10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

________________

Form 10-K

(Mark One)
þ	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	FOR THE FISCAL YEAR ENDED DECEMBER 31, 2012
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 1-13265

______________________

CenterPoint Energy Resources Corp.

(Exact name of registrant as specified in its charter)

Delaware	76-0511406
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1111 Louisiana
Houston, Texas 77002	(713) 207-1111
(Address and zip code of principal executive offices)	(Registrant’s telephone number, including area code)

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

Title of Each Class	Name of Each Exchange On Which Registered
6.625% Senior Notes due 2037	New York Stock Exchange

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

None

CenterPoint Energy Resources Corp. meets the conditions set forth in General Instruction I(1)(a) and (b) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o  No þ

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 o  No þ

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 þ  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, 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 þ No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein and will not be contained, to the best of the 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. þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer o	Accelerated filer o	Non-accelerated filer þ	Smaller reporting company o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act).Yes o  No þ

The aggregate market value of the common equity held by non-affiliates as of June 30, 2012: None

TABLE OF CONTENTS

PART I
		Page
Item 1.	Business	1
Item 1A.	Risk Factors	11
Item 1B.	Unresolved Staff Comments	18
Item 2.	Properties	18
Item 3.	Legal Proceedings	19
Item 4.	Mine Safety Disclosures	19
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	19
Item 6.	Selected Financial Data	19
Item 7.	Management’s Narrative Analysis of Results of Operations	20
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	35
Item 8.	Financial Statements and Supplementary Data	37
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	66
Item 9A.	Controls and Procedures	66
Item 9B.	Other Information	66
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	67
Item 11.	Executive Compensation	67
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	67
Item 13.	Certain Relationships and Related Transactions, and Director Independence	67
Item 14.	Principal Accounting Fees and Services	67
PART IV
Item 15.	Exhibits and Financial Statement Schedules	68

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We meet the conditions specified in General Instruction I(1)(a) and (b) of Form 10-K and are thereby permitted to use the reduced disclosure format for wholly owned subsidiaries of reporting companies specified therein. Accordingly, we have omitted from this report the information called for by Item 10 (Directors, Executive Officers, and Corporate Governance), Item 11 (Executive Compensation), Item 12 (Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters) and Item 13 (Certain Relationships and Related Transactions, and Director Independence) of Form 10-K. In lieu of the information called for by Item 6 (Selected Financial Data) and Item 7 (Management’s Discussion and Analysis of Financial Condition and Results of Operations) of Form 10-K, we have included, under Item 7, Management’s Narrative Analysis of Results of Operations to explain the reasons for material changes in the amount of revenue and expense items between 2010, 2011 and 2012.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

From time to time we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, future events or performance and underlying assumptions and other statements that are not historical facts. These statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those expressed or implied by these statements. You can generally identify our forward-looking statements by the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “objective,” “plan,” “potential,” “predict,” “projection,” “should,” “will” or other similar words.

We have based our forward-looking statements on our management’s beliefs and assumptions based on information available to our management at the time the statements are made. We caution you that assumptions, beliefs, expectations, intentions and projections about future events may and often do vary materially from actual results. Therefore, we cannot assure you that actual results will not differ materially from those expressed or implied by our forward-looking statements.

Some of the factors that could cause actual results to differ from those expressed or implied by our forward-looking statements are described under “Risk Factors” in Item 1A and “Management’s Narrative Analysis of Results of Operations — Certain Factors Affecting Future Earnings” in Item 7 of this report, which discussions are incorporated herein by reference.

You should not place undue reliance on forward-looking statements. Each forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to update or revise any forward-looking statements.

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PART I

Item 1.  Business

OUR BUSINESS

Overview

We own and operate natural gas distribution systems in six states.  Subsidiaries of ours own interstate natural gas pipelines and gas gathering systems and provide various ancillary services.  A wholly owned subsidiary of ours offers variable and fixed-price physical natural gas supplies primarily to commercial and industrial customers and electric and gas utilities.  References to “we,” “us,” and “our” mean CenterPoint Energy Resources Corp. (CERC Corp., together with our subsidiaries, CERC).  We are an indirect wholly owned subsidiary of CenterPoint Energy, Inc. (CenterPoint Energy), a public utility holding company.

Our reportable business segments are Natural Gas Distribution, Competitive Natural Gas Sales and Services, Interstate Pipelines, Field Services and Other Operations.  From time to time, we consider the acquisition or the disposition of assets or businesses.

Our principal executive offices are located at 1111 Louisiana, Houston, Texas 77002 (telephone number: 713-207-1111).

We make available free of charge on our parent company’s Internet website our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 as soon as reasonably practicable after we electronically file such reports with, or furnish them to, the Securities and Exchange Commission (SEC).  Our parent company’s website address is www.centerpointenergy.com. Except to the extent explicitly stated herein, documents and information on our parent company’s website are not incorporated by reference herein.

Natural Gas Distribution

Our natural gas distribution business (Gas Operations) engages in regulated intrastate natural gas sales to, and natural gas transportation for, approximately 3.3 million residential, commercial and industrial customers in Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma and Texas. The largest metropolitan areas served in each state by Gas Operations are Houston, Texas; Minneapolis, Minnesota; Little Rock, Arkansas; Shreveport, Louisiana; Biloxi, Mississippi; and Lawton, Oklahoma. In 2012, approximately 37% of Gas Operations’ total throughput was to residential customers and approximately 63% was to commercial and industrial customers.

The table below reflects the number of natural gas distribution customers by state as of December 31, 2012:

	Residential	Commercial/ Industrial	Total Customers
Arkansas	384,640	48,405	433,045
Louisiana	231,566	17,191	248,757
Minnesota	747,266	68,067	815,333
Mississippi	110,245	12,587	122,832
Oklahoma	91,795	10,694	102,489
Texas	1,493,183	89,469	1,582,652
Total Gas Operations	3,058,695	246,413	3,305,108

Gas Operations also provides unregulated services in Minnesota consisting of heating, ventilating and air conditioning (HVAC) equipment and appliance repair, and sales of HVAC, hearth and water heating equipment.

The demand for intrastate natural gas sales to residential customers and natural gas sales and transportation for commercial and industrial customers is seasonal. In 2012, approximately 66% of the total throughput of Gas Operations’ business occurred in the first and fourth quarters. These patterns reflect the higher demand for natural gas for heating purposes during those periods.

Supply and Transportation.  In 2012, Gas Operations purchased virtually all of its natural gas supply pursuant to contracts with remaining terms varying from a few months to four years. Major suppliers in 2012 included BP Energy Company/BP Canada Energy Marketing (12.2% of supply volumes), Tenaska Marketing Ventures (9.6%), Cargill, Inc. (9.5%), Kinder Morgan Tejas Pipeline/

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Kinder Morgan Texas Pipeline (8.8%), Shell Energy North America (6.4%), Conoco Inc. (6.2%), Macquarie Energy (5.1%), Sequent Energy Management (4%), JP Morgan (3.8%), and Oneok Energy Services (3.3%). Numerous other suppliers provided the remaining 31.1% of Gas Operations' natural gas supply requirements. Gas Operations transports its natural gas supplies through various intrastate and interstate pipelines, including those owned by our other subsidiaries, under contracts with remaining terms, including extensions, varying from one to ten years. Gas Operations anticipates that these gas supply and transportation contracts will be renewed or replaced prior to their expiration.

Gas Operations actively engages in commodity price stabilization pursuant to annual gas supply plans presented to and/or filed with each of its state regulatory authorities. These price stabilization activities include use of storage gas and contractually establishing structured prices (e.g., fixed price, costless collars and caps) with our physical gas suppliers. Its gas supply plans generally call for 50-75% of winter supplies to be stabilized in some fashion.

Generally, the regulations of the states in which Gas Operations operates allow it to pass through changes in the cost of natural gas, including savings and costs of financial derivatives associated with the index-priced physical supply, to its customers under purchased gas adjustment provisions in its tariffs. Depending upon the jurisdiction, the purchased gas adjustment factors are updated periodically, ranging from monthly to semi-annually. The changes in the cost of gas billed to customers are subject to review by the applicable regulatory bodies.

Gas Operations uses various third-party storage services or owned natural gas storage facilities to meet peak-day requirements and to manage the daily changes in demand due to changes in weather and may also supplement contracted supplies and storage from time to time with stored liquefied natural gas and propane-air plant production.

Gas Operations owns and operates an underground natural gas storage facility with a capacity of 7.0 billion cubic feet (Bcf). It has a working capacity of 2.0 Bcf available for use during a normal heating season and a maximum daily withdrawal rate of 50 million cubic feet (MMcf). It also owns nine propane-air plants with a total production rate of 200,000 Dekatherms (DTH) per day and on-site storage facilities for 12 million gallons of propane (1.0 Bcf natural gas equivalent). It owns a liquefied natural gas plant facility with a 12 million-gallon liquefied natural gas storage tank (1.0 Bcf natural gas equivalent) and a production rate of 72,000 DTH per day.

On an ongoing basis, Gas Operations enters into contracts to provide sufficient supplies and pipeline capacity to meet its customer requirements. However, it is possible for limited service disruptions to occur from time to time due to weather conditions, transportation constraints and other events. As a result of these factors, supplies of natural gas may become unavailable from time to time, or prices may increase rapidly in response to temporary supply constraints or other factors.

Gas Operations has entered into various asset management agreements associated with its utility distribution service in Arkansas, Louisiana, Mississippi, Oklahoma and Texas.  Generally, these asset management agreements are contracts between Gas Operations and an asset manager that are intended to transfer the working capital obligation and maximize the utilization of the assets. In these agreements, Gas Operations agreed to release transportation and storage capacity to other parties to manage gas storage, supply and delivery arrangements for Gas Operations and to use the released capacity for other purposes when it is not needed for Gas Operations. Gas Operations is compensated by the asset manager through payments made over the life of the agreements based in part on the results of the asset optimization.  Gas Operations has received approval from the state regulatory commissions in Arkansas, Louisiana, Mississippi and Oklahoma to retain a share of the asset management agreement proceeds. The agreements have varying terms, the longest of which expires in 2016.

Assets

As of December 31, 2012, Gas Operations owned approximately 72,000 linear miles of natural gas distribution mains, varying in size from one-half inch to 24 inches in diameter. Generally, in each of the cities, towns and rural areas served by Gas Operations, it owns the underground gas mains and service lines, metering and regulating equipment located on customers’ premises and the district regulating equipment necessary for pressure maintenance. With a few exceptions, the measuring stations at which Gas Operations receives gas are owned, operated and maintained by others, and its distribution facilities begin at the outlet of the measuring equipment. These facilities, including odorizing equipment, are usually located on land owned by suppliers.

Competition

Gas Operations competes primarily with alternate energy sources such as electricity and other fuel sources. In some areas, intrastate pipelines, other gas distributors and marketers also compete directly for gas sales to end-users. In addition, as a result of

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federal regulations affecting interstate pipelines, natural gas marketers operating on these pipelines may be able to bypass Gas Operations’ facilities and market and sell and/or transport natural gas directly to commercial and industrial customers.

Competitive Natural Gas Sales and Services

We offer variable and fixed-priced physical natural gas supplies primarily to commercial and industrial customers and electric and gas utilities through CenterPoint Energy Services, Inc. (CES) and its subsidiary, CenterPoint Energy Intrastate Pipelines, LLC (CEIP).

In 2012, CES marketed approximately 562 Bcf of natural gas, related energy services and transportation to approximately 16,300 customers (including approximately 6 Bcf to affiliates) in 21 states. Not included in the 2012 customer count are approximately 12,700 natural gas customers that are served under residential and small commercial choice programs invoiced by their host utility. CES customers vary in size from small commercial customers to large utility companies in the central and eastern regions of the United States.

CES offers a variety of natural gas management services to gas utilities, large industrial customers, electric generators, smaller commercial and industrial customers, municipalities, educational institutions and hospitals. These services include load forecasting, supply acquisition, daily swing volume management, invoice consolidation, storage asset management, firm and interruptible transportation administration and forward price management. CES also offers a portfolio of physical delivery services and financial products designed to meet customers' supply and price risk management needs. These customers are served directly, through interconnects with various interstate and intrastate pipeline companies, and portably, through our mobile energy solutions business.

In addition to offering natural gas management services, CES procures and optimizes transportation and storage assets. CES currently transports natural gas on 47 interstate and intrastate pipelines within states located throughout the central and eastern United States. CES maintains a portfolio of natural gas supply contracts and firm transportation and storage agreements to meet the natural gas requirements of its customers. CES aggregates supply from various producing regions and offers contracts to buy natural gas with terms ranging from one month to over five years. In addition, CES actively participates in the spot natural gas markets in an effort to balance daily and monthly purchases and sales obligations. Natural gas supply and transportation capabilities are leveraged through contracts for ancillary services including physical storage and other balancing arrangements.

As described above, CES offers its customers a variety of load following services. In providing these services, CES uses its customers’ purchase commitments to forecast and arrange its own supply purchases, storage and transportation services to serve customers’ natural gas requirements. As a result of the variance between this forecast activity and the actual monthly activity, CES will either have too much supply or too little supply relative to its customers’ purchase commitments. These supply imbalances arise each month as customers’ natural gas requirements are scheduled and corresponding natural gas supplies are nominated by CES for delivery to those customers. CES’ processes and risk control environment are designed to measure and value imbalances on a real-time basis to ensure that CES’ exposure to commodity price risk is kept to a minimum. The value assigned to these imbalances is calculated daily and is known as the aggregate Value at Risk (VaR).

Our risk control policy, which is overseen by CenterPoint Energy's Risk Oversight Committee, defines authorized and prohibited trading instruments and trading limits. CES is a physical marketer of natural gas and uses a variety of tools, including pipeline and storage capacity, financial instruments and physical commodity purchase contracts to support its sales. The CES business optimizes its use of these various tools to minimize its supply costs and does not engage in proprietary or speculative commodity trading. However, up to 3 Bcf of storage gas can be sold prior to purchase or purchased prior to sale for a period not to exceed 12 months. These open positions are subject to the existing VaR limits. The VaR limits within which CES operates, a $4 million maximum, are consistent with CES' operational objective of matching its aggregate sales obligations (including the swing associated with load following services) with its supply portfolio in a manner that minimizes its total cost of supply. In 2012, CES' VaR averaged $0.2 million with a high of $1.0 million.

Assets

CEIP owns and operates approximately 233 miles of intrastate pipeline in Louisiana and Texas and contracts out approximately 2.3 Bcf of storage at its Pierce Junction facility in Texas under long-term leases. In addition, CES leases transportation capacity of approximately 0.81 Bcf per day on various interstate and intrastate pipelines and approximately 12 Bcf of storage to service its shippers and end-users.

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Competition

CES competes with regional and national wholesale and retail gas marketers including the marketing divisions of natural gas producers and utilities. In addition, CES competes with intrastate pipelines for customers and services in its market areas.

Interstate Pipelines

Our pipelines business operates interstate natural gas pipelines with gas transmission lines primarily located in Arkansas, Illinois, Louisiana, Missouri, Oklahoma and Texas. Our interstate pipeline operations are primarily conducted by two wholly owned subsidiaries that provide gas transportation and storage services primarily to industrial customers and local distribution companies:

• CenterPoint Energy Gas Transmission Company, LLC (CEGT) is an interstate pipeline that provides natural gas transportation, natural gas storage and pipeline services to customers principally in Arkansas, Louisiana, Oklahoma and Texas and includes the 1.9 Bcf per day pipeline from Carthage, Texas to Perryville, Louisiana, which CEGT operates as a separate line with a fixed fuel rate; and

• CenterPoint Energy-Mississippi River Transmission, LLC (MRT) is an interstate pipeline that provides natural gas transportation, natural gas storage and pipeline services to customers principally in Arkansas, Illinois and Missouri.

The rates charged by CEGT and MRT for interstate transportation and storage services are regulated by the Federal Energy Regulatory Commission (FERC). Our interstate pipelines business operations may be affected by changes in the demand for natural gas, the available supply and relative price of natural gas in the Mid-continent and Gulf Coast natural gas supply regions and general economic conditions.

In 2012, approximately 18% of CEGT and MRT's total operating revenue was attributable to services provided to Gas Operations, an affiliate, and approximately 9% was attributable to services provided to Laclede Gas Company (Laclede), an unaffiliated distribution company that provides natural gas utility service to the greater St. Louis metropolitan area in Illinois and Missouri. Services to Gas Operations and Laclede are provided under several long-term firm storage and transportation agreements.  The primary terms of CEGT's firm transportation and storage contracts with Gas Operations will expire in 2021. MRT's firm transportation and storage contracts with Laclede are in their evergreen period, subject to termination by either party upon one year notice.

Southeast Supply Header, LLC. CenterPoint Southeastern Pipelines Holding, LLC, our wholly owned subsidiary, owns a 50% interest in Southeast Supply Header, LLC (SESH). SESH owns a 1.0 Bcf per day, 274-mile interstate pipeline that runs from the Perryville Hub in Louisiana to Coden, Alabama. The pipeline was placed into service in the third quarter of 2008. The rates charged by SESH for interstate transportation services are regulated by the FERC. A wholly owned, indirect subsidiary of Spectra Energy Corp. owns the remaining 50% interest in SESH.

Assets

Our interstate pipelines business currently owns and operates approximately 8,000 miles of natural gas transmission lines primarily located in Arkansas, Illinois, Louisiana, Missouri, Oklahoma and Texas. Our interstate pipeline business also owns and operates 6 natural gas storage fields with a combined daily deliverability of approximately 1.3 Bcf and a combined working gas capacity of approximately 59 Bcf. Our interstate pipeline business also owns a 10% interest in the Bistineau storage facility located in Bienville Parish, Louisiana, with the remaining interest owned and operated by Gulf South Pipeline Company, LP. Our interstate pipeline business' storage capacity in the Bistineau facility is 8 Bcf of working gas with 100 MMcf per day of deliverability. Most storage operations are in north Louisiana and Oklahoma.

Competition

Our interstate pipelines business competes with other interstate and intrastate pipelines in the transportation and storage of natural gas. The principal elements of competition among pipelines are rates, terms of service, and flexibility and reliability of service. Our interstate pipelines business competes indirectly with other forms of energy, including electricity, coal and fuel oils. The primary competitive factor is price, but environmental considerations have grown in importance when consumers consider alternative forms of energy. Changes in the availability of energy and pipeline capacity, the level of business activity, conservation and governmental regulations, the capability to convert to alternative fuels, and other factors, including weather, affect the demand for natural gas in areas we serve and the level of competition for transportation and storage services.

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Field Services

Our field services business operates gas gathering, treating and processing facilities and also provides operating and technical services and remote data monitoring and communication services.

Our field services operations are conducted by a wholly owned subsidiary, CenterPoint Energy Field Services, LLC (CEFS), and subsidiaries of CEFS. Our field services business provides natural gas gathering and processing services for certain natural gas fields in the Mid-continent region of the United States that interconnect with CEGT's and MRT's pipelines, as well as other interstate and intrastate pipelines. As of the end of 2012, our field services business gathered an average of approximately 2.4 Bcf per day of natural gas. In addition, our field services business has the capacity available to treat up to 2.5 Bcf per day and process 625 MMcf per day of natural gas. CEFS, through its ServiceStar operating division, provides remote data monitoring and communications services to affiliates and third parties.

Our field services business operations may be affected by changes in the demand for natural gas and natural gas liquids (NGLs), the available supply and relative price of natural gas and NGLs in the Mid-continent and Gulf Coast natural gas supply regions and general economic conditions.

CEFS has long-term agreements with an indirect wholly owned subsidiary of Encana Corporation (Encana) and an indirect wholly owned subsidiary of Royal Dutch Shell plc (Shell) to provide gathering and treating services for their natural gas production from certain Haynesville Shale and Bossier Shale formations in Texas and Louisiana. Under the long-term agreements, Encana or Shell may elect to require CEFS to expand the capacity of its gathering systems by up to an additional 1.3 Bcf per day. CEFS estimates that the cost to expand the capacity of its gathering systems by an additional 1.3 Bcf per day would be as much as $440 million. Encana and Shell would provide incremental volume commitments in connection with an election to expand system capacity.

In May 2012, CEFS purchased the Amoruso gathering system located in east Texas and related assets from a subsidiary of Encana for approximately $89 million. In connection with this acquisition, CEFS entered into a 15-year gathering agreement with Encana to gather and treat its natural gas production from the Amoruso and Hilltop fields located in Robertson and Leon counties in east Texas. The gathering agreement includes volume commitments and an acreage dedication. As of the end of 2012, the Amoruso gathering system had nearly 200 MMcf per day of natural gas throughput primarily from the Deep Bossier and Cotton Valley Lime formations.

Waskom Gas Processing Company. Prior to July 31, 2012, CenterPoint Energy Gas Processing Company, our wholly owned, indirect subsidiary, owned a 50% general partnership interest in Waskom Gas Processing Company (Waskom), a Texas general partnership, which owns and operates a natural gas processing plant and natural gas gathering assets in east Texas. On July 31, 2012, our wholly owned indirect subsidiaries purchased the 50% interest that we did not already own in Waskom, as well as other gathering and related assets from a third-party for approximately $273 million. The Waskom plant is capable of processing approximately 320 MMcf per day of natural gas. The gathering assets owned by Waskom are capable of gathering approximately 75 MMcf per day of natural gas.

Assets

Our field services business owns and operates approximately 4,600 miles of gathering lines and processing plants that collect, treat and process natural gas primarily from three regions located in major producing fields in Arkansas, Louisiana, Oklahoma and Texas.

Competition

Our field services business competes with other companies in the natural gas gathering, treating and processing business. The principal elements of competition are rates, terms of service and reliability of services. Our field services business competes indirectly with alternative forms of energy, including electricity, coal and fuel oils. The primary competitive factor is price, but environmental considerations have grown in importance when consumers consider other forms of energy. Changes in the availability of energy and pipeline capacity, the level of business activity, conservation and governmental regulations, the capability to convert to alternative fuels, and other factors, including weather, affect the demand for natural gas in areas we serve and the level of competition for gathering, treating, and processing services. In addition, competition among forms of energy is affected by commodity pricing levels and influences the level of drilling activity and demand for our gathering operations.

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Other Operations

Our Other Operations business segment includes unallocated corporate costs and inter-segment eliminations.

Financial Information About Segments

For financial information about our segments, see Note 14 to our consolidated financial statements, which note is incorporated herein by reference.

REGULATION

We are subject to regulation by various federal, state and local governmental agencies, including the regulations described below.

Federal Energy Regulatory Commission

The FERC has jurisdiction under the Natural Gas Act and the Natural Gas Policy Act of 1978, as amended, to regulate the transportation of natural gas in interstate commerce and natural gas sales for resale in interstate commerce that are not first sales. The FERC regulates, among other things, the construction of pipeline and related facilities used in the transportation and storage of natural gas in interstate commerce, including the extension, expansion or abandonment of these facilities. The rates charged by interstate pipelines for interstate transportation and storage services are also regulated by the FERC. The FERC has authority to prohibit market manipulation in connection with FERC-regulated transactions and to impose significant civil and criminal penalties for statutory violations and violations of the FERC’s rules or orders. Our competitive natural gas sales and services subsidiary markets natural gas in interstate commerce pursuant to blanket authority granted by the FERC.

Our natural gas pipeline subsidiaries may periodically file applications with the FERC for changes in their generally available maximum rates and charges designed to allow them to recover their costs of providing service to customers (to the extent allowed by prevailing market conditions), including a reasonable rate of return. These rates are normally allowed to become effective after a suspension period and, in some cases, are subject to refund under applicable law until such time as the FERC issues an order on the allowable level of rates.

As a public utility holding company, under the Public Utility Holding Company Act of 2005, CenterPoint Energy and its subsidiaries, including us, are subject to reporting and accounting requirements and are required to maintain certain books and records and make them available for review by the FERC and state regulatory authorities in certain circumstances.

State and Local Regulation

In almost all communities in which Gas Operations provides natural gas distribution services, it operates under franchises, certificates or licenses obtained from state and local authorities. The original terms of the franchises, with various expiration dates, typically range from 10 to 30 years, although franchises in Arkansas are perpetual. Gas Operations expects to be able to renew expiring franchises. In most cases, franchises to provide natural gas utility services are not exclusive.

Substantially all of Gas Operations is subject to cost-of-service rate regulation by the relevant state public utility commissions and, in Texas, by the Railroad Commission of Texas and those municipalities served by Gas Operations that have retained original jurisdiction. In certain of its jurisdictions, Gas Operations has in effect annual rate adjustment mechanisms that provide for changes in rates dependent upon certain changes in invested capital, earned returns on equity or actual margins realized.

Rate Proceedings. For a discussion of Gas Operations' ongoing rate proceedings, see “Management's Narrative Analysis of Results of Operations — Liquidity and Capital Resources — Regulatory Matters” in Item 7 of this report, which discussion is incorporated herein by reference.

Department of Transportation

In December 2006, Congress enacted the Pipeline Inspection, Protection, Enforcement and Safety Act of 2006 (2006 Act), which reauthorized the programs adopted under the Pipeline Safety Improvement Act of 2002 (2002 Act).  These programs included several requirements related to ensuring pipeline safety, and a requirement to assess the integrity of pipeline transmission facilities in areas of high population concentration. Under the 2002 Act, remediation activities are to be performed over a 10-year period. Our pipeline subsidiaries met this initial time frame for completion of the base line assessments and are currently performing reassessments as required.

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Pursuant to the 2006 Act, the Pipeline and Hazardous Materials Safety Administration (PHMSA) at the Department of Transportation (DOT) issued regulations, effective February 12, 2010, requiring operators of gas distribution pipelines to develop and implement integrity management programs similar to those required for gas transmission pipelines, but tailored to reflect the differences in distribution pipelines.  Operators of natural gas distribution systems were required to write and implement their integrity management programs by August 2, 2011.  Our pipeline subsidiaries met this deadline.

Pursuant to the 2002 Act and the 2006 Act, PHMSA has adopted a number of rules concerning, among other things, distinguishing between gathering lines and transmission facilities, requiring certain design and construction features in new and replaced lines to reduce corrosion and requiring pipeline operators to amend existing written operations and maintenance procedures and operator qualification programs.  PHMSA also updated its reporting requirements for natural gas pipelines effective January 1, 2011.

In December 2011, Congress passed the Pipeline Safety, Regulatory Certainty, and Job Creation Act of 2011 (2011 Act). This act increases the maximum civil penalties for pipeline safety administrative enforcement actions; requires the DOT to study and report on the expansion of integrity management requirements and the sufficiency of existing gathering line regulations to ensure safety; requires pipeline operators to verify their records on maximum allowable operating pressure; and imposes new emergency response and incident notification requirements.

We anticipate that compliance with PHMSA's regulations, performance of the remediation activities by our interstate and intrastate pipelines and natural gas distribution companies and verification of records on maximum allowable operating pressure will require increases in both capital expenditures and operating costs. The level of expenditures will depend upon several factors, including age, location and operating pressures of the facilities. In particular, the cost of compliance with DOT's integrity management rules will depend on integrity testing and the repairs found to be necessary by such testing. Changes to the amount of pipe subject to integrity management, whether by expansion of the definition of the type of areas subject to integrity management procedures or of the applicability of such procedures outside of those defined areas, may also affect the costs we incur. Implementation of the 2011 Act by PHMSA may result in other regulations or the reinterpretation of existing regulations that could impact our compliance costs. In addition, we may be subject to DOT's enforcement actions and penalties for failure to comply with pipeline regulations.

ENVIRONMENTAL MATTERS

Our operations are subject to stringent and complex laws and regulations pertaining to health, safety and the environment. As an owner or operator of natural gas pipelines and distribution systems and gas gathering and processing systems, we must comply with these laws and regulations at the federal, state and local levels. These laws and regulations can restrict or impact our business activities in many ways, such as:

• restricting the way we can handle or dispose of wastes;

• limiting or prohibiting construction activities in sensitive areas such as wetlands, coastal regions or areas inhabited by endangered species;

• requiring remedial action to mitigate environmental conditions caused by our operations or attributable to former operations;

• enjoining the operations of facilities deemed in non-compliance with permits issued pursuant to such environmental laws and regulations; and

• impacting the demand for our services by directly or indirectly affecting the use or price of natural gas, or the ability to extract natural gas in areas we serve in our interstate pipelines and field services businesses.

In order to comply with these requirements, we may need to spend substantial amounts and devote other resources from time to time to:

• construct or acquire new equipment;

• acquire permits for facility operations;

• modify, upgrade or replace existing and proposed equipment; and

• clean up or decommission waste disposal areas, fuel storage and management facilities and other locations and facilities.

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Failure to comply with these laws and regulations may trigger a variety of administrative, civil and criminal enforcement measures, including the assessment of monetary penalties, the imposition of remedial actions and the issuance of orders enjoining future operations. Certain environmental statutes impose strict, joint and several liability for costs required to clean up and restore sites where hazardous substances have been disposed or otherwise released. Moreover, it is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by the release of hazardous substances or other waste products into the environment.

The recent trend in environmental regulation has been to place more restrictions and limitations on activities that may affect the environment, and thus there can be no assurance as to the amount or timing of future expenditures for environmental compliance or remediation, and actual future expenditures may be different from the amounts we currently anticipate. We try to anticipate future regulatory requirements that might be imposed and plan accordingly to remain in compliance with changing environmental laws and regulations and to ensure the costs of such compliance are reasonable.

Based on current regulatory requirements and interpretations, we do not believe that compliance with federal, state or local environmental laws and regulations will have a material adverse effect on our business, financial position, results of operations or cash flows. In addition, we believe that our current environmental remediation activities will not materially interrupt or diminish our operational ability. We cannot assure you, however, that future events, such as changes in existing laws, the promulgation of new laws, or the development or discovery of new facts or conditions will not cause us to incur significant costs. The following is a discussion of all material current environmental and safety laws and regulations that relate to our operations. We believe that we are in substantial compliance with all of these environmental laws and regulations.

Global Climate Change

In recent years, there has been increasing public debate regarding the potential impact on global climate change by various “greenhouse gases” (GHGs) such as carbon dioxide, a byproduct of burning fossil fuels, and methane, the principal component of the natural gas that we transport and deliver to customers. The United States Congress has, from time to time, considered adopting legislation to reduce emissions of GHGs, and there has been a wide-ranging policy debate, both nationally and internationally, regarding the impact of these gases and possible means for their regulation. Some of the proposals would require industrial sources to meet stringent new standards that would require substantial reductions in carbon emissions.  In addition, efforts have been made and continue to be made in the international community toward the adoption of international treaties or protocols that would address global climate change issues, such as the United Nations Climate Change Conference in Doha, Qatar in 2012.  Following a finding by the U.S. Environmental Protection Agency (EPA) that certain GHGs represent an endangerment to human health, the EPA adopted two sets of rules regulating GHG emissions under the Clean Air Act. One requires a reduction in emissions of GHGs from motor vehicles beginning January 2, 2011.  The other regulates emissions of GHGs from certain large stationary sources under the Clean Air Act's Prevention of Significant Deterioration and Title V programs, commencing when the motor vehicle standards took effect on January 2, 2011. Also, the EPA adopted its “Mandatory Reporting of Greenhouse Gases Rule” that requires the annual calculation and reporting of GHG emissions from natural gas transmission, gathering, processing and distribution systems and electric distribution systems that emit 25,000 metric tons or more of CO₂ equivalent per year.  These additional reporting requirements began in 2012 and we are currently in compliance. These permitting and reporting requirements could lead to further regulation of GHGs by the EPA.

Although the adoption of new legislation is uncertain, action by the EPA to impose new standards and reporting requirements regarding GHG emissions continues.  As a distributor and transporter of natural gas and consumer of natural gas in our pipeline and gathering businesses, our revenues, operating costs and capital requirements could be adversely affected as a result of any regulatory action that would require installation of new control technologies or a modification of our operations or would have the effect of reducing the consumption of natural gas. Likewise, incentives to conserve energy or use energy sources other than natural gas could result in a decrease in demand for our services.  Conversely, regulatory actions that effectively promote the consumption of natural gas because of its lower emissions characteristics would be expected to beneficially affect us and our natural gas-related businesses.  At this point in time, however, it would be speculative to try to quantify the magnitude of the impacts from possible new regulatory actions related to GHG emissions, either positive or negative, on our businesses.

To the extent climate changes occur, our businesses may be adversely impacted, though we believe any such impacts are likely to occur very gradually and hence would be difficult to quantify.  To the extent global climate change results in warmer temperatures in our service territories, financial results from our natural gas distribution businesses could be adversely affected through lower gas sales, and our gas transmission and field services businesses could experience lower revenues.  Another possible effect of climate change is more frequent and more severe weather events, such as hurricanes or tornadoes.  Since many of our facilities are located along or near the Gulf Coast, increased or more severe hurricanes or tornadoes could increase our costs to repair damaged facilities

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and restore service to our customers. When we cannot deliver natural gas to customers, or our customers cannot receive our services, our financial results can be impacted by lost revenues, and we generally must seek approval from regulators to recover restoration costs.  To the extent we are unable to recover those costs, or if higher rates resulting from our recovery of such costs result in reduced demand for our services, our future financial results may be adversely impacted.

Air Emissions

Our operations are subject to the federal Clean Air Act and comparable state laws and regulations. These laws and regulations regulate emissions of air pollutants from various industrial sources, including our processing plants and compressor stations, and also impose various monitoring and reporting requirements. Such laws and regulations may require that we obtain pre-approval for the construction or modification of certain projects or facilities expected to produce air emissions or result in the increase of existing air emissions, obtain and strictly comply with air permits containing various emissions and operational limitations, or utilize specific emission control technologies to limit emissions. Our failure to comply with these requirements could subject us to monetary penalties, injunctions, conditions or restrictions on operations, and potentially criminal enforcement actions. We may be required to incur certain capital expenditures in the future for air pollution control equipment in connection with obtaining and maintaining operating permits and approvals for air emissions.

The EPA continues to adopt amendments to its regulations regarding maximum achievable control technology for stationary internal combustion engines (sometimes referred to as the RICE MACT rule), the most recent being January 14, 2013.  Compressors and back up electrical generators used by our Pipelines, Field Services and Natural Gas Distribution segments are generally compliant. Additional rules are expected to be proposed by the EPA this year for compliance by 2016 which could require capital expenditure of an additional $50 million to $75 million over the next three years.  We believe, however, that our operations will not be materially adversely affected by such requirements.

In addition, on August 16, 2012, the EPA published final rules that establish new air emission control requirements for natural gas and NGL production, processing and transportation activities, including New Source Performance Standards to address emissions of sulfur dioxide and volatile organic compounds, and National Emission Standards for Hazardous Air Pollutants (NESHAPS) to address hazardous air pollutants frequently associated with gas production and processing activities. The finalized regulations establish specific new requirements for emissions from compressors, controllers, dehydrators, storage tanks, gas processing plants and certain other equipment. The final rules under NESHAPS include maximum achievable control technology standards for “small” glycol dehydrators that are located at major sources of hazardous air pollutants and modifications to the leak detection standards for valves. Compliance with such rules is not expected to result in significant costs that would adversely impact our results of operations.

Water Discharges

Our operations are subject to the Federal Water Pollution Control Act of 1972, as amended, also known as the Clean Water Act, and analogous state laws and regulations. These laws and regulations impose detailed requirements and strict controls regarding the discharge of pollutants into waters of the United States. The unpermitted discharge of pollutants, including discharges resulting from a spill or leak incident, is prohibited. The Clean Water Act and regulations implemented thereunder also prohibit discharges of dredged and fill material in wetlands and other waters of the United States unless authorized by an appropriately issued permit. Any unpermitted release of petroleum or other pollutants from our pipelines or facilities could result in fines or penalties as well as significant remedial obligations.

Hazardous Waste

Our operations generate wastes, including some hazardous wastes, that are subject to the federal Resource Conservation and Recovery Act (RCRA), and comparable state laws, which impose detailed requirements for the handling, storage, treatment, transport and disposal of hazardous and solid waste. RCRA currently exempts many natural gas gathering and field processing wastes from classification as hazardous waste. Specifically, RCRA excludes from the definition of hazardous waste waters produced and other wastes associated with the exploration, development or production of crude oil and natural gas. However, these oil and gas exploration and production wastes are still regulated under state law and the less stringent non-hazardous waste requirements of RCRA. Moreover, ordinary industrial wastes such as paint wastes, waste solvents, laboratory wastes and waste compressor oils may be regulated as hazardous waste. The transportation of natural gas in pipelines may also generate some hazardous wastes that would be subject to RCRA or comparable state law requirements.

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Liability for Remediation

The Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended (CERCLA), also known as “Superfund,” and comparable state laws impose liability, without regard to fault or the legality of the original conduct, on certain classes of persons responsible for the release of hazardous substances into the environment. Such classes of persons include the current and past owners or operators of sites where a hazardous substance was released and companies that disposed or arranged for the disposal of hazardous substances at offsite locations such as landfills. Although petroleum, as well as natural gas, is excluded from CERCLA’s definition of a “hazardous substance,” in the course of our ordinary operations we generate wastes that may fall within the definition of a “hazardous substance.” CERCLA authorizes the EPA and, in some cases, third parties to take action in response to threats to the public health or the environment and to seek to recover from the responsible classes of persons the costs they incur. Under CERCLA, we could be subject to joint and several liability for the costs of cleaning up and restoring sites where hazardous substances have been released, for damages to natural resources, and for the costs of certain health studies.

Liability for Preexisting Conditions

Manufactured Gas Plant Sites. We and our predecessors operated manufactured gas plants (MGPs) in the past. In Minnesota, we have completed remediation on two sites, other than ongoing monitoring and water treatment. There are five remaining sites in our Minnesota service territory. We believe that we have no liability with respect to two of these sites.

As of December 31, 2012, we had recorded a liability of $14 million for remediation of these Minnesota sites. The estimated range of possible remediation costs for the sites we believe we have responsibility for was $6 million to $41 million based on remediation continuing for 30 to 50 years. The cost estimates are based on studies of a site or industry average costs for remediation of sites of similar size. The actual remediation costs will be dependent upon the number of sites to be remediated, the participation of other potentially responsible parties (PRPs), if any, and the remediation methods used. The Minnesota Public Utilities Commission includes approximately $285,000 annually in rates to fund normal on-going remediation costs.  As of December 31, 2012, we had collected $5.8 million from insurance companies to be used for future environmental remediation.

In addition to the Minnesota sites, the EPA and other regulators have investigated MGP sites that were owned or operated by us or may have been owned by one of our former affiliates. We do not expect the ultimate outcome of these investigations will have a material adverse impact on our financial condition, results of operations or cash flows.

Asbestos.  Some facilities owned by our predecessors contain or have contained asbestos insulation and other asbestos-containing materials. We or our predecessor companies have been named, along with numerous others, as a defendant in lawsuits filed by a number of individuals who claim injury due to exposure to asbestos. Some of the claimants have worked at locations owned by us, but most existing claims relate to facilities previously owned by our subsidiaries. We anticipate that additional claims like those received may be asserted in the future.  Although their ultimate outcome cannot be predicted at this time, we intend to continue vigorously contesting claims that we do not consider to have merit and do not expect, based on our experience to date, these matters, either individually or in the aggregate, to have a material adverse effect on our financial condition, results of operations or cash flows.

Other Environmental. From time to time we identify the presence of environmental contaminants on property where we conduct or have conducted operations. Other such sites involving contaminants may be identified in the future.  We have remediated and expect to continue to remediate identified sites consistent with our legal obligations. From time to time we have received notices from regulatory authorities or others regarding our status as a PRP in connection with sites found to require remediation due to the presence of environmental contaminants. In addition, we have been named from time to time as a defendant in litigation related to such sites. Although the ultimate outcome of such matters cannot be predicted at this time, we do not expect, based on our experience to date, these matters, either individually or in the aggregate, to have a material adverse effect on our financial condition, results of operations or cash flows.

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EMPLOYEES

As of December 31, 2012, we had 4,842 full-time employees. The following table sets forth the number of our employees by business segment:

Business Segment	Number	Number Represented by Unions or Other Collective Bargaining Groups
Natural Gas Distribution	3,610	1,333
Competitive Natural Gas Sales and Services	148	—
Interstate Pipelines	747	—
Field Services	337	—
Total	4,842	1,333

As of December 31, 2012, approximately 28% of our employees were covered by collective bargaining agreements. 

Item 1A. Risk Factors

The following, along with any additional legal proceedings identified or incorporated by reference in Item 3 of this report, summarizes the principal risk factors associated with our business.

Risk Factors Affecting Our Businesses

Rate regulation of our business may delay or deny our ability to earn a reasonable return and fully recover our costs.

Our rates for Gas Operations are regulated by certain municipalities and state commissions, and for our interstate pipelines by the FERC, based on an analysis of our invested capital and our expenses in a test year. Thus, the rates that we are allowed to charge may not match our expenses at any given time. The regulatory process in which rates are determined may not always result in rates that will produce full recovery of our costs and enable us to earn a reasonable return on our invested capital.

Our businesses must compete with alternate energy sources, which could result in our marketing less natural gas, and our interstate pipelines and field services businesses must compete directly with others in the transportation, storage, gathering, treating and processing of natural gas, which could lead to lower prices and reduced volumes, either of which could have an adverse impact on our results of operations, financial condition and cash flows.

We compete primarily with alternate energy sources such as electricity and other fuel sources. In some areas, intrastate pipelines, other natural gas distributors and marketers also compete directly with us for natural gas sales to end-users. In addition, as a result of federal regulatory changes affecting interstate pipelines, natural gas marketers operating on these pipelines may be able to bypass our facilities and market, sell and/or transport natural gas directly to commercial and industrial customers. Any reduction in the amount of natural gas marketed, sold or transported by us as a result of competition may have an adverse impact on our results of operations, financial condition and cash flows.

Our two interstate pipelines and our gathering systems compete with other interstate and intrastate pipelines and gathering systems in the transportation and storage of natural gas. The principal elements of competition are rates, terms of service, and flexibility and reliability of service. We also compete indirectly with other forms of energy, including electricity, coal and fuel oils. The primary competitive factor is price, but recently, environmental considerations have grown in importance when consumers consider alternative forms of energy. Excess pipeline capacity in the regions served by our interstate pipelines could also increase competition and adversely impact our ability to re-contract its available capacity when contracts expire.The actions of our competitors could lead to lower prices, which may have an adverse impact on our results of operations, financial condition and cash flows. Additionally, any reduction in the volume of natural gas transported or stored may have an adverse impact on our results of operations, financial condition and cash flows.

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Our natural gas distribution and competitive natural gas sales and services businesses are subject to fluctuations in notional natural gas prices as well as geographic and seasonal natural gas price differentials, which could affect the ability of our suppliers and customers to meet their obligations or otherwise adversely affect our liquidity and results of operations and financial condition.

We are subject to risk associated with changes in the notional price of natural gas as well as geographic and seasonal natural gas price differentials. Increases in natural gas prices might affect our ability to collect balances due from our customers and, for Gas Operations, could create the potential for uncollectible accounts expense to exceed the recoverable levels built into our tariff rates. In addition, a sustained period of high natural gas prices could (i) apply downward demand pressure on natural gas consumption in the areas in which we operate, thereby resulting in decreased sales and transportation volumes and revenues and (ii) increase the risk that our suppliers or customers fail or are unable to meet their obligations. An increase in natural gas prices would also increase our working capital requirements by increasing the investment that must be made in order to maintain natural gas inventory levels.  Additionally, a decrease in natural gas prices could increase the amount of collateral that we must provide under our hedging arrangements. Changes in geographic and seasonal natural gas price differentials affect the value of our transportation and storage services and our ability to re-contract our available capacity when contracts expire.

A decline in our credit rating could result in our having to provide collateral under our shipping or hedging arrangements or in order to purchase natural gas.

If our credit rating were to decline, we might be required to post cash collateral under our shipping or hedging arrangements or in order to purchase natural gas. If a credit rating downgrade and the resultant cash collateral requirement were to occur at a time when we were experiencing significant working capital requirements or otherwise lacked liquidity, our results of operations, financial condition and cash flows could be adversely affected.

The revenues and results of operations of our interstate pipelines and field services businesses are subject to fluctuations in the supply and price of natural gas and natural gas liquids and regulatory and other issues impacting our customers’ production decisions.

Our interstate pipelines and field services businesses largely rely on natural gas sourced in the various supply basins located in the Mid-continent region of the United States. The level of drilling and production activity in these regions is dependent on economic and business factors beyond our control. The primary factor affecting both the level of drilling activity and production volumes is natural gas pricing. A sustained decline in natural gas prices could result in a decrease in exploration and development activities in the regions served by our gathering and pipeline transportation systems and our natural gas treating and processing activities. A sustained decline could also lead producers to shut in production from their existing wells. Other factors that impact production decisions include the level of production costs relative to other available production, producers’ access to needed capital and the cost of that capital, access to drilling rigs, the ability of producers to obtain necessary drilling and other governmental permits and regulatory changes. Regulatory changes include the potential for more restrictive rules governing the use of hydraulic fracturing, a process used in the extraction of natural gas from shale reservoir formations, and the use of water in that process. Because of these factors, even if new natural gas reserves are discovered in areas served by our assets, producers may choose not to develop those reserves or to shut in production from existing reserves. To the extent the availability of this supply is substantially reduced, it could have an adverse effect on our results of operations, financial condition and cash flows.

Our revenues from these businesses are also affected by the prices of natural gas and natural gas liquids (NGLs). Although the gathering revenues from our field services operations are primarily fee-based, a small portion of these revenues is related to sales of natural gas that we retain from either a usage component of our contracts or from compressor efficiencies, and a reduction in natural gas prices could adversely impact these revenues. NGL prices generally fluctuate on a basis that correlates to fluctuations in crude oil prices. In the past, the prices of natural gas and crude oil have been extremely volatile, and we expect this volatility to continue. The markets and prices for natural gas, NGLs and crude oil depend upon factors beyond our control. These factors include supply of and demand for these commodities, which fluctuate with changes in market and economic conditions and other factors.

Our revenues and results of operations are seasonal.

A substantial portion of our revenues is derived from natural gas sales and transportation. Thus, our revenues and results of operations are subject to seasonality, weather conditions and other changes in natural gas usage, with revenues being higher during the winter months.

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The actual cost of pipelines and gathering systems under construction, future pipeline, gathering and treating systems and related compression facilities may be significantly higher than we anticipate.

Our subsidiaries have been recently involved in significant pipeline and gathering construction projects and, depending on available opportunities, may, from time to time, be involved in additional significant pipeline construction and gathering and treating system projects in the future. The construction of new pipelines, gathering and treating systems and related compression facilities may require the expenditure of significant amounts of capital, which may exceed our estimates. These projects may not be completed at the planned cost, on schedule or at all. The construction of new pipeline, gathering, treating or compression facilities is subject to construction cost overruns due to labor costs, costs of equipment and materials such as steel and nickel, labor shortages or delays, weather delays, inflation or other factors, which could be material. In addition, the construction of these facilities is typically subject to the receipt of approvals and permits from various regulatory agencies. Those agencies may not approve the projects in a timely manner or may impose restrictions or conditions on the projects that could potentially prevent a project from proceeding, lengthen its expected completion schedule and/or increase its anticipated cost. As a result, there is the risk that the new facilities may not be able to achieve our expected investment return, which could adversely affect our financial condition, results of operations or cash flows.

The states in which we provide regulated local gas distribution may, either through legislation or rules, adopt restrictions regarding organization, financing and affiliate transactions that could have significant adverse impacts on our ability to operate.

The Public Utility Holding Company Act of 1935, to which we and our subsidiaries were subject prior to its repeal in 2005, provided a comprehensive regulatory structure governing the organization, capital structure, intracompany relationships and lines of business that could be pursued by registered holding companies and their member companies. Following repeal of that act, proposals have been put forth in some of the states in which we do business that have sought to expand the state regulatory frameworks to give state regulatory authorities increased jurisdiction and scrutiny over similar aspects of the utilities that operate in those states. Some of these frameworks attempt to regulate financing activities, acquisitions and divestitures, and arrangements between the utilities and their affiliates, and to restrict the level of non-utility business that can be conducted within the holding company structure. Additionally, they may impose record keeping, record access, employee training and reporting requirements related to affiliate transactions and reporting in the event of certain downgrading of the utility’s credit rating.

These regulatory frameworks could have adverse effects on our ability to conduct our utility operations, to finance our business and to provide cost-effective utility service. In addition, if more than one state adopts restrictions on similar activities, it may be difficult for us to comply with competing regulatory requirements.

Risk Factors Associated with Our Consolidated Financial Condition

If we are unable to arrange future financings on acceptable terms, our ability to refinance existing indebtedness could be limited.

As of December 31, 2012, we had $2.7 billion of outstanding indebtedness on a consolidated basis. As of December 31, 2012, approximately $563 million of this debt is required to be paid through 2015. This amount excludes approximately $779 million borrowed from the money pool.  Our future financing activities may be significantly affected by, among other things:

• general economic and capital market conditions;

• credit availability from financial institutions and other lenders;

• investor confidence in us and CenterPoint Energy and the markets in which we operate;

• maintenance of acceptable credit ratings by us and CenterPoint Energy;

• market expectations regarding our and CenterPoint Energy's future earnings and cash flows;

• market perceptions of our and CenterPoint Energy's ability to access capital markets on reasonable terms;

• our exposure to GenOn Energy, Inc. (GenOn) (formerly known as RRI Energy, Inc., Reliant Energy, Inc. and Reliant Resources, Inc.(RRI)), a wholly owned subsidiary of NRG Energy, Inc. (NRG) in connection with its indemnification obligations arising in connection with its separation from CenterPoint Energy;

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• incremental collateral that may be required due to regulation of derivatives; and

• provisions of relevant tax and securities laws.

Our current credit ratings are discussed in “Management’s Narrative Analysis of Results of Operations— Liquidity and Capital Resources — Impact on Liquidity of a Downgrade in Credit Ratings” in Item 7 of this report. These credit ratings may not remain in effect for any given period of time and one or more of these ratings may be lowered or withdrawn entirely by a rating agency. We note that these credit ratings are not recommendations to buy, sell or hold our securities. Each rating should be evaluated independently of any other rating. Any future reduction or withdrawal of one or more of our credit ratings could have a material adverse impact on our ability to access capital on acceptable terms.

The creditworthiness and liquidity of our parent company and our affiliates could affect our creditworthiness and liquidity.

Our credit ratings and liquidity may be impacted by the creditworthiness and liquidity of our parent company and our affiliates.  As of December 31, 2012, CenterPoint Energy and its subsidiaries other than us had approximately $870 million principal amount of debt required to be paid through 2015.  This amount excludes principal repayments of approximately $1.2 billion on transition and system restoration bonds, for which dedicated revenue streams exist, and indexed debt securities obligations. If CenterPoint Energy were to experience a deterioration in its creditworthiness or liquidity, our creditworthiness and liquidity could be adversely affected. In addition, from time to time we and other affiliates invest or borrow funds in the money pool maintained by CenterPoint Energy. If CenterPoint Energy or the affiliates that borrow any funds that we might invest from time to time in the money pool were to experience a deterioration in their creditworthiness or liquidity, our creditworthiness, liquidity and the repayment of notes receivable from CenterPoint Energy and our affiliates participating in the money pool could be adversely impacted.

We are an indirect wholly owned subsidiary of CenterPoint Energy. CenterPoint Energy can exercise substantial control over our dividend policy and business and operations and could do so in a manner that is adverse to our interests.

We are managed by officers and employees of CenterPoint Energy. Our management will make determinations with respect to the following:

• our payment of dividends;

• our financings and our capital raising activities;

• mergers or other business combinations; and

• our acquisition or disposition of assets.

Other than the financial covenants contained in our credit facility (described under “Liquidity and Capital Resources” in Item 7 of this report), which could have the practical effect of limiting the payment of dividends under certain circumstances, there are no contractual restrictions on our ability to pay dividends to CenterPoint Energy.  Our management could decide to increase our dividends to CenterPoint Energy to support its cash needs. This could adversely affect our liquidity. However, under our credit facility, our ability to pay dividends is restricted by a covenant that debt as a percentage of total capitalization may not exceed 65%.

The use of derivative contracts by us and our subsidiaries in the normal course of business could result in financial losses that could negatively impact our results of operations and those of our subsidiaries.

We and our subsidiaries use derivative instruments, such as swaps, options, futures and forwards, to manage our commodity, weather and financial market risks. We and our subsidiaries could recognize financial losses as a result of volatility in the market values of these contracts, or should a counterparty fail to perform. In the absence of actively quoted market prices and pricing information from external sources, the valuation of these financial instruments can involve management’s judgment or use of estimates. As a result, changes in the underlying assumptions or use of alternative valuation methods could affect the reported fair value of these contracts.

We derive a substantial portion of our operating income from subsidiaries through which we hold a substantial portion of our assets.

We derive a substantial portion of our operating income from, and hold a substantial portion of our assets through, our subsidiaries. As a result, we depend on distributions from our subsidiaries in order to meet our payment obligations. In general, these subsidiaries

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are separate and distinct legal entities and have no obligation to provide us with funds for our payment obligations, whether by dividends, distributions, loans or otherwise. In addition, provisions of applicable law, such as those limiting the legal sources of dividends, limit our subsidiaries’ ability to make payments or other distributions to us, and our subsidiaries could agree to contractual restrictions on their ability to make distributions.

Our right to receive any assets of any subsidiary, and therefore the right of our creditors to participate in those assets, will be effectively subordinated to the claims of that subsidiary’s creditors, including trade creditors. In addition, even if we were a creditor of any subsidiary, our rights as a creditor would be subordinated to any security interest in the assets of that subsidiary and any indebtedness of the subsidiary senior to that held by us.

Other Risks

We are subject to operational and financial risks and liabilities arising from environmental laws and regulations.

Our operations are subject to stringent and complex laws and regulations pertaining to health, safety and the environment. As an owner or operator of natural gas pipelines and distribution systems, and gas gathering and processing systems, we must comply with these laws and regulations at the federal, state and local levels. These laws and regulations can restrict or impact our business activities in many ways, such as:

• restricting the way we can handle or dispose of wastes;

• limiting or prohibiting construction activities in sensitive areas such as wetlands, coastal regions, or areas inhabited by endangered species;

• requiring remedial action to mitigate environmental conditions caused by our operations, or attributable to former operations;

• enjoining the operations of facilities deemed in non-compliance with permits issued pursuant to such environmental laws and regulations; and

• impacting the demand for our services by directly or indirectly affecting the use or price of natural gas, or the ability to extract natural gas in areas we serve in our interstate pipelines and field services businesses.

In order to comply with these requirements, we may need to spend substantial amounts and devote other resources from time to time to:

• construct or acquire new equipment;

• acquire permits for facility operations;

• modify or replace existing and proposed equipment; and

• clean up or decommission waste disposal areas, fuel storage and management facilities and other locations and facilities.

Failure to comply with these laws and regulations may trigger a variety of administrative, civil and criminal enforcement measures, including the assessment of monetary penalties, the imposition of remedial actions, and the issuance of orders enjoining future operations. Certain environmental statutes impose strict, joint and several liability for costs required to clean up and restore sites where hazardous substances have been disposed or otherwise released. Moreover, it is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by the release of hazardous substances or other waste products into the environment.

The recent trend in environmental regulation has been to place more restrictions and limitations on activities that may affect the environment, and thus there can be no assurance as to the amount or timing of future expenditures for environmental compliance or remediation, and actual future expenditures may be greater than the amounts we currently anticipate.

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Our insurance coverage may not be sufficient. Insufficient insurance coverage and increased insurance costs could adversely impact our results of operations, financial condition and cash flows.

We currently have general liability and property insurance in place to cover certain of our facilities in amounts that we consider appropriate. Such policies are subject to certain limits and deductibles and do not include business interruption coverage. Insurance coverage may not be available in the future at current costs or on commercially reasonable terms, and the insurance proceeds received for any loss of, or any damage to, any of our facilities may not be sufficient to restore the loss or damage without negative impact on our results of operations, financial condition and cash flows.

We and CenterPoint Energy could incur liabilities associated with businessesand assets that we have transferred to others.

Under some circumstances, we and CenterPoint Energy could incur liabilities associated with assets and businesses we and CenterPoint Energy no longer own.  These assets and businesses were previously owned by Reliant Energy, Incorporated (Reliant Energy), a predecessor of CenterPoint Energy, directly or through subsidiaries, including us in some cases.  Through a series of transactions, the assets and businesses were transferred to a predecessor of RRI.

In connection with the organization and capitalization of RRI (now GenOn), that company and its subsidiaries assumed liabilities associated with various assets and businesses Reliant Energy transferred to them. RRI also agreed to indemnify, and cause the applicable transferee subsidiaries to indemnify, CenterPoint Energy and its subsidiaries, including us, with respect to liabilities associated with the transferred assets and businesses. These indemnity provisions were intended to place sole financial responsibility on RRI and its subsidiaries for all liabilities associated with the current and historical businesses and operations of RRI, regardless of the time those liabilities arose. If RRI (now GenOn) were unable to satisfy a liability that has been so assumed in circumstances in which Reliant Energy and its subsidiaries were not released from the liability in connection with the transfer, we and CenterPoint Energy could be responsible for satisfying the liability.

Prior to the distribution of CenterPoint Energy's ownership in RRI to its shareholders, we had guaranteed certain contractual obligations of what became RRI’s trading subsidiary.  When the companies separated, RRI agreed to secure us against obligations under the guaranties RRI had been unable to extinguish by the time of separation.  Pursuant to such agreement, as amended in December 2007, RRI (now GenOn) agreed to provide to us cash or letters of credit as security against our obligations under our remaining guaranties for demand charges under certain gas transportation agreements if and to the extent changes in market conditions expose us to a risk of loss on those guaranties based on an annual calculation, with any required collateral to be posted each December.  The undiscounted maximum potential payout of the demand charges under these transportation contracts, which will be in effect until 2018, was approximately $73 million as of December 31, 2012.  Based on market conditions in the fourth quarter of 2012 at the time the most recent annual calculation was made under the agreement, GenOn was not obligated to post any security. As a result, CenterPoint Energy returned to GenOn in the fourth quarter of 2012 the approximately $28 million of aggregate collateral previously posted by GenOn under the agreement. If GenOn should fail to perform the contractual obligations, we could have to honor our guarantee and, in such event, any collateral then provided as security may be insufficient to satisfy our obligations.

GenOn’s unsecured debt ratings are currently below investment grade. If GenOn were unable to meet its obligations, it could consider, among various options, restructuring under the bankruptcy laws, in which event GenOn might not honor its indemnification obligations and claims by GenOn’s creditors might be made against CenterPoint Energy as its former owner.

Reliant Energy and RRI (GenOn’s predecessor) are named as defendants in a number of lawsuits arising out of sales of natural gas in California and other markets. Although these matters relate to the business and operations of GenOn, claims against Reliant Energy have been made on grounds that include liability of Reliant Energy as a controlling shareholder of GenOn’s predecessor. We and CenterPoint Energy could incur liability if claims in one or more of these lawsuits were successfully asserted against us and CenterPoint Energy and indemnification from GenOn were determined to be unavailable or if GenOn were unable to satisfy indemnification obligations owed with respect to those claims.

Cyber-attacks, acts of terrorism or other disruptions could adversely impact our results of operations, financial condition and cash flows.

We are subject to cyber-security risks related to breaches in the systems and technology that we use (i) to manage our operations and other business processes and (ii) to protect sensitive information maintained in the normal course of our businesses. The distribution of natural gas to our customers and the gathering, processing and transportation of natural gas from our gathering, processing and pipeline facilities, are dependent on communications among our facilities and with third-party systems that may be delivering natural gas into or receiving natural gas and other products from our facilities. Disruption of those communications, whether caused by physical disruption such as storms or other natural phenomena, by failure of equipment or

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technology, or by manmade events, such as cyber-attacks or acts of terrorism, may disrupt our ability to deliver gas and control these assets. Cyber-attacks could also result in the loss of confidential or proprietary data or security breaches of other information technology systems that could disrupt our operations and critical business functions, adversely affect our reputation, and subject us to possible legal claims and liability, any of which could have a material adverse affect on our results of operations, financial condition and cash flows. In addition, our gas distribution and pipeline systems may be targets of terrorist activities that could disrupt our ability to conduct our business and have a material adverse affect on our results of operations, financial condition and cash flows.

Our results of operations, financial condition and cash flows may be adversely affected if we are unable to successfully operate our facilities or perform certain corporate functions.

Our performance depends on the successful operation of our facilities. Operating these facilities involves many risks, including:

• operator error or failure of equipment or processes;

• operating limitations that may be imposed by environmental or other regulatory requirements;

• labor disputes;

• information technology system failures; and

• catastrophic events such as fires, earthquakes, explosions, floods, droughts, hurricanes, pandemic health events, or other similar occurrences.

Such events may result in a decrease or elimination of revenue from our facilities, an increase in the cost of operating our facilities or delays in cash collections, any of which could have a material adverse effect on our results of operations, financial condition and/or cash flows.

Our merger and acquisition activities may not be successful or may result in completed acquisitions that do not perform as anticipated.

From time to time, we have made and may continue to make acquisitions of businesses and assets. However, suitable acquisition candidates may not continue to be available on terms and conditions we find acceptable. In addition, any completed or future acquisitions involve substantial risks, including the following:

•acquired businesses or assets may not produce revenues, earnings or cash flow at anticipated levels;

• acquired businesses or assets could have environmental, permitting or other problems for which contractual protections prove inadequate;

• we may assume liabilities that were not disclosed to us, that exceed our estimates, or for which our rights to indemnification from the seller are limited;

• we may be unable to integrate acquired businesses successfully and realize anticipated economic, operational and other benefits in a timely manner, which could result in substantial costs and delays or other operational, technical or financial problems; and

• acquisitions, or the pursuit of acquisitions, could disrupt our ongoing businesses, distract management, divert resources and make it difficult to maintain our current business standards, controls and procedures.    

Failure to attract and retain an appropriately qualified workforce could adversely impact our results of operations.

Our business is dependent on our ability to recruit, retain, and motivate employees. Certain circumstances, such as an aging workforce without appropriate replacements, a mismatch of existing skillsets to future needs, or the unavailability of contract resources may lead to operating challenges such as a lack of resources, loss of knowledge or a lengthy time period associated with skill development. Our costs, including costs for contractors to replace employees, productivity costs and safety costs, may rise. Failure to hire and adequately train replacement employees, including the transfer of significant internal historical knowledge and expertise to the new employees, or the future availability and cost of contract labor may adversely affect the ability to manage and operate our

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business. If we are unable to successfully attract and retain an appropriately qualified workforce, our results of operations could be negatively affected.

The unsettled conditions in the global financial system may have impacts on our business, liquidity and financial condition that we currently cannot predict.

The continued unsettled conditions in the global financial system may have an impact on our business, liquidity and financial condition. Our ability to access the capital markets may be severely restricted at a time when we would like, or need, to access those markets, which could have an impact on our liquidity and flexibility to react to changing economic and business conditions. In addition, the cost of debt financing and the proceeds of equity financing may be materially adversely impacted by these market conditions. Defaults of lenders in our credit facilities, should they occur, could adversely affect our liquidity.

In addition to the credit and financial market issues, a recurrence of national and local recessionary conditions may impact our business in a variety of ways. These include, among other things, reduced customer usage, increased customer default rates and wide swings in commodity prices.

Climate change legislation and regulatory initiatives could result in increased operating costs and reduced demand for our services.

The United States Congress has from time to time considered adopting legislation to reduce emissions of GHGs, and there has been a wide-ranging policy debate, both nationally and internationally, regarding the impact of these gases and possible means for their regulation.  In addition, efforts have been made and continue to be made in the international community toward the adoption of international treaties or protocols that would address global climate change issues, such as the United Nations Climate Change Conference in Doha, Qatar in 2012. Following a finding by the EPA that certain GHGs represent an endangerment to human health, the EPA adopted two sets of rules regulating GHG emissions under the Clean Air Act, one that requires a reduction in emissions of GHGs from motor vehicles and another that regulates emissions of GHGs from certain large stationary sources. In addition, the EPA expanded its existing GHG emissions reporting requirements to include upstream petroleum and natural gas systems that emit 25,000 metric tons of CO₂ equivalent per year. These permitting and reporting requirements could lead to further regulation of GHGs by the EPA.  As a distributor and transporter of natural gas and consumer of natural gas in our pipeline and gathering businesses, our revenues, operating costs and capital requirements could be adversely affected as a result of any regulatory action that would require installation of new control technologies or a modification of our operations or would have the effect of reducing the consumption of natural gas. Likewise, incentives to conserve energy or use energy sources other than natural gas could result in a decrease in demand for our services.

Climate changes could result in more frequent and more severe weather events which could adversely affect the results of operations of our businesses.

To the extent climate changes occur, our businesses may be adversely impacted, though we believe any such impacts are likely to occur very gradually and hence would be difficult to quantify with specificity.  To the extent global climate change results in warmer temperatures in our service territories, financial results from our natural gas distribution businesses could be adversely affected through lower gas sales, and our gas transmission and field services businesses could experience lower revenues. Another possible climate change is more frequent and more severe weather events, such as hurricanes or tornadoes.  Since many of our facilities are located along or near the Gulf Coast, increased or more severe hurricanes or tornadoes could increase our costs to repair damaged facilities and restore service to our customers.  When we cannot deliver natural gas to customers or our customers cannot receive our services, our financial results can be impacted by lost revenues, and we generally must seek approval from regulators to recover restoration costs.  To the extent we are unable to recover those costs, or if higher rates resulting from our recovery of such costs result in reduced demand for our services, our future financial results may be adversely impacted.

Item 1B.  Unresolved Staff Comments

None.

Item 2.  Properties

Character of Ownership

We own our principal properties in fee. Most of our gas mains are located, pursuant to easements and other rights, on public roads or on land owned by others.

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Natural Gas Distribution

For information regarding the properties of our Natural Gas Distribution business segment, please read “Business — Our Business — Natural Gas Distribution — Assets” in Item 1 of this report, which information is incorporated herein by reference.

Competitive Natural Gas Sales and Services

For information regarding the properties of our Competitive Natural Gas Sales and Services business segment, please read “Business — Our Business — Competitive Natural Gas Sales and Services — Assets” in Item 1 of this report, which information is incorporated herein by reference.

Interstate Pipelines

For information regarding the properties of our Interstate Pipelines business segment, please read “Business — Our Business — Interstate Pipelines — Assets” in Item 1 of this report, which information is incorporated herein by reference.

Field Services

For information regarding the properties of our Field Services business segment, please read “Business — Our Business — Field Services — Assets” in Item 1 of this report, which information is incorporated herein by reference.

Item 3.  Legal Proceedings

For a discussion of material legal and regulatory proceedings affecting us, please read “Business — Regulation” and “Business — Environmental Matters” in Item 1 of this report, “Management's Narrative Analysis of Results of Operations — Liquidity and Capital Resources — Regulatory Matters” in Item 7 of this report and Note 12(e) to our consolidated financial statements, which information is incorporated herein by reference.

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

All of the 1,000 outstanding shares of CERC Corp.’s common stock are held by Utility Holding, LLC, a wholly owned subsidiary of CenterPoint Energy.

No dividends were paid to our parent in 2010, 2011 or 2012.

Our revolving credit facility limits our debt as a percentage of total capitalization to 65%.  This covenant could restrict our ability to distribute dividends.

Item 6.  Selected Financial Data

The information called for by Item 6 is omitted pursuant to Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly Owned Subsidiaries).

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Item 7.  Management’s Narrative Analysis of Results of Operations

The following narrative analysis should be read in combination with our consolidated financial statements and notes contained in Item 8 of this report.

Background

We own and operate natural gas distribution systems in six states. Our subsidiaries own interstate natural gas pipelines and gas gathering systems and provide various ancillary services. A wholly owned subsidiary of ours offers variable and fixed-price physical natural gas supplies primarily to commercial and industrial customers and electric and gas utilities. We are an indirect wholly owned subsidiary of CenterPoint Energy, Inc. (CenterPoint Energy).

Business Segments

Because we are an indirect wholly owned subsidiary of CenterPoint Energy, our determination of reportable segments considers the strategic operating units under which CenterPoint Energy manages sales, allocates resources and assesses performance of various products and services to wholesale or retail customers in differing regulatory environments. In this section, we discuss our results on a consolidated basis and individually for each of our business segments. We also discuss our liquidity, capital resources and critical accounting policies. The results of our business operations are significantly impacted by weather, customer growth, economic conditions, cost management, competition, rate proceedings before regulatory agencies and other actions of the various regulatory agencies to which we are subject. Our natural gas distribution services and interstate pipelines business segments are subject to rate regulation. A summary of our reportable business segments as of December 31, 2012 is set forth below:

Natural Gas Distribution

We own and operate our regulated natural gas distribution business (Gas Operations), which engages in intrastate natural gas sales to, and natural gas transportation for, approximately 3.3 million residential, commercial and industrial customers in Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma and Texas.

Competitive Natural Gas Sales and Services

Our operations also include non-rate regulated natural gas sales to, and transportation services for, commercial and industrial customers in 21 states in the central and eastern regions of the United States.

Interstate Pipelines

Our interstate pipelines business owns and operates approximately 8,000 miles of natural gas transmission lines primarily located in Arkansas, Illinois, Louisiana, Missouri, Oklahoma and Texas. It also owns and operates six natural gas storage fields with a combined daily deliverability of approximately 1.3 billion cubic feet (Bcf) and a combined working gas capacity of approximately 59 Bcf. It also owns a 50% interest in Southeast Supply Header, LLC (SESH). SESH owns a 1.0 Bcf per day, 274-mile interstate pipeline that runs from the Perryville Hub in Louisiana to Coden, Alabama. Most storage operations are in north Louisiana and Oklahoma.

Field Services

Our field services business owns and operates approximately 4,600 miles of gathering pipelines and processing plants that collect, treat and process natural gas primarily from three regions located in major producing fields in Arkansas, Louisiana, Oklahoma and Texas.  

Other Operations

Our other operations business segment includes unallocated corporate costs and inter-segment eliminations.

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EXECUTIVE SUMMARY

Factors Influencing Our Business

We are an energy delivery company. The majority of our revenues are generated from the gathering, processing, transportation and sale of natural gas by our subsidiaries. To assess our financial performance, our management primarily monitors operating income and cash flows from our four business segments. Within these broader financial measures, we monitor margins, operation and maintenance expense, interest expense, capital spending and working capital requirements. In addition to these financial measures we also monitor a number of variables that management considers important to the operation of our business segments, including the number of customers, throughput, use per customer, commodity prices and heating and cooling degree days. We also monitor system reliability, safety factors and customer satisfaction to gauge our performance.

To the extent adverse economic conditions affect our suppliers and customers, results from our energy delivery businesses may suffer.  Reduced demand and lower energy prices could lead to financial pressure on some of our customers who operate within the energy industry. Also, adverse economic conditions, coupled with concerns for protecting the environment, may cause consumers to use less energy or avoid expansions of their facilities, resulting in less demand for our services.

Performance of our Natural Gas Distribution business segment is significantly influenced by the number of customers and energy usage per customer. Weather conditions can have a significant impact on energy usage, and we compare our results on a weather adjusted basis. In 2012, every state in which we distribute natural gas had the warmest winter on record. In recent years, customers have typically reduced their energy consumption, and reduced consumption can adversely affect our results. However, due to more affordable energy prices and continued economic recovery in the areas we serve, the trend toward lower usage has slowed in some of the areas we serve. In addition, in many of our service areas, particularly in the Houston area and in Minnesota, we have benefited from growth in the number of customers that also tends to mitigate the effects of reduced consumption.  We anticipate that this growth will continue as the regions experience a continued economic recovery.  The profitability of our businesses is influenced significantly by the regulatory treatment we receive from the various state and local regulators who set our gas distribution rates. In recent rate filings, we have sought rate mechanisms that help to decouple our results from the impacts of weather and variations in usage from levels reflected in rates, but such rate mechanisms have not yet been approved in all jurisdictions. We plan to continue to pursue such decoupling mechanisms in our future rate filings.

Our Field Services and Interstate Pipelines business segments are currently benefiting from their proximity to significant natural gas producing regions in Texas, Arkansas, Oklahoma and Louisiana.  In our Field Services business segment, the development of shale formations has helped offset declines in production from more traditional basins. The recent decline in natural gas prices has contributed to reductions in drilling activity in dry gas shale formations as well, including those served by our Field Services business segment. Many producers have shifted their focus to liquids-rich natural gas or crude oil basins. A reduction in drilling activity may result in lower throughput volumes on our systems as the wells decline over time. However, a significant amount of the volumes gathered by systems we recently developed in shale basins such as the Haynesville and Fayetteville shales are supported by contracts with annual volume commitments, or price adjustment mechanisms that provide for minimum returns on capital deployed. In monitoring performance of the segments, we focus on throughput of the pipelines and gathering systems, and in the case of Field Services, on the number of well-connects. 

Our Competitive Natural Gas Sales and Services business segment contracts with customers for transportation, storage and sales of natural gas on an unregulated basis.  Its operations serve customers in the central and eastern regions of the United States.  The segment benefits from favorable price differentials, either on a geographic basis or on a seasonal basis. While this business utilizes financial derivatives to hedge its exposure to price movements, it does not engage in speculative or proprietary trading and maintains a low value at risk level, or VaR, to avoid significant financial exposures.  Lower geographic and seasonal price differentials during 2010, 2011 and 2012 adversely affected results for this business segment.

The nature of our businesses requires significant amounts of capital investment, and we rely on internally generated cash, borrowings under our credit facility, proceeds from commercial paper and issuances of debt in the capital markets to satisfy these capital needs. We strive to maintain investment grade ratings for our securities in order to access the capital markets on terms we consider reasonable. Our goal is to continue to improve our credit ratings over time. A reduction in our ratings generally would increase our borrowing costs for new issuances of debt, as well as borrowing costs under our existing revolving credit facility, and may prevent us from accessing the commercial paper markets. Disruptions in the financial markets can also affect the availability of new capital on terms we consider attractive. In those circumstances, companies like us may not be able to obtain certain types of external financing or may be required to accept terms less favorable than they would otherwise accept. For that reason, we seek to maintain adequate liquidity for our businesses through existing credit facilities and prudent refinancing of existing debt.

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Consistent with the regulatory treatment of such costs, we can defer the amount of pension expense that differs from the level of pension expense included in our base rates for our Gas Operations in Texas.

Significant Events

Acquisition

On July 31, 2012, we purchased the 50% interest that we did not already own in Waskom Gas Processing Company (Waskom), a Texas general partnership, which owns and operates a natural gas processing plant and natural gas gathering assets, as well as other gathering and related assets from a third-party for approximately $273 million. The amount of the purchase price allocated to the acquisition of the 50% interest in Waskom was approximately $201 million, with the remaining purchase price allocated to the other gathering assets, based on a discounted cash flow methodology. The purchase of the 50% interest in Waskom was determined to be a business combination achieved in stages, and as such we recorded a pre-tax gain of approximately $136 million on July 31, 2012, which is the result of remeasuring our original 50% interest in Waskom to fair value. As a result of the purchase, we recorded goodwill of $24 million, which includes $17 million related to Waskom (including the re-measurement of our existing 50% interest) and $7 million related to the other gathering and related assets.

Goodwill Impairment

We performed our annual impairment test in the third quarter of 2012 and determined that a non-cash goodwill impairment charge in the amount of $252 million was required for our Competitive Natural Gas Sales and Services reportable segment. We also determined that no impairment charge was required for any other reportable segment. The adverse wholesale market conditions facing our energy services business, specifically the prospects for continued low geographic and seasonal price differentials for natural gas, led to a reduction in the estimate of the fair value of goodwill associated with this reporting unit.

CERTAIN FACTORS AFFECTING FUTURE EARNINGS

Our past earnings and results of operations are not necessarily indicative of our future earnings and results of operations. The magnitude of our future earnings and results of our operations will depend on or be affected by numerous factors including:

• state and federal legislative and regulatory actions or developments affecting various aspects of our businesses, including, among others, energy deregulation or re-regulation, pipeline integrity and safety, health care reform, financial reform, tax legislation and actions regarding the rates charged by our regulated businesses;

• state and federal legislative and regulatory actions or developments relating to the environment, including those related to global climate change;

• timely and appropriate rate actions that allow recovery of costs and a reasonable return on investment;

• the timing and outcome of any audits, disputes and other proceedings related to taxes;

• problems with construction, implementation of necessary technology or other issues with respect to major capital projects that result in delays or in cost overruns that cannot be recouped in rates;

• industrial, commercial and residential growth in our service territory and changes in market demand, including the effects of energy efficiency measures and demographic patterns;

• the timing and extent of changes in commodity prices, particularly natural gas and natural gas liquids, the competitive effects of excess pipeline capacity in the regions we serve, and the effects of geographic and seasonal commodity price differentials, including the effects of these circumstances on re-contracting available capacity on our interstate pipelines;

• the timing and extent of changes in the supply of natural gas, particularly supplies available for gathering by our field services business and transporting by our interstate pipelines, including the impact of natural gas and natural gas liquids prices on the level of drilling and production activities in the regions we serve;

• competition in our mid-continent region footprint for access to natural gas supplies and markets;

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• weather variations and other natural phenomena, including the impact on operations and capital of severe weather events;

• any direct or indirect effects on our facilities, operations and financial condition resulting from terrorism, cyber-attacks, data security breaches or other attempts to disrupt our businesses or the businesses of third parties, or other catastrophic events;

• the impact of unplanned facility outages;

• timely and appropriate regulatory actions allowing recovery of costs associated with any future hurricanes or natural disasters;

• changes in interest rates or rates of inflation;

• commercial bank and financial market conditions, our access to capital, the cost of such capital, and the results of our financing and refinancing efforts, including availability of funds in the debt capital markets;

• actions by credit rating agencies;

• effectiveness of our risk management activities;

• inability of various counterparties to meet their obligations to us;

• non-payment for our services due to financial distress of our customers;

• the ability of GenOn Energy, Inc. (GenOn) (formerly known as RRI Energy, Inc., Reliant Energy, Inc. and Reliant Resources, Inc. (RRI)), a wholly owned subsidiary of NRG Energy, Inc. (NRG), and its subsidiaries to satisfy their obligations to us, including indemnity obligations, or obligations in connection with the contractual arrangements pursuant to which we are their guarantor;

• the outcome of litigation brought by or against us;

• our ability to control costs;

• the investment performance of CenterPoint Energy's pension and postretirement benefit plans;

• our potential business strategies, including restructurings, joint ventures, and acquisitions or dispositions of assets or businesses, which we cannot assure you will be completed or will have the anticipated benefits to us;

• acquisition and merger activities involving us or our competitors;

• future economic conditions in regional and national markets and their effect on sales, prices and costs; and

• other factors we discuss under “Risk Factors” in Item 1A of this report and in other reports we file from time to time with the Securities and Exchange Commission (SEC).

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CONSOLIDATED RESULTS OF OPERATIONS

Our results of operations are affected by seasonal fluctuations in the demand for natural gas and price movements of energy commodities as well as natural gas basis differentials.  Our results of operations are also affected by, among other things, the actions of various federal and state governmental authorities having jurisdiction over rates we charge, competition in our various business operations, debt service costs and income tax expense.

The following table sets forth selected financial data (in millions) for the years ended December 31, 2010, 2011 and 2012, followed by a discussion of our consolidated results of operations based on operating income.  We have provided a reconciliation of consolidated operating income to net income below.

	Year Ended December 31,
	2010			2011			2012
Revenues	$	6,569		$	6,102		$	4,901
Expenses:
Natural gas	4,574			4,055			2,873
Operation and maintenance	913			964			951
Depreciation and amortization	248			262			285
Taxes other than income taxes	167			159			146
Goodwill impairment	—			—			252
Total	5,902			5,440			4,507
Operating Income	667			662			394
Interest and other finance charges	(208		)	(190		)	(179		)
Equity in earnings of unconsolidated affiliates	29			30			31
Step acquisition gain	—			—			136
Other income (expense), net	(1		)	1			1
Income Before Income Taxes	487			503			383
Income Tax Expense	187			187			246
Net Income	$	300		$	316		$	137

2012 Compared to 2011.  We reported net income of $137 million for 2012 compared to $316 million for 2011.  The decrease in net income of $179 million was primarily due to a $268 million decrease in operating income (discussed by segment below), including a $252 million non-cash goodwill impairment charge, and a $59 million increase in income tax expense, which were partially offset by a $136 million step acquisition gain related to the acquisition of an additional 50% interest in Waskom and an $11 million decrease in interest and other finance charges due to lower levels of debt.

Income Tax Expense.  We reported an effective tax rate of 64.2% for 2012 compared to 37.2% for 2011.  The increase in our effective tax rate is primarily due to the goodwill impairment of $252 million which is non-deductible for tax in 2012 and higher state tax expense compared to 2011 related to benefits recognized in that prior period for lower blended state rates. The increased rate was partially offset by the release of income tax reserves of $7 million.

2011 Compared to 2010.  We reported net income of $316 million for 2011 compared to $300 million for 2010.  The increase in net income of $16 million was primarily due to a $18 million decrease in interest and other finance charges, partially offset by a $5 million decrease in operating income (discussed by segment below).

Income Tax Expense. We reported an effective tax rate of 37.2% for 2011 compared to 38.4% for 2010.  The decrease in the effective tax rate of 1.2% is due to a $19 million reduction to the deferred tax asset due to the enactment of the Patient Protection and Affordable Care Act and Health Care and Education Reconciliation Act recognized in 2010, a $24 million decrease to state tax expense due to the restructuring of certain subsidiaries in December 2010, and a $20 million state tax benefit primarily attributable to lower blended state tax rates and a reduction to the state deferred tax liability recorded in December 2011.

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RESULTS OF OPERATIONS BY BUSINESS SEGMENT

The following table presents operating income (loss) (in millions) for each of our business segments for 2010, 2011 and 2012. Included in revenues are intersegment sales. We account for intersegment sales as if the sales were to third parties, that is, at current market prices.

Operating Income (Loss) by Business Segment

	Year Ended December 31,
	2010			2011			2012
Natural Gas Distribution	$	231		$	226		$	226
Competitive Natural Gas Sales and Services	16			6			(250		)
Interstate Pipelines	270			248			207
Field Services	151			189			214
Other Operations	(1		)	(7		)	(3		)
Total Consolidated Operating Income (Loss)	$	667		$	662		$	394

Natural Gas Distribution

The following table provides summary data of our Natural Gas Distribution business segment for 2010, 2011 and 2012 (in millions, except throughput and customer data):

	Year Ended December 31,
	2010		2011		2012
Revenues	$	3,213	$	2,841	$	2,342
Expenses:
Natural gas	2,049		1,675		1,196
Operation and maintenance	639		655		637
Depreciation and amortization	166		166		173
Taxes other than income taxes	128		119		110
Total expenses	2,982		2,615		2,116
Operating Income	$	231	$	226	$	226
Throughput (in Bcf):
Residential	177		172		140
Commercial and industrial	249		251		243
Total Throughput	426		423		383
Number of customers at end of period:
Residential	3,016,333		3,036,267		3,058,695
Commercial and industrial	246,891		246,220		246,413
Total	3,263,224		3,282,487		3,305,108

2012 Compared to 2011.  Our Natural Gas Distribution business segment reported operating income of $226 million for each of 2012 and 2011. Operating income was unchanged despite substantially reduced revenues from near record mild temperatures in the first quarter of 2012 that were partially mitigated by weather hedges and weather normalization adjustments ($21 million), increased depreciation and amortization expense ($7 million) and increased property taxes ($4 million). These adverse impacts were offset by certain reduced operation and maintenance expenses ($5 million), lower bad debt expense ($7 million), the addition of over 22,000 customers ($6 million) and rate increases ($12 million). Decreased expense related to energy efficiency programs ($4 million) and decreased expense related to lower gross receipts taxes ($12 million) were offset by a corresponding reduction in the related revenues.

2011 Compared to 2010.  Our Natural Gas Distribution business segment reported operating income of $226 million for 2011 compared to $231 million for 2010. Operating income decreased $5 million primarily as a result of higher benefit costs ($8 million), lower miscellaneous revenues ($7 million) and higher other expenses ($9 million). These were partially offset by the addition of 19,000 customers ($5 million), lower bad debt expense ($8 million) and rate increases ($7 million).  Increased expense related to

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energy efficiency programs ($19 million) and decreased expense related to lower gross receipt taxes ($10 million) were offset by the related revenues.

Competitive Natural Gas Sales and Services

The following table provides summary data of our Competitive Natural Gas Sales and Services business segment for 2010, 2011 and 2012 (in millions, except throughput and customer data):

	Year Ended December 31,
	2010		2011		2012
Revenues	$	2,651	$	2,511	$	1,784
Expenses:
Natural gas	2,591		2,458		1,730
Operation and maintenance	38		41		45
Depreciation and amortization	4		5		6
Taxes other than income taxes	2		1		1
Goodwill impairment	—		—		252
Total expenses	2,635		2,505		2,034
Operating Income (Loss)	$	16	$	6	$	(250	)
Throughput (in Bcf)	548		558		562
Number of customers at end of period (1)	12,193		14,267		16,330

___________________

(1) These numbers do not include approximately 12,700 natural gas customers as of December 31, 2012 that are under residential and small commercial choice programs invoiced by their host utility.

2012 Compared to 2011. Our Competitive Natural Gas Sales and Services business segment reported operating income, excluding the goodwill impairment discussed below, of $2 million for 2012 compared to $6 million for 2011.  The decrease in operating income of $4 million was primarily due to a $24 million negative impact of mark-to-market accounting for derivatives associated with certain forward natural gas purchases and sales used to lock in economic margins. 2012 included mark-to-market charges of $16 million compared to a $8 million benefit for the same period of 2011.  Substantially offsetting this decrease was a $20 million improvement in operating margins primarily as a result of the termination of uneconomic transportation contracts and an increase in retail sales customers and volumes.

2011 Compared to 2010. Our Competitive Natural Gas Sales and Services business segment reported operating income of $6 million for 2011 compared to $16 million for 2010.  The decrease in operating income of $10 million was primarily due to reduced basis spreads on pipeline transport opportunities and decreased seasonal storage spreads of $9 million in 2011, which included a $5 million charge related to an early capacity release on pipeline transportation, as compared to 2010.  Additionally, an $11 million write-down of natural gas inventory to the lower of cost or market occurred in 2011 as compared to a $6 million write-down in 2010. Offsetting these decreases to operating income is an increase in operating income of $4 million related to the favorable impact of the mark-to-market valuation for non-trading financial derivatives for 2011 of $8 million versus the favorable impact of $4 million for 2010.

Goodwill Impairment

A non-cash goodwill impairment charge of $252 million for our Competitive Natural Gas Sales and Services business segment was recorded in 2012. The adverse wholesale market conditions facing our energy services business, specifically the prospects for continued low geographic and seasonal price differentials for natural gas, led to a reduction in our estimate of the fair value of goodwill associated with this reporting unit. See Note 4 to our consolidated financial statements for further discussion of the goodwill impairment charge.

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Interstate Pipelines

The following table provides summary data of our Interstate Pipelines business segment for 2010, 2011 and 2012 (in millions, except throughput data):

	Year Ended December 31,
	2010		2011		2012
Revenues	$	601	$	553	$	502
Expenses:
Natural gas	93		67		57
Operation and maintenance	153		152		153
Depreciation and amortization	52		54		56
Taxes other than income taxes	33		32		29
Total expenses	331		305		295
Operating Income	$	270	$	248	$	207
Equity in earnings of unconsolidated affiliates	$	19	$	21	$	26
Transportation throughput (in Bcf)	1,693		1,579		1,367

2012 Compared to 2011.  Our Interstate Pipeline business segment reported operating income of $207 million for 2012 compared to $248 million for 2011. Operating income decreased $41 million primarily due to lower margins resulting from a backhaul contract that expired in 2011 ($16 million), as well as the associated reduction in compressor efficiency ($8 million) on the Carthage to Perryville pipeline due to lower volumes, lower off-system transportation revenues ($8 million), lower seasonal and market-sensitive transportation contracts ($7 million) and ancillary services ($7 million). These margin decreases were partially offset by the effects of the 10-year agreement with our natural gas distribution affiliate ($5 million) which we restructured in 2010. Operating income decreases due to higher operations and maintenance expenses ($1 million) and higher depreciation and amortization expenses ($2 million) due to asset additions were offset by lower taxes other than income taxes ($3 million).

2011 Compared to 2010.  Our Interstate Pipeline business segment reported operating income of $248 million for 2011 compared to $270 million for 2010. Operating income decreased $22 million primarily due to a backhaul contract that expired in 2011 ($22 million), as well as the effects of the restructured 10-year agreement with our natural gas distribution affiliate ($11 million) and lower off-system revenues ($11 million). These margin decreases were partially offset by new firm transportation contracts and higher ancillary revenues ($22 million). Operating income increases due to lower operation and maintenance expenses ($1 million) and lower taxes other than income ($1 million) were offset by increased depreciation and amortization expenses ($2 million) related to new assets.

Equity Earnings. In addition, this business segment recorded equity income of $19 million, $21 million and $26 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in SESH, a jointly-owned pipeline. The 2012 increase in equity earnings primarily resulted from restructuring and extending a long-term agreement with an anchor shipper at the end of 2011. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption in the Statements of Consolidated Income.

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Field Services

The following table provides summary data of our Field Services business segment for 2010, 2011 and 2012 (in millions, except throughput data):

	Year Ended December 31,
	2010		2011		2012
Revenues	$	338	$	412	$	506
Expenses:
Natural gas	72		68		122
Operation and maintenance	85		112		115
Depreciation and amortization	25		37		50
Taxes other than income taxes	5		6		5
Total expenses	187		223		292
Operating Income	$	151	$	189	$	214
Equity in earnings of unconsolidated affiliates	$	10	$	9	$	5
Gathering throughput (in Bcf)	650		823		896

2012 Compared to 2011.  Our Field Services business segment reported operating income of $214 million for 2012 compared to $189 million for 2011. Operating income increased $25 million primarily from increased margins ($36 million) due to gathering projects in the Haynesville shale, including revenues from throughput guarantees, growth in gathering services and retained natural gas volumes, and acquisitions completed during 2012 ($13 million), partially offset by lower commodity prices ($28 million) on sales of retained natural gas. Operating income also increased ($3 million) due to the classification of earnings from the 50% partnership interest in Waskom which we already owned as operating income beginning in August 2012 instead of equity earnings as reported for prior periods, due to our July 31, 2012 purchase of the 50% interest in Waskom that we did not already own. Lower operation and maintenance expenses ($7 million) were partially offset by higher depreciation expense ($6 million).

2011 Compared to 2010.  Our Field Services business segment reported operating income of $189 million for 2011 compared to $151 million for 2010. Operating income increased $38 million primarily from increased margins due to gathering projects in the Haynesville and Fayetteville shales and growth in core gathering services, including revenues from throughput guarantees ($88 million), partially offset by lower commodity prices ($10 million) from sales of retained natural gas and reduced processing margins. Increases in operation and maintenance expenses ($6 million), depreciation expense ($12 million) and taxes other than income ($1 million) resulted primarily from the expansion of the Magnolia and Olympia gathering systems in North Louisiana. In addition, operating expenses in 2010 benefited from a gain on the sale of non-strategic gathering assets ($21 million).

Equity Earnings. In addition, this business segment recorded equity income of $10 million, $9 million and $5 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in Waskom. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption in the Statements of Consolidated Income. As discussed above, beginning on August 1, 2012, financial results for Waskom are included in operating income.

Fluctuations in Commodity Prices and Derivative Instruments

For information regarding our exposure to risk as a result of fluctuations in commodity prices and derivative instruments, please read “Quantitative and Qualitative Disclosures About Market Risk” in Item 7A of this report.

LIQUIDITY AND CAPITAL RESOURCES

Our liquidity and capital requirements are affected primarily by our results of operations, capital expenditures, debt service requirements, tax payments, working capital needs, various regulatory actions and appeals relating to such actions. Our principal anticipated cash requirements for 2013 include capital expenditures of approximately $903 million and the retirement of long-term debt of $365 million.

We expect that borrowings under our credit facility, proceeds from commercial paper, anticipated cash flows from operations and intercompany borrowings will be sufficient to meet our anticipated cash needs in 2013.

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Discretionary financing or refinancing may result in the issuance of debt securities in the capital markets or the arrangement of additional credit facilities. Issuances of debt in the capital markets, funds raised in the commercial paper markets and additional credit facilities may not, however, be available to us on acceptable terms.

The following table sets forth our capital expenditures for 2012 and estimates of our capital expenditures for currently identified and planned projects for 2013 through 2017 (in millions):

	2012		2013		2014		2015		2016		2017
Natural Gas Distribution	$	359	$	422	$	420	$	400	$	387	$	393
Competitive Natural Gas Sales and Services	6		9		25		37		36		11
Interstate Pipelines	132		201		212		128		136		126
Field Services	52		271		114		88		70		71
Total	$	549	$	903	$	771	$	653	$	629	$	601

Our capital expenditures are expected to be used for investment in infrastructure for our natural gas transmission, distribution and gathering operations. These capital expenditures are anticipated to maintain reliability and safety as well as expand our systems through value-added projects.

The following table sets forth estimates of our contractual obligations, including payments due by period (in millions):

Contractual Obligations	Total		2013		2014-2015		2016-2017		2018 and thereafter
Long-term debt	$	2,641	$	365	$	160	$	575	$	1,541
Interest payments — long-term debt(1)	1,645		148		251		217		1,029
Short-term borrowings	38		38		—		—		—
Operating leases(2)	46		12		13		8		13
Benefit obligations(3)	—		—		—		—		—
Purchase obligations(4)	4		4		—		—		—
Non-trading derivative liabilities	16		14		2		—		—
Other commodity commitments(5)	1,389		430		558		245		156
Total contractual cash obligations	$	5,779	$	1,011	$	984	$	1,045	$	2,739

_______________

(1) We calculated estimated interest payments for long-term debt as follows: for fixed-rate debt and term debt, we calculated interest based on the applicable rates and payment dates; for variable-rate debt and/or non-term debt, we used interest rates as of December 31, 2012. We expect to satisfy such interest payment obligations with cash flows from operations and short-term borrowings.

(2) For a discussion of operating leases, please read Note 12(c) to our consolidated financial statements.

(3) We expect to contribute approximately $8 million to our postretirement benefits plan in 2013 to fund a portion of our obligations in accordance with rate orders or to fund pay-as-you-go costs associated with the plan.

(4) Represents capital commitments for material in connection with our Interstate Pipelines business segment.

(5) For a discussion of other commodity commitments, please read Note 12(a) to our consolidated financial statements.

Off-Balance Sheet Arrangements.  Other than the guaranties discussed below and operating leases, we have no off-balance sheet arrangements.

Prior to the distribution of CenterPoint Energy's ownership in RRI to its shareholders, we had guaranteed certain contractual obligations of what became RRI’s trading subsidiary.  When the companies separated, RRI agreed to secure us against obligations under the guaranties RRI had been unable to extinguish by the time of separation.  Pursuant to such agreement, as amended in December 2007, RRI (now GenOn) agreed to provide to us cash or letters of credit as security against our obligations under our remaining guaranties for demand charges under certain gas transportation agreements if and to the extent changes in market conditions

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expose us to a risk of loss on those guaranties based on an annual calculation, with any required collateral to be posted each December.  The undiscounted maximum potential payout of the demand charges under these transportation contracts, which will be in effect until 2018, was approximately $73 million as of December 31, 2012.  Based on market conditions in the fourth quarter of 2012 at the time the most recent annual calculation was made under the agreement, GenOn was not obligated to post any security. As a result, we returned to GenOn in the fourth quarter of 2012 the approximately $28 million of aggregate collateral previously posted by GenOn under the agreement. If GenOn should fail to perform the contractual obligations, we could have to honor our guarantee and, in such event, any collateral then provided as security may be insufficient to satisfy our obligations.

Regulatory Matters. Regulatory developments that have occurred since our 2011 Form 10-K was filed with the SEC are discussed below.

Gas Operations

Beaumont/East Texas Rate Case. In July 2012, our natural gas distribution business (Gas Operations) filed a general rate case with the Railroad Commission of Texas (Railroad Commission) and certain municipalities requesting an increase of approximately $8.6 million based on a proposed rate of return of 9.09%, a return on equity (ROE) of 11.00%, and a capital structure with 42% debt and 58% equity. Rates went into effect in August 2012 for 24 cities.  All other cities suspended the rates for up to 90 days or denied any increase outright. The Railroad Commission suspended the rates for the environs and for the cities that have given up original jurisdiction for up to 150 days. On November 5, 2012, rates went into effect for another 13 cities. On November 15, 2012, a Unanimous Settlement Agreement was signed by all parties and resolved all issues resulting in a net revenue requirement increase of $6.2 million. On December 4, 2012, the Railroad Commission approved the Unanimous Settlement Agreement of $6.2 million and rates went into effect on December 7, 2012. Beginning January 2, 2013, a rate case expense surcharge of $0.16 was implemented and will only affect customers in the cities that gave up original jurisdictions and cities and environs of all parties involved in the Unanimous Settlement Agreement. The rate case expense surcharge will continue over the next 36 months or until all approved expenses are collected.

Mississippi Regulatory Rate Adjustment (RRA).In May 2012, Gas Operations and the Mississippi Public Utility Staff filed a joint stipulation for the revised RRA and initial Weather Normalization Adjustment which the Mississippi Public Service Commission (MPSC) approved in May 2012.   In June 2012, Gas Operations requested an annual increase of approximately $2.2 million under the newly revised RRA based on calendar year 2011. New rates reflecting an increase of approximately $1.7 million, as approved by the MPSC, took effect on September 20, 2012.

Minnesota Conservation Improvement Program (CIP).In May 2012, Gas Operations filed a request with the Minnesota Public Utilities Commission (MPUC) for a $4.6 million CIP incentive. The MPUC approved the incentive in December 2012.

Oklahoma Performance Based Rate Change (PBRC).In March 2012, Gas Operations filed a PBRC with the Oklahoma Corporation Commission (OCC) showing that it had earnings for 2011 above the prescribed threshold and would refund approximately $1.9 million to customers beginning in July 2012.  The OCC issued a final order approving the refund on June 6, 2012.   

Houston and South Texas Gas Reliability Infrastructure Programs (GRIP). Gas Operations' Houston and South Texas Divisions each submitted annual GRIP filings on March 30, 2012.  For the Houston division, the filing was to recover costs related to $51.2 million in incremental capital expenditures that were incurred in 2011.  The increase in revenue requirements for this filing period was $9.4 million annually based on an authorized rate of return of 8.65%.  For the South Texas division, the filing was to recover costs related to $14.5 million in incremental capital expenditures that were incurred since the last rate case.  The increase in revenue requirements for this filing period was $2.4 million annually based on an authorized rate of return of 8.75%.  In June 2012, the Railroad Commission approved both GRIP applications as filed, and the new rates were implemented in July 2012 in the applicable cities, with the exception of Houston and Pasadena. Lower GRIP rates were implemented in July 2012 for these two cities, subject to final action by the Railroad Commission. In September 2012, the Railroad Commission approved the GRIP rates as originally filed and the rates were then implemented in the two remaining cities.

City of Houston Gas Utility Rate Inquiry.  In July 2012, the City Council of Houston adopted an ordinance to initiate a formal inquiry regarding the reasonableness of the rates charged by Gas Operations in its Houston service territory.  On January 16, 2013, the City Council of Houston voted to require a rate filing by Gas Operations by March 22, 2013. We have reached an agreement with the City of Houston to postpone filing of a response to the rate inquiry until at least September 2013.

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Interstate Pipelines

CenterPoint Energy-Mississippi River Transmission, LLC Rate Filing. In August 2012, our subsidiary, CenterPoint Energy-Mississippi River Transmission, LLC (MRT), an interstate pipeline that provides natural gas transportation, natural gas storage and pipeline services to customers principally in Arkansas, Illinois and Missouri, made a rate filing with the Federal Energy Regulatory Commission (FERC) pursuant to Section 4 of the Natural Gas Act. In its filing, MRT requested an annual cost of service of $103.8 million (an increase of approximately $47.3 million above the annual cost of service underlying the current FERC approved maximum rates for MRT's pipeline), new depreciation rates, an overall rate of return of 10.813% (based on a return on equity of 13.62%), a regulatory compliance cost (RCC) surcharge with a true-up mechanism to recover safety, environmental, and security costs associated with mandated requirements and billing determinants reflecting no adjustments for MRT's conversion of a portion of CenterPoint Energy Gas Transmission Company, LLC’s (CEGT) firm capacity to a lease. In August 2012, a number of parties filed protests in response to MRT's rate filing. In September 2012, the FERC issued an order accepting MRT's filing, suspending the filed tariff rates for the full statutorily permitted five month suspension period and setting certain issues for hearing. In particular, the FERC limited the scope of the RCC surcharge set for hearing to the recovery of only security costs. In October 2012, MRT requested rehearing as to the proper scope of the RCC surcharge. The procedural schedule for the rate filing contemplates a hearing at the FERC in the third quarter of 2013.

CEGT Rate Settlement Proceeding. In an effort to avoid the expense of a rate case, in October 2012 CEGT initiated a settlement process with its customers. Should these discussions fail, CEGT will consider filing with the FERC for a general rate increase in 2013. CEGT will attempt to reach a mutually agreeable rate solution with its customers to recover the increased costs to maintain a safe and reliable system, but there can be no assurance that it will be successful or will avoid the initiation of a general rate case filing.

Credit Facility.  As of February 14, 2013, we had the following revolving credit facility (in millions): 

Date Executed	Size of Facility		Amount Utilized at February 14, 2013	Termination Date
September 9, 2011	$	950	—	September 9, 2016

CERC Corp.'s $950 million credit facility can be drawn at the London Interbank Offered Rate (LIBOR) plus 150 basis points based on our current credit ratings. The facility contains a debt to total capitalization covenant which limits debt to 65% of our total capitalization.

Borrowings under the facility are subject to customary terms and conditions. However, there is no requirement that we make representations prior to borrowings as to the absence of material adverse changes or litigation that could be expected to have a material adverse effect. Borrowings under the credit facility are subject to acceleration upon the occurrence of events of default that we consider customary. The facility provides for customary fees, including commitment fees, administrative agent fees, fees in respect of letters of credit and other fees. The LIBOR borrowing spread and the commitment fees fluctuate based on our credit rating. We are currently in compliance with the various business and financial covenants in our revolving credit facility.

CERC Corp.'s $950 million credit facility backstops a $915 million commercial paper program. As of December 31, 2012, CERC Corp. had no outstanding commercial paper. As a result of the credit ratings on our commercial paper program, we do not expect to be able to rely on the sale of commercial paper to fund all of our short-term borrowing requirements.

During 2012, we met substantially all of our liquidity requirements with borrowings from the money pool described below under “—Money Pool.”  During the fourth quarter of 2012, we also met a portion of our liquidity requirements with commercial paper proceeds.  We currently expect that we may be required to access financing sources in addition to money pool borrowings in order to satisfy our liquidity requirements in 2013.  These sources could include commercial paper proceeds or borrowings under our revolving credit facility.

Securities Registered with the SEC.  We have filed a shelf registration statement with the SEC registering an indeterminate principal amount of our senior debt securities.

Temporary Investments.  As of February 14, 2013, we had no external temporary investments.

Money Pool.  We participate in a money pool through which we and certain of our affiliates can borrow or invest on a short-term basis. Funding needs are aggregated and external borrowing or investing is based on the net cash position. The net funding

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requirements of the money pool are expected to be met with borrowings by CenterPoint Energy under its revolving credit facility or the sale by CenterPoint Energy of its commercial paper. At February 14, 2013, we had borrowings of $566 million from the money pool.  The money pool may not provide sufficient funds to meet our cash needs.

Impact on Liquidity of a Downgrade in Credit Ratings.  The interest on borrowings under our credit facilities is based on our credit rating. As of February 14, 2013, Moody’s Investors Service, Inc. (Moody’s), Standard & Poor’s Rating Services (S&P), a division of The McGraw-Hill Companies, and Fitch, Inc. (Fitch) had assigned the following credit ratings to our senior unsecured debt:

Moody’s		S&P		Fitch
Rating	Outlook (1)	Rating	Outlook (2)	Rating	Outlook (3)
Baa2	Stable	BBB+	Stable	BBB	Stable

_______________

(1) A Moody’s rating outlook is an opinion regarding the likely direction of a rating over the medium term.

(2) An S&P rating outlook assesses the potential direction of a long-term credit rating over the intermediate to longer term.

(3) A Fitch rating outlook encompasses a one-to-two year horizon as to the likely ratings direction.

We cannot assure you that the ratings set forth above will remain in effect for any given period of time or that one or more of these ratings will not be lowered or withdrawn entirely by a rating agency. We note that these credit ratings are included for informational purposes and are not recommendations to buy, sell or hold our securities and may be revised or withdrawn at any time by the rating agency. Each rating should be evaluated independently of any other rating. Any future reduction or withdrawal of one or more of our credit ratings could have a material adverse impact on our ability to obtain short- and long-term financing, the cost of such financings and the execution of our commercial strategies.

A decline in these credit ratings could increase borrowing costs under our $950 million credit facility. If our credit ratings had been downgraded one notch by each of the three principal credit rating agencies from the ratings that existed at December 31, 2012, the impact on the borrowing costs under our credit facility would have been immaterial. A decline in credit ratings would also increase the interest rate on long-term debt to be issued in the capital markets and could negatively impact our ability to complete capital market transactions and to access the commercial paper markets. Additionally, a decline in credit ratings could increase cash collateral requirements and reduce earnings of our Natural Gas Distribution and Competitive Natural Gas Sales and Services business segments.

We and our subsidiaries purchase natural gas from one of our suppliers under supply agreements that contain an aggregate credit threshold of $120 million based on CERC Corp.’s S&P senior unsecured long-term debt rating of BBB+. Under these agreements, we may need to provide collateral if the aggregate threshold is exceeded. Upgrades and downgrades from this BBB+ rating will increase and decrease the aggregate credit threshold accordingly.

CenterPoint Energy Services, Inc. (CES), our wholly owned subsidiary operating in our Competitive Natural Gas Sales and Services business segment, provides comprehensive natural gas sales and services primarily to commercial and industrial customers and electric and gas utilities throughout the central and eastern United States. In order to economically hedge its exposure to natural gas prices, CES uses derivatives with provisions standard for the industry, including those pertaining to credit thresholds. Typically, the credit threshold negotiated with each counterparty defines the amount of unsecured credit that such counterparty will extend to CES. To the extent that the credit exposure that a counterparty has to CES at a particular time does not exceed that credit threshold, CES is not obligated to provide collateral. Mark-to-market exposure in excess of the credit threshold is routinely collateralized by CES. As of December 31, 2012, the amount posted as collateral aggregated approximately $21 million. Should the credit ratings of CERC Corp. (as the credit support provider for CES) fall below certain levels, CES would be required to provide additional collateral up to the amount of its previously unsecured credit limit. We estimate that as of December 31, 2012, unsecured credit limits extended to CES by counterparties aggregate $335 million and $6 million of such amount was utilized.

Pipeline tariffs and contracts typically provide that if the credit ratings of a shipper or the shipper’s guarantor drop below a threshold level, which is generally investment grade ratings from both Moody’s and S&P, cash or other collateral may be demanded from the shipper in an amount equal to the sum of three months’ charges for pipeline services plus the unrecouped cost of any lateral built for such shipper. If the credit ratings of CERC Corp. decline below the applicable threshold levels, we might need to provide cash or other collateral of as much as $179 million as of December 31, 2012. The amount of collateral will depend on seasonal variations in transportation levels.

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Cross Defaults. Under CenterPoint Energy’s revolving credit facility, a payment default on, or a non-payment default that permits acceleration of, any indebtedness exceeding $75 million by us will cause a default. In addition, three outstanding series of CenterPoint Energy’s senior notes, aggregating $750 million in principal amount as of December 31, 2012, provide that a payment default by us in respect of, or an acceleration of, borrowed money and certain other specified types of obligations, in the aggregate principal amount of $50 million, will cause a default. A default by CenterPoint Energy would not trigger a default under our debt instruments or bank credit facility.

Possible Acquisitions, Divestitures and Joint Ventures.  From time to time, we consider the acquisition or the disposition of assets or businesses or possible joint ventures or other joint ownership arrangements with respect to assets or businesses. Any determination to take any action in this regard will be based on market conditions and opportunities existing at the time, and accordingly, the timing, size or success of any efforts and the associated potential capital commitments are unpredictable. We may seek to fund all or part of any such efforts with proceeds from debt issuances. Debt financing may not, however, be available to us at that time due to a variety of events, including, among others, maintenance of our credit ratings, industry conditions, general economic conditions, market conditions and market perceptions.

Other Factors that Could Affect Cash Requirements.  In addition to the above factors, our liquidity and capital resources could be affected by:

• cash collateral requirements that could exist in connection with certain contracts, including our weather hedging arrangements, and gas purchases, gas price and gas storage activities of our Natural Gas Distribution and Competitive Natural Gas Sales and Services business segments;

• acceleration of payment dates on certain gas supply contracts under certain circumstances, as a result of increased gas prices and concentration of natural gas suppliers;

• increased costs related to the acquisition of natural gas;

• increases in interest expense in connection with debt refinancings and borrowings under credit facilities;

• various legislative or  regulatory actions;

• incremental collateral, if any, that may be required due to regulation of derivatives;

• the ability of GenOn and its subsidiaries to satisfy their obligations in respect of GenOn’s indemnity obligations to CenterPoint Energy and its subsidiaries or in connection with the contractual obligations to a third party pursuant to which we are their guarantor;

• delays in cash collections attributable to billing delays;

• slower customer payments and increased write-offs of receivables due to higher gas prices or changing economic conditions;

• the outcome of litigation brought by and against us;

• restoration costs and revenue losses resulting from future natural disasters such as hurricanes and the timing of recovery of such restoration costs; and

• various other risks identified in “Risk Factors” in Item 1A of this report.

Certain Contractual Limits on Our Ability to Issue Securities and Borrow Money. Our revolving credit facility limits our debt as a percentage of our total capitalization to 65%.

Relationship with CenterPoint Energy. We are an indirect wholly owned subsidiary of CenterPoint Energy. As a result of this relationship, the financial condition and liquidity of our parent company could affect our access to capital, our credit standing and our financial condition.

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CRITICAL ACCOUNTING POLICIES

A critical accounting policy is one that is both important to the presentation of our financial condition and results of operations and requires management to make difficult, subjective or complex accounting estimates. An accounting estimate is an approximation made by management of a financial statement element, item or account in the financial statements. Accounting estimates in our historical consolidated financial statements measure the effects of past business transactions or events, or the present status of an asset or liability. The accounting estimates described below require us to make assumptions about matters that are highly uncertain at the time the estimate is made. Additionally, different estimates that we could have used or changes in an accounting estimate that are reasonably likely to occur could have a material impact on the presentation of our financial condition, results of operations or cash flows. The circumstances that make these judgments difficult, subjective and/or complex have to do with the need to make estimates about the effect of matters that are inherently uncertain. Estimates and assumptions about future events and their effects cannot be predicted with certainty. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments. These estimates may change as new events occur, as more experience is acquired, as additional information is obtained and as our operating environment changes. Our significant accounting policies are discussed in Note 2 to our consolidated financial statements. We believe the following accounting policies involve the application of critical accounting estimates. Accordingly, these accounting estimates have been reviewed and discussed with the audit committee of the board of directors of CenterPoint Energy.

Accounting for Rate Regulation

Accounting guidance for regulated operations provides that rate-regulated entities account for and report assets and liabilities consistent with the recovery of those incurred costs in rates if the rates established are designed to recover the costs of providing the regulated service and if the competitive environment makes it probable that such rates can be charged and collected. Our Natural Gas Distribution business segment and portions of our Interstate Pipelines business segment apply this accounting guidance. Certain expenses and revenues subject to utility regulation or rate determination normally reflected in income are deferred on the balance sheet as regulatory assets or liabilities and are recognized in income as the related amounts are included in service rates and recovered from or refunded to customers.  Regulatory assets and liabilities are recorded when it is probable that these items will be recovered or reflected in future rates.  Determining probability requires significant judgment on the part of management and includes, but is not limited to, consideration of testimony presented in regulatory hearings, proposed regulatory decisions, final regulatory orders and the strength or status of applications for rehearing or state court appeals.  If events were to occur that would make the recovery of these assets and liabilities no longer probable, we would be required to write off or write down these regulatory assets and liabilities.  At December 31, 2012, we had recorded regulatory assets of $105 million and regulatory liabilities of $619 million.

Impairment of Long-Lived Assets and Intangibles

We review the carrying value of our long-lived assets, including goodwill and identifiable intangibles, whenever events or changes in circumstances indicate that such carrying values may not be recoverable, and at least annually for goodwill as required by accounting guidance for goodwill and other intangible assets. Unforeseen events and changes in circumstances and market conditions and material differences in the value of long-lived assets and intangibles due to changes in estimates of future cash flows, interest rates, regulatory matters and operating costs could negatively affect the fair value of our assets and result in an impairment charge.

We performed our annual impairment test in the third quarter of 2012 and determined that a non-cash goodwill impairment charge in the amount of $252 million was required for the Competitive Natural Gas Sales and Services reportable segment. We also determined that no impairment charge was required for any other reportable segments. The adverse wholesale market conditions facing our energy services business, specifically the prospects for continued low geographic and seasonal price differentials for natural gas, led to a reduction in the estimate of the fair value of goodwill associated with this reporting unit.

Fair value is the amount at which the asset could be bought or sold in a current transaction between willing parties and may be estimated using a number of techniques, including quoted market prices or valuations by third parties, present value techniques based on estimates of cash flows, or multiples of earnings or revenue performance measures. The fair value of the asset could be different using different estimates and assumptions in these valuation techniques.

Unbilled Energy Revenues

Revenues related to natural gas sales and services are generally recognized upon delivery to customers. However, the determination of deliveries to individual customers is based on the reading of their meters, which is performed on a systematic basis

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throughout the month. At the end of each month, deliveries to customers since the date of the last meter reading are estimated and the corresponding unbilled revenue is estimated. Unbilled natural gas sales are estimated based on estimated purchased gas volumes, estimated lost and unaccounted for gas and tariffed rates in effect. As additional information becomes available, or actual amounts are determinable, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.

NEW ACCOUNTING PRONOUNCEMENTS

See Note 2(n) to our consolidated financial statements, incorporated herein by reference, for a discussion of new accounting pronouncements that affect us.

OTHER SIGNIFICANT MATTERS

Pension Plans. As discussed in Note 6(a) to our consolidated financial statements, we participate in CenterPoint Energy's qualified and non-qualified pension plans covering substantially all employees. The expected pension cost for 2013 is $30 million, of which we expect $24 million to impact pre-tax earnings, based on an expected return on plan assets of 8.00% and a discount rate of 4.00% as of December 31, 2012. We recorded pension expense of $34 million for the year ended December 31, 2012.  Future changes in plan asset returns, assumed discount rates and various other factors related to the pension plans will impact our future pension expense. We cannot predict with certainty what these factors will be in the future.

Item 7A.  Quantitative and Qualitative Disclosures About Market Risk

Impact of Changes in Interest Rates and Energy Commodity Prices

We are exposed to various market risks. These risks arise from transactions entered into in the normal course of business and are inherent in our consolidated financial statements. Most of the revenues and income from our business activities are impacted by market risks. Categories of market risk include exposure to commodity prices through non-trading activities and interest rates. A description of each market risk is set forth below:

• Commodity price risk results from exposures to changes in spot prices, forward prices and price volatilities of commodities, such as natural gas, natural gas liquids and other energy commodities.

• Interest rate risk primarily results from exposures to changes in the level of borrowings and changes in interest rates.

Management has established comprehensive risk management policies to monitor and manage these market risks. We manage these risk exposures through the implementation of our risk management policies and framework. We manage our commodity price risk exposures through the use of derivative financial instruments and derivative commodity instrument contracts. During the normal course of business, we review our hedging strategies and determine the hedging approach we deem appropriate based upon the circumstances of each situation.

Derivative instruments such as futures, forward contracts, swaps and options derive their value from underlying assets, indices, reference rates or a combination of these factors. These derivative instruments include negotiated contracts, which are referred to as over-the-counter derivatives, and instruments that are listed and traded on an exchange.

Derivative transactions are entered into in our non-trading operations to manage and hedge certain exposures, such as exposure to changes in natural gas prices. We believe that the associated market risk of these instruments can best be understood relative to the underlying assets or risk being hedged.

Interest Rate Risk

As of December 31, 2012, we had outstanding long-term debt and borrowings from affiliates that subject us to the risk of loss associated with movements in market interest rates.

Our floating-rate obligations aggregated $667 million and $779 million at December 31, 2011 and 2012, respectively. If the floating interest rates were to increase by 10% from December 31, 2012 rates, our combined interest expense would increase by less than $1 million annually.

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As of December 31, 2011 and 2012, we had outstanding fixed-rate debt aggregating $2.6 billion and $2.7 billion, respectively, in principal amount and having a fair value of $3.0 billion and $3.1 billion, respectively. Because these instruments are fixed-rate, they do not expose us to the risk of loss in earnings due to changes in market interest rates (please read Note 10 to our consolidated financial statements). However, the fair value of these instruments would increase by approximately $79 million if interest rates were to decline by 10% from their levels at December 31, 2012. In general, such an increase in fair value would impact earnings and cash flows only if we were to reacquire all or a portion of these instruments in the open market prior to their maturity.

Commodity Price Risk From Non-Trading Activities

We use derivative instruments as economic hedges to offset the commodity price exposure inherent in our businesses. The stand-alone commodity risk created by these instruments, without regard to the offsetting effect of the underlying exposure these instruments are intended to hedge, is described below. We measure the commodity risk of our non-trading energy derivatives using a sensitivity analysis. The sensitivity analysis performed on our non-trading energy derivatives measures the potential loss in fair value based on a hypothetical 10% movement in energy prices. At December 31, 2012, the recorded fair value of our non-trading energy derivatives was a net asset of $17 million (before collateral), all of which is related to our Competitive Natural Gas Sales and Services business segment. An increase of 10% in the market prices of energy commodities from their December 31, 2012 levels would have decreased the fair value of our non-trading energy derivatives net asset by $1 million.

The above analysis of the non-trading energy derivatives utilized for commodity price risk management purposes does not include the favorable impact that the same hypothetical price movement would have on our non-derivative physical purchases and sales of natural gas to which the hedges relate. Furthermore, the non-trading energy derivative portfolio is managed to complement the physical transaction portfolio, reducing overall risks within limits. Therefore, the adverse impact to the fair value of the portfolio of non-trading energy derivatives held for hedging purposes associated with the hypothetical changes in commodity prices referenced above is expected to be substantially offset by a favorable impact on the underlying hedged physical transactions.

36

Item 8.  Financial Statements and Supplementary Data

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholder of

CenterPoint Energy Resources Corp.

Houston, Texas

We have audited the accompanying consolidated balance sheets of CenterPoint Energy Resources Corp. and subsidiaries (the "Company", an indirect wholly owned subsidiary of CenterPoint Energy, Inc.) as of December 31, 2012 and 2011, and the related statements of consolidated income, comprehensive income, stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2012. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our 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 audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes 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, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of CenterPoint Energy Resources Corp. and subsidiaries at December 31, 2012 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

March 8, 2013

37

MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL

OVER FINANCIAL REPORTING

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of 1934 as a process designed by, or under the supervision of, the company’s principal executive and principal financial officers and effected by the company’s board of directors, management and other personnel, 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 and includes those policies and procedures that:

• Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the company;

• 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

• 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.

Management has designed its internal control over financial reporting to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with accounting principles generally accepted in the United States of America. Management’s assessment included review and testing of both the design effectiveness and operating effectiveness of controls over all relevant assertions related to all significant accounts and disclosures in the financial statements.

All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. 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.

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of 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. Based on our evaluation under the framework in Internal Control — Integrated Framework, our management has concluded that our internal control over financial reporting was effective as of December 31, 2012.

This annual report does not include an attestation report of our independent registered public accounting firm regarding internal control over financial reporting.  Management’s report was not subject to attestation by our independent registered public accounting firm pursuant to rules of the Securities and Exchange Commission that permit us to provide only management’s report in this annual report.

/s/  DAVID M. MCCLANAHAN

President and Chief Executive Officer

/s/  GARY L. WHITLOCK

Executive Vice President and Chief

Financial Officer

March 8, 2013

38

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

STATEMENTS OF CONSOLIDATED INCOME

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Revenues	$	6,569		$	6,102		$	4,901
Expenses:
Natural gas	4,574			4,055			2,873
Operation and maintenance	913			964			951
Depreciation and amortization	248			262			285
Taxes other than income taxes	167			159			146
Goodwill impairment	—			—			252
Total	5,902			5,440			4,507
Operating Income	667			662			394
Other Income (Expense):
Interest and other finance charges	(208		)	(190		)	(179		)
Equity in earnings of unconsolidated affiliates	29			30			31
Step acquisition gain	—			—			136
Other, net	(1		)	1			1
Total	(180		)	(159		)	(11		)
Income Before Income Taxes	487			503			383
Income tax expense	187			187			246
Net Income	$	300		$	316		$	137

See Notes to Consolidated Financial Statements

39

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Net income	$	300		$	316		$	137
Other comprehensive income (loss), net of tax:
Adjustment to pension and other postretirement plans (net of tax of $1, $1 and $5)	(1		)	(2		)	6
Other comprehensive income (loss)	(1		)	(2		)	6
Comprehensive income	$	299		$	314		$	143

See Notes to Consolidated Financial Statements

40

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

CONSOLIDATED BALANCE SHEETS

	December 31,
	2011		2012
	(in millions)
ASSETS
Current Assets:
Cash and cash equivalents	$	1	$	1
Accounts receivable, net	542		544
Accrued unbilled revenue	253		258
Accounts and notes receivable — affiliated companies	17		15
Inventory	273		228
Non-trading derivative assets	87		36
Taxes receivable	1		—
Deferred income tax assets	8		—
Prepaid expenses and other current assets	122		133
Total current assets	1,304		1,215
Property, Plant and Equipment, Net	7,030		7,901
Other Assets:
Goodwill	1,696		1,468
Non-trading derivative assets	20		6
Investment in unconsolidated affiliates	472		405
Other	165		195
Total other assets	2,353		2,074
Total Assets	$	10,687	$	11,190
LIABILITIES AND STOCKHOLDER’S EQUITY
Current Liabilities:
Short-term borrowings	$	62	$	38
Current portion of long-term debt	—		365
Accounts payable	427		443
Accounts and notes payable — affiliated companies	419		818
Taxes accrued	82		72
Interest accrued	48		48
Customer deposits	74		79
Non-trading derivative liabilities	46		14
Other	157		177
Total current liabilities	1,315		2,054
Other Liabilities:
Accumulated deferred income taxes, net	1,420		1,676
Non-trading derivative liabilities	6		2
Benefit obligations	108		122
Regulatory liabilities	597		619
Other	232		208
Total other liabilities	2,363		2,627
Long-Term Debt	2,919		2,276
Commitments and Contingencies (Note 12)
Stockholder’s Equity	4,090		4,233
Total Liabilities And Stockholder’s Equity	$	10,687	$	11,190

See Notes to Consolidated Financial Statements

41

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

STATEMENTS OF CONSOLIDATED CASH FLOWS

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Cash Flows from Operating Activities:
Net income	$	300		$	316		$	137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	248			262			285
Amortization of deferred financing costs	9			13			13
Deferred income taxes	208			144			245
Goodwill impairment	—			—			252
Step acquisition gain	—			—			(136		)
Write-down of natural gas inventory	6			11			4
Equity in earnings of unconsolidated affiliates, net of distributions	13			8			8
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net	120			67			6
Accounts receivable/payable, affiliates	6			(14		)	5
Inventory	(52		)	20			41
Taxes receivable	(16		)	62			1
Accounts payable	(35		)	(101		)	2
Fuel cost recovery	(9		)	(70		)	(52		)
Interest and taxes accrued	5			6			(11		)
Non-trading derivatives, net	(5		)	(10		)	19
Margin deposits, net	7			34			53
Other current assets	(20		)	11			(10		)
Other current liabilities	(14		)	(12		)	8
Other assets	(7		)	(3		)	(13		)
Other liabilities	(21		)	22			(28		)
Other, net	(21		)	3			7
Net cash provided by operating activities	722			769			836
Cash Flows from Investing Activities:
Capital expenditures, net of acquisitions	(917		)	(644		)	(566		)
Acquisitions, net of cash acquired	—			—			(360		)
Investment in unconsolidated affiliates	(18		)	(12		)	(5		)
Other, net	20			10			8
Net cash used in investing activities	(915		)	(646		)	(923		)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings, net	(2		)	9			(24		)
Proceeds from (payments of) commercial paper, net	183			102			(285		)
Proceeds from long-term debt	—			550			—
Payments of long-term debt	(45		)	(606		)	—
Cash paid for debt exchange	—			(58		)	—
Debt issuance costs	—			(14		)	—
Increase (decrease) in notes payable to affiliates	57			(106		)	396
Net cash provided by (used in) financing activities	193			(123		)	87
Net Decrease in Cash and Cash Equivalents	—			—			—
Cash and Cash Equivalents at Beginning of the Year	1			1			1
Cash and Cash Equivalents at End of the Year	$	1		$	1		$	1
Supplemental Disclosure of Cash Flow Information:
Cash Payments:
Interest, net of capitalized interest	$	191		$	177		$	163
Income taxes (refunds), net	141			(20		)	3
Non-cash transactions:
Accounts payable related to capital expenditures	$	98		$	53		$	60

See Notes to Consolidated Financial Statements

42

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

STATEMENTS OF CONSOLIDATED STOCKHOLDER’S EQUITY

	2010				2011				2012
	Shares	Amount			Shares	Amount			Shares	Amount
	(in millions, except share amounts)
Common Stock
Balance, beginning of year	1,000	$	—		1,000	$	—		1,000	$	—
Balance, end of year	1,000	—			1,000	—			1,000	—
Additional Paid-in-Capital
Balance, beginning of year		2,416				2,416				2,416
Balance, end of year		2,416				2,416				2,416
Retained Earnings
Balance, beginning of year		1,065				1,365				1,681
Net income		300				316				137
Balance, end of year		1,365				1,681				1,818
Accumulated Other Comprehensive Loss
Balance, end of year:
Adjustment to pension and postretirement plans		(5		)		(7		)		(1		)
Total accumulated other comprehensive loss, end of year		(5		)		(7		)		(1		)
Total Stockholder’s Equity		$	3,776			$	4,090			$	4,233

See Notes to Consolidated Financial Statements

43

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1)       Background

CenterPoint Energy Resources Corp. (CERC Corp., and, together with its subsidiaries, CERC), owns and operates natural gas distribution systems. Subsidiaries of CERC Corp. own interstate natural gas pipelines and gas gathering systems and provide various ancillary services. A wholly owned subsidiary of CERC offers variable and fixed-price physical natural gas supplies primarily to commercial and industrial customers and electric and gas utilities. CERC Corp. is a Delaware corporation.

CERC Corp. is an indirect wholly owned subsidiary of CenterPoint Energy, Inc. (CenterPoint Energy), a public utility holding company.

For a description of CERC's reportable business segments, see Note 14.

(2)       Summary of Significant Accounting Policies

(a) Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

(b) Principles of Consolidation

The accounts of CERC Corp. and its wholly owned and majority owned subsidiaries are included in CERC's consolidated financial statements. All intercompany transactions and balances are eliminated in consolidation. CERC uses the equity method of accounting for investments in entities in which CERC has an ownership interest between 20% and 50% and exercises significant influence.

CERC’s investments in unconsolidated affiliates include a 50% ownership interest in Southeast Supply Header, LLC (SESH), which owns and operates a 274-mile interstate natural gas pipeline.

Prior to July 2012, CERC owned a 50% interest in Waskom Gas Processing Company (Waskom), a Texas general partnership, which owns and operates a natural gas processing plant and natural gas gathering assets. During 2010, CERC invested $20 million in Waskom. On July 31, 2012, CERC purchased the 50% interest that it did not already own in Waskom, as well as other gathering and related assets from a third-party for approximately $273 million. The amount of the purchase price allocated to the acquisition of the 50% interest in Waskom was approximately $201 million, with the remaining purchase price allocated to the other gathering assets, based on a discounted cash flow methodology. The $273 million purchase price was allocated as follows: $253 million to property, plant and equipment; $16 million to goodwill; and the remaining balance to other assets and liabilities. The purchase of the 50% interest in Waskom was determined to be a business combination achieved in stages, and as such CERC recorded a pre-tax gain of approximately $136 million on July 31, 2012, which is the result of remeasuring CERC's original 50% interest in Waskom to fair value. As a result of the purchase, CERC recorded goodwill of $24 million, which includes $17 million related to Waskom (including the re-measurement of its existing 50% interest) and $7 million related to the other gathering and related assets.

Other investments, excluding marketable securities, are carried at cost.

(c) Revenues

CERC records revenue for natural gas sales and services under the accrual method and these revenues are recognized upon delivery to customers. Natural gas sales not billed by month-end are accrued based upon estimated purchased gas volumes, estimated lost and unaccounted for gas and currently effective tariff rates. The Interstate Pipelines and Field Services business segments record revenues as transportation and processing services are provided.

44

(d) Long-lived Assets and Intangibles

CERC records property, plant and equipment at historical cost. CERC expenses repair and maintenance costs as incurred. CERC periodically evaluates long-lived assets, including property, plant and equipment, and specifically identifiable intangibles, when events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. The determination of whether an impairment has occurred is based on an estimate of undiscounted cash flows attributable to the assets, compared to the carrying value of the assets.

(e) Regulatory Assets and Liabilities

CERC applies the guidance for accounting for regulated operations to the Natural Gas Distribution business segment and to portions of the Interstate Pipelines business segment. CERC’s rate-regulated businesses recognize removal costs as a component of depreciation expense in accordance with regulatory treatment. As of both December 31, 2011 and 2012, these removal costs of $573 million are classified as regulatory liabilities in the Consolidated Balance Sheets.  In addition, a portion of the amount of removal costs that relate to asset retirement obligations has been reclassified from a regulatory liability to an asset retirement liability in accordance with accounting guidance for conditional asset retirement obligations.

(f) Depreciation and Amortization Expense

Depreciation and amortization is computed using the straight-line method based on economic lives or regulatory-mandated recovery periods. Amortization expense includes amortization of regulatory assets and other intangibles.

(g) Capitalization of Interest and Allowance for Funds Used During Construction

Interest and allowance for funds used during construction (AFUDC) are capitalized as a component of projects under construction and are amortized over the assets’ estimated useful lives once the assets are placed in service. AFUDC represents the composite interest cost of borrowed funds and a reasonable return on the equity funds used for construction for subsidiaries that apply the guidance for accounting for regulated operations. During 2010, 2011 and 2012, CERC capitalized interest and AFUDC of $7 million, less than $1 million and $2 million, respectively.

(h) Income Taxes

CERC is included in the consolidated income tax returns of CenterPoint Energy. CERC calculates its income tax provision on a separate return basis under a tax sharing agreement with CenterPoint Energy. CERC uses the asset and liability method of accounting for deferred income taxes in accordance with accounting guidance for income taxes. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. A valuation allowance is established against deferred tax assets for which management believes realization is not considered to be more likely than not. Current federal and certain state income taxes are payable to or receivable from CenterPoint Energy. CERC recognizes interest and penalties as a component of income tax expense.

(i) Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are recorded at the invoiced amount and do not bear interest. It is the policy of management to review the outstanding accounts receivable monthly, as well as the bad debt write-offs experienced in the past, and establish an allowance for doubtful accounts. Account balances are charged off against the allowance when management determines it is probable the receivable will not be recovered. Accounts receivable are net of an allowance for doubtful accounts of $24 million and $23 million at December 31, 2011 and 2012, respectively. The provision for doubtful accounts in CERC’s Statements of Consolidated Income for 2010, 2011 and 2012 was $30 million, $25 million and $15 million, respectively.

45

(j) Inventory

Inventory consists principally of materials and supplies and natural gas. Materials and supplies are valued at the lower of average cost or market. Materials and supplies are recorded to inventory when purchased and subsequently charged to expense or capitalized to plant when installed. Natural gas inventories of CERC’s Competitive Natural Gas Sales and Services business segment are also primarily valued at the lower of average cost or market. Natural gas inventories of CERC’s Natural Gas Distribution business segment are primarily valued at weighted average cost.  During 2011 and 2012, CERC recorded $11 million and $4 million, respectively, in write-downs of natural gas inventory to the lower of average cost or market.

	December 31,
	2011		2012
	(in millions)
Materials and supplies	$	86	$	83
Natural gas	187		145
Total inventory	$	273	$	228

(k) Derivative Instruments

CERC is exposed to various market risks. These risks arise from transactions entered into in the normal course of business.  CERC utilizes derivative instruments such as physical forward contracts, swaps and options to mitigate the impact of changes in commodity prices and weather on its operating results and cash flows. Such derivatives are recognized in CERC's Consolidated Balance Sheets at their fair value unless CERC elects the normal purchase and sales exemption for qualified physical transactions. A derivative may be designated as a normal purchase or normal sale if the intent is to physically receive or deliver the product for use or sale in the normal course of business.

CenterPoint Energy has a Risk Oversight Committee composed of corporate and business segment officers that oversees all commodity price, weather and credit risk activities, including CERC's marketing, risk management services and hedging activities. The committee’s duties are to establish CERC's commodity risk policies, allocate board-approved commercial risk limits, approve use of new products and commodities, monitor positions and ensure compliance with CERC's risk management policies and procedures and limits established by CenterPoint Energy’s board of directors.

CERC's policies prohibit the use of leveraged financial instruments. A leveraged financial instrument, for this purpose, is a transaction involving a derivative whose financial impact will be based on an amount other than the notional amount or volume of the instrument.

(l) Environmental Costs

CERC expenses or capitalizes environmental expenditures, as appropriate, depending on their future economic benefit. CERC expenses amounts that relate to an existing condition caused by past operations that do not have future economic benefit. CERC records undiscounted liabilities related to these future costs when environmental assessments and/or remediation activities are probable and the costs can be reasonably estimated.

(m) Statements of Consolidated Cash Flows

For purposes of reporting cash flows, CERC considers cash equivalents to be short-term, highly-liquid investments with maturities of three months or less from the date of purchase.

(n) New Accounting Pronouncements

Management believes the impact of recently issued standards, which are not yet effective, will not have a material impact on CERC's consolidated financial position, results of operations or cash flows upon adoption.

(o) Other Current Assets and Liabilities

Included in other current assets on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $17 million and $12 million, respectively, of margin deposits and $63 million and $86 million, respectively of under-recovered gas cost. Included in other current liabilities on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $14 million and $6 million, respectively, of over-recovered gas cost.

46

(3)       Property, Plant and Equipment

(a) Property, Plant and Equipment

Property, plant and equipment includes the following:

	Weighted Average Useful Lives	December 31,
	(Years)	2011		2012
		(in millions)
Natural Gas Distribution	32	$	3,959	$	4,321
Competitive Natural Gas Sales and Services	26	76		80
Interstate Pipelines	56	2,675		2,803
Field Services	42	1,754		2,359
Other property	12	55		52
Total		8,519		9,615
Accumulated depreciation and amortization:
Natural Gas Distribution		1,069		1,194
Competitive Natural Gas Sales and Services		20		25
Interstate Pipelines		302		355
Field Services		72		118
Other property		26		22
Total accumulated depreciation and amortization		1,489		1,714
Property, plant and equipment, net		$	7,030	$	7,901

(b) Depreciation and Amortization

The following table presents depreciation and amortization expense for 2010, 2011 and 2012:

	Year Ended December 31,
	2010		2011		2012
	(in millions)
Depreciation expense	$	232	$	244	$	267
Amortization expense	16		18		18
Total depreciation and amortization expense	$	248	$	262	$	285

(c) Asset Retirement Obligations

A reconciliation of the changes in the asset retirement obligation (ARO) liability is as follows (in millions):

	December 31,
	2011		2012
Beginning balance	$	58	$	132
Accretion expense	3		6
Revisions in estimates of cash flows	71		(3		)
Ending balance	$	132	$	135

The increase of $71 million in the ARO from the revision of estimate in 2011 is primarily attributable to an increase in the disposal costs used in the cash flow assumptions. The decrease of $3 million in the ARO from the revision of estimate in 2012 is primarily attributable to a steel pipe replacement effort during 2012 which shifted the cost of removal obligation further into the future and lowered the current liability. There were no material additions or settlements during the years ended December 31, 2011 or 2012.

47

(4)       Goodwill

Goodwill by reportable business segment as of December 31, 2011 and 2012 is as follows (in millions):

	December 31, 2011		Impairment Charge		Acquisition		December 31, 2012
Natural Gas Distribution	$	746	$	—	$	—	$	746
Interstate Pipelines	579		—		—		579
Competitive Natural Gas Sales and Services	335		252		—		83
Field Services	25		—		24		49
Other Operations	11		—		—		11
Total	$	1,696	$	252	$	24	$	1,468

CERC performs its goodwill impairment tests at least annually and evaluates goodwill when events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. The impairment evaluation for goodwill is performed by using a two-step process. In the first step, the fair value of each reporting unit is compared with the carrying amount of the reporting unit, including goodwill. The estimated fair value of the reporting unit is generally determined on the basis of discounted future cash flows. If the estimated fair value of the reporting unit is less than the carrying amount of the reporting unit, then a second step must be completed in order to determine the amount of the goodwill impairment that should be recorded. In the second step, the implied fair value of the reporting unit’s goodwill is determined by allocating the reporting unit’s fair value to all of its assets and liabilities other than goodwill (including any unrecognized intangible assets) in a manner similar to a purchase price allocation. The resulting implied fair value of the goodwill that results from the application of this second step is then compared to the carrying amount of the goodwill and an impairment charge is recorded for the difference.

CERC performed its annual impairment test in the third quarter of 2012 and determined that a non-cash goodwill impairment charge in the amount of $252 million was required for the Competitive Natural Gas Sales and Services reportable segment. CERC also determined that no impairment charge was required for any other reportable segment.

CERC estimated the value of the Competitive Natural Gas Sales and Services reporting unit using an income approach. Under this approach, the fair value of the reporting unit is determined by using the present value of future expected cash flows, which cash flows are based on management projections of revenue growth, gross margin, and overall market conditions. These estimated future cash flows are then discounted using a rate that approximates the weighted average cost of capital of a market participant.

The Competitive Natural Gas Sales and Services reporting unit fair value analysis resulted in an implied fair value of goodwill of $83 million for this reporting unit, and as a result, a non-cash impairment charge in the amount of $252 million was recorded in the third quarter of 2012. The adverse wholesale market conditions facing CERC’s energy services business, specifically the prospects for continued low geographic and seasonal price differentials for natural gas, led to a reduction in the estimate of the fair value of goodwill associated with this reporting unit.

(5)       Regulatory Matters

The following is a list of regulatory assets/liabilities reflected on CERC's Consolidated Balance Sheets as of December 31, 2011 and 2012:

	December 31,
	2011			2012
	(in millions)
Regulatory assets in other long-term assets (1)	$	97		$	105
Regulatory liabilities	(597		)	(619		)
Net	$	(500	)	$	(514	)

________________

(1) Regulatory assets that are not earning a return were not material at December 31, 2011 and 2012.

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(6)       Employee Benefit Plans

(a) Pension Plans

Substantially all of CERC’s employees participate in CenterPoint Energy’s qualified non-contributory defined benefit pension plan. Under the cash balance formula, participants accumulate a retirement benefit based upon 5% of eligible earnings and accrued interest.

CenterPoint Energy’s funding policy is to review amounts annually in accordance with applicable regulations in order to achieve adequate funding of projected benefit obligations. Pension expense is allocated to CERC based on covered employees. This calculation is intended to allocate pension costs in the same manner as a separate employer plan. Assets of the plan are not segregated or restricted by CenterPoint Energy’s participating subsidiaries. CERC recognized pension expense of $34 million, $30 million and $32 million for the years ended December 31, 2010, 2011 and 2012, respectively.

In addition to the plan, CERC participates in CenterPoint Energy’s non-qualified benefit restoration plans, which allow participants to receive the benefits to which they would have been entitled under CenterPoint Energy’s non-contributory pension plan except for federally mandated limits on qualified plan benefits or on the level of compensation on which qualified plan benefits may be calculated. The expense associated with the non-qualified pension plan was $1 million, $2 million and $2 million for the years ended December 31, 2010, 2011 and 2012, respectively.

(b) Savings Plan

CERC participates in CenterPoint Energy’s qualified savings plan, which includes a cash or deferred arrangement under Section 401(k) of the Internal Revenue Code of 1986, as amended. Under the plan, participating employees may contribute a portion of their compensation, on a pre-tax or after-tax basis, generally up to a maximum of 50% of eligible compensation. CERC matches 100% of the first 6% of each employee’s compensation contributed. The matching contributions are fully vested at all times. CenterPoint Energy allocates to CERC the savings plan benefit expense related to CERC’s employees.  Savings plan benefit expense was $16 million, $17 million and $18 million for the years ended December 31, 2010, 2011, and 2012, respectively.

(c) Postretirement Benefits

CERC’s employees participate in CenterPoint Energy’s plans, which provide certain healthcare and life insurance benefits for retired employees on both a contributory and non-contributory basis. Employees become eligible for these benefits if they have met certain age and service requirements at retirement, as defined in the plans. Under plan amendments effective in early 1999, healthcare benefits for future retirees were changed to limit employer contributions for medical coverage. Such benefit costs are accrued over the active service period of employees. CERC is required to fund a portion of its obligations in accordance with rate orders. All other obligations are funded on a pay-as-you-go basis.

The net postretirement benefit cost includes the following components:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Service cost — benefits earned during the period	$	1		$	1		$	1
Interest cost on accumulated benefit obligation	7			6			5
Expected return on plan assets	(1		)	(1		)	(1		)
Amortization of prior service cost	2			2			2
Amortization of net loss	—			1			3
Net postretirement benefit cost	$	9		$	9		$	10

CERC used the following assumptions to determine net postretirement benefit costs:

	Year Ended December 31,
	2010		2011		2012
Discount rate	5.70	%	5.20	%	4.80	%
Expected return on plan assets	4.50	%	4.50	%	3.10	%

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In determining net periodic benefits cost, CERC uses fair value, as of the beginning of the year, as its basis for determining expected return on plan assets.

Following are reconciliations of CERC’s beginning and ending balances of its postretirement benefit plan’s benefit obligation, plan assets and funded status for 2011 and 2012. The measurement dates for plan assets and obligations were December 31, 2011 and 2012.

	December 31,
	2011			2012
	(in millions , except for actuarial assumptions)
Change in Benefit Obligation
Accumulated benefit obligation, beginning of year	$	112		$	118
Service cost	1			1
Interest cost	6			5
Benefits paid	(14		)	(13		)
Participant contributions	4			4
Medicare reimbursement	2			2
Early retiree reinsurance program reimbursement	1			—
Actuarial loss	6			16
Accumulated benefit obligation, end of year	$	118		$	133
Change in Plan Assets
Plan assets, beginning of year	$	22		$	22
Benefits paid	(14		)	(13		)
Employer contributions	9			9
Participant contributions	4			4
Actual investment return	1			2
Plan assets, end of year	$	22		$	24
Amounts Recognized in Balance Sheets
Current liabilities-other	$	(7	)	$	(7	)
Other liabilities-benefit obligations	(89		)	(102		)
Net liability, end of year	$	(96	)	$	(109	)
Actuarial Assumptions
Discount rate	4.80		%	3.90		%
Expected long-term return on assets	3.10		%	3.10		%
Healthcare cost trend rate assumed for the next year	8.00		%	9.00		%
Prescription cost trend rate assumed for the next year	8.00		%	9.00		%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50		%	5.50		%
Year that the healthcare rate reaches the ultimate trend rate	2017			2017
Year that the prescription drug rate reaches the ultimate trend rate	2017			2017

The discount rate assumption was determined by matching the accrued cash flows of CenterPoint Energy’s plans against a hypothetical yield curve of high-quality corporate bonds represented by a series of annualized individual discount rates from one-half to 99 years.

The expected rate of return assumption was developed by a weighted-average return analysis of the targeted asset allocation of CenterPoint Energy’s plans and the expected real return for each asset class, based on the long-term capital market assumptions, adjusted for investment fees and diversification effects, in addition to expected inflation.

For measurement purposes, healthcare and prescription costs are assumed to increase to 9.00% during 2013, after which this rate decreases until reaching the ultimate trend rate of 5.50% in 2017.

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Amounts recognized in accumulated other comprehensive loss consist of the following:

	December 31,
	2011			2012
	(in millions)
Unrecognized actuarial loss	$	28		$	20
Unrecognized prior service cost	4			2
Total recognized in accumulated other comprehensive loss	32			22
Less deferred tax benefit (1)	(25		)	(21		)
Net amount recognized in accumulated other comprehensive loss	$	7		$	1

________________

(1) CERC’s postretirement benefit obligation is reduced by the impact of previously non-taxable government subsidies under the Medicare Prescription Drug Act.  Because the subsidies were non-taxable, the temporary difference used in measuring the deferred tax impact was determined on the unrecognized losses excluding such subsidies.

The changes in plan assets and benefit obligations recognized in other comprehensive income during 2012 are as follows:

	Postretirement Benefits
	(in millions)
Net loss	$	(8	)
Amortization of prior service cost	(2		)
Total recognized in other comprehensive income	$	(10	)

The total expense recognized in net periodic costs and other comprehensive income was $-0- for postretirement benefits for the year ended December 31, 2012.

The amounts in accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost during 2013 are as follows:

	Postretirement Benefits
	(in millions)
Unrecognized actuarial loss	$	1
Unrecognized prior service cost	1
Amounts in accumulated other comprehensive loss to be recognized as net periodic cost	$	2

Assumed healthcare cost trend rates have a significant effect on the reported amounts for CERC’s postretirement benefit plans. A 1% change in the assumed healthcare cost trend rate would have the following effects:

	1% Increase		1% Decrease
	(in millions)
Effect on the postretirement benefit obligation	$	4	$	(3	)
Effect on the total of service and interest cost	—		—

In managing the investments associated with the postretirement benefit plan, CERC’s objective is to preserve and enhance the value of plan assets while maintaining an acceptable level of volatility. These objectives are expected to be achieved through an investment strategy that manages liquidity requirements while maintaining a long-term horizon in making investment decisions and efficient and effective management of plan assets.

51

As part of the investment strategy discussed above, CERC adopted and maintained the following asset allocation ranges for its postretirement benefit plan:

U.S. equity	15-25%
International equity	2-12%
Fixed income	68-78%
Cash	0-2%

The fair values of CERC’s postretirement plan assets at December 31, 2011 and 2012, by asset category are as follows:

	Fair Value Measurements at December 31, 2011 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	22	$	22	$	—	$	—
Total	$	22	$	22	$	—	$	—

________________

(1) 72% of the amount invested in mutual funds was in fixed income securities; 22% was in U.S. equities and 6% was in international equities.

	Fair Value Measurements at December 31, 2012 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	24	$	24	$	—	$	—
Total	$	24	$	24	$	—	$	—

 ________________

(1) 70% of the amount invested in mutual funds was in fixed income securities; 23% was in U.S. equities and 7% was in international equities.

CERC expects to contribute $8 million to its postretirement benefits plan in 2013. The following benefit payments are expected to be made by the postretirement benefit plan:

	Postretirement Benefit Plan
	Benefit Payments		Medicare Subsidy Receipts
	(in millions)
2013	$	11	$	(2	)
2014	11		(2		)
2015	11		(2		)
2016	12		(2		)
2017	12		(2		)
2018-2022	64		(16		)

(d) Postemployment Benefits

CERC participates in CenterPoint Energy’s plan that provides postemployment benefits for former or inactive employees, their beneficiaries and covered dependents, after employment but before retirement (primarily healthcare and life insurance benefits for participants in the long-term disability plan). CERC recorded postemployment benefit income of $1 million, expense of $4 million and expense of $5 million for the years ended December 31, 2010, 2011 and 2012, respectively. Amounts relating to postemployment benefits included in “Benefit Obligations” in the accompanying Consolidated Balance Sheets at December 31, 2011 and 2012, were $12 million and $14 million, respectively.

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(e) Other Non-Qualified Plans

CERC participates in CenterPoint Energy’s deferred compensation plans that provide benefits payable to directors, officers and certain key employees or their designated beneficiaries at specified future dates, upon termination, retirement or death. Benefit payments are made from the general assets of CERC. During 2010, 2011 and 2012, the benefit expense relating to these plans was less than $1 million each year. Amounts relating to deferred compensation plans included in “Benefit Obligations” in the accompanying Consolidated Balance Sheets at December 31, 2011 and 2012 were $3 million and $2 million, respectively.

(f) Other Employee Matters

As of December 31, 2012, approximately 28% of CERC's employees were covered by collective bargaining agreements. 

(7)       Related Party Transactions

CERC participates in a “money pool” through which it can borrow or invest on a short-term basis. Funding needs are aggregated and external borrowing or investing is based on the net cash position. The net funding requirements of the money pool are expected to be met with borrowings under CenterPoint Energy’s revolving credit facility or the sale of CenterPoint Energy’s commercial paper. CERC had money pool borrowings of $383 million and $779 million at December 31, 2011 and 2012, respectively, which are included in accounts and notes payable —affiliated companies in the Consolidated Balance Sheets.  At December 31, 2012, CERC’s money pool borrowings had a weighted-average interest rate of 0.1%.

CERC had net interest expense related to affiliate borrowings of $2 million, less than $1 million and $4 million for the years ended December 31, 2010, 2011 and 2012, respectively.

CenterPoint Energy provides some corporate services to CERC. The costs of services have been charged directly to CERC using methods that management believes are reasonable. These methods include negotiated usage rates, dedicated asset assignment and proportionate corporate formulas based on operating expenses, assets, gross margin, employees and a composite of assets, gross margin and employees. These charges are not necessarily indicative of what would have been incurred had CERC not been an affiliate of CenterPoint Energy. Amounts charged to CERC for these services were $154 million, $164 million and $163 million for 2010, 2011 and 2012, respectively, and are included primarily in operation and maintenance expenses.

No dividends were paid to the parent in 2010, 2011 and 2012.

(8)       Derivative Instruments

CERC is exposed to various market risks. These risks arise from transactions entered into in the normal course of business. CERC utilizes derivative instruments such as physical forward contracts, swaps and options to mitigate the impact of changes in commodity prices, weather and interest rates on its operating results and cash flows.

(a) Non-Trading Activities

Derivative Instruments. CERC enters into certain derivative instruments to manage physical commodity price risks and does not engage in proprietary or speculative commodity trading.  These financial instruments do not qualify or are not designated as cash flow or fair value hedges.

During the year ended December 31, 2010, CERC recorded increased natural gas revenues from unrealized net gains of $18 million and increased natural gas expense from unrealized net losses of $14 million, a net unrealized gain of $4 million. During the year ended December 31, 2011, CERC recorded increased natural gas revenues from unrealized net gains of $38 million and increased natural gas expense from unrealized net losses of $30 million, a net unrealized gain of $8 million. During the year ended December 31, 2012, CERC recorded decreased natural gas revenues from unrealized net losses of $68 million and decreased natural gas expense from unrealized net gains of $52 million, a net unrealized loss of $16 million.

Weather Hedges. CERC has weather normalization or other rate mechanisms that mitigate the impact of weather on its gas operations in Arkansas, Louisiana, Mississippi, Oklahoma and a portion of Texas. The remaining Gas Operations jurisdictions do not have such mechanisms. As a result, fluctuations from normal weather may have a significant positive or negative effect on the results of the gas operations in the remaining jurisdictions. CERC enters into heating-degree day swaps to mitigate the effect of fluctuations from normal weather on its financial position and cash flows for the respective winter heating seasons.  The swaps were

53

based on ten-year normal weather. During the years ended December 31, 2010, 2011 and 2012, CERC recognized losses of $-0-, losses of less than $1 million and gains of $8 million, respectively, related to these swaps. The 2011/2012 winter weather hedge had a maximum payment limit of $11 million. Due to the warmer than normal weather, the maximum was reached by February 2012. Weather hedge gains and losses are included in revenues in the Statements of Consolidated Income.

(b) Derivative Fair Values and Income Statement Impacts

The following tables present information about CERC’s derivative instruments and hedging activities. The first two tables provide a balance sheet overview of CERC’s Derivative Assets and Liabilities as of December 31, 2011 and 2012, while the last table provides a breakdown of the related income statement impacts for the years ending December 31, 2011 and 2012.

Fair Value of Derivative Instruments
	December 31, 2011
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	88	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	20		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	15		110
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	—		13
Total		$	123	$	124

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 633 billion cubic feet (Bcf) or a net 84 Bcf long position.  Of the net long position, basis swaps constitute 74 Bcf and volumes associated with price stabilization activities of the Natural Gas Distribution business segment constitute 6 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $55 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $56 million.

Fair Value of Derivative Instruments
	December 31, 2012
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	37	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	6		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	5		27
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	1		4
Total		$	49	$	32

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 489 Bcf or a net 101 Bcf long position.  Of the net long position, basis swaps constitute 73 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $26 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $9 million.

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For CERC’s price stabilization activities of the Natural Gas Distribution business segment, the settled costs of derivatives are ultimately recovered through purchased gas adjustments. Accordingly, the net unrealized gains and losses associated with these contracts are recorded as net regulatory assets. Realized and unrealized gains and losses on other derivatives are recognized in the Statements of Consolidated Income as revenue for retail sales derivative contracts and as natural gas expense for financial natural gas derivatives and non-retail related physical natural gas derivatives.

Income Statement Impact of Derivative Activity
		Year Ended December 31,
Total derivatives not designated as hedging instruments	Income Statement Location	2011			2012
		(in millions)
Natural gas derivatives	Gains (Losses) in Revenue	$	102		$	43
Natural gas derivatives (1)	Gains (Losses) in Expense: Natural Gas	(144		)	(63		)
Total		$	(42	)	$	(20	)

 ________________

(1) The Gains (Losses) in Expense: Natural Gas includes $(107) million and $(38) million of costs in 2011 and 2012, respectively, associated with price stabilization activities of the Natural Gas Distribution business segment that will be ultimately recovered through purchased gas adjustments.

(c) Credit Risk Contingent Features

CERC enters into financial derivative contracts containing material adverse change provisions.  These provisions could require CERC to post additional collateral if the Standard & Poor’s Ratings Services or Moody’s Investors Service, Inc. credit ratings of CERC are downgraded.  The total fair value of the derivative instruments that contain credit risk contingent features that are in a net liability position at December 31, 2011 and 2012 was $39 million and $5 million, respectively.  The aggregate fair value of assets that are already posted as collateral was less than $1 million at both December 31, 2011 and 2012.  If all derivative contracts (in a net liability position) containing credit risk contingent features were triggered at December 31, 2011 and 2012, $38 million and $5 million, respectively, of additional assets would be required to be posted as collateral.

(d) Credit Quality of Counterparties

In addition to the risk associated with price movements, credit risk is also inherent in CERC’s non-trading derivative activities. Credit risk relates to the risk of loss resulting from non-performance of contractual obligations by a counterparty. The following table shows the composition of counterparties to the non-trading derivative assets of CERC as of December 31, 2011 and 2012 (in millions):

	December 31, 2011				December 31, 2012
	Investment Grade(1)		Total		Investment Grade(1)		Total
Energy marketers	$	1	$	7	$	1	$	1
Financial institutions	—		—		—		—
Retail end users (2)	—		100		—		41
Total	$	1	$	107	$	1	$	42

 ________________

(1) “Investment grade” is primarily determined using publicly available credit ratings and considering credit support (such as parent company guaranties) and collateral, which encompass cash and standby letters of credit. For unrated counterparties, CERC determines a synthetic credit rating by performing financial statement analysis and considering contractual rights and restrictions and collateral.

(2) Retail end users represent customers who have contracted to fix the price of a portion of their physical gas requirements for future periods.

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(9)       Fair Value Measurements

Assets and liabilities are recorded at fair value in the Consolidated Balance Sheets and are categorized based upon the level of judgment associated with the inputs used to measure their value. Hierarchical levels, as defined below and directly related to the amount of subjectivity associated with the inputs to fair valuations of these assets and liabilities, are as follows:

Level 1: Inputs are unadjusted quoted prices in active markets for identical assets or liabilities at the measurement date. The types of assets carried at Level 1 fair value generally are exchange-traded derivatives and equity securities.

Level 2: Inputs, other than quoted prices included in Level 1, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar instruments in active markets, and inputs other than quoted prices that are observable for the asset or liability. Fair value assets and liabilities that are generally included in this category are derivatives with fair values based on inputs from actively quoted markets.  A market approach is utilized to value CERC’s Level 2 assets or liabilities.

Level 3: Inputs are unobservable for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. Unobservable inputs reflect CERC’s judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. CERC develops these inputs based on the best information available, including CERC’s own data. A market approach is utilized to value CERC’s Level 3 assets or liabilities. Currently, CERC’s Level 3 assets and liabilities are comprised of physical forward contracts and options. Level 3 physical forward contracts are valued using a discounted cash flow model which includes illiquid forward price curve locations (ranging from $3.07-$4.79 per one million British thermal units (Btu)) as an unobservable input. Level 3 options are valued through Black-Scholes (including forward start) option models which include option volatilities (ranging from 0-58%) as an unobservable input.  CERC’s Level 3 derivative assets and liabilities consist of both long and short positions (forwards and options) and their fair value is sensitive to forward prices and volatilities.  If forward prices decrease, CERC’s long forwards lose value whereas its short forwards gain in value.  If volatility decreases, CERC’s long options lose value whereas its short options gain in value. Instruments classified as Level 3 include the revaluation of the Competitive Natural Gas Sales and Services reporting unit (See Note 4).

CERC determines the appropriate level for each financial asset and liability on a quarterly basis and recognizes transfers between levels at the end of the reporting period.  For the year ended December 31, 2012, there were no transfers between Level 1 and 2 with regard to Natural Gas derivatives. CERC also recognizes purchases of Level 3 financial assets and liabilities at their fair market value at the end of the reporting period.

The following tables present information about CERC’s assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of December 31, 2011 and 2012, and indicate the fair value hierarchy of the valuation techniques utilized by CERC to determine such fair value.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2011
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		112		10		(16		)	107
Total assets	$	13	$	112	$	10	$	(16	)	$	119
Liabilities
Natural gas derivatives	$	19	$	101	$	4	$	(72	)	$	52
Total liabilities	$	19	$	101	$	4	$	(72	)	$	52

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $56 million posted with the same counterparties.

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	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2012
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		40		7		(6		)	42
Total assets	$	13	$	40	$	7	$	(6	)	$	54
Liabilities
Natural gas derivatives	$	5	$	21	$	5	$	(15	)	$	16
Total liabilities	$	5	$	21	$	5	$	(15	)	$	16

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $9 million posted with the same counterparties.

The following tables present additional information about assets or liabilities, including derivatives that are measured at fair value on a recurring basis for which CERC has utilized Level 3 inputs to determine fair value:

	Fair Value Measurements Using Significant  Unobservable Inputs (Level 3)
	Derivative assets and liabilities, net
	Year Ended December 31,
	2010			2011			2012
	(in millions)
Beginning balance	$	(6	)	$	3		$	6
Total gains or (losses):
Included in earnings	4			6			3
Included in regulatory assets	(1		)	—			—
Total settlements:
Included in earnings	(2		)	(3		)	(6		)
Included in regulatory assets	8			—			—
Total purchases	—			2			—
Transfers out of Level 3(1)	—			(2		)	(1		)
Ending balance	$	3		$	6		$	2
The amount of total gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$	4		$	5		$	1

________

(1) During 2010, 2011 and 2012, CERC did not have material Level 3 sales or significant transfers into Level 3.

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Estimated Fair Value of Financial Instruments

The fair values of cash and cash equivalents and short-term borrowings are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below. Non-trading derivative assets and liabilities are stated at fair value and are excluded from the table below. The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by the market price.

	December 31, 2011				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions)
Financial liabilities:
Long-term debt	$	2,919	$	3,272	$	2,641	$	3,094

(10)           Short-term Borrowings and Long-term Debt

	December 31, 2011					December 31, 2012
	Long-Term			Current(1)		Long-Term			Current(1)
	(in millions)
Short-term borrowings:
Inventory financing	$	—		$	62	$	—		$	38
Total short-term borrowings	—			62		—			38
Long-term debt:
Senior notes 4.50% to 7.875% due 2013 to 2041	2,693			—		2,328			365
Commercial paper (2)	285			—		—			—
Unamortized discount and premium	(59		)	—		(52		)	—
Total long-term debt	2,919			—		2,276			365
Total debt	$	2,919		$	62	$	2,276		$	403

________________

(1) Includes amounts due or exchangeable within one year of the date noted.

(2) Classified as long-term debt because the termination date of the facility that backstops the commercial paper is more than one year from the date noted.

(a)Short-term Borrowings

Inventory Financing. Gas Operations has asset management agreements associated with its utility distribution service in Arkansas, north Louisiana and Oklahoma that extend through 2015. Pursuant to the provisions of the agreements, Gas Operations sells natural gas and agrees to repurchase an equivalent amount of natural gas during the winter heating seasons at the same cost, plus a financing charge. These transactions are accounted for as a financing and they had an associated principal obligation of $62 million and $38 million as of December 31, 2011 and 2012, respectively.

(b) Long-term Debt

Revolving Credit Facility.   As of December 31, 2011 and 2012, CERC had the following revolving credit facility and utilization of such facility (in millions):

December 31, 2011								December 31, 2012
Size of Facility		Loans		Letters of Credit		Commercial Paper		Size of Facility		Loans		Letters of Credit		Commercial Paper
$	950	$	—	$	—	$	285	$	950	$	—	$	—	$	—

CERC Corp.’s $950 million credit facility, which is scheduled to terminate September 9, 2016, can be drawn at the London Interbank Offered Rate plus 150 basis points based on CERC Corp.’s current credit ratings. The facility contains a debt to total

58

capitalization covenant, limiting debt to 65% of its total capitalization. CERC Corp. was in compliance with all debt covenants as of December 31, 2012.

Maturities.  CERC’s consolidated maturities of long-term debt are $365 million in 2013, $160 million in 2014, $-0- in 2015, $325 million in 2016 and $250 million in 2017.

(11)           Income Taxes

The components of CERC’s income tax expense were as follows:

	Year Ended December 31,
	2010			2011		2012
	(in millions)
Current income tax expense (benefit):
Federal	$	(38	)	$	34	$	—
State	17			9		1
Total current expense (benefit)	(21		)	43		1
Deferred income tax expense (benefit):
Federal	234			140		198
State	(26		)	4		47
Total deferred expense	208			144		245
Total income tax expense	$	187		$	187	$	246

A reconciliation of the expected federal income tax expense using the federal statutory income tax rate to the actual income tax expense and resulting effective income tax rate is as follows:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Income before income taxes	$	487		$	503		$	383
Federal statutory income tax rate	35		%	35		%	35		%
Expected federal income tax expense	170			176			134
Increase (decrease) in tax expense resulting from:
State income tax expense (benefit), net of federal income tax	(6		)	9			31
Increase (decrease) in settled and uncertain income tax positions	5			1			(7		)
Tax law change in deductibility of retiree health care costs	18			—			—
Goodwill impairment	—			—			88
Other, net	—			1			—
Total	17			11			112
Total income tax expense	$	187		$	187		$	246
Effective tax rate	38.4		%	37.2		%	64.2		%

CERC recorded an effective tax rate of 64.2% for 2012 compared to 37.2% for 2011. The increase in the effective tax rate is primarily due to the goodwill impairment of $252 million which is non-deductible for tax in 2012 and higher state tax expense compared to 2011 related to benefits recognized in that prior period for lower blended state rates. The increased rate was partially offset by the release of income tax reserves of $7 million.

CERC recorded a net reduction in state income tax expense of approximately $20 million related to lower blended state tax rates and a reduction of the deferred tax liability recorded in December 2011.

CERC recorded a non-cash, $19 million increase to income tax expense in 2010 as a result of a change in tax law upon the enactment in March 2010 of the Patient Protection and Affordable Care Act and the related Health Care and Education Reconciliation Act of 2010. The change in tax law, which becomes effective for tax years beginning after December 31, 2012, eliminates the tax deductibility of the portion of retiree health care costs that are reimbursed by Medicare Part D subsidies. Based upon the actuarially determined net present value of lost future retiree health care deductions related to the subsidies, CERC reduced its deferred tax asset

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by approximately $22 million in March 2010. The portion of the reduction that CERC believes will be recovered through the regulatory process, or approximately $2 million, was recorded as an adjustment to regulatory assets. The regulatory assets were also increased in March 2010 by approximately $1 million related to the recovery of CERC’s income taxes. The remaining $19 million of the reduction in CERC’s deferred tax asset was recorded as a charge to income tax expense in the first quarter of 2010.

In December 2010, certain subsidiaries of CERC were restructured in order to achieve a more tax-efficient reporting structure. As a result of the restructuring, CERC recorded a net reduction in income tax expense of approximately $24 million related to the remeasurement of accumulated deferred income taxes. The net reduction in income tax expense is comprised of a decrease in state income tax expense, net of federal income tax, totaling approximately $29 million and an increase in income tax expense of approximately $5 million related to uncertain income tax positions.

The tax effects of temporary differences that give rise to significant portions of deferred tax assets and liabilities were as follows:

	December 31,
	2011			2012
	(in millions)
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	9		$	9
Other	(1		)	—
Total current deferred tax assets	8			9
Non-current:
Employee benefits	57			49
Loss and credit carryforwards	238			192
Regulatory liabilities, net	—			196
Other	60			51
Total non-current deferred tax assets before valuation allowance	355			488
Valuation allowance	(3		)	(2		)
Total non-current deferred tax assets, net of valuation allowance	352			486
Total deferred tax assets, net of valuation allowance	360			495
Deferred tax liabilities:
Current:
Deferred gas costs	—			25
Other	—			5
Total current deferred tax liabilities	—			30
Non-current:
Depreciation	1,696			2,033
Regulatory assets, net	17			—
Other	59			129
Total non-current deferred tax liabilities	1,772			2,162
Total deferred tax liabilities	1,772			2,192
Accumulated deferred income taxes, net	$	1,412		$	1,697

CERC is included in the consolidated income tax returns of CenterPoint Energy. CERC calculates its income tax provision on a separate return basis under a tax sharing agreement with CenterPoint Energy.

Tax Attribute Carryforwards and Valuation Allowance.  At December 31, 2012, CERC has approximately $487 million of federal net operating loss carryforwards which begin to expire in 2031 and approximately $377 million of state net operating loss carryforwards which expire in various years between 2013 and 2032. CERC has approximately $1 million of federal capital loss carryforwards and $1 million of federal charitable contribution carryforwards which expire in various years between 2013 and 2032.

CERC has approximately $244 million of state capital loss carryforwards which expire in 2017 for which management established a full valuation allowance of $3 million state tax effect ($2 million net of federal income tax). The valuation allowance was established based upon management's evaluation that it may not be realized.

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Uncertain Income Tax Positions. The following table reconciles the beginning and ending balance of CERC’s unrecognized tax benefits (expenses):

	December 31,
	2010			2011			2012
	(in millions)
Balance, beginning of year	$	6		$	11		$	8
Tax Positions related to prior years:
Additions	—			(1		)	—
Reductions	(2		)	(3		)	(27		)
Tax Positions related to current year:
Additions	7			1			—
Settlements	—			—			(1		)
Balance, end of year	$	11		$	8		$	(20	)

The net decrease in the total amount of unrecognized tax benefits during 2012 is primarily related to the re-measurement of certain unrecognized tax benefits related to an Internal Revenue Service (IRS) issuance of new guidance with respect to repairs on tangible property and CERC's IRS settlements for tax years 2006 through 2009. CERC does not expect the change to the amount of unrecognized tax benefits over the twelve months ending December 31, 2013 to materially impact the financial position of CERC.

CERC had approximately $5 million, $6 million and $-0- of unrecognized tax benefits that, if recognized, would affect the effective income tax rate for 2010, 2011and 2012, respectively. CERC recognizes interest and penalties as a component of income tax expense.  CERC recognized approximately $0.4 million of income tax expense, $0.4 million of income tax expense and $3 million of income tax benefit related to interest on uncertain income tax positions during 2010, 2011 and 2012, respectively. CERC had approximately $4 million and $7 million of interest receivable on uncertain income tax positions accrued at December 31, 2011 and 2012, respectively.

Tax Audits and Settlements.   CenterPoint Energy's consolidated federal income tax returns have been audited and settled through the 2009 tax year. CenterPoint Energy has filed claims for income tax refunds that are pending review by the IRS for tax years 2002, 2003 and 2004. CenterPoint Energy is currently under examination by the IRS for tax years 2010 and 2011 and is at various stages of the examination process. CERC has considered the effects of these examinations in its accrual for settled issues and liability for uncertain income tax positions as of December 31, 2012.

(12)           Commitments and Contingencies

(a) Natural Gas Supply Commitments

Natural gas supply commitments include natural gas contracts related to CERC’s Natural Gas Distribution and Competitive Natural Gas Sales and Services business segments, which have various quantity requirements and durations, that are not classified as non-trading derivative assets and liabilities in CERC’s Consolidated Balance Sheets as of December 31, 2011 and 2012 as these contracts meet the exception to be classified as "normal purchases contracts" or do not meet the definition of a derivative. Natural gas supply commitments also include natural gas transportation contracts that do not meet the definition of a derivative. As of December 31, 2012, minimum payment obligations for natural gas supply commitments are approximately $430 million in 2013, $344 million in 2014, $214 million in 2015, $149 million in 2016, $96 million in 2017 and $156 million after 2017.

(b) Asset Management Agreements

Gas Operations has asset management agreements associated with its utility distribution service in Arkansas, Louisiana, Mississippi, Oklahoma and Texas. Generally, these asset management agreements are contracts between Gas Operations and an asset manager that are intended to transfer the working capital obligation and maximize the utilization of the assets.  In these agreements, Gas Operations agreed to release transportation and storage capacity to other parties to manage gas storage, supply and delivery arrangements for Gas Operations and to use the released capacity for other purposes when it is not needed for Gas Operations. Gas Operations is compensated by the asset manager through payments made over the life of the agreements based in part on the results of the asset optimization. Under the provisions of these asset management agreements, Gas Operations has an obligation to purchase its winter storage requirements from the asset manager. The agreements have varying terms, the longest of which expires in 2016.

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(c) Lease Commitments

The following table sets forth information concerning CERC’s obligations under non-cancelable long-term operating leases at December 31, 2012, which primarily consist of rental agreements for building space, data processing equipment, compression equipment and rights of way (in millions):

2013	$	12
2014	8
2015	5
2016	5
2017	3
2018 and beyond	13
Total	$	46

Total lease expense for all operating leases was $76 million, $42 million and $26 million in 2010, 2011 and 2012, respectively.

(d) Long-Term Gas Gathering and Treating Agreements

CenterPoint Energy Field Services, LLC (CEFS) has long-term agreements with an indirect wholly owned subsidiary of Encana Corporation (Encana) and an indirect wholly owned subsidiary of Royal Dutch Shell plc (Shell) to provide gathering and treating services for their natural gas production from certain Haynesville Shale and Bossier Shale formations in Texas and Louisiana.  

Under the long-term agreements, Encana or Shell may elect to require CEFS to expand the capacity of its gathering systems by up to an additional 1.3 Bcf per day.  CEFS estimates that the cost to expand the capacity of its gathering systems by an additional 1.3 Bcf per day would be as much as $440 million.  Encana and Shell would provide incremental volume commitments in connection with an election to expand system capacity.

(e) Legal, Environmental and Other Regulatory Matters

Legal Matters

Gas Market Manipulation Cases.  CenterPoint Energy, CenterPoint Houston or their predecessor, Reliant Energy, Incorporated (Reliant Energy), and certain of their former subsidiaries have been named as defendants in certain lawsuits described below. Under a master separation agreement between CenterPoint Energy and a former subsidiary, RRI Energy, Inc. (RRI), CenterPoint Energy and its subsidiaries are entitled to be indemnified by RRI and its successors for any losses, including attorneys’ fees and other costs, arising out of these lawsuits.  In May 2009, RRI sold its Texas retail business to a subsidiary of NRG Energy, Inc. (NRG) and RRI changed its name to RRI Energy, Inc. In December 2010, Mirant Corporation merged with and became a wholly owned subsidiary of RRI, and RRI changed its name to GenOn Energy, Inc. (GenOn). In December 2012, NRG acquired GenOn through a merger in which GenOn became a wholly owned subsidiary of NRG. None of the sale of the retail business, the merger with Mirant Corporation, or the acquisition of GenOn by NRG alters RRI’s (now GenOn’s) contractual obligations to indemnify CenterPoint Energy and its subsidiaries, including CenterPoint Houston, for certain liabilities, including their indemnification obligations regarding the gas market manipulation litigation, nor does it affect the terms of existing guaranty arrangements for certain GenOn gas transportation contracts discussed below.

A large number of lawsuits were filed against numerous gas market participants in a number of federal and western state courts in connection with the operation of the natural gas markets in 2000-2002. CenterPoint Energy’s former affiliate, RRI, was a participant in gas trading in the California and Western markets. These lawsuits, many of which were filed as class actions, allege violations of state and federal antitrust laws. Plaintiffs in these lawsuits are seeking a variety of forms of relief, including, among others, recovery of compensatory damages (in some cases in excess of $1 billion), a trebling of compensatory damages, full consideration damages and attorneys’ fees. CenterPoint Energy and/or Reliant Energy were named in approximately 30 of these lawsuits, which were instituted between 2003 and 2009. CenterPoint Energy and its affiliates have since been released or dismissed from all but two of such cases. CenterPoint Energy Services, Inc. (CES), a subsidiary of CERC Corp., is a defendant in a case now pending in federal court in Nevada alleging a conspiracy to inflate Wisconsin natural gas prices in 2000-2002.  In July 2011, the court issued an order dismissing the plaintiffs’ claims against the other defendants in the case, each of whom had demonstrated FERC jurisdictional sales for resale during the relevant period, based on federal preemption.  The plaintiffs have appealed this ruling to the United States Court

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of Appeals for the Ninth Circuit. Additionally, CenterPoint Energy was a defendant in a lawsuit filed in state court in Nevada that was dismissed in 2007, but in March 2010 the plaintiffs appealed the dismissal to the Nevada Supreme Court. In September 2012, the Nevada Supreme Court affirmed the dismissal. In October 2012, the Nevada Supreme Court granted the plaintiffs’ motion to stay the dismissal of this case pending the filing and final disposition of their petition for a writ of certiorari to the Supreme Court of the United States. In December 2012, the plaintiffs filed a petition for writ of certiorari with the Supreme Court of the United States. On January 4, 2013, the Supreme Court removed the case from its docket since the plaintiffs’ petition exceeded the applicable word limit. In February 2013, the plaintiffs filed a corrected petition with the Supreme Court. CenterPoint Energy believes that neither it nor CES is a proper defendant in these remaining cases and will continue to pursue dismissal from those cases.  CenterPoint Energy does not expect the ultimate outcome of these remaining matters to have a material impact on its financial condition, results of operations or cash flows.

Natural Gas Measurement Lawsuits. CERC Corp. and certain of its subsidiaries are defendants in two mismeasurement lawsuits brought against approximately 245 pipeline companies and their affiliates pending in state court in Stevens County, Kansas.  In one case (originally filed in May 1999 and amended four times), the plaintiffs purport to represent a class of royalty owners who allege that the defendants have engaged in systematic mismeasurement of the volume of natural gas for more than 25 years. The plaintiffs amended their petition in this suit in July 2003 in response to an order from the judge denying certification of the plaintiffs’ alleged class. In the amendment, the plaintiffs dismissed their claims against certain defendants (including two CERC Corp. subsidiaries), limited the scope of the class of plaintiffs they purport to represent and eliminated previously asserted claims based on mismeasurement of the Btu content of the gas. The same plaintiffs then filed a second lawsuit, again as representatives of a putative class of royalty owners in which they assert their claims that the defendants have engaged in systematic mismeasurement of the Btu content of natural gas for more than 25 years. In both lawsuits, the plaintiffs seek compensatory damages, along with statutory penalties, treble damages, interest, costs and fees.  In September 2009, the district court in Stevens County, Kansas, denied plaintiffs’ request for class certification of their case and, in March 2010, denied the plaintiffs’ request for reconsideration of that order.   In July 2012, the plaintiffs filed a motion to dismiss certain defendants from both lawsuits, including the remaining CERC Corp. defendants.

CERC believes that there has been no systematic mismeasurement of gas and that these lawsuits are without merit. CERC does not expect the ultimate outcome of the lawsuits to have a material impact on its financial condition, results of operations or cash flows.

Environmental Matters

Manufactured Gas Plant Sites. CERC and its predecessors operated manufactured gas plants (MGPs) in the past. In Minnesota, CERC has completed remediation on two sites, other than ongoing monitoring and water treatment. There are five remaining sites in CERC’s Minnesota service territory. CERC believes that it has no liability with respect to two of these sites.

As of December 31, 2012, CERC had recorded a liability of $14 million for remediation of these Minnesota sites. The estimated range of possible remediation costs for the sites CERC believes it has responsibility for was $6 million to $41 million based on remediation continuing for 30 to 50 years. The cost estimates are based on studies of a site or industry average costs for remediation of sites of similar size. The actual remediation costs will be dependent upon the number of sites to be remediated, the participation of other potentially responsible parties (PRPs), if any, and the remediation methods used. The Minnesota Public Utilities Commission includes approximately $285,000 annually in rates to fund normal on-going remediation costs.  As of December 31, 2012, CERC had collected $5.8 million from insurance companies to be used for future environmental remediation.

In addition to the Minnesota sites, the United States Environmental Protection Agency and other regulators have investigated MGP sites that were owned or operated by CERC or may have been owned by one of its former affiliates. CERC does not expect the ultimate outcome of these investigations will have a material adverse impact on the financial condition, results of operations or cash flows.

Asbestos.  Some facilities owned by CERC's predecessors contain or have contained asbestos insulation and other asbestos-containing materials. CERC or its predecessor companies have been named, along with numerous others, as a defendant in lawsuits filed by a number of individuals who claim injury due to exposure to asbestos. Some of the claimants have worked at locations owned by CERC, but most existing claims relate to facilities previously owned by CERC's subsidiaries. CERC anticipates that additional claims like those received may be asserted in the future.  Although their ultimate outcome cannot be predicted at this time, CERC intends to continue vigorously contesting claims that it does not consider to have merit and, based on its experience to date, does not expect these matters, either individually or in the aggregate, to have a material adverse effect on its financial condition, results of operations or cash flows.

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Other Environmental.  From time to time CERC identifies the presence of environmental contaminants on property where it conducts or has conducted operations. Other such sites involving contaminants may be identified in the future.  CERC has remediated and expects to continue to remediate identified sites consistent with its legal obligations. From time to time CERC has received notices from regulatory authorities or others regarding its status as a PRP in connection with sites found to require remediation due to the presence of environmental contaminants. In addition, CERC has been named from time to time as a defendant in litigation related to such sites. Although the ultimate outcome of such matters cannot be predicted at this time, CERC does not expect, based on its experience to date, these matters, either individually or in the aggregate, to have a material adverse effect on its financial condition, results of operations or cash flows.

Other Proceedings

CERC is involved in other legal, environmental, tax and regulatory proceedings before various courts, regulatory commissions and governmental agencies regarding matters arising in the ordinary course of business. Some of these proceedings involve substantial amounts. CERC regularly analyzes current information and, as necessary, provides accruals for probable liabilities on the eventual disposition of these matters. CERC does not expect the disposition of these matters to have a material adverse effect on its financial condition, results of operations or cash flows.

(f) Guaranties

Prior to the distribution of CenterPoint Energy’s ownership in RRI to its shareholders, CERC had guaranteed certain contractual obligations of what became RRI’s trading subsidiary.  When the companies separated, RRI agreed to secure CERC against obligations under the guaranties RRI had been unable to extinguish by the time of separation.  Pursuant to such agreement, as amended in December 2007, RRI (now GenOn) agreed to provide to CERC cash or letters of credit as security against CERC’s obligations under its remaining guaranties for demand charges under certain gas transportation agreements if and to the extent changes in market conditions expose CERC to a risk of loss on those guaranties based on an annual calculation, with any required collateral to be posted each December.  The undiscounted maximum potential payout of the demand charges under these transportation contracts, which will be in effect until 2018, was approximately $73 million as of December 31, 2012. Based on market conditions in the fourth quarter of 2012 at the time the most recent annual calculation was made under the agreement, GenOn was not obligated to post any security. As a result, CERC returned to GenOn in the fourth quarter of 2012 the approximately $28 million of aggregate collateral previously posted by GenOn under the agreement.  If GenOn should fail to perform the contractual obligations, CERC could have to honor its guarantee and, in such event, any collateral then provided as security may be insufficient to satisfy CERC's obligations.

(13)           Unaudited Quarterly Information

Summarized quarterly financial data is as follows:

	Year Ended December 31, 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in millions)
Revenues	$	2,095	$	1,228	$	1,171	$	1,608
Operating income	260		114		111		177
Net income	133		47		43		93

	Year Ended December 31, 2012
	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	(in millions)
Revenues	$	1,550	$	846	$	954		$	1,551
Operating income (loss)	229		106		(152		)	211
Net income (loss)	118		42		(127		)	104

(14)           Reportable Business Segments

Because CERC is an indirect wholly owned subsidiary of CenterPoint Energy, CERC’s determination of reportable business segments considers the strategic operating units under which CenterPoint Energy manages sales, allocates resources and assesses performance of various products and services to wholesale or retail customers in differing regulatory environments. The accounting

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policies of the business segments are the same as those described in the summary of significant accounting policies except that some executive benefit costs have not been allocated to business segments.  CERC uses operating income as the measure of profit or loss for its business segments.

CERC’s reportable business segments include the following: Natural Gas Distribution, Competitive Natural Gas Sales and Services, Interstate Pipelines, Field Services and Other Operations.  Natural Gas Distribution consists of intrastate natural gas sales to, and natural gas transportation and distribution for, residential, commercial, industrial and institutional customers. Competitive Natural Gas Sales and Services represents CenterPoint Energy’s non-rate regulated gas sales and services operations. The Interstate Pipelines business segment includes the interstate natural gas pipeline operations. The Field Services business segment includes the non-rate regulated natural gas gathering, processing and treating operations. The Other Operations business segment includes unallocated corporate costs and inter-segment eliminations.

Long-lived assets include net property, plant and equipment, net goodwill and other intangibles and equity investments in unconsolidated subsidiaries. Intersegment sales are eliminated in consolidation.

Financial data for business segments and products and services are as follows (in millions):

	Revenues from External Customers		Inter-segment Revenues			Depreciation and Amortization		Operating Income (Loss)			Total Assets			Expenditures for Long- Lived Assets
As of and for the year ended December 31, 2010:
Natural Gas Distribution	$	3,199	$	14		$	166	$	231		$	4,575		$	202
Competitive Natural Gas Sales and Services	2,617		34			4		16			1,190			2
Interstate Pipelines (1)	464		137			52		270			3,672			102
Field Services (2)	289		49			25		151			1,803			668
Other	—		—			1		(1		)	659			—
Reconciling Eliminations	—		(234		)	—		—			(1,361		)	—
Consolidated	$	6,569	$	—		$	248	$	667		$	10,538		$	974
As of and for the year ended December 31, 2011:
Natural Gas Distribution	$	2,823	$	18		$	166	$	226		$	4,636		$	295
Competitive Natural Gas Sales and Services	2,488		23			5		6			1,089			5
Interstate Pipelines (1)	421		132			54		248			3,867			98
Field Services (2)	370		42			37		189			1,894			201
Other	—		—			—		(7		)	660			—
Reconciling Eliminations	—		(215		)	—		—			(1,459		)	—
Consolidated	$	6,102	$	—		$	262	$	662		$	10,687		$	599
As of and for the year ended December 31, 2012:
Natural Gas Distribution	$	2,320	$	22		$	173	$	226		$	4,775		$	359
Competitive Natural Gas Sales and Services	1,758		26			6		(250		)	839			6
Interstate Pipelines (1)	356		146			56		207			4,004			132
Field Services (2)	467		39			50		214			2,453			52
Other	—		—			—		(3		)	647			—
Reconciling Eliminations	—		(233		)	—		—			(1,528		)	—
Consolidated	$	4,901	$	—		$	285	$	394		$	11,190		$	549

________________

(1) Interstate Pipelines recorded equity income of $19 million, $21 million and $26 million in the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in SESH, a jointly-owned pipeline. These amounts are included

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in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Interstate Pipelines’ investment in SESH was $413 million, $409 million and $404 million as of December 31, 2010, 2011 and 2012, respectively, and is included in Investment in unconsolidated affiliates.

(2) Field Services recorded equity income of $10 million, $9 million and $5 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in a jointly-owned gas processing plant. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Field Services’ investment in the jointly-owned gas processing plant was $55 million and $63 million as of December 31, 2010 and 2011, respectively, and is included in Investment in unconsolidated affiliates. Beginning on August 1, 2012, financial results for Waskom are included in operating income due to the July 31, 2012 purchase of the 50% interest in Waskom that CERC did not already own.

	Year Ended December 31,
Revenues by Products and Services:	2010		2011		2012
	(in millions)
Retail gas sales	$	4,412	$	4,019	$	3,328
Wholesale gas sales	1,250		1,149		613
Gas transportation and processing	785		824		847
Energy products and services	122		110		113
Total	$	6,569	$	6,102	$	4,901

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Disclosure Controls and Procedures

In accordance with Exchange Act Rules 13a-15 and 15d-15, we carried out an evaluation, under the supervision and with the participation of management, including our principal executive officer and principal financial officer, of the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of December 31, 2012 to provide assurance that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms and such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding disclosure.

There has been no change in our internal controls over financial reporting that occurred during the three months ended December 31, 2012 that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Management’s Annual Report on Internal Control over Financial Reporting

See report set forth above in Item 8, “Financial Statements and Supplementary Data.”

Item 9B. Other Information

The ratio of earnings to fixed charges as calculated pursuant to Securities and Exchange Commission rules was 3.30, 2.63, 3.05, 3.50 and 3.05 for the years ended December 31, 2008, 2009, 2010, 2011 and 2012, respectively.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information called for by Item 10 is omitted pursuant to Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly Owned Subsidiaries).

Item 11. Executive Compensation

The information called for by Item 11 is omitted pursuant to Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly Owned Subsidiaries).

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information called for by Item 12 is omitted pursuant to Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly Owned Subsidiaries).

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information called for by Item 13 is omitted pursuant to Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly Owned Subsidiaries).

Item 14. Principal Accounting Fees and Services

Aggregate fees billed to CERC during the fiscal years ending December 31, 2011 and 2012 by its principal accounting firm, Deloitte & Touche LLP, are set forth below.

	Year Ended December 31,
	2011		2012
Audit fees (1)	$	1,346,124	$	1,388,798
Audit-related fees (2)	55,500		72,500
Total audit and audit-related fees	1,401,624		1,461,298
Tax fees	—		—
All other fees	—		—
Total fees	$	1,401,624	$	1,461,298

________________

(1) For 2011 and 2012, amounts include fees for services provided by the principal accounting firm relating to the integrated audit of financial statements and internal control over financial reporting, statutory audits, attest services, and regulatory filings.

(2) For 2011 and 2012, includes fees for consultations concerning financial accounting and reporting standards and various agreed-upon or expanded procedures related to accounting records to comply with financial accounting or regulatory reporting matters.

CERC is not required to have, and does not have, an audit committee.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

(a)(1) Financial Statements.
Report of Independent Registered Public Accounting Firm	37
Statements of Consolidated Income for the Three Years Ended December 31, 2012	39
Statements of Consolidated Comprehensive Income for the Three Years Ended December 31, 2012	40
Consolidated Balance Sheets at December 31, 2011 and 2012	41
Statements of Consolidated Cash Flows for the Three Years Ended December 31, 2012	42
Statements of Consolidated Stockholder’s Equity for the Three Years Ended December 31, 2012	43
Notes to Consolidated Financial Statements	44
(a)(2) Financial Statement Schedules for the Three Years Ended December 31, 2012.
Report of Independent Registered Public Accounting Firm	69
II— Valuation and Qualifying Accounts	70

The following schedules are omitted because of the absence of the conditions under which they are required or because the required information is included in the financial statements:

I, III, IV and V.

(a)(3) Exhibits.

See Index of Exhibits beginning on page 72.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholder of

CenterPoint Energy Resources Corp.

Houston, Texas

We have audited the consolidated financial statements of CenterPoint Energy Resources Corp. and subsidiaries (the "Company", an indirect wholly owned subsidiary of CenterPoint Energy, Inc.) as of December 31, 2012 and 2011, and for each of the three years in the period ended December 31, 2012, and have issued our reports thereon dated March 8, 2013; such report is included elsewhere in this Form 10-K. Our audits also included the financial statement schedule of the Company listed in the index at Item 15(a)(2). This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

March 8, 2013

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CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

For the Three Years Ended December 31, 2012

Column A	Column B		Column C					Column D		Column E
Description	Balance at Beginning of Period		Additions					Deductions From Reserves (1)		Balance at End of Period
			Charged to Income			Charged to Other Accounts
	(in millions)
Year Ended December 31, 2012:
Accumulated provisions:
Uncollectible accounts receivable	$	24	$	15		$	—	$	16	$	23
Deferred tax asset valuation allowance	3		(1		)	—		—		2
Year Ended December 31, 2011:
Accumulated provisions:
Uncollectible accounts receivable	$	25	$	25		$	—	$	26	$	24
Deferred tax asset valuation allowance	3		—			—		—		3
Year Ended December 31, 2010:
Accumulated provisions:
Uncollectible accounts receivable	$	23	$	30		$	—	$	28	$	25
Deferred tax asset valuation allowance	5		(2		)	—		—		3

________________

(1) Deductions from reserves represent losses or expenses for which the respective reserves were created. In the case of the uncollectible accounts reserve, such deductions are net of recoveries of amounts previously written off.

70

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, the State of Texas, on the 8th day of March, 2013.

	CENTERPOINT ENERGY RESOURCES CORP.
	(Registrant)
By:	/s/ DAVID M. MCCLANAHAN
	David M. McClanahan
	President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on March 8, 2013.

Signature	Title
/s/ DAVID M. MCCLANAHAN	Chairman, President and Chief Executive Officer
(David M. McClanahan)	(Principal Executive Officer and Director)
/s/ GARY L. WHITLOCK	Executive Vice President and Chief Financial Officer
(Gary L. Whitlock)	(Principal Financial Officer)
/s/ WALTER L. FITZGERALD	Senior Vice President and Chief Accounting Officer
(Walter L. Fitzgerald)	(Principal Accounting Officer)

71

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

EXHIBITS TO THE ANNUAL REPORT ON FORM 10-K

For Fiscal Year Ended December 31, 2012

INDEX OF EXHIBITS

Exhibits not incorporated by reference to a prior filing are designated by a cross (+); all exhibits not so designated are incorporated herein by reference to a prior filing as indicated.

Exhibit Number	Description	Report or Registration Statement	SEC File or Registration Number	Exhibit Reference
2(a)(1)	Agreement and Plan of Merger among CERC, Houston Lighting and Power Company (“HL&P”), HI Merger, Inc. and NorAm Energy Corp. (“NorAm”) dated August 11, 1996	Houston Industries’ (“HI’s”) Form 8-K dated August 11, 1996	1-7629	2
2(a)(2)	Amendment to Agreement and Plan of Merger among CERC, HL&P, HI Merger, Inc. and NorAm dated August 11, 1996	Registration Statement on Form S-4	333-11329	2(c)
2(b)	Agreement and Plan of Merger dated December 29, 2000 merging Reliant Resources Merger Sub, Inc. with and into Reliant Energy Services, Inc.	Registration Statement on Form S-3	333-54526	2
3(a)(1)	Certificate of Incorporation of Reliant Energy Resources Corp. (“RERC Corp.”)	Form 10-K for the year ended December 31, 1997	1-3187	3(a)(1)
3(a)(2)	Certificate of Merger merging former NorAm Energy Corp. with and into HI Merger, Inc. dated August 6, 1997	Form 10-K for the year ended December 31, 1997	1-3187	3(a)(2)
3(a)(3)	Certificate of Amendment changing the name to Reliant Energy Resources Corp.	Form 10-K for the year ended December 31, 1998	1-3187	3(a)(3)
3(a)(4)	Certificate of Amendment changing the name to CenterPoint Energy Resources Corp.	Form 10-Q for the quarter ended June 30, 2003	1-13265	3(a)(4)
3(b)	Bylaws of RERC Corp.	Form 10-K for the year ended December 31, 1997	1-3187	3(b)
4(a)(1)	Indenture, dated as of February 1, 1998, between RERC Corp. and Chase Bank of Texas, National Association, as Trustee	Form 8-K dated February 5, 1998	1-13265	4.1
4(a)(2)	Supplemental Indenture No. 1, dated as of February 1, 1998, providing for the issuance of RERC Corp.’s 6 1/2% Debentures due February 1, 2008	Form 8-K dated February 5, 1998	1-13265	4.2

72

Exhibit Number	Description	Report or Registration Statement	SEC File or Registration Number	Exhibit Reference
4(a)(3)	Supplemental Indenture No. 2, dated as of November 1, 1998, providing for the issuance of RERC Corp.’s 6 3/8% Term Enhanced ReMarketable Securities	Form 8-K dated November 9, 1998	1-13265	4.1
4(a)(4)	Supplemental Indenture No. 3, dated as of July 1, 2000, providing for the issuance of RERC Corp.’s 8.125% Notes due 2005	Registration Statement on Form S-4	333-49162	4.2
4(a)(5)	Supplemental Indenture No. 4, dated as of February 15, 2001, providing for the issuance of RERC Corp.’s 7.75% Notes due 2011	Form 8-K dated February 21, 2001	1-13265	4.1
4(a)(6)	Supplemental Indenture No. 5, dated as of March 25, 2003, providing for the issuance of CERC Corp.’s 7.875% Senior Notes due 2013	Form 8-K dated March 18, 2003	1-13265	4.1
4(a)(7)	Supplemental Indenture No. 6, dated as of April 14, 2003, providing for the issuance of CERC Corp.’s 7.875% Senior Notes due 2013	Form 8-K dated April 7, 2003	1-13265	4.2
4(a)(8)	Supplemental Indenture No. 7, dated as of November 3, 2003, providing for the issuance of CERC Corp.’s 5.95% Senior Notes due 2014	Form 8-K dated October 29, 2003	1-13265	4.2
4(a)(9)	Supplemental Indenture No. 8, dated as of December 28, 2005, providing for the issuance of CERC Corp.’s 6 1/2% Debentures due 2008	CenterPoint Energy, Inc.’s (“CNP’s”) Form 10-K for the year ended December 31, 2005	1-31447	4(f)(9)
4(a)(10)	Supplemental Indenture No. 9, dated as of May 18, 2006, providing for the issuance of CERC Corp.’s 6.15% Senior Notes due 2016	CNP’s Form 10-Q for the quarter ended June 30, 2006	1-31447	4.7
4(a)(11)	Supplemental Indenture No. 10, dated as of February 6, 2007, providing for the issuance of CERC Corp.’s 6.25% Senior Notes due 2037	CNP’s Form 10-K for the year ended December 31, 2007	1-31447	4(f)(11)
4(a)(12)	Supplemental Indenture No. 11 dated as of October 23, 2007, providing for the issuance of CERC Corp.’s 6.125% Senior Notes due 2017	CNP’s Form 10-Q for quarter ended September 30, 2007	1-31447	4.8
4(a)(13)	Supplemental Indenture No. 12  dated as of October 23, 2007, providing for the issuance of CERC Corp.’s 6.625% Senior Notes due 2037	CNP’s Form 10-Q for quarter ended September 30, 2007	1-31447	4.9
4(a)(14)	Supplemental Indenture No. 13  dated as of May 15, 2008, providing for the issuance of CERC Corp.’s 6.00% Senior Notes due 2018	CNP’s Form 10-Q for quarter ended June 30, 2008	1-31447	4.9

73

Exhibit Number	Description	Report or Registration Statement	SEC File or Registration Number	Exhibit Reference
4(a)(15)	Supplemental Indenture No. 14 to Exhibit 4(a)(1) dated as of January 11, 2011, providing for the issuance of CERC Corp.’s 4.50% Senior Notes due 2021 and 5.85% Senior Notes due 2041	CNP’s Form 10-K for the year ended December 31, 2010	1-31447	4(a)(15)
4(a)(16)	Supplemental Indenture No. 15 to Exhibit 4(a)(1) dated as of January 20, 2011, providing for the issuance of  CERC Corp.’s 4.50% Senior Notes due 2021	CNP’s Form 10-K for the year ended December 31, 2010	1-31447	4(a)(16)
4(b)	$950,000,000 Credit Agreement dated as of September 9, 2011, among CERC Corp., as Borrower, and the banks named therein	Form 8-K dated September 9, 2011	1-31447	4.3

There have not been filed as exhibits to this Form 10-K certain long-term debt instruments, including indentures, under which the total amount of securities do not exceed 10% of the total assets of CERC. CERC hereby agrees to furnish a copy of any such instrument to the SEC upon request.

Exhibit Number	Description	Report or Registration Statement	SEC File or Registration Number	Exhibit Reference
10(a)	Service Agreement by and between Mississippi River Transmission Corporation and Laclede Gas Company dated August 22, 1989	NorAm’s Form 10-K for the year ended December 31, 1989	1-13265	10.20
+12	Computation of Ratios of Earnings to Fixed Charges
+23	Consent of Deloitte & Touche LLP
+31.1	Rule 13a-14(a)/15d-14(a) Certification of David M. McClanahan
+31.2	Rule 13a-14(a)/15d-14(a) Certification of Gary L. Whitlock
+32.1	Section 1350 Certification of David M. McClanahan
+32.2	Section 1350 Certification of Gary L. Whitlock
+101.INS	XBRL Instance Document (1)
+101.SCH	XBRL Taxonomy Extension Schema Document (1)
+101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document (1)
+101.DEF	XBRL Taxonomy Extension Definition Linkbase Document (1)
+101.LAB	XBRL Taxonomy Extension Labels Linkbase Document (1)
+101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document (1)
(1)	Furnished, not filed.

74

EX-12

Exhibit 12

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES

(Millions of Dollars)

	Year Ended December 31,
	2008 (1)			2009 (1)			2010 (1)			2011 (1)		2012 (1)
Net Income	$	343		$	230		$	300		$	316	$	137
Equity in earnings of unconsolidated affiliates, net of distributions	(51		)	(3		)	13			8		8
Income taxes	228			146			187			187		246
Capitalized interest	(5		)	(2		)	(7		)	—		(2		)
	515			371			493			511		389
Fixed charges, as defined:
Interest	206			213			208			190		179
Capitalized interest	5			2			7			—		2
Interest component of rentals charged to operating expense	13			12			25			14		9
Total fixed charges	224			227			240			204		190
Earnings, as defined	$	739		$	598		$	733		$	715	$	579
Ratio of earnings to fixed charges	3.30			2.63			3.05			3.50		3.05

         ___________

(1) Excluded from the computation of fixed charges for the years ended December 31, 2008, 2009, 2010, 2011 and 2012 is interest income of $1 million, $-0-, $1 million, $-0- and $3 million, respectively, which is included in income tax expense.

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-169666-01 on Form S-3 of our reports dated March 8, 2013, relating to the consolidated financial statements and financial statement schedule of CenterPoint Energy Resources Corp. and subsidiaries, appearing in this Annual Report on Form 10-K of CenterPoint Energy Resources Corp. for the year ended December 31, 2012.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

March 8, 2013

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, David M. McClanahan, certify that:

1.           I have reviewed this annual report on Form 10-K of CenterPoint Energy Resources Corp.;

2.           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;

3.           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;

4.           The registrant's other certifying officer(s) 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

5.           The registrant's other certifying officer(s) 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 (or persons performing the equivalent functions):

(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:  March 8, 2013

/s/ David M. McClanahan

David M. McClanahan

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Gary L. Whitlock, certify that:

1.           I have reviewed this annual report on Form 10-K of CenterPoint Energy Resources Corp.;

2.           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;

3.           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;

4.           The registrant's other certifying officer(s) 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

5.           The registrant's other certifying officer(s) 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 (or persons performing the equivalent functions):

(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:  March 8, 2013

/s/ Gary L. Whitlock

Gary L. Whitlock

Executive Vice President and 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 of CenterPoint Energy Resources Corp. (the “Company”) on Form 10-K for the year ended December 31, 2012 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, David M. McClanahan, Chief Executive Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1.           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.           The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ David M. McClanahan

David M. McClanahan

President and Chief Executive Officer

March 8, 2013

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 of CenterPoint Energy Resources Corp. (the “Company”) on Form 10-K for the year ended December 31, 2012 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, Gary L. Whitlock, Chief Financial Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1.           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.           The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Gary L. Whitlock

Gary L. Whitlock

Executive Vice President and Chief Financial Officer

March 8, 2013

XML

Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Mar. 31, 2010
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets in other long-term assets					$ 1
Regulatory liabilities	(619)		(597)
Net Regulatory Assets (Liabilities)	(514)		(500)
Other Longterm Regulatory Assets Member
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets in other long-term assets	$ 105	[1]	$ 97	[1]

[1] Regulatory assets that are not earning a return were not material at December 31, 2011 and 2012.

XML

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Years	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Recovery of compensatory damages sought by plaintiffs	in excess of $1 billion
Approximate number of gas market manipulation lawsuits naming CenterPoint Energy and/or Reliant Energy (in number of lawsuits)	30
Number of gas market manipulation lawsuits pending for CenterPoint Energy and its affiliates (in number of lawsuits)	2
Number of gas mismeasurement lawsuits pending for CenterPoint Energy and its affiliates (in number of lawsuits)	2
Approximate number of pipeline companies named in the mismeasurement lawsuits (in number of companies)	245
Number of gas measurement lawsuits seeking class certification and has four amendments (in number of cases)	1
Number of times gas measurement lawsuit was amended (in number of amendments)	4
Number of years the plaintiffs claim the defendants have engaged in the systematic mismeasurement of natural gas (in years)	25
Number of CenterPoint subsidiaries dismissed from the claims of the plaintiff (in number of claims)	2
Number of sites where remediation is complete, other than ongoing operations (in number of sites)	2
Number of remaining sites in the Minnesota service territory (in number of sites)	5
Number of remaining sites in the Minnesota territory where the company believes it has no liability (in number of sites)	2
Amount accrued for remediation of Minnesota sites	$ 14,000,000
Minimum estimated remediation costs for the Minnesota sites	6,000,000
Maximum estimated remediation costs for the Minnesota sites	41,000,000
Minimum years of remediation for the Minnesota sites (in years)	30
Maximum years of remediation for the Minnesota sites (in years)	50
Annual amount included in rates to fund normal on-going remediation costs	285,000
Amount collected from insurance companies to be used for future environmental remediation	5,800,000
Approximate amount of undiscounted maximum potential demand charges under the transportation contracts	73,000,000
Approximate amount of collateral returned	28,000,000
Operating Leases, Future Minimum Payments Due [Abstract]
2013	12,000,000
2014	8,000,000
2015	5,000,000
2016	5,000,000
2017	3,000,000
2018 and beyond	13,000,000
Total	46,000,000
Total lease expense for all operating leases	26,000,000	42,000,000	76,000,000
Natural Gas supply commitments [Member]
Recorded Unconditional Purchase Obligation [Line Items]
2013	430,000,000
2014	344,000,000
2015	214,000,000
2016	149,000,000
2017	96,000,000
After 2017	156,000,000
Long-Term Gas Gathering and Treating Agreements [Member]
Schedule of Capital Expansion Projects [Abstract]
Total Capacity Of System After Potential Additional Expansion (MMcf)	1,300
Estimated Total Capital Expenditures For Expansion	$ 440,000,000

XML

Short-term Borrowings and Long-term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Short-term Debt	$ 38	[1]	$ 62	[1]
Long-term Debt	0		0
Long-term Debt, Excluding Current Maturities	2,276		2,919
Long-term Debt, Current Maturities	365	[1]	0	[1]
Short Term Borrowings And Current Portion Long Term Debt	403	[1]	62	[1]
Long-term Debt, Maturities in 2013	365
Long-term Debt, Maturities in 2014	160
Long-term Debt, Maturities in 2015	0
Long-term Debt, Maturities in 2016	325
Long-term Debt, Maturities in 2017	250
Inventory financing [Member]
Debt Instrument [Line Items]
Short-term Debt	38	[1]	62	[1]
Long-term Debt	0		0
Line of Credit [Member] | CERC Corp [Member]
Debt Instrument [Line Items]
Size of Facility	950		950
Loans	0		0
Letters of Credit	0		0
Commercial Paper	0		285
Line of Credit Facility, Interest Rate Description	London Interbank Offered Rate plus 150 basis points
Percentage on limitation of debt to total capitalization under covenant (in hundredths)	65.00%
Senior notes 2013 to 2041 [Member]
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	2,328		2,693
Long-term Debt, Current Maturities	365	[1]	0	[1]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	4.50%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	7.875%
Commercial Paper [Member]
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	0	[2]	285	[2]
Long-term Debt, Current Maturities	0	[1],[2]	0	[1],[2]
Unamortized Discount Premium Member
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	(52)		(59)
Long-term Debt, Current Maturities	$ 0	[1]	$ 0	[1]

[1] Includes amounts due or exchangeable within one year of the date noted.

[2] Classified as long-term debt because the termination date of the facility that backstops the commercial paper is more than one year from the date noted.

XML

Unaudited Quarterly Information (Tables)

12 Months Ended

Dec. 31, 2012

Unaudited Quarterly Information [Abstract]

Quarterly financial data

Summarized quarterly financial data is as follows:

	Year Ended December 31, 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in millions)
Revenues	$	2,095	$	1,228	$	1,171	$	1,608
Operating income	260		114		111		177
Net income	133		47		43		93

	Year Ended December 31, 2012
	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	(in millions)
Revenues	$	1,550	$	846	$	954		$	1,551
Operating income (loss)	229		106		(152		)	211
Net income (loss)	118		42		(127		)	104

XML

Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Goodwill by reportable business segment as of December 31, 2011 and 2012 is as follows (in millions):

	December 31, 2011		Impairment Charge		Acquisition		December 31, 2012
Natural Gas Distribution	$	746	$	—	$	—	$	746
Interstate Pipelines	579		—		—		579
Competitive Natural Gas Sales and Services	335		252		—		83
Field Services	25		—		24		49
Other Operations	11		—		—		11
Total	$	1,696	$	252	$	24	$	1,468

XML

Reportable Business Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue from External Customers											$ 4,901		$ 6,102		$ 6,569
Inter-segment Revenues											0		0		0
Depreciation and Amortization											285		262		248
Operating Income (Loss)	211		(152)	106	229	177		111	114	260	394		662		667
Total Assets	11,190					10,687					11,190		10,687		10,538
Expenditures for Long-Lived Assets											549		599		974
Equity income											31		30		29
Retail gas sales											3,328		4,019		4,412
Wholesale gas sales											613		1,149		1,250
Gas transportation and processing											847		824		785
Energy products and services											113		110		122
Total	1,551		954	846	1,550	1,608		1,171	1,228	2,095	4,901		6,102		6,569
Natural Gas Distribution [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											2,320		2,823		3,199
Inter-segment Revenues											22		18		14
Depreciation and Amortization											173		166		166
Operating Income (Loss)											226		226		231
Total Assets	4,775					4,636					4,775		4,636		4,575
Expenditures for Long-Lived Assets											359		295		202
Competitive Natural Gas Sales and Services [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											1,758		2,488		2,617
Inter-segment Revenues											26		23		34
Depreciation and Amortization											6		5		4
Operating Income (Loss)											(250)		6		16
Total Assets	839					1,089					839		1,089		1,190
Expenditures for Long-Lived Assets											6		5		2
Interstate Pipelines [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											356	[1]	421	[1]	464	[1]
Inter-segment Revenues											146	[1]	132	[1]	137	[1]
Depreciation and Amortization											56	[1]	54	[1]	52	[1]
Operating Income (Loss)											207	[1]	248	[1]	270	[1]
Total Assets	4,004	[1]				3,867	[1]				4,004	[1]	3,867	[1]	3,672	[1]
Expenditures for Long-Lived Assets											132	[1]	98	[1]	102	[1]
Equity income											26		21		19
Interest in jointly-owned asset (in hundredths)	50.00%										50.00%
Investment in unconsolidated affiliate	404					409					404		409		413
Field Services [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											467	[2]	370	[2]	289	[2]
Inter-segment Revenues											39	[2]	42	[2]	49	[2]
Depreciation and Amortization											50	[2]	37	[2]	25	[2]
Operating Income (Loss)											214	[2]	189	[2]	151	[2]
Total Assets	2,453	[2]				1,894	[2]				2,453	[2]	1,894	[2]	1,803	[2]
Expenditures for Long-Lived Assets											52	[2]	201	[2]	668	[2]
Equity income											5		9		10
Interest in jointly-owned asset (in hundredths)	50.00%										50.00%
Investment in unconsolidated affiliate						63							63		55
Other [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											0		0		0
Inter-segment Revenues											0		0		0
Depreciation and Amortization											0		0		1
Operating Income (Loss)											(3)		(7)		(1)
Total Assets	647					660					647		660		659
Expenditures for Long-Lived Assets											0		0		0
Reconciling Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers											0		0		0
Inter-segment Revenues											(233)		(215)		(234)
Depreciation and Amortization											0		0		0
Operating Income (Loss)											0		0		0
Total Assets	(1,528)					(1,459)					(1,528)		(1,459)		(1,361)
Expenditures for Long-Lived Assets											$ 0		$ 0		$ 0

[1] Interstate Pipelines recorded equity income of $19 million, $21 million and $26 million in the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in SESH, a jointly-owned pipeline. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption. Interstate Pipelines’ investment in SESH was $413 million, $409 million and $404 million as of December 31, 2010, 2011 and 2012, respectively, and is included in Investment in unconsolidated affiliates.

[2] Field Services recorded equity income of $10 million, $9 million and $5 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in a jointly-owned gas processing plant. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption. Field Services’ investment in the jointly-owned gas processing plant was $55 million and $63 million as of December 31, 2010 and 2011, respectively, and is included in Investment in unconsolidated affiliates. Beginning on August 1, 2012, financial results for Waskom are included in operating income due to the July 31, 2012 purchase of the 50% interest in Waskom that CERC did not already own.

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Employee Benefit Plans Other Employee Matters (Details) (Workforce Subject to Collective Bargaining Arrangements [Member])	12 Months Ended
	Dec. 31, 2012
Workforce Subject to Collective Bargaining Arrangements [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	28.00%

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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,615	$ 8,519
Accumulated depreciation and amortization	1,714	1,489
Property, Plant and Equipment, Net	7,901	7,030
Depreciation expense	267	244	232
Amortization expense	18	18	16
Total depreciation and amortization expense	285	262	248
Beginning balance	132	58
Accretion expense	6	3
Revisions in estimates of cash flows	(3)	71
Ending balance	135	132	58
Increase (Decrease) in ARO from the revision of estimate	(3)	71
Natural Gas Distribution [Member]
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives (in years)	32
Property, Plant and Equipment, Gross	4,321	3,959
Accumulated depreciation and amortization	1,194	1,069
Competitive Natural Gas Sales and Services [Member]
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives (in years)	26
Property, Plant and Equipment, Gross	80	76
Accumulated depreciation and amortization	25	20
Interstate Pipelines [Member]
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives (in years)	56
Property, Plant and Equipment, Gross	2,803	2,675
Accumulated depreciation and amortization	355	302
Field Services [Member]
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives (in years)	42
Property, Plant and Equipment, Gross	2,359	1,754
Accumulated depreciation and amortization	118	72
Other property [Member]
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives (in years)	12
Property, Plant and Equipment, Gross	52	55
Accumulated depreciation and amortization	$ 22	$ 26

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2012	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense (benefit):
Federal			$ 0	$ 34	$ (38)
State			1	9	17
Total current expense (benefit)			1	43	(21)
Deferred income tax expense (benefit):
Federal			198	140	234
State			47	4	(26)
Total deferred expense			245	144	208
Total income tax expense			246	187	187
Income tax reconciliation
Income before income taxes			383	503	487
Federal statutory income tax rate			35.00%	35.00%	35.00%
Expected federal income tax expense			134	176	170
Increase (decrease) in tax expense resulting from:
State income tax expense (benefit), net of federal income tax			31	9	(6)
Increase (decrease) in settled and uncertain income tax positions			(7)	1	5
Tax law change in deductibility of retiree health care costs			0	0	18
Goodwill impairment			88	0	0
Other, net			0	1	0
Total			112	11	17
Total income tax expense			246	187	187
Effective tax rate			64.20%	37.20%	38.40%
Goodwill impairment	252		252	0	0
Tax Adjustments, Settlements, and Unusual Provisions			(7)
Amount of reduction to deferred tax assets due to actuarially determined net present value of lost future health care deductions		22
Amount of non-cash recorded to income tax expense as result of change in tax law					19
Amount of reduction to deferred tax assets, recorded to income tax expense, due to actuarially determined net present value of lost future health care deductions		19
Regulatory Assets		1
Amount of decrease in income tax expense recorded related to effects of re-measuring accumulated deferred income taxes					24
Amount of net reduction to income tax expense from state income tax expense, net of federal income tax				20	29
Increase in income tax expense related to uncertain tax positions					5
Deferred Tax Assets [Abstract]
Allowance for Doubtful Accounts			9	9
Other, current deferred tax assets			0	(1)
Total current deferred tax assets			9	8
Employee Benefits			49	57
Loss And Credit Carryforwards			192	238
Regulatory liabilities, net		2	196	0
Other, noncurrent deferred tax assets			51	60
Total non-current deferred tax assets before valuation allowance			488	355
Valuation Allowance			(2)	(3)
Total non-current deferred tax assets, net of valuation allowance			486	352
Total deferred tax assets, net of valuation allowance			495	360
Deferred Tax Liabilities [Abstract]
Deferred Gas Costs			25	0
Other, current deferred tax liabilities			5	0
Total current deferred tax liabilities			30	0
Depreciation			2,033	1,696
Regulatory assets, net			0	17
Other, non-current deferred tax liabilities			129	59
Total non-current deferred tax liabilities			2,162	1,772
Total deferred tax liabilities			2,192	1,772
Accumulated deferred income taxes, net			1,697	1,412
Reconciliation of Unrecognized Tax Benefits (Expenses) [Roll Forward]
Balance, beginning of year		6	8	11	6
Tax Positions Related to Prior Years:
Additions			0	(1)	0
Reductions			(27)	(3)	(2)
Tax Positions Related to Current Year:
Additions			0	1	7
Reductions			(1)	0	0
Balance, end of year			(20)	8	11
Interest expense on uncertain income tax positions			(3)	0	0
Accrued interest receivable on uncertain income tax positions			7	4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			0	6	5
Federal [Member]
Deferred Tax Liabilities [Abstract]
Federal net operating loss carryforwards to expire in 2030			487
Operating Loss Carryforwards, Expiration Dates			2031
Other Tax Carryforward, Expiration Dates			2013 and 2032
State [Member]
Deferred Tax Liabilities [Abstract]
Operating Loss Carryforwards, Expiration Dates			2013 and 2032
State net operating loss carryforwards to expire in various years between 2012 and 2031			377
Other Tax Carryforward, Expiration Dates			2017
State capital loss carryforwards which expire in 2017			244
State capital loss carryforwards, full valuation allowance			3
State capital loss carryforwards, valuation allowance net of federal tax			2
Capital Loss Carryforward [Member] | Federal [Member]
Deferred Tax Liabilities [Abstract]
Other Tax Carryforward, Gross Amount			1
Charitable Contribution Carryforward [Member] | Federal [Member]
Deferred Tax Liabilities [Abstract]
Other Tax Carryforward, Gross Amount			$ 1

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

Summary of Significant Accounting Policies

(a) Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

(b) Principles of Consolidation

The accounts of CERC Corp. and its wholly owned and majority owned subsidiaries are included in CERC's consolidated financial statements. All intercompany transactions and balances are eliminated in consolidation. CERC uses the equity method of accounting for investments in entities in which CERC has an ownership interest between 20% and 50% and exercises significant influence.

CERC’s investments in unconsolidated affiliates include a 50% ownership interest in Southeast Supply Header, LLC (SESH), which owns and operates a 274-mile interstate natural gas pipeline.

Prior to July 2012, CERC owned a 50% interest in Waskom Gas Processing Company (Waskom), a Texas general partnership, which owns and operates a natural gas processing plant and natural gas gathering assets. During 2010, CERC invested $20 million in Waskom. On July 31, 2012, CERC purchased the 50% interest that it did not already own in Waskom, as well as other gathering and related assets from a third-party for approximately $273 million. The amount of the purchase price allocated to the acquisition of the 50% interest in Waskom was approximately $201 million, with the remaining purchase price allocated to the other gathering assets, based on a discounted cash flow methodology. The $273 million purchase price was allocated as follows: $253 million to property, plant and equipment; $16 million to goodwill; and the remaining balance to other assets and liabilities. The purchase of the 50% interest in Waskom was determined to be a business combination achieved in stages, and as such CERC recorded a pre-tax gain of approximately $136 million on July 31, 2012, which is the result of remeasuring CERC's original 50% interest in Waskom to fair value. As a result of the purchase, CERC recorded goodwill of $24 million, which includes $17 million related to Waskom (including the re-measurement of its existing 50% interest) and $7 million related to the other gathering and related assets.

Other investments, excluding marketable securities, are carried at cost.

(c) Revenues

CERC records revenue for natural gas sales and services under the accrual method and these revenues are recognized upon delivery to customers. Natural gas sales not billed by month-end are accrued based upon estimated purchased gas volumes, estimated lost and unaccounted for gas and currently effective tariff rates. The Interstate Pipelines and Field Services business segments record revenues as transportation and processing services are provided.

(d) Long-lived Assets and Intangibles

CERC records property, plant and equipment at historical cost. CERC expenses repair and maintenance costs as incurred. CERC periodically evaluates long-lived assets, including property, plant and equipment, and specifically identifiable intangibles, when events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. The determination of whether an impairment has occurred is based on an estimate of undiscounted cash flows attributable to the assets, compared to the carrying value of the assets.

(e) Regulatory Assets and Liabilities

CERC applies the guidance for accounting for regulated operations to the Natural Gas Distribution business segment and to portions of the Interstate Pipelines business segment. CERC’s rate-regulated businesses recognize removal costs as a component of depreciation expense in accordance with regulatory treatment. As of both December 31, 2011 and 2012, these removal costs of $573 million are classified as regulatory liabilities in the Consolidated Balance Sheets.  In addition, a portion of the amount of removal costs that relate to asset retirement obligations has been reclassified from a regulatory liability to an asset retirement liability in accordance with accounting guidance for conditional asset retirement obligations.

(f) Depreciation and Amortization Expense

Depreciation and amortization is computed using the straight-line method based on economic lives or regulatory-mandated recovery periods. Amortization expense includes amortization of regulatory assets and other intangibles.

(g) Capitalization of Interest and Allowance for Funds Used During Construction

Interest and allowance for funds used during construction (AFUDC) are capitalized as a component of projects under construction and are amortized over the assets’ estimated useful lives once the assets are placed in service. AFUDC represents the composite interest cost of borrowed funds and a reasonable return on the equity funds used for construction for subsidiaries that apply the guidance for accounting for regulated operations. During 2010, 2011 and 2012, CERC capitalized interest and AFUDC of $7 million, less than $1 million and $2 million, respectively.

(h) Income Taxes

CERC is included in the consolidated income tax returns of CenterPoint Energy. CERC calculates its income tax provision on a separate return basis under a tax sharing agreement with CenterPoint Energy. CERC uses the asset and liability method of accounting for deferred income taxes in accordance with accounting guidance for income taxes. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. A valuation allowance is established against deferred tax assets for which management believes realization is not considered to be more likely than not. Current federal and certain state income taxes are payable to or receivable from CenterPoint Energy. CERC recognizes interest and penalties as a component of income tax expense.

(i) Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are recorded at the invoiced amount and do not bear interest. It is the policy of management to review the outstanding accounts receivable monthly, as well as the bad debt write-offs experienced in the past, and establish an allowance for doubtful accounts. Account balances are charged off against the allowance when management determines it is probable the receivable will not be recovered. Accounts receivable are net of an allowance for doubtful accounts of $24 million and $23 million at December 31, 2011 and 2012, respectively. The provision for doubtful accounts in CERC’s Statements of Consolidated Income for 2010, 2011 and 2012 was $30 million, $25 million and $15 million, respectively.

(j) Inventory

Inventory consists principally of materials and supplies and natural gas. Materials and supplies are valued at the lower of average cost or market. Materials and supplies are recorded to inventory when purchased and subsequently charged to expense or capitalized to plant when installed. Natural gas inventories of CERC’s Competitive Natural Gas Sales and Services business segment are also primarily valued at the lower of average cost or market. Natural gas inventories of CERC’s Natural Gas Distribution business segment are primarily valued at weighted average cost.  During 2011 and 2012, CERC recorded $11 million and $4 million, respectively, in write-downs of natural gas inventory to the lower of average cost or market.

	December 31,
	2011		2012
	(in millions)
Materials and supplies	$	86	$	83
Natural gas	187		145
Total inventory	$	273	$	228

(k) Derivative Instruments

CERC is exposed to various market risks. These risks arise from transactions entered into in the normal course of business.  CERC utilizes derivative instruments such as physical forward contracts, swaps and options to mitigate the impact of changes in commodity prices and weather on its operating results and cash flows. Such derivatives are recognized in CERC's Consolidated Balance Sheets at their fair value unless CERC elects the normal purchase and sales exemption for qualified physical transactions. A derivative may be designated as a normal purchase or normal sale if the intent is to physically receive or deliver the product for use or sale in the normal course of business.

CenterPoint Energy has a Risk Oversight Committee composed of corporate and business segment officers that oversees all commodity price, weather and credit risk activities, including CERC's marketing, risk management services and hedging activities. The committee’s duties are to establish CERC's commodity risk policies, allocate board-approved commercial risk limits, approve use of new products and commodities, monitor positions and ensure compliance with CERC's risk management policies and procedures and limits established by CenterPoint Energy’s board of directors.

CERC's policies prohibit the use of leveraged financial instruments. A leveraged financial instrument, for this purpose, is a transaction involving a derivative whose financial impact will be based on an amount other than the notional amount or volume of the instrument.

(l) Environmental Costs

CERC expenses or capitalizes environmental expenditures, as appropriate, depending on their future economic benefit. CERC expenses amounts that relate to an existing condition caused by past operations that do not have future economic benefit. CERC records undiscounted liabilities related to these future costs when environmental assessments and/or remediation activities are probable and the costs can be reasonably estimated.

(m) Statements of Consolidated Cash Flows

For purposes of reporting cash flows, CERC considers cash equivalents to be short-term, highly-liquid investments with maturities of three months or less from the date of purchase.

(n) New Accounting Pronouncements

Management believes the impact of recently issued standards, which are not yet effective, will not have a material impact on CERC's consolidated financial position, results of operations or cash flows upon adoption.

(o) Other Current Assets and Liabilities

Included in other current assets on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $17 million and $12 million, respectively, of margin deposits and $63 million and $86 million, respectively of under-recovered gas cost. Included in other current liabilities on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $14 million and $6 million, respectively, of over-recovered gas cost.

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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Money Pool Borrowings	$ 779	$ 383
Money Pool Borrowings Weighted-Average Interest Rate	0.10%
Net interest expense related to affiliate borrowings	4	1	2
Corporate services charge	163	164	154
Dividends paid to parent	$ 0	$ 0	$ 0

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following tables present information about CERC’s assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of December 31, 2011 and 2012, and indicate the fair value hierarchy of the valuation techniques utilized by CERC to determine such fair value.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2011
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		112		10		(16		)	107
Total assets	$	13	$	112	$	10	$	(16	)	$	119
Liabilities
Natural gas derivatives	$	19	$	101	$	4	$	(72	)	$	52
Total liabilities	$	19	$	101	$	4	$	(72	)	$	52

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $56 million posted with the same counterparties.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2012
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		40		7		(6		)	42
Total assets	$	13	$	40	$	7	$	(6	)	$	54
Liabilities
Natural gas derivatives	$	5	$	21	$	5	$	(15	)	$	16
Total liabilities	$	5	$	21	$	5	$	(15	)	$	16

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $9 million posted with the same counterparties.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following tables present additional information about assets or liabilities, including derivatives that are measured at fair value on a recurring basis for which CERC has utilized Level 3 inputs to determine fair value:

	Fair Value Measurements Using Significant  Unobservable Inputs (Level 3)
	Derivative assets and liabilities, net
	Year Ended December 31,
	2010			2011			2012
	(in millions)
Beginning balance	$	(6	)	$	3		$	6
Total gains or (losses):
Included in earnings	4			6			3
Included in regulatory assets	(1		)	—			—
Total settlements:
Included in earnings	(2		)	(3		)	(6		)
Included in regulatory assets	8			—			—
Total purchases	—			2			—
Transfers out of Level 3(1)	—			(2		)	(1		)
Ending balance	$	3		$	6		$	2
The amount of total gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$	4		$	5		$	1

Fair Value, by Balance Sheet Grouping [Table Text Block]

The fair values of cash and cash equivalents and short-term borrowings are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below. Non-trading derivative assets and liabilities are stated at fair value and are excluded from the table below. The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by the market price.

	December 31, 2011				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions)
Financial liabilities:
Long-term debt	$	2,919	$	3,272	$	2,641	$	3,094

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Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following tables present information about CERC’s derivative instruments and hedging activities. The first two tables provide a balance sheet overview of CERC’s Derivative Assets and Liabilities as of December 31, 2011 and 2012, while the last table provides a breakdown of the related income statement impacts for the years ending December 31, 2011 and 2012.

Fair Value of Derivative Instruments
	December 31, 2011
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	88	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	20		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	15		110
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	—		13
Total		$	123	$	124

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 633 billion cubic feet (Bcf) or a net 84 Bcf long position.  Of the net long position, basis swaps constitute 74 Bcf and volumes associated with price stabilization activities of the Natural Gas Distribution business segment constitute 6 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $55 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $56 million.

Fair Value of Derivative Instruments
	December 31, 2012
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	37	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	6		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	5		27
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	1		4
Total		$	49	$	32

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 489 Bcf or a net 101 Bcf long position.  Of the net long position, basis swaps constitute 73 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $26 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $9 million.

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

For CERC’s price stabilization activities of the Natural Gas Distribution business segment, the settled costs of derivatives are ultimately recovered through purchased gas adjustments. Accordingly, the net unrealized gains and losses associated with these contracts are recorded as net regulatory assets. Realized and unrealized gains and losses on other derivatives are recognized in the Statements of Consolidated Income as revenue for retail sales derivative contracts and as natural gas expense for financial natural gas derivatives and non-retail related physical natural gas derivatives.

Income Statement Impact of Derivative Activity
		Year Ended December 31,
Total derivatives not designated as hedging instruments	Income Statement Location	2011			2012
		(in millions)
Natural gas derivatives	Gains (Losses) in Revenue	$	102		$	43
Natural gas derivatives (1)	Gains (Losses) in Expense: Natural Gas	(144		)	(63		)
Total		$	(42	)	$	(20	)

 ________________

(1) The Gains (Losses) in Expense: Natural Gas includes $(107) million and $(38) million of costs in 2011 and 2012, respectively, associated with price stabilization activities of the Natural Gas Distribution business segment that will be ultimately recovered through purchased gas adjustments.

Credit Quality Of Counterparties

In addition to the risk associated with price movements, credit risk is also inherent in CERC’s non-trading derivative activities. Credit risk relates to the risk of loss resulting from non-performance of contractual obligations by a counterparty. The following table shows the composition of counterparties to the non-trading derivative assets of CERC as of December 31, 2011 and 2012 (in millions):

	December 31, 2011				December 31, 2012
	Investment Grade(1)		Total		Investment Grade(1)		Total
Energy marketers	$	1	$	7	$	1	$	1
Financial institutions	—		—		—		—
Retail end users (2)	—		100		—		41
Total	$	1	$	107	$	1	$	42

 ________________

(1) “Investment grade” is primarily determined using publicly available credit ratings and considering credit support (such as parent company guaranties) and collateral, which encompass cash and standby letters of credit. For unrated counterparties, CERC determines a synthetic credit rating by performing financial statement analysis and considering contractual rights and restrictions and collateral.

(2) Retail end users represent customers who have contracted to fix the price of a portion of their physical gas requirements for future periods.

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Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 MMcf		Dec. 31, 2011 MMcf		Dec. 31, 2010
Derivative Assets Investment Grade Non Trading	$ 1	[1]	$ 1	[1]
Derivative Assets Non Trading	42		107
Increased (Decreased) Natural Gas Revenues From Unrealized Net Gains (Losses)	(68)		38		18
Increased (Decreased) Natural Gas Expense From Unrealized Net Losses (Gains)	(52)		30		14
Net Unrealized Gain (Loss)	(16)		8		4
Weather Hedges Gain Loss Recognized	8		(1)		0
Derivative gross volumes on natural gas contracts (in MMcf)	489,000		633,000
Net long position (in MMcf)	101,000		84,000
Amount of net long position constituted by basis swaps (in MMcf)	73,000		74,000
Amount of net long position comprised of price stabilization activities of the Natural Gas Distribution business segment (MMcf)			6,000
Total non-trading derivative assets and liabilities net of collateral	26		55
Collateral Netting	9		56
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(20)		(42)
Total fair value of derivative instruments that contain credit risk contingent features that are in a net liability position	5		39
Aggregate fair value of assets already posted as collateral	1		1
Credit risk contingent feature assets	5		38
Weather Hedge Maximum Payment Limit	11
Gains (Losses) in Revenue [Member] | Natural gas derivatives [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	43		102
Gains (Losses) in Expense: Natural Gas [Member] | Natural gas derivatives [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(63)	[2]	(144)	[2]
Costs associated with price stabilization activities of the Natural Gas Distribution business segment included in Expenses	(38)		(107)
Energy Marketers [Member]
Derivative Assets Investment Grade Non Trading	1	[1]	1	[1]
Derivative Assets Non Trading	1		7
Financial Institutions [Member]
Derivative Assets Investment Grade Non Trading	0	[1]	0	[1]
Derivative Assets Non Trading	0		0
Retail End Users [Member]
Derivative Assets Investment Grade Non Trading	0	[1],[3]	0	[1],[3]
Derivative Assets Non Trading	41	[3]	100	[3]
Not Designated as Hedging Instrument [Member]
Derivative Assets Fair Value	49	[4],[5]	123	[6],[7]
Derivative Liabilities Fair Value	32	[4],[5]	124	[6],[7]
Not Designated as Hedging Instrument [Member] | Current Assets [Member] | Natural gas derivatives [Member]
Derivative Assets Fair Value	37	[4],[5],[8]	88	[6],[7],[8]
Derivative Liabilities Fair Value	1	[4],[5],[8]	1	[6],[7],[8]
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Natural gas derivatives [Member]
Derivative Assets Fair Value	6	[4],[5],[8]	20	[6],[7],[8]
Derivative Liabilities Fair Value	0	[4],[5],[8]	0	[6],[7],[8]
Not Designated as Hedging Instrument [Member] | Current Liabilities [Member] | Natural gas derivatives [Member]
Derivative Assets Fair Value	5	[4],[5],[8]	15	[6],[7],[8]
Derivative Liabilities Fair Value	27	[4],[5],[8]	110	[6],[7],[8]
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Natural gas derivatives [Member]
Derivative Assets Fair Value	1	[4],[5],[8]	0	[6],[7],[8]
Derivative Liabilities Fair Value	$ 4	[4],[5],[8]	$ 13	[6],[7],[8]

[1] “Investment grade” is primarily determined using publicly available credit ratings and considering credit support (such as parent company guaranties) and collateral, which encompass cash and standby letters of credit. For unrated counterparties, CERC determines a synthetic credit rating by performing financial statement analysis and considering contractual rights and restrictions and collateral.

[2] The Gains (Losses) in Expense: Natural Gas includes $(107) million and $(38) million of costs in 2011 and 2012, respectively, associated with price stabilization activities of the Natural Gas Distribution business segment that will be ultimately recovered through purchased gas adjustments.

[3] Retail end users represent customers who have contracted to fix the price of a portion of their physical gas requirements for future periods.

[4] The net of total non-trading derivative assets and liabilities is a $26 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $9 million.

[5] The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 489 Bcf or a net 101 Bcf long position. Of the net long position, basis swaps constitute 73 Bcf.

[6] The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 633 billion cubic feet (Bcf) or a net 84 Bcf long position. Of the net long position, basis swaps constitute 74 Bcf and volumes associated with price stabilization activities of the Natural Gas Distribution business segment constitute 6 Bcf.

[7] The net of total non-trading derivative assets and liabilities is a $55 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $56 million.

[8] Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

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Short-term Borrowings and Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

	December 31, 2011					December 31, 2012
	Long-Term			Current(1)		Long-Term			Current(1)
	(in millions)
Short-term borrowings:
Inventory financing	$	—		$	62	$	—		$	38
Total short-term borrowings	—			62		—			38
Long-term debt:
Senior notes 4.50% to 7.875% due 2013 to 2041	2,693			—		2,328			365
Commercial paper (2)	285			—		—			—
Unamortized discount and premium	(59		)	—		(52		)	—
Total long-term debt	2,919			—		2,276			365
Total debt	$	2,919		$	62	$	2,276		$	403

________________

(1) Includes amounts due or exchangeable within one year of the date noted.

(2) Classified as long-term debt because the termination date of the facility that backstops the commercial paper is more than one year from the date noted.

Schedule of Line of Credit Facilities [Table Text Block]

Revolving Credit Facility.   As of December 31, 2011 and 2012, CERC had the following revolving credit facility and utilization of such facility (in millions):

December 31, 2011								December 31, 2012
Size of Facility		Loans		Letters of Credit		Commercial Paper		Size of Facility		Loans		Letters of Credit		Commercial Paper
$	950	$	—	$	—	$	285	$	950	$	—	$	—	$	—

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Income Tax Expense Disclosure

The components of CERC’s income tax expense were as follows:

	Year Ended December 31,
	2010			2011		2012
	(in millions)
Current income tax expense (benefit):
Federal	$	(38	)	$	34	$	—
State	17			9		1
Total current expense (benefit)	(21		)	43		1
Deferred income tax expense (benefit):
Federal	234			140		198
State	(26		)	4		47
Total deferred expense	208			144		245
Total income tax expense	$	187		$	187	$	246

Reconciliation Of Expected Federal Income Tax Expense To Actual

A reconciliation of the expected federal income tax expense using the federal statutory income tax rate to the actual income tax expense and resulting effective income tax rate is as follows:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Income before income taxes	$	487		$	503		$	383
Federal statutory income tax rate	35		%	35		%	35		%
Expected federal income tax expense	170			176			134
Increase (decrease) in tax expense resulting from:
State income tax expense (benefit), net of federal income tax	(6		)	9			31
Increase (decrease) in settled and uncertain income tax positions	5			1			(7		)
Tax law change in deductibility of retiree health care costs	18			—			—
Goodwill impairment	—			—			88
Other, net	—			1			—
Total	17			11			112
Total income tax expense	$	187		$	187		$	246
Effective tax rate	38.4		%	37.2		%	64.2		%

Income Tax Asset Liability Disclosure

The tax effects of temporary differences that give rise to significant portions of deferred tax assets and liabilities were as follows:

	December 31,
	2011			2012
	(in millions)
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	9		$	9
Other	(1		)	—
Total current deferred tax assets	8			9
Non-current:
Employee benefits	57			49
Loss and credit carryforwards	238			192
Regulatory liabilities, net	—			196
Other	60			51
Total non-current deferred tax assets before valuation allowance	355			488
Valuation allowance	(3		)	(2		)
Total non-current deferred tax assets, net of valuation allowance	352			486
Total deferred tax assets, net of valuation allowance	360			495
Deferred tax liabilities:
Current:
Deferred gas costs	—			25
Other	—			5
Total current deferred tax liabilities	—			30
Non-current:
Depreciation	1,696			2,033
Regulatory assets, net	17			—
Other	59			129
Total non-current deferred tax liabilities	1,772			2,162
Total deferred tax liabilities	1,772			2,192
Accumulated deferred income taxes, net	$	1,412		$	1,697

Uncertain Income Tax Positions

Uncertain Income Tax Positions. The following table reconciles the beginning and ending balance of CERC’s unrecognized tax benefits (expenses):

	December 31,
	2010			2011			2012
	(in millions)
Balance, beginning of year	$	6		$	11		$	8
Tax Positions related to prior years:
Additions	—			(1		)	—
Reductions	(2		)	(3		)	(27		)
Tax Positions related to current year:
Additions	7			1			—
Settlements	—			—			(1		)
Balance, end of year	$	11		$	8		$	(20	)

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Background

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Background and Basis of Presentation

Background

CenterPoint Energy Resources Corp. (CERC Corp., and, together with its subsidiaries, CERC), owns and operates natural gas distribution systems. Subsidiaries of CERC Corp. own interstate natural gas pipelines and gas gathering systems and provide various ancillary services. A wholly owned subsidiary of CERC offers variable and fixed-price physical natural gas supplies primarily to commercial and industrial customers and electric and gas utilities. CERC Corp. is a Delaware corporation.

CERC Corp. is an indirect wholly owned subsidiary of CenterPoint Energy, Inc. (CenterPoint Energy), a public utility holding company.

For a description of CERC's reportable business segments, see Note 14.

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Operating Leases of Lessee Disclosure [Table Text Block]

The following table sets forth information concerning CERC’s obligations under non-cancelable long-term operating leases at December 31, 2012, which primarily consist of rental agreements for building space, data processing equipment, compression equipment and rights of way (in millions):

2013	$	12
2014	8
2015	5
2016	5
2017	3
2018 and beyond	13
Total	$	46

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Employee Benefit Plans Pension and Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Pension and Savings Plan
New percentage of eligible earnings used to determine retirement benefits (in hundredths)	5.00%
Pension Expense	$ 32		$ 30		$ 34
Non Qualified Pension Plan Benefit Expense	2		2		1
Non Qualified Pension Plan Expense	1		1		1
Maximum Percentage Of Employee Compensation Eligible For Contribution To Savings Plan	50.00%
Description Of Company Match Under Savings Plan	100% of the first 6% of each employee’s compensation contributed
Savings Plan Benefit Expense	18		17		16
Components of net periodic benefit cost
Service cost - benefits earned during the period	1		1		1
Interest cost on accumulated benefit obligation	5		6		7
Expected return on plan assets	(1)		(1)		(1)
Amortization of prior service cost	2		2		2
Amortization of net loss	3		1		0
Net postretirement benefit cost	10		9		9
Assumptions used to determine net postretirement benefit costs
Discount rate	4.80%		5.20%		5.70%
Expected return on plan assets	3.10%		4.50%		4.50%
Change in Plan Assets [Roll Forward]
Plan assets, beginning of year	22
Plan assets, end of year	24		22
Amounts Recognized in Balance Sheets
Other liabilities - benefit obligations	(122)		(108)
Actuarial Assumptions
Healthcare cost trend rate assumed for the next year	9.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Support, Methodology and Source Data	one-half to 99 years.
Amounts recognized in accumulated other comprehensive loss
Unrecognized actuarial loss	20		28
Unrecognized prior service cost	2		4
Total recognized in accumulated other comprehensive loss	22		32
Less deferred tax benefit	(21)	[1]	(25)	[1]
Net amount recognized in accumulated other comprehensive loss	1		7
Changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	(8)
Amortization of prior service cost	(2)
Total recognized in other comprehensive income	(10)
Total expense recognized in net periodic cost and other comprehensive income	0
Amounts that will be amortized from accumulated other comprehensive loss in next fiscal year
Unrecognized actuarial loss	1
Unrecognized prior service cost	1
Amounts in accumulated other comprehensive loss to be recognized as net periodic cost	2
Effect of a one-percentage point change in assumed healthcare cost trend rates
Effect of One Percentage Point Increase on Postretirement Benefit Obligation	4
Effect of One Percentage Point Increase on Total of Service and Interest Cost	0
Effect of One Percentage Point Decrease on Postretirement Benefit Obligation	(3)
Effect of One Percentage Point Decrease on Total of Service and Interest Cost	0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Accumulated benefit obligation, beginning of year	118		112
Service cost	1		1
Interest cost	5		6
Benefits paid	(13)		(14)
Participant contributions	4		4
Medicare reimbursement	2		2
Early retiree reinsurance program reimbursement	0		1
Actuarial Loss	16		6
Accumulated benefit obligation, end of year	133		118
Change in Plan Assets [Roll Forward]
Plan assets, beginning of year	22		22
Benefits paid	(13)		(14)
Employer contributions	9		9
Participant contributions	4		4
Actual investment return	2		1
Plan assets, end of year	24		22
Amounts Recognized in Balance Sheets
Current liabilities - other	(7)		(7)
Other liabilities - benefit obligations	(102)		(89)
Net liability, end of year	$ (109)		$ (96)
Actuarial Assumptions
Discount rate	3.90%		4.80%
Expected long-term return on assets	3.10%		3.10%
Healthcare cost trend rate assumed for the next year	9.00%		8.00%
Prescription cost trend rate assumed for the next year	9.00%		8.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50%		5.50%
Year that the healthcare rate reaches the ultimate trend rate	2017		2017
Year that the prescription drug rate reaches the ultimate trend rate	2017		2017

[1] CERC’s postretirement benefit obligation is reduced by the impact of previously non-taxable government subsidies under the Medicare Prescription Drug Act. Because the subsidies were non-taxable, the temporary difference used in measuring the deferred tax impact was determined on the unrecognized losses excluding such subsidies.

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STATEMENTS OF CONSOLIDATED INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 4,901	$ 6,102	$ 6,569
Expenses:
Natural gas	2,873	4,055	4,574
Operation and maintenance	951	964	913
Depreciation and amortization	285	262	248
Taxes other than income taxes	146	159	167
Goodwill impairment	252	0	0
Total	4,507	5,440	5,902
Operating Income	394	662	667
Other Income (Expense):
Interest and other finance charges	(179)	(190)	(208)
Equity in earnings of unconsolidated affiliates	31	30	29
Step acquisition gain	136	0	0
Other, net	1	1	(1)
Total	(11)	(159)	(180)
Income Before Income Taxes	383	503	487
Income tax expense	246	187	187
Net Income	$ 137	$ 316	$ 300

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Fair Value Measurements (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Assets
Corporate equities	$ 1,000,000		$ 1,000,000
Investments, including money market funds	11,000,000		11,000,000
Natural gas derivatives, assets	42,000,000		107,000,000
Total assets	54,000,000		119,000,000
Liabilities
Natural gas derivatives, liabilities	16,000,000		52,000,000
Total liabilities	16,000,000		52,000,000
Cash collateral posted with counterparties	9,000,000		56,000,000
Carrying Amount [Member]
Liabilities
Long-term debt	2,641,000,000		2,919,000,000
Fair Value [Member]
Liabilities
Long-term debt	3,094,000,000		3,272,000,000
Derivative Financial Instruments Assets And Liabilities Net Member
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward
Beginning balance	6,000,000		3,000,000		(6,000,000)
Total Gains Or Losses:
Included in earnings	3,000,000		6,000,000		4,000,000
Included in regulatory assets	0		0		(1,000,000)
Total settlements:
Included in earnings	(6,000,000)		(3,000,000)		(2,000,000)
Included in regulatory assets	0		0		8,000,000
Total purchases	0		2,000,000		0
Transfers out of Level 3	(1,000,000)	[1]	(2,000,000)	[1]	0	[1]
Ending balance	2,000,000		6,000,000		3,000,000
Amount Of Total Gains For Period Included In Earnings	1,000,000		5,000,000		4,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Corporate equities	1,000,000		1,000,000
Investments, including money market funds	11,000,000		11,000,000
Natural gas derivatives, assets	1,000,000		1,000,000
Total assets	13,000,000		13,000,000
Liabilities
Natural gas derivatives, liabilities	5,000,000		19,000,000
Total liabilities	5,000,000		19,000,000
Significant Other Observable Inputs (Level 2) [Member]
Assets
Corporate equities	0		0
Investments, including money market funds	0		0
Natural gas derivatives, assets	40,000,000		112,000,000
Total assets	40,000,000		112,000,000
Liabilities
Natural gas derivatives, liabilities	21,000,000		101,000,000
Total liabilities	21,000,000		101,000,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Illiquid forward price low range	3.07
Illiquid forward price high range	4.79
Option volatilities low range	0.00%
Option volatilities high range	58.00%
Assets
Corporate equities	0		0
Investments, including money market funds	0		0
Natural gas derivatives, assets	7,000,000		10,000,000
Total assets	7,000,000		10,000,000
Liabilities
Natural gas derivatives, liabilities	5,000,000		4,000,000
Total liabilities	5,000,000		4,000,000
Netting Adjustments [Member]
Assets
Corporate equities	0	[2]	0	[3]
Investments, including money market funds	0	[2]	0	[3]
Natural gas derivatives, assets	(6,000,000)	[2]	(16,000,000)	[3]
Total assets	(6,000,000)	[2]	(16,000,000)	[3]
Liabilities
Natural gas derivatives, liabilities	(15,000,000)	[2]	(72,000,000)	[3]
Total liabilities	$ (15,000,000)	[2]	$ (72,000,000)	[3]

[1] During 2010, 2011 and 2012, CERC did not have material Level 3 sales or significant transfers into Level 3.

[2] Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $9 million posted with the same counterparties.

[3] Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $56 million posted with the same counterparties.

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STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows from Operating Activities:
Net Income	$ 137	$ 316	$ 300
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	285	262	248
Amortization of deferred financing costs	13	13	9
Deferred income taxes	245	144	208
Goodwill impairment	252	0	0
Step acquisition gain	(136)	0	0
Write-down of natural gas inventory	4	11	6
Equity in earnings of unconsolidated affiliates, net of distributions	8	8	13
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net.	6	67	120
Accounts receivable/payable, affiliates	5	(14)	6
Inventory	41	20	(52)
Taxes receivable	1	62	(16)
Accounts payable	2	(101)	(35)
Fuel cost recovery	(52)	(70)	(9)
Interest and taxes accrued	(11)	6	5
Non-trading derivatives, net	19	(10)	(5)
Margin deposits, net.	53	34	7
Other current assets	(10)	11	(20)
Other current liabilities	8	(12)	(14)
Other assets	(13)	(3)	(7)
Other liabilities	(28)	22	(21)
Other, net	7	3	(21)
Net cash provided by operating activities	836	769	722
Cash Flows from Investing Activities:
Capital expenditures, net of acquisitions	(566)	(644)	(917)
Acquisitions, net of cash acquired	(360)	0	0
Investment in unconsolidated affiliates	(5)	(12)	(18)
Other, net	8	10	20
Net cash used in investing activities	(923)	(646)	(915)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings, net	(24)	9	(2)
Proceeds from (payments of) commercial paper, net	(285)	102	183
Proceeds from long-term debt	0	550	0
Payments of long-term debt	0	(606)	(45)
Cash paid for debt exchange	0	(58)	0
Debt issuance costs	0	(14)	0
Increase (decrease) in notes payable to affiliates	396	(106)	57
Net cash provided by (used in) financing activities	87	(123)	193
Net Decrease in Cash and Cash Equivalents	0	0	0
Cash and Cash Equivalents at Beginning of the Year	1	1	1
Cash and Cash Equivalents at End of the Year	1	1	1
Cash Payments:
Interest, net of capitalized interest	163	177	191
Income taxes (refunds), net	3	(20)	141
Non-cash transactions:
Accounts payable related to capital expenditures	$ 60	$ 53	$ 98

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Schedule II Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

CENTERPOINT ENERGY RESOURCES CORP. AND SUBSIDIARIES

(An Indirect Wholly Owned Subsidiary of CenterPoint Energy, Inc.)

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

For the Three Years Ended December 31, 2012

Column A	Column B		Column C					Column D		Column E
Description	Balance at Beginning of Period		Additions					Deductions From Reserves (1)		Balance at End of Period
			Charged to Income			Charged to Other Accounts
	(in millions)
Year Ended December 31, 2012:
Accumulated provisions:
Uncollectible accounts receivable	$	24	$	15		$	—	$	16	$	23
Deferred tax asset valuation allowance	3		(1		)	—		—		2
Year Ended December 31, 2011:
Accumulated provisions:
Uncollectible accounts receivable	$	25	$	25		$	—	$	26	$	24
Deferred tax asset valuation allowance	3		—			—		—		3
Year Ended December 31, 2010:
Accumulated provisions:
Uncollectible accounts receivable	$	23	$	30		$	—	$	28	$	25
Deferred tax asset valuation allowance	5		(2		)	—		—		3

________________

(1) Deductions from reserves represent losses or expenses for which the respective reserves were created. In the case of the uncollectible accounts reserve, such deductions are net of recoveries of amounts previously written off.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies [Abstract]

Use Of Estimates

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Principles of Consolidation

Principles of Consolidation

The accounts of CERC Corp. and its wholly owned and majority owned subsidiaries are included in CERC's consolidated financial statements. All intercompany transactions and balances are eliminated in consolidation. CERC uses the equity method of accounting for investments in entities in which CERC has an ownership interest between 20% and 50% and exercises significant influence.

CERC’s investments in unconsolidated affiliates include a 50% ownership interest in Southeast Supply Header, LLC (SESH), which owns and operates a 274-mile interstate natural gas pipeline.

Prior to July 2012, CERC owned a 50% interest in Waskom Gas Processing Company (Waskom), a Texas general partnership, which owns and operates a natural gas processing plant and natural gas gathering assets. During 2010, CERC invested $20 million in Waskom. On July 31, 2012, CERC purchased the 50% interest that it did not already own in Waskom, as well as other gathering and related assets from a third-party for approximately $273 million. The amount of the purchase price allocated to the acquisition of the 50% interest in Waskom was approximately $201 million, with the remaining purchase price allocated to the other gathering assets, based on a discounted cash flow methodology. The $273 million purchase price was allocated as follows: $253 million to property, plant and equipment; $16 million to goodwill; and the remaining balance to other assets and liabilities. The purchase of the 50% interest in Waskom was determined to be a business combination achieved in stages, and as such CERC recorded a pre-tax gain of approximately $136 million on July 31, 2012, which is the result of remeasuring CERC's original 50% interest in Waskom to fair value. As a result of the purchase, CERC recorded goodwill of $24 million, which includes $17 million related to Waskom (including the re-measurement of its existing 50% interest) and $7 million related to the other gathering and related assets.

Other investments, excluding marketable securities, are carried at cost.

Revenues

Revenues

CERC records revenue for natural gas sales and services under the accrual method and these revenues are recognized upon delivery to customers. Natural gas sales not billed by month-end are accrued based upon estimated purchased gas volumes, estimated lost and unaccounted for gas and currently effective tariff rates. The Interstate Pipelines and Field Services business segments record revenues as transportation and processing services are provided.

Long-lived Assets and Intangibles

Long-lived Assets and Intangibles

CERC records property, plant and equipment at historical cost. CERC expenses repair and maintenance costs as incurred. CERC periodically evaluates long-lived assets, including property, plant and equipment, and specifically identifiable intangibles, when events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. The determination of whether an impairment has occurred is based on an estimate of undiscounted cash flows attributable to the assets, compared to the carrying value of the assets.

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

CERC applies the guidance for accounting for regulated operations to the Natural Gas Distribution business segment and to portions of the Interstate Pipelines business segment. CERC’s rate-regulated businesses recognize removal costs as a component of depreciation expense in accordance with regulatory treatment. As of both December 31, 2011 and 2012, these removal costs of $573 million are classified as regulatory liabilities in the Consolidated Balance Sheets.  In addition, a portion of the amount of removal costs that relate to asset retirement obligations has been reclassified from a regulatory liability to an asset retirement liability in accordance with accounting guidance for conditional asset retirement obligations.

Depreciation and Amortization Expense

Depreciation and Amortization Expense

Depreciation and amortization is computed using the straight-line method based on economic lives or regulatory-mandated recovery periods. Amortization expense includes amortization of regulatory assets and other intangibles.

Capitalization of Interest and Allowance for Funds Used During Construction

Capitalization of Interest and Allowance for Funds Used During Construction

Interest and allowance for funds used during construction (AFUDC) are capitalized as a component of projects under construction and are amortized over the assets’ estimated useful lives once the assets are placed in service. AFUDC represents the composite interest cost of borrowed funds and a reasonable return on the equity funds used for construction for subsidiaries that apply the guidance for accounting for regulated operations. During 2010, 2011 and 2012, CERC capitalized interest and AFUDC of $7 million, less than $1 million and $2 million, respectively.

Income Taxes

Income Taxes

CERC is included in the consolidated income tax returns of CenterPoint Energy. CERC calculates its income tax provision on a separate return basis under a tax sharing agreement with CenterPoint Energy. CERC uses the asset and liability method of accounting for deferred income taxes in accordance with accounting guidance for income taxes. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. A valuation allowance is established against deferred tax assets for which management believes realization is not considered to be more likely than not. Current federal and certain state income taxes are payable to or receivable from CenterPoint Energy. CERC recognizes interest and penalties as a component of income tax expense.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are recorded at the invoiced amount and do not bear interest. It is the policy of management to review the outstanding accounts receivable monthly, as well as the bad debt write-offs experienced in the past, and establish an allowance for doubtful accounts. Account balances are charged off against the allowance when management determines it is probable the receivable will not be recovered. Accounts receivable are net of an allowance for doubtful accounts of $24 million and $23 million at December 31, 2011 and 2012, respectively. The provision for doubtful accounts in CERC’s Statements of Consolidated Income for 2010, 2011 and 2012 was $30 million, $25 million and $15 million, respectively.

Inventory

Inventory

Inventory consists principally of materials and supplies and natural gas. Materials and supplies are valued at the lower of average cost or market. Materials and supplies are recorded to inventory when purchased and subsequently charged to expense or capitalized to plant when installed. Natural gas inventories of CERC’s Competitive Natural Gas Sales and Services business segment are also primarily valued at the lower of average cost or market. Natural gas inventories of CERC’s Natural Gas Distribution business segment are primarily valued at weighted average cost.  During 2011 and 2012, CERC recorded $11 million and $4 million, respectively, in write-downs of natural gas inventory to the lower of average cost or market.

Derivative Instruments

Derivative Instruments

CERC is exposed to various market risks. These risks arise from transactions entered into in the normal course of business.  CERC utilizes derivative instruments such as physical forward contracts, swaps and options to mitigate the impact of changes in commodity prices and weather on its operating results and cash flows. Such derivatives are recognized in CERC's Consolidated Balance Sheets at their fair value unless CERC elects the normal purchase and sales exemption for qualified physical transactions. A derivative may be designated as a normal purchase or normal sale if the intent is to physically receive or deliver the product for use or sale in the normal course of business.

CenterPoint Energy has a Risk Oversight Committee composed of corporate and business segment officers that oversees all commodity price, weather and credit risk activities, including CERC's marketing, risk management services and hedging activities. The committee’s duties are to establish CERC's commodity risk policies, allocate board-approved commercial risk limits, approve use of new products and commodities, monitor positions and ensure compliance with CERC's risk management policies and procedures and limits established by CenterPoint Energy’s board of directors.

CERC's policies prohibit the use of leveraged financial instruments. A leveraged financial instrument, for this purpose, is a transaction involving a derivative whose financial impact will be based on an amount other than the notional amount or volume of the instrument.

Environmental Costs

Environmental Costs

CERC expenses or capitalizes environmental expenditures, as appropriate, depending on their future economic benefit. CERC expenses amounts that relate to an existing condition caused by past operations that do not have future economic benefit. CERC records undiscounted liabilities related to these future costs when environmental assessments and/or remediation activities are probable and the costs can be reasonably estimated.

Statement of Consolidated Cash Flows

Statements of Consolidated Cash Flows

For purposes of reporting cash flows, CERC considers cash equivalents to be short-term, highly-liquid investments with maturities of three months or less from the date of purchase.

New Accounting Pronouncements

New Accounting Pronouncements

Management believes the impact of recently issued standards, which are not yet effective, will not have a material impact on CERC's consolidated financial position, results of operations or cash flows upon adoption.

Other Current Assets and Liabilities

Other Current Assets and Liabilities

Included in other current assets on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $17 million and $12 million, respectively, of margin deposits and $63 million and $86 million, respectively of under-recovered gas cost. Included in other current liabilities on the Consolidated Balance Sheets at December 31, 2011 and 2012 were $14 million and $6 million, respectively, of over-recovered gas cost.

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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended		1 Months Ended
	Jul. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Southeast Supply Header Llc [Member]	Jul. 31, 2012 Waskom Gas Processing Company [Member]	Dec. 31, 2010 Waskom Gas Processing Company [Member]	Jun. 30, 2012 Waskom Gas Processing Company [Member]	Jul. 31, 2012 Waskom [Member]	Jul. 31, 2012 Gathering and Related Assets [Member]
Summary of Accounting Policies [Line Items]
Minimum Ownership Interest Percentage For Investments Recorded Using Entity Method		20.00%
Maximum Ownership Interest Percentage For Investments Recorded Using Entity Method		50.00%
Percentage of ownership interest					50.00%			50.00%
Length of Southeast Supply Header's interstate natural gas pipeline (in miles)		274
Investment during the period in Waskom							$ 20
Percentage of Ownership in Affiliate 2 Acquired						50.00%
Business Acquisition, Purchase Price Allocation, Remaining Interest	201
Business Acquisition, Cost of Acquired Entity, Cash Paid	273
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	253
Business Acquisition, Purchase Price Allocation, Goodwill Amount	16
Step acquisition gain	136	136	0	0
Acquisition	24	24							17	7
Allowance for doubtful accounts		23	24
Provision for doubtful accounts		15	25	30
Amount of removal costs recognized as a component of depreciation expense recorded as a regulatory liability		573	573
Amount of capitalized interest and allowance for funds used during construction		(2)	(1)	(7)
Write-downs of natural gas inventory to lower of cost or market		4	11
Materials and supplies		83	86
Natural gas		145	187
Total inventory		228	273
Margin deposits		12	17
Under Recovered Gas Costs		86	63
Over Recovered Gas Costs		$ 6	$ 14

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment includes the following:

	Weighted Average Useful Lives	December 31,
	(Years)	2011		2012
		(in millions)
Natural Gas Distribution	32	$	3,959	$	4,321
Competitive Natural Gas Sales and Services	26	76		80
Interstate Pipelines	56	2,675		2,803
Field Services	42	1,754		2,359
Other property	12	55		52
Total		8,519		9,615
Accumulated depreciation and amortization:
Natural Gas Distribution		1,069		1,194
Competitive Natural Gas Sales and Services		20		25
Interstate Pipelines		302		355
Field Services		72		118
Other property		26		22
Total accumulated depreciation and amortization		1,489		1,714
Property, plant and equipment, net		$	7,030	$	7,901

Depreciation And Amortization [Table Text Block]

The following table presents depreciation and amortization expense for 2010, 2011 and 2012:

	Year Ended December 31,
	2010		2011		2012
	(in millions)
Depreciation expense	$	232	$	244	$	267
Amortization expense	16		18		18
Total depreciation and amortization expense	$	248	$	262	$	285

Asset Retirement Obligations

A reconciliation of the changes in the asset retirement obligation (ARO) liability is as follows (in millions):

	December 31,
	2011		2012
Beginning balance	$	58	$	132
Accretion expense	3		6
Revisions in estimates of cash flows	71		(3		)
Ending balance	$	132	$	135

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STATEMENTS OF CONSOLIDATED STOCKHOLDER'S EQUITY (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2009		$ 0	$ 2,416	$ 1,065
Balance (in shares) at Dec. 31, 2009		1,000
Adjustment to pension and postretirement plans					(5)
Net Income	300			300
Balance at Dec. 31, 2010	3,776	0	2,416	1,365	(5)
Balance (in shares) at Dec. 31, 2010		1,000
Adjustment to pension and postretirement plans					(7)
Net Income	316			316
Balance at Dec. 31, 2011	4,090	0	2,416	1,681	(7)
Balance (in shares) at Dec. 31, 2011		1,000
Balance at Sep. 30, 2011
Adjustment to pension and postretirement plans					(7)
Net Income	93
Balance at Dec. 31, 2011	4,090	0	2,416	1,681	(7)
Balance (in shares) at Dec. 31, 2011		1,000
Adjustment to pension and postretirement plans					(1)
Net Income	137			137
Balance at Dec. 31, 2012	4,233	0	2,416	1,818	1
Balance (in shares) at Dec. 31, 2012		1,000
Balance at Sep. 30, 2012
Adjustment to pension and postretirement plans					(1)
Net Income	104
Balance at Dec. 31, 2012	$ 4,233	$ 0	$ 2,416		$ 1
Balance (in shares) at Dec. 31, 2012		1,000

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Statements of Consolidated Comprehensive Income (Parenthetical) (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Adjustment to Pension and Other Postretirement Plans, Tax	$ 5	$ 1	$ 1

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Short-term Borrowings and Long-term Debt

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Short-term Borrowings and Long-term Debt

Short-term Borrowings and Long-term Debt

	December 31, 2011					December 31, 2012
	Long-Term			Current(1)		Long-Term			Current(1)
	(in millions)
Short-term borrowings:
Inventory financing	$	—		$	62	$	—		$	38
Total short-term borrowings	—			62		—			38
Long-term debt:
Senior notes 4.50% to 7.875% due 2013 to 2041	2,693			—		2,328			365
Commercial paper (2)	285			—		—			—
Unamortized discount and premium	(59		)	—		(52		)	—
Total long-term debt	2,919			—		2,276			365
Total debt	$	2,919		$	62	$	2,276		$	403

________________

(1) Includes amounts due or exchangeable within one year of the date noted.

(2) Classified as long-term debt because the termination date of the facility that backstops the commercial paper is more than one year from the date noted.

(a)Short-term Borrowings

Inventory Financing. Gas Operations has asset management agreements associated with its utility distribution service in Arkansas, north Louisiana and Oklahoma that extend through 2015. Pursuant to the provisions of the agreements, Gas Operations sells natural gas and agrees to repurchase an equivalent amount of natural gas during the winter heating seasons at the same cost, plus a financing charge. These transactions are accounted for as a financing and they had an associated principal obligation of $62 million and $38 million as of December 31, 2011 and 2012, respectively.

(b) Long-term Debt

Revolving Credit Facility.   As of December 31, 2011 and 2012, CERC had the following revolving credit facility and utilization of such facility (in millions):

December 31, 2011								December 31, 2012
Size of Facility		Loans		Letters of Credit		Commercial Paper		Size of Facility		Loans		Letters of Credit		Commercial Paper
$	950	$	—	$	—	$	285	$	950	$	—	$	—	$	—

CERC Corp.’s $950 million credit facility, which is scheduled to terminate September 9, 2016, can be drawn at the London Interbank Offered Rate plus 150 basis points based on CERC Corp.’s current credit ratings. The facility contains a debt to total capitalization covenant, limiting debt to 65% of its total capitalization. CERC Corp. was in compliance with all debt covenants as of December 31, 2012.

Maturities.  CERC’s consolidated maturities of long-term debt are $365 million in 2013, $160 million in 2014, $-0- in 2015, $325 million in 2016 and $250 million in 2017.

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Document And Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	CENTERPOINT ENERGY RESOURCES CORP
Entity Central Index Key	0001042773
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float		$ 0
Entity Common Stock, Shares Outstanding	1,000
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012

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Income Taxes

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Income Taxes

Income Taxes

The components of CERC’s income tax expense were as follows:

	Year Ended December 31,
	2010			2011		2012
	(in millions)
Current income tax expense (benefit):
Federal	$	(38	)	$	34	$	—
State	17			9		1
Total current expense (benefit)	(21		)	43		1
Deferred income tax expense (benefit):
Federal	234			140		198
State	(26		)	4		47
Total deferred expense	208			144		245
Total income tax expense	$	187		$	187	$	246

A reconciliation of the expected federal income tax expense using the federal statutory income tax rate to the actual income tax expense and resulting effective income tax rate is as follows:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Income before income taxes	$	487		$	503		$	383
Federal statutory income tax rate	35		%	35		%	35		%
Expected federal income tax expense	170			176			134
Increase (decrease) in tax expense resulting from:
State income tax expense (benefit), net of federal income tax	(6		)	9			31
Increase (decrease) in settled and uncertain income tax positions	5			1			(7		)
Tax law change in deductibility of retiree health care costs	18			—			—
Goodwill impairment	—			—			88
Other, net	—			1			—
Total	17			11			112
Total income tax expense	$	187		$	187		$	246
Effective tax rate	38.4		%	37.2		%	64.2		%

CERC recorded an effective tax rate of 64.2% for 2012 compared to 37.2% for 2011. The increase in the effective tax rate is primarily due to the goodwill impairment of $252 million which is non-deductible for tax in 2012 and higher state tax expense compared to 2011 related to benefits recognized in that prior period for lower blended state rates. The increased rate was partially offset by the release of income tax reserves of $7 million.

CERC recorded a net reduction in state income tax expense of approximately $20 million related to lower blended state tax rates and a reduction of the deferred tax liability recorded in December 2011.

CERC recorded a non-cash, $19 million increase to income tax expense in 2010 as a result of a change in tax law upon the enactment in March 2010 of the Patient Protection and Affordable Care Act and the related Health Care and Education Reconciliation Act of 2010. The change in tax law, which becomes effective for tax years beginning after December 31, 2012, eliminates the tax deductibility of the portion of retiree health care costs that are reimbursed by Medicare Part D subsidies. Based upon the actuarially determined net present value of lost future retiree health care deductions related to the subsidies, CERC reduced its deferred tax asset by approximately $22 million in March 2010. The portion of the reduction that CERC believes will be recovered through the regulatory process, or approximately $2 million, was recorded as an adjustment to regulatory assets. The regulatory assets were also increased in March 2010 by approximately $1 million related to the recovery of CERC’s income taxes. The remaining $19 million of the reduction in CERC’s deferred tax asset was recorded as a charge to income tax expense in the first quarter of 2010.

In December 2010, certain subsidiaries of CERC were restructured in order to achieve a more tax-efficient reporting structure. As a result of the restructuring, CERC recorded a net reduction in income tax expense of approximately $24 million related to the remeasurement of accumulated deferred income taxes. The net reduction in income tax expense is comprised of a decrease in state income tax expense, net of federal income tax, totaling approximately $29 million and an increase in income tax expense of approximately $5 million related to uncertain income tax positions.

The tax effects of temporary differences that give rise to significant portions of deferred tax assets and liabilities were as follows:

	December 31,
	2011			2012
	(in millions)
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	9		$	9
Other	(1		)	—
Total current deferred tax assets	8			9
Non-current:
Employee benefits	57			49
Loss and credit carryforwards	238			192
Regulatory liabilities, net	—			196
Other	60			51
Total non-current deferred tax assets before valuation allowance	355			488
Valuation allowance	(3		)	(2		)
Total non-current deferred tax assets, net of valuation allowance	352			486
Total deferred tax assets, net of valuation allowance	360			495
Deferred tax liabilities:
Current:
Deferred gas costs	—			25
Other	—			5
Total current deferred tax liabilities	—			30
Non-current:
Depreciation	1,696			2,033
Regulatory assets, net	17			—
Other	59			129
Total non-current deferred tax liabilities	1,772			2,162
Total deferred tax liabilities	1,772			2,192
Accumulated deferred income taxes, net	$	1,412		$	1,697

CERC is included in the consolidated income tax returns of CenterPoint Energy. CERC calculates its income tax provision on a separate return basis under a tax sharing agreement with CenterPoint Energy.

Tax Attribute Carryforwards and Valuation Allowance.  At December 31, 2012, CERC has approximately $487 million of federal net operating loss carryforwards which begin to expire in 2031 and approximately $377 million of state net operating loss carryforwards which expire in various years between 2013 and 2032. CERC has approximately $1 million of federal capital loss carryforwards and $1 million of federal charitable contribution carryforwards which expire in various years between 2013 and 2032.

CERC has approximately $244 million of state capital loss carryforwards which expire in 2017 for which management established a full valuation allowance of $3 million state tax effect ($2 million net of federal income tax). The valuation allowance was established based upon management's evaluation that it may not be realized.

Uncertain Income Tax Positions. The following table reconciles the beginning and ending balance of CERC’s unrecognized tax benefits (expenses):

	December 31,
	2010			2011			2012
	(in millions)
Balance, beginning of year	$	6		$	11		$	8
Tax Positions related to prior years:
Additions	—			(1		)	—
Reductions	(2		)	(3		)	(27		)
Tax Positions related to current year:
Additions	7			1			—
Settlements	—			—			(1		)
Balance, end of year	$	11		$	8		$	(20	)

The net decrease in the total amount of unrecognized tax benefits during 2012 is primarily related to the re-measurement of certain unrecognized tax benefits related to an Internal Revenue Service (IRS) issuance of new guidance with respect to repairs on tangible property and CERC's IRS settlements for tax years 2006 through 2009. CERC does not expect the change to the amount of unrecognized tax benefits over the twelve months ending December 31, 2013 to materially impact the financial position of CERC.

CERC had approximately $5 million, $6 million and $-0- of unrecognized tax benefits that, if recognized, would affect the effective income tax rate for 2010, 2011and 2012, respectively. CERC recognizes interest and penalties as a component of income tax expense.  CERC recognized approximately $0.4 million of income tax expense, $0.4 million of income tax expense and $3 million of income tax benefit related to interest on uncertain income tax positions during 2010, 2011 and 2012, respectively. CERC had approximately $4 million and $7 million of interest receivable on uncertain income tax positions accrued at December 31, 2011 and 2012, respectively.

Tax Audits and Settlements.   CenterPoint Energy's consolidated federal income tax returns have been audited and settled through the 2009 tax year. CenterPoint Energy has filed claims for income tax refunds that are pending review by the IRS for tax years 2002, 2003 and 2004. CenterPoint Energy is currently under examination by the IRS for tax years 2010 and 2011 and is at various stages of the examination process. CERC has considered the effects of these examinations in its accrual for settled issues and liability for uncertain income tax positions as of December 31, 2012.

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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 137	$ 316	$ 300
Other comprehensive income (loss), net of tax:
Adjustment to pension and other postretirement plans (net of tax of $1, $1 and $5)	6	(2)	(1)
Other comprehensive income (loss)	6	(2)	(1)
Comprehensive income	$ 143	$ 314	$ 299

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Regulatory Matters

12 Months Ended

Dec. 31, 2012

Regulatory Matters [Abstract]

Regulatory Matters

Regulatory Matters

The following is a list of regulatory assets/liabilities reflected on CERC's Consolidated Balance Sheets as of December 31, 2011 and 2012:

	December 31,
	2011			2012
	(in millions)
Regulatory assets in other long-term assets (1)	$	97		$	105
Regulatory liabilities	(597		)	(619		)
Net	$	(500	)	$	(514	)

________________

(1) Regulatory assets that are not earning a return were not material at December 31, 2011 and 2012.

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Goodwill

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill Disclosure [Text Block]

Goodwill

Goodwill by reportable business segment as of December 31, 2011 and 2012 is as follows (in millions):

	December 31, 2011		Impairment Charge		Acquisition		December 31, 2012
Natural Gas Distribution	$	746	$	—	$	—	$	746
Interstate Pipelines	579		—		—		579
Competitive Natural Gas Sales and Services	335		252		—		83
Field Services	25		—		24		49
Other Operations	11		—		—		11
Total	$	1,696	$	252	$	24	$	1,468

CERC performs its goodwill impairment tests at least annually and evaluates goodwill when events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. The impairment evaluation for goodwill is performed by using a two-step process. In the first step, the fair value of each reporting unit is compared with the carrying amount of the reporting unit, including goodwill. The estimated fair value of the reporting unit is generally determined on the basis of discounted future cash flows. If the estimated fair value of the reporting unit is less than the carrying amount of the reporting unit, then a second step must be completed in order to determine the amount of the goodwill impairment that should be recorded. In the second step, the implied fair value of the reporting unit’s goodwill is determined by allocating the reporting unit’s fair value to all of its assets and liabilities other than goodwill (including any unrecognized intangible assets) in a manner similar to a purchase price allocation. The resulting implied fair value of the goodwill that results from the application of this second step is then compared to the carrying amount of the goodwill and an impairment charge is recorded for the difference.

CERC performed its annual impairment test in the third quarter of 2012 and determined that a non-cash goodwill impairment charge in the amount of $252 million was required for the Competitive Natural Gas Sales and Services reportable segment. CERC also determined that no impairment charge was required for any other reportable segment.

CERC estimated the value of the Competitive Natural Gas Sales and Services reporting unit using an income approach. Under this approach, the fair value of the reporting unit is determined by using the present value of future expected cash flows, which cash flows are based on management projections of revenue growth, gross margin, and overall market conditions. These estimated future cash flows are then discounted using a rate that approximates the weighted average cost of capital of a market participant.

The Competitive Natural Gas Sales and Services reporting unit fair value analysis resulted in an implied fair value of goodwill of $83 million for this reporting unit, and as a result, a non-cash impairment charge in the amount of $252 million was recorded in the third quarter of 2012. The adverse wholesale market conditions facing CERC’s energy services business, specifically the prospects for continued low geographic and seasonal price differentials for natural gas, led to a reduction in the estimate of the fair value of goodwill associated with this reporting unit.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies [Abstract]

Schedule of Inventory [Table Text Block]

	December 31,
	2011		2012
	(in millions)
Materials and supplies	$	86	$	83
Natural gas	187		145
Total inventory	$	273	$	228

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

(a) Natural Gas Supply Commitments

Natural gas supply commitments include natural gas contracts related to CERC’s Natural Gas Distribution and Competitive Natural Gas Sales and Services business segments, which have various quantity requirements and durations, that are not classified as non-trading derivative assets and liabilities in CERC’s Consolidated Balance Sheets as of December 31, 2011 and 2012 as these contracts meet the exception to be classified as "normal purchases contracts" or do not meet the definition of a derivative. Natural gas supply commitments also include natural gas transportation contracts that do not meet the definition of a derivative. As of December 31, 2012, minimum payment obligations for natural gas supply commitments are approximately $430 million in 2013, $344 million in 2014, $214 million in 2015, $149 million in 2016, $96 million in 2017 and $156 million after 2017.

(b) Asset Management Agreements

Gas Operations has asset management agreements associated with its utility distribution service in Arkansas, Louisiana, Mississippi, Oklahoma and Texas. Generally, these asset management agreements are contracts between Gas Operations and an asset manager that are intended to transfer the working capital obligation and maximize the utilization of the assets.  In these agreements, Gas Operations agreed to release transportation and storage capacity to other parties to manage gas storage, supply and delivery arrangements for Gas Operations and to use the released capacity for other purposes when it is not needed for Gas Operations. Gas Operations is compensated by the asset manager through payments made over the life of the agreements based in part on the results of the asset optimization. Under the provisions of these asset management agreements, Gas Operations has an obligation to purchase its winter storage requirements from the asset manager. The agreements have varying terms, the longest of which expires in 2016.

(c) Lease Commitments

The following table sets forth information concerning CERC’s obligations under non-cancelable long-term operating leases at December 31, 2012, which primarily consist of rental agreements for building space, data processing equipment, compression equipment and rights of way (in millions):

2013	$	12
2014	8
2015	5
2016	5
2017	3
2018 and beyond	13
Total	$	46

Total lease expense for all operating leases was $76 million, $42 million and $26 million in 2010, 2011 and 2012, respectively.

(d) Long-Term Gas Gathering and Treating Agreements

CenterPoint Energy Field Services, LLC (CEFS) has long-term agreements with an indirect wholly owned subsidiary of Encana Corporation (Encana) and an indirect wholly owned subsidiary of Royal Dutch Shell plc (Shell) to provide gathering and treating services for their natural gas production from certain Haynesville Shale and Bossier Shale formations in Texas and Louisiana.  

Under the long-term agreements, Encana or Shell may elect to require CEFS to expand the capacity of its gathering systems by up to an additional 1.3 Bcf per day.  CEFS estimates that the cost to expand the capacity of its gathering systems by an additional 1.3 Bcf per day would be as much as $440 million.  Encana and Shell would provide incremental volume commitments in connection with an election to expand system capacity.

(e) Legal, Environmental and Other Regulatory Matters

Legal Matters

Gas Market Manipulation Cases.  CenterPoint Energy, CenterPoint Houston or their predecessor, Reliant Energy, Incorporated (Reliant Energy), and certain of their former subsidiaries have been named as defendants in certain lawsuits described below. Under a master separation agreement between CenterPoint Energy and a former subsidiary, RRI Energy, Inc. (RRI), CenterPoint Energy and its subsidiaries are entitled to be indemnified by RRI and its successors for any losses, including attorneys’ fees and other costs, arising out of these lawsuits.  In May 2009, RRI sold its Texas retail business to a subsidiary of NRG Energy, Inc. (NRG) and RRI changed its name to RRI Energy, Inc. In December 2010, Mirant Corporation merged with and became a wholly owned subsidiary of RRI, and RRI changed its name to GenOn Energy, Inc. (GenOn). In December 2012, NRG acquired GenOn through a merger in which GenOn became a wholly owned subsidiary of NRG. None of the sale of the retail business, the merger with Mirant Corporation, or the acquisition of GenOn by NRG alters RRI’s (now GenOn’s) contractual obligations to indemnify CenterPoint Energy and its subsidiaries, including CenterPoint Houston, for certain liabilities, including their indemnification obligations regarding the gas market manipulation litigation, nor does it affect the terms of existing guaranty arrangements for certain GenOn gas transportation contracts discussed below.

A large number of lawsuits were filed against numerous gas market participants in a number of federal and western state courts in connection with the operation of the natural gas markets in 2000-2002. CenterPoint Energy’s former affiliate, RRI, was a participant in gas trading in the California and Western markets. These lawsuits, many of which were filed as class actions, allege violations of state and federal antitrust laws. Plaintiffs in these lawsuits are seeking a variety of forms of relief, including, among others, recovery of compensatory damages (in some cases in excess of $1 billion), a trebling of compensatory damages, full consideration damages and attorneys’ fees. CenterPoint Energy and/or Reliant Energy were named in approximately 30 of these lawsuits, which were instituted between 2003 and 2009. CenterPoint Energy and its affiliates have since been released or dismissed from all but two of such cases. CenterPoint Energy Services, Inc. (CES), a subsidiary of CERC Corp., is a defendant in a case now pending in federal court in Nevada alleging a conspiracy to inflate Wisconsin natural gas prices in 2000-2002.  In July 2011, the court issued an order dismissing the plaintiffs’ claims against the other defendants in the case, each of whom had demonstrated FERC jurisdictional sales for resale during the relevant period, based on federal preemption.  The plaintiffs have appealed this ruling to the United States Court of Appeals for the Ninth Circuit. Additionally, CenterPoint Energy was a defendant in a lawsuit filed in state court in Nevada that was dismissed in 2007, but in March 2010 the plaintiffs appealed the dismissal to the Nevada Supreme Court. In September 2012, the Nevada Supreme Court affirmed the dismissal. In October 2012, the Nevada Supreme Court granted the plaintiffs’ motion to stay the dismissal of this case pending the filing and final disposition of their petition for a writ of certiorari to the Supreme Court of the United States. In December 2012, the plaintiffs filed a petition for writ of certiorari with the Supreme Court of the United States. On January 4, 2013, the Supreme Court removed the case from its docket since the plaintiffs’ petition exceeded the applicable word limit. In February 2013, the plaintiffs filed a corrected petition with the Supreme Court. CenterPoint Energy believes that neither it nor CES is a proper defendant in these remaining cases and will continue to pursue dismissal from those cases.  CenterPoint Energy does not expect the ultimate outcome of these remaining matters to have a material impact on its financial condition, results of operations or cash flows.

Natural Gas Measurement Lawsuits. CERC Corp. and certain of its subsidiaries are defendants in two mismeasurement lawsuits brought against approximately 245 pipeline companies and their affiliates pending in state court in Stevens County, Kansas.  In one case (originally filed in May 1999 and amended four times), the plaintiffs purport to represent a class of royalty owners who allege that the defendants have engaged in systematic mismeasurement of the volume of natural gas for more than 25 years. The plaintiffs amended their petition in this suit in July 2003 in response to an order from the judge denying certification of the plaintiffs’ alleged class. In the amendment, the plaintiffs dismissed their claims against certain defendants (including two CERC Corp. subsidiaries), limited the scope of the class of plaintiffs they purport to represent and eliminated previously asserted claims based on mismeasurement of the Btu content of the gas. The same plaintiffs then filed a second lawsuit, again as representatives of a putative class of royalty owners in which they assert their claims that the defendants have engaged in systematic mismeasurement of the Btu content of natural gas for more than 25 years. In both lawsuits, the plaintiffs seek compensatory damages, along with statutory penalties, treble damages, interest, costs and fees.  In September 2009, the district court in Stevens County, Kansas, denied plaintiffs’ request for class certification of their case and, in March 2010, denied the plaintiffs’ request for reconsideration of that order.   In July 2012, the plaintiffs filed a motion to dismiss certain defendants from both lawsuits, including the remaining CERC Corp. defendants.

CERC believes that there has been no systematic mismeasurement of gas and that these lawsuits are without merit. CERC does not expect the ultimate outcome of the lawsuits to have a material impact on its financial condition, results of operations or cash flows.

Environmental Matters

Manufactured Gas Plant Sites. CERC and its predecessors operated manufactured gas plants (MGPs) in the past. In Minnesota, CERC has completed remediation on two sites, other than ongoing monitoring and water treatment. There are five remaining sites in CERC’s Minnesota service territory. CERC believes that it has no liability with respect to two of these sites.

As of December 31, 2012, CERC had recorded a liability of $14 million for remediation of these Minnesota sites. The estimated range of possible remediation costs for the sites CERC believes it has responsibility for was $6 million to $41 million based on remediation continuing for 30 to 50 years. The cost estimates are based on studies of a site or industry average costs for remediation of sites of similar size. The actual remediation costs will be dependent upon the number of sites to be remediated, the participation of other potentially responsible parties (PRPs), if any, and the remediation methods used. The Minnesota Public Utilities Commission includes approximately $285,000 annually in rates to fund normal on-going remediation costs.  As of December 31, 2012, CERC had collected $5.8 million from insurance companies to be used for future environmental remediation.

In addition to the Minnesota sites, the United States Environmental Protection Agency and other regulators have investigated MGP sites that were owned or operated by CERC or may have been owned by one of its former affiliates. CERC does not expect the ultimate outcome of these investigations will have a material adverse impact on the financial condition, results of operations or cash flows.

Asbestos.  Some facilities owned by CERC's predecessors contain or have contained asbestos insulation and other asbestos-containing materials. CERC or its predecessor companies have been named, along with numerous others, as a defendant in lawsuits filed by a number of individuals who claim injury due to exposure to asbestos. Some of the claimants have worked at locations owned by CERC, but most existing claims relate to facilities previously owned by CERC's subsidiaries. CERC anticipates that additional claims like those received may be asserted in the future.  Although their ultimate outcome cannot be predicted at this time, CERC intends to continue vigorously contesting claims that it does not consider to have merit and, based on its experience to date, does not expect these matters, either individually or in the aggregate, to have a material adverse effect on its financial condition, results of operations or cash flows.

Other Environmental.  From time to time CERC identifies the presence of environmental contaminants on property where it conducts or has conducted operations. Other such sites involving contaminants may be identified in the future.  CERC has remediated and expects to continue to remediate identified sites consistent with its legal obligations. From time to time CERC has received notices from regulatory authorities or others regarding its status as a PRP in connection with sites found to require remediation due to the presence of environmental contaminants. In addition, CERC has been named from time to time as a defendant in litigation related to such sites. Although the ultimate outcome of such matters cannot be predicted at this time, CERC does not expect, based on its experience to date, these matters, either individually or in the aggregate, to have a material adverse effect on its financial condition, results of operations or cash flows.

Other Proceedings

CERC is involved in other legal, environmental, tax and regulatory proceedings before various courts, regulatory commissions and governmental agencies regarding matters arising in the ordinary course of business. Some of these proceedings involve substantial amounts. CERC regularly analyzes current information and, as necessary, provides accruals for probable liabilities on the eventual disposition of these matters. CERC does not expect the disposition of these matters to have a material adverse effect on its financial condition, results of operations or cash flows.

(f) Guaranties

Prior to the distribution of CenterPoint Energy’s ownership in RRI to its shareholders, CERC had guaranteed certain contractual obligations of what became RRI’s trading subsidiary.  When the companies separated, RRI agreed to secure CERC against obligations under the guaranties RRI had been unable to extinguish by the time of separation.  Pursuant to such agreement, as amended in December 2007, RRI (now GenOn) agreed to provide to CERC cash or letters of credit as security against CERC’s obligations under its remaining guaranties for demand charges under certain gas transportation agreements if and to the extent changes in market conditions expose CERC to a risk of loss on those guaranties based on an annual calculation, with any required collateral to be posted each December.  The undiscounted maximum potential payout of the demand charges under these transportation contracts, which will be in effect until 2018, was approximately $73 million as of December 31, 2012. Based on market conditions in the fourth quarter of 2012 at the time the most recent annual calculation was made under the agreement, GenOn was not obligated to post any security. As a result, CERC returned to GenOn in the fourth quarter of 2012 the approximately $28 million of aggregate collateral previously posted by GenOn under the agreement.  If GenOn should fail to perform the contractual obligations, CERC could have to honor its guarantee and, in such event, any collateral then provided as security may be insufficient to satisfy CERC's obligations.

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Derivative Instruments

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

CERC is exposed to various market risks. These risks arise from transactions entered into in the normal course of business. CERC utilizes derivative instruments such as physical forward contracts, swaps and options to mitigate the impact of changes in commodity prices, weather and interest rates on its operating results and cash flows.

(a) Non-Trading Activities

Derivative Instruments. CERC enters into certain derivative instruments to manage physical commodity price risks and does not engage in proprietary or speculative commodity trading.  These financial instruments do not qualify or are not designated as cash flow or fair value hedges.

During the year ended December 31, 2010, CERC recorded increased natural gas revenues from unrealized net gains of $18 million and increased natural gas expense from unrealized net losses of $14 million, a net unrealized gain of $4 million. During the year ended December 31, 2011, CERC recorded increased natural gas revenues from unrealized net gains of $38 million and increased natural gas expense from unrealized net losses of $30 million, a net unrealized gain of $8 million. During the year ended December 31, 2012, CERC recorded decreased natural gas revenues from unrealized net losses of $68 million and decreased natural gas expense from unrealized net gains of $52 million, a net unrealized loss of $16 million.

Weather Hedges. CERC has weather normalization or other rate mechanisms that mitigate the impact of weather on its gas operations in Arkansas, Louisiana, Mississippi, Oklahoma and a portion of Texas. The remaining Gas Operations jurisdictions do not have such mechanisms. As a result, fluctuations from normal weather may have a significant positive or negative effect on the results of the gas operations in the remaining jurisdictions. CERC enters into heating-degree day swaps to mitigate the effect of fluctuations from normal weather on its financial position and cash flows for the respective winter heating seasons.  The swaps were based on ten-year normal weather. During the years ended December 31, 2010, 2011 and 2012, CERC recognized losses of $-0-, losses of less than $1 million and gains of $8 million, respectively, related to these swaps. The 2011/2012 winter weather hedge had a maximum payment limit of $11 million. Due to the warmer than normal weather, the maximum was reached by February 2012. Weather hedge gains and losses are included in revenues in the Statements of Consolidated Income.

(b) Derivative Fair Values and Income Statement Impacts

The following tables present information about CERC’s derivative instruments and hedging activities. The first two tables provide a balance sheet overview of CERC’s Derivative Assets and Liabilities as of December 31, 2011 and 2012, while the last table provides a breakdown of the related income statement impacts for the years ending December 31, 2011 and 2012.

Fair Value of Derivative Instruments
	December 31, 2011
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	88	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	20		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	15		110
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	—		13
Total		$	123	$	124

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 633 billion cubic feet (Bcf) or a net 84 Bcf long position.  Of the net long position, basis swaps constitute 74 Bcf and volumes associated with price stabilization activities of the Natural Gas Distribution business segment constitute 6 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $55 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $56 million.

Fair Value of Derivative Instruments
	December 31, 2012
Total derivatives not designated as hedging instruments	Balance Sheet Location	Derivative Assets Fair Value (2) (3)		Derivative Liabilities Fair Value (2) (3)
		(in millions)
Natural gas derivatives (1)	Current Assets: Non-trading derivative assets	$	37	$	1
Natural gas derivatives (1)	Other Assets: Non-trading derivative assets	6		—
Natural gas derivatives (1)	Current Liabilities: Non-trading derivative liabilities	5		27
Natural gas derivatives (1)	Other Liabilities: Non-trading derivative liabilities	1		4
Total		$	49	$	32

________________

(1) Natural gas contracts are subject to master netting arrangements and are presented on a net basis in the Consolidated Balance Sheets. This netting causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Consolidated Balance Sheets.

(2) The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 489 Bcf or a net 101 Bcf long position.  Of the net long position, basis swaps constitute 73 Bcf.

(3) The net of total non-trading derivative assets and liabilities is a $26 million asset as shown on CERC’s Consolidated Balance Sheets, and is comprised of the natural gas contracts derivative assets and liabilities separately shown above offset by collateral netting of $9 million.

For CERC’s price stabilization activities of the Natural Gas Distribution business segment, the settled costs of derivatives are ultimately recovered through purchased gas adjustments. Accordingly, the net unrealized gains and losses associated with these contracts are recorded as net regulatory assets. Realized and unrealized gains and losses on other derivatives are recognized in the Statements of Consolidated Income as revenue for retail sales derivative contracts and as natural gas expense for financial natural gas derivatives and non-retail related physical natural gas derivatives.

Income Statement Impact of Derivative Activity
		Year Ended December 31,
Total derivatives not designated as hedging instruments	Income Statement Location	2011			2012
		(in millions)
Natural gas derivatives	Gains (Losses) in Revenue	$	102		$	43
Natural gas derivatives (1)	Gains (Losses) in Expense: Natural Gas	(144		)	(63		)
Total		$	(42	)	$	(20	)

 ________________

(1) The Gains (Losses) in Expense: Natural Gas includes $(107) million and $(38) million of costs in 2011 and 2012, respectively, associated with price stabilization activities of the Natural Gas Distribution business segment that will be ultimately recovered through purchased gas adjustments.

(c) Credit Risk Contingent Features

CERC enters into financial derivative contracts containing material adverse change provisions.  These provisions could require CERC to post additional collateral if the Standard & Poor’s Ratings Services or Moody’s Investors Service, Inc. credit ratings of CERC are downgraded.  The total fair value of the derivative instruments that contain credit risk contingent features that are in a net liability position at December 31, 2011 and 2012 was $39 million and $5 million, respectively.  The aggregate fair value of assets that are already posted as collateral was less than $1 million at both December 31, 2011 and 2012.  If all derivative contracts (in a net liability position) containing credit risk contingent features were triggered at December 31, 2011 and 2012, $38 million and $5 million, respectively, of additional assets would be required to be posted as collateral.

(d) Credit Quality of Counterparties

In addition to the risk associated with price movements, credit risk is also inherent in CERC’s non-trading derivative activities. Credit risk relates to the risk of loss resulting from non-performance of contractual obligations by a counterparty. The following table shows the composition of counterparties to the non-trading derivative assets of CERC as of December 31, 2011 and 2012 (in millions):

	December 31, 2011				December 31, 2012
	Investment Grade(1)		Total		Investment Grade(1)		Total
Energy marketers	$	1	$	7	$	1	$	1
Financial institutions	—		—		—		—
Retail end users (2)	—		100		—		41
Total	$	1	$	107	$	1	$	42

 ________________

(1) “Investment grade” is primarily determined using publicly available credit ratings and considering credit support (such as parent company guaranties) and collateral, which encompass cash and standby letters of credit. For unrated counterparties, CERC determines a synthetic credit rating by performing financial statement analysis and considering contractual rights and restrictions and collateral.

(2) Retail end users represent customers who have contracted to fix the price of a portion of their physical gas requirements for future periods.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

(a) Pension Plans

Substantially all of CERC’s employees participate in CenterPoint Energy’s qualified non-contributory defined benefit pension plan. Under the cash balance formula, participants accumulate a retirement benefit based upon 5% of eligible earnings and accrued interest.

CenterPoint Energy’s funding policy is to review amounts annually in accordance with applicable regulations in order to achieve adequate funding of projected benefit obligations. Pension expense is allocated to CERC based on covered employees. This calculation is intended to allocate pension costs in the same manner as a separate employer plan. Assets of the plan are not segregated or restricted by CenterPoint Energy’s participating subsidiaries. CERC recognized pension expense of $34 million, $30 million and $32 million for the years ended December 31, 2010, 2011 and 2012, respectively.

In addition to the plan, CERC participates in CenterPoint Energy’s non-qualified benefit restoration plans, which allow participants to receive the benefits to which they would have been entitled under CenterPoint Energy’s non-contributory pension plan except for federally mandated limits on qualified plan benefits or on the level of compensation on which qualified plan benefits may be calculated. The expense associated with the non-qualified pension plan was $1 million, $2 million and $2 million for the years ended December 31, 2010, 2011 and 2012, respectively.

(b) Savings Plan

CERC participates in CenterPoint Energy’s qualified savings plan, which includes a cash or deferred arrangement under Section 401(k) of the Internal Revenue Code of 1986, as amended. Under the plan, participating employees may contribute a portion of their compensation, on a pre-tax or after-tax basis, generally up to a maximum of 50% of eligible compensation. CERC matches 100% of the first 6% of each employee’s compensation contributed. The matching contributions are fully vested at all times. CenterPoint Energy allocates to CERC the savings plan benefit expense related to CERC’s employees.  Savings plan benefit expense was $16 million, $17 million and $18 million for the years ended December 31, 2010, 2011, and 2012, respectively.

(c) Postretirement Benefits

CERC’s employees participate in CenterPoint Energy’s plans, which provide certain healthcare and life insurance benefits for retired employees on both a contributory and non-contributory basis. Employees become eligible for these benefits if they have met certain age and service requirements at retirement, as defined in the plans. Under plan amendments effective in early 1999, healthcare benefits for future retirees were changed to limit employer contributions for medical coverage. Such benefit costs are accrued over the active service period of employees. CERC is required to fund a portion of its obligations in accordance with rate orders. All other obligations are funded on a pay-as-you-go basis.

The net postretirement benefit cost includes the following components:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Service cost — benefits earned during the period	$	1		$	1		$	1
Interest cost on accumulated benefit obligation	7			6			5
Expected return on plan assets	(1		)	(1		)	(1		)
Amortization of prior service cost	2			2			2
Amortization of net loss	—			1			3
Net postretirement benefit cost	$	9		$	9		$	10

CERC used the following assumptions to determine net postretirement benefit costs:

	Year Ended December 31,
	2010		2011		2012
Discount rate	5.70	%	5.20	%	4.80	%
Expected return on plan assets	4.50	%	4.50	%	3.10	%

In determining net periodic benefits cost, CERC uses fair value, as of the beginning of the year, as its basis for determining expected return on plan assets.

Following are reconciliations of CERC’s beginning and ending balances of its postretirement benefit plan’s benefit obligation, plan assets and funded status for 2011 and 2012. The measurement dates for plan assets and obligations were December 31, 2011 and 2012.

	December 31,
	2011			2012
	(in millions , except for actuarial assumptions)
Change in Benefit Obligation
Accumulated benefit obligation, beginning of year	$	112		$	118
Service cost	1			1
Interest cost	6			5
Benefits paid	(14		)	(13		)
Participant contributions	4			4
Medicare reimbursement	2			2
Early retiree reinsurance program reimbursement	1			—
Actuarial loss	6			16
Accumulated benefit obligation, end of year	$	118		$	133
Change in Plan Assets
Plan assets, beginning of year	$	22		$	22
Benefits paid	(14		)	(13		)
Employer contributions	9			9
Participant contributions	4			4
Actual investment return	1			2
Plan assets, end of year	$	22		$	24
Amounts Recognized in Balance Sheets
Current liabilities-other	$	(7	)	$	(7	)
Other liabilities-benefit obligations	(89		)	(102		)
Net liability, end of year	$	(96	)	$	(109	)
Actuarial Assumptions
Discount rate	4.80		%	3.90		%
Expected long-term return on assets	3.10		%	3.10		%
Healthcare cost trend rate assumed for the next year	8.00		%	9.00		%
Prescription cost trend rate assumed for the next year	8.00		%	9.00		%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50		%	5.50		%
Year that the healthcare rate reaches the ultimate trend rate	2017			2017
Year that the prescription drug rate reaches the ultimate trend rate	2017			2017

The discount rate assumption was determined by matching the accrued cash flows of CenterPoint Energy’s plans against a hypothetical yield curve of high-quality corporate bonds represented by a series of annualized individual discount rates from one-half to 99 years.

The expected rate of return assumption was developed by a weighted-average return analysis of the targeted asset allocation of CenterPoint Energy’s plans and the expected real return for each asset class, based on the long-term capital market assumptions, adjusted for investment fees and diversification effects, in addition to expected inflation.

For measurement purposes, healthcare and prescription costs are assumed to increase to 9.00% during 2013, after which this rate decreases until reaching the ultimate trend rate of 5.50% in 2017.

Amounts recognized in accumulated other comprehensive loss consist of the following:

	December 31,
	2011			2012
	(in millions)
Unrecognized actuarial loss	$	28		$	20
Unrecognized prior service cost	4			2
Total recognized in accumulated other comprehensive loss	32			22
Less deferred tax benefit (1)	(25		)	(21		)
Net amount recognized in accumulated other comprehensive loss	$	7		$	1

________________

(1) CERC’s postretirement benefit obligation is reduced by the impact of previously non-taxable government subsidies under the Medicare Prescription Drug Act.  Because the subsidies were non-taxable, the temporary difference used in measuring the deferred tax impact was determined on the unrecognized losses excluding such subsidies.

The changes in plan assets and benefit obligations recognized in other comprehensive income during 2012 are as follows:

	Postretirement Benefits
	(in millions)
Net loss	$	(8	)
Amortization of prior service cost	(2		)
Total recognized in other comprehensive income	$	(10	)

The total expense recognized in net periodic costs and other comprehensive income was $-0- for postretirement benefits for the year ended December 31, 2012.

The amounts in accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost during 2013 are as follows:

	Postretirement Benefits
	(in millions)
Unrecognized actuarial loss	$	1
Unrecognized prior service cost	1
Amounts in accumulated other comprehensive loss to be recognized as net periodic cost	$	2

Assumed healthcare cost trend rates have a significant effect on the reported amounts for CERC’s postretirement benefit plans. A 1% change in the assumed healthcare cost trend rate would have the following effects:

	1% Increase		1% Decrease
	(in millions)
Effect on the postretirement benefit obligation	$	4	$	(3	)
Effect on the total of service and interest cost	—		—

In managing the investments associated with the postretirement benefit plan, CERC’s objective is to preserve and enhance the value of plan assets while maintaining an acceptable level of volatility. These objectives are expected to be achieved through an investment strategy that manages liquidity requirements while maintaining a long-term horizon in making investment decisions and efficient and effective management of plan assets.

As part of the investment strategy discussed above, CERC adopted and maintained the following asset allocation ranges for its postretirement benefit plan:

U.S. equity	15-25%
International equity	2-12%
Fixed income	68-78%
Cash	0-2%

The fair values of CERC’s postretirement plan assets at December 31, 2011 and 2012, by asset category are as follows:

	Fair Value Measurements at December 31, 2011 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	22	$	22	$	—	$	—
Total	$	22	$	22	$	—	$	—

________________

(1) 72% of the amount invested in mutual funds was in fixed income securities; 22% was in U.S. equities and 6% was in international equities.

	Fair Value Measurements at December 31, 2012 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	24	$	24	$	—	$	—
Total	$	24	$	24	$	—	$	—

 ________________

(1) 70% of the amount invested in mutual funds was in fixed income securities; 23% was in U.S. equities and 7% was in international equities.

CERC expects to contribute $8 million to its postretirement benefits plan in 2013. The following benefit payments are expected to be made by the postretirement benefit plan:

	Postretirement Benefit Plan
	Benefit Payments		Medicare Subsidy Receipts
	(in millions)
2013	$	11	$	(2	)
2014	11		(2		)
2015	11		(2		)
2016	12		(2		)
2017	12		(2		)
2018-2022	64		(16		)

(d) Postemployment Benefits

CERC participates in CenterPoint Energy’s plan that provides postemployment benefits for former or inactive employees, their beneficiaries and covered dependents, after employment but before retirement (primarily healthcare and life insurance benefits for participants in the long-term disability plan). CERC recorded postemployment benefit income of $1 million, expense of $4 million and expense of $5 million for the years ended December 31, 2010, 2011 and 2012, respectively. Amounts relating to postemployment benefits included in “Benefit Obligations” in the accompanying Consolidated Balance Sheets at December 31, 2011 and 2012, were $12 million and $14 million, respectively.

(e) Other Non-Qualified Plans

CERC participates in CenterPoint Energy’s deferred compensation plans that provide benefits payable to directors, officers and certain key employees or their designated beneficiaries at specified future dates, upon termination, retirement or death. Benefit payments are made from the general assets of CERC. During 2010, 2011 and 2012, the benefit expense relating to these plans was less than $1 million each year. Amounts relating to deferred compensation plans included in “Benefit Obligations” in the accompanying Consolidated Balance Sheets at December 31, 2011 and 2012 were $3 million and $2 million, respectively.

(f) Other Employee Matters

As of December 31, 2012, approximately 28% of CERC's employees were covered by collective bargaining agreements.

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Related Party Transactions

12 Months Ended

Dec. 31, 2012

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

CERC participates in a “money pool” through which it can borrow or invest on a short-term basis. Funding needs are aggregated and external borrowing or investing is based on the net cash position. The net funding requirements of the money pool are expected to be met with borrowings under CenterPoint Energy’s revolving credit facility or the sale of CenterPoint Energy’s commercial paper. CERC had money pool borrowings of $383 million and $779 million at December 31, 2011 and 2012, respectively, which are included in accounts and notes payable —affiliated companies in the Consolidated Balance Sheets.  At December 31, 2012, CERC’s money pool borrowings had a weighted-average interest rate of 0.1%.

CERC had net interest expense related to affiliate borrowings of $2 million, less than $1 million and $4 million for the years ended December 31, 2010, 2011 and 2012, respectively.

CenterPoint Energy provides some corporate services to CERC. The costs of services have been charged directly to CERC using methods that management believes are reasonable. These methods include negotiated usage rates, dedicated asset assignment and proportionate corporate formulas based on operating expenses, assets, gross margin, employees and a composite of assets, gross margin and employees. These charges are not necessarily indicative of what would have been incurred had CERC not been an affiliate of CenterPoint Energy. Amounts charged to CERC for these services were $154 million, $164 million and $163 million for 2010, 2011 and 2012, respectively, and are included primarily in operation and maintenance expenses.

No dividends were paid to the parent in 2010, 2011 and 2012.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Assets and liabilities are recorded at fair value in the Consolidated Balance Sheets and are categorized based upon the level of judgment associated with the inputs used to measure their value. Hierarchical levels, as defined below and directly related to the amount of subjectivity associated with the inputs to fair valuations of these assets and liabilities, are as follows:

Level 1: Inputs are unadjusted quoted prices in active markets for identical assets or liabilities at the measurement date. The types of assets carried at Level 1 fair value generally are exchange-traded derivatives and equity securities.

Level 2: Inputs, other than quoted prices included in Level 1, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar instruments in active markets, and inputs other than quoted prices that are observable for the asset or liability. Fair value assets and liabilities that are generally included in this category are derivatives with fair values based on inputs from actively quoted markets.  A market approach is utilized to value CERC’s Level 2 assets or liabilities.

Level 3: Inputs are unobservable for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. Unobservable inputs reflect CERC’s judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. CERC develops these inputs based on the best information available, including CERC’s own data. A market approach is utilized to value CERC’s Level 3 assets or liabilities. Currently, CERC’s Level 3 assets and liabilities are comprised of physical forward contracts and options. Level 3 physical forward contracts are valued using a discounted cash flow model which includes illiquid forward price curve locations (ranging from $3.07-$4.79 per one million British thermal units (Btu)) as an unobservable input. Level 3 options are valued through Black-Scholes (including forward start) option models which include option volatilities (ranging from 0-58%) as an unobservable input.  CERC’s Level 3 derivative assets and liabilities consist of both long and short positions (forwards and options) and their fair value is sensitive to forward prices and volatilities.  If forward prices decrease, CERC’s long forwards lose value whereas its short forwards gain in value.  If volatility decreases, CERC’s long options lose value whereas its short options gain in value. Instruments classified as Level 3 include the revaluation of the Competitive Natural Gas Sales and Services reporting unit (See Note 4).

CERC determines the appropriate level for each financial asset and liability on a quarterly basis and recognizes transfers between levels at the end of the reporting period.  For the year ended December 31, 2012, there were no transfers between Level 1 and 2 with regard to Natural Gas derivatives. CERC also recognizes purchases of Level 3 financial assets and liabilities at their fair market value at the end of the reporting period.

The following tables present information about CERC’s assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of December 31, 2011 and 2012, and indicate the fair value hierarchy of the valuation techniques utilized by CERC to determine such fair value.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2011
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		112		10		(16		)	107
Total assets	$	13	$	112	$	10	$	(16	)	$	119
Liabilities
Natural gas derivatives	$	19	$	101	$	4	$	(72	)	$	52
Total liabilities	$	19	$	101	$	4	$	(72	)	$	52

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $56 million posted with the same counterparties.

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Netting Adjustments (1)			Balance as of December 31, 2012
	(in millions)
Assets
Corporate equities	$	1	$	—	$	—	$	—		$	1
Investments, including money market funds	11		—		—		—			11
Natural gas derivatives	1		40		7		(6		)	42
Total assets	$	13	$	40	$	7	$	(6	)	$	54
Liabilities
Natural gas derivatives	$	5	$	21	$	5	$	(15	)	$	16
Total liabilities	$	5	$	21	$	5	$	(15	)	$	16

________________

(1) Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $9 million posted with the same counterparties.

The following tables present additional information about assets or liabilities, including derivatives that are measured at fair value on a recurring basis for which CERC has utilized Level 3 inputs to determine fair value:

	Fair Value Measurements Using Significant  Unobservable Inputs (Level 3)
	Derivative assets and liabilities, net
	Year Ended December 31,
	2010			2011			2012
	(in millions)
Beginning balance	$	(6	)	$	3		$	6
Total gains or (losses):
Included in earnings	4			6			3
Included in regulatory assets	(1		)	—			—
Total settlements:
Included in earnings	(2		)	(3		)	(6		)
Included in regulatory assets	8			—			—
Total purchases	—			2			—
Transfers out of Level 3(1)	—			(2		)	(1		)
Ending balance	$	3		$	6		$	2
The amount of total gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$	4		$	5		$	1

________

(1) During 2010, 2011 and 2012, CERC did not have material Level 3 sales or significant transfers into Level 3.

Estimated Fair Value of Financial Instruments

The fair values of cash and cash equivalents and short-term borrowings are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below. Non-trading derivative assets and liabilities are stated at fair value and are excluded from the table below. The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by the market price.

	December 31, 2011				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions)
Financial liabilities:
Long-term debt	$	2,919	$	3,272	$	2,641	$	3,094

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Reportable Business Segments (Tables)

12 Months Ended

Dec. 31, 2012

Reportable Business Segments [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Financial data for business segments and products and services are as follows (in millions):

	Revenues from External Customers		Inter-segment Revenues			Depreciation and Amortization		Operating Income (Loss)			Total Assets			Expenditures for Long- Lived Assets
As of and for the year ended December 31, 2010:
Natural Gas Distribution	$	3,199	$	14		$	166	$	231		$	4,575		$	202
Competitive Natural Gas Sales and Services	2,617		34			4		16			1,190			2
Interstate Pipelines (1)	464		137			52		270			3,672			102
Field Services (2)	289		49			25		151			1,803			668
Other	—		—			1		(1		)	659			—
Reconciling Eliminations	—		(234		)	—		—			(1,361		)	—
Consolidated	$	6,569	$	—		$	248	$	667		$	10,538		$	974
As of and for the year ended December 31, 2011:
Natural Gas Distribution	$	2,823	$	18		$	166	$	226		$	4,636		$	295
Competitive Natural Gas Sales and Services	2,488		23			5		6			1,089			5
Interstate Pipelines (1)	421		132			54		248			3,867			98
Field Services (2)	370		42			37		189			1,894			201
Other	—		—			—		(7		)	660			—
Reconciling Eliminations	—		(215		)	—		—			(1,459		)	—
Consolidated	$	6,102	$	—		$	262	$	662		$	10,687		$	599
As of and for the year ended December 31, 2012:
Natural Gas Distribution	$	2,320	$	22		$	173	$	226		$	4,775		$	359
Competitive Natural Gas Sales and Services	1,758		26			6		(250		)	839			6
Interstate Pipelines (1)	356		146			56		207			4,004			132
Field Services (2)	467		39			50		214			2,453			52
Other	—		—			—		(3		)	647			—
Reconciling Eliminations	—		(233		)	—		—			(1,528		)	—
Consolidated	$	4,901	$	—		$	285	$	394		$	11,190		$	549

________________

(1) Interstate Pipelines recorded equity income of $19 million, $21 million and $26 million in the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in SESH, a jointly-owned pipeline. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Interstate Pipelines’ investment in SESH was $413 million, $409 million and $404 million as of December 31, 2010, 2011 and 2012, respectively, and is included in Investment in unconsolidated affiliates.

(2) Field Services recorded equity income of $10 million, $9 million and $5 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in a jointly-owned gas processing plant. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Field Services’ investment in the jointly-owned gas processing plant was $55 million and $63 million as of December 31, 2010 and 2011, respectively, and is included in Investment in unconsolidated affiliates. Beginning on August 1, 2012, financial results for Waskom are included in operating income due to the July 31, 2012 purchase of the 50% interest in Waskom that CERC did not already own.

Revenue from External Customers by Products and Services [Table Text Block]

	Year Ended December 31,
Revenues by Products and Services:	2010		2011		2012
	(in millions)
Retail gas sales	$	4,412	$	4,019	$	3,328
Wholesale gas sales	1,250		1,149		613
Gas transportation and processing	785		824		847
Energy products and services	122		110		113
Total	$	6,569	$	6,102	$	4,901

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Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Trade Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 24		$ 25		$ 23
Additions Charged To Income	15		25		30
Additions Charged to Other Accounts	0		0		0
Deductions From Reserves	16	[1]	26	[1]	28	[1]
Balance at End of Period	23		24		25
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	3		3		5
Additions Charged To Income	(1)		0		(2)
Additions Charged to Other Accounts	0	[1]	0		0
Deductions From Reserves			0	[1]	0	[1]
Balance at End of Period	$ 2		$ 3		$ 3

[1] Deductions from reserves represent losses or expenses for which the respective reserves were created. In the case of the uncollectible accounts reserve, such deductions are net of recoveries of amounts previously written off.

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Reportable Business Segments

12 Months Ended

Dec. 31, 2012

Reportable Business Segments [Abstract]

Reportable Business Segments

Reportable Business Segments

Because CERC is an indirect wholly owned subsidiary of CenterPoint Energy, CERC’s determination of reportable business segments considers the strategic operating units under which CenterPoint Energy manages sales, allocates resources and assesses performance of various products and services to wholesale or retail customers in differing regulatory environments. The accounting policies of the business segments are the same as those described in the summary of significant accounting policies except that some executive benefit costs have not been allocated to business segments.  CERC uses operating income as the measure of profit or loss for its business segments.

CERC’s reportable business segments include the following: Natural Gas Distribution, Competitive Natural Gas Sales and Services, Interstate Pipelines, Field Services and Other Operations.  Natural Gas Distribution consists of intrastate natural gas sales to, and natural gas transportation and distribution for, residential, commercial, industrial and institutional customers. Competitive Natural Gas Sales and Services represents CenterPoint Energy’s non-rate regulated gas sales and services operations. The Interstate Pipelines business segment includes the interstate natural gas pipeline operations. The Field Services business segment includes the non-rate regulated natural gas gathering, processing and treating operations. The Other Operations business segment includes unallocated corporate costs and inter-segment eliminations.

Long-lived assets include net property, plant and equipment, net goodwill and other intangibles and equity investments in unconsolidated subsidiaries. Intersegment sales are eliminated in consolidation.

Financial data for business segments and products and services are as follows (in millions):

	Revenues from External Customers		Inter-segment Revenues			Depreciation and Amortization		Operating Income (Loss)			Total Assets			Expenditures for Long- Lived Assets
As of and for the year ended December 31, 2010:
Natural Gas Distribution	$	3,199	$	14		$	166	$	231		$	4,575		$	202
Competitive Natural Gas Sales and Services	2,617		34			4		16			1,190			2
Interstate Pipelines (1)	464		137			52		270			3,672			102
Field Services (2)	289		49			25		151			1,803			668
Other	—		—			1		(1		)	659			—
Reconciling Eliminations	—		(234		)	—		—			(1,361		)	—
Consolidated	$	6,569	$	—		$	248	$	667		$	10,538		$	974
As of and for the year ended December 31, 2011:
Natural Gas Distribution	$	2,823	$	18		$	166	$	226		$	4,636		$	295
Competitive Natural Gas Sales and Services	2,488		23			5		6			1,089			5
Interstate Pipelines (1)	421		132			54		248			3,867			98
Field Services (2)	370		42			37		189			1,894			201
Other	—		—			—		(7		)	660			—
Reconciling Eliminations	—		(215		)	—		—			(1,459		)	—
Consolidated	$	6,102	$	—		$	262	$	662		$	10,687		$	599
As of and for the year ended December 31, 2012:
Natural Gas Distribution	$	2,320	$	22		$	173	$	226		$	4,775		$	359
Competitive Natural Gas Sales and Services	1,758		26			6		(250		)	839			6
Interstate Pipelines (1)	356		146			56		207			4,004			132
Field Services (2)	467		39			50		214			2,453			52
Other	—		—			—		(3		)	647			—
Reconciling Eliminations	—		(233		)	—		—			(1,528		)	—
Consolidated	$	4,901	$	—		$	285	$	394		$	11,190		$	549

________________

(1) Interstate Pipelines recorded equity income of $19 million, $21 million and $26 million in the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in SESH, a jointly-owned pipeline. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Interstate Pipelines’ investment in SESH was $413 million, $409 million and $404 million as of December 31, 2010, 2011 and 2012, respectively, and is included in Investment in unconsolidated affiliates.

(2) Field Services recorded equity income of $10 million, $9 million and $5 million for the years ended December 31, 2010, 2011 and 2012, respectively, from its 50% interest in a jointly-owned gas processing plant. These amounts are included in Equity in earnings of unconsolidated affiliates under the Other Income (Expense) caption.  Field Services’ investment in the jointly-owned gas processing plant was $55 million and $63 million as of December 31, 2010 and 2011, respectively, and is included in Investment in unconsolidated affiliates. Beginning on August 1, 2012, financial results for Waskom are included in operating income due to the July 31, 2012 purchase of the 50% interest in Waskom that CERC did not already own.

	Year Ended December 31,
Revenues by Products and Services:	2010		2011		2012
	(in millions)
Retail gas sales	$	4,412	$	4,019	$	3,328
Wholesale gas sales	1,250		1,149		613
Gas transportation and processing	785		824		847
Energy products and services	122		110		113
Total	$	6,569	$	6,102	$	4,901

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Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2012

Regulatory Matters [Abstract]

Schedule of Regulatory Assets and Liabilities

The following is a list of regulatory assets/liabilities reflected on CERC's Consolidated Balance Sheets as of December 31, 2011 and 2012:

	December 31,
	2011			2012
	(in millions)
Regulatory assets in other long-term assets (1)	$	97		$	105
Regulatory liabilities	(597		)	(619		)
Net	$	(500	)	$	(514	)

________________

(1) Regulatory assets that are not earning a return were not material at December 31, 2011 and 2012.

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Unaudited Quarterly Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 1,551	$ 954	$ 846	$ 1,550	$ 1,608	$ 1,171	$ 1,228	$ 2,095	$ 4,901	$ 6,102	$ 6,569
Operating Income (Loss)	211	(152)	106	229	177	111	114	260	394	662	667
Net Income (Loss)	$ 104	$ (127)	$ 42	$ 118	$ 93	$ 43	$ 47	$ 133	$ 137	$ 316	$ 300

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Employee Benefit Plans Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	$ 24		$ 22
Percentage of investment in mutual funds allocated to fixed income securities	70.00%		72.00%
Percentage of investment in mutual funds allocated to U.S. equities	23.00%		22.00%
Percentage of investment in mutual funds allocated to international equities	7.00%		6.00%
Estimated contributions next fiscal year	8
Postemployment Benefits
Postemployment benefit income (expense)	(5)		(4)		1
Postemployment benefits included in Benefit Obligations	14		12
Benefit expense related to deferred compensation plans	1		1		1
Other non-qualified plans benefit obligations deferred compensation	2		3
Equity Funds [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	24	[1]	22	[2]
Fair Value, Inputs, Level 1 [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	24		22
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	24	[1]	22	[2]
Fair Value, Inputs, Level 2 [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	0		0
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	0	[1]	0	[2]
Fair Value, Inputs, Level 3 [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	0		0
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	0	[1]	0	[2]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Fair Value of Plan Assets	24		22		22
Expected Future Benefit Payments, Fiscal Year Maturity
Benefit Payments - 2013	11
Benefit Payments - 2014	11
Benefit Payments - 2015	11
Benefit Payments - 2016	12
Benefit Payments - 2017	12
Benefit Payments - 2018-2022	64
Medicare Subsidy Receipts - 2013	(2)
Medicare Subsidy Receipts - 2014	(2)
Medicare Subsidy Receipts - 2015	(2)
Medicare Subsidy Receipts - 2016	(2)
Medicare Subsidy Receipts - 2017	(2)
Medicare Subsidy Receipts - 2018-2022	$ (16)
Other Postretirement Benefit Plans, Defined Benefit [Member] | U.S. Equity [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	15.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	25.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | International Equity [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	2.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	12.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	68.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	78.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	2.00%

[1] 70% of the amount invested in mutual funds was in fixed income securities; 23% was in U.S. equities and 7% was in international equities.

[2] 72% of the amount invested in mutual funds was in fixed income securities; 22% was in U.S. equities and 6% was in international equities.

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 1		$ 1
Accounts receivable, net	544		542
Accrued unbilled revenue	258		253
Accounts and notes receivable - affiliated companies	15		17
Inventory	228		273
Non-trading derivative assets	36		87
Taxes receivable	0		1
Deferred income tax assets	0		8
Prepaid expenses and other current assets	133		122
Total current assets	1,215		1,304
Property, plant and equipment, net	7,901		7,030
Other Assets:
Goodwill	1,468		1,696
Non-trading derivative assets	6		20
Investment in unconsolidated affiliates	405		472
Other	195		165
Total other assets	2,074		2,353
Total Assets	11,190		10,687
Current Liabilities:
Short-term borrowings	38	[1]	62	[1]
Current portion of long-term debt	365	[1]	0	[1]
Accounts payable	443		427
Accounts and notes payable - affiliated companies	818		419
Taxes accrued	72		82
Interest accrued	48		48
Customer deposits	79		74
Non-trading derivative liabilities	14		46
Other	177		157
Total current liabilities	2,054		1,315
Other Liabilities:
Accumulated deferred income taxes, net	1,676		1,420
Non-trading derivative liabilities	2		6
Benefit obligations	122		108
Regulatory liabilities	619		597
Other	208		232
Total other liabilities	2,627		2,363
Long-term Debt	2,276		2,919
Stockholder's equity	4,233		4,090
Total Liabilities and Stockholder's Equity	$ 11,190		$ 10,687

[1] Includes amounts due or exchangeable within one year of the date noted.

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant and Equipment

(a) Property, Plant and Equipment

Property, plant and equipment includes the following:

	Weighted Average Useful Lives	December 31,
	(Years)	2011		2012
		(in millions)
Natural Gas Distribution	32	$	3,959	$	4,321
Competitive Natural Gas Sales and Services	26	76		80
Interstate Pipelines	56	2,675		2,803
Field Services	42	1,754		2,359
Other property	12	55		52
Total		8,519		9,615
Accumulated depreciation and amortization:
Natural Gas Distribution		1,069		1,194
Competitive Natural Gas Sales and Services		20		25
Interstate Pipelines		302		355
Field Services		72		118
Other property		26		22
Total accumulated depreciation and amortization		1,489		1,714
Property, plant and equipment, net		$	7,030	$	7,901

(b) Depreciation and Amortization

The following table presents depreciation and amortization expense for 2010, 2011 and 2012:

	Year Ended December 31,
	2010		2011		2012
	(in millions)
Depreciation expense	$	232	$	244	$	267
Amortization expense	16		18		18
Total depreciation and amortization expense	$	248	$	262	$	285

(c) Asset Retirement Obligations

A reconciliation of the changes in the asset retirement obligation (ARO) liability is as follows (in millions):

	December 31,
	2011		2012
Beginning balance	$	58	$	132
Accretion expense	3		6
Revisions in estimates of cash flows	71		(3		)
Ending balance	$	132	$	135

The increase of $71 million in the ARO from the revision of estimate in 2011 is primarily attributable to an increase in the disposal costs used in the cash flow assumptions. The decrease of $3 million in the ARO from the revision of estimate in 2012 is primarily attributable to a steel pipe replacement effort during 2012 which shifted the cost of removal obligation further into the future and lowered the current liability. There were no material additions or settlements during the years ended December 31, 2011 or 2012.

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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The amounts in accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost during 2013 are as follows:

	Postretirement Benefits
	(in millions)
Unrecognized actuarial loss	$	1
Unrecognized prior service cost	1
Amounts in accumulated other comprehensive loss to be recognized as net periodic cost	$	2

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following benefit payments are expected to be made by the postretirement benefit plan:

	Postretirement Benefit Plan
	Benefit Payments		Medicare Subsidy Receipts
	(in millions)
2013	$	11	$	(2	)
2014	11		(2		)
2015	11		(2		)
2016	12		(2		)
2017	12		(2		)
2018-2022	64		(16		)

Following are reconciliations of CERC’s beginning and ending balances of its postretirement benefit plan’s benefit obligation, plan assets and funded status for 2011 and 2012. The measurement dates for plan assets and obligations were December 31, 2011 and 2012.

	December 31,
	2011			2012
	(in millions , except for actuarial assumptions)
Change in Benefit Obligation
Accumulated benefit obligation, beginning of year	$	112		$	118
Service cost	1			1
Interest cost	6			5
Benefits paid	(14		)	(13		)
Participant contributions	4			4
Medicare reimbursement	2			2
Early retiree reinsurance program reimbursement	1			—
Actuarial loss	6			16
Accumulated benefit obligation, end of year	$	118		$	133
Change in Plan Assets
Plan assets, beginning of year	$	22		$	22
Benefits paid	(14		)	(13		)
Employer contributions	9			9
Participant contributions	4			4
Actual investment return	1			2
Plan assets, end of year	$	22		$	24
Amounts Recognized in Balance Sheets
Current liabilities-other	$	(7	)	$	(7	)
Other liabilities-benefit obligations	(89		)	(102		)
Net liability, end of year	$	(96	)	$	(109	)
Actuarial Assumptions
Discount rate	4.80		%	3.90		%
Expected long-term return on assets	3.10		%	3.10		%
Healthcare cost trend rate assumed for the next year	8.00		%	9.00		%
Prescription cost trend rate assumed for the next year	8.00		%	9.00		%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50		%	5.50		%
Year that the healthcare rate reaches the ultimate trend rate	2017			2017
Year that the prescription drug rate reaches the ultimate trend rate	2017			2017

As part of the investment strategy discussed above, CERC adopted and maintained the following asset allocation ranges for its postretirement benefit plan:

U.S. equity	15-25%
International equity	2-12%
Fixed income	68-78%
Cash	0-2%

The net postretirement benefit cost includes the following components:

	Year Ended December 31,
	2010			2011			2012
	(in millions)
Service cost — benefits earned during the period	$	1		$	1		$	1
Interest cost on accumulated benefit obligation	7			6			5
Expected return on plan assets	(1		)	(1		)	(1		)
Amortization of prior service cost	2			2			2
Amortization of net loss	—			1			3
Net postretirement benefit cost	$	9		$	9		$	10

CERC used the following assumptions to determine net postretirement benefit costs:

	Year Ended December 31,
	2010		2011		2012
Discount rate	5.70	%	5.20	%	4.80	%
Expected return on plan assets	4.50	%	4.50	%	3.10	%

Amounts recognized in accumulated other comprehensive loss consist of the following:

	December 31,
	2011			2012
	(in millions)
Unrecognized actuarial loss	$	28		$	20
Unrecognized prior service cost	4			2
Total recognized in accumulated other comprehensive loss	32			22
Less deferred tax benefit (1)	(25		)	(21		)
Net amount recognized in accumulated other comprehensive loss	$	7		$	1

________________

(1) CERC’s postretirement benefit obligation is reduced by the impact of previously non-taxable government subsidies under the Medicare Prescription Drug Act.  Because the subsidies were non-taxable, the temporary difference used in measuring the deferred tax impact was determined on the unrecognized losses excluding such subsidies.

The changes in plan assets and benefit obligations recognized in other comprehensive income during 2012 are as follows:

	Postretirement Benefits
	(in millions)
Net loss	$	(8	)
Amortization of prior service cost	(2		)
Total recognized in other comprehensive income	$	(10	)

Defined Benefit Plan Schedule Of Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates Text Block

Assumed healthcare cost trend rates have a significant effect on the reported amounts for CERC’s postretirement benefit plans. A 1% change in the assumed healthcare cost trend rate would have the following effects:

	1% Increase		1% Decrease
	(in millions)
Effect on the postretirement benefit obligation	$	4	$	(3	)
Effect on the total of service and interest cost	—		—

Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Text Block]

The fair values of CERC’s postretirement plan assets at December 31, 2011 and 2012, by asset category are as follows:

	Fair Value Measurements at December 31, 2011 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	22	$	22	$	—	$	—
Total	$	22	$	22	$	—	$	—

________________

(1) 72% of the amount invested in mutual funds was in fixed income securities; 22% was in U.S. equities and 6% was in international equities.

	Fair Value Measurements at December 31, 2012 (in millions)
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Mutual funds (1)	$	24	$	24	$	—	$	—
Total	$	24	$	24	$	—	$	—

 ________________

(1) 70% of the amount invested in mutual funds was in fixed income securities; 23% was in U.S. equities and 7% was in international equities.

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Goodwill (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Goodwill			$ 1,468	$ 1,696
Impairment Charge		252	252	0	0
Acquisition	24		24
Natural Gas Distribution [Member]
Goodwill [Line Items]
Goodwill			746	746
Impairment Charge			0
Acquisition			0
Interstate Pipelines [Member]
Goodwill [Line Items]
Goodwill			579	579
Impairment Charge			0
Acquisition			0
Competitive Natural Gas Sales and Services [Member]
Goodwill [Line Items]
Goodwill			83	335
Impairment Charge			252
Acquisition			0
Field Services [Member]
Goodwill [Line Items]
Goodwill			49	25
Impairment Charge			0
Acquisition			24
Other Operations [Member]
Goodwill [Line Items]
Goodwill			11	11
Impairment Charge			0
Acquisition			$ 0

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Unaudited Quarterly Information

12 Months Ended

Dec. 31, 2012

Unaudited Quarterly Information [Abstract]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Information

Summarized quarterly financial data is as follows:

	Year Ended December 31, 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in millions)
Revenues	$	2,095	$	1,228	$	1,171	$	1,608
Operating income	260		114		111		177
Net income	133		47		43		93

	Year Ended December 31, 2012
	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	(in millions)
Revenues	$	1,550	$	846	$	954		$	1,551
Operating income (loss)	229		106		(152		)	211
Net income (loss)	118		42		(127		)	104