noncontrolling interests in consolidated subsidiaries

1,556,047

1,467,042

1,556,047

1,467,042

1,232,665

Capital expenditures

$ 30,053

$ 13,938

$ 17,941

XML

COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
COMMITMENTS AND CONTINGENCIES [Abstract]
Number of former manufactured gas sites in Kansas where we own or retain legal responsibility for environmental conditions	12
Number of sites where soil remediation has begun	11
Number of sites where regulatory closure has been achieved	3
Number of sites soil remediation is completed or near completion	8
Number of years of consideration for EPA lowering threshold levels for greenhouse gas emissions	5
Number of years over which capital expenditures are expected to be required to meet administrative standards	2
Minimum percentage yield of high consequence pipeline areas	30.00%
ONEOK [Member]
Total Commitments and Contingencies [Abstract]
2012	123.6
2013	88.4
2014	68.8
2015	43.2
2016	26.4
Thereafter	23.2
Total Commitments and Contingencies	373.6
ONEOK [Member] | Equipment [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
2012	1.2
2013	0.9
2014	0.6
2015	0.3
2016	0
Thereafter	0
Total	3.0
ONEOK [Member] | Firm Transportaion and Storage Contracts [Member]
Firm Transportation and Storage Contracts, Future Minimum Payments Due [Abstract]
2012	122.4
2013	87.5
2014	68.2
2015	42.9
2016	26.4
Thereafter	23.2
Total	370.6
ONEOK Partners LP [Member]
Total Commitments and Contingencies [Abstract]
2012	12.4
2013	9.3
2014	9.0
2015	7.4
2016	5.7
Thereafter	12.1
Total Commitments and Contingencies	55.9
ONEOK Partners LP [Member] | Equipment [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
2012	3.4
2013	2.8
2014	2.8
2015	1.3
2016	1.0
Thereafter	6.4
Total	17.7
ONEOK Partners LP [Member] | Firm Transportaion and Storage Contracts [Member]
Firm Transportation and Storage Contracts, Future Minimum Payments Due [Abstract]
2012	9.0
2013	6.5
2014	6.2
2015	6.1
2016	4.7
Thereafter	5.7
Total	38.2

XML

GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2011

GOODWILL AND INTANGIBLE ASSETS [Abstract]

Goodwill by Segment

Goodwill - The following table sets forth our goodwill, by segment, at both December 31, 2011 and 2010:

	December 31,		December 31,
	2011		2010
	(Thousands of dollars)
ONEOK Partners	$	433,535	$	433,537
Natural Gas Distribution		157,953		157,953
Energy Services		10,255		10,255
Other		-		1,099
Total goodwill	$	601,743	$	602,844

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

Intangible Assets - The following table sets forth the gross carrying amount and accumulated amortization of intangible assets for the periods indicated:

	December 31,			December 31,
	2011			2010
	(Thousands of dollars)
Gross intangible assets	$	462,214		$	462,214
Accumulated amortization		(49,830	)		(42,164	)
Net intangible assets	$	412,384		$	420,050

XML

PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, plant and equipment by type [Abstract]
Property, plant and equipment	11,177,934	9,853,821
Accumulated Depreciation	2,733,601	2,540,873
Net property, plant and equipment	8,444,333	7,312,948
Regulated Segment [Member] | ONEOK Partners [Member]
Average depreciation rate for regulated property [Abstract]
Average depreciation rates, minimum	1.90%	1.90%	1.80%
Average depreciation rates, maximum	2.20%	2.20%	2.20%
Regulated Segment [Member] | Natural Gas Distribution [Member]
Average depreciation rate for regulated property [Abstract]
Average depreciation rates, minimum	2.00%	2.10%	2.60%
Average depreciation rates, maximum	2.90%	2.80%	2.70%
Non-Regulated [Member]
Property, plant and equipment by type [Abstract]
Accumulated Depreciation	(811,644)	(707,535)
Non-Regulated [Member] | Gathering Pipelines and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	46
Property, plant and equipment	1,350,227	1,144,753
Non-Regulated [Member] | Processing and Fractionation and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	42
Property, plant and equipment	1,294,586	993,100
Non-Regulated [Member] | Storage and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	54
Property, plant and equipment	299,610	263,125
Non-Regulated [Member] | Transmission Pipelines and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	15
Estimated Useful Lives, Maximum	54
Property, plant and equipment	182,863	198,373
Non-Regulated [Member] | General Plant and Other [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	2
Estimated Useful Lives, Maximum	42
Property, plant and equipment	288,445	297,407
Non-Regulated [Member] | Construction Work in Process [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	0
Estimated Useful Lives, Maximum	0
Property, plant and equipment	725,944	228,862
Regulated [Member]
Property, plant and equipment by type [Abstract]
Accumulated Depreciation	(1,921,957)	(1,833,338)
Regulated [Member] | Storage and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	54
Property, plant and equipment	136,971	133,314
Regulated [Member] | General Plant and Other [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	2
Estimated Useful Lives, Maximum	85
Property, plant and equipment	291,642	261,783
Regulated [Member] | Construction Work in Process [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	0
Estimated Useful Lives, Maximum	0
Property, plant and equipment	89,518	104,386
Regulated [Member] | Natural Gas Distribution Pipelines and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	15
Estimated Useful Lives, Maximum	80
Property, plant and equipment	3,309,876	3,160,197
Regulated [Member] | Natural Gas Transmission Pipelines and Regulated Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	77
Property, plant and equipment	1,771,752	1,717,276
Regulated [Member] | Natural Gas Liquids Transmission Pipelines and Related Equipment [Member]
Property, plant and equipment by type [Abstract]
Estimated Useful Lives, Minimum	5
Estimated Useful Lives, Maximum	80
Property, plant and equipment	1,436,500	1,351,245

XML

SHARE-BASED PAYMENTS

12 Months Ended

Dec. 31, 2011

SHARE-BASED PAYMENTS [Abstract]

SHARE-BASED PAYMENTS

L.           SHARE-BASED PAYMENTS

Equity Compensation Plan

The ONEOK, Inc. Equity Compensation Plan provides for the granting of stock-based compensation, including incentive stock options, nonstatutory stock options, stock bonus awards, restricted stock awards, restricted stock unit awards, performance stock awards and performance unit awards to eligible employees and the granting of stock awards to nonemployee directors.  We have reserved a total of 5.0 million shares of common stock for issuance under the plan, and at December 31, 2011, we had 2.2 million shares available for issuance under the plan.  The Equity Compensation Plan allows for the deferral of awards granted in stock or cash, in accordance with Internal Revenue Code section 409A requirements.

Restricted Stock Units - Restricted stock units may be granted to key employees with ownership of the common stock underlying the unit vesting over a period determined by the Executive Compensation Committee of our Board of Directors (the Executive Compensation Committee).  Awards outstanding vest over a three-year period and entitle the grantee to receive shares of our common stock.  Restricted stock unit awards are measured at fair value as if they were vested and issued on the grant date, reduced by expected dividend payments and adjusted for estimated forfeitures.No dividends are paid on the restricted stock units.  Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Performance Unit Awards -Performance unit awards may be granted to key employees.  The shares of our common stock underlying the performance units vest at the expiration of a period determined by the Executive Compensation Committee if certain performance criteria are met by us.  Outstanding performance units vest at the expiration of a three-year period.  Upon vesting, a holder of performance units is entitled to receive a number of shares of our common stock equal to a percentage (0 percent to 200 percent) of the performance units granted based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other energy companies over the same period.  Compensation expense is recognized on a straight-line basis over the period of the award.

If paid, the outstanding performance unit awards entitle the grantee to receive the grant in shares of our common stock.  Our outstanding performance unit awards are equity awards with a market-based condition, which results in the compensation cost for these awards being recognized over the requisite service period, provided that the requisite service period is fulfilled, regardless of when, if ever, the market condition is satisfied.  The fair value of these performance units was estimated on the grant date based on a Monte Carlo model.The compensation expense on these awards will only be adjusted for changes in forfeitures.

Long-Term Incentive Plan

The ONEOK, Inc. Long-Term Incentive Plan (the LTIP) provides for the granting of stock awards similar to those described above with respect to the Equity Compensation Plan.  We have reserved a total of approximately 7.8 million shares of common stock for issuance under the plan.  The maximum number of shares for which options or other awards may be granted to any employee during any year is 300,000.

Options - Stock options may be granted that are not exercisable until a fixed future date or in installments.  All outstanding options issued to date have vested and must be exercised no later than 10 years after grant date.  Options issued to date become void upon involuntary termination of employment for just cause or voluntary termination of employment other than retirement.  In the event of retirement or involuntary termination other than for just cause, the optionee may exercise the option within a period determined by the Executive Compensation Committee and stated in the option.  In the event of death, the option may be exercised by the personal representative of the optionee within a period to be determined by the Committee and stated in the option.  No stock options have been granted since 2003.

Stock Compensation Plan for Non-Employee Directors

The ONEOK, Inc. Stock Compensation Plan for Non-Employee Directors (the DSCP) provides for the granting of stock options, stock bonus awards, including performance unit awards, restricted stock awards and restricted stock unit awards.  Under the DSCP, these awards may be granted by the Executive Compensation Committee at any time, until grants have been made for all shares authorized under the DSCP.  We have reserved a total of 700,000 shares of common stock for issuance under the DSCP.  The maximum number of shares of common stock which can be issued to a participant under the DSCP during any year is 20,000.  No performance unit awards or restricted stock awards have been made to nonemployee directors under the DSCP.

General

For all awards outstanding, we used a forfeiture rate ranging from zero percent to 12 percent based on historical forfeitures under our share-based payment plans.  We primarily use issuances from treasury stock to satisfy our share-based payment obligations.

Compensation cost expensed for our share-based payment plans described below was $40.7 million, $15.9 million and $15.1 million during 2011, 2010 and 2009, respectively, which is net of $25.7 million, $10.0 million and $9.5 million of tax benefits, respectively.  Share-based compensation cost capitalized was not material for 2011 and we had no share-based compensation cost capitalized for 2010 and 2009.

Cash received from the exercise of awards under all share-based payment arrangements was $0.9 million, $6.0 million and $3.3 million for 2011, 2010 and 2009, respectively.  The tax benefit realized for the anticipated tax deductions of the exercise of share-based payment arrangements totaled $1.8 million, $3.4 million and $0.9 million for 2011, 2010 and 2009, respectively.

Stock Option Activity

The following table sets forth the stock option activity for employees and nonemployee directors for the periods indicated:

	Number of			Weighted
	Shares			Average Price
Outstanding December 31, 2010		135,190		$	21.52
Exercised		(105,540	)	$	22.78
Outstanding December 31, 2011		29,650		$	17.03
Exercisable December 31, 2011		29,650		$	17.03

The aggregate intrinsic value in the table below represents the total pre-tax intrinsic value, based on our year-end closing stock price of $86.69, that would have been received by the option holders had all option holders exercised their options as of December 31, 2011:

	Stock Options Outstanding and Exercisable
		Weighted				Aggregate
		Average		Weighted		Intrinsic
Range of	Number	Remaining		Average		Value
Exercise Prices	of Awards	Life (yrs)		Exercise Price		(in 000's)
$16.88 to $25.32	29,650	1.02	$	17.03	$	2,065

As of December 31, 2011, all stock options were fully vested and expensed.  The following table sets forth statistics relating to our stock option activity:

	December 31, 2011		December 31, 2010		December 31, 2009
	(Thousands of dollars)
Intrinsic value of options exercised	$	4,756	$	8,953	$	2,453

Restricted Stock Unit Activity

As of December 31, 2011, there was $10.5 million of total unrecognized compensation cost related to our nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.13 years.  The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of			Weighted
	Shares			Average Price
Nonvested December 31, 2010		488,786		$	35.07
Granted		205,750		$	57.00
Released to participants		(1,271	)	$	29.26
Forfeited		(8,928	)	$	42.96
Nonvested December 31, 2011		684,337		$	41.57

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	57.00	$	37.33	$	23.47
Fair value of shares granted (thousands of dollars)	$	11,728	$	8,206	$	2,251

Performance Unit Activity

As of December 31, 2011, there was $7.4 million of total unrecognized compensation cost related to the nonvested performance unit awards, which is expected to be recognized over a weighted-average period of 1.09 years.  The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations of the 2011, 2010 and 2009 grants at the grant date:

	Number of			Weighted
	Units			Average Price
Nonvested December 31, 2010		1,314,587		$	40.30
Granted		420,850		$	69.35
Forfeited		(19,276	)	$	46.12
Nonvested December 31,  2011		1,716,161		$	47.36

	2011		2010		2009
Volatility (a)		39.91%		40.60%		43.58%
Dividend Yield		3.30%		4.12%		5.70%
Risk-free Interest Rate		1.33%		1.47%		1.01%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2011		2010		2009
Weighted-average grant date fair value (per share)	$	69.35	$	48.09	$	29.34
Fair value of shares granted (thousands of dollars)	$	29,186	$	20,738	$	17,232

Employee Stock Purchase Plan

We have reserved a total of 4.8 million shares of common stock for issuance under our ONEOK, Inc. Employee Stock Purchase Plan (the ESPP).  Subject to certain exclusions, all full-time employees are eligible to participate in the ESPP.  Employees can choose to have up to 10 percent of their annual base pay withheld to purchase our common stock, subject to terms and limitations of the plan.  The Executive Compensation Committee may allow contributions to be made by other means, provided that in no event will contributions from all means exceed 10 percent of the employee's annual base pay.  The purchase price of the stock is 85 percent of the lower of its grant date or exercise date market price.  Approximately 56 percent, 53 percent and 53 percent of employees participated in the plan in 2011, 2010 and 2009, respectively.  Compensation expense for the ESPP was $7.2 million, $3.9 million and $6.5 million in 2011, 2010 and 2009, respectively.  Under the plan, we sold 182,558 shares at $47.39 in 2011, 216,897 shares at $37.95 per share in 2010 and 321,888 shares at $24.41 per share in 2009.

Employee Stock Award Program

Under our Employee Stock Award Program, we issued, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE was for the first time at or above $26 per share.  Shares issued to employees under this program during 2011 totaled 147,847, and compensation expense related to the Employee Stock Award Plan was $16.0 million.  For 2010, the number of shares issued under this program was immaterial, and there were no shares issued in 2009.

The total number of shares of our common stock available for issuance under this program was 300,000.  During 2011, the number of shares of our common stock available for distribution for issuance under this program was met.  Shareholder approval is required for further stock awards to be issued under the program.

Deferred Compensation Plan for Non-Employee Directors

The ONEOK, Inc. Nonqualified Deferred Compensation Plan for Non-Employee Directors provides our directors, who are not our employees, the option to defer all or a portion of their compensation for their service on our Board of Directors.  Under the plan, directors may elect either a cash deferral option or a phantom stock option.  Under the cash deferral option, directors may defer the receipt of all or a portion of their annual retainer fees, plus accrued interest.  Under the phantom stock option, directors may defer all or a portion of their annual retainer fees and receive such fees on a deferred basis in the form of shares of common stock under our Long-Term Incentive Plan or Equity Compensation Plan.  Shares are distributed to nonemployee directors at the fair market value of our common stock at the date of distribution.

XML

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2011

COMMITMENTS AND CONTINGENCIES [Abstract]

COMMITMENTS AND CONTINGENCIES

Q.           COMMITMENTS AND CONTINGENCIES

Commitments - Operating leases represent future minimum lease payments under noncancelable equipment leases covering office space, pipeline equipment, rights of way and vehicles.  Firm transportation and storage contracts are fixed-price contracts that provide us with firm transportation and storage capacity.  Rental expense in 2011, 2010 and 2009 was not material.  The following table sets forth our operating lease and firm transportation and storage contract payments for the periods indicated:

ONEOK		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	1.2		$	122.4	$	123.6
2013		0.9			87.5		88.4
2014		0.6			68.2		68.8
2015		0.3			42.9		43.2
2016		-			26.4		26.4
Thereafter		-			23.2		23.2
Total	$	3.0		$	370.6	$	373.6

ONEOK Partners		Operating Leases	Firm Transportation and Storage Contracts				Total
		(Millions of dollars)
2012	$	3.4		$	9.0	$	12.4
2013		2.8			6.5		9.3
2014		2.8			6.2		9.0
2015		1.3			6.1		7.4
2016		1.0			4.7		5.7
Thereafter		6.4			5.7		12.1
Total	$	17.7		$	38.2	$	55.9

Environmental Liabilities - We are subject to multiple historical and wildlife preservation laws and environmental regulations affecting many aspects of our present and future operations.  Regulated activities include those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, hazardous materials transportation, and pipeline and facility construction.  These laws and regulations require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals.  Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations.  If a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including response, investigation and cleanup costs, which could affect materially our results of operations and cash flows.  In addition, emission controls required under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.  We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us.  Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We own or retain legal responsibility for the environmental conditions at 12 former manufactured natural gas sites in Kansas.  These sites contain potentially harmful materials that are subject to control or remediation under various environmental laws and regulations.  A consent agreement with the KDHE presently governs all work at these sites.  The terms of the consent agreement allow us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis.  Remediation typically involves the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater.

Of the 12 sites, we have begun soil remediation on 11 sites.  Regulatory closure has been achieved at three locations, and we have completed or are near completion of soil remediation at eight sites.  We have begun site assessment at the remaining site where no active remediation has occurred. 

Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during 2011, 2010 or 2009.

In May 2010, the EPA finalized the “Tailoring Rule” that will regulate greenhouse gas emissions at new or modified facilities that meet certain criteria.  Affected facilities will be required to review best available control technology, conduct air-quality analysis, impact analysis and public reviews with respect to such emissions.  The rule was phased in beginning January 2011, and at current emission threshold levels, we believe it will have a minimal impact on our existing facilities.  The EPA has stated it will consider lowering the threshold levels over the next five years, which could increase the impact on our existing facilities; however, potential costs, fees or expenses associated with the potential adjustments are unknown.

In addition, the EPA has issued a rule on air-quality standards, “National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines,” also known as RICE NESHAP, with a compliance date in 2013.  The rule will require capital expenditures over the next two years for the purchase and installation of new emissions-control equipment.  We do not expect these expenditures to have a material impact on our results of operations, financial position or cash flows.

On July 28, 2011, the EPA issued a proposed rule package that would change the air emission New Source Performance Standards and Maximum Achievable Control Technology requirements applicable to natural gas production, processing, transmission and underground storage.  The proposed rules would impact emission limits for specific equipment through the use of controls; however, potential costs associated with the proposed rules are currently unknown.

Pipeline Safety - We are subject to Pipeline and Hazardous Materials Safety Administration regulations, including integrity- management regulations.  The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas.  In January 2012, The Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011 was signed into law.  The new law increased the maximum penalties for violating federal pipeline safety regulations and directs the Department of Transportation and Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us.  These issues include but are not limited to:

·   an evaluation of whether natural gas liquid and natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;

·   a review of all natural gas and hazardous natural gas liquid gathering pipeline exemptions;

·   a verification of records for pipelines in class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and

·   a requirement to test pipelines previously untested in high-consequence areas operating above 30 percent yield strength.

The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.

Financial Markets Legislation - The Dodd-Frank Act represents a far-reaching overhaul of the framework for regulation of United States financial markets.  Various regulatory agencies, including the SEC and the CFTC, have proposed regulations for implementation of many of the provisions of the Dodd-Frank Act.  Although the CFTC has issued final regulations for certain provisions of the Dodd-Frank Act, many remain outstanding.  In November 2011, the CFTC published final rules on speculative position limits, which we do not expect to impact directly our current risk-management practices.  In December 2011, the CFTC issued an order that further defers the effective date of the provisions of the Dodd-Frank Act that require a rulemaking, such as definitions of certain terms, until the earlier of the effective date of the final rule defining the reference terms or July 16, 2012.  Until the remaining final regulations are established, we are unable to ascertain how we may be affected by them.  Based on our assessment of the regulations issued to date and those proposed, we expect to be able to continue to participate in financial markets for hedging certain risks inherent in our business, including commodity and interest-rate risks; however, the costs of doing so may increase as a result of the new legislation.  We also may incur additional costs associated with our compliance with the new regulations and anticipated additional record keeping, reporting and disclosure obligations; however, we do not believe the costs will be material.  These requirements could affect adversely market liquidity and pricing of derivative contracts making it more difficult to execute our risk-management strategies in the future.  Also, the anticipated increased costs of compliance by dealers and counterparties likely will be passed on to customers, which could decrease the benefits of hedging to us and could reduce our profitability and liquidity.

Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations.  While the results of litigation and claims cannot be predicted with certainty, and we are unable to estimate reasonably possible losses, we believe the probable final outcome of such matters will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

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FAIR VALUE MEASUREMENTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commodity contracts
Energy marketing and risk management assets	$ 15,016,000	$ 7,703,000
Commodity contracts
Energy marketing and risk management liabilities	629,000	1,053,000
Cash collateral held	73,300,000	82,500,000
Cash collateral posted	1,700,000	1,100,000
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning	19,730,000	2,074,000
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of December 31	14,768,000	17,550,000
Total realized/unrealized gains (losses):
Included in earnings	(6,172,000)	13,422,000
Included in other comprehensive income (loss)	5,443,000	11,122,000
Transfers into Level 3	1,428,000	765,000
Transfers out of Level 3	(2,608,000)	(7,653,000)
Balance, ending	17,821,000	19,730,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	5,600,000,000	4,700,000,000
Derivative Financial Instruments, Assets Liabilities [Member]
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning	49,266,000	136,694,000
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of December 31	21,349,000	22,101,000
Total realized/unrealized gains (losses):
Included in earnings	(28,425,000)	(91,662,000)
Included in other comprehensive income (loss)	5,443,000	11,122,000
Transfers into Level 3	1,428,000	765,000
Transfers out of Level 3	(2,608,000)	(7,653,000)
Balance, ending	25,104,000	49,266,000
Firm Commitments [Member]
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning	(29,536,000)	(134,620,000)
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held as of December 31	(6,581,000)	(4,551,000)
Total realized/unrealized gains (losses):
Included in earnings	22,253,000	105,084,000
Included in other comprehensive income (loss)	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, ending	(7,283,000)	(29,536,000)
Fair Value, Measurements, Recurring [Member]
Commodity contracts
Energy marketing and risk management assets	15,000,000	7,700,000
Commodity contracts
Energy marketing and risk management liabilities	600,000	1,100,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity contracts
Financial contracts	545,247,000	127,789,000
Physical contracts	0	0
Netting	0	0
Total derivatives	545,247,000	127,789,000
Trading securities	5,749,000	7,591,000
Available-for-sale investment securities	1,949,000	2,574,000
Total assets	552,945,000	137,954,000
Commodity contracts
Financial contracts	(479,073,000)	(64,768,000)
Physical contracts	0	0
Netting	0	0
Interest-rate contracts	0
Total derivatives	(479,073,000)	(64,768,000)
Fair value of firm commitments	0	0
Total liabilities	(479,073,000)	(64,768,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Commodity contracts
Financial contracts	13,874,000	1,755,000
Physical contracts	23,879,000	13,185,000
Netting	0	0
Total derivatives	37,753,000	14,940,000
Trading securities	0	0
Available-for-sale investment securities	0	0
Total assets	37,753,000	14,940,000
Commodity contracts
Financial contracts	(6,498,000)	(3,241,000)
Physical contracts	(261,000)	(3,763,000)
Netting	0	0
Interest-rate contracts	(128,666,000)
Total derivatives	(135,425,000)	(7,004,000)
Fair value of firm commitments	0	0
Total liabilities	(135,425,000)	(7,004,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity contracts
Financial contracts	32,931,000	152,639,000
Physical contracts	14,916,000	20,391,000
Netting	0	0
Total derivatives	47,847,000	173,030,000
Trading securities	0	0
Available-for-sale investment securities	0	0
Total assets	47,847,000	173,030,000
Commodity contracts
Financial contracts	(20,995,000)	(119,430,000)
Physical contracts	(1,748,000)	(4,334,000)
Netting	0	0
Interest-rate contracts	0
Total derivatives	(22,743,000)	(123,764,000)
Fair value of firm commitments	(7,283,000)	(29,536,000)
Total liabilities	(30,026,000)	(153,300,000)
Fair Value, Measurements, Recurring [Member] | Netting and Collateral [Member]
Commodity contracts
Financial contracts	0	0
Physical contracts	0	0
Netting	(569,243,000)	(251,898,000)
Total derivatives	(569,243,000)	(251,898,000)
Trading securities	0	0
Available-for-sale investment securities	0	0
Total assets	(569,243,000)	(251,898,000)
Commodity contracts
Financial contracts	0	0
Physical contracts	0	0
Netting	497,608,000	170,515,000
Interest-rate contracts	0
Total derivatives	497,608,000	170,515,000
Fair value of firm commitments	0	0
Total liabilities	497,608,000	170,515,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commodity contracts
Financial contracts	592,052,000	282,183,000
Physical contracts	38,795,000	33,576,000
Netting	(569,243,000)	(251,898,000)
Total derivatives	61,604,000	63,861,000
Trading securities	5,749,000	7,591,000
Available-for-sale investment securities	1,949,000	2,574,000
Total assets	69,302,000	74,026,000
Commodity contracts
Financial contracts	(506,566,000)	(187,439,000)
Physical contracts	(2,009,000)	(8,097,000)
Netting	497,608,000	170,515,000
Interest-rate contracts	(128,666,000)
Total derivatives	(139,633,000)	(25,021,000)
Fair value of firm commitments	(7,283,000)	(29,536,000)
Total liabilities	$ (146,916,000)	$ (54,557,000)

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2011

INCOME TAXES [Abstract]

Provisions for Income Taxes

The following table sets forth our provisions for income taxes for the periods indicated:

	Years Ended December 31,
	2011				2010		2009
Current income taxes	(Thousands of dollars)
Federal	$	(32,291	)		$	58,844	$	2,664
State		1,707				12,629		1,604
Total current income taxes from continuing operations		(30,584	)	(a)		71,473		4,268
Deferred income taxes
Federal		228,257				124,126		170,100
State		28,375				18,121		28,640
Total deferred income taxes from continuing operations		256,632		(a)		142,247		198,740
Total provision for income taxes from continuing operations		226,048				213,720		203,008
Discontinued operations		1,255				114		4,313
Total provision for income taxes	$	227,303			$	213,834	$	207,321
(a) Includes a $37.7 million reclassification from current income taxes to deferred related to revisions of estimated depreciation in our filed tax returns compared with our 2010 tax provision.

Reconciliation of Income Tax Provision

The following table is a reconciliation of our income tax provision from continuing operations for the periods indicated:

	Years Ended December 31,
	2011			2010			2009
	(Thousands of dollars)
Income from continuing operations before income taxes	$	983,562		$	753,778		$	686,665
Less: Net income attributable to noncontrolling interest		399,150			206,698			185,753
Income from continuing operations attributable to ONEOK    before income taxes		584,412			547,080			500,912
Federal statutory income tax rate		35	%		35	%		35	%
Provision for federal income taxes		204,543			191,478			175,319
State income taxes, net of federal tax benefit		20,334			19,946			19,625
Other, net		1,171			2,296			8,064
Income tax provision from continuing operations	$	226,048		$	213,720		$	203,008

Schedule of Deferred Tax Assets and Liabilities

The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated.

	December 31,		December 31,
	2011		2010
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	136,997	$	89,480
Other comprehensive income		134,037		73,515
Other		31,544		25,694
Total deferred tax assets		302,578		188,689
Deferred tax liabilities
Excess of tax over book depreciation and depletion		664,415		519,627
Investment in partnerships		851,408		729,682
Regulatory assets		200,010		157,756
Total deferred tax liabilities		1,715,833		1,407,065
Net deferred tax liabilities before discontinued operations		1,413,255		1,218,376
Discontinued operations		82		26
Net deferred tax liabilities	$	1,413,337	$	1,218,402

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 65,953	$ 30,341
Accounts receivable, net	1,339,933	1,283,891
Gas and natural gas liquids in storage	549,915	706,912
Commodity imbalances	63,452	94,854
Energy marketing and risk management assets (Notes C and D)	40,280	54,691
Other current assets	185,143	149,521
Assets of discontinued operations (Note B)	74,136	59,525
Total current assets	2,318,812	2,379,735
Property, plant and equipment
Property, plant and equipment	11,177,934	9,853,821
Accumulated depreciation and amortization	2,733,601	2,540,873
Net property, plant and equipment (Note E)	8,444,333	7,312,948
Investments and other assets
Goodwill and intangible assets (Note F)	1,014,127	1,022,894
Investments in unconsolidated affiliates (Note O)	1,223,398	1,188,124
Other assets	695,965	595,474
Total investments and other assets	2,933,490	2,806,492
Total assets	13,696,635	12,499,175
Current liabilities
Current maturities of long-term debt (Note H)	364,391	643,236
Notes payable (Note G)	841,982	556,855
Accounts payable	1,341,718	1,212,323
Commodity imbalances	202,206	288,494
Energy marketing and risk management liabilities (Notes C and D)	137,680	22,066
Other current liabilities	345,383	416,248
Liabilities of discountinued operations (Note B)	12,815	12,209
Total current liabilities	3,246,175	3,151,431
Long-term debt, excluding current maturities (Note H)	4,529,551	3,686,542
Deferred credits and other liabilities
Deferred income taxes	1,446,591	1,171,997
Other deferred credits	674,586	568,364
Total deferred credits and other liabilities	2,121,177	1,740,361
Commitments and contingencies (Note Q)
ONEOK shareholders' equity:
Common stock, $0.01 par value: authorized 300,000,000 shares; issued 122,904,924 shares and outstanding 103,254,980 shares at December 31, 2011; issued 122,815,636 shares and outstanding 106,815,582 shares at December 31, 2010	1,229	1,228
Paid-in capital	1,418,414	1,392,671
Accumulated other comprehensive loss (Note J)	(206,121)	(108,802)
Retained earnings	1,960,374	1,826,800
Treasury stock, at cost: 19,649,944 shares at December 31, 2011 and 16,000,054 shares at December 31, 2010	(935,323)	(663,274)
Total ONEOK shareholders' equity	2,238,573	2,448,623
Noncontrolling interests in consolidated subsidiaries	1,561,159	1,472,218
Total equity	3,799,732	3,920,841
Total liabilities and equity	$ 13,696,635	$ 12,499,175

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2011

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A.           SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Operations- We are a diversified energy company and successor to the company founded in 1906 known as Oklahoma Natural Gas Company.  We are a corporation incorporated under the laws of the state of Oklahoma, and our common stock is listed on the NYSE under the trading symbol “OKE.”  We are the sole general partner and own 42.8 percent of ONEOK Partners, L.P. (NYSE: OKS), one of the largest publicly traded master limited partnerships.

We have divided our operations into three reportable business segments as follows:

·   ONEOK Partners;

·   Natural Gas Distribution; and

·   Energy Services.

ONEOK Partners is a diversified master limited partnership involved in the gathering, processing, storage and transportation of natural gas in the United States.  In addition, ONEOK Partners owns one of the nation’s premier natural gas liquids systems, connecting NGL supply in the Mid-Continent and Rocky Mountain regions with key market centers.  To aid in understanding the important business and financial characteristics of our ONEOK Partners segment, the following describes its business with reference to its underlying activities.

ONEOK Partners’ natural gas gathering and processing business is engaged in the gathering and processing of natural gas produced from crude oil and natural gas wells, primarily in the Mid-Continent and Rocky Mountain regions.  These regions include the NGL-rich Cana-Woodford Shale and Granite Wash formations; the Mississippian Lime formation of Oklahoma and Kansas; Hugoton and Central Kansas Uplift Basins of Kansas; the Williston Basin of Montana and North Dakota that includes the oil-producing, NGL-rich Bakken Shale and Three Forks formations; and the Powder River Basin of Wyoming.  In the Powder River Basin, the natural gas that ONEOK Partners gathers is coal-bed methane, or dry, natural gas that does not require processing or NGL extraction in order to be marketable.  Dry natural gas is gathered, compressed and delivered into a downstream pipeline or marketed for a fee.

ONEOK Partners’ natural gas pipeline business operates interstate and intrastate natural gas transmission pipelines, natural gas storage facilities and nonprocessable natural gas gathering facilities.  ONEOK Partners’ FERC-regulated interstate assets transport natural gas through pipelines that access supply from Canada and from the Mid-Continent, Rocky Mountain and Gulf Coast regions.  ONEOK Partners’ intrastate natural gas pipeline assets are located in Oklahoma, Texas and Kansas, and have access to major natural gas producing areas in those states, including the Cana-Woodford, Granite Wash and Mississippian Lime formations.  ONEOK Partners owns underground natural gas storage facilities in Oklahoma, Kansas and Texas, which are connected to its intrastate natural gas pipeline assets.

ONEOK Partners’ natural gas liquids business consists of facilities that gather, fractionate and treat NGLs and store NGL products primarily in Oklahoma, Kansas and Texas.  Its natural gas liquids business owns or has an ownership interest in FERC-regulated natural gas liquids gathering and distribution pipelines in Oklahoma, Kansas, Texas, Wyoming and Colorado and terminal and storage facilities in Missouri, Nebraska, Iowa and Illinois.  It also owns FERC-regulated natural gas liquids distribution and refined petroleum products pipelines in Kansas, Missouri, Nebraska, Iowa and Illinois that connect its Mid-Continent assets with Midwest markets, including Chicago, Illinois.  ONEOK Partners’ natural gas liquids business also owns and operates truck and rail-loading and unloading facilities that interconnect with its fractionation and pipeline assets.

Our Natural Gas Distribution segment provides natural gas distribution services to more than 2 million customers in Oklahoma, Kansas and Texas through Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service.  We serve residential, commercial, industrial and transportation customers in all three states.  In addition, our natural gas distribution companies serve wholesale and public authority customers.

Our Energy Services segment is a provider of nonuniform natural gas supply and risk-management services for natural gas and electric utilities and commercial and industrial customers with natural gas needs.  We use a network of leased storage and transportation capacity to supply natural gas to our customers.  This network connects the major supply and demand centers throughout the United States and into Canada and, coupled with our industry knowledge and market intelligence, allows us to provide our customers with customized services in a more efficient and reliable manner than they can achieve independently.  Our customers are primarily LDCs, electric utilities and commercial and industrial end-users.  Our customers’ natural gas needs vary with seasonal changes in weather and are therefore somewhat unpredictable.

Consolidation - Our consolidated financial statements include the accounts of ONEOK and our subsidiaries over which we have control.  We have recorded noncontrolling interests in consolidated subsidiaries on our Consolidated Balance Sheets to recognize the percent of ONEOK Partners that we do not own.  We reflected our ownership interest in ONEOK Partners’ accumulated other comprehensive income (loss) in our consolidated accumulated other comprehensive income (loss).  The remaining portion is reflected as an adjustment to noncontrolling interests in consolidated subsidiaries.  All significant intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee; conversely, if we do not have the ability to exercise significant influence, then we use the cost method.  Impairment of equity and cost method investments is recorded when the impairments are other than temporary.  Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment.  The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates - The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements.  These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period.  Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets and liabilities, obligations under employee benefit plans, provisions for uncollectible accounts receivable, unbilled revenues for natural gas delivered but for which meters have not been read, gas purchased expense for natural gas purchased but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other recorded or disclosed amounts.

We evaluate these estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances.  Nevertheless, actual results may differ significantly from the estimates.  Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements -We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  Inputs into our fair value estimates include commodity exchange prices, over-the-counter quotes, volatility, historical correlations of pricing data and LIBOR and other liquid money market instrument rates.  We also utilize internally developed basis curves that incorporate observable and unobservable market data.  We validate our valuation inputs with third-party information and settlement prices from other sources, where available.  In addition, as prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  We also take into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions.  We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using specific and sector bond yields and also monitor the credit default swap markets.  Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be material.

The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value.  The levels of the hierarchy are described below:

·   Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;

·   Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date.  Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and

·   Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate.  These unobservable inputs are developed based on the best information available and may include our own internal data.

We recognize transfers into and out of Level 3 as of the end of each reporting period.  Transfers into Level 3 represent existing assets or liabilities that were categorized previously at a higher level for which the unobservable inputs became a more significant portion of the fair value estimates.  Transfers out of Level 3 represent existing assets and liabilities that were classified previously as Level 3 for which the observable inputs became a more significant portion of the fair value estimates.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data.  We categorize derivatives for which fair value is determined using multiple inputs within a single level, based on the lowest level input that is significant to the fair value measurement in its entirety.  See Note C for additional disclosures of our fair value measurements.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition- Our operating segments recognize revenue when services are rendered or product is delivered.  ONEOK Partners’ natural gas gathering and processing operations record revenue when gas is processed in or transported through its facilities.  ONEOK Partners’ natural gas liquids operations record revenues based upon contracted services and actual volumes exchanged or stored under service agreements in the period services are provided.  Revenue for ONEOK Partners’ natural gas pipelines and a portion of its natural gas liquids operations is recognized based upon contracted capacity and contracted volumes transported and stored under service agreements in the period services are provided.

Our Natural Gas Distribution segment’s major industrial and commercial natural gas distribution customers are invoiced at the end of each month.  All natural gas distribution residential customers, all retail customers and some distribution commercial customers are invoiced on a cyclical basis throughout the month, and we accrue unbilled revenues at the end of each month.

Our Energy Services segment’s wholesale customers are invoiced at the end of each month based on physical sales.  Demand payments received for requirements contracts are recognized in the period in which the service is provided.  Our fixed-price physical sales are accounted for as derivatives and are recorded at fair value.  See discussion below in “Derivative and Risk Management Activities” for additional information.

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered, net of allowances for doubtful accounts.  We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate.  Outstanding customer receivables are reviewed regularly for possible nonpayment indicators and allowances for doubtful accounts are recorded based upon management’s estimate of collectability at each balance sheet date.  At December 31, 2011 and 2010, our allowance for doubtful accounts was not material.

Inventories - The values of current natural gas and NGLs in storage are determined using the lower of weighted-average cost or market method.  Noncurrent natural gas and NGLs are classified as property and valued at cost.  Materials and supplies are valued at average cost.

Commodity Imbalances -Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at fair value.  Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty.  In turn, we deliver NGL products back to the customer and charge them gathering and fractionation fees.  To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties.  These net exchange receivables and payables are settled with movements of NGL products rather than with cash.  Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines’ tariffs or by agreement.

Derivatives and Risk Management Activities - We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.

If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values, cash flows or foreign currency.  Certain nontrading derivative transactions, which are economic hedges of our accrual transactions such as our storage and transportation contracts, do not qualify for hedge accounting treatment.

The table below summarizes the various ways in which we account for our derivative instruments and the impact on our consolidated financial statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the derivative instrument is recognized in earnings
	-	Effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	Effective portion of the gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

Gains or losses associated with the fair value of derivative instruments entered into by our Natural Gas Distribution segment are included in, and recoverable through, the monthly purchased-gas cost mechanism.

We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness.  We specifically identify the asset, liability, firm commitment or forecasted transaction that has been designated as the hedged item.  We assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on our cash flow and fair value hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis.  We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The presentation of settled derivative instruments on either a gross or net basis in our Consolidated Statements of Income is dependent on the relevant facts and circumstances of our different types of activities rather than based solely on the terms of the individual contracts.  All financially settled derivative instruments, as well as derivative instruments considered held for trading purposes that result in physical delivery, are reported on a net basis in revenues in our Consolidated Statements of Income.  The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and nonderivative contracts are reported on a gross basis.  Derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are also reported on a gross basis.

Revenues in our Consolidated Statements of Income include financial trading margins, as well as certain physical natural gas transactions with our trading counterparties.  Revenues and cost of sales and fuel from such physical transactions are reported on a net basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes C and D for more discussion of our fair value measurements and risk management and hedging activities using derivatives.

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC.  Generally, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation.  Gains and losses from sales or retirement of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income.  Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC represents the cost of borrowed funds used to finance construction activities.  We capitalize interest costs during the construction or upgrade of qualifying assets.  Interest costs capitalized in 2011, 2010 and 2009 were $24.0 million, $4.9 million and $17.0 million, respectively.  Capitalized interest is recorded as a reduction to interest expense.  The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives.  Generally, we apply composite depreciation rates to functional groups of property having similar economic circumstances.  We periodically conduct depreciation studies to assess the economic lives of our assets.  For our regulated assets, these depreciation studies are completed as a part of our rate proceedings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are billed.  For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively.  Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

Property, plant and equipment on our Consolidated Balance Sheets includes construction work in progress for capital projects that have not yet been placed in service and therefore are not being depreciated.  Assets are transferred out of construction work in progress when they are substantially complete and ready for their intended use.

See Note E for disclosures of our property, plant and equipment.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill and indefinite-lived intangible assets for impairment at least annually as of July 1.  As part of our impairment test, an initial assessment is made by comparing the fair value of a reporting unit with its book value, including goodwill.  If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the impairment.  In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets of the reporting unit from the fair value determined in step one of the assessment.  If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.  There were no impairment charges resulting from our 2011, 2010 or 2009 impairment tests.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective.  Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates.  Under the market approach, we apply multiples to forecasted cash flows.  The multiples used are consistent with historical asset transactions.  The forecasted cash flows are based on average forecasted cash flows over a period of years.

As part of our indefinite-lived intangible asset impairment test, we compare the estimated fair value of our indefinite-lived intangible assets with their book values.  The fair value of our indefinite-lived intangible assets is estimated using the market approach.  Under the market approach, we apply multiples to forecasted cash flows of the assets associated with our indefinite-lived intangible assets.  The multiples used are consistent with historical asset transactions.  We determined that there were no impairments to our indefinite-lived intangible asset in 2011, 2010 or 2009.

We assess our long-lived assets, including intangible assets with finite useful lives, for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable.  An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset.  If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.  We determined that there were no asset impairments in 2011, 2010 or 2009.

For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary.  Therefore, we periodically reevaluate the amount at which we carry our equity method investments to determine whether current events or circumstances warrant adjustments to our carrying value.  We determined that there were no impairments to our investments in unconsolidated affiliates in 2011, 2010 or 2009.

Our impairment tests require the use of assumptions and estimates such as industry economic factors and the profitability of future business strategies.  If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Notes E and F for our goodwill and long-lived assets disclosures.

Regulation - Our natural gas distribution operations and ONEOK Partners’ intrastate natural gas transmission pipelines are subject to the rate regulation and accounting requirements of the OCC, KCC, RRC and various municipalities in Texas.  ONEOK Partners’ interstate natural gas and natural gas liquids pipelines are subject to regulation by the FERC.  In Kansas and Texas, natural gas storage may be regulated by the state and the FERC for certain types of services.  Oklahoma Natural Gas, Kansas Gas Service, Texas Gas Service and portions of our ONEOK Partners segment follow the accounting and reporting guidance for regulated operations.  During the rate-making process, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time, as opposed to expensing such costs as incurred.  Examples include costs for fuel and fuel losses, acquisition costs and contributions in aid of construction.  This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery.  Actions by regulatory authorities could have an effect on the amount recovered from rate payers.  Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action.  A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer:

·   established by independent, third-party regulators;

·   designed to recover the specific entity’s costs of providing regulated services; and

·   set at levels that will recover our costs when considering the demand and competition for our services.

At December 31, 2011 and 2010, we recorded regulatory assets of approximately $539.7 million and $463.9 million, respectively, which are being recovered as a result of various approved rate proceedings or are expected to be recovered.  Of these amounts, approximately $466.6 million and $375.1 million relate to our pension and postretirement benefit plans at December 31, 2011 and 2010, respectively, which are discussed on page 107.  Regulatory assets are being recovered as a result of approved rate proceedings over varying time periods up to 40 years.  These assets are reflected in other assets on our Consolidated Balance Sheets.

Pension and Postretirement Employee Benefits - We have defined benefit retirement plans covering certain full-time employees.  We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees who retire with at least five years of service.  Our actuarial consultant calculates the expense and liability related to these plans and uses statistical and other factors that attempt to anticipate future events.  These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and employment periods.  In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the costs and liabilities we recognize.  See Note M for more discussion of pension and postretirement employee benefits.

Income Taxes - Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carry-forward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse.  The effect on deferred taxes of a change in tax rates is deferred and amortized for operations regulated by the OCC, KCC, RRC and various municipalities in Texas if, as a result of an action by a regulator, it is probable that the effect of the change in tax rates will be recovered from or returned to customers through future rates.  For all other operations, the effect is recognized in income in the period that includes the enactment date.  We continue to amortize previously deferred investment tax credits for ratemaking purposes over the period prescribed by the OCC, KCC, RRC and various municipalities in Texas.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return.  We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute.  During 2011, 2010 and 2009, our tax positions did not require an establishment of a material reserve.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States and Canada, along with the tax authorities of several states.  There are no United States federal audits or statute waivers at this time.  We have been notified by the state of Texas of its intent to audit tax years 2008-2011.  See Note N for additional discussion of income taxes.

Asset Retirement Obligations - Asset retirement obligationsrepresent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset.  We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made.  We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets because the settlement dates are indeterminable.  For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset.  The liability is accreted at the end of each period through charges to operating expense.  If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement.  The depreciation and amortization expense are immaterial to our consolidated financial statements.

In accordance with long-standing regulatory treatment, we collect through rates the estimated costs of removal on certain regulated properties through depreciation expense, with a corresponding credit to accumulated depreciation and amortization.  These removal costs are nonlegal obligations; however, the amounts collected that are in excess of these nonlegal asset-removal costs incurred are accounted for as a regulatory liability.  Historically, the regulatory authorities that have jurisdiction over our regulated operations have not required us to quantify this amount; rather, these costs are addressed prospectively in depreciation rates and are set in each general rate order.  We have made an estimate of our regulatory liability using current rates since the last general rate order in each of our jurisdictions; however, significant uncertainty exists regarding the ultimate determination of this liability, pending, among other issues, clarification of regulatory intent.  We continue to monitor the regulatory authorities, and the liability may be adjusted as more information is obtained.  We record the estimated nonlegal asset removal obligation in noncurrent liabilities in other deferred credits on our Consolidated Balance Sheets.  To the extent this estimated liability is adjusted, such amounts will be reclassified between accumulated depreciation and amortization and other deferred credits and therefore will not have an impact on earnings.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures.  We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably.  We base our estimates on currently available facts and our estimates of the ultimate outcome or resolution.  Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study.  Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable.  Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.  See Note Q for additional discussion of contingencies.

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures.  We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

Earnings per Common Share - Basic EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period.  Diluted EPS is calculated based on the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components.  The dilutive components are calculated based on the dilutive effect for each quarter.  For fiscal year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

Recently Issued Accounting Standards Update -In January 2010, the FASB issued ASU 2010-06, “Improving Disclosures about Fair Value Measurements,” which requires separate disclosures of purchases, sales, issuances and settlements in the reconciliation of our Level 3 fair value measurements.  We adopted this guidance with our March 31, 2011, Quarterly Report, and the impact was not material.  Other provisions of ASU 2010-06 were adopted in 2010.

In May 2011, the FASB issued ASU 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (IFRS),” which provides a consistent definition of fair value and common requirements for measurement of and disclosure about fair value between GAAP and IFRS.  This new guidance changes some fair value measurement principles and disclosure requirements.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In June 2011, the FASB issued ASU 2011-05, “Presentation of Comprehensive Income,” which provides two options for presenting items of net income, comprehensive income and total comprehensive income by creating either one continuous statement of comprehensive income or two separate consecutive statements, and requires certain other disclosures.  In December 2011, the FASB issued ASU 2011-12, “Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05,” which deferred certain presentation requirements in ASU 2011-05 for items reclassified out of accumulated other comprehensive income.  We expect the impact of this guidance to be immaterial when we adopt it beginning with our March 31, 2012, Quarterly Report.

In September 2011, the FASB issued ASU 2011-08, “Testing Goodwill for Impairment,” which permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount.  Under the amendments in this update, an entity is not required to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying amount.  An entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.  An entity may also resume performing the qualitative assessment in any subsequent period.  We will adopt this guidance beginning with our July 1, 2012, goodwill impairment test.

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SHARE-BASED PAYMENTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Range of Exercise Prices 1 [Member]
Stock options outstanding and exercisable by exercise price range [Abstract]
Year-end closing stock price (in dollars per share)	$ 86.69
Exercise Price Range, Lower Range Limit	$ 16.88
Exercise Price Range, Upper Range Limit	$ 25.32
Number of Awards (in shares)	29,650
Weighted Average Remaining Life (in years)	1.02
Weighted Average Exercise Price (in dollars per share)	$ 17.03
Aggregate Intrinsic Value	$ 2,065,000
Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under the Plan. (in shares)	5,000,000
Shares reserved for issuance under the plan (in shares)	2,200,000
Forfeiture rate minimum (in hundredths)	0.00%
Forfeiture rate maximum (in hundredths)	12.00%
Share based compensation expense	40,700,000	15,900,000	15,100,000
Share based compensation tax benefit	25,700,000	10,000,000	9,500,000
Cash received from the exercise of awards under all share-based payment arrangements	900,000	6,000,000	3,300,000
Tax benefit realized for the anticipated tax deductions of the exercise of share-based payment arrangements	1,800,000	3,400,000	900,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards vesting period (in years)	Three
Weighted Average Price [Abstract]
Nonvested beginning balance (in dollars per share)	$ 35.07
Granted (in dollars per share)	$ 57.00	$ 37.33	$ 23.47
Released to participants (in dollars per share)	$ 29.26
Forfeited (in dollars per share)	$ 42.96
Nonvested ending balance (in dollars per share)	$ 41.57	$ 35.07
Fair value of shares granted	11,728,000	8,206,000	2,251,000
Unrecognized compensation cost related to our nonvested restricted stock unit awards	10,500,000
Period over which compensation cost related to nonvested restricted stock will be recognized (in years)	1.13
Restricted stock units and performance stock units activity [Roll forward]
Nonvested beginning balance (in shares)	488,786
Granted (in shares)	205,750
Released to participants (in shares)	(1,271)
Forfeited (in shares)	(8,928)
Nonvested ending balance (in shares)	684,337	488,786
Volatility (in hundredths)		40.60%	43.58%
Dividend Yield (in hundredths)		4.12%	5.70%
Risk-free Interest Rate (in hundredths)		1.47%	1.01%
Performance Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards vesting period (in years)	Three
Forfeiture rate minimum (in hundredths)	0.00%
Forfeiture rate maximum (in hundredths)	200.00%
Weighted Average Price [Abstract]
Nonvested beginning balance (in dollars per share)	$ 40.30
Granted (in dollars per share)	$ 69.35	$ 48.09	$ 29.34
Forfeited (in dollars per share)	$ 46.12
Nonvested ending balance (in dollars per share)	$ 47.36	$ 40.30
Fair value of shares granted	29,186,000	20,738,000	17,232,000
Unrecognized compensation cost related to our nonvested restricted stock unit awards	7,400,000
Period over which compensation cost related to nonvested restricted stock will be recognized (in years)	1.09
Restricted stock units and performance stock units activity [Roll forward]
Nonvested beginning balance (in shares)	1,314,587
Granted (in shares)	420,850
Forfeited (in shares)	(19,276)
Nonvested ending balance (in shares)	1,716,161	1,314,587
Volatility (in hundredths)	39.91%
Dividend Yield (in hundredths)	3.30%
Risk-free Interest Rate (in hundredths)	1.33%
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under the Plan. (in shares)	7,800,000
The maximum number of shares for which options or other awards may be granted to any employee during any year (in shares)	300,000
Non-employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under the Plan. (in shares)	700,000
The maximum number of shares for which options or other awards may be granted to any employee during any year (in shares)	20,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeiture period from grant date (in years)	Ten
Number of Shares [Abstract]
Beginning balance (in shares)	135,190
Exercised (in shares)	(105,540)
Ending balance (in shares)	29,650	135,190
Exercisable at end of period (in shares)	29,650
Weighted Average Price [Abstract]
Beginning balance (in dollars per share)	$ 21.52
Exercised (in dollars per share)	$ 22.78
Ending balance (in dollars per share)	$ 17.03	$ 21.52
Exercisable at end of period (in dollars per share)	$ 17.03
Intrinsic value of options exercised	4,756,000	8,953,000	2,453,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under the Plan. (in shares)	4,800,000
Restricted stock units and performance stock units activity [Roll forward]
Maximum allowable percentage of annual base pay withheld to purchase our common stock (in hundredths)	10.00%
Maximum allowable percentage of annual base pay from all means to purchase our common stock (in hundredths)	10.00%
Purchase price percentage of the lower of its grant date or exercise date market price (in hundredths)	85.00%
Percentage of employees participating in the Employee Stock Purchase Plan (in hundredths)	56.00%	53.00%	53.00%
Compensation expense for the Employee Stock Purchase Plan	7,200,000	3,900,000	6,500,000
Shares sold under the Employee Stock Purchase Plan (in shares)	182,558	216,897	321,888
Share price of shares sold under the Employee Stock Purchase Plan (in dollars per share)	47.39	37.95	24.41
Employee Stock Award Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under the Plan. (in shares)	300,000
Shares reserved for issuance under the plan (in shares)	147,847
Share based compensation expense	$ 16,000,000
Description of the Plan	Under our Employee Stock Award Program, we issued, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE was for the first time at or above $26 per share.

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SEGMENTS

12 Months Ended

Dec. 31, 2011

SEGMENTS [Abstract]

SEGMENTS

R.           SEGMENTS

Segment Descriptions - Our operations are divided into three reportable business segments as follows:  (i) our ONEOK Partners segment reflects the consolidated operations of ONEOK Partners.  We own a 42.8-percent ownership interest and control ONEOK Partners through our ownership of its general partner interest.  ONEOK Partners gathers, processes, treats, transports, stores and sells natural gas and gathers, treats, fractionates, stores, distributes and markets NGLs.  We and ONEOK Partners maintain significant financial and corporate governance separations.  We seek to receive increasing cash distributions as a result of our investment in ONEOK Partners, and our investment decisions are made based on the anticipated returns from ONEOK Partners in total, not specific to any of its businesses individually; (ii) our Natural Gas Distribution segment is comprised of our regulated public utilities that deliver natural gas to residential, commercial and industrial customers, and transport natural gas; and (iii) our Energy Services segment markets natural gas to wholesale customers.  Other and eliminations consist of the operating and leasing operations of our headquarters building and related parking facility and other amounts needed to reconcile our reportable segments to our consolidated financial statements.

Accounting Policies - The accounting policies of the segments are the same as those described in Note A.  Intersegment sales are recorded on the same basis as sales to unaffiliated customers and are discussed in further detail in Note P.  Net margin is comprised of total revenues less cost of sales and fuel.  Cost of sales and fuel includes commodity purchases, fuel, and storage and transportation costs.

Customers - In 2011, 2010 and 2009, we had no single external customer from which we received 10 percent or more of our consolidated gross revenues.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2011	ONEOK Partners (a)			Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	10,919,004		$	1,609,628	$	2,274,799	$	2,363		$	14,805,794
Intersegment revenues		403,603			11,706		502,418		(917,727	)		-
Total revenues	$	11,322,607		$	1,621,334	$	2,777,217	$	(915,364	)	$	14,805,794
Net margin	$	1,577,380		$	751,835	$	48,740	$	2,404		$	2,380,359
Operating costs		459,364			422,073		24,527		2,359			908,323
Depreciation and amortization		177,549			132,212		445		1,954			312,160
Gain (loss) on sale of assets		(963	)		-		-		-			(963	)
Operating income	$	939,504		$	197,550	$	23,768	$	(1,909	)	$	1,158,913
Equity earnings from investments	$	127,246		$	-	$	-	$	-		$	127,246
Investments in unconsolidated    affiliates	$	1,223,398		$	-	$	-	$	-		$	1,223,398
Total assets	$	8,946,676		$	3,392,475	$	562,728	$	794,756		$	13,696,635
Noncontrolling interests in    consolidated subsidiaries	$	5,112		$	-	$	-	$	1,556,047		$	1,561,159
Capital expenditures	$	1,063,383		$	242,590	$	41	$	30,053		$	1,336,067
(a) - Our ONEOK Partners segment has regulated and nonregulated operations. Our ONEOK Partners segment's regulated operations had revenues of $658.5 million, net margin of $469.0 million and operating income of $232.8 million.

Year Ended December 31, 2010	ONEOK Partners (a)		Natural Gas Distribution			Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	8,218,160	$	1,810,502		$	2,647,460	$	2,669		$	12,678,791
Intersegment revenues		457,740		6,900			653,717		(1,118,357	)		-
Total revenues	$	8,675,900	$	1,817,402		$	3,301,177	$	(1,115,688	)	$	12,678,791
Net margin	$	1,144,853	$	754,917		$	159,739	$	2,661		$	2,062,170
Operating costs		403,476		398,861			28,384		192			830,913
Depreciation and amortization		173,708		130,968			694		1,854			307,224
Gain (loss) on sale of assets		18,632		(13	)		-		-			18,619
Operating income	$	586,301	$	225,075		$	130,661	$	615		$	942,652
Equity earnings from investments	$	101,880	$	-		$	-	$	-		$	101,880
Investments in unconsolidated    affiliates	$	1,188,124	$	-		$	-	$	-		$	1,188,124
Total assets	$	7,920,100	$	3,237,890		$	651,960	$	689,225		$	12,499,175
Noncontrolling interests in    consolidated subsidiaries	$	5,176	$	-		$	-	$	1,467,042		$	1,472,218
Capital expenditures	$	352,714	$	215,608		$	488	$	13,938		$	582,748
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment's regulated operations had revenues of $612.2 million, net margin of $479.1 million and operating income of $250.9 million.

Year Ended December 31, 2009	ONEOK Partners (a)		Natural Gas Distribution		Energy Services		Other and Eliminations			Total
	(Thousands of dollars)
Sales to unaffiliated customers	$	5,998,726	$	1,832,146	$	2,971,902	$	2,979		$	10,805,753
Intersegment revenues		475,765		6,745		581,740		(1,064,250	)		-
Total revenues	$	6,474,491	$	1,838,891	$	3,553,642	$	(1,061,271	)	$	10,805,753
Net margin	$	1,119,297	$	716,028	$	159,647	$	2,979		$	1,997,951
Operating costs		411,227		384,126		35,542		65			830,960
Depreciation and amortization		164,136		122,594		540		1,653			288,923
Gain (loss) on sale of assets		2,668		486		-		1,652			4,806
Operating income	$	546,602	$	209,794	$	123,565	$	2,913		$	882,874
Equity earnings from investments	$	72,722	$	-	$	-	$	-		$	72,722
Investments in unconsolidated    affiliates	$	765,163	$	-	$	-	$	-		$	765,163
Total assets	$	7,953,259	$	3,120,704	$	930,086	$	823,634		$	12,827,683
Noncontrolling interests in    consolidated subsidiaries	$	5,603	$	-	$	-	$	1,232,665		$	1,238,268
Capital expenditures	$	615,691	$	157,508	$	105	$	17,941		$	791,245
(a) - Our ONEOK Partners segment has regulated and non-regulated operations. Our ONEOK Partners segment's regulated operations had revenues of $555.9 million, net margin of $451.0 million and operating income of $200.3 million.

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EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2011

EARNINGS PER SHARE [Abstract]

Earnings Per Share

The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

	Year Ended December 31, 2011
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	358,364		104,672	$	3.42
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		2,577
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	358,364		107,249	$	3.34

	Year Ended December 31, 2010
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	333,360		106,368	$	3.14
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		1,417
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	333,360		107,785	$	3.09

	Year Ended December 31, 2009
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	297,904		105,362	$	2.83
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		958
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	297,904		106,320	$	2.80

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EARNINGS PER SHARE

12 Months Ended

Dec. 31, 2011

EARNINGS PER SHARE [Abstract]

EARNINGS PER SHARE

K.           EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

	Year Ended December 31, 2011
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	358,364		104,672	$	3.42
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		2,577
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	358,364		107,249	$	3.34

	Year Ended December 31, 2010
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	333,360		106,368	$	3.14
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		1,417
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	333,360		107,785	$	3.09

	Year Ended December 31, 2009
	Income		Shares		Per Share Amount
	(Thousands, except per share amounts)
Basic EPS from continuing operations
Income from continuing operations attributable to ONEOK
available for common stock	$	297,904		105,362	$	2.83
Diluted EPS from continuing operations
Effect of options and other dilutive securities		-		958
Income from continuing operations attributable to ONEOK
available for common stock and common stock equivalents	$	297,904		106,320	$	2.80

There were no option shares excluded from the calculation of diluted EPS for 2011 and 2010.  There were 192,952 option shares excluded from the calculation of diluted EPS for 2009 since their inclusion would be antidilutive.