10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the Quarterly Period Ended March 31, 2015

or

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

Commission file number 001-35917

Tallgrass Energy Partners, LP

(Exact name of registrant as specified in its charter)

Delaware	46-1972941
(State or other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification Number)
4200 W. 115th Street, Suite 350
Leawood, Kansas	66211
(Address of Principal Executive Offices)	(Zip Code)

(913) 928-6060

(Registrant's Telephone Number, Including Area Code)

 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  ý    No  ¨

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  ý    No  ¨

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 the definitions of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

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

On May 11, 2015, the Registrant had 60,234,105 Common Units and 834,391 General Partner Units outstanding.

TALLGRASS ENERGY PARTNERS, LP

TABLE OF CONTENTS

PART 1—FINANCIAL INFORMATION	1
Item 1. Financial Statements	1
CONDENSED CONSOLIDATED BALANCE SHEETS	1
CONDENSED CONSOLIDATED STATEMENTS OF INCOME	2
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS	3
CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL	4
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	5
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
Item 3. Quantitative and Qualitative Disclosures About Market Risk	32
Item 4. Controls and Procedures	34
PART II - OTHER INFORMATION	34
Item 1. Legal Proceedings	34
Item 1A. Risk Factors	34
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3. Defaults Upon Senior Securities	34
Item 4. Mine Safety Disclosures	34
Item 5. Other Information	34
Item 6. Exhibits	35
SIGNATURES	36

Glossary of Common Industry and Measurement Terms

Bakken oil production area: Montana and North Dakota in the United States and Saskatchewan and Manitoba in Canada.

Barrel (or bbl): Forty two U.S. gallons.

Base Gas (or Cushion Gas): The volume of gas that is intended as permanent inventory in a storage reservoir to maintain adequate pressure and deliverability rates.

BBtu: One billion British Thermal Units.

Bcf: One billion cubic feet.

British Thermal Units or Btus: the amount of heat energy needed to raise the temperature of one pound of water by one degree Fahrenheit.

Condensate: A NGL with a low vapor pressure, mainly composed of propane, butane, pentane and heavier hydrocarbon fractions.

Contract barrels: Barrels of crude oil that our customers have contractually agreed to ship in exchange for assurance of capacity and deliverability to delivery points.

Delivery point: the point at which product in a pipeline is delivered to the end user.

Dry gas: A gas primarily composed of methane and ethane where heavy hydrocarbons and water either do not exist or have been removed through processing.

Dth: A dekatherm, which is a unit of energy equal to 10 therms or one million British thermal units.

End-user markets: The ultimate users and consumers of transported energy products.

Fee Based Processing Contracts: Natural gas processing contracts that are primarily based upon a fixed fee and/or a volumetric-based fee rate, which is typically tied to reserved capacity or inlet volumes.

FERC: Federal Energy Regulatory Commission.

Firm transportation and storage services: Those services pursuant to which customers receive firm assurances regarding the availability of capacity and deliverability of natural gas on our assets up to a contracted amount at specified receipt and delivery points. Firm transportation contracts obligate our customers to pay a fixed monthly reservation charge to reserve an agreed upon amount of pipeline capacity for transportation regardless of the actual pipeline capacity used by the customer during each month. Firm storage contracts obligate our customers to pay a fixed monthly charge for the firm right to inject, withdraw and store a specified volume of natural gas regardless of the amount of storage capacity actually utilized by the customer.

Fractionation: The process by which NGLs are further separated into individual, more valuable components including ethane, propane, butane, isobutane and natural gasoline.

GAAP: Generally accepted accounting principles in the United States of America.

GHGs: Greenhouse gases.

Header system: Networks of medium-to-large-diameter high pressure pipelines that connect local gathering systems to large diameter high pressure long-haul transportation pipelines.

HP: Horsepower.

Interruptible transportation and storage services: Those services pursuant to which customers receive only limited assurances regarding the availability of capacity and deliverability in transportation or storage facilities, as applicable, and pay fees based on their actual utilization of such assets. Under interruptible service contracts, our customers pay fees based on their actual utilization of assets for transportation and storage services. These customers are not assured capacity or service.

Keep Whole Processing Contracts: Natural gas processing contracts in which we are required to replace the Btu content of the NGLs extracted from inlet wet gas processed with purchased dry natural gas.

Line fill: The volume of oil, in barrels, in the pipeline from the origin to the destination.

Liquefied natural gas or LNG: Natural gas that has been cooled to minus 161 degrees Celsius for transportation, typically by ship. The cooling process reduces the volume of natural gas by 600 times.

Local distribution company or LDC: LDCs are involved in the delivery of natural gas to consumers within a specific geographic area.

MMBtu: One million British Thermal Units.

Mcf: One thousand cubic feet.

MMcf: One million cubic feet.

Natural gas liquids or NGLs: Those hydrocarbons in natural gas that are separated from the natural gas as liquids through the process of absorption, condensation, adsorption or other methods in natural gas processing or cycling plants. Generally such liquids consist of propane and heavier hydrocarbons and are commonly referred to as lease condensate, natural gasoline and liquefied petroleum gases. Natural gas liquids include natural gas plant liquids (primarily ethane, propane, butane and isobutane) and lease condensate (primarily pentanes produced from natural gas at lease separators and field facilities).

Natural Gas Processing: The separation of natural gas into pipeline-quality natural gas and a mixed NGL stream.

Non-contract barrels: Barrels of crude oil that our customers ship based solely on availability of capacity and deliverability with no assurance of future capacity.

No-notice service: Those services pursuant to which customers receive the right to transport or store natural gas on assets outside of the daily nomination cycle without incurring penalties.

NYMEX: New York Mercantile Exchange.

Park and loan services: Those services pursuant to which customers receive the right to store natural gas in (park), or borrow gas from (loan), our facilities on a seasonal basis.

Percent of Proceeds Processing Contracts: Natural gas processing contracts in which we process our customer’s natural gas, sell the resulting NGLs and residue gas and divide the proceeds of those sales between us and the customer. Some percent of proceeds contracts may also require our customers to pay a monthly reservation fee for processing capacity.

PHMSA: The United States Department of Transportation’s Pipeline and Hazardous Materials Safety Administration.

Play: A proven geological formation that contains commercial amounts of hydrocarbons.

Receipt point: The point where production is received by or into a gathering system or transportation pipeline.

Reservoir: A porous and permeable underground formation containing an individual and separate natural accumulation of producible hydrocarbons (crude oil and/or natural gas) which is confined by impermeable rock or water barriers and is characterized by a single natural pressure system.

Residue gas: The natural gas remaining after being processed or treated.

Shale gas: Natural gas produced from organic (black) shale formations.

Tailgate: The point at which processed natural gas and NGLs leave a processing facility for end-user markets.

TBtu: One trillion British Thermal Units.

Tcf: One trillion cubic feet.

Throughput: The volume of natural gas or crude oil transported or passing through a pipeline, plant, terminal or other facility during a particular period.

Uncommitted Shippers (also known as "Walk-Up Shippers"): Customers of our Pony Express System that have not signed long-term shipper contracts and have rights under the FERC tariff as to rates and capacity allocation that are different than long-term committed shippers.

Wellhead: The equipment at the surface of a well that is used to control the well’s pressure; also, the point at which the hydrocarbons and water exit the ground.

Working gas: The volume of gas in the storage reservoir that is in addition to the cushion or base gas. It may or may not be completely withdrawn during any particular withdrawal season. Conditions permitting, the total working capacity could be used more than once during any season.

Working gas storage capacity: The maximum volume of natural gas that can be cost-effectively injected into a storage facility and extracted during the normal operation of the storage facility. Effective working gas storage capacity excludes base gas and non-cycling working gas.

X/d: The applicable measurement metric per day. For example, MMcf/d means one million cubic feet per day.

PART 1—FINANCIAL INFORMATION

Item 1. Financial Statements

TALLGRASS ENERGY PARTNERS, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	March 31, 2015			December 31, 2014
	(in thousands)
ASSETS
Current Assets:
Cash and cash equivalents	$	876		$	867
Accounts receivable, net	46,268			39,768
Receivable from related party	—			73,393
Gas imbalances	911			2,442
Inventories	12,679			13,045
Derivative assets at fair value	90			—
Prepayments and other current assets	2,728			2,766
Total Current Assets	63,552			132,281
Property, plant and equipment, net	1,921,676			1,853,081
Goodwill	343,288			343,288
Intangible asset, net	102,519			104,538
Deferred financing costs	5,119			5,528
Deferred charges and other assets	17,397			18,481
Total Assets	$	2,453,551		$	2,457,197
LIABILITIES AND PARTNERS’ EQUITY
Current Liabilities:
Accounts payable, including $41,363 and $45,534 related to variable interest entities	$	64,047		$	62,329
Accounts payable to related parties	3,000			3,915
Gas imbalances	3,490			3,611
Accrued taxes	15,308			3,989
Accrued liabilities	6,447			9,384
Other current liabilities	12,094			13,340
Total Current Liabilities	104,386			96,568
Long-term debt	698,000			559,000
Other long-term liabilities and deferred credits	6,213			6,478
Total Long-term Liabilities	704,213			565,478
Commitments and Contingencies
Equity:
Common unitholders (60,234,105 and 32,834,105 units issued and outstanding at March 31, 2015 and December 31, 2014, respectively)	1,630,447			800,333
Subordinated unitholder (0 and 16,200,000 units issued and outstanding at March 31, 2015 and December 31, 2014, respectively)	—			274,133
General partner (834,391 units issued and outstanding at March 31, 2015 and December 31, 2014)	(357,145		)	(35,743		)
Total Partners’ Equity	1,273,302			1,038,723
Noncontrolling interests	$	371,650		$	756,428
Total Equity	$	1,644,952		$	1,795,151
Total Liabilities and Equity	$	2,453,551		$	2,457,197

The accompanying notes are an integral part of these consolidated financial statements.

1

TALLGRASS ENERGY PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended March 31,
	2015			2014
	(in thousands, except per unit amounts)
Revenues:
Natural gas liquids sales	$	21,025		$	48,907
Natural gas sales	844			4,808
Natural gas transportation services	32,148			34,104
Crude oil transportation services	50,381			—
Processing and other revenues	10,277			6,960
Total Revenues	114,675			94,779
Operating Costs and Expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	19,593			48,206
Cost of transportation services (exclusive of depreciation and amortization shown below)	10,715			5,117
Operations and maintenance	9,575			8,013
Depreciation and amortization	20,605			8,309
General and administrative	12,689			6,649
Taxes, other than income taxes	11,297			1,956
Loss on sale of assets	4,483			—
Total Operating Costs and Expenses	88,957			78,250
Operating Income	25,718			16,529
Other (Expense) Income:
Interest expense, net	(3,440		)	(1,296		)
Equity in earnings of unconsolidated investment	—			444
Other income, net	712			940
Total Other (Expense) Income	(2,728		)	88
Net Income	22,990			16,617
Net loss attributable to noncontrolling interests	9,329			507
Net income attributable to partners	$	32,319		$	17,124
Allocation of income to the limited partners:
Net income attributable to partners	$	32,319		$	17,124
Predecessor operations interest in net income	—			(4,224		)
General partner interest in net income	(7,438		)	(382		)
Common and subordinated unitholders' interest in net income	24,881			12,518
Basic net income per common and subordinated unit	$	0.47		$	0.31
Diluted net income per common and subordinated unit	$	0.46		$	0.30
Basic average number of common and subordinated units outstanding	52,727			40,500
Diluted average number of common and subordinated units outstanding	53,994			41,272

The accompanying notes are an integral part of these consolidated financial statements.

2

TALLGRASS ENERGY PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Cash Flows from Operating Activities:
Net income	$	22,990		$	16,617
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	21,557			8,638
Noncash compensation expense	1,527			941
Loss on sale of assets	4,483			—
Changes in components of working capital:
Accounts receivable and other	(5,678		)	1,356
Gas imbalances	143			321
Inventories	(2,754		)	(887		)
Accounts payable and accrued liabilities	6,546			(6,623		)
Other operating, net	(175		)	7,240
Net Cash Provided by Operating Activities	48,639			27,603
Cash Flows from Investing Activities:
Capital expenditures	(13,300		)	(209,111		)
Acquisition of additional 33.3% membership interest in Pony Express	(700,000		)	—
Other investing, net	(311		)	(1,910		)
Net Cash Used in Investing Activities	(713,611		)	(211,021		)
Cash Flows from Financing Activities:
Proceeds from public offerings, net of offering costs	551,949			—
Borrowings under revolving credit facility, net	139,000			—
Contributions from Predecessor Member, net	—			195,299
Distributions to unitholders	(28,294		)	(13,082		)
Other financing, net	2,326			1,201
Net Cash Provided by Financing Activities	664,981			183,418
Net Change in Cash and Cash Equivalents	9			—
Cash and Cash Equivalents, beginning of period	867			—
Cash and Cash Equivalents, end of period	$	876		$	—
Schedule of Noncash Investing and Financing Activities:
Property, plant and equipment acquired via the cash management agreement with TD	$	72,407		$	—
Increase in accrual for payment of property, plant and equipment	$	1,179		$	53,542

The accompanying notes are an integral part of these consolidated financial statements.

3

TALLGRASS ENERGY PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL

(UNAUDITED)

	Predecessor Equity		Limited Partners						General Partner			Total Partners’ Equity			Noncontrolling Interests			Total Equity
			Common			Subordinated
	(in thousands)
Balance at January 1, 2015	$	—	$	800,333		$	274,133		$	(35,743	)	$	1,038,723		$	756,428		$	1,795,151
Net income (loss)	—		19,701			5,180			7,438			32,319			(9,329		)	22,990
Issuance of units to public, net of offering costs	—		551,949			—			—			551,949			—			551,949
Distributions to unitholders	—		(15,925		)	(7,857		)	(4,512		)	(28,294		)	—			(28,294		)
Noncash compensation expense	—		2,933			—			—			2,933			—			2,933
Contributions from noncontrolling interest	—		—			—			—			—			2,379			2,379
Distributions to noncontrolling interest	—		—			—			—			—			(2,156		)	(2,156		)
Acquisition of additional 33.3% membership interest in Pony Express	—		—			—			(324,328		)	(324,328		)	(375,672		)	(700,000		)
Conversion of subordinated units	—		271,456			(271,456		)	—			—			—			—
Balance at March 31, 2015	$	—	$	1,630,447		$	—		$	(357,145	)	$	1,273,302		$	371,650		$	1,644,952
	Predecessor Equity		Limited Partners						General Partner			Total Partners’ Equity			Noncontrolling Interests			Total Equity
			Common			Subordinated
	(in thousands)
Balance at January 1, 2014	$	247,221	$	455,197		$	274,666		$	14,078		$	991,162		$	317,939		$	1,309,101
Net income (loss)	4,224		7,511			5,007			382			17,124			(507		)	16,617
Noncash compensation expense	—		2,176			—			—			2,176			—			2,176
Distributions to unitholders	—		(7,654		)	(5,103		)	(325		)	(13,082		)	—			(13,082		)
Contributions from Predecessor Member, net	63,170		—			—			—			63,170			132,129			195,299
Balance at March 31, 2014	$	314,615	$	457,230		$	274,570		$	14,135		$	1,060,550		$	449,561		$	1,510,111

The accompanying notes are an integral part of these consolidated financial statements.

4

TALLGRASS ENERGY PARTNERS, LP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1. Description of Business

Tallgrass Energy Partners, LP ("TEP" or the "Partnership") is a Delaware limited partnership formed in February 2013 to own, operate, acquire and develop midstream energy assets in North America. TEP currently provides natural gas transportation and storage services for customers in the Rocky Mountain and Midwest regions of the United States through the Tallgrass Interstate Gas Transmission System, which we refer to as the TIGT System, and the Trailblazer Pipeline. TEP provides crude oil transportation to customers in Wyoming and the surrounding region, servicing the Bakken oil production area of North Dakota and eastern Montana through our membership interest in Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a crude oil pipeline system commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma. We refer to this crude oil pipeline system as the Pony Express System. TEP also provides services for customers in Wyoming at its Casper and Douglas natural gas processing facilities, or collectively the Midstream Facilities, and provides water business services to customers in Colorado and Texas through BNN Water Solutions, LLC ("Water Solutions"). TEP's operations are strategically located in and provide services to certain key United States hydrocarbon basins, including the Denver-Julesburg, Powder River, Wind River, Permian and Hugoton-Anadarko Basins and the Niobrara, Mississippi Lime, Eagle Ford and Bakken shale formations.

The 33,878,625 common units held by the public constitute approximately 56.2% of TEP’s aggregate outstanding common units and approximately 55.5% of TEP’s aggregate outstanding common and general partner units at March 31, 2015. Tallgrass Development, LP ("TD") held 26,355,480 common units at March 31, 2015, including the 16,200,000 subordinated units converted to common units on February 17, 2015, as discussed further in Note 10 - Partnership Equity and Distributions, which comprised approximately 43.8% of TEP’s aggregate outstanding common units and approximately 43.2% of TEP’s aggregate outstanding common and general partner units. In addition, 834,391 general partner units, representing an approximate 1.4% general partner interest in TEP at March 31, 2015, and all of the incentive distribution rights ("IDRs") are held by Tallgrass MLP GP, LLC (the "general partner"). The partnership agreement requires TEP to distribute its available cash on a quarterly basis, subject to certain terms and conditions. For additional information, see Note 10 - Partnership Equity and Distributions.

The term "Trailblazer Predecessor" refers to Trailblazer Pipeline Company LLC ("Trailblazer") for the period from November 13, 2012 to its acquisition by TEP on April 1, 2014, and the term "Pony Express Predecessor" refers to Pony Express for the period from November 13, 2012 to September 1, 2014, the date on which TEP acquired a controlling 33.3% membership interest. Trailblazer Predecessor and Pony Express Predecessor are collectively referred to as the Predecessor Entities, as further discussed in Note 2 – Summary of Significant Accounting Policies. Financial results for all prior periods have been recast to reflect the operations of the Predecessor Entities. Predecessor Equity as presented in the condensed consolidated financial statements represents the capital account activity of Trailblazer Predecessor prior to April 1, 2014 and of Pony Express Predecessor prior to September 1, 2014. For additional information regarding these acquisitions, see Note 4 – Acquisitions.

2. Summary of Significant Accounting Policies

Basis of Presentation

These unaudited condensed consolidated financial statements and related notes for the three months endedMarch 31, 2015 and 2014 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board’s Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include disclosures required by GAAP for annual periods. The unaudited condensed consolidated financial statements for the three months ended ended March 31, 2015 and 2014 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair presentation of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation.

TEP’s financial results for the three months endedMarch 31, 2015 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2015. These unaudited condensed consolidated financial statements should be read in conjunction with TEP’s audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”) filed with the United States Securities and Exchange Commission (the “SEC”) on February 19, 2015.

5

The accompanying condensed consolidated financial statements of TEP include historical cost-basis accounts of the assets of Trailblazer for the periods prior to April 1, 2014, the date TEP acquired Trailblazer from TD, and Pony Express for the periods prior to September 1, 2014, the date TEP acquired a controlling 33.3% membership interest in Pony Express, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis.

As further discussed in Note 4 – Acquisitions, TEP closed the acquisition of Trailblazer on April 1, 2014 and the acquisition of a 33.3% membership interest in Pony Express effective September 1, 2014. As the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are considered transactions between entities under common control, and a change in reporting entity, the financial information presented for prior periods has been recast to include Trailblazer and the initial 33.3% membership interest in Pony Express for all periods presented. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to March 1, 2015 have not been recast to reflect the additional 33.3% membership interest.

The condensed consolidated financial statements include the accounts of TEP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net equity contributions of the Predecessor Entities included in the condensed consolidated statements of cash flows represent transfers of cash as a result of TD’s centralized cash management systems prior to April 1, 2014 for Trailblazer and September 1, 2014 for Pony Express, under which cash balances were swept daily and recorded as loans from the subsidiaries to TD. These loans were then periodically recorded as equity distributions. Pony Express participates in a cash management agreement with TD, which holds a 33.3% common membership interest in Pony Express, under which cash balances are swept daily and recorded as loans from Pony Express to TD.

Net income or loss from consolidated subsidiaries that are not wholly-owned by TEP is attributed to TEP and noncontrolling interests. This is done in accordance with substantive profit sharing arrangements, which generally follow the allocation of cash distributions and may not follow the respective ownership percentages held by TEP. Concurrent with TEP's acquisition of an initial 33.3% membership interest in Pony Express effective September 1, 2014, TEP, TD, and Pony Express entered into the Second Amended and Restated Limited Liability Agreement of Tallgrass Pony Express Pipeline, LLC ("the Second Amended Pony Express LLC Agreement"), which provided TEP a minimum quarterly preference payment of $16.65 million (prorated to approximately $5.4 million for the quarter ended September 30, 2014) through the quarter ending September 30, 2015. Effective March 1, 2015 with TEP's acquisition of an additional 33.3% membership interest in Pony Express, the Second Amended Pony Express LLC Agreement was further amended (as amended, "the Pony Express LLC Agreement") to increase the minimum quarterly preference payment to $36.65 million (prorated to approximately $23.5 million for the quarter ended March 31, 2015) and extend the term of the preference period through the quarter ending December 31, 2015. The Pony Express LLC Agreement provides that the net income or loss of Pony Express be allocated, to the extent possible, consistent with the allocation of Pony Express cash distributions. Under the terms of the Pony Express LLC Agreement, Pony Express distributions and net income for periods beginning after December 31, 2015 will be attributed to TEP and noncontrolling interests in accordance with the respective ownership interests.

A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity’s economic performance. TEP has presented separately in its condensed consolidated balance sheets, to the extent material, the assets of its consolidated VIE that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of TEP's consolidated VIE for which creditors do not have recourse to TEP's general credit. Pony Express is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, TEP has determined that it is the primary beneficiary as it has the power to direct matters that most significantly impact the activities of Pony Express and has the right to receive benefits of Pony Express that could potentially be significant to Pony Express. TEP has consolidated Pony Express accordingly. For additional information see Note 3 – Variable Interest Entities.

6

Use of Estimates

Certain amounts included in or affecting these consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on TEP’s business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.

Accounting Pronouncements Issued But Not Yet Effective

Accounting Standards Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)"

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract.

The amendments in ASU 2014-09 are effective for public entities for annual reporting periods beginning after December 15, 2016, and for interim periods within that reporting period. Early application is not permitted. TEP is currently evaluating the impact of ASU 2014-09.

ASU No. 2014-12, "Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period"

In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides explicit guidance on accounting for share-based payments requiring a specific performance target to be achieved in order for employees to become eligible to vest in the awards when that performance target may be achieved after the requisite service period for the award. The ASU requires that such performance targets be treated as a performance condition, and should not be reflected in the estimate of the grant-date fair value of the award. Instead, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved.

ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of ASU 2014-12 is not expected to have a material impact on TEP's financial position and results of operations.

ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis"

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 will change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 will modify the evaluation of whether limited partnerships and other similar legal entities are considered VIEs or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, and change certain aspects of the consolidation analysis for reporting entities that are involved with VIEs, particularly for those with fee arrangements and related party relationships.

The amendments in ASU 2015-02 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early application is permitted, including adoption in an interim period. TEP is currently evaluating the impact of ASU 2015-02.

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3. Variable Interest Entities

TEP does not have the obligation to absorb losses from Pony Express during the preference period as a result of the minimum quarterly preference payments as discussed in Note 4 – Acquisitions. In addition, for the period from the acquisition of the initial 33.3% membership interest effective September 1, 2014 to the acquisition of an additional 33.3% membership interest effective March 1, 2015, TEP, as the managing member of Pony Express, had voting rights disproportionate to its ownership interest. As a result, TEP has determined that Pony Express is a VIE of which TEP is the primary beneficiary and consolidates Pony Express accordingly.

TEP has not provided any additional financial support to Pony Express other than its initial capital contribution of $570 million and has no contractual commitments or obligations to provide additional financial support. In the event that the costs of construction of the Pony Express System and lateral in Northeast Colorado exceed the $270 million retained by Pony Express as discussed in Note 4 – Acquisitions, TD is obligated to fund the remaining costs.

The carrying amounts and classifications of the Pony Express assets and liabilities included in TEP's condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Current assets	$	27,315	$	93,019
Noncurrent assets	1,362,803		1,300,816
Total assets	$	1,390,118	$	1,393,835
Current liabilities	$	57,336	$	52,547
Total liabilities	$	57,336	$	52,547

4. Acquisitions

TEP Acquisition of Trailblazer

On April 1, 2014, TEP closed the acquisition of Trailblazer from a wholly owned subsidiary of TD for total consideration valued at approximately $164 million, consisting of $150 million in cash and the issuance of 385,140 common units (valued at approximately $14 million based on the March 31, 2014 closing price of TEP’s common units). On that same date, the general partner contributed additional capital in the amount of approximately $263,000 in exchange for the issuance of 7,860 general partner units in order to maintain its 2% general partner interest. The acquisition of Trailblazer represents a change in reporting entity and a transaction between entities under common control. The excess purchase price over the net book value of Trailblazer's assets and liabilities was accounted for as a deemed distribution as discussed further in Note 10 – Partnership Equity and Distributions.

TEP Acquisitions of 66.7% of Pony Express

Effective September 1, 2014, TEP acquired a controlling 33.3% membership interest in Pony Express for total consideration of approximately $600 million. At closing, Pony Express, TD, and TEP entered into a Second Amended and Restated Limited Liability Company Agreement of Pony Express effective September 1, 2014, which sets forth the relative rights of TD and TEP as the owners of Pony Express. Of the total consideration of $600 million, TEP directly paid TD $30 million, consisting of $27 million in cash and 70,340 TEP common units with an aggregate fair value of approximately $3 million, in exchange for the transfer by TD to TEP of a 1.9585% membership interest in Pony Express (computed before giving effect to the issuance of the new membership interest by Pony Express to TEP). TEP also contributed cash of $570 million to Pony Express in exchange for a newly issued membership interest which, when combined with the membership interest transferred from TD and the parties' entry at closing into the Second Amended and Restated Limited Liability Company Agreement of Pony Express, constituted TEP's 33.3% membership interest in Pony Express, which represented 100% of the preferred membership units issued by Pony Express. Of the $570 million cash consideration received by Pony Express, $300 million was immediately distributed to TD at closing and $270 million was retained by Pony Express to fund the estimated remaining costs of construction for the Pony Express System and the lateral in Northeast Colorado. The $270 million cash balance was subsequently swept to TD under a cash management agreement between Pony Express and TD and was recorded as a related party loan which bears interest at TD's incremental borrowing rate. There was no remaining balance outstanding on the related party loan at March 31, 2015.

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The terms of TEP's first acquisition of a 33.3% membership interest in Pony Express provided TEP a minimum quarterly preference payment of $16.65 million through the quarter ending September 30, 2015 (prorated to approximately $5.4 million for the quarter ended September 30, 2014) with distributions thereafter shared in accordance with the terms of the Second Amended Pony Express LLC Agreement. At the effective date of that transaction, TEP determined that Pony Express was a VIE of which TEP was the primary beneficiary, and consolidated Pony Express accordingly. For additional discussion and disclosure, see Note 3 – Variable Interest Entities. The acquisition of the initial 33.3% membership interest in Pony Express represented a transaction between entities under common control and a change in reporting entity.

Effective March 1, 2015, TEP acquired an additional 33.3% membership interest in Pony Express for cash consideration of approximately $700 million. At closing, Pony Express, TD, and TEP entered into the Pony Express LLC Agreement effective March 1, 2015, which sets forth the relative rights of TD and TEP as the owners of Pony Express. The terms of the transaction increased the minimum quarterly preference payment provided to TEP to $36.65 million through the quarter ending December 31, 2015 (prorated to approximately $23.5 million for the quarter ended March 31, 2015) with distributions thereafter shared in accordance with the terms of the Pony Express LLC Agreement.

Upon the effective date of the transaction, TEP reevaluated its VIE assessment and determined that Pony Express continues to be considered a VIE of which TEP is the primary beneficiary. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to the transaction have not been recast to reflect the additional 33.3% membership interest.

Historical Financial Information

The results of our acquisitions of Trailblazer and 66.7% membership interest in Pony Express are included in the condensed consolidated balance sheet as of March 31, 2015. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated balance sheet as of December 31, 2014. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income for the three months ended March 31, 2015 and 2014. The results of our acquisition of an additional 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income prospectively beginning March 1, 2015.

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The following tables present the previously reported condensed consolidated statements of income for the three months ended March 31, 2014, adjusted for the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express:

	Three Months Ended March 31, 2014
	TEP			Consolidate Trailblazer Pipeline Company LLC		Consolidate Tallgrass Pony Express Pipeline, LLC			TEP (As currently reported)
	(in thousands)
Revenues:
Natural gas liquids sales	$	48,907		$	—	$	—		$	48,907
Natural gas sales	2,196			2,612		—			4,808
Transportation services	27,051			7,053		—			34,104
Processing and other revenues	6,808			152		—			6,960
Total Revenues	84,962			9,817		—			94,779
Operating Costs and Expenses:
Cost of sales	45,543			2,663		—			48,206
Cost of transportation services	4,903			214		—			5,117
Operations and maintenance	7,286			727		—			8,013
Depreciation and amortization	6,514			1,038		757			8,309
General and administrative	6,201			448		—			6,649
Taxes, other than income taxes	1,456			500		—			1,956
Total Operating Costs and Expenses	71,903			5,590		757			78,250
Operating Income (Loss)	13,059			4,227		(757		)	16,529
Other (Expense) Income:
Interest (expense) income, net	(1,324		)	31		(3		)	(1,296		)
Equity in earnings of unconsolidated investment	444			—		—			444
Other income, net	721			219		—			940
Total Other (Expense) Income	(159		)	250		(3		)	88
Net Income (Loss)	12,900			4,477		(760		)	16,617
Net loss attributable to noncontrolling interests	—			—		507			507
Net income (loss) attributable to partners	$	12,900		$	4,477	$	(253	)	$	17,124

Formation of BNN Water Solutions, LLC

On November 26, 2013, TEP, through its wholly-owned subsidiary Tallgrass Energy Investments, LLC ("TEI"), entered into a joint venture agreement with BNN Energy LLC ("BNN") to form Grasslands Water Services I, LLC ("GWSI"). GWSI subsequently built and began operating an intrastate water pipeline in Colorado. TEP accounted for its 50% equity interest in GWSI as an equity method investment. On May 13, 2014, TEI entered into a contribution agreement with BNN and several other parties to form a new entity known as BNN Water Solutions, LLC ("Water Solutions"). Under the terms of the contribution agreement, TEI agreed to contribute its existing 50% interest in GWSI, along with $7.6 million cash, in exchange for an 80% membership interest in Water Solutions. As part of the transaction, GWSI was renamed BNN Redtail, LLC ("Redtail"), became a subsidiary of Water Solutions, and issued preferred equity interests to TEI. Among the assets contributed by BNN and the other parties to the transaction were the other 50% interest in Redtail and a 100% equity interest in Alpha Reclaim Technology, LLC ("Alpha"), a company which sources treated wastewater from municipalities in Texas. Alpha is wholly-owned by Redtail.

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Upon closing of the transaction, TEP obtained a controlling financial interest in Water Solutions and accordingly has accounted for the transaction as a step acquisition under ASC 805. On the acquisition date, TEP remeasured its previously held 50% equity interest in Redtail to its fair value of $11.9 million, recognized a gain of $9.4 million, and consolidated Water Solutions. The 20% equity interest in Water Solutions held by noncontrolling interests was recorded at its acquisition date fair value of $1.4 million. The fair values of the previously held equity interest and the noncontrolling interest were determined using a discounted cash flow analysis. These fair value measurements are based on significant inputs that are not observable in the market and thus represent fair value measurements categorized within Level 3 of the fair value hierarchy under ASC 820.

At March 31, 2015, the assets acquired and liabilities assumed in the acquisition were recorded at provisional amounts based on the preliminary purchase price allocation. TEP is in the process of obtaining additional information to identify and measure all assets acquired and liabilities assumed in the acquisition within the measurement period. Such provisional amounts will be adjusted if necessary to reflect any new information about facts and circumstances that existed at the acquisition date that, if known, would have affected the measurement of these amounts.

Pro forma revenue and net income attributable to TEP for the three months ended March 31, 2014 was $96.7 million and $17.4 million, respectively. This unaudited pro forma financial information for TEP is presented as if the acquisition of Water Solutions had been completed on January 1, 2014. The pro forma financial information is not necessarily indicative of what the actual results of operations or financial position of TEP would have been if the transactions had in fact occurred on the date or for the period indicated, nor do they purport to project the results of operations or financial position of TEP for any future periods or as of any date. The pro forma financial information does not give effect to any cost savings, operating synergies, or revenue enhancements expected to result from the transactions or the costs to achieve these cost savings, operating synergies, and revenue enhancements. The pro forma revenue and net income includes adjustments for the three months ended March 31, 2014 to give effect to the following:

(a) Reduction in net income attributable to TEP to remove equity in earnings of GWSI recorded for the period from January 1, 2014 to March 31, 2014.

(b) Increase in revenue and net income attributable to TEP to reflect TEP's consolidated 80% interest in the operations of GWSI for the period from January 1, 2014 to March 31, 2014.

5. Related Party Transactions

TEP has no employees. TD, through its wholly-owned subsidiary Tallgrass Operations, LLC ("Tallgrass Operations"), provided and charged TEP for direct and indirect costs of services  provided to us or incurred on our behalf including employee labor costs, information technology services, employee health and retirement benefits, and all other expenses necessary or appropriate to the conduct of our business. TEP recorded these costs on the accrual basis in the period in which TD incurred them. On May 17, 2013, in connection with the closing of TEP’s initial public offering, TEP and its general partner entered into an Omnibus Agreement with TD and certain of its affiliates, including Tallgrass Operations (the "Omnibus Agreement"). The Omnibus Agreement provides that, among other things, TEP will reimburse TD and its affiliates for all expenses they incur and payments they make on TEP’s behalf, including the costs of employee and director compensation and benefits as well as the cost of the provision of certain centralized corporate functions performed by TD, including legal, accounting, cash management, insurance administration and claims processing, risk management, health, safety and environmental, information technology and human resources in each case to the extent reasonably allocable to TEP.

For the first quarter of 2015, TEP’s general and administrative costs under the Omnibus Agreement were $5.4 million, excluding costs attributable to Pony Express. Pony Express had general and administrative costs for the first quarter of 2015 of $5.2 million. TEP also pays a quarterly reimbursement to TD for costs associated with being a public company. The quarterly public company reimbursement was $635,000 for the first quarter of 2015. These amounts will be periodically reviewed and adjusted as necessary to continue to reflect reasonable allocation of costs to TEP.

Due to the cash management agreement discussed in Note 2 – Summary of Significant Accounting Policies, intercompany balances at the Predecessor Entities were periodically settled and treated as equity distributions prior to April 1, 2014 for Trailblazer and prior to September 1, 2014 for Pony Express. Balances lent to TD under the Pony Express cash management agreement effective September 1, 2014 are classified as related party receivables in the condensed consolidated balance sheets. TEP recognized interest income from TD of $0.4 million during the three months ended March 31, 2015 on the receivable balance under the Pony Express cash management agreement.

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Totals of transactions with affiliated companies are as follows:

	Three Months Ended March 31,
	2015		2014
	(in thousands)
Charges to TEP: (1)
Property, plant and equipment, net	$	1,307	$	3,400
Operation and maintenance	$	5,423	$	4,348
General and administrative	$	9,256	$	4,927

⁽¹⁾  Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.

Details of balances with affiliates included in "Receivable from related party" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Receivable from related party:
Tallgrass Operations, LLC	$	—	$	73,393
Total receivable from related party	$	—	$	73,393
Accounts payable to related parties:
Tallgrass Operations, LLC	$	2,980	$	3,894
Rockies Express Pipeline LLC	11		21
Deeprock Development, LLC	9		—
Total accounts payable to related parties	$	3,000	$	3,915

Balances of gas imbalances with affiliated shippers are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Affiliate gas balance receivables	$	168	$	275
Affiliate gas balance payables	$	410	$	455

6. Inventory

The components of inventory at March 31, 2015 and December 31, 2014 consisted of the following:

	March 31, 2015		December 31, 2014
	(in thousands)
Gas in underground storage	$	6,055	$	8,896
Materials and supplies	4,600		3,049
Crude oil	1,592		581
Natural gas liquids	432		519
Total inventory	$	12,679	$	13,045

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7. Property, Plant and Equipment

A summary of net property, plant and equipment by classification is as follows:

	March 31, 2015			December 31, 2014
	(in thousands)
Crude oil pipelines	$	961,288		$	939,536
Natural gas pipelines	553,425			548,482
Processing and treating assets	237,049			241,671
General and other	52,666			42,719
Construction work in progress	194,638			139,873
Accumulated depreciation and amortization	(77,390		)	(59,200		)
Total property, plant and equipment, net	$	1,921,676		$	1,853,081

8. Risk Management

TEP occasionally enters into derivative contracts with third parties for the purpose of hedging exposures that accompany their normal business activities. TEP’s normal business activities directly and indirectly expose them to risks associated with changes in the market price of crude oil and natural gas, among other commodities. Specifically, the risks associated with changes in the market price of natural gas include, among others (i) pre-existing or anticipated physical natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. TEP has elected not to apply hedge accounting and changes in the fair value of all derivative contracts are recorded in earnings in the period in which the change occurs.

Fair Value of Derivative Contracts

The following table summarizes the fair values of TEP’s derivative contracts included in the condensed consolidated balance sheets:

	Balance Sheet Location	March 31, 2015		December 31, 2014
		(in thousands)
Energy commodity derivative contracts	Current assets	$	90	$	—

As of March 31, 2015, the fair value shown for commodity contracts was comprised of derivative volumes for short natural gas fixed-price swaps totaling 0.9 Bcf. As of December 31, 2014 there were no derivative contracts outstanding.

Effect of Derivative Contracts in the Statements of Income

The following table summarizes the impact of derivative contracts for the three months ended March 31, 2015 and 2014:

		Amount of gain (loss) recognized in income on derivatives
	Location of gain (loss) recognized in income on derivatives	Three Months Ended March 31,
		2015		2014
		(in thousands)
Derivatives not designated as hedging contracts:
Energy commodity derivative contracts	Natural gas sales	$	90	$	(351	)

Credit Risk

TEP has counterparty credit risk as a result of its use of derivative contracts. TEP’s counterparties consist of major financial institutions. This concentration of counterparties may impact TEP’s overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions.

TEP maintains credit policies that it believes minimize its overall credit risk. These policies include (i) evaluation of potential counterparties’ financial condition (including credit ratings), (ii) collateral requirements under certain circumstances and (iii) the use of standardized agreements which allow for netting of positive and negative exposure associated with a single counterparty. Based on its policies and exposure, TEP’s management does not currently anticipate a material adverse effect on TEP’s financial position, results of operations, or cash flows as a result of counterparty performance.

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TEP’s over-the-counter swaps are entered into with counterparties outside central trading organizations such as a futures, options or stock exchange. These contracts are with financial institutions with investment grade credit ratings. While TEP enters into derivative transactions principally with investment grade counterparties and actively monitors their credit ratings, it is nevertheless possible that from time to time losses will result from counterparty credit risk in the future. The maximum potential exposure to credit losses on TEP’s derivative contracts at March 31, 2015 was:

	Asset Position
	(in thousands)
Gross	$	90
Netting agreement impact	—
Cash collateral held	—
Net Exposure	$	90

In addition, when the market value of TEP’s derivative contracts with specific counterparties exceeds established limits, TEP is required to provide collateral to its counterparties, which may include posting letters of credit or placing cash in margin accounts. Accordingly, entity valuation adjustments are necessary to reflect the effect of TEP’s own credit quality on the fair value of TEP’s net liability position with each counterparty. The methodology to determine this adjustment is consistent with how TEP evaluates counterparty credit risk, taking into account current credit spreads for its comparative industry sector, as well as any change in such spreads since the last measurement date. As of March 31, 2015 and December 31, 2014, TEP did not have any outstanding letters of credit or cash in margin accounts in support of its hedging of commodity price risks associated with the sale of natural gas nor did TEP have margin deposits with counterparties associated with energy commodity contract positions.

Fair Value

Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). Exchange-traded derivative contracts typically fall within Level 1 of the fair value hierarchy if they are traded in an active market. TEP values exchange-traded derivative contracts using quoted market prices for identical securities.

OTC derivatives are valued using models utilizing a variety of inputs including contractual terms and commodity and interest rate curves. The selection of a particular model and particular inputs to value an OTC derivative contract depends upon the contractual terms of the instrument as well as the availability of pricing information in the market. TEP uses similar models to value similar instruments. For OTC derivative contracts that trade in liquid markets, such as generic forwards and swaps, model inputs can generally be verified and model selection does not involve significant management judgment. Such contracts are typically classified within Level 2 of the fair value hierarchy.

Certain OTC derivative contracts trade in less liquid markets with limited pricing information; as such, the determination of fair value for these derivative contracts is inherently more difficult. Such contracts are classified within Level 3 of the fair value hierarchy. The valuations of these less liquid OTC derivatives are typically impacted by Level 1 and/or Level 2 inputs that can be observed in the market, as well as unobservable Level 3 inputs. Use of a different valuation model or different valuation input values could produce a significantly different estimate of fair value. However, derivative contracts valued using inputs unobservable in active markets are generally not material to TEP’s financial statements.

When appropriate, valuations are adjusted for various factors including credit considerations. Such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate is used.

The following table summarizes the fair value measurements of TEP’s energy commodity derivative contracts as of March 31, 2015 based on the fair value hierarchy established by the Codification:

			Asset fair value measurements using
	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(in thousands)
TEP as of March 31, 2015
Energy commodity derivative contracts	$	90	$	—	$	90	$	—

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9. Long-term Debt

The following table sets forth the outstanding borrowings, letters of credit issued, and available borrowing capacity under TEP's revolving credit facility as of March 31, 2015 and December 31, 2014:

	March 31, 2015			December 31, 2014
	(in thousands)
Total capacity under the revolving credit facility	$	850,000		$	850,000
Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
Available capacity under the revolving credit facility	$	152,000		$	291,000

The revolving credit facility contains various covenants and restrictive provisions that, among other things, limit or restrict TEP’s ability (as well as the ability of TEP’s restricted subsidiaries) to incur or guarantee additional debt, incur certain liens on assets, dispose of assets, make certain distributions (including distributions from available cash, if a default or event of default under the credit agreement then exists or would result from making such a distribution), change the nature of TEP’s business, engage in certain mergers or make certain investments and acquisitions, enter into non-arms-length transactions with affiliates and designate certain subsidiaries as "Unrestricted Subsidiaries." In addition, TEP is required to maintain a consolidated leverage ratio of not more than 4.75 to 1.00 (which will be increased to 5.25 to 1.00 for certain measurement periods following the consummation of certain acquisitions) and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2015, TEP is in compliance with the covenants required under the revolving credit facility.

The unused portion of the revolving credit facility is subject to a commitment fee, which ranges from 0.300% to 0.500%, based on TEP’s total leverage ratio. As of March 31, 2015, the weighted average interest rate on outstanding borrowings was 2.20%.

Fair Value

The following table sets forth the carrying amount and fair value of TEP’s long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, but for which fair value is disclosed:

	Fair Value
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total		Carrying Amount
	(in thousands)
March 31, 2015	$	—	$	698,000	$	—	$	698,000	$	698,000
December 31, 2014	$	—	$	559,000	$	—	$	559,000	$	559,000

The long-term debt borrowed under the revolving credit facility is carried at amortized cost. As of March 31, 2015 and December 31, 2014, the fair value approximates the carrying amount for the borrowings under the revolving credit facility using a discounted cash flow analysis. TEP is not aware of any factors that would significantly affect the estimated fair value subsequent to March 31, 2015.

10. Partnership Equity and Distributions

February Public Offering

On February 27, 2015, TEP sold 10,000,000 common units representing limited partner interests in an underwritten public offering at a price of $50.82 per unit, or $49.29 per unit net of the underwriter's discount, for net proceeds of approximately $492.6 million after deducting the underwriter's discount and offering expenses paid by TEP. TEP used the net proceeds from the offering to fund a portion of the consideration for the acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions. Pursuant to the underwriters' option to purchase additional units, TEP sold an additional 1,200,000 common units representing limited partner interests to the underwriters at a price of $50.82 per unit, or $49.29 per unit net of the underwriter’s discount, for net proceeds of approximately $59.3 million after deducting the underwriter’s discount and offering expenses paid by TEP. TEP used the net proceeds from this additional purchase of common units to reduce borrowings under its revolving credit facility, a portion of which were used to fund the March 2015 acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions.

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Distributions to Holders of Common Units, Subordinated Units, General Partner Units and Incentive Distribution Rights

TEP’s partnership agreement requires TEP to distribute its available cash, as defined below, to unitholders of record on the applicable record date within 45 days after the end of each quarter, beginning with the quarter ended June 30, 2013. TEP’s partnership agreement provides that available cash, each quarter, is first distributed to the common unitholders and the general partner on a pro rata basis until each common unitholder has received $0.2875 per unit, which amount is defined in TEP’s partnership agreement as the minimum quarterly distribution ("MQD").

The following table shows the distributions for the periods indicated:

		Distributions
		Limited Partners Common and Subordinated Units		General Partner						Distributions per Limited Partner Unit
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2015	May 14, 2015 (1)	$	31,322	$	6,934	$	530	$	38,786	$	0.5200
December 31, 2014	February 13, 2015	23,782		4,039		473		28,294		0.4850
September 30, 2014	November 14, 2014	20,092		1,208		363		21,663		0.4100
June 30, 2014	August 14, 2014	18,596		758		330		19,684		0.3800
March 31, 2014	May 14, 2014	13,288		126		274		13,688		0.3250

⁽¹⁾  The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

Subordinated Units

Under the terms of TEP's partnership agreement and upon the payment of the quarterly cash distribution to unitholders on February 13, 2015, the subordination period ended. As a result, the 16,200,000 subordinated units held by TD converted into common units on a one for one basis on February 17, 2015. The conversion of the subordinated units did not impact the aggregate amount of cash distributions paid.

General Partner Units

As of March 31, 2015, the general partner owns an approximate 1.4% general partner interest in TEP, represented by 834,391 general partner units. Under TEP’s partnership agreement, the general partner may at any time (but is under no obligation to) contribute additional capital to TEP in order to maintain or attain a 2% general partner interest.

Incentive Distribution Rights

The general partner also owns all of the IDRs. IDRs represent the right to receive an increasing percentage (13%, 23% and 48%) of quarterly distributions of available cash from operating surplus after the MQD and the target distribution levels have been achieved. The general partner may transfer these rights separately from its general partner interest, subject to restrictions in TEP’s partnership agreement.

The following discussion related to incentive distributions assumes that TEP’s general partner holds a 2% general partner interest and continues to own all of the IDRs.

If for any quarter:

• TEP has distributed available cash from operating surplus to all of the common unitholders (and during the subordination period, to the subordinated unitholders) in an amount equal to the MQD for each outstanding unit for such quarter; and

• TEP has distributed available cash from operating surplus on outstanding common units in an amount necessary to eliminate any cumulative arrearages in the payment of the MQD to common unitholders;

then, TEP will distribute additional available cash from operating surplus for that quarter among the unitholders and the general partner in the following manner:

• first, 98% to all unitholders, pro rata, and 2% to TEP’s general partner, until each unitholder receives a total of $0.3048 per unit for that quarter (the "first target distribution");

• second, 85% to all unitholders, pro rata, and 15% to TEP’s general partner, until each unitholder receives a total of $0.3536 per unit for that quarter (the "second target distribution");

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• third, 75% to all unitholders, pro rata, and 25% to TEP’s general partner, until each unitholder receives a total of $0.4313 per unit for that quarter (the "third target distribution"); and

• thereafter, 50% to all unitholders, pro rata, and 50% to TEP’s general partner.

Definition of Available Cash

Available cash generally means, for any quarter, all cash and cash equivalents on hand at the end of that quarter:

• less, the amount of cash reserves established by TEP’s general partner to:

▪ provide for the proper conduct of TEP’s business (including reserves for future capital expenditures, for anticipated future credit needs subsequent to that quarter, for legal matters and for refunds of collected rates reasonably likely to be refunded as a result of a settlement or hearing related to FERC rate proceedings);

▪ comply with applicable law or regulation, or any of TEP’s debt instruments or other agreements; or

▪ provide funds for distributions to unitholders and to TEP’s general partner for any one or more of the next four quarters (provided that TEP’s general partner may not establish cash reserves for distributions if the effect of the establishment of such reserves will prevent TEP from distributing the MQD on all common units and any cumulative arrearages on such common units for the current quarter);

• plus, if TEP’s general partner so determines, all or any portion of the cash on hand on the date of distribution of available cash for the quarter, including cash on hand resulting from working capital borrowings made subsequent to the end of such quarter.

Other Contributions and Distributions

During the three months ended March 31, 2015, TEP was deemed to have made a noncash capital distribution of $324.3 million to the general partner, which represents the excess purchase price over the carrying value of the additional 33.3% membership interest in Pony Express acquired effective March 1, 2015. See Note 4 - Acquisitions for additional information regarding the transaction.

During the three months ended March 31, 2014, the Trailblazer Predecessor and Pony Express Predecessor recognized net contributions from TD of $195.3 million.

11. Net Income per Limited Partner Unit

The Partnership’s net income is allocated to the general partner and the limited partners, including the holders of the subordinated units, in accordance with their respective ownership percentages, after giving effect to incentive distributions paid to the general partner. Basic and diluted net income per limited partner unit is calculated by dividing limited partners’ interest in net income, less general partner incentive distributions, by the weighted average number of outstanding limited partner units during the period.

TEP computes earnings per unit using the two-class method for Master Limited Partnerships as prescribed in the FASB guidance. The two-class method requires that securities that meet the definition of a participating security be considered for inclusion in the computation of basic earnings per unit. Under the two-class method, earnings per unit is calculated as if all of the earnings for the period were distributed under the terms of the partnership agreement, regardless of whether the general partner has discretion over the amount of distributions to be made in any particular period, whether those earnings would actually be distributed during a particular period from an economic or practical perspective, or whether the general partner has other legal or contractual limitations on its ability to pay distributions that would prevent it from distributing all of the earnings for a particular period.

TEP calculates net income available to limited partners based on the distributions pertaining to the current period’s net income. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner and limited partners in accordance with the contractual terms of the partnership agreement and as further prescribed in the FASB guidance under the two-class method.

The two-class method does not impact TEP’s overall net income or other financial results; however, in periods in which aggregate net income exceeds its aggregate distributions for such period, it will have the impact of reducing net income per limited partner unit. This result occurs as a larger portion of TEP’s aggregate earnings, as if distributed, is allocated to the incentive distribution rights of the general partner, even though TEP makes distributions on the basis of available cash and not earnings. In periods in which TEP’s aggregate net income does not exceed its aggregate distributions for such period, the two-class method does not have any impact on our calculation of earnings per limited partner unit.

Basic earnings per unit is computed by dividing net earnings attributable to unitholders by the weighted average number of units outstanding during each period. Diluted earnings per unit reflects the potential dilution of common equivalent units that could occur if equity participation units are converted into common units.

All net income or loss from Trailblazer prior to its acquisition on April 1, 2014 and Pony Express prior to its acquisition effective September 1, 2014 is allocated to predecessor operations in the table below. Historical earnings of transferred businesses for periods prior to the date of the common control drop-down transaction are solely those of the general partner and, therefore we have appropriately excluded any allocation to the limited partner units when determining net income available to common and subordinated unitholders. We present the financial results of any transferred business prior to the drop down transaction date in the line item "Predecessor operations interest in net (income) loss" in the table below.

The following table illustrates the Partnership’s calculation of net income per common and subordinated unit for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015			2014
	(in thousands, except per unit amounts)
Net Income	$	22,990		$	16,617
Net loss attributable to noncontrolling interests	9,329			507
Net Income attributable to partners	32,319			17,124
Predecessor operations interest in net income	—			(4,224		)
General partner interest in net income	(7,438		)	(382		)
Common and subordinated unitholders' interest in net income	$	24,881		$	12,518
Basic net income per common and subordinated unit	$	0.47		$	0.31
Diluted net income per common and subordinated unit	$	0.46		$	0.30
Basic average number of common and subordinated units outstanding	52,727			40,500
Equity Participation Unit equivalent units	1,267			772
Diluted average number of common and subordinated units outstanding	53,994			41,272

12. Regulatory Matters

Tallgrass Interstate Gas Transmission

Pony Express Abandonment – FERC Docket CP12-495

On August 6, 2012, Tallgrass Interstate Gas Transmission, LLC, or TIGT, which owns the TIGT System, filed an application to: (1) abandon for FERC purposes approximately 433 miles of mainline natural gas pipeline facilities, along with associated rights of way and other related equipment (collectively, the "Pony Express Assets"), and the natural gas service therefrom, by transferring those assets to Pony Express, which subsequently converted the Pony Express Assets into crude oil pipeline facilities; and (2) construct and operate certain replacement-type facilities necessary to continue service to existing natural gas firm transportation customers following the conversion, which we refer to as the Replacement Gas Facilities. This project is referred to as the "Pony Express Abandonment." The FERC abandonment does not constitute an abandonment for accounting purposes. Pursuant to the terms of the Purchase and Sale Agreement filed with the FERC and cited by the FERC in approving the Pony Express Abandonment, Pony Express is required to reimburse TIGT for the net book value of the Pony Express Assets plus other TIGT incurred costs required to construct the Replacement Gas Facilities and to arrange substitute gas transportation services to certain TIGT shippers.

The Pony Express Abandonment and completion of the Pony Express Project by Pony Express re-deployed existing pipeline assets to meet the growing market need to transport oil supplies while at the same time continuing to operate TIGT’s natural gas transportation facilities to meet all current and expected needs of its natural gas customers. By a FERC order issued September 12, 2013, TIGT was granted authorization to abandon the Pony Express Assets and construct the Replacement Gas Facilities. On October 7, 2013 TIGT commenced the mobilization of personnel and equipment for the construction of the Replacement Gas Facilities necessary to complete the Pony Express Abandonment to continue service to existing TIGT customers. In December 2013, TIGT removed the Pony Express Assets from gas service and sold those assets to Pony Express. On May 1, 2014, TIGT commenced commercial service through all of the Replacement Gas Facilities, with the exception of Units 3 and 4 at the Tescott Compressor Station. Service through Units 3 and 4 at the Tescott Compressor Station commenced on May 30, 2014.

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Trailblazer

2013 Rate Case Filing - Docket No. RP13-1031

On July 1, 2013, Trailblazer made a rate filing with the FERC pursuant to Section 4 of the Natural Gas Act in Docket No. RP13-1031. In this filing, Trailblazer proposed an overall cost of service of $25.7 million, an increase of the base rates, rolled-in base and fuel rates, an overall rate of return of 10.94% and new depreciation rates. On July 31, 2013, the FERC issued an order accepting Trailblazer’s filing and suspending the filed tariff rates, subject to refund, for the full statutorily permitted five-month suspension period and setting certain issues for hearing. The FERC resolved the non-rate aspects of Trailblazer’s rate case in an order dated December 30, 2013.

In conjunction with this filing for rolled-in fuel rates, Trailblazer elected to not seek recovery of unrecovered fuel costs incurred prior to January 1, 2014. Consequently, Trailblazer has recognized expenses related to unrecovered fuel costs of $578,000 for the period from November 13, 2012 to December 31, 2012, $6.0 million for period from January 1, 2012 to November 12, 2012 and $8.4 million during the year ended December 31, 2013.

On January 22, 2014, Trailblazer, the FERC’s Trial Staff, and the active parties in the pipeline’s general rate case finalized a settlement in principle resolving the pending rate issues, including: (i) establishing transportation rates, as well as fuel and lost and unaccounted for charges; (ii) providing a limited profit sharing arrangement for certain revenues earned from interruptible and short-term firm transport; and (iii) setting the minimum and maximum time that can elapse before Trailblazer’s next rate case at the FERC. Trailblazer filed a motion with FERC’s Chief Administrative Law Judge to accept the settlement rates on an interim basis ("Interim Rates") while the participants finalized a definitive settlement. The Chief Administrative Law Judge accepted the Interim Rates effective February 1, 2014. On February 24, 2014, Trailblazer filed an uncontested offer of settlement ("Stipulation and Agreement") among active party shippers. The Stipulation and Agreement established the Interim Rates as final settlement rates effective February 1, 2014, subject to the issuance of refunds to certain shippers for January 2014 transportation services and revised fuel and lost and unaccounted for rates, effective July 1, 2014. On March 11, 2014, the Presiding Administrative Law Judge certified the Stipulation and Agreement. On May 29, 2014, the FERC approved the Stipulation and Agreement. On June 30, 2014, Trailblazer filed tariff sheets to implement the Stipulation and Agreement effective July 1, 2014. Estimated refunds were reserved from revenues recorded in January 2014. On July 1, 2014, Trailblazer submitted refunds to its customers for amounts collected in excess of amounts that would have been collected under the Settlement Rates, with interest, and on July 18, 2014, filed a report of refunds with the FERC. The FERC issued orders accepting the tariff sheets with the requested effective date of July 1, 2014 and accepting the refund report filing on July 25, 2014 and August 7, 2014, respectively.

2015 Annual Fuel Tracker Filing - Docket No. RP15-841-000

On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. This filing incorporates the revised fuel tracker and power cost tracker mechanisms agreed to in the 2013 Rate Case Filing settlement.

Pony Express

In anticipation of placing the Pony Express System into service, several petitions for declaratory orders were submitted to the FERC by Pony Express and certain upstream pipelines interconnected with the Pony Express System to address considerations related to the Pony Express System and other matters. In response to these petitions, the FERC issued three declaratory orders (two in 2012 and one in 2014) approving the proposed rate structures and terms of service for the Pony Express System.

On September 19, 2014 Pony Express filed with the FERC to adopt a tariff for initial local Non Contract Rates as well as initial Rules and Regulations in accordance with the Interstate Commerce Act to be effective starting on October 1, 2014. Local Contract Tariff rates were filed with the FERC on October 29, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express System from the Belle Fourche Pipeline were filed on October 16, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express pipeline system from Hiland Pipeline Company were filed on February 27, 2015 and effective April 1, 2015.

Other Regulatory Matters

There are currently no proceedings challenging the rates of Pony Express, TIGT, or Trailblazer. Regulators, as well as shippers, do have rights, under circumstances prescribed by applicable regulations, to challenge the rates that TIGT and Trailblazer charge. Further, the statute governing service by Pony Express allows parties having standing to file complaints in regard to existing tariff rates and provisions. If the complaint is not resolved, the FERC may conduct a hearing and order a crude oil pipeline to make reparations going back for up to two years prior to the date on which a complaint was filed if a rate is found to be unjust and unreasonable. TEP can provide no assurance that current rates will remain unchallenged. Any successful challenge could have a material, adverse effect on TEP’s future earnings and cash flows.

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13. Legal and Environmental Matters

Legal

In addition to the matters discussed below, TEP is a defendant in various lawsuits arising from the day-to-day operations of its business. Although no assurance can be given, TEP believes, based on its experiences to date, that the ultimate resolution of such routine items will not have a material adverse impact on its business, financial position, results of operations or cash flows.

TEP has evaluated claims in accordance with the accounting guidance for contingencies that it deems both probable and reasonably estimable and, accordingly, had aggregate reserves for legal claims of approximately $0.6 million as of March 31, 2015 and December 31, 2014.

TIGT

Prairie Horizon

On July 3, 2014, Prairie Horizon Agri-Energy LLC ("Prairie Horizon") filed an action in the District Court of Phillips County, Kansas against TIGT seeking damages from an alleged intrusion of foreign material and oil from TIGT into Prairie Horizon's ethanol plant. The matter was removed to the US District Court for the District of Kansas. Prairie Horizon asserts that this intrusion caused substantial damage to Prairie Horizon's ethanol production facilities and resulted in corresponding business income losses. Prairie Horizon also claims that the intrusion was a violation of TIGT's FERC Gas Tariff. Prairie Horizon alleges that it has suffered damages in the amount of approximately $2.0 million. TIGT believes Prairie Horizon's claims are without merit and plans to vigorously contest all of the claims in this matter.

System Failure

On June 13, 2013, a failure occurred on a segment of the TIGT pipeline system in Goshen County, Wyoming, resulting in the release of natural gas. The line was promptly brought back into service and the failure did not cause any known injuries, fatalities, fires or evacuations. TEP is currently working with PHMSA to develop a plan to close the Corrective Action Order received from PHMSA regarding the Goshen County failure and does not believe the cost of anticipated remediation activities will be material.

Pony Express

System Failures

On August 31, 2014, a leak occurred at the Sterling Pump Station on the Pony Express System in Logan County, Colorado, which resulted in a release of approximately 200 bbls of crude oil. The spill was entirely contained on TEP property and the costs to remediate were not material. In April 2015, PHSMA granted TEP's request to consider the Sterling Pump Station incident closed with no further action.

On March 12, 2015, an event occurred at the Yoder Pump Station in Goshen County, Wyoming, related to repair and replacement activities resulting in a spill of approximately 300 bbls of crude oil. TEP has presented its incident investigation findings to PHMSA and is currently working with PHMSA to resolve the matter. TEP does not believe the cost of anticipated remediation activities will be material.

Environmental

TEP is subject to a variety of federal, state and local laws that regulate permitted activities relating to air and water quality, waste disposal, and other environmental matters. TEP believes that compliance with these laws will not have a material adverse impact on its business, cash flows, financial position or results of operations. However, there can be no assurances that future events, such as changes in existing laws, the promulgation of new laws, or the development of new facts or conditions will not cause TEP to incur significant costs. TEP had environmental accruals of $5.2 million and $5.3 million at March 31, 2015 and December 31, 2014, respectively.

TMID

Casper Plant, U.S. EPA Notice of Violation

In August 2011, the U.S. EPA and the Wyoming Department of Environmental Quality ("WDEQ") conducted an inspection of the Leak Detection and Repair ("LDAR") Program at the Casper Gas Plant in Wyoming. In September 2011, TMID received a letter from the U.S. EPA alleging violations of the Standards of Performance of Equipment Leaks for Onshore Natural Gas Processing Plant requirements under the Clean Air Act. TMID received a letter from the U.S. EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the U.S. EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including attempted resolution of more recently identified LDAR issues.

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Casper Mystery Bridge Superfund Site

The Casper Gas Plant is part of the Mystery Bridge Road/U.S. Highway 20 Superfund Site also known as Casper Mystery Bridge Superfund Site. Remediation work at the Casper Gas Plant has been completed and TEP has requested that the portion of the site attributable to TEP be delisted from the National Priorities List.

Casper Gas Plant

On November 25, 2014, WDEQ issued a Notice of Violation for violations of Part 60 Subpart OOOO related to the Depropanizer project (wv-14388, issued 7/9/13) in Docket No. 5506-14. TMID had discussed the issues in a meeting with WDEQ in Cheyenne on November 17, 2014, and submitted a disclosure on November 20, 2014 detailing the regulatory issues and potential violations. The project triggered a modification of Subpart OOOO for the entire plant. The project equipment as well as plant equipment subjected to Subpart OOOO was not monitored timely, and initial notification was not made timely. Settlement negotiations with WDEQ are currently ongoing.

14. Reporting Segments

TEP’s operations are located in the United States. TEP is organized into three reporting segments: (1) Natural Gas Transportation & Logistics, (2) Crude Oil Transportation & Logistics, and (3) Processing & Logistics.

Natural Gas Transportation & Logistics

The Natural Gas Transportation & Logistics segment is engaged in ownership and operation of FERC-regulated interstate natural gas pipelines and integrated natural gas storage facilities that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. As discussed in Note 2–Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Trailblazer.

Crude Oil Transportation & Logistics

The Crude Oil Transportation & Logistics segment is engaged in ownership, construction, and operation of a FERC-regulated crude oil pipeline to serve the Bakken Shale and other nearby oil producing basins. The Pony Express System was placed in service in October 2014. The Crude Oil Transportation & Logistics segment also includes the construction of a lateral pipeline in Northeast Colorado, which will interconnect with the Pony Express System just east of Sterling, Colorado and is expected to be placed in service during the first half of 2015. As discussed in Note 2–Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Pony Express.

Processing & Logistics

The Processing & Logistics segment is engaged in ownership and operation of natural gas processing, treating and fractionation facilities that produce NGLs and residue gas that is sold in local wholesale markets or delivered into pipelines for transportation to additional end markets, as well as water business services provided primarily to the oil and gas exploration and production industry.

Corporate and Other

Corporate and Other includes corporate overhead costs that are not directly associated with the operations of TEP’s reportable segments, such as interest and fees associated with TEP’s revolving credit facility, public company costs reimbursed to TD, and equity-based compensation expense.

These segments are monitored separately by management for performance and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for their respective operations.

TEP considers Adjusted EBITDA as its primary segment performance measure as TEP believes it is the most meaningful measure to assess TEP’s financial condition and results of operations as a public entity. Adjusted EBITDA, a non-GAAP measure, is defined as net income excluding the impact of interest, income taxes, depreciation and amortization, non-cash income or loss related to derivative instruments, non-cash long-term compensation expense, impairment losses, gains or losses on asset or business disposals or acquisitions, gains or losses on the repurchase, redemption or early retirement of debt, and earnings from unconsolidated investments, but including the impact of distributions from unconsolidated investments.

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The following tables set forth TEP’s segment information for the periods indicated:

	Three Months Ended March 31, 2015							Three Months Ended March 31, 2014
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
			(in thousands)							(in thousands)
Natural Gas Transportation & Logistics	$	33,610	$	(1,346	)	$	32,264	$	39,631	$	(1,255	)	$	38,376
Crude Oil Transportation & Logistics	50,381		—			50,381		—		—			—
Processing & Logistics	32,030		—			32,030		56,403		—			56,403
Corporate and Other	—		—			—		—		—			—
Total revenue	$	116,021	$	(1,346	)	$	114,675	$	96,034	$	(1,255	)	$	94,779

	Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
Adjusted EBITDA:	Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA			Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA
	(in thousands)									(in thousands)
Natural Gas Transportation & Logistics	$	19,246		$	(1,346	)	$	17,900		$	19,862		$	(1,255	)	$	18,607
Crude Oil Transportation & Logistics	25,506			1,346			26,852			—			—			—
Processing & Logistics	8,718			—			8,718			9,596			—			9,596
Corporate and Other	(635		)	—			(635		)	(625		)	—			(625		)
Reconciliation to Net Income:
Interest expense, net							3,440									1,294
Depreciation and amortization expense, net of noncontrolling interest							20,533									7,804
Non-cash loss from asset sales							4,483									—
Non-cash (gain) loss related to derivative instruments							(90		)							351
Non-cash compensation expense							1,527									941
Distributions from unconsolidated investment							—									508
Equity in earnings of unconsolidated investment							—									(444		)
Non-cash loss allocated to noncontrolling interest							(9,377		)							—
Net Income attributable to partners							$	32,319								$	17,124

	Three Months Ended March 31,
Capital Expenditures:	2015		2014
			(in thousands)
Natural Gas Transportation & Logistics	$	3,865	$	9,626
Crude Oil Transportation & Logistics	6,480		196,437
Processing & Logistics	2,955		3,048
Corporate and Other	—		—
Total capital expenditures	$	13,300	$	209,111

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Assets:	March 31, 2015		December 31, 2014
	(in thousands)
Natural Gas Transportation & Logistics	$	719,510	$	716,106
Crude Oil Transportation & Logistics	1,391,417		1,394,793
Processing & Logistics	337,303		340,620
Corporate and Other	5,321		5,678
Total assets	$	2,453,551	$	2,457,197

15. Subsequent Events

Trailblazer Fuel Tracker Filing

On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. See Note 12 - Regulatory Matters for details.

Tallgrass Energy GP, LP Initial Public Offering

On May 6, 2015, Tallgrass Energy GP, LP (“TEGP”), a newly formed entity that is expected to own, directly or indirectly, all of TEP’s incentive distribution rights, TEP’s general partner interest, and 20,000,000 common units representing limited partner interests in TEP, announced the pricing of its initial public offering of 41,500,000 Class A shares representing limited partner interests in TEGP at $29.00 per Class A share. TEGP granted the underwriters an option to purchase up to an additional 6,225,000 Class A shares, which was exercised on May 7, 2015. TEGP anticipates closing its initial public offering on May 12, 2015.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

As used in this Quarterly Report, unless the context otherwise requires, "we," "us," "our," the "Partnership," "TEP" and similar terms refer to Tallgrass Energy Partners, LP, together with its consolidated subsidiaries. The term our "general partner" refers to Tallgrass MLP GP, LLC. References to "Tallgrass Development" or "TD" refer to Tallgrass Development, LP. Historical periods have been recast to reflect the operations of Trailblazer Pipeline Company LLC ("Trailblazer"), which was acquired on April 1, 2014, and Tallgrass Pony Express Pipeline, LLC ("Pony Express"), of which TEP acquired a controlling 33.3% membership interest effective September 1, 2014. The acquisition of the additional 33.3% membership interest in Pony Express represents an acquisition of noncontrolling interests. As a result, financial information for periods prior to the transaction have not been recast to reflect the additional 33.3% membership interest. In certain circumstances and for ease of reading we discuss the financial results of these entities prior to their respective acquisitions as being "our" financial results during historic periods, although Trailblazer was owned by TD from November 13, 2012 to March 31, 2014, and Pony Express was wholly-owned by TD from November 13, 2012 to August 31, 2014.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the unaudited condensed consolidated financial statements and related notes thereto included elsewhere in this Quarterly Report. Additionally, the following discussion and analysis should be read in conjunction with the audited financial statements and notes thereto, the related "Management's Discussion and Analysis of Financial Condition and Results of Operations," the discussion of "Risk Factors" and the discussion of TEP's "Business" in our Annual Report on Form 10-K for the year ended December 31, 2014 (our "2014 Form 10-K")

A reference to a "Note" herein refers to the accompanying Notes to Consolidated Financial Statements contained in Item 1.—Financial Statements. In addition, please read "Cautionary Statement Regarding Forward-Looking Statements" and "Risk Factors" for information regarding certain risks inherent in our business.

Cautionary Statement Regarding Forward-Looking Statements

This Quarterly Report and the documents incorporated by reference herein contain forward-looking statements concerning our operations, economic performance and financial condition. Forward-looking statements give our current expectations, contain projections of results of operations or of financial condition, or forecasts of future events. Words such as "could," "will," "may," "assume," "forecast," "position," "predict," "strategy," "expect," "intend," "plan," "estimate," "anticipate," "believe," "project," "budget," "potential," or "continue," and similar expressions are used to identify forward-looking statements. Without limiting the generality of the foregoing, forward-looking statements contained in this Annual Report include our expectations of plans, strategies, objectives, growth and anticipated financial and operational performance, including guidance regarding our and TD’s infrastructure programs, revenue projections, capital expenditures and tax position. Forward-looking statements can be affected by assumptions used or by known or unknown risks or uncertainties. Consequently, no forward-looking statements can be guaranteed.

A forward-looking statement may include a statement of the assumptions or bases underlying the forward-looking statement. We believe that we have chosen these assumptions or bases in good faith and that they are reasonable. However, when considering these forward-looking statements, you should keep in mind the risk factors and other cautionary statements in this Annual Report. Actual results may vary materially. You are cautioned not to place undue reliance on any forward-looking statements. You should also understand that it is not possible to predict or identify all such factors and should not consider the following list to be a complete statement of all potential risks and uncertainties. Factors that could cause our actual results to differ materially from the results contemplated by such forward-looking statements include:

• our ability to complete and integrate acquisitions from Tallgrass Development or from third parties, including our acquisitions of the Trailblazer Pipeline and of a 33.3% interest in Pony Express that were completed in 2014 and our acquisition of an additional 33.3% interest in Pony Express completed in 2015;

• changes in general economic conditions;

• competitive conditions in our industry;

• actions taken by third-party operators, processors and transporters;

• the demand for natural gas transportation, storage and processing services and crude oil transportation services;

• our ability to successfully implement our business plan;

• our ability to complete internal growth projects on time and on budget;

• the price and availability of debt and equity financing;

• the availability and price of natural gas and crude oil, and fuels derived from both, to the consumer compared to the price of alternative and competing fuels;

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• competition from the same and alternative energy sources;

• energy efficiency and technology trends;

• operating hazards and other risks incidental to transporting crude oil and transporting, storing and processing natural gas;

• natural disasters, weather-related delays, casualty losses and other matters beyond our control;

• interest rates;

• labor relations;

• large customer defaults;

• changes in tax status;

• the effects of existing and future laws and governmental regulations;

• the effects of future litigation; and

• certain factors discussed elsewhere in this Quarterly Report.

Forward-looking statements speak only as of the date on which they are made. While we may update these statements from time to time, we are not required to do so other than pursuant to the securities laws.

Overview

We are a publicly traded, growth-oriented Delaware limited partnership formed in 2013 to own, operate, acquire and develop midstream energy assets in North America. We currently provide natural gas transportation and storage services for customers in the Rocky Mountain and Midwest regions of the United States through the TIGT System and the Trailblazer Pipeline. We provide crude oil transportation to customers in Wyoming and the surrounding region, servicing the Bakken oil production area of North Dakota and eastern Montana through our membership interest in Pony Express, which owns the Pony Express System. We also provide services for customers in Wyoming at our Midstream Facilities, and we provide water business services to customers in Colorado and Texas through Water Solutions. Our operations are strategically located in and provide services to certain key United States hydrocarbon basins, including the Denver-Julesburg, Powder River, Wind River, Permian and Hugoton-Anadarko Basins and the Niobrara, Mississippi Lime, Eagle Ford and Bakken shale formations.

We intend to continue to leverage our relationship with TD and utilize the significant experience of our management team to execute our growth strategy of acquiring midstream assets from TD and third parties, increasing utilization of our existing assets and expanding our systems through construction of additional assets. Our reportable business segments are:

• Natural Gas Transportation & Logistics—the ownership and operation of FERC-regulated interstate natural gas pipelines and integrated natural gas storage facilities;

• Crude Oil Transportation & Logistics—the ownership and operation of a crude oil pipeline system; and

• Processing & Logistics—the ownership and operation of natural gas processing, treating and fractionation facilities, as well as water business services provided primarily to the oil and gas exploration and production industry.

Recent Developments

On April 14, 2015, the Board of Directors of our general partner declared a cash distribution for the quarter ended March 31, 2015 of $0.52 per common unit. The distribution will be paid on May 14, 2015, to unitholders of record on April 24, 2015. 

In April 2015, Pony Express placed in service the approximately 66-mile lateral in northeast Colorado commencing in Weld County, Colorado to interconnect with the existing Pony Express System just east of Sterling, Colorado.

U.S. Crude Oil and Natural Gas Supply and Demand Dynamics

Crude oil, natural gas and products derived from both continue to be critical components of energy supply and demand in the United States. Although crude oil and natural gas prices have declined in the latter part of 2014 and early 2015, we believe that the long-term prospects for continued crude oil and natural gas production increases are favorable and will be driven in part by increased domestic demand resulting from population and economic growth, higher industrial consumption in the U.S. and a desire to reduce domestic reliance on imports. We expect natural gas to continue to displace coal-fired electricity generation due to the low prices of natural gas and stricter environmental regulations on the mining and burning of coal. For additional information, please read Item 3.-Quantitative and Qualitative Disclosures About Market Risk.

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How We Evaluate Our Operations

We evaluate our results using, among other measures, contract profile and volumes, operating costs and expenses, Adjusted EBITDA and distributable cash flow. Adjusted EBITDA and distributable cash flow are non-GAAP measures and are defined below.

Contract Profile and Volumes

Our results are driven primarily by the volume of crude oil transportation capacity under firm contracts, the volume of natural gas transportation and storage capacity under firm contracts, the volume of natural gas that we process and the fees assessed for such services.

Operating Costs and Expenses

The primary components of our operating costs and expenses that we evaluate include cost of sales and transportation services, operations and maintenance and general and administrative costs. Our operating expenses are driven primarily by expenses related to the operation, maintenance and growth of our asset base.

Adjusted EBITDA and Distributable Cash Flow

Adjusted EBITDA and distributable cash flow are non-GAAP supplemental financial measures that management and external users of our consolidated financial statements, such as industry analysts, investors, lenders and rating agencies, may use to assess:

• our operating performance as compared to other publicly traded partnerships in the midstream energy industry, without regard to historical cost basis or, in the case of Adjusted EBITDA, financing methods;

• the ability of our assets to generate sufficient cash flow to make distributions to our unitholders;

• our ability to incur and service debt and fund capital expenditures; and

• the viability of acquisitions and other capital expenditure projects and the returns on investment of various expansion and growth opportunities.

We believe that the presentation of Adjusted EBITDA and distributable cash flow provides useful information to investors in assessing our financial condition and results of operations. Adjusted EBITDA and distributable cash flow should not be considered alternatives to net income, operating income, net cash provided by operating activities or any other measure of financial performance or liquidity presented in accordance with GAAP, nor should Adjusted EBITDA and distributable cash flow be considered alternatives to available cash, operating surplus, distributions of available cash from operating surplus or other definitions in our partnership agreement. Adjusted EBITDA and distributable cash flow have important limitations as analytical tools because they exclude some but not all items that affect net income and net cash provided by operating activities. Additionally, because Adjusted EBITDA and distributable cash flow may be defined differently by other companies in our industry, our definition of Adjusted EBITDA and distributable cash flow may not be comparable to similarly titled measures of other companies, thereby diminishing their utility.

Non-GAAP Financial Measures

We define Adjusted EBITDA as net income excluding the impact of interest, income taxes, depreciation and amortization, non-cash income or loss related to derivative instruments, non-cash long-term compensation expense, impairment losses, gains or losses on asset or business disposals or acquisitions, gains or losses on the repurchase, redemption or early retirement of debt, and earnings from unconsolidated investments, but including the impact of distributions from unconsolidated investments. We also use distributable cash flow, which we define as Adjusted EBITDA, plus preferred distributions received from Pony Express in excess of its distributable cash flow attributable to our net interest and adjusted for deficiency payments received from or utilized by Pony Express shippers, less cash interest expense, maintenance capital expenditures, and distributions to noncontrolling interests in excess of earnings allocated to noncontrolling interests, to analyze our performance. Maintenance capital expenditures are cash expenditures incurred (including expenditures for the construction or development of new capital assets) that we expect to maintain our long-term operating income or operating capacity. These expenditures typically include certain system integrity, compliance and safety improvements.

TEP receives a minimum quarterly preference payment from Pony Express of $36.65 million through the quarter ending December 31, 2015 (prorated to approximately $23.5 million for the quarter ended March 31, 2015). To the extent that Pony Express does not have sufficient distributable cash flow to cover this preference payment, TD, as the noncontrolling interest owner, is required to contribute cash to Pony Express to fund the excess preference payment. The cash received by Pony Express from TD to fund the minimum quarterly preference payment in excess of distributable cash flow from Pony Express is considered distributable cash flow at TEP. Pony Express collects deficiency payments for barrels committed by the customer to be transported in a month but not physically received for transport or delivered to the customers' agreed upon destination point. These deficiency payments are recorded as a deferred liability until the barrels are physically transported and delivered by TEP. As discussed further in Note 2 – Summary of Significant Accounting Policies, earnings at Pony Express are allocated between TEP and noncontrolling interests in accordance with a substantive profit sharing arrangement rather than pro rata by ownership. Distributions made by Pony Express to its noncontrolling interests reduce the distributable cash flow available to TEP.

Distributable cash flow and Adjusted EBITDA are not presentations made in accordance with GAAP. The following table presents a reconciliation of Adjusted EBITDA to net income and net cash provided by operating activities and a reconciliation of distributable cash flow to net cash provided by operating activities, the most directly comparable GAAP financial measures, for each of the periods indicated:

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Reconciliation of Adjusted EBITDA to Net Income
Net Income attributable to partners	$	32,319		$	17,124
Add:
Interest expense, net of noncontrolling interest	3,440			1,294
Depreciation and amortization expense, net of noncontrolling interest	20,533			7,804
Non-cash loss from asset sales	4,483			—
Non-cash (gain) loss related to derivative instruments	(90		)	351
Non-cash compensation expense	1,527			941
Distributions from unconsolidated investment	—			508
Less:
Non-cash loss allocated to noncontrolling interest	(9,377		)	—
Equity in earnings of unconsolidated investment	—			(444		)
Adjusted EBITDA	$	52,835		$	27,578
Reconciliation of Adjusted EBITDA and Distributable Cash Flow to Net Cash Provided by Operating Activities
Net cash provided by operating activities	$	48,639		$	27,603
Add:
Interest expense, net of noncontrolling interest	3,440			1,294
Other, including changes in operating working capital	756			(1,319		)
Adjusted EBITDA	$	52,835		$	27,578
Less:
Maintenance capital expenditures	(1,511		)	(941		)
Cash interest expense	(3,031		)	(1,173		)
Pony Express deficiency payments received, net	292			—
Distributions to noncontrolling interest	(2,103		)	—
Cash flow attributable to predecessor operations	—			(5,382		)
Distributable Cash Flow	$	46,482		$	20,082

The following table presents a reconciliation of Adjusted EBITDA by segment to segment operating income, the most directly comparable GAAP financial measure, for each of the periods indicated:

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Reconciliation of Adjusted EBITDA to Operating Income in the Natural Gas Transportation & Logistics Segment (1)
Operating income	$	12,553		$	12,966
Add:
Depreciation and amortization expense	6,071			5,605
Non-cash (gain) loss related to derivative instruments	(90		)	351
Other income, net	712			940
Segment Adjusted EBITDA	$	19,246		$	19,862
Reconciliation of Adjusted EBITDA to Operating Income in the Crude Oil Transportation & Logistics Segment (1)
Operating income (loss)	$	14,273		$	(757	)
Add:
Depreciation and amortization expense, net of noncontrolling interest	11,233			252
Adjusted EBITDA attributable to noncontrolling interests	—			505
Segment Adjusted EBITDA	$	25,506		$	—
Reconciliation of Adjusted EBITDA to Operating Income in the Processing & Logistics Segment (1)
Operating income	$	1,054		$	7,141
Add:
Depreciation and amortization expense, net of noncontrolling interest	3,229			1,947
Non-cash loss from asset sales	4,483			—
Distributions from unconsolidated investment	—			508
Adjusted EBITDA attributable to noncontrolling interests	(48		)	—
Segment Adjusted EBITDA	$	8,718		$	9,596
Total Segment Adjusted EBITDA	$	53,470		$	29,458
Public company costs	(635		)	(625		)
Elimination of intersegment activity	—			(1,255		)
Total Adjusted EBITDA	$	52,835		$	27,578

⁽¹⁾  Segment results as presented represent total operating income and Adjusted EBITDA, including intersegment activity, for the Natural Gas Transportation & Logistics, Crude Oil Transportation & Logistics, and Processing & Logistics segments. For reconciliations to the consolidated financial data, see Note 14 – Reporting Segments to the accompanying consolidated financial statements.

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Results of Operations

The following provides a summary of our consolidated results of operations for the periods indicated:

	Three Months Ended March 31,
	2015			2014
	(in thousands, except operating data)
Revenues:
Natural gas liquids sales	$	21,025		$	48,907
Natural gas sales	844			4,808
Natural gas transportation services	32,148			34,104
Crude oil transportation services	50,381			—
Processing and other revenues	10,277			6,960
Total Revenues	114,675			94,779
Operating Costs and Expenses:
Cost of sales	19,593			48,206
Cost of transportation services	10,715			5,117
Operations and maintenance	9,575			8,013
Depreciation and amortization	20,605			8,309
General and administrative	12,689			6,649
Taxes, other than income taxes	11,297			1,956
Loss on sale of assets	4,483			—
Total Operating Costs and Expenses	88,957			78,250
Operating Income	25,718			16,529
Other (Expense) Income:
Interest expense, net	(3,440		)	(1,296		)
Equity in earnings of unconsolidated investment	—			444
Other income, net	712			940
Total Other (Expense) Income	(2,728		)	88
Net Income	22,990			16,617
Net loss attributable to noncontrolling interests	9,329			507
Net income attributable to partners	32,319			17,124
Other Financial Data (1)
Adjusted EBITDA	$	52,835		$	27,578
Operating Data
Gas transportation firm contracted capacity (Mmcf/d)	1,609			1,604
Crude oil transportation average throughput (Bbls/d)	165			N/A
Natural gas processing inlet volumes (Mmcf/d)	145			151

⁽¹⁾  For more information regarding Adjusted EBITDA and a reconciliation of Adjusted EBITDA to its most directly comparable GAAP measure, please see "Non-GAAP Financial Measures" above.

Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

Revenues. Total revenues were $114.7 million for the three months ended March 31, 2015, compared to $94.8 million for the three months ended March 31, 2014, which represents an increase of $19.9 million, or 21%, in total revenues. The overall increase in revenue was largely driven by revenues of $50.4 million in the Crude Oil Transportation & Logistics segment for the three months ended March 31, 2015. There were no revenues in that segment for the three months ended March 31, 2014 as Pony Express had not yet commenced commercial operations. Revenue in the Processing & Logistics and Natural Gas Transportation & Logistics segments decreased$24.4 million, or 43%, and $6.0 million, or 15%, respectively.

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Operating costs and expenses. Operating costs and expenses were $89.0 million for the three months ended March 31, 2015 compared to $78.3 million for the three months ended March 31, 2014, which represents an increase of $10.7 million, or 14%. The increase in operating costs and expenses is primarily driven by an overall increase in operating costs and expenses of $35.4 million in the Crude Oil Transportation & Logistics segment reflecting the commencement of commercial operations at Pony Express. The increased costs in the Crude Oil Transportation & Logistics segment were partially offset by decreased costs of $18.3 million and $5.6 million in the Processing & Logistics and Gas Transportation & Logistics segments, respectively.

Interest expense, net. Interest expense of $3.4 million for the three months ended March 31, 2015 was primarily composed of interest and fees associated with TEP’s revolving credit facility, partially offset by interest income of $0.4 million on the cash balance swept to TD under the Pony Express cash management agreement. Interest expense of $1.3 million for the three months ended March 31, 2014 was primarily composed of interest and fees associated with TEP’s revolving credit facility. The increase in interest and fees associated with TEP's revolving credit facility is primarily due to higher average borrowings under the revolving credit facility during the three months ended March 31, 2015 over the three months ended March 31, 2014.

Equity in earnings of unconsolidated investment. Equity in earnings of unconsolidated investment of $0.4 million for the three months ended March 31, 2014 was related to our investment in GWSI prior to TEP's consolidation of the Water Solutions business on May 13, 2014.

Other income, net. Other income, net typically includes rental income, income earned from certain customers related to the capital costs we incurred to connect these customers to our system, the allowance for funds used during construction at our regulated entities, and other noncash gains and losses. Other income for the three months ended March 31, 2015 was $0.7 million compared to $0.9 million for the three months ended March 31, 2014.

Net loss attributable to noncontrolling interests. Net loss attributable to noncontrolling interests of $9.3 million for the three months ended March 31, 2015 primarily reflects losses allocated to the 33.3% noncontrolling interest of Pony Express as a result of the income allocated to TEP in line with the minimum quarterly preference payment received for the first quarter of 2015. Noncontrolling interest of $0.5 million for the three months ended March 31, 2014 primarily reflects the 66.7% noncontrolling interest of the amortization of use rights at Pony Express prior to commencement of commercial operations.

The following provides a summary of our Natural Gas Transportation & Logistics segment results of operations for the periods indicated:

Segment Financial Data - Natural Gas Transportation & Logistics (1)	Three Months Ended March 31,
	2015		2014
	(in thousands)
Revenues:
Natural gas sales	$	105	$	4,116
Natural gas transportation services	33,494		35,359
Processing and other revenues	11		156
Total revenues	33,610		39,631
Operating costs and expenses:
Cost of sales	74		3,827
Cost of transportation services	3,316		5,117
Operations and maintenance	5,740		6,049
Depreciation and amortization	6,071		5,605
General and administrative	4,261		4,192
Taxes, other than income taxes	1,595		1,875
Total operating costs and expenses	21,057		26,665
Operating income	$	12,553	$	12,966

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 14 – Reporting Segments to the accompanying consolidated financial statements.

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Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

Revenues. Natural Gas Transportation & Logistics segment revenues were $33.6 million for the three months ended March 31, 2015, compared to $39.6 million for the three months ended March 31, 2014, which represents a $6.0 million, or 15%, decrease in segment revenues primarily driven by a $4.0 million decrease in natural gas sales as a result of lower volumes sold and a 58% decrease in natural gas prices.

Operating costs and expenses. Operating costs and expenses in the Natural Gas Transportation & Logistics segment were $21.1 million for the three months ended March 31, 2015 compared to $26.7 million for the three months ended March 31, 2014, which represents a decrease of $5.6 million, or 21%.

Cost of sales decreased$3.8 million, or 98%, in the three months ended March 31, 2015 when compared to the same period in the prior year, due to lower natural gas sales volumes at TIGT and 50% lower natural gas prices.

Cost of transportation services decreased$1.8 million, or 35%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily due to decreased fuel reimbursements of $2.1 million, driven by lower transportation volumes, and decreased fuel recoveries of $1.8 million.

Operations and maintenance costs decreased$0.3 million, or 5%, in the three months ended March 31, 2015 when compared to the same period in the prior year.

Depreciation and amortization increased$0.5 million, or 8%, in the three months ended March 31, 2015 when compared to the same period in the prior year.

General and administrative costs increased$0.1 million, or 2%, in the three months ended March 31, 2015 when compared to the same period in the prior year.

Taxes, other than income taxes, decreased$0.3 million, or 15%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily due to lower property taxes as a result of successful appeals with state taxing authorities on the assessed value of property.

The following provides a summary of our Crude Oil Transportation & Logistics segment results of operations for the periods indicated:

Segment Financial Data - Crude Oil Transportation & Logistics (1)	Three Months Ended March 31,
	2015		2014
	(in thousands)
Revenues:
Crude Oil transportation services	$	50,381	$	—
Total revenues	50,381		—
Operating costs and expenses:
Cost of transportation services	8,709		—
Operations and maintenance	1,415		—
Depreciation and amortization	11,233		757
General and administrative	5,155		—
Taxes, other than income taxes	9,596		—
Total operating costs and expenses	36,108		757
Operating income (loss)	$	14,273	$	(757	)

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 14 – Reporting Segments to the accompanying consolidated financial statements.

Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

Revenues. Crude Oil Transportation & Logistics segment revenues of $50.4 million for the three months ended March 31, 2015 represents transportation revenue on Pony Express, which was placed in service in October 2014. There were no revenues for the three months ended March 31, 2014 as Pony Express had not yet commenced commercial operations.

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Operating costs and expenses. Operating costs and expenses in the Crude Oil Transportation & Logistics segment were $36.1 million for the three months ended March 31, 2015 compared to $0.8 million for the three months ended March 31, 2014. Operating costs and expenses for the three months ended March 31, 2015 include costs associated with the start of commercial operations in October 2014 as well as the amortization of the Pony Express oil conversion use rights. For the three months ended March 31, 2014, operating costs and expenses consisted of the amortization of the Pony Express oil conversion use rights.

The following provides a summary of our Processing & Logistics segment results of operations for the periods indicated:

Segment Financial Data - Processing & Logistics (1)	Three Months Ended March 31,
	2015		2014
	(in thousands)
Revenues:
Natural gas liquids sales	$	21,025	$	48,907
Natural gas sales	739		692
Processing and other revenues	10,266		6,804
Total revenues	32,030		56,403
Operating costs and expenses:
Cost of sales	19,519		44,379
Cost of transportation services	36		—
Operations and maintenance	2,420		1,964
Depreciation and amortization	3,301		1,947
General and administrative	1,111		891
Taxes, other than income taxes	106		81
Loss on sale of assets	4,483		—
Total operating costs and expenses	30,976		49,262
Operating income	$	1,054	$	7,141

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 14 – Reporting Segments to the accompanying consolidated financial statements.

Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

Revenues. Processing & Logistics segment revenues were $32.0 million for the three months ended March 31, 2015, compared to $56.4 million for the three months ended March 31, 2014, which represents a $24.4 million, or 43%, decrease in segment revenues. The decrease in segment revenues was primarily due to a $27.9 million decrease in natural gas liquids sales at TMID, partially offset by a $3.0 million increase in processing and other revenues at Water Solutions. The decrease in natural gas liquids sales at TMID was driven by reduced volumes processed and a 67% decrease in NGL prices. The Water Solutions business was consolidated in May 2014 and recognized processing and other revenues of $3.0 million during the three months ended March 31, 2015. Prior to its consolidation in May 2014, TEP's investment in Water Solutions was accounted for under the equity method of accounting and as a result TEP recognized no revenues from Water Solutions during the three months ended March 31, 2014.

Operating costs and expenses. Operating costs and expenses in the Processing & Logistics segment were $31.0 million for the three months ended March 31, 2015 compared to $49.3 million for the three months ended March 31, 2014, which represents a decrease of $18.3 million, or 37%.

Cost of sales decreased$24.9 million, or 56%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily driven by decreased volumes processed and lower NGL prices as discussed above.

Cost of transportation services of $36,000 in the three months ended March 31, 2015 represent the costs of water transportation at the Water Solutions business, which was consolidated in May 2014.

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Operations and maintenance costs increased$0.5 million, or 23%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily driven by operations and maintenance costs at Water Solutions of $0.4 million during the three months ended March 31, 2015. Prior to its consolidation in May 2014, TEP's investment in Water Solutions was accounted for under the equity method of accounting and as a result TEP recognized no operations and maintenance costs during the three months ended March 31, 2014.

Depreciation and amortization increased$1.4 million, or 70%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily driven by depreciation and amortization at Water Solutions of $1.3 million during the three months ended March 31, 2015. Prior to its consolidation in May 2014, TEP's investment in Water Solutions was accounted for under the equity method of accounting and as a result TEP recognized no depreciation and amortization during the three months ended March 31, 2014.

General and administrative costs increased$0.2 million, or 25%, in the three months ended March 31, 2015 when compared to the same period in the prior year, primarily driven by the consolidation of Water Solutions in May 2014.

Taxes, other than income taxes, were comparable during the three months ended March 31, 2015 and the three months ended March 31, 2014.

Loss on sale of assets during the three months ended March 31, 2015 represents a noncash loss recognized on the sale of compressor assets at TMID during the three months ended March 31, 2015.

Liquidity and Capital Resources Overview

Our primary sources of liquidity for the three months ended March 31, 2015 were proceeds from the issuance of common units, borrowings under our revolving credit facility, and cash generated from operations. We expect our sources of liquidity in the future to include:

• cash generated from our operations;

• borrowing capacity available under our revolving credit facility; and

• future issuances of additional partnership units and/or debt securities.

We believe that cash on hand, cash generated from operations and availability under our revolving credit facility will be adequate to meet our operating needs, our planned short-term capital and debt service requirements and our planned cash distributions to unitholders. We believe that future internal growth projects or potential acquisitions will be funded primarily through a combination of borrowings under our revolving credit facility and issuances of debt and/or equity securities.

Our total liquidity as of March 31, 2015 and December 31, 2014 was as follows:

	March 31, 2015			December 31, 2014
	(in thousands)
Cash on hand	$	876		$	867
Total capacity under the revolving credit facility	850,000			850,000
Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
Less: Letters of credit issued under the revolving credit facility	—			—
Available capacity under the revolving credit facility	152,000			291,000
Total liquidity	$	152,876		$	291,867

Revolving Credit Facility

The revolving credit facility contains various covenants and restrictive provisions that, among other things, limit or restrict TEP’s ability (as well as the ability of TEP’s restricted subsidiaries) to incur or guarantee additional debt, incur certain liens on assets, dispose of assets, make certain distributions (including distributions from available cash, if a default or event of default under the credit agreement then exists or would result from making such a distribution), change the nature of TEP’s business, engage in certain mergers or make certain investments and acquisitions, enter into non-arms-length transactions with affiliates and designate certain subsidiaries as "Unrestricted Subsidiaries." In addition, TEP is required to maintain a consolidated leverage ratio of not more than 4.75 to 1.00 (which will be increased to 5.25 to 1.00 for certain measurement periods following the consummation of certain acquisitions) and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2015, TEP is in compliance with the covenants required under the revolving credit facility.

The unused portion of the revolving credit facility is subject to a commitment fee, which ranges from 0.300% to 0.500%, based on TEP’s total leverage ratio. As of March 31, 2015, the weighted average interest rate on outstanding borrowings was 2.20%.

February Public Offering

On February 27, 2015, TEP sold 10,000,000 common units representing limited partner interests in an underwritten public offering at a price of $50.82 per unit, or $49.29 per unit net of the underwriter's discount, for net proceeds of approximately $492.6 million after deducting the underwriter's discount and offering expenses paid by TEP. TEP used the net proceeds from the offering to fund a portion of the consideration for the acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions. Pursuant to the underwriters' option to purchase additional units, TEP sold an additional 1,200,000 common units representing limited partner interests to the underwriters at a price of $50.82 per unit, or $49.29 per unit net of the underwriter’s discount, for net proceeds of approximately $59.3 million after deducting the underwriter’s discount and offering expenses paid by TEP. TEP used the net proceeds from this additional purchase of common units to reduce borrowings under its revolving credit facility, a portion of which were used to fund the March 2015 acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions.

Working Capital

Working capital is the amount by which current assets exceed current liabilities. Our working capital requirements have been, and we expect will continue to be, primarily driven by changes in accounts receivable and accounts payable. Factors impacting changes in accounts receivable and accounts payable could include the timing of collections from customers, payments to suppliers, and receivables from related parties, as well as the level of spending for capital expenditures and changes in the market prices of energy commodities that we buy and sell in the normal course of business.

As of March 31, 2015, we had a working capital deficit of $40.8 million compared to a working capital surplus of $35.7 million at December 31, 2014, which represents a decrease in working capital of $76.5 million. The overall decrease in working capital was primarily attributable to a decrease of $73.4 million in receivables from related parties due to the utilization of the Pony Express cash balance swept to TD under the cash management agreement.

A material adverse change in operations, available financing under our revolving credit facility, or available financing from the equity or debt capital markets could impact our ability to fund our requirements for liquidity and capital resources in the future.

Cash Flows

The following table and discussion presents a summary of our cash flow for the periods indicated:

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Net cash provided by (used in):
Operating activities	$	48,639		$	27,603
Investing activities	$	(713,611	)	$	(211,021	)
Financing activities	$	664,981		$	183,418

Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

Operating Activities. Cash flows provided by operating activities were $48.6 million and $27.6 million for the three months ended March 31, 2015 and 2014, respectively. The increase in net cash flows provided by operating activities of $21.0 million was primarily driven by increased operating results during the period, largely driven by the start of commercial operations at Pony Express in October 2014, as well as higher cash inflows as a result of changes in working capital balances, primarily driven by an increase in accounts payable and accrued liabilities due to property tax accruals in the Crude Oil Transportation & Logistics segment during the three months ended March 31, 2015.

Investing Activities. Cash flows used in investing activities were $713.6 million and $211.0 million for the three months ended March 31, 2015 and 2014, respectively. During the three months ended March 31, 2015, net cash used in investing activities were driven by the $700 million cash outflow for the acquisition of an additional 33.3% membership interest in Pony Express and capital expenditures of $13.3 million, primarily due to construction of the Pony Express System, including the lateral in Northeast Colorado. In the three months ended March 31, 2014, net cash used in investing activities was driven by $209.1 million in capital expenditures, consisting primarily of spending on the conversion and construction of the Pony Express System.

30

Financing Activities. Cash flows provided by financing activities were $665.0 million and $183.4 million for the three months ended March 31, 2015 and 2014, respectively. Financing cash inflows for the three months ended March 31, 2015 were primarily driven by $551.9 million and $139.0 million, respectively, from the issuance of 11.2 million common units in a public offering during the three months ended March 31, 2015 and net borrowings under the revolving credit facility, the proceeds of which were used to fund the acquisition of an additional 33.3% membership interest in Pony Express as discussed above. These financing cash inflows were partially offset by distributions to unitholders of $28.3 million. Cash flows provided by financing activities for the three months ended March 31, 2014 consisted primarily of net contributions from Predecessor Members of $195.3 million. These financing cash inflows were partially offset by distributions to unitholders of $13.1 million.

Distributions

We intend to pay quarterly distributions at or above the amount of the MQD, which is $0.2875 per unit. As of May 11, 2015, we had a total of 61,068,496 common and general partner units outstanding, which equates to an aggregate MQD of approximately $17.6 million per quarter and approximately $70.2 million per year. We do not have a legal obligation to pay distributions except as provided in our partnership agreement. A distribution of $0.52 per unit for the three months ended March 31, 2015 was declared on April 14, 2015 and will be paid on May 14, 2015 to unitholders of record on April 24, 2015.

Capital Requirements

The midstream energy business can be capital-intensive, requiring significant investment to maintain and upgrade existing operations. Our capital requirements have consisted primarily of, and we anticipate will continue to consist of the following:

• maintenance capital expenditures, which are cash expenditures incurred (including expenditures for the construction or development of new capital assets) that we expect to maintain our long-term operating income or operating capacity. These expenditures typically include certain system integrity, compliance and safety improvements; and

• expansion capital expenditures, which are cash expenditures to increase our operating income or operating capacity over the long term. Expansion capital expenditures include acquisitions or capital improvements (such as additions to or improvements on the capital assets owned, or acquisition or construction of new capital assets).

We expect to incur approximately $199 million for capital expenditures in 2015, of which approximately $149 million is expected for the construction of the lateral to the Pony Express System located in Northeast Colorado and remaining costs associated with completion of the construction of the Pony Express System, approximately $37 million is expected for other expansion projects, and approximately $13 million is expected for maintenance capital expenditures.

The determination of capital expenditures as maintenance or expansion is made at the individual asset level during our budgeting process and as we approve, execute, and monitor our capital spending. The following table summarizes the maintenance and expansion capital expenditures incurred at our consolidated entities:

	Three Months Ended March 31,
	2015		2014
	(in thousands)
Maintenance capital expenditures	$	1,511	$	941
Expansion capital expenditures	80,996		261,711
Total capital expenditures incurred	$	82,507	$	262,652

Capital expenditures incurred represent capital expenditures paid and accrued during the period, inclusive of Pony Express capital expenditures paid by TD on behalf of Pony Express and settled via the cash management agreement. The increase in maintenance capital expenditures to $1.5 million for the three months ended March 31, 2015 from $0.9 million for the three months ended March 31, 2014 is primarily driven by increased maintenance capital expenditures in the Gas Transportation & Storage segment. Maintenance capital expenditures on our assets occur on a regular schedule, but most major maintenance projects are not required every year so the level of maintenance capital expenditures naturally varies from year to year and from quarter to quarter. The decrease in expansion capital expenditures to $81.0 million for the three months ended March 31, 2015 from $261.7 million for the three months ended March 31, 2014 is primarily driven by the significant spending on the Pony Express System prior to commencement of commercial operations in October 2014. Expansion capital expenditures of $81.0 million for the three months ended March 31, 2015 consisted primarily of spending on the Pony Express System lateral in Northeast Colorado.

In addition, we invested cash in unconsolidated affiliates of $1.8 million during the three months ended March 31, 2014 to fund our share of capital expansion projects. There were no investments in unconsolidated affiliates during the three months ended March 31, 2015.

31

We intend to make cash distributions to our unitholders and our general partner. Due to our cash distribution policy, we expect that we will distribute to our unitholders most of the cash generated by our operations. We expect to fund future capital expenditures with funds generated from our operations, borrowings under our Credit Agreement, the issuance of additional partnership units and/or the issuance of long-term debt. If these sources are not sufficient, we may reduce our discretionary spending.

Contractual Obligations

There have been no material changes in our contractual obligations as reported in our 2014 Form 10-K.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements.

Critical Accounting Policies and Estimates

The critical accounting policies and estimates used in the preparation of our condensed consolidated financial statements are set forth in our 2014 Form 10-K for the year ended December 31, 2014 and have not changed.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Commodity Price Risk

The profitability of our processing contracts that include keep whole or percent of proceeds components is affected by volatility in prevailing NGL and natural gas prices. As of March 31, 2015 approximately 87% of our reserved processing capacity was subject to fee-based processing contracts, with the remaining 13% subject to percent of proceeds or keep whole processing contracts. We do not currently hedge the commodity exposure in our processing contracts and we do not expect to in the foreseeable future. Our Processing & Logistics segment comprised approximately 17% and 35% of our Adjusted EBITDA for the three months ended March 31, 2015 and 2014, respectively.

We have a limited amount of direct commodity price exposure related to crude oil collected as part of our contractual pipeline loss allowance at Pony Express. We do not currently hedge this commodity exposure.

We also have a limited amount of direct commodity price exposure related to natural gas collected related to electrical compression costs and lost and unaccounted for gas on the TIGT System. Historically, we have entered into derivative contracts with third parties for a substantial majority of the gas we expect to collect during the current year for the purpose of hedging our commodity price exposures. We expect to continue these hedging activities for the foreseeable future. As of March 31, 2015, we had natural gas swaps outstanding with a notional volume of approximately 0.9 Bcf short, representing a portion of the natural gas that is expected to be sold by our Natural Gas Transportation and Logistics segment through the end of 2015. The fair value of these swaps was an asset of approximately $0.1 million at March 31, 2015.

We measure the risk of price changes in our natural gas swaps utilizing a sensitivity analysis model. The sensitivity analysis measures the potential income or loss (i.e., the change in fair value of the derivative instruments) based upon a hypothetical 10% movement in the underlying quoted market prices. In addition to these variables, the fair value of each portfolio is influenced by fluctuations in the notional amounts of the instruments and the discount rates used to determine the present values. We enter into derivative contracts solely for the purpose of mitigating the risks that accompany certain of our business activities and, therefore, both the sensitivity analysis model and the change in the market value of our outstanding derivative contracts are offset largely by changes in the value of the underlying physical natural gas sales. A hypothetical 10% increase in the natural gas price forward curve would result in a decrease of approximately $0.2 million in the net fair value of our derivative instruments for the quarter ended March 31, 2015 as a result of our hedging program. For the purpose of determining the change in fair value associated with the hypothetical natural gas price increase scenario, we have assumed a parallel shift in the forward curve through the end of 2015.

The Commodity Futures Trading Commission ("CFTC") has promulgated regulations to implement Dodd-Frank’s changes to the Commodity Exchange Act, including the definition of commodity-based swaps subject to those regulations. The CFTC regulations are intended to implement new reporting and record keeping requirements related to those swap transactions and a mandatory clearing and exchange-execution regime for various types, categories or classes of swaps, subject to certain exemptions, including the trade-option and end-user exemptions. Although we anticipate that most, if not all, of our swap transactions should qualify for an exemption to the clearing and exchange-execution requirements, we will still be subject to record keeping and reporting requirements. Other changes to the Commodity Exchange Act made as a result of the Dodd-Frank Act and the CFTC’s implementing regulations could significantly increase the cost of entering into new swaps.

32

Interest Rate Risk

As described in "Liquidity and Capital Resources Overview" above, we currently have an $850 million revolving credit facility. Borrowings under the revolving credit facility will bear interest, at our option, at either (a) a base rate, which will be a rate equal to the greatest of (i) the prime rate, (ii) the U.S. federal funds rate plus 0.5% and (iii) a one-month reserve adjusted Eurodollar rate plus 1.00% or (b) a reserve adjusted Eurodollar Rate, plus, in each case, an applicable margin. For loans bearing interest based on the base rate, the applicable margin was initially 1.00%, and for loans bearing interest based on the reserve adjusted Eurodollar rate, the applicable margin was initially 2.00%. After June 25, 2014, the applicable margin ranges from 0.75% to 2.75%, based upon our total leverage ratio and whether we have elected the base rate or the reserve adjusted Eurodollar rate. We do not currently hedge the interest rate risk on our borrowings under the credit facility. However, in the future we may consider hedging the interest rate risk or may consider choosing longer Eurodollar borrowing terms in order to fix all or a portion of our borrowings for a period of time. We estimate that a 1% increase in interest rates would decrease the fair value of the debt by $0.1 million based on the debt obligations as of March 31, 2015.

Credit Risk

We are exposed to credit risk. Credit risk represents the loss that we would incur if a counterparty fails to perform under its contractual obligations. We manage our exposure to credit risk associated with customers to whom we extend credit through a credit approval process which includes credit analysis, the establishment of credit limits and ongoing monitoring procedures. We may request letters of credit, cash collateral, prepayments, guarantees or bonds as forms of credit support. We have historically experienced only minimal credit losses in connection with our receivables.

A substantial majority of our revenue is produced under long-term, firm, fee-based contracts with high-quality customers. The customer base we currently serve under these contracts generally has a strong credit profile, with approximately 70% of our revenues derived from customers who have investment grade credit ratings or are part of corporate families with investment grade credit ratings as of March 31, 2015.

33

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a- 15(e) or Rule 15d- 15(e) under the Securities Exchange Act of 1934) as of the end of the period covered by this report, and has concluded that our disclosure controls and procedures are effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported, within the time periods specified in the Securities and Exchange Commission’s rules and forms including, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934 is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosures.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended March 31, 2015 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

See Note 13 – Legal and Environmental Matters to the consolidated financial statements included in Part I—Item 1.—Financial Statements of this Quarterly Report, which is incorporated here by reference.

Item 1A. Risk Factors

Item 1A of our 2014 Form 10-K for the year ended December 31, 2014 sets forth information relating to important risks and uncertainties that could materially adversely affect our business, financial condition or operating results. Those risk factors continue to be relevant to an understanding of our business, financial condition and operating results for the quarter ended March 31, 2015. There have been no material changes to the risk factors contained in our 2014 Form 10-K for the year ended December 31, 2014.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

34

Item 6. Exhibits

Exhibit No.	Description
10.1	Purchase and Sale Agreement, dated as of March 1, 2015, by and among Tallgrass Energy Partners, LP, Tallgrass Development, LP and Tallgrass Operations, LLC (incorporated by reference to Exhibit 10.1 to the Partnership’s Current Report on Form 8-K filed on March 2, 2015).
10.2	Third Amended and Restated Limited Liability Company Agreement of Tallgrass Pony Express Pipeline, LLC, dated as of March 1, 2015, by and among Tallgrass Pony Express Pipeline, LLC, Tallgrass Operations, LLC, and Tallgrass PXP Holdings, LLC (incorporated by reference to Exhibit 10.2 to the Partnership’s Current Report on Form 8-K filed on March 2, 2015).
31.1*	Rule 13a-14(a)/15d-14(a) Certification of David G. Dehaemers, Jr.
31.2*	Rule 13a-14(a)/15d-14(a) Certification of Gary J. Brauchle.
32.1*	Section 1350 Certification of David G. Dehaemers, Jr.
32.2*	Section 1350 Certification of Gary J. Brauchle.
101.INS*	XBRL Instance Document.
101.SCH*	XBRL Taxonomy Extension Schema Document.
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document.

* - filed herewith

35

SIGNATURES

Pursuant to the requirements 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.

		Tallgrass Energy Partners, LP
		(registrant)
		By:	Tallgrass MLP GP, LLC, its general partner
Date:	May 11, 2015	By:	/s/ Gary J. Brauchle
			Name:	Gary J. Brauchle
			Title:	Executive Vice President and Chief Financial Officer

36

EX-31.1

Exhibit 31.1

Certification by Chief Executive Officer pursuant to

Rule 13a-14(a) or Rule 15d-14(a) under the Securities Exchange Act of 1934,

as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, David G. Dehaemers, Jr., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Tallgrass Energy Partners, LP;

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 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)) 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) 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

c) 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.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (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.

By:	/s/ David G. Dehaemers, Jr.
	David G. Dehaemers, Jr.
	President and Chief Executive Officer of Tallgrass MLP GP, LLC (the general partner of Tallgrass Energy Partners, LP)

Date: May 11, 2015

EX-31.2

Exhibit 31.2

Certification by Chief Executive Officer pursuant to

Rule 13a-14(a) or Rule 15d-14(a) under the Securities Exchange Act of 1934,

as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Gary J. Brauchle, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Tallgrass Energy Partners, LP;

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 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)) 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) 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

c) 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.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (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.

By:	/s/ Gary J. Brauchle
	Gary J. Brauchle
	Executive Vice President and Chief Financial Officer of Tallgrass MLP GP, LLC (the general partner of Tallgrass Energy Partners, LP)

Date: May 11, 2015

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 quarterly report of Tallgrass Energy Partners, LP (the “Partnership”) on Form 10-Q for the quarter ended March 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David G. Dehaemers, Jr., President and Chief Executive Officer of Tallgrass MLP GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (“Section 906”), that, to my knowledge:

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 Partnership.

By:	/s/ David G. Dehaemers, Jr.
	David G. Dehaemers, Jr.
	President and Chief Executive Officer of Tallgrass MLP GP, LLC (the general partner of Tallgrass Energy Partners, LP)

Date: May 11, 2015

A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification Pursuant to

18 U.S.C. Section 1350,

as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the quarterly report of Tallgrass Energy Partners, LP (the “Partnership”) on Form 10-Q for the quarter ended March 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gary J. Brauchle, Vice President and Chief Financial Officer of Tallgrass MLP GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (“Section 906”), that, to my knowledge:

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 Partnership.

By:	/s/Gary J. Brauchle
	Gary J. Brauchle
	Executive Vice President and Chief Financial Officer of Tallgrass MLP GP, LLC (the general partner of Tallgrass Energy Partners, LP)

Date: May 11, 2015

A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Related Party Transaction [Line Items]
Interest Income, Related Party	$ 400,000
TEP
Related Party Transaction [Line Items]
Expected general administrative expense reimbursement	5,400,000
Pony Express Pipeline
Related Party Transaction [Line Items]
Expected general administrative expense reimbursement	5,200,000
Public Company Expense [Member]
Related Party Transaction [Line Items]
Expected public company cost reimbursement	$ 635,000

XML

Net Income per Limited Partner Unit - Summary of Net Income Per Limited Partner Unit (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 22,990	$ 16,617
Net Income (Loss) Attributable to Noncontrolling Interest	9,329	507
Net income (loss)	32,319	17,124
Predecessor operations interest in net income	0	(4,224)
General partner interest in net (income) loss	(7,438)	(382)
General partner interest in net income	$ 24,881	$ 12,518
Basic average number of common and subordinated units outstanding	$ 0.47	$ 0.31
Diluted average number of common and subordinated units outstanding	$ 0.46	$ 0.30
Basic average number of common and subordinated units outstanding	52,727	40,500
Basic average number of common and subordinated units outstanding	1,267	772
Diluted average number of common and subordinated units outstanding	53,994	41,272

XML

Risk Management - Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$ 90,000	$ 0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	90,000
Derivative assets at fair value	90,000	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	90,000
Commodity Contract [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	0
Commodity Contract [Member] | Significant other observable inputs (Level 2) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	90,000
Commodity Contract [Member] | Significant unobservable inputs (Level 3) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	$ 0

XML

Regulatory Matters Regulatory Details (Details) (USD $)	0 Months Ended	2 Months Ended	3 Months Ended	10 Months Ended
	Jul. 01, 2013	Dec. 31, 2012	Mar. 31, 2014	Nov. 12, 2012	Aug. 06, 2012 mi
Tallgrass Interstate Gas Transmission, LLC (TIGT) [Member]
Entity Information [Line Items]
Gas transmission lines owned					433
Trailblazer
Entity Information [Line Items]
Cost of Service used by FERC	$ 25,700,000
Rate of Return	10.94%
Unrecovered Fuel Costs		$ 578,000	$ 8,400,000	$ 6,000,000

XML

Risk Management - Derivative Contracts Included in Consolidated Statement of Income (Detail) (Derivatives not designated as hedging contracts [Member], Energy commodity derivative contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivatives not designated as hedging contracts [Member] | Energy commodity derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ 90	$ (351)

XML

Description of Business - Additional Information (Detail)	3 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Feb. 17, 2015
Organization [Line Items]
General partner units issued	834,391		834,391
General partner interest in TEP	1.40%
Ownership Interests Held By Public [Member]
Organization [Line Items]
Unitholders units outstanding (in shares)	33,878,625
Common Unitholder Percentage Ownership	56.20%
Aggregate outstanding common, subordinated and general partner units	55.50%
Ownership Interests Held By TD
Organization [Line Items]
Unitholders units outstanding (in shares)	26,355,480
Common Unitholder Percentage Ownership	43.80%
Aggregate outstanding common, subordinated and general partner units	43.20%
Limited Partners Subordinated Units Converted					16,200,000
Pony Express Pipeline
Organization [Line Items]
Variable Interest Entity, Ownership Percentage		33.30%	33.30%
Pony Express Pipeline
Organization [Line Items]
Variable Interest Entity, Ownership Percentage	66.70%	33.30%		33.30%

XML

Reporting Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Segment
Segment Reporting [Abstract]
Number of reportable segments	3

XML

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2015

Related Party Transactions [Abstract]

Schedule of Transactions with Affiliated Companies

Totals of transactions with affiliated companies are as follows:

	Three Months Ended March 31,
	2015		2014
	(in thousands)
Charges to TEP: (1)
Property, plant and equipment, net	$	1,307	$	3,400
Operation and maintenance	$	5,423	$	4,348
General and administrative	$	9,256	$	4,927

⁽¹⁾  Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.

Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets

Details of balances with affiliates included in "Receivable from related party" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Receivable from related party:
Tallgrass Operations, LLC	$	—	$	73,393
Total receivable from related party	$	—	$	73,393
Accounts payable to related parties:
Tallgrass Operations, LLC	$	2,980	$	3,894
Rockies Express Pipeline LLC	11		21
Deeprock Development, LLC	9		—
Total accounts payable to related parties	$	3,000	$	3,915

Schedule of Balances of Gas Imbalance with Affiliated Shippers

Balances of gas imbalances with affiliated shippers are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Affiliate gas balance receivables	$	168	$	275
Affiliate gas balance payables	$	410	$	455

XML

Long-term Debt Capacity under Revolving Credit Facility (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ (698,000)	$ (559,000)
Senior Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	(698,000)	(559,000)
Line of Credit Facility, Remaining Borrowing Capacity	152,000	291,000
Barclays Bank [Member] | Senior Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 850,000	$ 850,000

XML

Related Party Transactions - Schedule of Balances of Gas Imbalance with Affiliated Shippers (Detail) (Affiliated Shippers [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Affiliated Shippers [Member]
Related Party Transaction [Line Items]
Affiliate gas balance receivables	$ 168	$ 275
Affiliate gas balance payables	$ 410	$ 455

XML

Acquisitions (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	May 13, 2014	Apr. 01, 2014	Mar. 01, 2015	Sep. 01, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
General partner units issued	834,391						834,391
Cash Contributed to TD	$ 700,000,000	$ 0
Equity interest acquired			80.00%
Business Acquisition, Pro Forma Revenue		96,700,000
Business Acquisition, Pro Forma Net Income (Loss)		17,400,000
Water Solutions [Member]
Business Acquisition [Line Items]
Equity interest acquired			80.00%
Acquisition of Water Solutions			7,600,000
Equity interest held by noncontrolling interests			20.00%
Acquisition, noncontrolling interest, fair value			1,400,000
Trailblazer
Business Acquisition [Line Items]
Date of acquisition				Apr. 01, 2014
Total consideration				164,000,000
Acquisitions				150,000,000
Common and subordinated units issued, units				385,140
Common unit, issuance value				14,000,000
General partner units issued				7,860
General Partners capital account partnership interest percentage				2.00%
Pony Express Pipeline
Business Acquisition [Line Items]
Date of acquisition					Mar. 01, 2015	Sep. 01, 2014
Total consideration						600,000,000
Acquisitions	324,328,000					(3,000,000)
Common and subordinated units issued, units						70,340
Variable Interest Entity, Ownership Percentage	66.70%				33.30%	33.30%
Total Consideration Transferred Directly to TD						30,000,000
Cash Contributed to TD					700,000,000	27,000,000
Percentage of Membership Interest before Effect of New Membership						1.9585%
Preferred Membership, Percentage Acquired					33.30%	100.00%
Cash Contributed to Pony						570,000,000
Cash contributed to TD as part of Pony acquisition						300,000,000
Funds Maintained by Pony to Fund Remaining Construction						270,000,000
Minimum Quarterly Distribution Required by Partnership Agreement					36,650,000	16,650,000
Minimum Monthly Distribution Required by Partnership Agreement					23,500,000	5,400,000
Grasslands Water Services I, LLC [Member]
Business Acquisition [Line Items]
Equity interest ownership percentage							50.00%
Equity interest transferred as part of acquisition			50.00%
Acquisition fair value			11,900,000
Gain on remeasurement of unconsolidated investment			9,400,000
General Partner
Business Acquisition [Line Items]
General Partners' contributed capital				263,000
General Partner | Pony Express Pipeline
Business Acquisition [Line Items]
Acquisitions	$ 324,328,000
Grasslands Water Services I, LLC [Member] | BNN Energy LLC [Member]
Business Acquisition [Line Items]
Equity interest transferred as part of acquisition			50.00%
Alpha Reclaim Technology, LLC [Member] | BNN Energy LLC [Member]
Business Acquisition [Line Items]
Equity interest transferred as part of acquisition			100.00%

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Partnership Equity and Distributions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended						0 Months Ended	12 Months Ended	0 Months Ended
	Mar. 30, 2015	Feb. 27, 2015	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Feb. 17, 2015
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Distribution Date			May 14, 2015	[1]	Feb. 13, 2015	Nov. 14, 2014	Aug. 14, 2014	May 14, 2014
Initial public offering of common units	1,200,000	10,000,000
Shares Issued, Price Per Share		$ 50.82
Shares Issued, Price Per Share, Net of Underwriters Discount		$ 49.29
Proceeds from public offerings, net of offering costs	$ 59,300	$ 492,600	$ 551,949					$ 0
Distributions per Limited Partner unit			$ 0.5200		$ 0.4850	$ 0.4100	$ 0.3800	$ 0.3250
General partner interest in TEP			1.40%
General partner units issued			834,391		834,391					834,391
Pony Express Pipeline
Limited Partners' Capital Account [Line Items]
Variable Interest Entity, Ownership Percentage									33.30%	33.30%
Ownership Interests Held By TD
Limited Partners' Capital Account [Line Items]
Limited Partners Subordinated Units Converted												16,200,000
Common Units, Conversion Ratio			1
Minimum Quarterly Distribution [Member]
Limited Partners' Capital Account [Line Items]
Distributions per Limited Partner unit			$ 0.2875
Second Target Distribution [Member]
Limited Partners' Capital Account [Line Items]
Increasing incentive distribution right			13.00%
Incentive distribution per unit			$ 0.3536
Percentage of unit holders			85.00%
Percentage of general partner			15.00%
Third Target Distribution [Member]
Limited Partners' Capital Account [Line Items]
Increasing incentive distribution right			23.00%
Incentive distribution per unit			$ 0.4313
Percentage of unit holders			75.00%
Percentage of general partner			25.00%
First Target Distribution [Member]
Limited Partners' Capital Account [Line Items]
General partner interest in TEP			2.00%
Incentive distribution per unit			$ 0.3048
Percentage of unit holders			98.00%
Percentage of general partner			2.00%
Thereafter [Member]
Limited Partners' Capital Account [Line Items]
Increasing incentive distribution right			48.00%
Pony Express Pipeline
Limited Partners' Capital Account [Line Items]
Variable Interest Entity, Ownership Percentage			66.70%						33.30%		33.30%
Thereafter [Member]
Limited Partners' Capital Account [Line Items]
Percentage of unit holders			50.00%
Percentage of general partner			50.00%

[1] (1) The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

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Subsequent Events Subsequent Events (Details) (USD $)	0 Months Ended
	Mar. 30, 2015	Feb. 27, 2015	May 12, 2015
Subsequent Event [Line Items]
Initial public offering of common units (in units)	1,200,000	10,000,000
Unit price ($ per share)		$ 50.82
Scenario, Forecast | Limited Partner | TEGP | Subsequent Event
Subsequent Event [Line Items]
Unitholders units outstanding (in units)			20,000,000
Scenario, Forecast | Limited Partner | Capital Unit, Class A | TEGP | Subsequent Event
Subsequent Event [Line Items]
Initial public offering of common units (in units)			41,500,000
Unit price ($ per share)			$ 29.00
Over-Allotment Option | Scenario, Forecast | Limited Partner | Capital Unit, Class A | TEGP | Subsequent Event
Subsequent Event [Line Items]
Initial public offering of common units (in units)			6,225,000

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Risk Management Derivative Instruments Maximum Potential Exposure To Credit Loss (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Credit Derivative Netting Agreement Impact	$ 0
Cash Collateral for Borrowed Securities	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	$ 90

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Variable Interest Entity (Notes)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entity Disclosure [Text Block]

TEP does not have the obligation to absorb losses from Pony Express during the preference period as a result of the minimum quarterly preference payments as discussed in Note 4 – Acquisitions. In addition, for the period from the acquisition of the initial 33.3% membership interest effective September 1, 2014 to the acquisition of an additional 33.3% membership interest effective March 1, 2015, TEP, as the managing member of Pony Express, had voting rights disproportionate to its ownership interest. As a result, TEP has determined that Pony Express is a VIE of which TEP is the primary beneficiary and consolidates Pony Express accordingly.

TEP has not provided any additional financial support to Pony Express other than its initial capital contribution of $570 million and has no contractual commitments or obligations to provide additional financial support. In the event that the costs of construction of the Pony Express System and lateral in Northeast Colorado exceed the $270 million retained by Pony Express as discussed in Note 4 – Acquisitions, TD is obligated to fund the remaining costs.

The carrying amounts and classifications of the Pony Express assets and liabilities included in TEP's condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Current assets	$	27,315	$	93,019
Noncurrent assets	1,362,803		1,300,816
Total assets	$	1,390,118	$	1,393,835
Current liabilities	$	57,336	$	52,547
Total liabilities	$	57,336	$	52,547

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Inventory Inventory (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Energy Related Inventory, Natural Gas in Storage	$ 6,055	$ 8,896
Inventory, Raw Materials and Supplies, Gross	4,600	3,049
Energy Related Inventory, Crude Oil, Products and Merchandise	1,592	581
Energy Related Inventory, Natural Gas Liquids	432	519
Inventory, Net	$ 12,679	$ 13,045

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Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities

The following table sets forth the outstanding borrowings, letters of credit issued, and available borrowing capacity under TEP's revolving credit facility as of March 31, 2015 and December 31, 2014:

	March 31, 2015			December 31, 2014
	(in thousands)
Total capacity under the revolving credit facility	$	850,000		$	850,000
Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
Available capacity under the revolving credit facility	$	152,000		$	291,000

Carrying Amount and Fair value of TEP's Long-term Debt

The following table sets forth the carrying amount and fair value of TEP’s long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, but for which fair value is disclosed:

	Fair Value
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total		Carrying Amount
	(in thousands)
March 31, 2015	$	—	$	698,000	$	—	$	698,000	$	698,000
December 31, 2014	$	—	$	559,000	$	—	$	559,000	$	559,000

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Risk Management (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Contracts

The following table summarizes the fair values of TEP’s derivative contracts included in the condensed consolidated balance sheets:

	Balance Sheet Location	March 31, 2015		December 31, 2014
		(in thousands)
Energy commodity derivative contracts	Current assets	$	90	$	—

Derivative Contracts Included in Consolidated Statements of Income

The following table summarizes the impact of derivative contracts for the three months ended March 31, 2015 and 2014:

		Amount of gain (loss) recognized in income on derivatives
	Location of gain (loss) recognized in income on derivatives	Three Months Ended March 31,
		2015		2014
		(in thousands)
Derivatives not designated as hedging contracts:
Energy commodity derivative contracts	Natural gas sales	$	90	$	(351	)

Derivative Instruments Maximum Potential Exposure To Credit Loss [Table Text Block]

The maximum potential exposure to credit losses on TEP’s derivative contracts at March 31, 2015 was:

	Asset Position
	(in thousands)
Gross	$	90
Netting agreement impact	—
Cash collateral held	—
Net Exposure	$	90

Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification

The following table summarizes the fair value measurements of TEP’s energy commodity derivative contracts as of March 31, 2015 based on the fair value hierarchy established by the Codification:

			Asset fair value measurements using
	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(in thousands)
TEP as of March 31, 2015
Energy commodity derivative contracts	$	90	$	—	$	90	$	—

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Legal and Environmental Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 12, 2015 bbl	Aug. 31, 2014 bbl	Oct. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Aggregate reserves for all claims				$ 0.6	$ 0.6
Crude Oil Spilled or Leaked	300	200
Environmental accruals				5.2	5.3
Tallgrass Interstate Gas Transmission, LLC (TIGT) [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			$ 2.0

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Property Plant and Equipment - Components of Property Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (77,390)	$ (59,200)
Property, plant and equipment	1,921,676	1,853,081
Crude Oil Pipelines [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	961,288	939,536
Natural Gas Pipe Lines
Property, Plant and Equipment [Line Items]
Property , plant and equipment	553,425	548,482
Processing & Treating
Property, Plant and Equipment [Line Items]
Property , plant and equipment	237,049	241,671
General and other [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	52,666	42,719
Construction work in progress [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	$ 194,638	$ 139,873

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Partnership Equity and Distributions (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Summary of Distributions

The following table shows the distributions for the periods indicated:

		Distributions
		Limited Partners Common and Subordinated Units		General Partner						Distributions per Limited Partner Unit
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2015	May 14, 2015 (1)	$	31,322	$	6,934	$	530	$	38,786	$	0.5200
December 31, 2014	February 13, 2015	23,782		4,039		473		28,294		0.4850
September 30, 2014	November 14, 2014	20,092		1,208		363		21,663		0.4100
June 30, 2014	August 14, 2014	18,596		758		330		19,684		0.3800
March 31, 2014	May 14, 2014	13,288		126		274		13,688		0.3250

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Net Income per Limited Partner Unit (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Summary of Net Income Per Limited Partner Unit

The following table illustrates the Partnership’s calculation of net income per common and subordinated unit for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015			2014
	(in thousands, except per unit amounts)
Net Income	$	22,990		$	16,617
Net loss attributable to noncontrolling interests	9,329			507
Net Income attributable to partners	32,319			17,124
Predecessor operations interest in net income	—			(4,224		)
General partner interest in net income	(7,438		)	(382		)
Common and subordinated unitholders' interest in net income	$	24,881		$	12,518
Basic net income per common and subordinated unit	$	0.47		$	0.31
Diluted net income per common and subordinated unit	$	0.46		$	0.30
Basic average number of common and subordinated units outstanding	52,727			40,500
Equity Participation Unit equivalent units	1,267			772
Diluted average number of common and subordinated units outstanding	53,994			41,272

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

These unaudited condensed consolidated financial statements and related notes for the three months endedMarch 31, 2015 and 2014 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board’s Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include disclosures required by GAAP for annual periods. The unaudited condensed consolidated financial statements for the three months ended ended March 31, 2015 and 2014 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair presentation of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation.

TEP’s financial results for the three months endedMarch 31, 2015 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2015. These unaudited condensed consolidated financial statements should be read in conjunction with TEP’s audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”) filed with the United States Securities and Exchange Commission (the “SEC”) on February 19, 2015.

The accompanying condensed consolidated financial statements of TEP include historical cost-basis accounts of the assets of Trailblazer for the periods prior to April 1, 2014, the date TEP acquired Trailblazer from TD, and Pony Express for the periods prior to September 1, 2014, the date TEP acquired a controlling 33.3% membership interest in Pony Express, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis.

As further discussed in Note 4 – Acquisitions, TEP closed the acquisition of Trailblazer on April 1, 2014 and the acquisition of a 33.3% membership interest in Pony Express effective September 1, 2014. As the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are considered transactions between entities under common control, and a change in reporting entity, the financial information presented for prior periods has been recast to include Trailblazer and the initial 33.3% membership interest in Pony Express for all periods presented. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to March 1, 2015 have not been recast to reflect the additional 33.3% membership interest.

The condensed consolidated financial statements include the accounts of TEP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net equity contributions of the Predecessor Entities included in the condensed consolidated statements of cash flows represent transfers of cash as a result of TD’s centralized cash management systems prior to April 1, 2014 for Trailblazer and September 1, 2014 for Pony Express, under which cash balances were swept daily and recorded as loans from the subsidiaries to TD. These loans were then periodically recorded as equity distributions. Pony Express participates in a cash management agreement with TD, which holds a 33.3% common membership interest in Pony Express, under which cash balances are swept daily and recorded as loans from Pony Express to TD.

Net income or loss from consolidated subsidiaries that are not wholly-owned by TEP is attributed to TEP and noncontrolling interests. This is done in accordance with substantive profit sharing arrangements, which generally follow the allocation of cash distributions and may not follow the respective ownership percentages held by TEP. Concurrent with TEP's acquisition of an initial 33.3% membership interest in Pony Express effective September 1, 2014, TEP, TD, and Pony Express entered into the Second Amended and Restated Limited Liability Agreement of Tallgrass Pony Express Pipeline, LLC ("the Second Amended Pony Express LLC Agreement"), which provided TEP a minimum quarterly preference payment of $16.65 million (prorated to approximately $5.4 million for the quarter ended September 30, 2014) through the quarter ending September 30, 2015. Effective March 1, 2015 with TEP's acquisition of an additional 33.3% membership interest in Pony Express, the Second Amended Pony Express LLC Agreement was further amended (as amended, "the Pony Express LLC Agreement") to increase the minimum quarterly preference payment to $36.65 million (prorated to approximately $23.5 million for the quarter ended March 31, 2015) and extend the term of the preference period through the quarter ending December 31, 2015. The Pony Express LLC Agreement provides that the net income or loss of Pony Express be allocated, to the extent possible, consistent with the allocation of Pony Express cash distributions. Under the terms of the Pony Express LLC Agreement, Pony Express distributions and net income for periods beginning after December 31, 2015 will be attributed to TEP and noncontrolling interests in accordance with the respective ownership interests.

A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity’s economic performance. TEP has presented separately in its condensed consolidated balance sheets, to the extent material, the assets of its consolidated VIE that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of TEP's consolidated VIE for which creditors do not have recourse to TEP's general credit. Pony Express is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, TEP has determined that it is the primary beneficiary as it has the power to direct matters that most significantly impact the activities of Pony Express and has the right to receive benefits of Pony Express that could potentially be significant to Pony Express. TEP has consolidated Pony Express accordingly. For additional information see Note 3 – Variable Interest Entities.

Use of Estimates

Certain amounts included in or affecting these consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on TEP’s business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.

Accounting Pronouncements Issued But Not Yet Effective

Accounting Standards Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)"

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract.

The amendments in ASU 2014-09 are effective for public entities for annual reporting periods beginning after December 15, 2016, and for interim periods within that reporting period. Early application is not permitted. TEP is currently evaluating the impact of ASU 2014-09.

ASU No. 2014-12, "Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period"

In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides explicit guidance on accounting for share-based payments requiring a specific performance target to be achieved in order for employees to become eligible to vest in the awards when that performance target may be achieved after the requisite service period for the award. The ASU requires that such performance targets be treated as a performance condition, and should not be reflected in the estimate of the grant-date fair value of the award. Instead, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved.

ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of ASU 2014-12 is not expected to have a material impact on TEP's financial position and results of operations.

ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis"

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 will change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 will modify the evaluation of whether limited partnerships and other similar legal entities are considered VIEs or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, and change certain aspects of the consolidation analysis for reporting entities that are involved with VIEs, particularly for those with fee arrangements and related party relationships.

The amendments in ASU 2015-02 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early application is permitted, including adoption in an interim period. TEP is currently evaluating the impact of ASU 2015-02.

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Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Summary of TEP's Segment Information of Revenue

The following tables set forth TEP’s segment information for the periods indicated:

	Three Months Ended March 31, 2015							Three Months Ended March 31, 2014
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
			(in thousands)							(in thousands)
Natural Gas Transportation & Logistics	$	33,610	$	(1,346	)	$	32,264	$	39,631	$	(1,255	)	$	38,376
Crude Oil Transportation & Logistics	50,381		—			50,381		—		—			—
Processing & Logistics	32,030		—			32,030		56,403		—			56,403
Corporate and Other	—		—			—		—		—			—
Total revenue	$	116,021	$	(1,346	)	$	114,675	$	96,034	$	(1,255	)	$	94,779

Summary of TEP's Segment Information of Earnings

	Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
Adjusted EBITDA:	Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA			Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA
	(in thousands)									(in thousands)
Natural Gas Transportation & Logistics	$	19,246		$	(1,346	)	$	17,900		$	19,862		$	(1,255	)	$	18,607
Crude Oil Transportation & Logistics	25,506			1,346			26,852			—			—			—
Processing & Logistics	8,718			—			8,718			9,596			—			9,596
Corporate and Other	(635		)	—			(635		)	(625		)	—			(625		)
Reconciliation to Net Income:
Interest expense, net							3,440									1,294
Depreciation and amortization expense, net of noncontrolling interest							20,533									7,804
Non-cash loss from asset sales							4,483									—
Non-cash (gain) loss related to derivative instruments							(90		)							351
Non-cash compensation expense							1,527									941
Distributions from unconsolidated investment							—									508
Equity in earnings of unconsolidated investment							—									(444		)
Non-cash loss allocated to noncontrolling interest							(9,377		)							—
Net Income attributable to partners							$	32,319								$	17,124

Summary of TEP's Segment Information of Assets

	Three Months Ended March 31,
Capital Expenditures:	2015		2014
			(in thousands)
Natural Gas Transportation & Logistics	$	3,865	$	9,626
Crude Oil Transportation & Logistics	6,480		196,437
Processing & Logistics	2,955		3,048
Corporate and Other	—		—
Total capital expenditures	$	13,300	$	209,111

Assets:	March 31, 2015		December 31, 2014
	(in thousands)
Natural Gas Transportation & Logistics	$	719,510	$	716,106
Crude Oil Transportation & Logistics	1,391,417		1,394,793
Processing & Logistics	337,303		340,620
Corporate and Other	5,321		5,678
Total assets	$	2,453,551	$	2,457,197

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Related Party Transactions - Schedule of Transactions with Affiliated Companies (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Operation and maintenance [Member]
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	$ 5,423	[1]	$ 4,348	[1]
General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	9,256	[1]	4,927	[1]
Property, Plant and Equipment [Member]
Related Party Transaction [Line Items]
Related Party Transaction Costs Capitalized From Transactions With Related Party	$ 1,307		$ 3,400

[1] Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.

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Partnership Equity and Distributions - Summary of Distributions (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Feb. 27, 2015	Apr. 24, 2015
Distribution Made to Limited Partner [Line Items]
Contributions from Predecessor Member, net						$ 63,170
Shares Issued, Price Per Share							$ 50.82
Distribution Made to Limited Partner, Distribution Date	May 14, 2015	[1]	Feb. 13, 2015	Nov. 14, 2014	Aug. 14, 2014	May 14, 2014
Distributions Limited Partners Common	31,322		23,782	20,092	18,596	13,288
Distributions declared	38,786		28,294	21,663	19,684	13,688
Distributions per Limited Partner unit	$ 0.5200		$ 0.4850	$ 0.4100	$ 0.3800	$ 0.3250
General Partner
Distribution Made to Limited Partner [Line Items]
Contributions from Predecessor Member, net						0
Distributions General Partner Incentive	6,934		4,039	1,208	758	126
Distributions declared	$ 530		$ 473	$ 363	$ 330	$ 274
Common unitholders
Distribution Made to Limited Partner [Line Items]
Unitholders units issued (in shares)	60,234,105		32,834,105
Common unitholders | Subsequent Event
Distribution Made to Limited Partner [Line Items]
Unitholders units issued (in shares)								60,234,105

[1] (1) The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

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CONDENSED BALANCE SHEETS (UNAUDITED) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 876,000	$ 867,000
Accounts receivable, net	46,268,000	39,768,000
Receivable from related party	0	73,393,000
Gas imbalances	911,000	2,442,000
Inventories	12,679,000	13,045,000
Derivative assets at fair value	90,000	0
Prepayments and other current assets	2,728,000	2,766,000
Total Current Assets	63,552,000	132,281,000
Property, plant and equipment, net	1,921,676,000	1,853,081,000
Goodwill	343,288,000	343,288,000
Intangible asset, net	102,519,000	104,538,000
Deferred financing costs	5,119,000	5,528,000
Deferred charges and other assets	17,397,000	18,481,000
Total Assets	2,453,551,000	2,457,197,000
Current Liabilities:
Accounts payable, including $41,363 and $45,534 related to variable interest entities	64,047,000	62,329,000
Accounts payable to related parties	3,000,000	3,915,000
Gas imbalances	3,490,000	3,611,000
Accrued taxes	15,308,000	3,989,000
Accrued liabilities	6,447,000	9,384,000
Other current liabilities	12,094,000	13,340,000
Total Current Liabilities	104,386,000	96,568,000
Long-term debt	698,000,000	559,000,000
Other long-term liabilities and deferred credits	6,213,000	6,478,000
Total Long-term Liabilities	704,213,000	565,478,000
Commitments and Contingencies
Equity:
General partner (834,391 units issued and outstanding at March 31, 2015 and December 31, 2014)	(357,145,000)	(35,743,000)
Total Partners’ Equity	1,273,302,000	1,038,723,000
Noncontrolling interests	371,650,000	756,428,000
Total Equity	1,644,952,000	1,795,151,000
Total Liabilities and Equity	2,453,551,000	2,457,197,000
Common unitholders
Equity:
Unitholders	1,630,447,000	800,333,000
Subordinated unitholder
Equity:
Unitholders	$ 0	$ 274,133,000

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Risk Management - Schedule of Fair Value of Derivative Contracts (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$ 90,000	$ 0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$ 90,000	$ 0
Commodity [Member] | Current Portion of Derivative Notional Amount [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount	0.9

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CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	$ 1,273,302	$ 1,060,550	$ 1,038,723	$ 991,162
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	1,644,952	1,510,111	1,795,151	1,309,101
Net income (loss)	32,319	17,124
Issuance of units to public, net of offering costs	551,949
Distributions to unitholders	28,294	13,082
Noncash compensation expense	2,933	2,176
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		63,170
TEP Predecessor Post-IPO [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	0	314,615	0	247,221
Net income (loss)	0	4,224
Issuance of units to public, net of offering costs	0
Distributions to unitholders	0	0
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		63,170
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	(357,145)	14,135	(35,743)	14,078
Net income (loss)	7,438	382
Issuance of units to public, net of offering costs	0
Distributions to unitholders	4,512	(325)
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		0
Common unitholders | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	1,630,447	457,230	800,333	455,197
Net income (loss)	19,701	7,511
Issuance of units to public, net of offering costs	(551,949)
Distributions to unitholders	15,925	(7,654)
Noncash compensation expense	(2,933)	2,176
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	271,456
Contributions from Predecessor Member, net		0
Subordinated Units [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	0	274,570	274,133	274,666
Net income (loss)	5,180	5,007
Issuance of units to public, net of offering costs	0
Distributions to unitholders	7,857	(5,103)
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	(271,456)
Contributions from Predecessor Member, net		0
Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	371,650	449,561	756,428	317,939
Net income (loss)	(9,329)	(507)
Issuance of units to public, net of offering costs	0
Distributions to unitholders	0	0
Noncash compensation expense	0	0
Contributions from noncontrolling interest	2,379
Distributions to noncontrolling interest	(2,156)
Conversion of subordinated units	0
Contributions from Predecessor Member, net		132,129
Total Partner Equity Including Portion Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	22,990	16,617
Issuance of units to public, net of offering costs	551,949
Distributions to unitholders	28,294	13,082
Noncash compensation expense	2,933	2,176
Contributions from noncontrolling interest	2,379
Distributions to noncontrolling interest	(2,156)
Conversion of subordinated units	0
Contributions from Predecessor Member, net		195,299
Pony Express Pipeline
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)		(253)
Acquisition of additional 33.3% membership interest in Pony Express	(324,328)
Pony Express Pipeline | TEP Predecessor Post-IPO [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	(324,328)
Pony Express Pipeline | Common unitholders | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | Subordinated Units [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	(375,672)
Pony Express Pipeline | Total Partner Equity Including Portion Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	$ (700,000)

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Reporting Segments - Summary of TEP's Segment Information of Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reconciliation to Net Income:
Interest expense (income), net	$ 3,440	$ 1,296
Depreciation and amortization expense	20,605	8,309
Noncash compensation expense	1,527	941
Equity in earnings of unconsolidated investment	0	(444)
Net income (loss)	32,319	17,124
TEP
Reconciliation to Net Income:
Net income (loss)	32,319	17,124
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	17,900	18,607
TEP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	26,852	0
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	8,718	9,596
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(635)	(625)
TEP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	19,246	19,862
TEP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	25,506	0
TEP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	8,718	9,596
TEP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(635)	(625)
TEP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	(1,346)	(1,255)
TEP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,346	0
TEP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	0	0
TEP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	0	0
TEP | Segment Reconciling Items
Reconciliation to Net Income:
Interest expense (income), net	3,440	1,294
Depreciation and amortization expense	20,533	7,804
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(4,483)	0
Non-cash (gain) loss related to derivative instruments	(90)	351
Noncash compensation expense	1,527	941
Distributions from unconsolidated investment	0	508
Equity in earnings of unconsolidated investment	0	(444)
Non-cash loss allocated to noncontrolling interest	$ (9,377)	$ 0

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Variable Interest Entity (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Mar. 31, 2015
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%	33.30%
Funds Maintained by Pony to Fund Remaining Construction	$ 270
Cash Contributed to Pony	570
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%		33.30%	66.70%
Preferred Membership, Percentage Acquired	100.00%		33.30%
Funds Maintained by Pony to Fund Remaining Construction	270
Cash Contributed to Pony	$ 570

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

These unaudited condensed consolidated financial statements and related notes for the three months endedMarch 31, 2015 and 2014 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board’s Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include disclosures required by GAAP for annual periods. The unaudited condensed consolidated financial statements for the three months ended ended March 31, 2015 and 2014 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair presentation of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation.

TEP’s financial results for the three months endedMarch 31, 2015 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2015. These unaudited condensed consolidated financial statements should be read in conjunction with TEP’s audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”) filed with the United States Securities and Exchange Commission (the “SEC”) on February 19, 2015.

The accompanying condensed consolidated financial statements of TEP include historical cost-basis accounts of the assets of Trailblazer for the periods prior to April 1, 2014, the date TEP acquired Trailblazer from TD, and Pony Express for the periods prior to September 1, 2014, the date TEP acquired a controlling 33.3% membership interest in Pony Express, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis.

Consolidation

As further discussed in Note 4 – Acquisitions, TEP closed the acquisition of Trailblazer on April 1, 2014 and the acquisition of a 33.3% membership interest in Pony Express effective September 1, 2014. As the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are considered transactions between entities under common control, and a change in reporting entity, the financial information presented for prior periods has been recast to include Trailblazer and the initial 33.3% membership interest in Pony Express for all periods presented. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to March 1, 2015 have not been recast to reflect the additional 33.3% membership interest.

The condensed consolidated financial statements include the accounts of TEP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net equity contributions of the Predecessor Entities included in the condensed consolidated statements of cash flows represent transfers of cash as a result of TD’s centralized cash management systems prior to April 1, 2014 for Trailblazer and September 1, 2014 for Pony Express, under which cash balances were swept daily and recorded as loans from the subsidiaries to TD. These loans were then periodically recorded as equity distributions. Pony Express participates in a cash management agreement with TD, which holds a 33.3% common membership interest in Pony Express, under which cash balances are swept daily and recorded as loans from Pony Express to TD.

Net income or loss from consolidated subsidiaries that are not wholly-owned by TEP is attributed to TEP and noncontrolling interests. This is done in accordance with substantive profit sharing arrangements, which generally follow the allocation of cash distributions and may not follow the respective ownership percentages held by TEP. Concurrent with TEP's acquisition of an initial 33.3% membership interest in Pony Express effective September 1, 2014, TEP, TD, and Pony Express entered into the Second Amended and Restated Limited Liability Agreement of Tallgrass Pony Express Pipeline, LLC ("the Second Amended Pony Express LLC Agreement"), which provided TEP a minimum quarterly preference payment of $16.65 million (prorated to approximately $5.4 million for the quarter ended September 30, 2014) through the quarter ending September 30, 2015. Effective March 1, 2015 with TEP's acquisition of an additional 33.3% membership interest in Pony Express, the Second Amended Pony Express LLC Agreement was further amended (as amended, "the Pony Express LLC Agreement") to increase the minimum quarterly preference payment to $36.65 million (prorated to approximately $23.5 million for the quarter ended March 31, 2015) and extend the term of the preference period through the quarter ending December 31, 2015. The Pony Express LLC Agreement provides that the net income or loss of Pony Express be allocated, to the extent possible, consistent with the allocation of Pony Express cash distributions. Under the terms of the Pony Express LLC Agreement, Pony Express distributions and net income for periods beginning after December 31, 2015 will be attributed to TEP and noncontrolling interests in accordance with the respective ownership interests.

A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity’s economic performance. TEP has presented separately in its condensed consolidated balance sheets, to the extent material, the assets of its consolidated VIE that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of TEP's consolidated VIE for which creditors do not have recourse to TEP's general credit. Pony Express is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, TEP has determined that it is the primary beneficiary as it has the power to direct matters that most significantly impact the activities of Pony Express and has the right to receive benefits of Pony Express that could potentially be significant to Pony Express. TEP has consolidated Pony Express accordingly. For additional information see Note 3 – Variable Interest Entities.

Use of Estimates

Use of Estimates

Certain amounts included in or affecting these consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on TEP’s business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.

Accounting Pronouncements Issued But Not Yet Effective

Accounting Pronouncements Issued But Not Yet Effective

Accounting Standards Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)"

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract.

The amendments in ASU 2014-09 are effective for public entities for annual reporting periods beginning after December 15, 2016, and for interim periods within that reporting period. Early application is not permitted. TEP is currently evaluating the impact of ASU 2014-09.

ASU No. 2014-12, "Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period"

In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides explicit guidance on accounting for share-based payments requiring a specific performance target to be achieved in order for employees to become eligible to vest in the awards when that performance target may be achieved after the requisite service period for the award. The ASU requires that such performance targets be treated as a performance condition, and should not be reflected in the estimate of the grant-date fair value of the award. Instead, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved.

ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of ASU 2014-12 is not expected to have a material impact on TEP's financial position and results of operations.

ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis"

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 will change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 will modify the evaluation of whether limited partnerships and other similar legal entities are considered VIEs or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, and change certain aspects of the consolidation analysis for reporting entities that are involved with VIEs, particularly for those with fee arrangements and related party relationships.

The amendments in ASU 2015-02 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early application is permitted, including adoption in an interim period. TEP is currently evaluating the impact of ASU 2015-02.

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Variable Interest Entity Pony Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Assets, Current	$ 63,552	$ 132,281
Total Assets	2,453,551	2,457,197
Liabilities, Current	104,386	96,568
Pony Express Pipeline
Variable Interest Entity [Line Items]
Assets, Current	27,315	93,019
Assets, Noncurrent	1,362,803	1,300,816
Total Assets	1,390,118	1,393,835
Liabilities, Current	57,336	52,547
Liabilities	$ 57,336	$ 52,547

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

Impact of Adjustments Related to Transaction Among Entities Under Common Control, Income Statement

The following tables present the previously reported condensed consolidated statements of income for the three months ended March 31, 2014, adjusted for the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express:

	Three Months Ended March 31, 2014
	TEP			Consolidate Trailblazer Pipeline Company LLC		Consolidate Tallgrass Pony Express Pipeline, LLC			TEP (As currently reported)
	(in thousands)
Revenues:
Natural gas liquids sales	$	48,907		$	—	$	—		$	48,907
Natural gas sales	2,196			2,612		—			4,808
Transportation services	27,051			7,053		—			34,104
Processing and other revenues	6,808			152		—			6,960
Total Revenues	84,962			9,817		—			94,779
Operating Costs and Expenses:
Cost of sales	45,543			2,663		—			48,206
Cost of transportation services	4,903			214		—			5,117
Operations and maintenance	7,286			727		—			8,013
Depreciation and amortization	6,514			1,038		757			8,309
General and administrative	6,201			448		—			6,649
Taxes, other than income taxes	1,456			500		—			1,956
Total Operating Costs and Expenses	71,903			5,590		757			78,250
Operating Income (Loss)	13,059			4,227		(757		)	16,529
Other (Expense) Income:
Interest (expense) income, net	(1,324		)	31		(3		)	(1,296		)
Equity in earnings of unconsolidated investment	444			—		—			444
Other income, net	721			219		—			940
Total Other (Expense) Income	(159		)	250		(3		)	88
Net Income (Loss)	12,900			4,477		(760		)	16,617
Net loss attributable to noncontrolling interests	—			—		507			507
Net income (loss) attributable to partners	$	12,900		$	4,477	$	(253	)	$	17,124

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Description of Business

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business

Tallgrass Energy Partners, LP ("TEP" or the "Partnership") is a Delaware limited partnership formed in February 2013 to own, operate, acquire and develop midstream energy assets in North America. TEP currently provides natural gas transportation and storage services for customers in the Rocky Mountain and Midwest regions of the United States through the Tallgrass Interstate Gas Transmission System, which we refer to as the TIGT System, and the Trailblazer Pipeline. TEP provides crude oil transportation to customers in Wyoming and the surrounding region, servicing the Bakken oil production area of North Dakota and eastern Montana through our membership interest in Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a crude oil pipeline system commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma. We refer to this crude oil pipeline system as the Pony Express System. TEP also provides services for customers in Wyoming at its Casper and Douglas natural gas processing facilities, or collectively the Midstream Facilities, and provides water business services to customers in Colorado and Texas through BNN Water Solutions, LLC ("Water Solutions"). TEP's operations are strategically located in and provide services to certain key United States hydrocarbon basins, including the Denver-Julesburg, Powder River, Wind River, Permian and Hugoton-Anadarko Basins and the Niobrara, Mississippi Lime, Eagle Ford and Bakken shale formations.

The 33,878,625 common units held by the public constitute approximately 56.2% of TEP’s aggregate outstanding common units and approximately 55.5% of TEP’s aggregate outstanding common and general partner units at March 31, 2015. Tallgrass Development, LP ("TD") held 26,355,480 common units at March 31, 2015, including the 16,200,000 subordinated units converted to common units on February 17, 2015, as discussed further in Note 10 - Partnership Equity and Distributions, which comprised approximately 43.8% of TEP’s aggregate outstanding common units and approximately 43.2% of TEP’s aggregate outstanding common and general partner units. In addition, 834,391 general partner units, representing an approximate 1.4% general partner interest in TEP at March 31, 2015, and all of the incentive distribution rights ("IDRs") are held by Tallgrass MLP GP, LLC (the "general partner"). The partnership agreement requires TEP to distribute its available cash on a quarterly basis, subject to certain terms and conditions. For additional information, see Note 10 - Partnership Equity and Distributions.

The term "Trailblazer Predecessor" refers to Trailblazer Pipeline Company LLC ("Trailblazer") for the period from November 13, 2012 to its acquisition by TEP on April 1, 2014, and the term "Pony Express Predecessor" refers to Pony Express for the period from November 13, 2012 to September 1, 2014, the date on which TEP acquired a controlling 33.3% membership interest. Trailblazer Predecessor and Pony Express Predecessor are collectively referred to as the Predecessor Entities, as further discussed in Note 2 – Summary of Significant Accounting Policies. Financial results for all prior periods have been recast to reflect the operations of the Predecessor Entities. Predecessor Equity as presented in the condensed consolidated financial statements represents the capital account activity of Trailblazer Predecessor prior to April 1, 2014 and of Pony Express Predecessor prior to September 1, 2014. For additional information regarding these acquisitions, see Note 4 – Acquisitions.

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CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Accounts payable, including $41,363 and $45,534 related to variable interest entities	$ 64,047,000	$ 62,329,000
General partner units issued (in shares)	834,391	834,391
General partner units outstanding (in shares)	834,391	834,391
Common unitholders
Unitholders units issued (in shares)	60,234,105	32,834,105
Unitholders units outstanding (in shares)	60,234,105	82,834,105
Subordinated unitholder
Unitholders units issued (in shares)	0	16,200,000
Unitholders units outstanding (in shares)	0	16,200,000
Variable Interest Entity, Primary Beneficiary [Member]
Accounts payable, including $41,363 and $45,534 related to variable interest entities	$ 41,363	$ 45,534

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Net Income per Limited Partner Unit

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Net Income per Limited Partner Unit

The Partnership’s net income is allocated to the general partner and the limited partners, including the holders of the subordinated units, in accordance with their respective ownership percentages, after giving effect to incentive distributions paid to the general partner. Basic and diluted net income per limited partner unit is calculated by dividing limited partners’ interest in net income, less general partner incentive distributions, by the weighted average number of outstanding limited partner units during the period.

TEP computes earnings per unit using the two-class method for Master Limited Partnerships as prescribed in the FASB guidance. The two-class method requires that securities that meet the definition of a participating security be considered for inclusion in the computation of basic earnings per unit. Under the two-class method, earnings per unit is calculated as if all of the earnings for the period were distributed under the terms of the partnership agreement, regardless of whether the general partner has discretion over the amount of distributions to be made in any particular period, whether those earnings would actually be distributed during a particular period from an economic or practical perspective, or whether the general partner has other legal or contractual limitations on its ability to pay distributions that would prevent it from distributing all of the earnings for a particular period.

TEP calculates net income available to limited partners based on the distributions pertaining to the current period’s net income. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner and limited partners in accordance with the contractual terms of the partnership agreement and as further prescribed in the FASB guidance under the two-class method.

The two-class method does not impact TEP’s overall net income or other financial results; however, in periods in which aggregate net income exceeds its aggregate distributions for such period, it will have the impact of reducing net income per limited partner unit. This result occurs as a larger portion of TEP’s aggregate earnings, as if distributed, is allocated to the incentive distribution rights of the general partner, even though TEP makes distributions on the basis of available cash and not earnings. In periods in which TEP’s aggregate net income does not exceed its aggregate distributions for such period, the two-class method does not have any impact on our calculation of earnings per limited partner unit.

Basic earnings per unit is computed by dividing net earnings attributable to unitholders by the weighted average number of units outstanding during each period. Diluted earnings per unit reflects the potential dilution of common equivalent units that could occur if equity participation units are converted into common units.

All net income or loss from Trailblazer prior to its acquisition on April 1, 2014 and Pony Express prior to its acquisition effective September 1, 2014 is allocated to predecessor operations in the table below. Historical earnings of transferred businesses for periods prior to the date of the common control drop-down transaction are solely those of the general partner and, therefore we have appropriately excluded any allocation to the limited partner units when determining net income available to common and subordinated unitholders. We present the financial results of any transferred business prior to the drop down transaction date in the line item "Predecessor operations interest in net (income) loss" in the table below.

The following table illustrates the Partnership’s calculation of net income per common and subordinated unit for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015			2014
	(in thousands, except per unit amounts)
Net Income	$	22,990		$	16,617
Net loss attributable to noncontrolling interests	9,329			507
Net Income attributable to partners	32,319			17,124
Predecessor operations interest in net income	—			(4,224		)
General partner interest in net income	(7,438		)	(382		)
Common and subordinated unitholders' interest in net income	$	24,881		$	12,518
Basic net income per common and subordinated unit	$	0.47		$	0.31
Diluted net income per common and subordinated unit	$	0.46		$	0.30
Basic average number of common and subordinated units outstanding	52,727			40,500
Equity Participation Unit equivalent units	1,267			772
Diluted average number of common and subordinated units outstanding	53,994			41,272

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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 11, 2015
Document Information [Line Items]
Entity Registrant Name	TALLGRASS ENERGY PARTNERS, LP
Entity Central Index Key	0001569134
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Trading Symbol	TEP
Amendment Flag	false
Common Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		60,234,105
General Partner Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		834,391

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Regulatory Matters

3 Months Ended

Mar. 31, 2015

Regulatory Matters [Abstract]

Regulatory Matters

Pony Express Abandonment – FERC Docket CP12-495

On August 6, 2012, Tallgrass Interstate Gas Transmission, LLC, or TIGT, which owns the TIGT System, filed an application to: (1) abandon for FERC purposes approximately 433 miles of mainline natural gas pipeline facilities, along with associated rights of way and other related equipment (collectively, the "Pony Express Assets"), and the natural gas service therefrom, by transferring those assets to Pony Express, which subsequently converted the Pony Express Assets into crude oil pipeline facilities; and (2) construct and operate certain replacement-type facilities necessary to continue service to existing natural gas firm transportation customers following the conversion, which we refer to as the Replacement Gas Facilities. This project is referred to as the "Pony Express Abandonment." The FERC abandonment does not constitute an abandonment for accounting purposes. Pursuant to the terms of the Purchase and Sale Agreement filed with the FERC and cited by the FERC in approving the Pony Express Abandonment, Pony Express is required to reimburse TIGT for the net book value of the Pony Express Assets plus other TIGT incurred costs required to construct the Replacement Gas Facilities and to arrange substitute gas transportation services to certain TIGT shippers.

The Pony Express Abandonment and completion of the Pony Express Project by Pony Express re-deployed existing pipeline assets to meet the growing market need to transport oil supplies while at the same time continuing to operate TIGT’s natural gas transportation facilities to meet all current and expected needs of its natural gas customers. By a FERC order issued September 12, 2013, TIGT was granted authorization to abandon the Pony Express Assets and construct the Replacement Gas Facilities. On October 7, 2013 TIGT commenced the mobilization of personnel and equipment for the construction of the Replacement Gas Facilities necessary to complete the Pony Express Abandonment to continue service to existing TIGT customers. In December 2013, TIGT removed the Pony Express Assets from gas service and sold those assets to Pony Express. On May 1, 2014, TIGT commenced commercial service through all of the Replacement Gas Facilities, with the exception of Units 3 and 4 at the Tescott Compressor Station. Service through Units 3 and 4 at the Tescott Compressor Station commenced on May 30, 2014.

Trailblazer

2013 Rate Case Filing - Docket No. RP13-1031

On July 1, 2013, Trailblazer made a rate filing with the FERC pursuant to Section 4 of the Natural Gas Act in Docket No. RP13-1031. In this filing, Trailblazer proposed an overall cost of service of $25.7 million, an increase of the base rates, rolled-in base and fuel rates, an overall rate of return of 10.94% and new depreciation rates. On July 31, 2013, the FERC issued an order accepting Trailblazer’s filing and suspending the filed tariff rates, subject to refund, for the full statutorily permitted five-month suspension period and setting certain issues for hearing. The FERC resolved the non-rate aspects of Trailblazer’s rate case in an order dated December 30, 2013.

In conjunction with this filing for rolled-in fuel rates, Trailblazer elected to not seek recovery of unrecovered fuel costs incurred prior to January 1, 2014. Consequently, Trailblazer has recognized expenses related to unrecovered fuel costs of $578,000 for the period from November 13, 2012 to December 31, 2012, $6.0 million for period from January 1, 2012 to November 12, 2012 and $8.4 million during the year ended December 31, 2013.

On January 22, 2014, Trailblazer, the FERC’s Trial Staff, and the active parties in the pipeline’s general rate case finalized a settlement in principle resolving the pending rate issues, including: (i) establishing transportation rates, as well as fuel and lost and unaccounted for charges; (ii) providing a limited profit sharing arrangement for certain revenues earned from interruptible and short-term firm transport; and (iii) setting the minimum and maximum time that can elapse before Trailblazer’s next rate case at the FERC. Trailblazer filed a motion with FERC’s Chief Administrative Law Judge to accept the settlement rates on an interim basis ("Interim Rates") while the participants finalized a definitive settlement. The Chief Administrative Law Judge accepted the Interim Rates effective February 1, 2014. On February 24, 2014, Trailblazer filed an uncontested offer of settlement ("Stipulation and Agreement") among active party shippers. The Stipulation and Agreement established the Interim Rates as final settlement rates effective February 1, 2014, subject to the issuance of refunds to certain shippers for January 2014 transportation services and revised fuel and lost and unaccounted for rates, effective July 1, 2014. On March 11, 2014, the Presiding Administrative Law Judge certified the Stipulation and Agreement. On May 29, 2014, the FERC approved the Stipulation and Agreement. On June 30, 2014, Trailblazer filed tariff sheets to implement the Stipulation and Agreement effective July 1, 2014. Estimated refunds were reserved from revenues recorded in January 2014. On July 1, 2014, Trailblazer submitted refunds to its customers for amounts collected in excess of amounts that would have been collected under the Settlement Rates, with interest, and on July 18, 2014, filed a report of refunds with the FERC. The FERC issued orders accepting the tariff sheets with the requested effective date of July 1, 2014 and accepting the refund report filing on July 25, 2014 and August 7, 2014, respectively.

2015 Annual Fuel Tracker Filing - Docket No. RP15-841-000

On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. This filing incorporates the revised fuel tracker and power cost tracker mechanisms agreed to in the 2013 Rate Case Filing settlement.

Pony Express

In anticipation of placing the Pony Express System into service, several petitions for declaratory orders were submitted to the FERC by Pony Express and certain upstream pipelines interconnected with the Pony Express System to address considerations related to the Pony Express System and other matters. In response to these petitions, the FERC issued three declaratory orders (two in 2012 and one in 2014) approving the proposed rate structures and terms of service for the Pony Express System.

On September 19, 2014 Pony Express filed with the FERC to adopt a tariff for initial local Non Contract Rates as well as initial Rules and Regulations in accordance with the Interstate Commerce Act to be effective starting on October 1, 2014. Local Contract Tariff rates were filed with the FERC on October 29, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express System from the Belle Fourche Pipeline were filed on October 16, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express pipeline system from Hiland Pipeline Company were filed on February 27, 2015 and effective April 1, 2015.

Other Regulatory Matters

There are currently no proceedings challenging the rates of Pony Express, TIGT, or Trailblazer. Regulators, as well as shippers, do have rights, under circumstances prescribed by applicable regulations, to challenge the rates that TIGT and Trailblazer charge. Further, the statute governing service by Pony Express allows parties having standing to file complaints in regard to existing tariff rates and provisions. If the complaint is not resolved, the FERC may conduct a hearing and order a crude oil pipeline to make reparations going back for up to two years prior to the date on which a complaint was filed if a rate is found to be unjust and unreasonable. TEP can provide no assurance that current rates will remain unchallenged. Any successful challenge could have a material, adverse effect on TEP’s future earnings and cash flows.

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Natural gas liquids sales	$ 21,025	$ 48,907
Natural gas sales	844	4,808
Natural gas transportation services	32,148	34,104
Crude oil transportation services	50,381	0
Processing and other revenues	10,277	6,960
Total Revenues	114,675	94,779
Operating Costs and Expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	19,593	48,206
Cost of transportation services (exclusive of depreciation and amortization shown below)	10,715	5,117
Operations and maintenance	9,575	8,013
Depreciation and amortization	20,605	8,309
General and administrative	12,689	6,649
Taxes, other than income taxes	11,297	1,956
Loss on sale of assets	4,483	0
Total Operating Costs and Expenses	88,957	78,250
Operating Income	25,718	16,529
Other (Expense) Income:
Interest expense, net	(3,440)	(1,296)
Equity in earnings of unconsolidated investment	0	444
Other income, net	712	940
Total Other (Expense) Income	(2,728)	88
Net Income	22,990	16,617
Net loss attributable to noncontrolling interests	(9,329)	(507)
Net income attributable to partners	32,319	17,124
Net loss attributable to noncontrolling interests
Predecessor operations interest in net income	0	(4,224)
Basic net income per common and subordinated unit	(7,438)	(382)
Diluted net income per common and subordinated unit	$ 24,881	$ 12,518
Basic average number of common and subordinated units outstanding	$ 0.47	$ 0.31
Diluted average number of common and subordinated units outstanding	$ 0.46	$ 0.30
Basic average number of common and subordinated units outstanding	52,727	40,500
Diluted average number of common and subordinated units outstanding	53,994	41,272

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Inventory

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Inventory

The components of inventory at March 31, 2015 and December 31, 2014 consisted of the following:

	March 31, 2015		December 31, 2014
	(in thousands)
Gas in underground storage	$	6,055	$	8,896
Materials and supplies	4,600		3,049
Crude oil	1,592		581
Natural gas liquids	432		519
Total inventory	$	12,679	$	13,045

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Related Party Transactions

3 Months Ended

Mar. 31, 2015

Related Party Transactions [Abstract]

Related Party Transactions

TEP has no employees. TD, through its wholly-owned subsidiary Tallgrass Operations, LLC ("Tallgrass Operations"), provided and charged TEP for direct and indirect costs of services  provided to us or incurred on our behalf including employee labor costs, information technology services, employee health and retirement benefits, and all other expenses necessary or appropriate to the conduct of our business. TEP recorded these costs on the accrual basis in the period in which TD incurred them. On May 17, 2013, in connection with the closing of TEP’s initial public offering, TEP and its general partner entered into an Omnibus Agreement with TD and certain of its affiliates, including Tallgrass Operations (the "Omnibus Agreement"). The Omnibus Agreement provides that, among other things, TEP will reimburse TD and its affiliates for all expenses they incur and payments they make on TEP’s behalf, including the costs of employee and director compensation and benefits as well as the cost of the provision of certain centralized corporate functions performed by TD, including legal, accounting, cash management, insurance administration and claims processing, risk management, health, safety and environmental, information technology and human resources in each case to the extent reasonably allocable to TEP.

For the first quarter of 2015, TEP’s general and administrative costs under the Omnibus Agreement were $5.4 million, excluding costs attributable to Pony Express. Pony Express had general and administrative costs for the first quarter of 2015 of $5.2 million. TEP also pays a quarterly reimbursement to TD for costs associated with being a public company. The quarterly public company reimbursement was $635,000 for the first quarter of 2015. These amounts will be periodically reviewed and adjusted as necessary to continue to reflect reasonable allocation of costs to TEP.

Due to the cash management agreement discussed in Note 2 – Summary of Significant Accounting Policies, intercompany balances at the Predecessor Entities were periodically settled and treated as equity distributions prior to April 1, 2014 for Trailblazer and prior to September 1, 2014 for Pony Express. Balances lent to TD under the Pony Express cash management agreement effective September 1, 2014 are classified as related party receivables in the condensed consolidated balance sheets. TEP recognized interest income from TD of $0.4 million during the three months ended March 31, 2015 on the receivable balance under the Pony Express cash management agreement.

Totals of transactions with affiliated companies are as follows:

	Three Months Ended March 31,
	2015		2014
	(in thousands)
Charges to TEP: (1)
Property, plant and equipment, net	$	1,307	$	3,400
Operation and maintenance	$	5,423	$	4,348
General and administrative	$	9,256	$	4,927

⁽¹⁾  Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.

Details of balances with affiliates included in "Receivable from related party" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Receivable from related party:
Tallgrass Operations, LLC	$	—	$	73,393
Total receivable from related party	$	—	$	73,393
Accounts payable to related parties:
Tallgrass Operations, LLC	$	2,980	$	3,894
Rockies Express Pipeline LLC	11		21
Deeprock Development, LLC	9		—
Total accounts payable to related parties	$	3,000	$	3,915

Balances of gas imbalances with affiliated shippers are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Affiliate gas balance receivables	$	168	$	275
Affiliate gas balance payables	$	410	$	455

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Variable Interest Entity (Tables)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities [Table Text Block]

The carrying amounts and classifications of the Pony Express assets and liabilities included in TEP's condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Current assets	$	27,315	$	93,019
Noncurrent assets	1,362,803		1,300,816
Total assets	$	1,390,118	$	1,393,835
Current liabilities	$	57,336	$	52,547
Total liabilities	$	57,336	$	52,547

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Legal and Environmental Matters

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Legal and Environmental Matters

Legal

In addition to the matters discussed below, TEP is a defendant in various lawsuits arising from the day-to-day operations of its business. Although no assurance can be given, TEP believes, based on its experiences to date, that the ultimate resolution of such routine items will not have a material adverse impact on its business, financial position, results of operations or cash flows.

TEP has evaluated claims in accordance with the accounting guidance for contingencies that it deems both probable and reasonably estimable and, accordingly, had aggregate reserves for legal claims of approximately $0.6 million as of March 31, 2015 and December 31, 2014.

TIGT

Prairie Horizon

On July 3, 2014, Prairie Horizon Agri-Energy LLC ("Prairie Horizon") filed an action in the District Court of Phillips County, Kansas against TIGT seeking damages from an alleged intrusion of foreign material and oil from TIGT into Prairie Horizon's ethanol plant. The matter was removed to the US District Court for the District of Kansas. Prairie Horizon asserts that this intrusion caused substantial damage to Prairie Horizon's ethanol production facilities and resulted in corresponding business income losses. Prairie Horizon also claims that the intrusion was a violation of TIGT's FERC Gas Tariff. Prairie Horizon alleges that it has suffered damages in the amount of approximately $2.0 million. TIGT believes Prairie Horizon's claims are without merit and plans to vigorously contest all of the claims in this matter.

System Failure

On June 13, 2013, a failure occurred on a segment of the TIGT pipeline system in Goshen County, Wyoming, resulting in the release of natural gas. The line was promptly brought back into service and the failure did not cause any known injuries, fatalities, fires or evacuations. TEP is currently working with PHMSA to develop a plan to close the Corrective Action Order received from PHMSA regarding the Goshen County failure and does not believe the cost of anticipated remediation activities will be material.

Pony Express

System Failures

On August 31, 2014, a leak occurred at the Sterling Pump Station on the Pony Express System in Logan County, Colorado, which resulted in a release of approximately 200 bbls of crude oil. The spill was entirely contained on TEP property and the costs to remediate were not material. In April 2015, PHSMA granted TEP's request to consider the Sterling Pump Station incident closed with no further action.

On March 12, 2015, an event occurred at the Yoder Pump Station in Goshen County, Wyoming, related to repair and replacement activities resulting in a spill of approximately 300 bbls of crude oil. TEP has presented its incident investigation findings to PHMSA and is currently working with PHMSA to resolve the matter. TEP does not believe the cost of anticipated remediation activities will be material.

Environmental

TEP is subject to a variety of federal, state and local laws that regulate permitted activities relating to air and water quality, waste disposal, and other environmental matters. TEP believes that compliance with these laws will not have a material adverse impact on its business, cash flows, financial position or results of operations. However, there can be no assurances that future events, such as changes in existing laws, the promulgation of new laws, or the development of new facts or conditions will not cause TEP to incur significant costs. TEP had environmental accruals of $5.2 million and $5.3 million at March 31, 2015 and December 31, 2014, respectively.

TMID

Casper Plant, U.S. EPA Notice of Violation

In August 2011, the U.S. EPA and the Wyoming Department of Environmental Quality ("WDEQ") conducted an inspection of the Leak Detection and Repair ("LDAR") Program at the Casper Gas Plant in Wyoming. In September 2011, TMID received a letter from the U.S. EPA alleging violations of the Standards of Performance of Equipment Leaks for Onshore Natural Gas Processing Plant requirements under the Clean Air Act. TMID received a letter from the U.S. EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the U.S. EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including attempted resolution of more recently identified LDAR issues.

Casper Mystery Bridge Superfund Site

The Casper Gas Plant is part of the Mystery Bridge Road/U.S. Highway 20 Superfund Site also known as Casper Mystery Bridge Superfund Site. Remediation work at the Casper Gas Plant has been completed and TEP has requested that the portion of the site attributable to TEP be delisted from the National Priorities List.

Casper Gas Plant

On November 25, 2014, WDEQ issued a Notice of Violation for violations of Part 60 Subpart OOOO related to the Depropanizer project (wv-14388, issued 7/9/13) in Docket No. 5506-14. TMID had discussed the issues in a meeting with WDEQ in Cheyenne on November 17, 2014, and submitted a disclosure on November 20, 2014 detailing the regulatory issues and potential violations. The project triggered a modification of Subpart OOOO for the entire plant. The project equipment as well as plant equipment subjected to Subpart OOOO was not monitored timely, and initial notification was not made timely. Settlement negotiations with WDEQ are currently ongoing.

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Long-term Debt

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Long-term Debt

The following table sets forth the outstanding borrowings, letters of credit issued, and available borrowing capacity under TEP's revolving credit facility as of March 31, 2015 and December 31, 2014:

	March 31, 2015			December 31, 2014
	(in thousands)
Total capacity under the revolving credit facility	$	850,000		$	850,000
Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
Available capacity under the revolving credit facility	$	152,000		$	291,000

The revolving credit facility contains various covenants and restrictive provisions that, among other things, limit or restrict TEP’s ability (as well as the ability of TEP’s restricted subsidiaries) to incur or guarantee additional debt, incur certain liens on assets, dispose of assets, make certain distributions (including distributions from available cash, if a default or event of default under the credit agreement then exists or would result from making such a distribution), change the nature of TEP’s business, engage in certain mergers or make certain investments and acquisitions, enter into non-arms-length transactions with affiliates and designate certain subsidiaries as "Unrestricted Subsidiaries." In addition, TEP is required to maintain a consolidated leverage ratio of not more than 4.75 to 1.00 (which will be increased to 5.25 to 1.00 for certain measurement periods following the consummation of certain acquisitions) and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2015, TEP is in compliance with the covenants required under the revolving credit facility.

The unused portion of the revolving credit facility is subject to a commitment fee, which ranges from 0.300% to 0.500%, based on TEP’s total leverage ratio. As of March 31, 2015, the weighted average interest rate on outstanding borrowings was 2.20%.

Fair Value

The following table sets forth the carrying amount and fair value of TEP’s long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, but for which fair value is disclosed:

	Fair Value
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total		Carrying Amount
	(in thousands)
March 31, 2015	$	—	$	698,000	$	—	$	698,000	$	698,000
December 31, 2014	$	—	$	559,000	$	—	$	559,000	$	559,000

The long-term debt borrowed under the revolving credit facility is carried at amortized cost. As of March 31, 2015 and December 31, 2014, the fair value approximates the carrying amount for the borrowings under the revolving credit facility using a discounted cash flow analysis. TEP is not aware of any factors that would significantly affect the estimated fair value subsequent to March 31, 2015.

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Reporting Segments - Summary of TEP's Segment Information of Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Segment assets	$ 2,453,551		$ 2,457,197
Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Segment assets	719,510		716,106
Crude Oil Transportation and Logistics
Segment Reporting Information [Line Items]
Segment assets	1,391,417		1,394,793
Processing & Logistics
Segment Reporting Information [Line Items]
Segment assets	337,303		340,620
Corporate and Other
Segment Reporting Information [Line Items]
Segment assets	5,321		5,678
TEP
Segment Reporting Information [Line Items]
Capital expenditures	13,300	209,111
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	3,865	9,626
TEP | Crude Oil Transportation and Logistics
Segment Reporting Information [Line Items]
Capital expenditures	6,480	196,437
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	2,955	3,048
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Capital expenditures	$ 0	$ 0

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Property, Plant and Equipment

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

A summary of net property, plant and equipment by classification is as follows:

	March 31, 2015			December 31, 2014
	(in thousands)
Crude oil pipelines	$	961,288		$	939,536
Natural gas pipelines	553,425			548,482
Processing and treating assets	237,049			241,671
General and other	52,666			42,719
Construction work in progress	194,638			139,873
Accumulated depreciation and amortization	(77,390		)	(59,200		)
Total property, plant and equipment, net	$	1,921,676		$	1,853,081

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Risk Management

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Risk Management

TEP occasionally enters into derivative contracts with third parties for the purpose of hedging exposures that accompany their normal business activities. TEP’s normal business activities directly and indirectly expose them to risks associated with changes in the market price of crude oil and natural gas, among other commodities. Specifically, the risks associated with changes in the market price of natural gas include, among others (i) pre-existing or anticipated physical natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. TEP has elected not to apply hedge accounting and changes in the fair value of all derivative contracts are recorded in earnings in the period in which the change occurs.

Fair Value of Derivative Contracts

The following table summarizes the fair values of TEP’s derivative contracts included in the condensed consolidated balance sheets:

	Balance Sheet Location	March 31, 2015		December 31, 2014
		(in thousands)
Energy commodity derivative contracts	Current assets	$	90	$	—

As of March 31, 2015, the fair value shown for commodity contracts was comprised of derivative volumes for short natural gas fixed-price swaps totaling 0.9 Bcf. As of December 31, 2014 there were no derivative contracts outstanding.

Effect of Derivative Contracts in the Statements of Income

The following table summarizes the impact of derivative contracts for the three months ended March 31, 2015 and 2014:

		Amount of gain (loss) recognized in income on derivatives
	Location of gain (loss) recognized in income on derivatives	Three Months Ended March 31,
		2015		2014
		(in thousands)
Derivatives not designated as hedging contracts:
Energy commodity derivative contracts	Natural gas sales	$	90	$	(351	)

Credit Risk

TEP has counterparty credit risk as a result of its use of derivative contracts. TEP’s counterparties consist of major financial institutions. This concentration of counterparties may impact TEP’s overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions.

TEP maintains credit policies that it believes minimize its overall credit risk. These policies include (i) evaluation of potential counterparties’ financial condition (including credit ratings), (ii) collateral requirements under certain circumstances and (iii) the use of standardized agreements which allow for netting of positive and negative exposure associated with a single counterparty. Based on its policies and exposure, TEP’s management does not currently anticipate a material adverse effect on TEP’s financial position, results of operations, or cash flows as a result of counterparty performance.

TEP’s over-the-counter swaps are entered into with counterparties outside central trading organizations such as a futures, options or stock exchange. These contracts are with financial institutions with investment grade credit ratings. While TEP enters into derivative transactions principally with investment grade counterparties and actively monitors their credit ratings, it is nevertheless possible that from time to time losses will result from counterparty credit risk in the future. The maximum potential exposure to credit losses on TEP’s derivative contracts at March 31, 2015 was:

	Asset Position
	(in thousands)
Gross	$	90
Netting agreement impact	—
Cash collateral held	—
Net Exposure	$	90

In addition, when the market value of TEP’s derivative contracts with specific counterparties exceeds established limits, TEP is required to provide collateral to its counterparties, which may include posting letters of credit or placing cash in margin accounts. Accordingly, entity valuation adjustments are necessary to reflect the effect of TEP’s own credit quality on the fair value of TEP’s net liability position with each counterparty. The methodology to determine this adjustment is consistent with how TEP evaluates counterparty credit risk, taking into account current credit spreads for its comparative industry sector, as well as any change in such spreads since the last measurement date. As of March 31, 2015 and December 31, 2014, TEP did not have any outstanding letters of credit or cash in margin accounts in support of its hedging of commodity price risks associated with the sale of natural gas nor did TEP have margin deposits with counterparties associated with energy commodity contract positions.

Fair Value

Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). Exchange-traded derivative contracts typically fall within Level 1 of the fair value hierarchy if they are traded in an active market. TEP values exchange-traded derivative contracts using quoted market prices for identical securities.

OTC derivatives are valued using models utilizing a variety of inputs including contractual terms and commodity and interest rate curves. The selection of a particular model and particular inputs to value an OTC derivative contract depends upon the contractual terms of the instrument as well as the availability of pricing information in the market. TEP uses similar models to value similar instruments. For OTC derivative contracts that trade in liquid markets, such as generic forwards and swaps, model inputs can generally be verified and model selection does not involve significant management judgment. Such contracts are typically classified within Level 2 of the fair value hierarchy.

Certain OTC derivative contracts trade in less liquid markets with limited pricing information; as such, the determination of fair value for these derivative contracts is inherently more difficult. Such contracts are classified within Level 3 of the fair value hierarchy. The valuations of these less liquid OTC derivatives are typically impacted by Level 1 and/or Level 2 inputs that can be observed in the market, as well as unobservable Level 3 inputs. Use of a different valuation model or different valuation input values could produce a significantly different estimate of fair value. However, derivative contracts valued using inputs unobservable in active markets are generally not material to TEP’s financial statements.

When appropriate, valuations are adjusted for various factors including credit considerations. Such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate is used.

The following table summarizes the fair value measurements of TEP’s energy commodity derivative contracts as of March 31, 2015 based on the fair value hierarchy established by the Codification:

			Asset fair value measurements using
	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(in thousands)
TEP as of March 31, 2015
Energy commodity derivative contracts	$	90	$	—	$	90	$	—

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Partnership Equity and Distributions

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Partnership Equity and Distributions

February Public Offering

On February 27, 2015, TEP sold 10,000,000 common units representing limited partner interests in an underwritten public offering at a price of $50.82 per unit, or $49.29 per unit net of the underwriter's discount, for net proceeds of approximately $492.6 million after deducting the underwriter's discount and offering expenses paid by TEP. TEP used the net proceeds from the offering to fund a portion of the consideration for the acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions. Pursuant to the underwriters' option to purchase additional units, TEP sold an additional 1,200,000 common units representing limited partner interests to the underwriters at a price of $50.82 per unit, or $49.29 per unit net of the underwriter’s discount, for net proceeds of approximately $59.3 million after deducting the underwriter’s discount and offering expenses paid by TEP. TEP used the net proceeds from this additional purchase of common units to reduce borrowings under its revolving credit facility, a portion of which were used to fund the March 2015 acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions.

Distributions to Holders of Common Units, Subordinated Units, General Partner Units and Incentive Distribution Rights

TEP’s partnership agreement requires TEP to distribute its available cash, as defined below, to unitholders of record on the applicable record date within 45 days after the end of each quarter, beginning with the quarter ended June 30, 2013. TEP’s partnership agreement provides that available cash, each quarter, is first distributed to the common unitholders and the general partner on a pro rata basis until each common unitholder has received $0.2875 per unit, which amount is defined in TEP’s partnership agreement as the minimum quarterly distribution ("MQD").

The following table shows the distributions for the periods indicated:

		Distributions
		Limited Partners Common and Subordinated Units		General Partner						Distributions per Limited Partner Unit
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2015	May 14, 2015 (1)	$	31,322	$	6,934	$	530	$	38,786	$	0.5200
December 31, 2014	February 13, 2015	23,782		4,039		473		28,294		0.4850
September 30, 2014	November 14, 2014	20,092		1,208		363		21,663		0.4100
June 30, 2014	August 14, 2014	18,596		758		330		19,684		0.3800
March 31, 2014	May 14, 2014	13,288		126		274		13,688		0.3250

⁽¹⁾  The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

Subordinated Units

Under the terms of TEP's partnership agreement and upon the payment of the quarterly cash distribution to unitholders on February 13, 2015, the subordination period ended. As a result, the 16,200,000 subordinated units held by TD converted into common units on a one for one basis on February 17, 2015. The conversion of the subordinated units did not impact the aggregate amount of cash distributions paid.

General Partner Units

As of March 31, 2015, the general partner owns an approximate 1.4% general partner interest in TEP, represented by 834,391 general partner units. Under TEP’s partnership agreement, the general partner may at any time (but is under no obligation to) contribute additional capital to TEP in order to maintain or attain a 2% general partner interest.

Incentive Distribution Rights

The general partner also owns all of the IDRs. IDRs represent the right to receive an increasing percentage (13%, 23% and 48%) of quarterly distributions of available cash from operating surplus after the MQD and the target distribution levels have been achieved. The general partner may transfer these rights separately from its general partner interest, subject to restrictions in TEP’s partnership agreement.

The following discussion related to incentive distributions assumes that TEP’s general partner holds a 2% general partner interest and continues to own all of the IDRs.

If for any quarter:

• TEP has distributed available cash from operating surplus to all of the common unitholders (and during the subordination period, to the subordinated unitholders) in an amount equal to the MQD for each outstanding unit for such quarter; and

• TEP has distributed available cash from operating surplus on outstanding common units in an amount necessary to eliminate any cumulative arrearages in the payment of the MQD to common unitholders;

then, TEP will distribute additional available cash from operating surplus for that quarter among the unitholders and the general partner in the following manner:

• first, 98% to all unitholders, pro rata, and 2% to TEP’s general partner, until each unitholder receives a total of $0.3048 per unit for that quarter (the "first target distribution");

• second, 85% to all unitholders, pro rata, and 15% to TEP’s general partner, until each unitholder receives a total of $0.3536 per unit for that quarter (the "second target distribution");

• third, 75% to all unitholders, pro rata, and 25% to TEP’s general partner, until each unitholder receives a total of $0.4313 per unit for that quarter (the "third target distribution"); and

• thereafter, 50% to all unitholders, pro rata, and 50% to TEP’s general partner.

Definition of Available Cash

Available cash generally means, for any quarter, all cash and cash equivalents on hand at the end of that quarter:

• less, the amount of cash reserves established by TEP’s general partner to:

▪ provide for the proper conduct of TEP’s business (including reserves for future capital expenditures, for anticipated future credit needs subsequent to that quarter, for legal matters and for refunds of collected rates reasonably likely to be refunded as a result of a settlement or hearing related to FERC rate proceedings);

▪ comply with applicable law or regulation, or any of TEP’s debt instruments or other agreements; or

▪ provide funds for distributions to unitholders and to TEP’s general partner for any one or more of the next four quarters (provided that TEP’s general partner may not establish cash reserves for distributions if the effect of the establishment of such reserves will prevent TEP from distributing the MQD on all common units and any cumulative arrearages on such common units for the current quarter);

• plus, if TEP’s general partner so determines, all or any portion of the cash on hand on the date of distribution of available cash for the quarter, including cash on hand resulting from working capital borrowings made subsequent to the end of such quarter.

Other Contributions and Distributions

During the three months ended March 31, 2015, TEP was deemed to have made a noncash capital distribution of $324.3 million to the general partner, which represents the excess purchase price over the carrying value of the additional 33.3% membership interest in Pony Express acquired effective March 1, 2015. See Note 4 - Acquisitions for additional information regarding the transaction.

During the three months ended March 31, 2014, the Trailblazer Predecessor and Pony Express Predecessor recognized net contributions from TD of $195.3 million.

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Summary of Significant Accounting Policies Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Mar. 31, 2015
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%	33.30%
Equity interest held by noncontrolling interests				33.30%
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%		33.30%	66.70%
Preferred Membership, Percentage Acquired	100.00%		33.30%
Minimum Quarterly Distribution Required by Partnership Agreement	16.65		$ 36.65
Minimum Monthly Distribution Required by Partnership Agreement	5.4		$ 23.5

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Long-term Debt - Carrying Amount and Fair Value of TEP's Long-term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Fair Value	$ 698,000	$ 559,000
Carrying Amount	698,000	559,000
Quoted prices in active markets for identical assets (Level 1) [Member]
Debt Instrument [Line Items]
Fair Value	0	0
Significant other observable inputs (Level 2) [Member]
Debt Instrument [Line Items]
Fair Value	698,000	559,000
Significant unobservable inputs (Level 3) [Member]
Debt Instrument [Line Items]
Fair Value	$ 0	$ 0

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Subsequent Events

3 Months Ended

Mar. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

Trailblazer Fuel Tracker Filing

On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. See Note 12 - Regulatory Matters for details.

Tallgrass Energy GP, LP Initial Public Offering

On May 6, 2015, Tallgrass Energy GP, LP (“TEGP”), a newly formed entity that is expected to own, directly or indirectly, all of TEP’s incentive distribution rights, TEP’s general partner interest, and 20,000,000 common units representing limited partner interests in TEP, announced the pricing of its initial public offering of 41,500,000 Class A shares representing limited partner interests in TEGP at $29.00 per Class A share. TEGP granted the underwriters an option to purchase up to an additional 6,225,000 Class A shares, which was exercised on May 7, 2015. TEGP anticipates closing its initial public offering on May 12, 2015.

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Inventory (Tables)

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Schedule of Components of Inventory

The components of inventory at March 31, 2015 and December 31, 2014 consisted of the following:

	March 31, 2015		December 31, 2014
	(in thousands)
Gas in underground storage	$	6,055	$	8,896
Materials and supplies	4,600		3,049
Crude oil	1,592		581
Natural gas liquids	432		519
Total inventory	$	12,679	$	13,045

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Long-term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Oct. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Weighted average interest rate on outstanding borrowings		2.20%
Senior Revolving Credit Facility [Member] | Barclays Bank [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		850,000	$ 850,000
Maximum [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	5.25	4.75
Credit facility commitment fee		0.50%
Minimum [Member]
Debt Instrument [Line Items]
Consolidated interest coverage ratio		2.50
Credit facility commitment fee		0.30%

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Related Party Transactions - Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$ 0	$ 73,393
Accounts Payable, Related Parties, Current	3,000	3,915
Total payables to affiliated companies	3,000	3,915
Tallgrass Operations, LLC [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	0	73,393
Accounts Payable, Related Parties, Current	2,980	3,894
Rockies Express Pipeline LLC [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	11	21
Deeprock Development, LLC [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	$ 9	$ 0

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 22,990	$ 16,617
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	21,557	8,638
Noncash compensation expense	1,527	941
Loss on sale of assets	4,483	0
Changes in components of working capital:
Accounts receivable and other	(5,678)	1,356
Gas imbalances	143	321
Inventories	(2,754)	(887)
Accounts payable and accrued liabilities	6,546	(6,623)
Other operating, net	(175)	7,240
Net Cash Provided by Operating Activities	(48,639)	(27,603)
Cash Flows from Investing Activities:
Capital expenditures	(13,300)	(209,111)
Acquisition of additional 33.3% membership interest in Pony Express	(700,000)	0
Other investing, net	(311)	(1,910)
Net Cash Used in Investing Activities	713,611	211,021
Net Cash Provided by Financing Activities
Proceeds from public offerings, net of offering costs	551,949	0
Borrowings under revolving credit facility, net	139,000	0
Contributions from Predecessor Member, net	0	195,299
Distributions to unitholders	(28,294)	(13,082)
Other financing, net	2,326	1,201
Net Cash Provided by Financing Activities	664,981	183,418
Net Change in Cash and Cash Equivalents
Net Change in Cash and Cash Equivalents	9	0
Cash and Cash Equivalents, beginning of period	867	0
Cash and Cash Equivalents, end of period	876	0
Supplemental Disclosures:
Property, plant and equipment acquired via the cash management agreement with TD	72,407	0
Increase in accrual for payment of property, plant and equipment	$ 1,179	$ 53,542

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Acquisitions

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Acquisitions

TEP Acquisition of Trailblazer

On April 1, 2014, TEP closed the acquisition of Trailblazer from a wholly owned subsidiary of TD for total consideration valued at approximately $164 million, consisting of $150 million in cash and the issuance of 385,140 common units (valued at approximately $14 million based on the March 31, 2014 closing price of TEP’s common units). On that same date, the general partner contributed additional capital in the amount of approximately $263,000 in exchange for the issuance of 7,860 general partner units in order to maintain its 2% general partner interest. The acquisition of Trailblazer represents a change in reporting entity and a transaction between entities under common control. The excess purchase price over the net book value of Trailblazer's assets and liabilities was accounted for as a deemed distribution as discussed further in Note 10 – Partnership Equity and Distributions.

TEP Acquisitions of 66.7% of Pony Express

Effective September 1, 2014, TEP acquired a controlling 33.3% membership interest in Pony Express for total consideration of approximately $600 million. At closing, Pony Express, TD, and TEP entered into a Second Amended and Restated Limited Liability Company Agreement of Pony Express effective September 1, 2014, which sets forth the relative rights of TD and TEP as the owners of Pony Express. Of the total consideration of $600 million, TEP directly paid TD $30 million, consisting of $27 million in cash and 70,340 TEP common units with an aggregate fair value of approximately $3 million, in exchange for the transfer by TD to TEP of a 1.9585% membership interest in Pony Express (computed before giving effect to the issuance of the new membership interest by Pony Express to TEP). TEP also contributed cash of $570 million to Pony Express in exchange for a newly issued membership interest which, when combined with the membership interest transferred from TD and the parties' entry at closing into the Second Amended and Restated Limited Liability Company Agreement of Pony Express, constituted TEP's 33.3% membership interest in Pony Express, which represented 100% of the preferred membership units issued by Pony Express. Of the $570 million cash consideration received by Pony Express, $300 million was immediately distributed to TD at closing and $270 million was retained by Pony Express to fund the estimated remaining costs of construction for the Pony Express System and the lateral in Northeast Colorado. The $270 million cash balance was subsequently swept to TD under a cash management agreement between Pony Express and TD and was recorded as a related party loan which bears interest at TD's incremental borrowing rate. There was no remaining balance outstanding on the related party loan at March 31, 2015.

The terms of TEP's first acquisition of a 33.3% membership interest in Pony Express provided TEP a minimum quarterly preference payment of $16.65 million through the quarter ending September 30, 2015 (prorated to approximately $5.4 million for the quarter ended September 30, 2014) with distributions thereafter shared in accordance with the terms of the Second Amended Pony Express LLC Agreement. At the effective date of that transaction, TEP determined that Pony Express was a VIE of which TEP was the primary beneficiary, and consolidated Pony Express accordingly. For additional discussion and disclosure, see Note 3 – Variable Interest Entities. The acquisition of the initial 33.3% membership interest in Pony Express represented a transaction between entities under common control and a change in reporting entity.

Effective March 1, 2015, TEP acquired an additional 33.3% membership interest in Pony Express for cash consideration of approximately $700 million. At closing, Pony Express, TD, and TEP entered into the Pony Express LLC Agreement effective March 1, 2015, which sets forth the relative rights of TD and TEP as the owners of Pony Express. The terms of the transaction increased the minimum quarterly preference payment provided to TEP to $36.65 million through the quarter ending December 31, 2015 (prorated to approximately $23.5 million for the quarter ended March 31, 2015) with distributions thereafter shared in accordance with the terms of the Pony Express LLC Agreement.

Upon the effective date of the transaction, TEP reevaluated its VIE assessment and determined that Pony Express continues to be considered a VIE of which TEP is the primary beneficiary. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to the transaction have not been recast to reflect the additional 33.3% membership interest.

Historical Financial Information

The results of our acquisitions of Trailblazer and 66.7% membership interest in Pony Express are included in the condensed consolidated balance sheet as of March 31, 2015. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated balance sheet as of December 31, 2014. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income for the three months ended March 31, 2015 and 2014. The results of our acquisition of an additional 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income prospectively beginning March 1, 2015.

The following tables present the previously reported condensed consolidated statements of income for the three months ended March 31, 2014, adjusted for the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express:

	Three Months Ended March 31, 2014
	TEP			Consolidate Trailblazer Pipeline Company LLC		Consolidate Tallgrass Pony Express Pipeline, LLC			TEP (As currently reported)
	(in thousands)
Revenues:
Natural gas liquids sales	$	48,907		$	—	$	—		$	48,907
Natural gas sales	2,196			2,612		—			4,808
Transportation services	27,051			7,053		—			34,104
Processing and other revenues	6,808			152		—			6,960
Total Revenues	84,962			9,817		—			94,779
Operating Costs and Expenses:
Cost of sales	45,543			2,663		—			48,206
Cost of transportation services	4,903			214		—			5,117
Operations and maintenance	7,286			727		—			8,013
Depreciation and amortization	6,514			1,038		757			8,309
General and administrative	6,201			448		—			6,649
Taxes, other than income taxes	1,456			500		—			1,956
Total Operating Costs and Expenses	71,903			5,590		757			78,250
Operating Income (Loss)	13,059			4,227		(757		)	16,529
Other (Expense) Income:
Interest (expense) income, net	(1,324		)	31		(3		)	(1,296		)
Equity in earnings of unconsolidated investment	444			—		—			444
Other income, net	721			219		—			940
Total Other (Expense) Income	(159		)	250		(3		)	88
Net Income (Loss)	12,900			4,477		(760		)	16,617
Net loss attributable to noncontrolling interests	—			—		507			507
Net income (loss) attributable to partners	$	12,900		$	4,477	$	(253	)	$	17,124

Formation of BNN Water Solutions, LLC

On November 26, 2013, TEP, through its wholly-owned subsidiary Tallgrass Energy Investments, LLC ("TEI"), entered into a joint venture agreement with BNN Energy LLC ("BNN") to form Grasslands Water Services I, LLC ("GWSI"). GWSI subsequently built and began operating an intrastate water pipeline in Colorado. TEP accounted for its 50% equity interest in GWSI as an equity method investment. On May 13, 2014, TEI entered into a contribution agreement with BNN and several other parties to form a new entity known as BNN Water Solutions, LLC ("Water Solutions"). Under the terms of the contribution agreement, TEI agreed to contribute its existing 50% interest in GWSI, along with $7.6 million cash, in exchange for an 80% membership interest in Water Solutions. As part of the transaction, GWSI was renamed BNN Redtail, LLC ("Redtail"), became a subsidiary of Water Solutions, and issued preferred equity interests to TEI. Among the assets contributed by BNN and the other parties to the transaction were the other 50% interest in Redtail and a 100% equity interest in Alpha Reclaim Technology, LLC ("Alpha"), a company which sources treated wastewater from municipalities in Texas. Alpha is wholly-owned by Redtail.

Upon closing of the transaction, TEP obtained a controlling financial interest in Water Solutions and accordingly has accounted for the transaction as a step acquisition under ASC 805. On the acquisition date, TEP remeasured its previously held 50% equity interest in Redtail to its fair value of $11.9 million, recognized a gain of $9.4 million, and consolidated Water Solutions. The 20% equity interest in Water Solutions held by noncontrolling interests was recorded at its acquisition date fair value of $1.4 million. The fair values of the previously held equity interest and the noncontrolling interest were determined using a discounted cash flow analysis. These fair value measurements are based on significant inputs that are not observable in the market and thus represent fair value measurements categorized within Level 3 of the fair value hierarchy under ASC 820.

At March 31, 2015, the assets acquired and liabilities assumed in the acquisition were recorded at provisional amounts based on the preliminary purchase price allocation. TEP is in the process of obtaining additional information to identify and measure all assets acquired and liabilities assumed in the acquisition within the measurement period. Such provisional amounts will be adjusted if necessary to reflect any new information about facts and circumstances that existed at the acquisition date that, if known, would have affected the measurement of these amounts.

Pro forma revenue and net income attributable to TEP for the three months ended March 31, 2014 was $96.7 million and $17.4 million, respectively. This unaudited pro forma financial information for TEP is presented as if the acquisition of Water Solutions had been completed on January 1, 2014. The pro forma financial information is not necessarily indicative of what the actual results of operations or financial position of TEP would have been if the transactions had in fact occurred on the date or for the period indicated, nor do they purport to project the results of operations or financial position of TEP for any future periods or as of any date. The pro forma financial information does not give effect to any cost savings, operating synergies, or revenue enhancements expected to result from the transactions or the costs to achieve these cost savings, operating synergies, and revenue enhancements. The pro forma revenue and net income includes adjustments for the three months ended March 31, 2014 to give effect to the following:

(a) Reduction in net income attributable to TEP to remove equity in earnings of GWSI recorded for the period from January 1, 2014 to March 31, 2014.

(b) Increase in revenue and net income attributable to TEP to reflect TEP's consolidated 80% interest in the operations of GWSI for the period from January 1, 2014 to March 31, 2014.

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Reporting Segments - Summary of TEP's Segment Information of Revenue (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 114,675	$ 94,779
TEP
Segment Reporting Information [Line Items]
Revenues	114,675	94,779
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	32,264	38,376
TEP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	50,381	0
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	32,030	56,403
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Operating Segments
Segment Reporting Information [Line Items]
Revenues	116,021	96,034
TEP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	33,610	39,631
TEP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	50,381	0
TEP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	32,030	56,403
TEP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment
Segment Reporting Information [Line Items]
Revenues	(1,346)	(1,255)
TEP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	(1,346)	(1,255)
TEP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0

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Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Components of Property Plant and Equipment

A summary of net property, plant and equipment by classification is as follows:

	March 31, 2015			December 31, 2014
	(in thousands)
Crude oil pipelines	$	961,288		$	939,536
Natural gas pipelines	553,425			548,482
Processing and treating assets	237,049			241,671
General and other	52,666			42,719
Construction work in progress	194,638			139,873
Accumulated depreciation and amortization	(77,390		)	(59,200		)
Total property, plant and equipment, net	$	1,921,676		$	1,853,081

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Acquisitions Impact of Acquisition, Income Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Natural gas liquids sales	$ 21,025	$ 48,907
Natural gas sales	844	4,808
Natural gas transportation services	32,148	34,104
Processing and other revenues	10,277	6,960
Total Revenues	114,675	94,779
Cost of sales (exclusive of depreciation and amortization shown below)	19,593	48,206
Cost of transportation services	10,715	5,117
Operations and maintenance	9,575	8,013
Depreciation and amortization	20,605	8,309
General and administrative	12,689	6,649
Taxes, other than income taxes	11,297	1,956
Total Operating Costs and Expenses	88,957	78,250
Operating Income	25,718	16,529
Interest expense, net	(3,440)	(1,296)
Equity in earnings of unconsolidated investment	0	444
Other Nonoperating Income (Expense)	712	940
Total Other (Expense) Income	(2,728)	88
Net income	22,990	16,617
Net Income (Loss) Attributable to Noncontrolling Interest	9,329	507
Net income attributable to partners	32,319	17,124
Tallgrass Energy Partners [Member]
Business Acquisition [Line Items]
Natural gas liquids sales		48,907
Natural gas sales		2,196
Natural gas transportation services		27,051
Processing and other revenues		6,808
Total Revenues		84,962
Cost of sales (exclusive of depreciation and amortization shown below)		45,543
Cost of transportation services		4,903
Operations and maintenance		7,286
Depreciation and amortization		6,514
General and administrative		6,201
Taxes, other than income taxes		1,456
Total Operating Costs and Expenses		71,903
Operating Income		13,059
Interest expense, net		(1,324)
Equity in earnings of unconsolidated investment		444
Other Nonoperating Income (Expense)		721
Total Other (Expense) Income		(159)
Net income		12,900
Net Income (Loss) Attributable to Noncontrolling Interest		0
Net income attributable to partners		12,900
Trailblazer
Business Acquisition [Line Items]
Natural gas liquids sales		0
Natural gas sales		2,612
Natural gas transportation services		7,053
Processing and other revenues		152
Total Revenues		9,817
Cost of sales (exclusive of depreciation and amortization shown below)		2,663
Cost of transportation services		214
Operations and maintenance		727
Depreciation and amortization		1,038
General and administrative		448
Taxes, other than income taxes		500
Total Operating Costs and Expenses		5,590
Operating Income		4,227
Interest expense, net		31
Equity in earnings of unconsolidated investment		0
Other Nonoperating Income (Expense)		219
Total Other (Expense) Income		250
Net income		4,477
Net Income (Loss) Attributable to Noncontrolling Interest		0
Net income attributable to partners		4,477
Pony Express Pipeline
Business Acquisition [Line Items]
Natural gas liquids sales		0
Natural gas sales		0
Natural gas transportation services		0
Processing and other revenues		0
Total Revenues		0
Cost of sales (exclusive of depreciation and amortization shown below)		0
Cost of transportation services		0
Operations and maintenance		0
Depreciation and amortization		757
General and administrative		0
Taxes, other than income taxes		0
Total Operating Costs and Expenses		757
Operating Income		(757)
Interest expense, net		(3)
Equity in earnings of unconsolidated investment		0
Other Nonoperating Income (Expense)		0
Total Other (Expense) Income		(3)
Net income		(760)
Net Income (Loss) Attributable to Noncontrolling Interest		507
Net income attributable to partners		$ (253)

XML

Reporting Segments

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Reporting Segments

TEP’s operations are located in the United States. TEP is organized into three reporting segments: (1) Natural Gas Transportation & Logistics, (2) Crude Oil Transportation & Logistics, and (3) Processing & Logistics.

Natural Gas Transportation & Logistics

The Natural Gas Transportation & Logistics segment is engaged in ownership and operation of FERC-regulated interstate natural gas pipelines and integrated natural gas storage facilities that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. As discussed in Note 2–Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Trailblazer.

Crude Oil Transportation & Logistics

The Crude Oil Transportation & Logistics segment is engaged in ownership, construction, and operation of a FERC-regulated crude oil pipeline to serve the Bakken Shale and other nearby oil producing basins. The Pony Express System was placed in service in October 2014. The Crude Oil Transportation & Logistics segment also includes the construction of a lateral pipeline in Northeast Colorado, which will interconnect with the Pony Express System just east of Sterling, Colorado and is expected to be placed in service during the first half of 2015. As discussed in Note 2–Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Pony Express.

Processing & Logistics

The Processing & Logistics segment is engaged in ownership and operation of natural gas processing, treating and fractionation facilities that produce NGLs and residue gas that is sold in local wholesale markets or delivered into pipelines for transportation to additional end markets, as well as water business services provided primarily to the oil and gas exploration and production industry.

Corporate and Other

Corporate and Other includes corporate overhead costs that are not directly associated with the operations of TEP’s reportable segments, such as interest and fees associated with TEP’s revolving credit facility, public company costs reimbursed to TD, and equity-based compensation expense.

These segments are monitored separately by management for performance and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for their respective operations.

TEP considers Adjusted EBITDA as its primary segment performance measure as TEP believes it is the most meaningful measure to assess TEP’s financial condition and results of operations as a public entity. Adjusted EBITDA, a non-GAAP measure, is defined as net income excluding the impact of interest, income taxes, depreciation and amortization, non-cash income or loss related to derivative instruments, non-cash long-term compensation expense, impairment losses, gains or losses on asset or business disposals or acquisitions, gains or losses on the repurchase, redemption or early retirement of debt, and earnings from unconsolidated investments, but including the impact of distributions from unconsolidated investments.

The following tables set forth TEP’s segment information for the periods indicated:

	Three Months Ended March 31, 2015							Three Months Ended March 31, 2014
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
			(in thousands)							(in thousands)
Natural Gas Transportation & Logistics	$	33,610	$	(1,346	)	$	32,264	$	39,631	$	(1,255	)	$	38,376
Crude Oil Transportation & Logistics	50,381		—			50,381		—		—			—
Processing & Logistics	32,030		—			32,030		56,403		—			56,403
Corporate and Other	—		—			—		—		—			—
Total revenue	$	116,021	$	(1,346	)	$	114,675	$	96,034	$	(1,255	)	$	94,779

	Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
Adjusted EBITDA:	Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA			Total Adjusted EBITDA			Inter- Segment			External Adjusted EBITDA
	(in thousands)									(in thousands)
Natural Gas Transportation & Logistics	$	19,246		$	(1,346	)	$	17,900		$	19,862		$	(1,255	)	$	18,607
Crude Oil Transportation & Logistics	25,506			1,346			26,852			—			—			—
Processing & Logistics	8,718			—			8,718			9,596			—			9,596
Corporate and Other	(635		)	—			(635		)	(625		)	—			(625		)
Reconciliation to Net Income:
Interest expense, net							3,440									1,294
Depreciation and amortization expense, net of noncontrolling interest							20,533									7,804
Non-cash loss from asset sales							4,483									—
Non-cash (gain) loss related to derivative instruments							(90		)							351
Non-cash compensation expense							1,527									941
Distributions from unconsolidated investment							—									508
Equity in earnings of unconsolidated investment							—									(444		)
Non-cash loss allocated to noncontrolling interest							(9,377		)							—
Net Income attributable to partners							$	32,319								$	17,124

	Three Months Ended March 31,
Capital Expenditures:	2015		2014
			(in thousands)
Natural Gas Transportation & Logistics	$	3,865	$	9,626
Crude Oil Transportation & Logistics	6,480		196,437
Processing & Logistics	2,955		3,048
Corporate and Other	—		—
Total capital expenditures	$	13,300	$	209,111

Assets:	March 31, 2015		December 31, 2014
	(in thousands)
Natural Gas Transportation & Logistics	$	719,510	$	716,106
Crude Oil Transportation & Logistics	1,391,417		1,394,793
Processing & Logistics	337,303		340,620
Corporate and Other	5,321		5,678
Total assets	$	2,453,551	$	2,457,197