10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the Quarterly Period Ended March 31, 2018

or

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

Commission file number 001-37365

Tallgrass Energy GP, LP

(Exact name of registrant as specified in its charter)

Delaware	46-3159268
(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  x    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  x    No  ¨

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

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

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

On May 3, 2018, the Registrant had 58,085,002 Class A shares and 126,709,225 Class B shares outstanding.

TALLGRASS ENERGY GP, 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 EQUITY	3
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS	4
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	6
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3. Quantitative and Qualitative Disclosures About Market Risk	44
Item 4. Controls and Procedures	45
PART II - OTHER INFORMATION	46
Item 1. Legal Proceedings	46
Item 1A. Risk Factors	46
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	46
Item 3. Defaults Upon Senior Securities	46
Item 4. Mine Safety Disclosures	46
Item 5. Other Information	46
Item 6. Exhibits	47
SIGNATURES	48

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.

Commodity sensitive contracts or arrangements: contracts or other arrangements, including tariff provisions, that are directly tied to increases and decreases in the price of commodities such as crude oil, natural gas and NGLs. Examples are Keep Whole Processing Contracts and Percent of Proceeds Processing Contracts, as well as pipeline loss allowances on our pipelines.

Condensate: an 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 firm service assurance of capacity and deliverability to delivery points.

Delivery point: any point at which product in a pipeline is delivered to or for the account of a customer.

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.

EPA: the United States Environmental Protection Agency.

FERC: the United States Federal Energy Regulatory Commission.

Firm fee contracts: contracts or other arrangements, including tariff provisions, that generally obligate our customers to pay a fixed recurring charge to reserve an agreed upon amount of capacity and/or deliverability on our assets, regardless if the contracted capacity is actually used by the customer. Such contracts are also commonly known as "take-or-pay" contracts.

Firm services: services pursuant to which customers receive firm assurances regarding the availability of capacity and/or deliverability of natural gas, crude oil or other hydrocarbons or water on our assets up to a contracted amount.

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

GAAP: accounting principles generally accepted 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.

Interruptible services: services pursuant to which customers receive limited, or no, assurances regarding the availability of capacity and deliverability in our assets.

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 end users within a specific geographic area.

Long-term: with respect to any contract, a contract with an initial duration greater than one year.

MMBtu: one million British Thermal Units.

Mcf: one thousand cubic feet.

MDth: one thousand dekatherms.

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, 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 (or walk-up 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.

NYSE: New York Stock 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.

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.

Produced water: all water removed from a well as a byproduct of the production of hydrocarbons and water removed from a well in connection with operations being conducted on the well, including naturally occurring water in the recovery formation, flow back water recovered during completion and fracturing operations and water entering the recovery formation through water flooding techniques.

Receipt point: the point where a product is received by or into a gathering system, processing facility, or transportation pipeline.

Reservoir: a porous and permeable underground formation containing an individual and separate natural accumulation of producible hydrocarbons (such as 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 transportation to end-user markets.

TBtu: one trillion British Thermal Units.

Tcf: one trillion cubic feet.

Throughput: the volume of products, such as crude oil, natural gas or water, transported or passing through a pipeline, plant, terminal or other facility during a particular period.

Uncommitted shippers (or walk-up shippers): customers 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.

Volumetric fee contracts: contracts or other arrangements, including tariff provisions, that generally obligate a customer to pay fees based upon the extent to which such customer utilizes our assets for midstream energy services. Unlike firm fee contracts, under volumetric fee contracts our customers are not generally required to pay a charge to reserve an agreed upon amount of capacity and/or deliverability.

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 GP, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	March 31, 2018		December 31, 2017
	(in thousands)
ASSETS
Current Assets:
Cash and cash equivalents	$	4,255	$	2,593
Accounts receivable, net	131,401		118,615
Receivable from related parties	4,472		1,340
Gas imbalances	822		1,990
Inventories	32,147		21,609
Derivative assets	306		—
Prepayments and other current assets	11,020		11,175
Total Current Assets	184,423		157,322
Property, plant and equipment, net	2,498,715		2,394,337
Goodwill	404,838		404,838
Intangible assets, net	136,554		97,731
Unconsolidated investments	1,446,039		909,531
Deferred financing costs, net	11,769		12,563
Deferred tax asset	306,304		312,997
Deferred charges and other assets	5,018		2,694
Total Assets	$	4,993,660	$	4,292,013
LIABILITIES AND EQUITY
Current Liabilities:
Accounts payable	$	121,372	$	98,882
Accounts payable to related parties	—		5,342
Gas imbalances	1,616		1,663
Derivative liabilities	—		2,368
Accrued taxes	24,181		19,272
Accrued liabilities	37,028		35,707
Deferred revenue	99,922		88,471
Other current liabilities	7,816		7,171
Total Current Liabilities	291,935		258,876
Long-term debt, net	2,426,014		2,292,993
Other long-term liabilities and deferred credits	19,628		18,965
Total Long-term Liabilities	2,445,642		2,311,958
Commitments and Contingencies
Equity:
Class A Shareholders (58,085,002 shares outstanding at March 31, 2018 and December 31, 2017)	15,615		48,613
Class B Shareholders (126,709,225 and 99,154,440 shares outstanding at March 31, 2018 and December 31, 2017, respectively)	—		—
Total Partners' Equity	15,615		48,613
Noncontrolling interests	2,240,468		1,672,566
Total Equity	2,256,083		1,721,179
Total Liabilities and Equity	$	4,993,660	$	4,292,013

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

1

TALLGRASS ENERGY GP, LP

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended March 31,
	2018			2017
	(in thousands, except per unit amounts)
Revenues:
Crude oil transportation services	$	84,738		$	84,331
Natural gas transportation services	32,196			31,685
Sales of natural gas, NGLs, and crude oil	38,145			15,381
Processing and other revenues	24,015			13,003
Total Revenues	179,094			144,400
Operating Costs and Expenses:
Cost of sales	26,351			12,370
Cost of transportation services	10,420			13,503
Operations and maintenance	16,399			12,903
Depreciation and amortization	26,123			21,403
General and administrative	18,426			14,217
Taxes, other than income taxes	8,879			8,226
Gain on disposal of assets	(9,417		)	(1,448		)
Total Operating Costs and Expenses	97,181			81,174
Operating Income	81,913			63,226
Other Income (Expense):
Equity in earnings of unconsolidated investments	68,402			20,738
Interest expense, net	(29,761		)	(16,017		)
Other income, net	451			1,955
Total Other Income (Expense)	39,092			6,676
Net income before tax	121,005			69,902
Deferred income tax expense	(6,692		)	(2,664		)
Net income	114,313			67,238
Net income attributable to noncontrolling interests	(97,578		)	(55,209		)
Net income attributable to TEGP	$	16,735		$	12,029
Allocation of income:
Net income attributable to TEGP	$	16,735		$	12,029
Basic net income per Class A share	$	0.29		$	0.21
Diluted net income per Class A share	$	0.29		$	0.21
Basic average number of Class A shares outstanding	58,085			58,075
Diluted average number of Class A shares outstanding	58,210			58,165

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

2

TALLGRASS ENERGY GP, LP

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(UNAUDITED)

	Predecessor Equity			Partners' Capital					Noncontrolling Interests			Total Equity
				Class A Shares			Class B Shares
	(in thousands)
Balance at January 1, 2018	$	—		$	48,613		$	—	$	1,672,566		$	1,721,179
Cumulative effect of ASC 606 implementation	—			4,588			—		39,543			44,131
Net income	—			16,735			—		97,578			114,313
Issuance of TEP units to the public, net of offering costs	—			(5		)	—		(40		)	(45		)
TEGP distributions to Class A shareholders	—			(21,346		)	—		—			(21,346		)
Noncash compensation expense	—			404			—		2,917			3,321
Acquisition of additional TEP common units from TD	—			(62,222		)	—		(189,520		)	(251,742		)
Issuance of Tallgrass Equity units	—			—			—		644,782			644,782
Acquisition of additional 2% membership interest in Pony Express	—			(5,268		)	—		(44,732		)	(50,000		)
Acquisition of 25.01% membership interest in Rockies Express	—			34,116			—		74,421			108,537
Consolidation of Deeprock North	—			—			—		31,843			31,843
Contributions from noncontrolling interest	—			—			—		183			183
Distributions to noncontrolling interest	—			—			—		(89,073		)	(89,073		)
Balance at March 31, 2018	$	—		$	15,615		$	—	$	2,240,468		$	2,256,083
	Predecessor Equity			Partners' Capital					Noncontrolling Interests			Total Equity
				Class A Shares			Class B Shares
	(in thousands)
Balance at January 1, 2017	$	82,295		$	250,967		$	—	$	1,596,152		$	1,929,414
Acquisition of Terminals and NatGas	(82,295		)	(21,314		)	—		(36,391		)	(140,000		)
Net income	—			12,029			—		55,209			67,238
Issuance of TEP units to the public, net of offering costs	—			10,020			—		89,353			99,373
TEGP distributions to Class A Shareholders	—			(16,116		)	—		—			(16,116		)
Noncash compensation expense	—			362			—		1,882			2,244
Issuance of common units under TEP LTIP plan	—			(40		)	—		(360		)	(400		)
Partial exercise of call option	—			(12,052		)	—		(72,890		)	(84,942		)
Repurchase of TEP common units from TD	—			(3,618		)	—		(31,717		)	(35,335		)
Acquisition of additional 24.99% membership interest in Rockies Express	—			23,522			—		40,159			63,681
Contributions from TD	—			850			—		1,451			2,301
Contributions from noncontrolling interest	—			—			—		710			710
Distributions to noncontrolling interest	—			—			—		(71,426		)	(71,426		)
Balance at March 31, 2017	$	—		$	244,610		$	—	$	1,572,132		$	1,816,742

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

3

TALLGRASS ENERGY GP, LP

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Cash Flows from Operating Activities:
Net income	$	114,313		$	67,238
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	27,620			23,694
Equity in earnings of unconsolidated investments	(68,402		)	(20,738		)
Distributions from unconsolidated investments	67,059			20,740
Deferred income tax expense	6,692			2,664
Gain on disposal of assets	(9,417		)	(1,448		)
Other noncash items, net	207			(1,621		)
Changes in components of working capital:
Accounts receivable and other	(12,013		)	2,449
Accounts payable and accrued liabilities	16,354			(6,055		)
Deferred revenue	10,750			16,202
Other current assets and liabilities	(1,671		)	(819		)
Other operating, net	108			(140		)
Net Cash Provided by Operating Activities	151,600			102,166
Cash Flows from Investing Activities:
Acquisition of BNN North Dakota, net of cash acquired	(95,000		)	—
Capital expenditures	(58,760		)	(26,769		)
Sale of Tallgrass Crude Gathering	50,046			—
Distributions from unconsolidated investments in excess of cumulative earnings	20,774			10,079
Acquisition of 38% membership interest in Deeprock North	(19,500		)	—
Acquisition of Rockies Express membership interest	—			(400,000		)
Acquisition of Terminals and NatGas	—			(140,000		)
Other investing, net	(20,473		)	(5,352		)
Net Cash Used in Investing Activities	(122,913		)	(562,042		)
Cash Flows from Financing Activities:
Borrowings under revolving credit facilities, net	133,000			552,000
Distributions to noncontrolling interests	(89,073		)	(71,426		)
Acquisition of Pony Express membership interest	(50,000		)	—
TEGP distributions to Class A shareholders	(21,346		)	(16,116		)
Proceeds from public offering of TEP common units, net of offering costs	—			99,373
Partial exercise of call option	—			(72,381		)
Repurchase of TEP common units from TD	—			(35,335		)
Other financing, net	394			3,355
Net Cash (Used in) Provided by Financing Activities	(27,025		)	459,470
Net Change in Cash and Cash Equivalents	1,662			(406		)
Cash and Cash Equivalents, beginning of period	2,593			2,459
Cash and Cash Equivalents, end of period	$	4,255		$	2,053

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

4

Schedule of Noncash Investing and Financing Activities:
Issuance of Tallgrass Equity units	$	644,782		$	—
Acquisition of Rockies Express membership interest	$	(393,039	)	$	—
Acquisition of additional TEP common units from TD	$	(251,743	)	$	—
Contribution of 38% membership interest in Deeprock North to Deeprock Development	$	(19,500	)	$	—
Issuance of noncontrolling interests in Deeprock Development in exchange for 62% membership interest in Deeprock North	$	(31,843	)	$	—
Increase in accrual for payment of property, plant and equipment	$	1,336		$	—

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

5

TALLGRASS ENERGY GP, LP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1. Description of Business

Tallgrass Energy GP, LP ("TEGP" or the "Partnership") is a limited partnership that has elected to be treated as a corporation for U.S. federal income tax purposes. "We," "us," "our" and similar terms refer to TEGP together with its consolidated subsidiaries. TEGP's sole cash-generating asset as of March 31, 2018 is an approximate 31.43% controlling membership interest in Tallgrass Equity, LLC ("Tallgrass Equity"). Tallgrass Equity's cash-generating assets consist of the direct and indirect partnership interests in Tallgrass Energy Partners, LP ("TEP") and its membership interest in Rockies Express Pipeline LLC ("Rockies Express") as described below:

• 100% of the outstanding membership interests in Tallgrass MLP GP, LLC ("TEP GP"), which owns the general partner interest in TEP as well as all the TEP incentive distribution rights ("IDRs"). The general partner interest in TEP is represented by 834,391 general partner units, representing an approximate 1.13% general partner interest in TEP at March 31, 2018.

• 25,619,218 TEP common units, representing an approximate 34.60% limited partner interest in TEP at March 31, 2018, inclusive of the 5,619,218 TEP common units acquired from Tallgrass Development, LP ("TD") as of February 7, 2018 as described below.

• As of February 7, 2018, TD merged into Tallgrass Development Holdings, LLC, a wholly-owned subsidiary of Tallgrass Equity ("Tallgrass Development Holdings"), and as a result of the merger, Tallgrass Equity acquired a 25.01% membership in Rockies Express and an additional 5,619,218 TEP common units. As consideration for the acquisition, TEGP and Tallgrass Equity issued 27,554,785 unregistered TEGP Class B shares and Tallgrass Equity units, valued at approximately $644.8 million, to the limited partners of TD.

TEP is a publicly traded, growth-oriented limited partnership formed to own, operate, acquire and develop midstream energy assets in North America. TEP's operations are 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, Bakken, Marcellus, and Utica shale formations.

Our reportable business segments are:

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

• Crude Oil Transportation—the ownership and operation of a FERC-regulated crude oil pipeline system; and

• Gathering, Processing & Terminalling—the ownership and operation of natural gas gathering and processing facilities; crude oil storage and terminalling facilities; the provision of water business services primarily to the oil and gas exploration and production industry; the transportation of NGLs; and the marketing of crude oil and NGLs.

Natural Gas Transportation. TEP provides natural gas transportation and storage services for customers in the Rocky Mountain, Midwest and Appalachian regions of the United States through: (1) its 49.99% membership interest in Rockies Express, which owns the Rockies Express Pipeline, a FERC-regulated natural gas pipeline system extending from Opal, Wyoming and Meeker, Colorado to Clarington, Ohio (the "Rockies Express Pipeline") and its 100% membership interest in Tallgrass NatGas Operator, LLC ("NatGas"), which operates the Rockies Express Pipeline, (2) the Tallgrass Interstate Gas Transmission system, a FERC-regulated natural gas transportation and storage system located in Colorado, Kansas, Missouri, Nebraska and Wyoming (the "TIGT System"), and (3) the Trailblazer Pipeline system, a FERC-regulated natural gas pipeline system extending from the Colorado and Wyoming border to Beatrice, Nebraska (the "Trailblazer Pipeline"). As discussed in Note 4 – Acquisitions and Dispositions, Tallgrass Equity acquired a 25.01% membership interest in Rockies Express from TD as of February 7, 2018.

Crude Oil Transportation. TEP provides crude oil transportation to customers in Wyoming, Colorado, and the surrounding regions through Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a FERC-regulated crude oil pipeline commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma, and includes a lateral in Northeast Colorado commencing in Weld County, Colorado that interconnects with the pipeline just east of Sterling, Colorado (the "Pony Express System"). In the second quarter of 2018, Pony Express placed into service an extension of the system from a new origin near Platteville, Colorado to the Buckingham Terminal.

6

Gathering, Processing & Terminalling. TEP provides natural gas gathering and processing services for customers in Wyoming through: (1) a natural gas gathering system in the Powder River Basin (the "Douglas Gathering System"), (2) the Casper and Douglas natural gas processing facilities, and (3) the West Frenchie Draw natural gas treating facility. TEP also provides NGL transportation services in Northeast Colorado and Wyoming. TEP performs water business services, including freshwater transportation and produced water gathering and disposal, in Colorado, Texas, Wyoming, and North Dakota through BNN Water Solutions, LLC ("Water Solutions"), and crude oil storage and terminalling services through TEP's 100% membership interest in Tallgrass Terminals, LLC ("Terminals"), which owns and operates crude oil terminals in Colorado, Oklahoma, and Kansas. The Gathering, Processing & Terminalling segment also includes Stanchion Energy, LLC ("Stanchion"), which transacts in crude oil.

The term "Terminals Predecessor" refers to Terminals and the term "NatGas Predecessor" refers to NatGas prior to their acquisition by TEP on January 1, 2017. Terminals Predecessor and NatGas 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 Terminals Predecessor and NatGas Predecessor prior to January 1, 2017.

TEGP Merger Agreement

On March 26, 2018, we announced the execution of a definitive Agreement and Plan of Merger (the "Merger Agreement") pursuant to which we will acquire the approximately 47.6 million TEP common units held by the public in a share-for-unit merger transaction that is taxable to TEP unitholders for U.S. federal income tax purposes at a ratio of 2.0 Class A shares for each outstanding TEP common unit. As a result of the proposed transaction, TEP's incentive distribution rights will be cancelled, its common units will no longer be publicly traded, and 100% of its equity interests will be owned by Tallgrass Equity and its subsidiaries. Upon closing of the merger transaction, we will change our name to Tallgrass Energy, LP ("Tallgrass Energy") and will trade on the New York Stock Exchange under the ticker symbol "TGE." Tallgrass Energy will continue to be taxed as a corporation for U.S. federal income tax purposes.

The Merger Agreement has been unanimously approved by the board of directors of our general partner, the conflicts committee of the board of directors of TEP GP, and the board of directors of TEP GP. Subject to customary approvals and conditions, including the approval by holders of a majority of the outstanding TEP common units, the merger is expected to close by the end of the second quarter of 2018.

In connection with the proposed transaction, we filed with the Securities and Exchange Commission (“SEC”) a registration statement on Form S-4 that included a preliminary proxy statement/prospectus for the TEP unitholders. The registration statement has not yet been declared effective. The description of the proposed transaction above is not a substitute for the proxy statement/prospectus or registration statement or for any other document that TEGP or TEP may file with the SEC and send to TEGP’s and/or TEP’s shareholders or unitholders in connection with the proposed transaction. Investors and security holders of TEGP and TEP are urged to read the proxy statement/prospectus and other documents filed with the SEC carefully and in their entirety when they become available because they will contain important information. Investors and security holders will be able to obtain free copies of the proxy statement/prospectus and other documents filed with the SEC by TEGP or TEP through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by TEGP and TEP will be available free of charge on TEGP’s and TEP’s website at www.tallgrassenergylp.com, in the "Investor Relations" tab near the top of the page.

2. Summary of Significant Accounting Policies

Basis of Presentation

These condensed consolidated financial statements and related notes for the three months ended March 31, 2018 and 2017 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board's Accounting Standards Codification, the single source of accounting principles generally accepted 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 all disclosures required by GAAP for annual periods. The condensed consolidated financial statements for the three months ended March 31, 2018 and 2017 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair statement 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.

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Our financial results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018. The accompanying condensed consolidated interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017 ("2017 Form 10-K") filed with the SEC on February 13, 2018.

The condensed consolidated financial statements include the accounts of TEGP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net income or loss from consolidated subsidiaries that are not wholly-owned by TEGP is attributed to TEGP and noncontrolling interests in accordance with the respective ownership interests.

TEP closed the acquisition of Terminals and NatGas effective January 1, 2017. As the acquisitions of Terminals and NatGas are considered transactions between entities under common control, and a change in reporting entity, the financial information presented has been recast to include Terminals and NatGas for all periods presented.

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. We have presented separately in our condensed consolidated balance sheets, to the extent material, the liabilities of our consolidated VIEs for which creditors do not have recourse to our general credit. Our consolidated VIEs do not have material assets that can only be used to settle specific obligations of the consolidated VIEs. Tallgrass Equity is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, we have determined that we are the primary beneficiary as we have the right to receive benefits of Tallgrass Equity that could potentially be significant to Tallgrass Equity. TEP is also considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis, we have determined that TEP GP is the primary beneficiary of TEP and we continue to consolidate TEP accordingly.

Use of Estimates

Certain amounts included in or affecting these condensed 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 our 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 Pronouncement Recently Adopted

Revenue Recognition

In May 2014, the FASB issued Accounting Standards Update ("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.

Management has completed its evaluation and implemented the revised guidance using the modified retrospective method as of January 1, 2018. This approach allows us to apply the new standard to (i) all new contracts entered into after January 1, 2018 and (ii) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to members' equity. Consolidated revenues presented in the comparative consolidated financial statements for periods prior to January 1, 2018 will not be revised.

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On January 1, 2018, we recorded a cumulative effect adjustment to equity of $44.1 million, increased the carrying amount of our investment in Rockies Express by $42.8 million, and recognized a receivable from Rockies Express of $1.3 million. These adjustments relate to the cumulative effect adjustment recorded by Rockies Express of $125.2 million upon adoption of ASC 606. The cumulative effect adjustment at Rockies Express arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas during the periods prior to implementation.

Through our review process, we also identified the following changes to our revenue recognition policies that did not result in a cumulative effect adjustment on January 1, 2018:

• Gathering & Processing. We have determined that a number of our gathering & processing contracts at TMID do not represent customer arrangements under ASC 606. Instead, arrangements deemed to represent wellhead purchases of raw gas will be accounted for as supply arrangements pursuant to ASC 705. As a result, gathering & processing fees previously recognized in revenue will be reported as a reduction to cost of sales under ASC 606.

• Pipeline Loss Allowance. We have determined that pipeline loss allowance, or PLA, collected under certain crude oil transportation arrangements is a component of the transaction price where the PLA both significantly exceeds actual losses and was negotiated with the intent of providing a revenue stream to TEP. Under ASC 606, PLA barrels retained from customers will be subject to the guidance for noncash consideration and recognized in revenue at their contract inception fair value.

See Note 12 – Revenue from Contracts with Customers for revenue disclosures related to both the implementation and the additional requirements prescribed by the standard. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is (or will be) recognized and data related to contract assets and liabilities.

Accounting Pronouncements Not Yet Adopted

ASU No. 2016-02, "Leases (Topic 842)"

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02 provides a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP.

Management is currently evaluating the impact of our pending adoption of ASC 842. The status of our implementation is as follows:

• Management has formed an implementation team that meets to discuss implementation challenges, technical interpretations, industry-specific treatment of certain contract types, and project status.

• Management is in the process of gathering data and reviewing contracts in order to identify all impacted contracts.

• Management is evaluating the potential information technology and internal control changes that will be required for adoption based on the findings from its contract review process.

• Management plans to provide internal training and awareness related to the revised guidance to the key stakeholders throughout its organization.

The amendments in ASU 2016-02 are effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within that reporting period. Early application is permitted. We are currently evaluating the impact of ASU 2016-02.

3. Variable Interest Entities

TEP is a VIE of which TEP GP, our consolidated subsidiary, is the primary beneficiary. We continue to consolidate TEP accordingly. We have not provided any additional financial support other than TEP GP's initial capital contribution to acquire the general partner interest in TEP and have no contractual commitments or obligations to provide additional financial support to TEP.

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TEGP, as the managing member of Tallgrass Equity, has voting rights disproportionate to its ownership interest. As a result, we have determined that Tallgrass Equity is a VIE of which we are the primary beneficiary and we consolidate Tallgrass Equity accordingly. We have not provided any additional financial support to Tallgrass Equity other than our initial capital contribution to acquire a portion of our controlling interest in Tallgrass Equity and have no contractual commitments or obligations to provide additional financial support to Tallgrass Equity.

Other than TEGP's deferred tax asset of approximately $306.3 million and $313.0 million at March 31, 2018 and December 31, 2017, respectively, the assets and liabilities included in our condensed consolidated balance sheets at March 31, 2018 and December 31, 2017 represent the consolidated assets and liabilities of Tallgrass Equity, including the assets and liabilities of TEP.

4. Acquisitions and Dispositions

Acquisition of an Additional 25.01% Membership Interest in Rockies Express and Additional TEP Common Units

In February 2018, TD merged into Tallgrass Development Holdings, a wholly-owned subsidiary of Tallgrass Equity, and as a result of the merger, Tallgrass Equity acquired a 25.01% membership interest in Rockies Express and an additional 5,619,218 TEP common units. As consideration for the acquisition, TEGP and Tallgrass Equity issued 27,554,785 unregistered TEGP Class B shares and Tallgrass Equity units, valued at approximately $644.8 million based on the closing price on February 6, 2018, to the limited partners of TD. Subsequent to the closing of the transaction, our aggregate membership interest in Rockies Express is 75%.

The transfer of the Rockies Express membership interest between TD and Tallgrass Equity is considered a transaction between entities under common control, but does not represent a change in reporting entity. As a result of the common control nature of the transaction, the acquisition resulted in the recognition of a noncash deemed contribution representing the excess carrying value of the 25.01% membership interest in Rockies Express acquired over the fair value of the consideration paid. For further discussion, see Note 11 - Partnership Equity and Distributions. As the aggregate 75% membership interest does not represent a controlling interest in Rockies Express, TEGP's investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As a result of the common control nature of the transaction, the 25.01% membership interest in Rockies Express was transferred to Tallgrass Equity at TD's historical carrying amount, including the remaining unamortized basis difference driven by the difference between the fair value of the investment and the book value of the underlying assets and liabilities on November 13, 2012, the date of acquisition by TD. For additional information, see Note 8 - Investments in Unconsolidated Affiliates.

The acquisition of an additional 5,619,218 TEP common units is considered an acquisition of noncontrolling interest and resulted in the recognition of a noncash deemed distribution representing the excess purchase price over the $53.8 million carrying value of the 5,619,218 TEP units acquired as of February 7, 2018. For further discussion, see Note 11 - Partnership Equity and Distributions.

As of February 7, 2018, the negative basis difference in Rockies Express carried over from TD was approximately $376.5 million. The amount of the basis difference allocated to property, plant and equipment is accreted over 35 years, which equates to the 2.86% composite depreciation rate utilized by Rockies Express to depreciate the underlying property, plant and equipment. The amount allocated to long-term debt is amortized over the remaining life of the various debt facilities. At March 31, 2018, the basis difference for the membership interests acquired by TEP in May 2016 and March 2017, and by Tallgrass Equity in February 2018 were allocated as follows:

	Basis Difference			Amortization Period
	(in thousands)
Long-term debt	$	48,455		2 - 25 years
Property, plant and equipment	(1,175,719		)	35 years
Total basis difference	$	(1,127,264	)

TEP Sale of Tallgrass Crude Gathering

In February 2018, TEP entered into an agreement with an affiliate of Silver Creek Midstream, LLC ("Silver Creek") to sell its 100% membership interest in Tallgrass Crude Gathering, LLC ("TCG"), which owns a 50-mile crude oil gathering system in the Powder River Basin, for approximately $50.0 million. The sale of TCG closed on February 23, 2018. During the three months ended March 31, 2018, TEP recognized a gain of $9.4 million on the sale which is presented in the line item "Gain on disposal of assets" in the condensed consolidated statements of income.

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Iron Horse Joint Venture

In February 2018, TEP entered into an agreement with Silver Creek to form Iron Horse Pipeline, LLC ("Iron Horse"), a new joint venture pipeline to transport crude oil from the Powder River Basin. During the three months ended March 31, 2018, TEP contributed an initial $3.5 million and committed to funding its proportionate share of the remaining costs of construction in exchange for a 75% membership interest in Iron Horse. TEP's investment in Iron Horse is accounted for under the equity method of accounting and reported as "Unconsolidated investments" on the condensed consolidated balance sheets.

TEP Acquisition of Additional 2% Membership Interest in Pony Express

In February 2018, TEP acquired the remaining 2% membership interest in Pony Express, along with administrative assets consisting primarily of information technology assets, from TD for cash consideration of approximately $60 million, bringing its aggregate membership interest in Pony Express to 100%. The acquisition of the remaining 2% 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 has not been recast to reflect the additional 2% membership interest. The transaction resulted in a deemed distribution of $16.2 million to TEP GP.

TEP Acquisition of BNN North Dakota

In January 2018, TEP acquired 100% of the membership interests in Buckhorn Energy Services, LLC and Buckhorn SWD Solutions, LLC, which were subsequently merged and renamed BNN North Dakota, LLC ("BNN North Dakota"), for approximately $95.0 million, net of cash acquired, subject to working capital adjustments. BNN North Dakota owns a produced water gathering and disposal system in the Bakken basin with approximately 133,000 acres under dedication. The transaction qualifies as an acquisition of a business and is accounted for as a business combination under ASC 805.

The following represents the fair value of assets acquired and liabilities assumed (in thousands):

Accounts receivable	$	2,457
Inventory	67
Property, plant and equipment	48,900
Intangible asset	46,800			(1)
Accounts payable and accrued liabilities	(3,224		)
Net identifiable assets acquired (excluding cash)	$	95,000

⁽¹⁾  The $46.8 million intangible asset acquired represents three major customer relationships. This intangible asset is amortized on a straight-line basis over a period of 8 - 14 years, the remaining terms of the underlying contracts at the time of acquisition.

At March 31, 2018, 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 identifying and measuring 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. Actual revenue and net income attributable to TEGP from BNN North Dakota of $3.1 million and $0.2 million, respectively, was recognized in the accompanying condensed consolidated statements of income for the period from January 12, 2018 to March 31, 2018.

Pro Forma Financial Information

Unaudited pro forma revenue and net income attributable to TEGP for the three months ended March 31, 2018 and 2017 is presented below as if the acquisition of BNN North Dakota had been completed on January 1, 2017.

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	179,522	$	146,716
Net income attributable to TEGP	$	16,761	$	11,939

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The pro forma financial information is not necessarily indicative of what the actual results of operations or financial position of TEGP would have been if the transaction had in fact occurred on the date or for the period indicated, nor does it purport to project the results of operations or financial position of TEGP 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 transaction or the costs to achieve these cost savings, operating synergies, and revenue enhancements.

Acquisition of Deeprock North and Merger with Deeprock Development

In January 2018, Terminals acquired an approximate 38% membership interest in Deeprock North, LLC ("Deeprock North") from Kinder Morgan Deeprock North Holdco LLC for cash consideration of $19.5 million. Immediately following the acquisition, Deeprock North was merged into Deeprock Development, LLC ("Deeprock Development"), and the members of Deeprock North and Deeprock Development received adjusted membership interests in the combined entity. As a result, Terminals recognized additional noncontrolling interests in Deeprock Development of $31.8 million. The acquisition of Deeprock North by Deeprock Development has been accounted for as an asset acquisition, with substantially all of the fair value allocated to the long-lived assets acquired based on their relative fair values. After the acquisition and merger, Terminals owns an approximate 60% membership interest in the combined entity.

5. Related Party Transactions

As a result of our relationship with Tallgrass Energy Holdings, LLC ("Tallgrass Energy Holdings") and its affiliates, we have entered into a number of related party transactions. The following disclosure includes those related party transactions which are not otherwise disclosed in these notes to our condensed consolidated financial statements.

We have no employees. In connection with the closing of the TEP initial public offering on May 17, 2013, TEP and its general partner entered into an Omnibus Agreement with Tallgrass Energy Holdings and certain of its affiliates (the "TEP Omnibus Agreement"). The TEP Omnibus Agreement provides that, among other things, TEP will reimburse Tallgrass Energy Holdings 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 Tallgrass Energy Holdings and its affiliates, 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. In addition, in connection with the closing of our initial public offering on May 12, 2015 (the "TEGP IPO"), TEGP entered into an Omnibus Agreement (the "TEGP Omnibus Agreement") with TEGP Management, LLC, Tallgrass Equity and Tallgrass Energy Holdings.

Totals of transactions with affiliated companies, excluding transactions disclosed elsewhere in these notes, are as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Processing and other revenues (1)	$	1,896	$	1,632
Cost of transportation services (2)	$	—	$	4,507
Charges to TEGP: (3)
Property, plant and equipment, net	$	—	$	293
Operations and maintenance	$	—	$	6,277
General and administrative	$	—	$	9,573

⁽¹⁾  Reflects the fee that NatGas receives as the operator of the Rockies Express Pipeline.

⁽²⁾  Reflects rent expense for the crude oil storage at the Deeprock Terminal prior to our consolidation of Deeprock Development during the third quarter of 2017.

⁽³⁾  Charges to TEGP, inclusive of Tallgrass Equity and TEP, include indirectly charged wages and salaries, other compensation and benefits, and shared services for periods prior to January 1, 2018. Effective January 1, 2018, these costs are incurred by TEP directly and, in the case of certain employee compensation and benefits, paid on TEP's behalf by its affiliate, Tallgrass Management, LLC pursuant to the TEP Omnibus Agreement.

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

	March 31, 2018		December 31, 2017
	(in thousands)
Receivable from related parties:
Rockies Express Pipeline LLC	$	4,324	$	1,340
Iron Horse Pipeline, LLC	148		—
Total receivable from related parties	$	4,472	$	1,340
Accounts payable to related parties:
Tallgrass Operations, LLC (1)	$	—	$	5,342
Total accounts payable to related parties	$	—	$	5,342

⁽¹⁾  Reflects accounts payable for charges to TEGP, inclusive of Tallgrass Equity and TEP, including indirectly charged wages and salaries, other compensation and benefits, and shared services prior to January 1, 2018 as discussed above.

Gas imbalances with affiliated shippers are as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Affiliate gas imbalance receivables	$	13	$	18
Affiliate gas imbalance payables	$	269	$	442

6. Inventory

The components of inventory at March 31, 2018 and December 31, 2017 consisted of the following:

	March 31, 2018		December 31, 2017
	(in thousands)
Crude oil	$	21,517	$	12,792
Materials and supplies	5,914		5,891
Natural gas liquids	607		942
Gas in underground storage	4,109		1,984
Total inventory	$	32,147	$	21,609

7. Property, Plant and Equipment

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

	March 31, 2018			December 31, 2017
	(in thousands)
Crude oil pipelines	$	1,252,262		$	1,220,379
Gathering, processing and terminalling assets (1)	744,515			675,092
Natural gas pipelines	585,483			581,400
General and other	118,355			98,680
Construction work in progress	112,464			97,978
Accumulated depreciation and amortization	(314,364		)	(279,192		)
Total property, plant and equipment, net	$	2,498,715		$	2,394,337

⁽¹⁾  Includes approximately $46.2 million and $40.1 million of assets associated with the acquisitions of Deeprock North and BNN North Dakota, respectively, in January 2018.

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8. Investments in Unconsolidated Affiliates

Our investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. During the three months ended March 31, 2018, we recognized equity in earnings associated with our aggregate 75% membership interest in Rockies Express of $67.1 million, inclusive of the amortization of the negative basis difference, and received distributions from and made contributions to Rockies Express of $87.8 million and $3.2 million, respectively. As discussed in Note 4 - Acquisitions and Dispositions, Tallgrass Equity acquired an additional 25.01% membership interest in Rockies Express in February 2018.

Summarized financial information for Rockies Express is as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	230,058	$	201,338
Operating income	$	128,678	$	107,369
Net income to Members	$	90,968	$	66,250

9. Risk Management

We enter into derivative contracts with third parties for the purpose of hedging exposures that accompany our normal business activities. Our normal business activities directly and indirectly expose us to risks associated with changes in the market price of crude oil and natural gas, among other commodities. For example, the risks associated with changes in the market price of crude oil and natural gas include, among others (i) pre-existing or anticipated physical crude oil and natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. We have 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 our derivative contracts included in the condensed consolidated balance sheets:

	Balance Sheet Location	March 31, 2018		December 31, 2017
		(in thousands)
Crude oil derivative contracts (1)	Current assets	$	306	$	—
Crude oil derivative contracts (1)	Current liabilities	$	—	$	2,368

⁽¹⁾  As of March 31, 2018, the fair value shown for crude oil derivative contracts represents the forward sale of 242,000 barrels which will settle throughout the second quarter of 2018. As of December 31, 2017, the fair value shown for crude oil derivative contracts represents the forward sale of 356,000 barrels of crude oil which settled in the first quarter of 2018.

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Effect of Derivative Contracts in the Statements of Income

The following table summarizes the impact of derivative contracts not designated as hedging contracts for the three months ended March 31,2018 and 2017:

	Location of gain recognized in income on derivatives	Amount of gain recognized in income on derivatives
		Three Months Ended March 31,
		2018		2017
		(in thousands)
Derivatives not designated as hedging contracts:
Crude oil derivative contracts	Sales of natural gas, NGLs, and crude oil	$	4,295	$	663
Natural gas derivative contracts	Sales of natural gas, NGLs, and crude oil	$	—	$	173
Call option derivative	Other income, net	$	—	$	1,885

Call Option Derivative

As part of TEP's acquisition of an additional 31.3% membership interest in Pony Express effective January 1, 2016, TD granted TEP an 18 month call option at an exercise price of $42.50 per TEP common unit covering the 6,518,000 TEP common units issued to TD as a portion of the consideration. On February 1, 2017, TEP exercised the remainder of the call option covering an additional 1,703,094 common units for a cash payment of $72.4 million. These common units were deemed canceled upon the exercise of the call option and as of the applicable exercise date were no longer issued and outstanding.

Credit Risk

We have counterparty credit risk as a result of our use of derivative contracts. Counterparties to our commodity derivatives consist of market participants and major financial institutions. This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions. The counterparty to our call option derivative was TD.

Our derivative contracts are entered into with counterparties through central trading organizations such as futures, options or stock exchanges or counterparties outside of central trading organizations. While we typically enter into derivative transactions with investment grade counterparties and actively monitor 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 our crude oil derivative contracts at March 31, 2018 was:

	Asset Position
	(in thousands)
Gross	$	306
Netting agreement impact	—
Cash collateral held	—
Net exposure	$	306

As of March 31, 2018 and December 31, 2017, we had $0.8 million and $3.0 million, respectively, of cash in margin accounts and outstanding letters of credit in support of our commodity derivative contracts.

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Fair Value

Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). OTC commodity 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. We use 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. The call option granted by TD was valued using a Black-Scholes option pricing model. Key inputs to the valuation model included the term of the option, risk free rate, the exercise price and current market price, expected volatility and expected distribution yield of the underlying units. The call option valuation was classified within Level 2 of the fair value hierarchy as the value was based on significant observable inputs.

The following table summarizes the fair value measurements of our derivative contracts as of March 31, 2018 and December 31, 2017, based on the fair value hierarchy:

			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)
As of March 31, 2018:
Crude oil derivative contracts	$	306	$	—	$	306	$	—
			Liability 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)
As of December 31, 2017:
Crude oil derivative contracts	$	2,368	$	—	$	2,368	$	—

10. Long-term Debt

Long-term debt consisted of the following at March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Tallgrass Equity revolving credit facility	$	124,000		$	146,000
TEP revolving credit facility	816,000			661,000
TEP 5.50% senior notes due September 15, 2024	750,000			750,000
TEP 5.50% senior notes due January 15, 2028	750,000			750,000
Less: Deferred financing costs, net (1)	(17,628		)	(17,737		)
Plus: Unamortized premium on 2028 Notes	3,642			3,730
Total long-term debt, net	$	2,426,014		$	2,292,993

⁽¹⁾  Deferred financing costs, net as presented above relate solely to the 2024 and 2028 Notes. Deferred financing costs associated with our revolving credit facilities are presented in noncurrent assets on our condensed consolidated balance sheets.

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TEP Senior Unsecured Notes due 2028

On September 15, 2017, TEP and Tallgrass Energy Finance Corp. (the "Co-Issuer" and together with TEP, the "Issuers"), the Guarantors named therein and U.S. Bank, National Association, as trustee, entered into an Indenture dated September 15, 2017 (the "2028 Indenture") pursuant to which the Issuers issued $500 million in aggregate principal amount of 5.50% senior notes due 2028 (the "2028 Notes"). On December 11, 2017, the Issuers issued an additional $250 million in aggregate principal amount of the 2028 Notes, which are also governed by the 2028 Indenture. The notes issued on September 15, 2017 and December 11, 2017 are treated as a single class of debt securities and have identical terms, other than the issue date and offering price.

The 2028 Indenture contains covenants that, among other things, limit TEP's ability and the ability of its restricted subsidiaries to: (i) create liens to secure indebtedness; (ii) enter into sale-leaseback transactions; and (iii) consolidate with or merge with or into, or sell substantially all TEP’s properties to, another person. As of March 31, 2018, TEP was in compliance with the covenants required under the 2028 Notes.

TEP Senior Unsecured Notes due 2024

On September 1, 2016, the Issuers, the Guarantors named therein and U.S. Bank, National Association, as trustee, entered into an Indenture dated September 1, 2016 (the "2024 Indenture"), pursuant to which the Issuers issued $400 million in aggregate principal amount of 5.50% senior notes due 2024 (the "2024 Notes"). On May 16, 2017, the Issuers issued an additional $350 million in aggregate principal amount of the 2024 Notes which are also governed by the 2024 Indenture. The notes issued on September 1, 2016 and May 16, 2017 are treated as a single class of debt securities and have identical terms, other than the issue date, offering price and first interest payment date. 

The 2024 Indenture contains covenants that, among other things, limit TEP's ability and the ability of its restricted subsidiaries to: (i) incur, assume or guarantee additional indebtedness or issue preferred units; (ii) create liens to secure indebtedness; (iii) pay distributions on equity interests in the event of default or noncompliance with the covenants required, repurchase equity securities or redeem subordinated securities; (iv) make investments; (v) restrict distributions, loans or other asset transfers from TEP's restricted subsidiaries; (vi) consolidate with or merge with or into, or sell substantially all of TEP's properties to, another person; (vii) sell or otherwise dispose of assets, including equity interests in subsidiaries; and (viii) enter into transactions with affiliates. As of March 31, 2018, TEP was in compliance with the covenants required under the 2024 Notes.

Tallgrass Equity Revolving Credit Facility

The following table sets forth the available borrowing capacity under the Tallgrass Equity revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the Tallgrass Equity revolving credit facility	$	150,000		$	150,000
Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility	(124,000		)	(146,000		)
Available capacity under the Tallgrass Equity revolving credit facility	$	26,000		$	4,000

In connection with the TEGP IPO, Tallgrass Equity entered into a $150 million senior secured revolving credit facility with Barclays Bank PLC, as administrative agent, and a syndicate of lenders, which will mature on May 12, 2020. Among various other covenants and restrictive provisions, Tallgrass Equity is required to maintain a total leverage ratio of not more than 3.00 to 1.00. As of March 31, 2018, Tallgrass Equity was 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 of 0.50%. As of March 31, 2018, the weighted average interest rate on outstanding borrowings under the Tallgrass Equity revolving credit facility was 4.38%. During the three months ended March 31, 2018, Tallgrass Equity's weighted average effective interest rate, including the interest on outstanding borrowings, commitment fees, and amortization of deferred financing costs, was 4.47%.

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TEP Revolving Credit Facility

The following table sets forth the available borrowing capacity under the TEP revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the TEP revolving credit facility	$	1,750,000		$	1,750,000
Less: Outstanding borrowings under the TEP revolving credit facility	(816,000		)	(661,000		)
Less: Letters of credit issued under the TEP revolving credit facility	(94		)	(94		)
Available capacity under the TEP revolving credit facility	$	933,906		$	1,088,906

TEP's 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 its 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 therefrom, change the nature of its 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 5.00 to 1.00 (which will be increased to 5.50 to 1.00 for certain measurement periods following the consummation of certain acquisitions), a consolidated senior secured leverage ratio of not more than 3.75 to 1.00 and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2018, TEP was in compliance with the covenants required under its revolving credit facility.

The unused portion of TEP's revolving credit facility is subject to a commitment fee, which ranges from 0.250% to 0.500%, based on TEP's total leverage ratio. As of March 31, 2018, the weighted average interest rate on outstanding borrowings under the TEP revolving credit facility was 3.27%. During the three months ended March 31, 2018, the weighted average effective interest rate under the TEP revolving credit facility, including the interest on outstanding borrowings under TEP's revolving credit facility, commitment fees, and amortization of deferred financing costs, was 3.53%.

Fair Value

The following table sets forth the carrying amount and fair value of our long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2018 and December 31, 2017, 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)
As of March 31, 2018:
Revolving credit facilities	$	—	$	940,000	$	—	$	940,000	$	940,000
2024 Notes	$	—	$	767,063	$	—	$	767,063	$	740,202
2028 Notes	$	—	$	754,425	$	—	$	754,425	$	745,812
As of December 31, 2017:
Revolving credit facilities	$	—	$	807,000	$	—	$	807,000	$	807,000
2024 Notes	$	—	$	771,645	$	—	$	771,645	$	739,824
2028 Notes	$	—	$	758,168	$	—	$	758,168	$	746,169

The long-term debt borrowed under the revolving credit facilities is carried at amortized cost. As of March 31, 2018 and December 31, 2017, the fair value of borrowings under the revolving credit facilities approximates the carrying amount of the borrowings using a discounted cash flow analysis. The 2024 and 2028 Notes are carried at amortized cost, net of deferred financing costs. The estimated fair value of the 2024 and 2028 Notes is based upon quoted market prices adjusted for illiquid markets. We are not aware of any factors that would significantly affect the estimated fair value subsequent to March 31, 2018.

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11. Partnership Equity and Distributions

TEGP Distributions to Holders of Class A Shares

The following table details the distributions for the periods indicated:

Three Months Ended	Date Paid	Distributions to Class A Shareholders		Distributions per Class A Share
		(in thousands)
March 31, 2018	May 15, 2018 (1)	$	28,316	$	0.4875
December 31, 2017	February 14, 2018	21,346		0.3675
September 30, 2017	November 14, 2017	20,617		0.3550
June 30, 2017	August 14, 2017	19,891		0.3425
March 31, 2017	May 15, 2017	16,697		0.2875

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to Class A shareholders of record at the close of business on April 30, 2018.

Subsidiary Distributions

TEP Distributions. The following table shows the distributions for the periods indicated:

		Distributions								Distribution per Limited Partner Common Unit
		Limited Partner Common Units		General Partner
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2018	May 15, 2018 (1)	$	71,370	$	39,816	$	1,267	$	112,453	$	0.9750
December 31, 2017	February 14, 2018	70,638		39,125		1,251		111,014		0.9650
September 30, 2017	November 14, 2017	69,174		37,744		1,219		108,137		0.9450
June 30, 2017	August 14, 2017	67,671		36,342		1,186		105,199		0.9250
March 31, 2017	May 15, 2017	60,486		29,840		1,040		91,366		0.8350

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to unitholders of record at the close of business on April 30, 2018.

Exchange Rights

Our current Class B shareholders (collectively, the "Exchange Right Holders") own an equal number of Tallgrass Equity units. The Exchange Right Holders, and any permitted transferees of their Tallgrass Equity units, each have the right to exchange all or a portion of their Tallgrass Equity units for Class A shares at an exchange ratio of one Class A share for each Tallgrass Equity unit exchanged, which we refer to as the Exchange Right. The Exchange Right may be exercised only if, simultaneously therewith, an equal number of our Class B shares are transferred by the exercising party to us. Upon such exchange, we will cancel the Class B shares received from the exercising party.

TEP Equity Distribution Agreements

TEP has active equity distribution agreements pursuant to which it may sell from time to time through a group of managers, as its sales agents, TEP common units representing limited partner interests having an aggregate offering price of up to $100.2 million and $657.5 million. Net cash proceeds from any sale of the TEP common units may be used for general partnership purposes, which includes, among other things, TEP's exercise of the call option with respect to the 6,518,000 common units issued to TD in connection with TEP's acquisition of an additional 31.3% of Pony Express in January 2016, repayment or refinancing of debt, funding for acquisitions, capital expenditures and additions to working capital. During the three months ended March 31, 2018, TEP did not issue any common units under its equity distribution agreements.

During the three months ended March 31, 2017, TEP issued and sold 2,087,647 common units with a weighted average sales price of $48.23 per unit under its equity distribution agreements for net cash proceeds of approximately $99.4 million (net of approximately $1.3 million in commissions and professional service expenses).

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Repurchase of TEP Common Units Owned by TD

Following an offer received from TD with respect to TEP common units owned by TD not subject to the call option, TEP repurchased 736,262 TEP common units from TD at an aggregate price of approximately $35.3 million, or $47.99 per common unit, on February 1, 2017, which was approved by the conflicts committee of the board of directors of TEP's general partner. These common units were deemed canceled upon our purchase and as of such transaction date were no longer issued and outstanding.

Noncontrolling Interests

As of March 31, 2018, noncontrolling interests in our subsidiaries consisted of a 68.57% interest in Tallgrass Equity held by the Exchange Right Holders, the 64.27% limited partner interest in TEP held by the public TEP unitholders, and a 40% membership interest in Deeprock Development. During the three months ended March 31, 2018, we recognized contributions from and distributions to noncontrolling interests of $0.2 million and $89.1 million, respectively. Contributions from noncontrolling interests consisted primarily of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $51.3 million, Tallgrass Equity distributions to the Exchange Right Holders of $36.4 million, and distributions to Deeprock and Pony Express noncontrolling interests of $1.3 million.

During the three months ended March 31, 2017, we recognized contributions from and distributions to noncontrolling interests of $0.7 million and $71.4 million, respectively. Contributions from noncontrolling interests consisted primarily of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $42.5 million, Tallgrass Equity distributions to the Exchange Right Holders of $27.5 million and distributions to Pony Express noncontrolling interests of $1.4 million.

Other Contributions and Distributions

During the three months ended March 31, 2018, TEGP recognized the following other contributions and distributions:

• TEGP was deemed to have made a noncash capital distribution of $198.0 million, which represents the excess purchase price over the $53.8 million carrying value of the 5,619,218 TEP units acquired as of February 7, 2018; and

• TEGP was deemed to have received a noncash capital contribution of $108.5 million, which represents the excess carrying value of the 25.01% membership interest in Rockies Express acquired as of February 7, 2018 over the fair value of the consideration paid.

During the three months ended March 31, 2017, TEGP recognized the following other contributions and distributions:

• TEP received contributions from TD of $2.3 million primarily to indemnify TEP for costs associated with Trailblazer's Pipeline Integrity Management Program, as discussed in Note 15 – Legal and Environmental Matters.

12. Revenue from Contracts with Customers

Implementation of ASC Topic 606

As discussed in Note 2 – Summary of Significant Accounting Policies, we adopted the guidance in ASC Topic 606 effective January 1, 2018 using the modified retrospective method of adoption. As a result, revenue reported for the three months ended March 31, 2017 has not been revised. The following tables provide the impact of the guidance on our condensed consolidated balance sheet as of March 31, 2018 and the condensed consolidated statement of income for the three months ended March 31, 2018:

	March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Unconsolidated investments	$	1,446,039	$	1,392,894	$	53,145	(1)

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	Three Months Ended March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Crude oil transportation services	$	84,738	$	84,466	$	272		(2)
Sales of natural gas, NGLs, and crude oil	$	38,145	$	39,245	$	(1,100	)	(3)
Processing and other revenues	$	24,015	$	25,525	$	(1,510	)	(1)(3)
Cost of sales	$	26,351	$	28,845	$	(2,494	)	(2)(3)
Equity in earnings of unconsolidated investments	$	68,402	$	58,123	$	10,279		(1)
Net income attributable to TEGP	$	16,735	$	15,053	$	1,682
Basic net income per Class A share	$	0.29	$	0.26	$	0.03
Diluted net income per Class A share	$	0.29	$	0.26	$	0.03

⁽¹⁾  Reflects the impact on our investment in Rockies Express and the management fee collected by NatGas of the cumulative effect adjustment at Rockies Express, which arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas.

⁽²⁾  Reflects the impact to revenue and cost of sales to value PLA barrels collected under certain crude oil transportation arrangements at their contract inception fair value in revenue and record an associated lower of cost or net realizable value adjustment in cost of sales.

⁽³⁾  Reflects the reclassification of certain gathering and processing fees collected under arrangements determined to be supply arrangements, rather than customer arrangements under ASC 606, to cost of sales and the reclassification of certain commodities retained as consideration for processing services to processing fee revenue.

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Disaggregated Revenue

A summary of our revenue by line of business is as follows:

	Three Months Ended March 31, 2018
	Natural Gas Transportation segment		Crude Oil Transportation segment		Gathering, Processing, & Terminalling segment		Corporate and Other			Total Revenue
	(in thousands)
Crude oil transportation - committed shipper revenue	$	—	$	84,738	$	—	$	—		$	84,738
Natural gas transportation - firm service	33,334		—		—		(1,883		)	31,451
Water business services	—		—		13,204		—			13,204
Natural gas gathering & processing fees	—		—		5,044		—			5,044
All other (1)	2,630		3,319		5,706		(6,088		)	5,567
Total service revenue	35,964		88,057		23,954		(7,971		)	140,004
Natural gas liquids sales	—		—		23,609		—			23,609
Natural gas sales	238		—		7,847		—			8,085
Crude oil sales	—		1,909		247		—			2,156
Total commodity sales revenue	238		1,909		31,703		—			33,850
Total revenue from contracts with customers	36,202		89,966		55,657		(7,971		)	173,854
Other revenue (2)	—		—		8,181		(2,941		)	5,240
Total revenue (3)	$	36,202	$	89,966	$	63,838	$	(10,912	)	$	179,094

⁽¹⁾  Includes revenue from crude oil terminal services, interruptible natural gas transportation and storage, and natural gas park and loan service.

⁽²⁾  Includes lease and derivative revenue not subject to ASC 606.

⁽³⁾  Excludes $230.1 million of revenue recognized at Rockies Express for the three months ended March 31, 2018. See Note 8 – Investments in Unconsolidated Affiliates for additional information about our investment in Rockies Express.

Performance Obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC Topic 606. A contract's transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation and are billed and collected monthly.

All of our segments engage in commodity sales, in which our performance obligations include an obligation to deliver the specified volume of a commodity to the designated receipt point. Revenue from commodity sales is recognized at a point in time when the customer obtains control of the commodity, typically upon delivery to the designated delivery point when the customer accepts and takes possession of the commodity.

In the Natural Gas Transportation segment, our performance obligations typically include an obligation to stand ready to provide natural gas transportation, storage, or an integrated transportation and storage service over the life of the contract, which is a series. These performance obligations are satisfied over time using each day of service to measure progress toward satisfaction of the performance obligation.

In the Crude Oil Transportation segment, our performance obligations typically include an obligation to provide crude oil transportation services over the life of the contract, which is a series. These performance obligations are satisfied over time using barrels delivered to measure progress toward satisfaction of the performance obligation.

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In the Gathering, Processing & Terminalling segment, the performance obligations vary based on the operating asset and type of contract. In our natural gas gathering and processing arrangements, performance obligations typically include an obligation to provide an integrated processing service over the life of the contract, which is a series. These performance obligations are satisfied over time using each unit of gas processed to measure progress toward satisfaction of the performance obligation. In our freshwater supply arrangements, performance obligations typically include an obligation to deliver a specified volume of water to the designated receipt point. These performance obligations are satisfied at a point in time when the customer obtains control of the water. In our produced water gathering and disposal arrangements, performance obligations typically include an obligation to provide an integrated produced water gathering and disposal service over the life of the contract, which is a series. These performance obligations are satisfied over time using barrels disposed to measure progress toward satisfaction of the performance obligation.

On March 31, 2018, we had $1.7 billion of remaining performance obligations at our consolidated subsidiaries, which we refer to as total backlog. Total backlog includes performance obligations under long-term crude oil transportation contracts with committed shippers, natural gas firm transportation and firm storage contracts, and certain water business service contracts with minimum volume commitments, and excludes variable consideration that is not estimated at contract inception, as discussed further below. We expect to recognize the total backlog during the remainder of 2018 and future periods as follows (in thousands):

Year	Estimated Revenue
2018	$	387,826
2019	488,919
2020	317,235
2021	138,686
2022	129,548
Thereafter	271,311
Total	$	1,733,525

Contract Estimates

Accounting for long-term contracts involves the use of various techniques to estimate total contract revenue. Contract estimates are based on various assumptions to project the outcome of future events that often span several years. These assumptions include the anticipated volumes of crude oil expected to be delivered by our customers for transport in future periods.

The nature of our contracts gives rise to several types of variable consideration, including PLA, volumetric charges for actual volumes delivered, overrun charges, and other fees that are contingent on the actual volumes delivered by our customers. As the amount of variable consideration is allocable to each distinct performance obligation within the series of performance obligations that comprise the single performance obligation, we do not estimate the total variable consideration for the single overall performance obligation because the uncertainty related to the consideration is resolved each month as the distinct service is provided. Consequently, we are able to include in the transaction price each month the actual amount of variable consideration because no uncertainty exists surrounding the services provided that month.

Certain of our contracts include provisions in which a portion of the consideration is noncash. In our Crude Oil Transportation segment, we collect PLA from our customers. As crude oil is transported, we earn, and take title to, a portion of the oil transported for our services. Any PLA that remains after replacing losses in transit can be sold. Where PLA is determined to be a component of compensation for the transportation services provided, crude oil retained is recognized in revenue at its contract inception fair value. In our Gathering, Processing & Terminalling segment, we retain commodity products as consideration under certain of our gathering and processing arrangements. Processing fee revenue is recorded when the performance obligation is completed based on the value of the product received at the time services are performed. At this time, the variability of the non-cash consideration related to both form (price) and other-than-form (volume and product mix), which are interrelated, is resolved.

As a significant change in one or more of these estimates could affect the amount and timing of revenue recognized under our customer contracts, we review and update our contract-related estimates regularly.

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Contract Balances

The timing of revenue recognition, billings, and cash collections may result in billed accounts receivable, unbilled receivables (contract assets), and deferred revenue (contract liabilities) on our condensed consolidated balance sheets. Revenue is generally billed and collected monthly based on services provided or commodity volumes sold. In our Crude Oil Transportation segment, we recognize shipper deficiencies, or deferred revenue, for barrels committed by the customer to be transported in a month but not physically received by us for transport or delivered to the customers' agreed upon destination point. These shipper deficiencies are charged at the committed tariff rate per barrel and recorded as a contract liability until the barrels are physically transported and delivered, or when the likelihood that the customer will utilize the deficiency balance becomes remote. We also recognize contract liabilities, in the form of deferred revenue, under certain water business services contracts in the Gathering, Processing & Terminalling segment. Contract balances as of March 31, 2018 were as follows:

	March 31, 2018		January 1, 2018
	(in thousands)
Accounts receivable from contracts with customers	$	68,039	$	61,888
Other accounts receivable	63,362		56,727
Accounts receivable, net	$	131,401	$	118,615
Deferred revenue from contracts with customers (1)	$	99,922	$	88,471

⁽¹⁾  Revenue recognized during the three months ended March 31, 2018 that was included in the deferred revenue balance at the beginning of the period was $3.1 million. This revenue primarily represented the utilization of shipper deficiencies at Pony Express.

13. Net Income per Class A Share

Basic net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding Class A shares during the period. Class B shares do not share in the earnings of the Partnership. Accordingly, basic and diluted net income per Class B share has not been presented.

Diluted net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding diluted Class A shares during the period. For purposes of calculating diluted net income per Class A share, we considered the impact of possible future exercises of the Exchange Right by the Exchange Right Holders on both net income attributable to TEGP and the diluted weighted average number of Class A shares outstanding. The Exchange Right Holders refers to the group of persons who collectively own all TEGP's outstanding Class B shares and an equivalent number of Tallgrass Equity units. The Exchange Right Holders are entitled to exercise the right to exchange their Tallgrass Equity units (together with an equivalent number of TEGP Class B shares) for TEGP Class A shares at an exchange ratio of one TEGP Class A share for each Tallgrass Equity unit exchanged, which we refer to as the Exchange Right. The Exchange Right Holders primarily consist of Kelso & Company and its affiliated investment funds, The Energy & Minerals Group and its affiliated investment funds, and Tallgrass KC, LLC, which is an entity owned by certain members of TEGP's and TEP's management.

Pursuant to the TEGP partnership agreement and the Tallgrass Equity limited liability company agreement, our capital structure and the capital structure of Tallgrass Equity will generally replicate one another in order to maintain the one-for-one exchange ratio between the Tallgrass Equity units and Class B shares, on the one hand, and our Class A shares, on the other hand. As a result, the exchange of any Class B shares for Class A shares does not have a dilutive effect on basic net income per Class A share.

The following table illustrates the calculation of net income per Class A share for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018		2017
	(in thousands, except per unit amounts)
Basic Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Basic weighted average Class A Shares outstanding	58,085		58,075
Basic net income per Class A share	$	0.29	$	0.21
Diluted Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares	69		8
Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares	$	16,804	$	12,037
Basic weighted average Class A Shares outstanding	58,085		58,075
Equity Participation Shares equivalent shares	125		90
Diluted weighted average Class A Shares outstanding	58,210		58,165
Diluted net income per Class A Share	$	0.29	$	0.21

14. Regulatory Matters

There are no regulatory proceedings challenging the rates of Pony Express, Rockies Express, Tallgrass Interstate Gas Transmission, LLC ("TIGT") or Trailblazer Pipeline Company LLC ("Trailblazer"). We have made certain regulatory filings with the FERC, including the following:

Pony Express

On May 22, 2017 and May 31, 2017, Pony Express made tariff filings with the FERC in Docket Nos. IS17-263-000, IS17-464-000, and IS17-465-000 to increase the contract and non-contract rates by an amount reflecting the most recent FERC annual index adjustment of approximately 0.2%, which became effective July 1, 2017.

On November 30, 2017, Pony Express filed with the FERC in Docket No. IS18-60-000 certain changes to its tariffs to reflect the addition of two new destination points, which became effective January 1, 2018.

On December 29, 2017, Pony Express filed with the FERC in Docket No. IS18-113-000 certain changes to its tariffs to reflect a new origin point in Rooks County, Kansas, which became effective on February 1, 2018.

On February 28, 2018, Pony Express filed with the FERC in Docket No. IS18-199-000 certain changes to its tariffs to reflect a new origin point in Platteville, Colorado, which became effective on April 1, 2018.

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On March 1, 2018, Pony Express submitted proposed revisions to its Rules and Regulations Tariff in Docket No. IS18-204-000 to establish the right to accept "Specialty Batches" of oil that do not conform to the Quality Specifications reflected in the tariff, provided that the acceptance is operationally feasible. These tariff changes became effective on April 1, 2018.

On April 11, 2018, Pony Express filed with the FERC in Docket No. IS18–267–000 certain changes to its tariffs to reflect additional contract rates from a new origin point in Platteville, Colorado, which are proposed to become effective on May 1, 2018.

Rockies Express

Rockies Express Zone 3 Capacity Enhancement Project – FERC Docket No. CP15-137-000

On March 31, 2015 in Docket No. CP15-137-000, Rockies Express filed with the FERC an application for authorization to construct and operate (1) three new mainline compressor stations located in Pickaway and Fayette Counties, Ohio and Decatur County, Indiana; (2) additional compressors at an existing compressor station in Muskingum County, Ohio; and (3) certain ancillary facilities. The facilities increased the Rockies Express Zone 3 east-to-west mainline capacity by 0.8 Bcf/d. Pursuant to the FERC's obligations under the National Environmental Policy Act, FERC staff issued an Environmental Assessment for the project on August 31, 2015. On February 25, 2016, the FERC issued a Certificate of Public Convenience and Necessity authorizing Rockies Express to proceed with the project. On March 14, 2016, Rockies Express commenced construction of the project facilities. The project was placed in-service for the full 0.8 Bcf/d on January 6, 2017.

Electric Power Charge Clarification - FERC Docket No. RP17-285

On December 21, 2016, in Docket No. RP17-285, Rockies Express proposed certain revisions to the General Terms and Conditions of its tariff to clarify that the electric power costs associated with the operation of gas coolers installed in association with the Zone 3 Capacity Enhancement Project at both electric and gas powered stations, will be included in the Power Cost Tracker. Several shippers submitted comments on the proposal. The FERC issued an order on January 19, 2017 accepting the proposed revisions permitting the recovery of electric power costs from the operation of both gas and electric powered compressor stations, subject to certain clarifications.

2017 Annual and Interim FERC Fuel Tracking Filings - FERC Docket Nos. RP17-401 and RP17-1064

On February 13, 2017, in Docket No. RP17-401, Rockies Express made its annual fuel and power cost tracker filing with a proposed effective date of April 1, 2017. The FERC issued an order accepting the filing, including certain requested waivers, on March 21, 2017. On September 20, 2017, Rockies Express made its interim fuel tracker filing in Docket No. RP17-1064 with a proposed effective date of November 1, 2017. The FERC issued an order accepting the filing on October 18, 2017.

Increased Frequency of FL&U and PCT Adjustments - FERC Docket No. RP18-228

On December 1, 2017, in Docket No. RP18-228, Rockies Express made a filing with the FERC to increase the frequency in which it may adjust fixed fuel and lost and unaccounted for retainages and power cost tracker charges during the year so that its recovery of fixed fuel and lost and unaccounted for charges and power costs more closely track usage. Rockies Express proposed an effective date of April 1, 2018. The comment period ended on December 13, 2017, and no parties opposed Rockies Express’ filing. On April 4, 2018, the FERC issued a letter order accepting Rockies Express’s proposal, subject to certain modifications. Rockies Express submitted a compliance filing reflecting the approved tariff provisions and requested modifications on April 10, 2018. No comments on the compliance filing were submitted by the comment deadline of April 16, 2018. On April 18, 2018, the FERC issued an order accepting Rockies Express’s compliance filing effective April 19, 2018.

2018 Annual FERC Fuel Tracking Filing - FERC Docket No. RP18-453

On February 20, 2018, in Docket No. RP18-453, Rockies Express made its annual fuel and power cost tracker filing with a proposed effective date of April 1, 2018. The FERC issued an order accepting the filing on March 19, 2018.

Cheyenne Hub Enhancement Project - FERC Docket CP18-103

On March 2, 2018, Rockies Express submitted an application pursuant to section 7(c) of the Natural Gas Act for a certificate of public convenience and necessity authorizing the construction and operation of certain booster compressor units and ancillary facilities located at the Cheyenne Hub in Weld County, Colorado that will enable Rockies Express to provide a new hub service allowing for firm receipts and deliveries between Rockies Express and certain other interconnected pipelines at the Cheyenne Hub. Rockies Express filed this certificate application in conjunction with a concurrently filed certificate application by Cheyenne Connector, LLC ("Cheyenne Connector") for the Cheyenne Connector Pipeline Project further described below. The comment period for the Cheyenne Hub Enhancement Project closed on April 9, 2018. To date, various comments have been filed by market participants regarding the proposed project.

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Cheyenne Connector

Cheyenne Connector Pipeline Project - FERC Docket CP18-102

On March 2, 2018, Cheyenne Connector, an indirect wholly-owned subsidiary of TEP, submitted an application pursuant to section 7(c) of the Natural Gas Act for a certificate of public convenience and necessity to construct and operate a 70-mile 36 inch pipeline to transport natural gas from multiple gas processing plants in Weld County, Colorado to Rockies Express’s Cheyenne Hub. The comment period for the Cheyenne Connector Pipeline Project closed on April 9, 2018. To date, various comments have been filed by market participants regarding the proposed project.

TIGT

General Rate Case Filing - FERC Docket No. RP16-137-000, et seq.

On October 30, 2015, in Docket No. RP16-137-000, et seq., TIGT filed a general rate case with the FERC pursuant to Section 4 of the National Gas Act ("NGA"). The general rate case was ultimately resolved via settlement, which the FERC approved on November 2, 2016, and a compliance filing that modernized TIGT's FERC Gas Tariff, consistent with prior FERC orders, which the FERC accepted on March 16, 2017. Per the terms of the settlement, TIGT is required to file a new general rate case on May 1, 2019 (provided that such rate case is not pre-empted by a pre-filing settlement).

2017 Annual Fuel Tracker Filing - FERC Docket No. RP17-428-000

On February 27, 2017, in Docket No. RP17-428-000, TIGT made its annual fuel tracker filing with a proposed effective date of April 1, 2017. The filing incorporated the FL&U tracker and power cost tracker mechanisms agreed to in the TIGT Rate Case Settlement. The FERC accepted the filing on March 21, 2017.

Electric Power Charge Clarification - FERC Docket No. RP17-1051-000

On September 15, 2017, in Docket No. RP17-1051-000, TIGT proposed certain revisions to its tariff to clarify, amongst other things, that the electric power costs associated with the operation of gas coolers at both electric and gas powered stations are properly included in the Power Cost Tracker. The FERC issued an order on October 3, 2017 accepting the proposed revisions.

2018 Annual Fuel Tracker Filing - FERC Docket No. RP18-533-000

On March 1, 2018, in Docket No. RP18-533-000, TIGT made its annual fuel tracker filing with a proposed effective date of April 1, 2018. The FERC accepted the filing on March 22, 2018.

Trailblazer

2017 Annual and Interim Fuel Tracker Filings - FERC Docket Nos. RP17-549-000 and RP17-1052-000

On March 22, 2017, in Docket No. RP17-549-000, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2017. The FERC accepted the filing on April 19, 2017. On September 15, 2017, Trailblazer made its interim fuel tracker filing in Docket No. RP17-1052-000 with a proposed effective date of November 1, 2017. The FERC accepted the filing on October 13, 2017.

2018 Annual Fuel Tracker Filing - FERC Docket No. RP18-580-000

On March 22, 2018, in Docket No. in Docket No. RP18-580-000, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2018. The FERC accepted the filing on April 20, 2018.

15. Legal and Environmental Matters

Legal

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

We have evaluated claims in accordance with the accounting guidance for contingencies that we deem both probable and reasonably estimable and, accordingly, have recorded no reserve for legal claims as of March 31, 2018 or December 31, 2017.

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Rockies Express

Ultra Resources

In early 2016, Ultra Resources, Inc. ("Ultra") defaulted on its firm transportation service agreement for approximately 0.2 Bcf/d through November 11, 2019. In late March 2016, Rockies Express terminated Ultra's service agreement. On April 14, 2016, Rockies Express filed a lawsuit against Ultra for breach of contract and damages in Harris County, Texas, seeking approximately $303 million in damages and other relief. On April 29, 2016, Ultra and certain of its debtor affiliates filed for protection under Chapter 11 of the United States Bankruptcy Code in United States Bankruptcy Court for the Southern District of Texas, which operated as a stay of the Harris County state court proceeding.

On January 12, 2017, Rockies Express and Ultra entered into an agreement to settle Rockies Express' approximately $303 million claim against Ultra. In accordance with the settlement agreement, Ultra made a cash payment to Rockies Express of $150 million on July 12, 2017, and entered into a new, seven-year firm transportation agreement with Rockies Express commencing December 1, 2019, for west-to-east service of 0.2 Bcf/d at a rate of approximately $0.37 per dth/d, or approximately $26.8 million annually. TEP received its proportionate distribution from the cash settlement payment in July 2017.

Environmental, Health and Safety

We are 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. We believe that compliance with these laws will not have a material adverse impact on our 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 us to incur significant costs. We had environmental reserves of $7.7 million at March 31, 2018 and December 31, 2017.

Rockies Express

Seneca Lateral

On January 31, 2018, Rockies Express experienced an operational disruption on its Seneca Lateral due to a pipe rupture and natural gas release in a rural area in Noble County, Ohio. There were no injuries reported and no evacuations. The release required Rockies Express to shut off the flow through the segment until February 27, 2018, when temporary repairs were completed allowing the segment to be placed back into service. Total cost of remediation is expected to be approximately $4.8 million prior to any insurance recoveries. A root cause investigation is ongoing.

TMID

Casper Plant, EPA Notice of Violation

In August 2011, the 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, Tallgrass Midstream, LLC ("TMID") received a letter from the 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 EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including the expected inclusion of TIGT as a party to any possible settlement as a result of TIGT owning a compressor that is located adjacent to the Casper Gas Plant site.

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.

TMG

Archibald Booster Station

Tallgrass Midstream Gathering, LLC ("TMG") is currently a party to a remedy agreement entered into with the WDEQ in July 2013 with respect to the Archibald Booster Station located in Campbell County, Wyoming. In connection with the remedy agreement, TMG has agreed to complete certain remedial actions at the site related to a former earthen pit including semi-annual groundwater sampling, and quarterly recovery activities at monitoring wells. The facility is currently in compliance with the WDEQ under the remedy agreement.

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Irwin Booster Station

TMG is also party to a remedy agreement entered into with the WDEQ in July 2013 with respect to the Irwin Booster Station located in Converse County, Wyoming. In connection with the remedy agreement, TMG has agreed to complete certain remedial actions at the site related to a former earthen pit including semi-annual groundwater sampling. The facility is currently in compliance with the WDEQ under the remedy agreement.

Trailblazer

Pipeline Integrity Management Program

Starting in 2014 Trailblazer's operating capacity was decreased as a result of smart tool surveys that identified approximately 25 - 35 miles of pipe as potentially requiring repair or replacement. During 2016 and 2017, Trailblazer incurred approximately $21.8 million of remediation costs to address this issue, including replacing approximately 8 miles of pipe. To date the pressure and capacity reduction has not prevented Trailblazer from fulfilling its firm service obligations at existing subscription levels or had a material adverse financial impact on us. However, Trailblazer intends to continue performing remediation to increase and maximize its operating capacity over the long-term and expects to spend in excess of $20 million during 2018 for this pipe replacement and remediation work. Trailblazer is exploring all possible cost recovery options to recover expenditures, including recovery through a general rate increase, negotiated rate agreements with its customers, or other FERC-approved recovery mechanisms.

In connection with TEP's acquisition of Trailblazer in April 2014, TD agreed to indemnify TEP for certain out of pocket costs related to repairing or remediating the Trailblazer Pipeline. The contractual indemnity was capped at $20 million and subject to a $1.5 million deductible. TEP received the entirety of the $20 million from TD pursuant to the contractual indemnity as of December 31, 2017.

Pony Express

Pipeline Integrity

In connection with certain crack tool runs on the Pony Express System completed in 2015, 2016, and 2017, Pony Express completed approximately $18 million of remediation for anomalies identified on the Pony Express System associated with the initial conversion and commissioning of portions of the pipeline converted from natural gas to crude oil service. Remediation work is substantially complete as of March 31, 2018.

16. Reportable Segments

Our operations are located in the United States. We are organized into three reportable segments: (1) Natural Gas Transportation, (2) Crude Oil Transportation, and (3) Gathering, Processing & Terminalling.

Natural Gas Transportation

The Natural Gas Transportation segment is engaged in the ownership and operation of FERC-regulated interstate natural gas pipelines and an integrated natural gas storage facility that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. The Natural Gas Transportation segment includes our aggregate 75% membership interest in Rockies Express, inclusive of the additional 25.01% membership interest acquired effective February 7, 2018.

Crude Oil Transportation

The Crude Oil Transportation segment is engaged in the ownership and operation of the Pony Express System, which is a FERC-regulated crude oil pipeline serving the Bakken Shale, Denver-Julesburg and Powder River Basins, and other nearby oil producing basins. The Pony Express System also includes a lateral pipeline in Northeast Colorado, which interconnects with the Pony Express System just east of Sterling, Colorado, and an extension of the system from a new origin near Platteville, Colorado ending at the Buckingham Terminal.

Gathering, Processing & Terminalling

The Gathering, Processing & Terminalling segment is engaged in the ownership and operation of natural gas gathering and processing facilities that produce NGLs and residue gas sold in local wholesale markets or delivered into pipelines for transportation to additional end markets; our crude oil terminal services; water business services provided primarily to the oil and gas exploration and production industry; the transportation of NGLs; and Stanchion.

Corporate and Other

Corporate and Other includes corporate overhead costs that are not directly associated with the operations of our reportable segments, such as interest and fees associated with our revolving credit facilities and the 2024 and 2028 Notes, public company costs, 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.

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The following tables set forth our segment information for the periods indicated:

	Three Months Ended March 31, 2018							Three Months Ended March 31, 2017
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
	(in thousands)
Natural Gas Transportation	$	36,202	$	(1,858	)	$	34,344	$	36,428	$	(1,445	)	$	34,983
Crude Oil Transportation	89,966		(3,319		)	86,647		84,994		—			84,994
Gathering, Processing & Terminalling	63,838		(5,735		)	58,103		27,307		(2,884		)	24,423
Corporate and Other	—		—			—		—		—			—
Total revenue	$	190,006	$	(10,912	)	$	179,094	$	148,729	$	(4,329	)	$	144,400

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
Operating Income:	Total Operating Income			Inter- Segment			External Operating Income			Total Operating Income			Inter- Segment			External Operating Income
	(in thousands)
Natural Gas Transportation	$	19,384		$	(2,255	)	$	17,129		$	18,168		$	(1,445	)	$	16,723
Crude Oil Transportation	46,527			4,150			50,677			43,725			4,228			47,953
Gathering, Processing & Terminalling	23,305			(1,895		)	21,410			5,106			(2,783		)	2,323
Corporate and Other	(7,303		)	—			(7,303		)	(3,773		)	—			(3,773		)
Total Operating Income	$	81,913		$	—		$	81,913		$	63,226		$	—		$	63,226
Reconciliation to Net Income:
Equity in earnings of unconsolidated investments							68,402									20,738
Interest expense, net							(29,761		)							(16,017		)
Other income, net							451									1,955
Net income before tax							$	121,005								$	69,902

	Three Months Ended March 31,
Capital Expenditures:	2018		2017
	(in thousands)
Natural Gas Transportation	$	9,885	$	4,655
Crude Oil Transportation	16,952		7,343
Gathering, Processing & Terminalling	31,139		14,771
Corporate and Other	784		—
Total capital expenditures	$	58,760	$	26,769

Assets:	March 31, 2018		December 31, 2017
	(in thousands)
Natural Gas Transportation	$	2,143,693	$	1,606,666
Crude Oil Transportation	1,412,650		1,407,758
Gathering, Processing & Terminalling	1,095,410		943,340
Corporate and Other	341,907		334,249
Total assets	$	4,993,660	$	4,292,013

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17. Subsequent Events

Pawnee Terminal

On January 2, 2018, Terminals entered into an agreement to acquire a 51% membership interest in the Pawnee, Colorado crude oil terminal ("Pawnee Terminal") from Zenith Energy Terminals Holdings, LLC for cash consideration of approximately $31 million. The transaction closed on April 1, 2018.

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

The historical financial statements included in this Quarterly Report reflect the consolidated results of operations of TEGP's 31.43% interest in Tallgrass Equity, Tallgrass Equity's 100% membership interest in TEP GP, which owns all of the IDRs, and all of the outstanding general partner units in TEP, Tallgrass Equity's 25.6 million TEP common units, and Tallgrass Equity's 25.01% membership interest in Rockies Express. As used in this Quarterly Report, unless the context otherwise requires, "we," "us," "our," the "Partnership," "TEGP" and similar terms refer to Tallgrass Energy GP, LP, together with its consolidated subsidiaries (including Tallgrass Equity, TEP and their respective subsidiaries). The term our "general partner" refers to TEGP Management, LLC. References to "Tallgrass Development" or "TD" refer to Tallgrass Development, LP.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the 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 our 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 TEGP's "Business" in our Annual Report on Form 10-K for the year ended December 31, 2017 (our "2017 Form 10-K") filed with the United States Securities and Exchange Commission (the "SEC") on February 13, 2018.

A reference to a "Note" herein refers to the accompanying Notes to Condensed 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 Quarterly Report include our expectations of plans, strategies, objectives, growth and anticipated financial and operational performance, including guidance regarding our 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 Quarterly 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 pay distributions to our Class A shareholders;

• our expected receipt of, and amounts of, distributions from Tallgrass Equity;

our ability to complete and integrate acquisitions, including integrating the acquisitions discussed in Note 4 – Acquisitions and Dispositions;

• our ability to consummate the merger transaction with TEP pursuant to the Merger Agreement discussed in Note 1 – Description of Business;

• the demand for TEP's services, including crude oil transportation, storage, and terminalling services; natural gas transportation, storage, gathering and processing services; and water business services, as well as TEP's ability to successfully contract or re-contract with its customers;

• large or multiple customer defaults, including defaults resulting from actual or potential insolvencies;

• our ability to successfully implement our business plan;

• changes in general economic conditions;

• competitive conditions in our industry;

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

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• actions taken by governmental regulators of our assets, including the FERC;

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

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

• the price and availability of debt and equity financing;

• the level of production of crude oil, natural gas and other hydrocarbons and the resultant market prices of crude oil, natural gas, natural gas liquids, and other hydrocarbons;

• 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;

• competition from the same and alternative energy sources;

• energy efficiency and technology trends;

• operating hazards and other risks incidental to transporting, storing, and terminalling crude oil; transporting, storing, gathering and processing natural gas; and transporting, gathering and disposing of water produced in connection with hydrocarbon exploration and production activities;

• environmental liabilities or events that are not covered by an indemnity, insurance or existing reserves;

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

• interest rates;

• labor relations;

• changes in tax laws, regulations and status;

• 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

TEGP is a limited partnership that has elected to be treated as a corporation for U.S. federal income tax purposes. We were formed as part of a reorganization involving entities that were previously controlled by Tallgrass Equity to effect the TEGP IPO, which was completed on May 12, 2015.

Our sole cash-generating asset is an approximate 31.43% controlling membership interest in Tallgrass Equity. Tallgrass Equity's sole cash-generating assets consist of the direct and indirect partnership interests in TEP and its membership interest in Rockies Express as described below:

• 100% of the outstanding membership interests in TEP GP, which owns all the general partner interest in TEP as well as all the TEP IDRs. The general partner interest in TEP is represented by 834,391 general partner units, representing an approximate 1.13% general partner interest in TEP at May 3, 2018.

• 25,619,218 TEP common units, representing an approximate 34.60% limited partner interest in TEP at May 3, 2018, inclusive of the additional 5,619,218 TEP common units acquired from Tallgrass Development as of February 7, 2018 as described below.

• As of February 7, 2018, Tallgrass Development merged into Tallgrass Development Holdings, a wholly-owned subsidiary of Tallgrass Equity, and as a result of the merger, Tallgrass Equity acquired a 25.01% membership in Rockies Express and an additional 5,619,218 TEP common units. As consideration for the acquisition, TEGP and Tallgrass Equity issued 27,554,785 unregistered TEGP Class B shares and Tallgrass Equity units, valued at approximately $644.8 million based on the closing price on February 6, 2018, to the limited partners of Tallgrass Development.

TEP is a publicly traded, growth-oriented limited partnership formed in 2013 to own, operate, acquire and develop midstream energy assets in North America. TEP's operations are 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, Bakken, Marcellus, and Utica shale formations.

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TEP intends to continue to utilize the significant experience of its management team to execute its growth strategy of acquiring midstream assets, increasing utilization of its existing assets and expanding its systems through construction of additional assets.

Our reportable business segments are:

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

• Crude Oil Transportation—the ownership and operation of a FERC-regulated crude oil pipeline system; and

• Gathering, Processing & Terminalling—the ownership and operation of natural gas gathering and processing facilities; crude oil storage and terminalling facilities; the provision of water business services primarily to the oil and gas exploration and production industry; the transportation of NGLs; and the marketing of crude oil and NGLs.

Financial Presentation

TEGP has no operations outside of its indirect ownership interests in Rockies Express and TEP. TEGP is the managing member of and therefore controls Tallgrass Equity. Tallgrass Equity, in turn, controls TEP through the direct ownership of 100% of TEP GP, TEP's general partner. As a result, under GAAP, TEGP consolidates Tallgrass Equity, TEP GP, TEP, and TEP's subsidiaries. As such, TEGP's results of operations will not differ materially from the results of operations of TEP. The most noteworthy reconciling items between TEGP's condensed consolidated financial statements and TEP's condensed consolidated financial statements primarily relate to (i) the inclusion of Tallgrass Equity's 25.01% membership interest in Rockies Express (ii) the inclusion of the Tallgrass Equity revolving credit facility, (iii) the impact of TEGP's election to be treated as a corporation for U.S. federal income tax purposes and (iv) the presentation of noncontrolling interests in Tallgrass Equity and TEP. The interests in Tallgrass Equity and TEP that are not directly or indirectly owned by TEGP will be reflected as being attributable to noncontrolling interests in TEGP's condensed consolidated financial statements.

Recent Developments

TEGP Distribution Announced

On March 26, 2018, the board of directors of our general partner declared a cash distribution for the quarter ended March 31, 2018 of $0.4875 per Class A share. The distribution will be paid on May 15, 2018, to Class A shareholders of record on April 30, 2018.

TEP Distribution Announced

On March 26, 2018, the board of directors of TEP's general partner declared a cash distribution for the quarter ended March 31, 2018 of $0.9750 per common unit. The distribution will be paid on May 15, 2018, to TEP unitholders of record on April 30, 2018.

Pawnee Terminal

On January 2, 2018, Terminals entered into an agreement to acquire a 51% membership interest in the Pawnee Terminal from Zenith Energy Terminals Holdings, LLC for cash consideration of approximately $31 million. The transaction closed on April 1, 2018.

TEGP Merger Agreement

On March 26, 2018, we announced the execution of the Merger Agreement pursuant to which we will acquire the approximately 47.6 million TEP common units held by the public in a share-for-unit merger transaction that is taxable to TEP unitholders for U.S. federal income tax purposes at a ratio of 2.0 Class A shares for each outstanding TEP common unit. As a result of the proposed transaction, TEP's incentive distribution rights will be cancelled, its common units will no longer be publicly traded, and 100% of its equity interests will be owned by Tallgrass Equity and its subsidiaries. Upon closing of the merger transaction, we will change our name to Tallgrass Energy, LP ("Tallgrass Energy") and will trade on the New York Stock Exchange under the ticker symbol "TGE." Tallgrass Energy will continue to be taxed as a corporation for U.S. federal income tax purposes.

The Merger Agreement has been unanimously approved by the board of directors of our general partner, the conflicts committee of the board of directors of TEP's GP, and the board of directors of TEP GP. Subject to customary approvals and conditions, including the approval by holders of a majority of the outstanding TEP common units, the merger is expected to close by the end of the second quarter of 2018.

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In connection with the proposed transaction, we filed with the SEC a registration statement on Form S-4 that included a preliminary proxy statement/prospectus for the TEP unitholders. The registration statement has not yet been declared effective. The description of the proposed transaction above is not a substitute for the proxy statement/prospectus or registration statement or for any other document that TEGP or TEP may file with the SEC and send to TEGP’s and/or TEP’s shareholders or unitholders in connection with the proposed transaction. Investors and security holders of TEGP and TEP are urged to read the proxy statement/prospectus and other documents filed with the SEC carefully and in their entirety when they become available because they will contain important information. Investors and security holders will be able to obtain free copies of the proxy statement/prospectus and other documents filed with the SEC by TEGP or TEP through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by TEGP and TEP will be available free of charge on TEGP’s and TEP’s website at www.tallgrassenergylp.com, in the "Investor Relations" tab near the top of the page.

How We Evaluate Our Operations

We evaluate our results using, among other measures, cash distributions received from Tallgrass Equity, contract profile and volumes at TEP and Rockies Express, and operating costs and expenses of TEGP and its consolidated subsidiaries.

Cash Distributions Received from Tallgrass Equity

Our cash flow is currently generated solely by distributions received from Tallgrass Equity. Tallgrass Equity currently receives all its cash flows from distributions on its direct and indirect interests in TEP and Rockies Express. Tallgrass Equity is therefore entirely dependent upon the ability of TEP and Rockies Express to make cash distributions to its partners.

Contract Profile and Volumes

Our results are driven primarily by the volume of natural gas transportation and storage capacity, crude oil transportation, storage, and terminalling capacity, NGL transportation capacity, and water transportation, gathering and disposal capacity under firm fee contracts, as well as the volume of natural gas that we gather and process and the fees assessed for such services.

Operating Costs and Expenses

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

Results of Operations

The following provides a summary of our operating metrics for the periods indicated:

	Three Months Ended March 31,
	2018	2017
Natural Gas Transportation Segment:
Gas transportation average firm contracted volumes (MMcf/d) (1)	1,842	1,609
Crude Oil Transportation Segment:
Crude oil transportation average contracted capacity (Bbls/d)	303,580	298,580
Crude oil transportation average throughput (Bbls/d)	289,739	261,904
Gathering, Processing & Terminalling Segment:
Natural gas processing inlet volumes (MMcf/d)	117	103
Freshwater average volumes (Bbls/d)	45,512	64,754
Produced water gathering and disposal average volumes (Bbls/d)	85,406	9,760

⁽¹⁾  Volumes transported under firm fee contracts, excluding Rockies Express.

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

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Revenues:
Crude oil transportation services	$	84,738		$	84,331
Natural gas transportation services	32,196			31,685
Sales of natural gas, NGLs, and crude oil	38,145			15,381
Processing and other revenues	24,015			13,003
Total Revenues	179,094			144,400
Operating Costs and Expenses:
Cost of sales	26,351			12,370
Cost of transportation services	10,420			13,503
Operations and maintenance	16,399			12,903
Depreciation and amortization	26,123			21,403
General and administrative	18,426			14,217
Taxes, other than income taxes	8,879			8,226
Gain on disposal of assets	(9,417		)	(1,448		)
Total Operating Costs and Expenses	97,181			81,174
Operating Income	81,913			63,226
Other Income (Expense):
Equity in earnings of unconsolidated investments	68,402			20,738
Interest expense, net	(29,761		)	(16,017		)
Other income, net	451			1,955
Total Other Income (Expense)	39,092			6,676
Net income before tax	121,005			69,902
Deferred income tax expense	(6,692		)	(2,664		)
Net income	114,313			67,238
Net income attributable to noncontrolling interests	(97,578		)	(55,209		)
Net income attributable to TEGP	$	16,735		$	12,029

Three Months Ended March 31, 2018 Compared to the Three Months Ended March 31, 2017

Revenues. Total revenues were $179.1 million for the three months ended March 31, 2018, compared to $144.4 million for the three months ended March 31, 2017, which represents an increase of $34.7 million, or 24%, in total revenues. The overall increase in revenue was largely driven by increased revenues of $36.5 million and $5.0 million in the Gathering, Processing & Terminalling and the Crude Oil Transportation segment, respectively, as discussed further below, partially offset by a $6.6 million increase in eliminations of intersegment revenue.

Operating costs and expenses. Operating costs and expenses were $97.2 million for the three months ended March 31, 2018 compared to $81.2 million for the three months ended March 31, 2017, which represents an increase of $16.0 million, or 20%. The overall increase in operating costs and expenses is driven by increased operating costs and expenses of $18.3 million and $2.2 million in the Gathering, Processing & Terminalling and Crude Oil Transportation segments, respectively, partially offset by decreased operating costs and expenses of $3.1 million and $1.4 million in the Corporate and Other and Natural Gas Transportation segments, as discussed further below. The decrease in Corporate and Other expenses was primarily driven by a $6.6 million increase in eliminations of intersegment operating costs and expenses, partially offset by a $2.9 million increase in corporate general and administrative costs and a $0.6 million increase in depreciation and amortization costs due to the administrative assets acquired from TD in February 2018. The increase in corporate general and administrative costs was due to $2.1 million in expenses at TEP and Tallgrass Equity attributable to the TEGP Merger Agreement and Tallgrass Equity's acquisition of an additional 25.01% membership interest in Rockies Express and additional TEP common units, as well as equity-based compensation grants issued during the year ended December 31, 2017 under the TEP GP Long-term Incentive Plan.

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Equity in earnings of unconsolidated investments. Equity in earnings of unconsolidated investments was $68.4 million and $20.7 million for the three months ended March 31, 2018 and 2017, respectively. Equity in earnings of unconsolidated investments of $68.4 million for three months ended March 31, 2018 primarily reflects our portion of earnings and the $8.4 million of amortization of a negative basis difference associated with our aggregate 75% membership interest in Rockies Express, inclusive of Tallgrass Equity's additional 25.01% membership interest acquired in February 2018, as well as $1.3 million of equity in earnings related to our 63% membership interest in BNN Colorado Water, LLC ("BNN Colorado"). Equity in earnings of unconsolidated investments of $20.7 million for the three months ended March 31, 2017 primarily reflects our portion of earnings and the $3.5 million of amortization of a negative basis difference associated with TEP's acquisition of a 25% membership interest in Rockies Express, as well as $0.7 million of equity in earnings related to our 20% membership interest in Deeprock Development.

Interest expense, net. Interest expense of $29.8 million for the three months ended March 31, 2018 was primarily composed of interest and fees associated with the TEP and Tallgrass Equity revolving credit facilities and the 2024 Notes issued on September 1, 2016 and May 16, 2017, and the 2028 Notes issued on September 15, 2017 and December 11, 2017. Interest expense of $16.0 million for the three months ended March 31, 2017 was primarily composed of interest and fees associated with TEP and Tallgrass Equity revolving credit facilities and the 2024 Notes issued on September 1, 2016. The increase in interest and fees is primarily due to increased borrowings to fund a portion of our 2017 and 2018 acquisitions, as well as the higher borrowing rate on the 2024 and 2028 Notes, the proceeds of which were used to repay borrowings under TEP's revolving credit facility.

Other income, net. Other income, net typically includes rental income and income earned from certain customers related to the capital costs we incurred to connect these customers to our system. Other income for the three months ended March 31, 2018 was $0.5 million compared to $2.0 million for the three months ended March 31, 2017. Other income of $2.0 million for the three months ended March 31, 2017 included a $1.9 million unrealized gain on derivative instrument related to the change in fair value of the call option received from TD as part of the acquisition of an additional 31.3% membership interest in Pony Express as discussed further in Note 9 – Risk Management.

Deferred income tax expense. Deferred income tax expense for the three months ended March 31, 2018 was $6.7 million, compared to a deferred income tax expense of $2.7 million for the three months ended March 31, 2017. The increase in deferred income tax expense was driven by the increase in taxable income, primarily attributable to the increased equity in earnings associated with Rockies Express as a result of Tallgrass Equity’s acquisition of a 25.01% membership interest in Rockies Express in February 2018, partially offset by lower tax rates associated with the federal rate change under the tax legislation referred to as the Tax Cuts and Jobs Act that was signed into law on December 22, 2017.

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

Segment Financial Data - Natural Gas Transportation (1)	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenues:
Natural gas transportation services	$	34,054	$	33,130
Sales of natural gas, NGLs, and crude oil	237		1,651
Processing and other revenues	1,911		1,647
Total revenues	36,202		36,428
Operating costs and expenses:
Cost of sales	343		1,070
Cost of transportation services	132		760
Operations and maintenance	6,163		6,478
Depreciation and amortization	4,827		4,783
General and administrative	3,934		3,794
Taxes, other than income taxes	1,419		1,375
Total operating costs and expenses	16,818		18,260
Operating income	$	19,384	$	18,168

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 16 – Reportable Segments to the accompanying condensed consolidated financial statements.

Three Months Ended March 31, 2018 Compared to the Three Months Ended March 31, 2017

Revenues. Natural Gas Transportation segment revenues were $36.2 million for the three months ended March 31, 2018, compared to $36.4 million for the three months ended March 31, 2017, which represents a decrease of $0.2 million, or 1%, in segment revenues due to a $1.4 milliondecrease in sales of natural gas driven by decreased volumes sold, partially offset by a $0.9 millionincrease in natural gas transportation services due to colder weather in the first quarter of 2018, resulting in higher volumes transported during the three months ended March 31, 2018, and a $0.3 millionincrease in other revenue.

Operating costs and expenses. Operating costs and expenses in the Natural Gas Transportation segment were $16.8 million for the three months ended March 31, 2018, compared to $18.3 million for the three months ended March 31, 2017, which represents a decrease of $1.4 million, or 8%. The overall decrease in operating costs and expenses was primarily due to a $0.7 million decrease in cost of sales driven by decreased volumes of natural gas sold and a $0.6 million decrease in the cost of transportation services driven by valuation adjustments on fuel tracker liabilities.

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

Segment Financial Data - Crude Oil Transportation (1)	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenues:
Crude oil transportation services	$	88,057	$	84,331
Sales of natural gas, NGLs, and crude oil	1,909		663
Total revenues	89,966		84,994
Operating costs and expenses:
Cost of sales	1,966		—
Cost of transportation services	14,387		13,882
Operations and maintenance	2,870		2,878
Depreciation and amortization	13,366		13,015
General and administrative	4,492		5,194
Taxes, other than income taxes	6,358		6,300
Total operating costs and expenses	43,439		41,269
Operating income	$	46,527	$	43,725

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 16 – Reportable Segments to the accompanying condensed consolidated financial statements.

Three Months Ended March 31, 2018 Compared to the Three Months Ended March 31, 2017

Revenues. Crude Oil Transportation segment revenues were $90.0 million for the three months ended March 31, 2018, compared to $85.0 million for the three months ended March 31, 2017, which represents an increase of $5.0 million, or 6%, in segment revenues driven by a $3.7 millionincrease in crude oil transportation services and a $1.2 million increase in sales of crude oil primarily due to increased volumes sold during the three months ended March 31, 2018. The increase in crude oil transportation revenue was primarily driven by a $4.3 million increase in committed volume shipments that were deficient during the three months ended March 31, 2017 and a $3.7 million increase in walk-up barrels shipped during the three months ended March 31, 2018 compared to the three months ended March 31, 2017. These increases were partially offset by a $4.5 million net decrease in revenue from a committed shipper that extended its contract during the fourth quarter of 2017, thereby paying a lower tariff rate, which was partially offset by increased volumes shipped.

Operating costs and expenses. Operating costs and expenses in the Crude Oil Transportation segment were $43.4 million for the three months ended March 31, 2018 compared to $41.3 million for the three months ended March 31, 2017, which represents an increase of $2.2 million, or 5%. The overall increase in operating costs and expenses was primarily driven by a $2.0 million increase in cost of sales driven by increased volumes sold and a $0.5 million increase in cost of transportation services, partially offset by a $0.7 million decrease in general and administrative expenses.

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

Segment Financial Data - Gathering, Processing & Terminalling (1)	Three Months Ended March 31,
	2018			2017
	(in thousands)
Revenues:
Sales of natural gas, NGLs, and crude oil	$	35,999		$	13,067
Processing and other revenues	27,839			14,240
Total revenues	63,838			27,307
Operating costs and expenses:
Cost of sales	24,566			11,401
Cost of transportation services	6,289			3,089
Operations and maintenance	7,366			3,547
Depreciation and amortization	7,294			3,605
General and administrative	3,333			1,456
Taxes, other than income taxes	1,102			551
Gain on disposal of assets	(9,417		)	(1,448		)
Total operating costs and expenses	40,533			22,201
Operating income (loss)	$	23,305		$	5,106

⁽¹⁾  Segment results as presented represent total revenue and operating income, including intersegment activity. For reconciliations to the consolidated financial data, see Note 16 – Reportable Segments to the accompanying condensed consolidated financial statements.

Three Months Ended March 31, 2018 Compared to the Three Months Ended March 31, 2017

Revenues. Gathering, Processing & Terminalling segment revenues were $63.8 million for the three months ended March 31, 2018, compared to $27.3 million for the three months ended March 31, 2017, which represents a $36.5 million, or 134%, increase in segment revenues. The increase in segment revenues was primarily due to a $22.9 million increase in sales of natural gas, NGLs, and crude oil and a $13.6 million increase in processing and other revenues. The increase in sales of natural gas, NGLs, and crude oil was driven by (i) increased sales of NGLs of $10.3 million primarily due to higher throughput volumes and increased volumes sold driven by the Douglas Gathering System acquisition in June 2017, (ii) increased sales of natural gas of $7.9 million due to sales of residue gas from the Douglas Gathering System, and (iii) crude oil sales of $4.5 million at Stanchion during the first quarter of 2018. The increase in processing and other revenues was driven by (i) increased water business services revenue of $6.3 million driven by the acquisition of BNN North Dakota in January 2018 and increased produced water disposal volumes; (ii) increased terminal services revenue of $5.5 million driven by the acquisition of Deeprock North in January 2018 and the acquisition of a controlling interest in and subsequent consolidation of Deeprock Development in July 2017; and (iii) increased processing fee income of $1.6 million primarily driven by changes in the accounting treatment of certain commodities retained as consideration for processing services to processing fee revenue beginning January 1, 2018 as discussed further in Note 12 – Revenue from Contracts with Customers.

Operating costs and expenses. Operating costs and expenses in the Gathering, Processing & Terminalling segment were $40.5 million for the three months ended March 31, 2018 compared to $22.2 million for the three months ended March 31, 2017, which represents an increase of $18.3 million, or 83%. The increase in operating costs and expenses was primarily driven by (i) a $13.2 million increase in cost of sales primarily driven by higher producer settlements and higher NGL sales attributable to the acquisition of the Douglas Gathering System as discussed above, (ii) increases of $3.8 million, $3.7 million, and $1.9 million in operations and maintenance costs, depreciation and amortization, and general and administrative costs, respectively, all primarily driven by the 2018 acquisitions of BNN North Dakota and Deeprock North and the 2017 acquisitions of the Douglas Gathering System and Deeprock Development, and (iii) an increase of $3.2 million in cost of transportation services due to crude oil transportation fees paid by Stanchion during the three months ended March 31, 2018. The increase in operating costs and expenses was partially offset by the $9.4 million gain on the disposal of TCG during the three months ended March 31, 2018, compared to the $1.4 million gain on disposal of assets during the three months ended March 31, 2017.

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Liquidity and Capital Resources Overview

Our primary sources of liquidity for the three months ended March 31, 2018 were borrowings under TEP's 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 TEP's revolving credit facility; and

• future issuances of additional equity and/or debt securities.

We believe that cash on hand, cash generated from operations, and availability under TEP's revolving credit facility will be adequate to meet our operating needs, our planned short-term maintenance capital and debt service requirements, and our planned cash distributions to shareholders. We believe that future internal growth projects or potential acquisitions will be funded primarily through a combination of borrowings under TEP's revolving credit facility and issuances of debt and/or equity securities. For additional information regarding our revolving credit facility and senior unsecured notes, see Note 10 – Long-term Debt. For additional information regarding our equity transactions, see Note 11 – Partnership Equity and Distributions.

Our total liquidity as of March 31, 2018 and December 31, 2017 was as follows:

	March 31, 2018			December 31, 2017
	(in thousands)
Cash on hand	$	4,255		$	2,593
Total capacity under the TEP revolving credit facility	1,750,000			1,750,000
Less: Outstanding borrowings under the TEP revolving credit facility	(816,000		)	(661,000		)
Less: Letters of credit issued under the TEP revolving credit facility	(94		)	(94		)
Available capacity under the TEP revolving credit facility	933,906			1,088,906
Total capacity under the Tallgrass Equity revolving credit facility	$	150,000		$	150,000
Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility	(124,000		)	(146,000		)
Available capacity under the Tallgrass Equity revolving credit facility	$	26,000		$	4,000
Total liquidity	$	964,161		$	1,095,499

Working Capital

Working capital is the amount by which current assets exceed current liabilities. While various other factors may impact our working capital requirements from period to period, our working capital requirements have typically been, and we expect will continue to be, driven by changes in accounts receivable, accounts payable and deferred revenue. TEP manages its working capital needs through borrowings and repayments of borrowings under its revolving credit facility. Factors impacting changes in accounts receivable and accounts payable could include the timing of collections from customers, payments to suppliers, and the level of spending for capital expenditures. Changes in the market prices of energy commodities that we buy and sell in the normal course of business can also impact the timing of changes in accounts receivable and accounts payable. Factors impacting deferred revenue include the volume of barrels transported, the amount of deficiency payments received, and the volume of prior deficiencies utilized during the period.

As of March 31, 2018, we had a working capital deficit of $107.5 million compared to a working capital deficit of $101.6 million at December 31, 2017, which represents an increase in the working capital deficit of $6.0 million. The overall increase in the working capital deficit was primarily attributable to changes in the following components:

• an increase in accounts payable of $22.5 million primarily due to crude oil purchases at Stanchion; and

• an increase in deferred revenue of $11.5 million primarily from deficiency payments collected by Pony Express and deferred revenue at BNN North Dakota, acquired in January 2018.

These working capital decreases were partially offset by:

• an increase in accounts receivable of $12.8 million primarily due to the BNN North Dakota acquisition in January 2018, as well as crude oil sales at Stanchion;

• an increase in inventories of $10.5 million due to the purchase of line fill at Stanchion; and

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• a decrease in accounts payable of $5.3 million to related parties, as payroll and other administrative activity was moved to TEP from TD during the first quarter of 2018.

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,
	2018			2017
	(in thousands)
Net cash provided by (used in):
Operating activities	$	151,600		$	102,166
Investing activities	$	(122,913	)	$	(562,042	)
Financing activities	$	(27,025	)	$	459,470

Three Months Ended March 31, 2018 Compared to the Three Months Ended March 31, 2017

Operating Activities. Cash flows provided by operating activities were $151.6 million and $102.2 million for the three months ended March 31, 2018 and 2017, respectively. The increase in net cash flows provided by operating activities of $49.4 million was primarily driven by a $46.3 million increase in distributions received from Rockies Express as a result of our increased membership interest effective March 31, 2017 and February 7, 2018.

Investing Activities. Cash flows used in investing activities were $122.9 million for the three months ended March 31, 2018, primarily driven by:

• cash outflows of $95.0 million for the acquisition of BNN North Dakota;

• capital expenditures of $58.8 million, primarily due to spending on a 55-mile extension on the Pony Express system, construction of the Buckingham Terminal expansion, a new 70-mile natural gas pipeline located in Colorado ("Cheyenne Connector"), additional water gathering infrastructure located in North Dakota, and construction of the Grasslands and Natoma Terminals; and

• cash outflows of $19.5 million for the acquisition of a 38% membership interest in Deeprock North.

These cash outflows were partially offset by cash inflows of:

• $50.0 million from the sale of TCG; and

• $20.8 million of distributions received from Rockies Express in excess of cumulative earnings recognized.

Cash flows used in investing activities were $562.0 million for the three months ended March 31, 2017, primarily driven by:

• cash outflows of $400.0 million for the acquisition of an additional 24.99% membership interest in Rockies Express;

• cash outflows of $140.0 million for the acquisition of Terminals and NatGas; and

• capital expenditures of $26.8 million, primarily due to spending on an additional freshwater connection at Water Solutions and remediation digs on the Pony Express System as discussed in Note 15 – Legal and Environmental Matters.

These cash outflows were partially offset by $10.1 million of distributions from Rockies Express in excess of cumulative earnings recognized.

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Financing Activities. Cash flows used in financing activities were $27.0 million for the three months ended March 31, 2018, primarily driven by:

• distributions to noncontrolling interests of $89.1 million, consisting of distributions to TEP unitholders of $51.3 million, Tallgrass Equity distributions to the Exchange Right Holders of $36.4 million, and distributions to Deeprock Development and Pony Express noncontrolling interests of $1.3 million;

• cash outflows of $50.0 million for the acquisition of an additional 2% membership interest in Pony Express; and

•distributions to Class A shareholders of $21.3 million.

These financing cash outflows were partially offset by $133.0 million of net borrowings under the revolving credit facilities.

Cash flows provided by financing activities were $459.5 million for the three months ended March 31, 2017, primarily driven by:

• net borrowings under the revolving credit facilities of $552.0 million; and

• net cash proceeds of $99.4 million from the issuance of 2,087,647 TEP common units under the Equity Distribution Agreements.

These financing cash inflows were partially offset by cash outflows of:

• $72.4 million for TEP's partial exercise of the call option granted by TD covering 1,703,094 common units;

• distributions to noncontrolling interests of $71.4 million, which consisted of distributions to TEP unitholders of $42.5 million, Tallgrass Equity distributions to the Exchange Right Holders of $27.5 million, and distributions to Pony Express and Water Solutions noncontrolling interests of $1.4 million;

• $35.3 million for TEP's 736,262 common units repurchased from TD; and

• distributions to Class A shareholders of $16.1 million.

Distributions

Distributions to our Class A shareholders. We distribute 100% of our available cash at the end of each quarter to Class A shareholders of record beginning with the quarter ended June 30, 2015. Our sole cash-generating asset is an approximate 31.43% controlling membership interest in Tallgrass Equity. Tallgrass Equity's sole cash-generating assets consist of direct and indirect partnership interests in TEP and its membership interest in Rockies Express, as detailed above in "—Overview". Available cash is generally defined as all our cash and cash equivalents on hand at the date of determination in respect of such quarter less reserves established in the discretion of our general partner for future requirements. For a discussion of factors and trends impacting TEP's business, which in turn impacts our ability to pay cash distributions to our Class A shareholders, please see "—Factors and Trends Impacting Our Business" in our 2017 Form 10-K.

Our distribution for the three months ended March 31, 2018, in the amount of $0.4875 per Class A share, or $28.3 million in the aggregate, was announced on March 26, 2018 and will be paid on May 15, 2018 to Class A shareholders of record on April 30, 2018.

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 we expect will 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 $326 million for expansion capital projects and approximately $24 million for maintenance capital expenditures in 2018.

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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,
	2018		2017
	(in thousands)
Maintenance capital expenditures	$	3,030	$	63
Expansion capital expenditures	57,067		22,420
Total capital expenditures incurred	$	60,097	$	22,483

Capital expenditures incurred represent capital expenditures paid and accrued during the period. Capital expenditures are presented net of noncontrolling interest, and contributions and reimbursements received. The increase in maintenance capital expenditures to $3.0 million for the three months ended March 31, 2018 from $0.1 million for the three months ended March 31, 2017 is primarily driven by contributions from TD to TEP in order to indemnify TEP for certain out of pocket costs related to repairing or remediating the Trailblazer Pipeline during the three months ended March 31, 2017, as discussed further in Note 15 – Legal and Environmental Matters. 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. Expansion capital expenditures were $57.1 million for the three months ended March 31, 2018 compared to $22.4 million for the three months ended March 31, 2017. Expansion capital expenditures for the three months ended March 31, 2018 consisted primarily of spending on a 55-mile extension on the Pony Express system, construction of the Buckingham Terminal expansion, the Cheyenne Connector, additional water gathering infrastructure located in North Dakota, and construction of the Grasslands Terminal and the Natoma Terminal. Expansion capital expenditures of $22.4 million for the three months ended March 31, 2017 consisted primarily of spending on an additional freshwater connection at Water Solutions and remediation digs on the Pony Express System, as discussed in Note 15 – Legal and Environmental Matters.

During the three months ended March 31, 2018, TEP made an initial contribution of $3.5 million to Iron Horse, a newly formed unconsolidated affiliate. In connection with TEP's 75% membership interest in Iron Horse, TEP has made commitments to fund its proportionate share of the remaining cost to construct the pipeline, estimated at $98.5 million as of March 31, 2018. In addition, we invested cash in unconsolidated affiliates, including Rockies Express and BNN Colorado of $8.0 million and $6.7 million during the three months ended March 31, 2018 and 2017, respectively, to fund our share of capital projects. Tallgrass Equity and TEP have also committed to Rockies Express to fund the repayment of Rockies Express' $550 million 6.85% senior notes due July 15, 2018, in proportion to their aggregate 75% membership interest, which they currently intend to fund following the closing of the Merger Agreement through borrowings under TEP's revolving credit facility.

We intend to make cash distributions to our Class A shareholders. Due to our cash distribution policy, we expect that we will distribute available cash to our Class A shareholders on a quarterly basis. We expect TEP to fund future capital expenditures with funds generated from its operations, borrowings under its revolving credit facility, the issuance of additional partnership units and/or the issuance of long-term debt. If these sources are not sufficient, TEP may reduce its discretionary spending.

Contractual Obligations

There have been no material changes in our contractual obligations as reported in our 2017 Form 10-K.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements.

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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 2017 Form 10-K for the year ended December 31, 2017 and have not changed, with the exception of the following addition related to our implementation of the guidance in ASC Topic 606, Revenue from Contracts with Customers, as discussed in Note 2 – Summary of Significant Accounting Policies.

Description	Judgments and Uncertainties	Effect if Actual Results Differ from Assumptions
Revenue Recognition
The majority of our revenue is derived from long-term contracts that can span several years. Accounting for long-term contracts involves the use of various techniques to estimate total contract revenue and determine the timing of revenue recognition. We periodically evaluate our estimates with respect to the probability of our customers exercising their rights and recognize revenue associated with contract liabilities when the probability becomes remote that the customer will exercise its remaining rights.	We review our deferred revenue (contract liabilities) at each balance sheet date to determine the probability that our customers will exercise their remaining rights. We recognize revenue when the probability becomes remote that the customer will exercise its remaining rights. Our evaluation requires management to apply judgment in estimating future system capacity and the ability of our customers to utilize that capacity.	If actual results are not consistent with our assumptions and estimates, or our assumptions and estimates change due to new information, the timing of our revenue recognition with respect to deferred revenue could be impacted and we may experience material changes in revenue.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Commodity Price Risk

Historically, we have had a limited amount of direct commodity price exposure related to natural gas collected for electrical compression costs at TIGT, natural gas used at TMID and crude oil collected as part of our contractual pipeline loss allowance at Pony Express and Terminals. Accordingly, we have historically entered into derivative contracts with third parties for all or a portion of these volumes for the purpose of hedging our commodity price exposures. In addition, Stanchion transacts in crude oil and enters into physical and financial derivative contracts in connection with these transactions.

The majority of TMID's operating income comes from volumetric fee or commodity sensitive contracts. The profitability of our commodity sensitive processing contracts that include keep whole or percent of proceeds components is affected by volatility in prevailing NGL and natural gas prices. During the three months ended March 31, 2018, TMID represented 5% of operating income.

We measure the risk of price changes in our crude oil and natural gas derivatives 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 primarily 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 commodity prices.

The following table summarizes our commodity derivatives and the change in fair value that would be expected from a 10% price increase or decrease as of March 31, 2018, assuming a parallel shift in the forward curve through the end of 2018:

	Fair Value		Effect of 10% Price Increase			Effect of 10% Price Decrease
	(in thousands)
Crude oil derivative contracts (1)	$	306	$	(1,525	)	$	1,525

⁽¹⁾  Represents the forward sale of 242,000 barrels of crude oil in our Gathering, Processing & Terminalling segment which will settle throughout the second quarter of 2018.

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Interest Rate Risk

As described in Note 10 – Long-term Debt, Tallgrass Equity currently has $124 million in outstanding borrowings under its revolving credit facility. Borrowings under the credit facility bear interest, at Tallgrass Equity's 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 is 1.50%, and for loans bearing interest based on the reserve adjusted Eurodollar rate, the applicable margin is 2.50%.

As of March 31, 2018, TEP has issued $750 million of 2024 Notes and $750 million of 2028 Notes. In addition, TEP currently has a $1.75 billion revolving credit facility with borrowings of $816.0 million. 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. The applicable margin ranges from 0.50% to 1.50% for base rate borrowings and 1.50% to 2.50% for reserve adjusted Eurodollar rate borrowings, based upon our total leverage ratio.

We do not currently hedge the interest rate risk on our borrowings under the revolving credit facilities. 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 $0.4 million based on our outstanding debt under our revolving credit facilities as of March 31, 2018.

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 or guarantees as forms of credit support.

A substantial majority of our revenue is produced under long-term firm fee contracts with high-quality customers. The customer base we currently serve under these contracts generally has a strong credit profile, with a majority of our revenues derived from customers who have BBB- or Baa3 and better credit ratings or are part of corporate families with such credit ratings as of March 31, 2018.

We also have indirect credit risk exposure with respect to our investment in Rockies Express. See Item 1A.—Risk Factors in our 2017 Form 10-K for additional information.

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

During the first quarter of 2018, TEP completed the conversion to a new contract and volume management system used by TMID to support the Douglas Gathering System which was acquired in 2017. This system was utilized to produce financial information contained in this Quarterly Report. There have been no other 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, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

45

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

See Note 15 – Legal and Environmental Matters to the condensed consolidated financial statements included in Part I—Item 1.—Financial Statements of this Quarterly Report, which is incorporated herein by reference.

Item 1A. Risk Factors

Item 1A of our 2017 Form 10-K 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, 2018. There have been no material changes to the risk factors contained in our 2017 Form 10-K.

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.

46

Item 6. Exhibits

Exhibit No.	Description
2.1	Agreement and Plan of Merger, dated as of March 26, 2018, by and among Tallgrass Energy GP, LP, Tallgrass Equity, LLC, Razor Merger Sub, LLC, Tallgrass Energy Partners, LP and Tallgrass MLP GP, LLC (incorporated by reference to Exhibit 2.1 to Tallgrass Energy GP, LP’s Current Report on Form 8-K filed on March 27, 2018).
2.2*	Agreement and Plan of Merger, dated as of February 7, 2018, by and among Tallgrass Energy GP, LP, Tallgrass Development, LP, Tallgrass Equity, LLC, Tallgrass Development Holdings, LLC and Tallgrass Energy Holdings, LLC.
10.1	Support Agreement, dated as of March 26, 2018, by and among Tallgrass Energy GP, LP, Tallgrass Equity, LLC and Tallgrass Energy Partners, LP (incorporated by reference to Exhibit 10.1 to Tallgrass Energy GP, LP’s Current Report on Form 8-K filed on March 27, 2018).
10.2	Second Amended and Restated Credit Agreement, dated June 2, 2017, by and among Tallgrass Energy Partners, LP, Wells Fargo Bank, National Association, as administrative agent, and a syndicate of lenders named therein (incorporated by reference to Exhibit 10.1 to Tallgrass Energy Partners, LP’s Quarterly Report on Form 10-Q filed on August 2, 2017).
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

47

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 GP, LP
		(registrant)
		By:	TEGP Management, LLC, its general partner
Date:	May 3, 2018	By:	/s/ Gary J. Brauchle
			Name:	Gary J. Brauchle
			Title:	Executive Vice President and Chief Financial Officer
				(Duly Authorized Officer and Principal Financial Officer)

48

EX-2.2

Exhibit 2.2

AGREEMENT AND PLAN OF MERGER

dated as of February 7, 2018

by and among

TALLGRASS DEVELOPMENT, LP,

TALLGRASS DEVELOPMENT HOLDINGS, LLC,

TALLGRASS EQUITY, LLC,

TALLGRASS ENERGY GP, LP,

and, for certain limited purposes,

TALLGRASS ENERGY HOLDINGS, LLC

TABLE OF CONTENTS

ARTICLE I DEFINITIONS		7
Section 1.1	Definitions	7
Section 1.2	Construction	11
ARTICLE II THE MERGER; CLOSING		11
Section 2.1	The Merger	11
Section 2.2	Closing;Effective Time	11
Section 2.3	Effects of the Merger	11
Section 2.4	Certificate of Formation; Limited Liability Company Agreement	12
Section 2.5	Officers	12
Section 2.6	Subsequent Actions	12
Section 2.7	Merger Consideration	12
Section 2.8	Q4 Distribution	13
ARTICLE III REPRESENTATIONS AND WARRANTIES OF DEVELOPMENT		13
Section 3.1	Organization	13
Section 3.2	Authority and Approval	14
Section 3.3	No Conflict; Consents	14
Section 3.4	Capitalization; Title to Assets	15
Section 3.5	Litigation; Laws and Regulations	16
Section 3.6	Brokerage Arrangements	16
Section 3.7	Conflicts Committee Matters	17
Section 3.8	Books and Records	17
Section 3.9	Licenses; Permits	17
Section 3.10	Transactions with Affiliates	17
Section 3.11	Matter Relating to Development	17
Section 3.12	No Employees; ERISA	18
Section 3.13	No Adverse Change	18
ARTICLE IV REPRESENTATIONS AND WARRANTIES OF MERGER SUB, TE AND THE PARTNERSHIP		18
Section 4.1	Organization and Existence	18
Section 4.2	Authority and Approval	18
Section 4.3	No Conflict; Consents	18
Section 4.4	Brokerage Arrangements	19
Section 4.5	Litigation	19
Section 4.6	Investment Intent	19
ARTICLE V TAX MATTERS		19
Section 5.1	Transfer Taxes	19
Section 5.2	Liability for Taxes	20
Section 5.3	Tax Returns	21
Section 5.4	Tax Treatment and Related Covenants	21

Section 5.5	Cooperation Regarding Allocation of Purchase Price	21
Section 5.6	Conflict	22
Section 5.7	Post-Closing Matters	22
ARTICLE VI INDEMNIFICATION		22
Section 6.1	Indemnification of the Partnership	22
Section 6.2	Indemnification of Development	22
Section 6.3	Survival	23
Section 6.4	Demands	23
Section 6.5	Right to Contest and Defend	23
Section 6.6	Cooperation	24
Section 6.7	Right to Participate	24
Section 6.8	Payment of Damages	24
Section 6.9	Direct Claim	24
Section 6.10	Limitations on Indemnification	25
Section 6.11	Sole Remedy	25
ARTICLE VII MISCELLANEOUS		25
Section 7.1	Acknowledgments	25
Section 7.2	Cooperations; Further Assurances	25
Section 7.3	Expenses	26
Section 7.4	Notices	26
Section 7.5	Governing Law	28
Section 7.6	Public Statements	28
Section 7.7	Entire Agreement; Amendments and Waivers	28
Section 7.8	Conflicting Provisions	29
Section 7.9	Binding Effect and Assignment	29
Section 7.10	Serverability	29
Section 7.11	Interpretation	29
Section 7.12	Headings and Disclosure Schedule	29
Section 7.13	Multiple Counterparts	29
Section 7.14	Action by the Partnership	29

DISCLOSURE MATERIALS

Disclosure Schedule 3.3 -    No Conflict; Consents

Disclosure Schedule 3.5 -    Litigation; Laws and Regulations

Disclosure Schedule 3.7 -    Management Projections and Budget

Disclosure Schedule 3.9 -    Licenses; Permits

Disclosure Schedule 3.11 -    Disclosed Liabilities

APPENDICES

Appendix A -    Merger Sub, TE, the Partnership and Development Designated Personnel

AGREEMENT AND PLAN OF MERGER

THIS AGREEMENT AND PLAN OF MERGER, dated as of February 7, 2018 (this “Agreement”), is by and among Tallgrass Development, LP, a Delaware limited partnership (“Development”), on the one hand, and Tallgrass Equity, LLC, a Delaware limited liability company (“TE”), Tallgrass Development Holdings, LLC, a Delaware limited liability company and wholly owned subsidiary of TE (“Merger Sub”), and Tallgrass Energy GP, LP, a Delaware limited partnership (the “Partnership”), on the other hand. In addition, Tallgrass Energy Holdings, LLC, a Delaware limited liability company (“Holdings”), is a party to this Agreement for the limited purposes set forth in Section 2.7, Article V and Article VI.

RECITALS

WHEREAS, in anticipation of the transactions contemplated below, TE has formed Merger Sub;

WHEREAS, prior to the execution of this Agreement, Tallgrass Operations, LLC, a Delaware limited liability company (“Operations”), assigned its ownership of (i) a 100% membership interest in Rockies Express Holdings, LLC, a Delaware limited liability company (“Tallgrass Holdco”), (ii) a 2% membership interest in Tallgrass Pony Express Pipeline, LLC, a Delaware limited liability company (“Pony Express”), and (iii) 5,619,218 common units (“Subject Common Units”) representing limited partner interests of Tallgrass Energy Partners, LP, a Delaware limited partnership (“TEP”), including, for the avoidance of doubt, all rights to receive cash distributions on such Subject Common Units payable to Operations by virtue of its being a unitholder of record of TEP as of January 31, 2018, to Development, pursuant to that certain Assignment Agreement, effective as of February 1, 2018, by and between Operations and Development (the “Operations Assignment”);

WHEREAS, following the Operations Assignment and prior to the execution and delivery of this Agreement, Development assigned its ownership of (i) a 100% membership interest in Operations and (ii) a 2% membership interest in Pony Express to TEP and its designees, pursuant to that certain Purchase and Sale Agreement, effective as of February 1, 2018, by and between Development and TEP (the “TEP Purchase Agreement”);

WHEREAS, following the Operations Assignment and the assignments contemplated by the TEP Purchase Agreement, Development owns (i) a 100% membership interest in Tallgrass Holdco (the “Tallgrass Holdco Interest”), which owns a 25.01% membership interest (the “REX Interest”) in Rockies Express Pipeline LLC, a Delaware limited liability company (“REX”), and (ii) the Subject Common Units (together with the Tallgrass Holdco Interest, the “Development Assets”);

WHEREAS, this Agreement contemplates that the Development Limited Partners (as defined below) will be entitled to, and will receive, the cash distribution to be paid by TEP in respect of the Subject Common Units on or about February 14, 2018 (the “Q4 Distribution”);

WHEREAS, the parties desire to vest the Development Assets in Merger Sub, in exchange for equity interests to be issued by TE and by the Partnership, on behalf of Merger Sub, to holders of limited partner interests in Development (the “Development Limited Partners”), and the parties desire to effect these transactions through the mechanism of the merger of Development with and into Merger Sub upon the terms and subject to the conditions set forth in this Agreement (the “Merger”);

WHEREAS, upon the consummation of the Merger, Merger Sub will be the surviving company of the Merger;

WHEREAS, the Conflicts Committee has previously (i) received the opinion of Evercore Group L.L.C. (the “Financial Advisor”), its financial advisor, that, subject to the qualifications and assumptions set forth therein, the consideration to be paid pursuant to the Merger is fair to the Partnership and its limited partners unaffiliated with the General Partner from a financial point of view, (ii) approved the Merger and this Agreement (which approval constituted “Special Approval” pursuant to the Partnership Agreement (defined herein)), and (iii) recommended that the Board of Directors (the “Board of Directors”) of TEGP Management, LLC, a Delaware limited liability company and the general partner of the Partnership (the “General Partner”), approve the Merger and this Agreement;

WHEREAS, the Board of Directors has approved the Merger and this Agreement;

WHEREAS, the Partnership, (i) for itself, (ii) in its capacity as the managing member of TE, and (iii) in its capacity as the managing member of TE, in its capacity as the sole member of Merger Sub, has approved the Merger and this Agreement, pursuant to the Delaware Limited Liability Company Act (the “DLLCA”);

WHEREAS, a majority of members of TE (other than the Partnership) have approved the Merger and this Agreement pursuant to Section 6.8(f) of that certain Second Amended and Restated Limited Liability Company Agreement of TE, dated as of May 12, 2015 (the “TE LLC Agreement”); and

WHEREAS, the board of managers of Holdings has determined that the Merger is advisable and fair to, and in the best interests of Development, and approved this Agreement and the Merger upon the terms and subject to the conditions set forth in this Agreement, pursuant to the Delaware Revised Uniform Limited Partnership Act (the “DRULPA”).

AGREEMENT

In consideration of the premises and the respective representations, warranties, covenants, agreements and conditions contained herein, the parties hereto agree as follows:

Article IDEFINITIONS

Section 1.1Definitions.

The respective terms defined in this Section 1.1 shall, when used in this Agreement, have the respective meanings specified herein, with each such definition equally applicable to both singular and plural forms of the terms so defined:

“Action” means any claim, action, cause of action, demand, lawsuit, arbitration, inquiry, audit, notice of violation, proceeding, litigation, citation, summons, subpoena or investigation of any nature, whether civil, criminal, administrative, regulatory or otherwise, and whether at law or in equity.

“Affiliate,” when used with respect to a Person, means any other Person that directly or indirectly Controls, is Controlled by or is under common Control with such first Person; provided, however, that with respect to Merger Sub, TE and the Partnership, the term “Affiliate” shall exclude Development and Holdings. No Person shall be deemed an Affiliate of any Person solely by reason of the exercise or existence of rights, interests or remedies under this Agreement.

“Agreement” has the meaning ascribed to such term in the preamble.

“Applicable Law” has the meaning ascribed to such term in Section 3.3(a).

“Board of Directors” has the meaning ascribed to such term in the recitals.

“Ceiling Amount” has the meaning ascribed to such term in Section 6.10(a).

“Certificate of Merger” has the meaning ascribed to such term in Section 2.2(b).

“Class A Share” has the meaning given to such term in the Partnership Agreement.

“Class B Share” has the meaning given to such term in the Partnership Agreement.

“Closing” has the meaning ascribed to such term in Section 2.2.

“Closing Date” has the meaning ascribed to such term in Section 2.2.

“Code” means the Internal Revenue Code of 1986, as amended.

“Conflicts Committee” means the conflicts committee of the Board of Directors.

“Control” and its derivatives mean the possession, directly or indirectly, of the power to direct or cause the direction of the management and policies of a Person, whether through ownership of voting securities, by contract or otherwise.

“Damages” means liabilities and obligations, including all losses, deficiencies, costs, expenses, fines, interest, expenditures, claims, suits, proceedings, judgments, damages, and reasonable attorneys’ fees and reasonable expenses of investigating, defending and prosecuting litigation, arbitration and/or any governmental investigation or inquiry.

“Deductible Amount” has the meaning ascribed to such term in Section 6.10(a).

“Development” has the meaning ascribed to such term in the preamble.

“Development Assets” has the meaning ascribed to such term in the recitals.

“Development Indemnified Parties” has the meaning ascribed to such term in Section 6.2.

“Development Limited Partners” has the meaning ascribed to such term in the recitals.

“Development LP Agreement” means the Second Amended and Restated Limited Partnership Agreement of Development, dated as of May 11, 2015.

“Direct Claim” has the meaning ascribed to such term in Section 6.9.

“Disclosed Liabilities” has the meaning ascribed to such term in Section 3.11(b).

“Disclosure Schedule” has the meaning ascribed to such term in Article III.

“DLLCA” has the meaning ascribed to such term in the recitals.

“DRULPA” has the meaning ascribed to such term in the recitals.

“Effective Time” has the meaning ascribed to such term in Section 2.2(b).

“ERISA” has the meaning ascribed to such term in Section 3.12(a).

“Financial Advisor” has the meaning ascribed to such term in the recitals.

“Fundamental Representations” has the meaning ascribed to such term in Section 6.3.

“GAAP” means generally accepted accounting principles in the United States of America.

“General Partner” has the meaning ascribed to such term in the recitals.

“Governmental Authority” means any federal, state, municipal or other government, governmental court, department, commission, board, bureau, agency or instrumentality.

“Holdings” has the meaning ascribed to such term in the preamble.

“Knowledge,” as used in this Agreement with respect to a party hereof, means the actual knowledge of that party’s designated personnel. The designated personnel for Development, Merger Sub, TE and the Partnership are set forth on Appendix A.

“Lien” means any mortgage, deed of trust, lien, security interest, pledge, conditional sales contract, charge, restriction (whether on voting, sale, transfer, disposition or otherwise and excluding any restrictions in this Agreement) or other encumbrance of every type and description.

“Material Adverse Effect” means (1) prevents or delays or impairs the ability of Development and/or Holdings to perform their respective obligations under this Agreement or (2) a material adverse effect on or material adverse change in (i) the assets, liabilities, financial condition or results of operations of REX, TEP or Development, other than any effect or change (a) that impacts the natural gas transportation industry generally (including any change in the prices of natural gas or other hydrocarbon products, industry margins or any regulatory changes or changes in Applicable Law or GAAP), (b) in United States or global political or economic conditions or financial markets in general, or

(c) resulting from the announcement of the transactions contemplated by this Agreement and the taking of any actions contemplated by this Agreement, provided, that in the case of clauses (a) and (b), the impact on REX, TEP or Development, as applicable, is not materially disproportionate to the impact on similarly situated parties in the natural gas transportation industry, or (ii) the ability of the parties to perform their obligations under this Agreement or to consummate the transactions contemplated by this Agreement.

“Merger” has the meaning ascribed to such term in the recitals.

“Merger Consideration” has the meaning ascribed to such term in Section 2.7.

“Merger Sub” has the meaning ascribed to such term in the preamble.

“Minimum Claim Amount” has the meaning ascribed to such term in Section 6.10(a).

“Notice” has the meaning ascribed to such term in Section 7.4.

“Operations” has the meaning ascribed to such term in the recitals.

“Operations Assignment” has the meaning ascribed to such term in the recitals.

“Partnership” has the meaning ascribed to such term in the preamble.

“Partnership Agreement” means that certain First Amended and Restated Agreement of Limited Partnership of the Partnership, dated May 12, 2015.

“Partnership Indemnified Parties” has the meaning ascribed to such term in Section 6.1.

“Person” means an individual or entity, including any partnership, corporation, association, trust, limited liability company, joint venture, unincorporated organization or other entity.

“Permits” has the meaning ascribed to such term in Section 3.9.

“Permitted Liens” means all: (i) mechanics’, materialmen’s, repairmen’s, employees’, contractors’, operators’, carriers’, workmen’s or other like Liens or charges arising by operation of law, in the ordinary course of business or incident to the construction or improvement of any of the assets owned by REX, in each case, for amounts not yet delinquent (including any amounts being withheld as provided by law); (ii) Liens arising under conditional sales contracts and equipment leases with third parties entered into in the ordinary course of business; (iii) immaterial defects and irregularities in title, encumbrances, exceptions and other matters that, singularly or in the aggregate, will not materially interfere with the ownership, use, value, operation or maintenance of the assets owned by REX to which they pertain; (iv) Liens for Taxes that are not yet due and payable or that are being contested in good faith by appropriate proceedings; (v) pipeline, utility and similar easements and other rights in respect of surface operations; (vi) Liens supporting surety bonds, performance bonds and similar obligations issued in connection with REX’s business; and (vii) all rights to consent, by required notices to, filings with, or other actions by Governmental Authorities or third parties in connection with the sale or conveyance of easements, rights of way, licenses, facilities or interests therein if they are customarily obtained subsequent to the sale or conveyance.

“Plan” has the meaning ascribed to such term in Section 3.12(a).

“Pony Express” has the meaning ascribed to such term in the recitals.

“Q4 Distribution” has the meaning ascribed to such term in the recitals.

“REX” has the meaning ascribed to such term in the recitals.

“REX Interest” has the meaning ascribed to such term in the recitals.

“REX LLC Agreement” means that certain Second Amended and Restated Limited Liability Company Agreement of REX dated effective as of January 1, 2010, among Tallgrass Holdco (as successor by assignment to Kinder Morgan W2E Pipeline LLC), TEP REX Holdings, LLC (as successor by assignment to Sempra REX Holdings, LLC) and P66REX LLC (f/k/a COPREX LLC), as amended by that certain Amendment No. 1 to Second Amended and Restated Limited Liability Company Agreement of REX effective November 13, 2012, among Kinder Morgan W2E Pipeline LLC, Sempra REX Holdings, LLC, Tallgrass Holdco and P66REX LLC, and that certain Amendment No. 2 to Second Amended and Restated Limited Liability Company Agreement of REX effective May 5, 2016, among Tallgrass Holdco, Sempra REX Holdings, LLC and P66REX LLC.

“Securities Act” means the Securities Act of 1933, as amended.

“Subject Common Units” has the meaning ascribed to such term in the recitals.

“Surviving Company” has the meaning ascribed to such term in Section 2.1.

“Tallgrass Holdco” has the meaning ascribed to such term in the recitals.

“Tallgrass Holdco Interest” has the meaning ascribed to such term in the recitals.

“Tallgrass Holdco LLC Agreement” means that certain Limited Liability Company Agreement of Tallgrass Holdco, dated as of September 5, 2012.

“Tax” means any and all U.S. federal, state, local or foreign net income, gross income, gross receipts, sales, use, ad valorem, transfer, franchise, capital stock, profits, license, license fee, environmental, customs duty, unclaimed property or escheat payments, alternative fuels, mercantile, lease, service, withholding, payroll, employment, unemployment, social security, disability, excise, severance, registration, stamp, occupation, premium, property (real or personal), windfall profits, fuel, value added, alternative or add on minimum, estimated or other similar taxes, duties, levies, customs, tariffs, imposts or assessments (including public utility commission property tax assessments) imposed by any Governmental Authority, together with any interest, penalties or additions thereto payable to any Governmental Authority in respect thereof.

“Tax Return” means any return, declaration, report, statement, election, claim for refund or other written document, together with all attachments, amendments and supplements thereto, filed with or provided to, or required to be filed with or provided to, a Governmental Authority in respect of Taxes.

“TE” has the meaning ascribed to such term in the recitals.

“TE LLC Agreement” has the meaning ascribed to such term in the recitals.

“TE Units” has the meaning of “Unit” ascribed to such term in Section 3.1(a) of the TE LLC Agreement.

“TE Unit Quantity” means 27,554,785 TE Units.

“TEP” has the meaning ascribed to such term in the recitals.

“TEP Partnership Agreement” means that certain Amended and Restated Agreement of Limited Partnership of TEP, dated as of May 17, 2013, as amended.

“TEP Purchase Agreement” has the meaning ascribed to such term in the recitals.

“TEP’s ’34 Act Filings” has the meaning ascribed to such term in Section 3.10.

“Third Party Indemnity Claim” has the meaning ascribed to such term in Section 6.4(a).

“Transfer Taxes” has the meaning ascribed to such term in Section 5.1.

“Unaffiliated Unitholders” means holders of Class A Shares other than Holdings, the General Partner, holders of Class B Shares, and their respective Affiliates.

Section 1.2Construction.

In constructing this Agreement: (a) the word “includes” and its derivatives means “includes, without limitation” and corresponding derivative expressions; (b) the currency amounts referred to herein, unless otherwise specified, are in United States dollars; (c) whenever this Agreement refers to a number of days, such number shall refer to calendar days unless business days are specified; (d) unless otherwise specified, all references in this Agreement to “Article,” “Section,” “Disclosure Schedule,” “Exhibit,” “preamble” or “recitals” shall be references to an Article, Section, Disclosure Schedule, Exhibit, preamble or recitals hereto; and (e) whenever the context requires, the words used in this Agreement shall include the masculine, feminine and neuter and singular and the plural.

ARTICLE IITHE MERGER; CLOSING

Section 2.1The Merger.

Upon the terms and subject to the conditions of this Agreement, at the Effective Time and in accordance with the DLLCA and DRULPA, Development shall be merged with and into Merger Sub pursuant to which (a) the separate limited partnership existence of Development shall cease, (b) Merger Sub shall be the surviving entity in the Merger (the “Surviving Company”) and shall continue its existence under the Applicable Law of the State of Delaware, and (c) all of the properties, rights, privileges, powers and franchises of Development and Merger Sub will vest in the Surviving Company, and all of the debts, liabilities, obligations and duties of Development and Merger Sub will become the debts, liabilities, obligations and duties of the Surviving Company.

Section 2.2Closing; Effective Time.

(a) The closing of the Merger (the “Closing”) will be held on February 7, 2018 (the “Closing Date”) at the offices of TE at 4200 W. 115th Street, Suite 350, Leawood, Kansas 66211.

(b) As soon as practicable on the Closing Date, the parties shall cause a certificate of merger in a form agreed by the parties to be executed and filed with the Secretary of State of the State of Delaware (the “Certificate of Merger”), executed in accordance with the relevant provisions of the DLLCA and DRULPA. The Merger shall become effective upon the filing of the Certificate of Merger with the Secretary of State of the State of Delaware or at such other time as the parties shall agree and as shall be specified in the Certificate of Merger. The date and time when the Merger shall become effective is herein referred to as the “Effective Time.”

Section 2.3Effects of the Merger.

The Merger shall have the effects provided for herein and in the applicable provisions of the DLLCA and DRULPA. At the Effective Time, by virtue of the Merger and without any action on the part of Development, Merger Sub, or the Development Limited Partners or the holders of any interests in TE, the limited partnership interests in Development outstanding immediately prior to the Effective Time shall be automatically converted into and shall thereafter represent the right to receive the Merger Consideration.

Section 2.4Certificate of Formation; Limited Liability Company Agreement.

From and after the Effective Time, (a) the certificate of formation of Merger Sub, as in effect immediately prior to the Effective Time, shall be the certificate of formation of the Surviving Company until amended in accordance with the provisions thereof and Applicable Law and (b) the limited liability company agreement of Merger Sub, as in effect immediately prior to the Effective Time, shall be the limited liability company agreement of the Surviving Company until amended in accordance with the provisions thereof and Applicable Law.

Section 2.5Officers.

From and after the Effective Time, the officers of Merger Sub serving immediately prior to the Effective Time shall be the officers of the Surviving Company until the earlier of their resignation or removal or until their respective successors are duly elected and qualified in accordance with the Applicable Laws of the State of Delaware and the relevant Merger Sub governing documents, as the case may be.

Section 2.6Subsequent Actions.

(a) If, at any time after the Effective Time, the Surviving Company shall consider or be advised that any deeds, bills of sale, assignments, assurances or any other actions or things are necessary or desirable to vest, perfect or confirm of record or otherwise in the Surviving Company its right, title or interest in, to or under any of the rights, properties or assets of either Merger Sub or Development acquired or to be acquired by the Surviving Company as a result of or in connection with the Merger or otherwise to carry out this Agreement, the officers of the Surviving Company shall be authorized to execute and deliver, in the name of and on behalf of either Merger Sub or Development, all such deeds, bills of sale, assignments and assurances and to take and do, in the name and on behalf of such limited partnership or limited liability company, as applicable, all such other actions and things as may be necessary or desirable to vest, perfect or confirm any and all right, title and interest in, to and under such rights, properties or assets in the Surviving Company or otherwise to carry out this Agreement.

(b) Subject to the terms and conditions of this Agreement and Applicable Law, the parties hereto shall use their respective commercially reasonable efforts to take, or cause to be taken, all actions, and to do, or cause to be done, all things necessary, proper or advisable to consummate and make effective the transactions contemplated by this Agreement as soon as practicable.

Section 2.7Merger Consideration.

The aggregate interests to be issued on behalf of Merger Sub in respect of the Merger shall be the “Merger Consideration”. At the Closing, the Merger Consideration shall be issued as follows:

(a) TE shall issue, on behalf of Merger Sub, to each Development Limited Partner a pro rata number of TE Units equal to the product of (i) each Development Limited Partner’s percentage of limited partner interest in Development and (ii) the TE Unit Quantity, which product shall be adjusted as provided in Section 2.7(c); provided, however, that Holdings in its capacity as a Development Limited Partner hereby directs TE to issue the TE Units that Holdings is entitled to receive, as its pro rata share of the Merger Consideration, to each of Holdings’ members in accordance with the written notice provided to the Conflicts Committee on the date hereof.

(b) TEGP shall issue, on behalf of TE and Merger Sub, to each Development Limited Partner a pro rata number of Class B Shares equal to the number of TE Units issued to the Development Limited Partner pursuant to Section 2.7(a), as adjusted pursuant to Section 2.7(c); provided, however, that Holdings in its capacity as a Development Limited Partner hereby directs TEGP to issue the Class B Shares that Holdings is entitled to receive as its pro rata share of the Merger

Consideration to each of Holdings’ members in accordance with the written notice provided to the Conflicts Committee on the date hereof.

(c) Notwithstanding any other provision of this Agreement, no fractional Class B Shares or TE Units will be issued.

(d) The general partner interest in Development shall be cancelled and the holder thereof shall receive no consideration in respect thereof pursuant to the Merger.

Section 2.8Q4 Distribution.

Notwithstanding that Development has the right (assigned by the record holder of the Subject Common Units on the record date for the payment of the Q4 Distribution) to receive the Q4 Distribution, Development hereby authorizes the payment of the Q4 Distribution to the Development Limited Partners and, in addition, authorizes TE, Holdings, or any of their respective Affiliates to cause such payment to be made directly to the Development Limited Partners rather than to Development or the Surviving Company. Notwithstanding anything to the contrary in this Agreement, and for the avoidance of doubt, such authorization is only effective with respect to the distribution to be paid by TEP in respect of the Subject Common Units on or about February 14, 2018 and does not apply to (i) any distribution to be paid by TEP in respect of any other interest in TEP owned by TE or its subsidiaries or (ii) any distribution to be paid by TEP in respect of the Subject Common Units after February 14, 2018.

ARTICLE IIIREPRESENTATIONS AND WARRANTIES OF DEVELOPMENT

Development hereby represents and warrants to Merger Sub, TE and the Partnership, as of the Closing Date and except as disclosed in the disclosure schedules delivered to Merger Sub, TE and the Partnership on the date of this Agreement (collectively, the “Disclosure Schedule”) (it being understood that any information set forth on any Disclosure Schedule shall be deemed to apply to and qualify only the section or subsection of this Agreement to which it corresponds in number, unless it is reasonably apparent on its face that such information is relevant to other sections or subsections of this Agreement), as follows:

Section 3.1Organization.

(a) Development is a limited partnership duly formed, validly existing and in good standing under the laws of the State of Delaware and has all requisite limited partnership power and authority to own, operate and lease its properties and assets and to carry on its business as now conducted.

(b) Tallgrass Holdco is a limited liability company duly formed, validly existing and in good standing under the laws of the State of Delaware, and has all requisite limited liability company power and authority to own, operate and lease its properties and assets and to carry on its business as now conducted. Tallgrass Holdco is duly licensed or qualified to do business and is in good standing in the states in which the character of the properties and assets owned or held by it or the nature of the business conducted by it requires it to be so licensed or qualified, except where the failure to be so qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(c) Holdings is limited liability company duly formed, validly existing and in good standing under the laws of the State of Delaware, and has all requisite limited liability company power and authority to own, operate and lease its properties and assets and to carry on its business as now conducted. Holdings is duly licensed or qualified to do business and is in good standing in the states in which the character of the properties and assets owned or held by it or the nature of the business conducted by it requires it to be so licensed or qualified, except where the failure

to be so qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(d) REX is limited liability company duly formed, validly existing and in good standing under the laws of the State of Delaware, and has all requisite limited liability company power and authority to own, operate and lease its properties and assets and to carry on its business as now conducted. REX is duly licensed or qualified to do business and is in good standing in the states in which the character of the properties and assets owned or held by it or the nature of the business conducted by it requires it to be so licensed or qualified, except where the failure to be so qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

Section 3.2Authority and Approval.

(a) Development has full limited partnership power and authority to execute and deliver this Agreement, to consummate the transactions contemplated hereby and to perform all of the obligations hereof to be performed by it. The execution and delivery by Development of this Agreement, the consummation of the transactions contemplated hereby and the performance of all of the obligations hereof to be performed by Development have been duly authorized and approved by all requisite limited partnership action on the part of Development.

(b) This Agreement has been duly executed and delivered by Development and constitutes the valid and legally binding obligation of Development, enforceable against it in accordance with its terms, except as such enforcement may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or other similar laws affecting the enforcement of creditors’ rights and remedies generally and by general principles of equity (whether applied in a proceeding at law or in equity).

(c) Holdings has full limited liability company power and authority to execute and deliver this Agreement, to consummate the transactions contemplated hereby and to perform all of the obligations hereof to be performed by it. The execution and delivery by Holdings of this Agreement, the consummation of the transactions contemplated hereby and the performance of all of the obligations hereof to be performed by Holdings have been duly authorized and approved by all requisite limited liability company action on the part of Holdings.

(d) This Agreement has been duly executed and delivered by Holdings and constitutes the valid and legally binding obligation of Holdings, enforceable against it in accordance with its terms, except as such enforcement may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or other similar laws affecting the enforcement of creditors’ rights and remedies generally and by general principles of equity (whether applied in a proceeding at law or in equity).

Section 3.3No Conflict; Consents.

Except as set forth on Disclosure Schedule 3.3:

(a) the execution, delivery and performance of this Agreement by Development and Holdings does not, and the fulfillment and compliance with the terms and conditions hereof and the consummation of the transactions contemplated hereby will not, (i) violate, conflict with, result in any breach of, or require the consent of any Person under, any of the terms, conditions or provisions of the certificate of limited partnership, limited partnership agreement, certificate of formation, limited liability company agreement or equivalent governing instruments of Development, Holdings, Tallgrass Holdco, TEP or REX; (ii) conflict with or violate any provision of any law or administrative rule or regulation or any judicial, administrative or

arbitration order, award, judgment, writ, injunction or decree applicable to Development, Holdings, Tallgrass Holdco, TEP or REX (“Applicable Law”); (iii) conflict with, result in a breach of, constitute a default under (whether with notice or the lapse of time or both), or accelerate or permit the acceleration of the performance required by, or require any consent, authorization or approval under, or result in the suspension, termination or cancellation of, or in a right of suspension, termination or cancellation of, any indenture, mortgage, agreement, contract, commitment, license, concession, permit, lease, joint venture or other instrument to which Development, Holdings, Tallgrass Holdco, TEP or REX is a party or by which any of them or any of the assets owned by REX or TEP are bound; or (iv) result in the creation of any Lien (other than Permitted Liens) on any of the assets owned by REX or TEP under any such indenture, mortgage, agreement, contract, commitment, license, concession, permit, lease, joint venture or other instrument, except in the case of clauses (ii), (iii) and (iv) for those items which, individually or in the aggregate, would not reasonably be expected to have a Material Adverse Effect; and

(b) no notice to or consent, approval, license, permit, order or authorization of any Governmental Authority or other Person is required to be obtained or made by Development, Holdings, Tallgrass Holdco, TEP or REX in connection with the execution, delivery and performance of this Agreement or the consummation of the transactions contemplated hereby or thereby, except (i) as have been waived or obtained or with respect to which the time for asserting such right has expired or (ii) for those which individually or in the aggregate would not reasonably be expected to have a Material Adverse Effect (including such consents, approvals, licenses, permits, orders or authorizations that are not customarily obtained prior to the Closing and are reasonably expected to be obtained in the ordinary course of business following the Closing).

Section 3.4Capitalization; Title to Assets.

(a) Development owns, beneficially and of record, the Tallgrass Holdco Interest and the Subject Common Units and, pursuant to the Merger, Merger Sub will hold, immediately upon closing of the Merger, good title, free and clear of all Liens, to the Development Assets (except as set forth in this Agreement, the Tallgrass Holdco LLC Agreement, the TEP Partnership Agreement, and restrictions under applicable federal and state securities laws). Tallgrass Holdco owns, beneficially and of record, the REX Interest and upon Closing will hold good title, free and clear of all Liens, to the REX Interest (except as set forth in this Agreement, the REX LLC Agreement, and restrictions under applicable federal and state securities laws). Neither the Development Assets nor the REX Interest are subject to any agreements or understandings with respect to the voting or transfer thereof, stockholders agreements, pledge agreements, buy-sell agreements, rights of first refusal, preemptive rights or proxy arrangements (except as set forth in this Agreement, the Tallgrass Holdco LLC Agreement, the TEP Partnership Agreement, the REX LLC Agreement, and restrictions under applicable federal and state securities laws). The Subject Common Units, the Tallgrass Holdco Interest and the REX Interest have been duly authorized and are validly issued, fully paid and nonassessable (except as such nonassessability may be affected by Sections 18-607 and 18-804 of the DLLCA or Sections 27-607 and 17-8004 of the DRULPA, as applicable).

(b) There are (i) no authorized or outstanding subscriptions, warrants, options, convertible securities or other rights (contingent or otherwise) to purchase or otherwise acquire from Development any equity interests of or in Development, (ii) no commitments on the part of Development to issue membership interests, shares, subscriptions, warrants, options, convertible securities or other similar rights, and (iii) no equity securities of Development reserved for issuance for any such purpose. Development has no obligation (contingent or other) to purchase, redeem or otherwise acquire any of its equity securities or interests. Except for this Agreement and the Development LP Agreement, there is no voting trust or agreement, stockholders agreement, pledge agreement, buy-sell agreement, right of first refusal, preemptive right or proxy relating

to any equity securities of Development. Development owns no equity interests in any other Person other than the Subject Common Units, the Tallgrass Holdco Interest and (indirectly) the REX Interest.

(c) There are (i) no authorized or outstanding subscriptions, warrants, options, convertible securities or other rights (contingent or otherwise) to purchase or otherwise acquire from Tallgrass Holdco any equity interests of or in Tallgrass Holdco, (ii) no commitments on the part of Tallgrass Holdco to issue membership interests, shares, subscriptions, warrants, options, convertible securities or other similar rights, and (iii) no equity securities of Tallgrass Holdco reserved for issuance for any such purpose. Tallgrass Holdco has no obligation (contingent or other) to purchase, redeem or otherwise acquire any of its equity securities or interests. Except for this Agreement and the Tallgrass Holdco LLC Agreement, there is no voting trust or agreement, stockholders agreement, pledge agreement, buy-sell agreement, right of first refusal, preemptive right or proxy relating to any equity securities of Tallgrass Holdco. Tallgrass Holdco owns no equity interests in any other Person other than the REX Interest. Tallgrass Holdco has made all required capital contributions to REX through the date hereof.

(d) Except as contemplated by the REX LLC Agreement: (i) there are (x) no authorized or outstanding subscriptions, warrants, options, convertible securities or other rights (contingent or otherwise) to purchase or otherwise acquire from REX any equity interests of or in REX, (y) no commitments on the part of REX to issue membership interests, shares, subscriptions, warrants, options, convertible securities or other similar rights, and (z) no equity securities of REX reserved for issuance for any such purpose; (ii) REX has no obligation (contingent or other) to purchase, redeem or otherwise acquire any of its equity securities or interests; and (iii) except for this Agreement and the REX LLC Agreement, there is no voting trust or agreement, stockholders agreement, pledge agreement, buy-sell agreement, right of first refusal, preemptive right or proxy relating to any equity securities of REX. REX owns no equity interests in any other Person.

Section 3.5Litigation; Laws and Regulations.

Except as set forth on Disclosure Schedule 3.5:

(a) There are no (i) Actions pending or, to Development’s Knowledge, threatened that (i) question or involve the validity or enforceability of any of Holdings’ or Development’s obligations under this Agreement or (ii) seek (A) to prevent or delay the consummation by Holdings and/or Development of the transactions contemplated by this Agreement or (B) damages in connection with any such consummation.

(b) None of Development, Holdings, or Tallgrass Holdco is in violation of or in default under any Applicable Law, except as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

Section 3.6Brokerage Arrangements.

None of Tallgrass Holdco, Development (or any Development Limited Partner), or Holdings (or any member of Holdings) has entered (directly or indirectly) into any agreement with any Person that would obligate Development or any of Development’s post-Closing Affiliates to pay any commission, brokerage or “finder’s fee” or other similar fee in connection with this Agreement, the Assignment Agreement or the transactions contemplated hereby or thereby.

Section 3.7Conflicts Committee Matters.

(a) Neither Holdings nor Development has intentionally withheld disclosure from the Conflicts Committee or its advisors of any fact that would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(b) The projections and budgets identified on Disclosure Schedule 3.7, which were provided to the Financial Advisor by Development and its Affiliates as part of the Conflicts Committee’s review in connection with this Agreement, were prepared based upon assumptions that Development’s management believed to be reasonable as of the dates thereof and hereof, were consistent in all material respects with Development management’s expectations at the time they were prepared, and are consistent in all material respects with Development management’s expectations as of the date hereof.

Section 3.8Books and Records.

Accurate copies of the respective books of account, minute books and stock or other equity record books of Development have been made available for inspection to TE and the Partnership.

Section 3.9Licenses; Permits.

As of the date of this Agreement, except as set forth in Disclosure Schedule 3.9, each of Development and Tallgrass Holdco has all licenses, permits and authorizations issued or granted or waived by Governmental Authorities that are necessary for the conduct of its business as now being conducted (collectively, “Permits”), except, in each case, for such items for which the failure to obtain or have waived would not result in a Material Adverse Effect.

Section 3.10Transactions with Affiliates.

Except as otherwise disclosed in TEP’s public filings pursuant to the Securities and Exchange Act of 1934, as amended (“TEP’s ’34 Act Filings”), neither Development nor Tallgrass Holdco is a party to any agreement, contract or arrangement between itself, on the one hand, and Holdings or any Development Limited Partner (or any Affiliate thereof).

Section 3.11Matters Relating to Development.

(a) Development owns no assets other than (i) its direct ownership of the Tallgrass Holdco Interest and the Subject Common Units and (ii) its indirect ownership (through Tallgrass Holdco) of the REX Interest.

(b) Except as set forth in TEP’s ’34 Act Filings or on Disclosure Schedule 3.11 (such matters set forth in TEP’s ’34 Act Filings or listed on such Disclosure Schedule are referred to herein as the “Disclosed Liabilities”), there are no liabilities or obligations of Development or Tallgrass Holdco of any nature (whether known or unknown and whether accrued, absolute, contingent or otherwise) and there are no facts or circumstances that would reasonably be expected to result in any such liabilities or obligations, whether arising in the context of federal, state or local judicial, regulatory, administrative or permitting agency proceedings, or arising under contract, or otherwise, other than (x) those liabilities and/or obligations incidental to its existence and status as a Delaware limited partnership or limited liability company, such as annual fees owed to the State of Delaware and fees owed to a Delaware registered agent, (y) liabilities of Development arising out of its ownership of the Subject Common Units, and (z) liabilities of Tallgrass Holdco arising out of its ownership of the REX Interest.

Section 3.12No Employees; ERISA.

(a) Neither Development nor Tallgrass Holdco employs any employees. There exists no “employee benefit plan” (within the meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”)) for which Development or Tallgrass Holdco would have any liability (each, a “Plan”) that is subject to Title IV of ERISA or Section 412 of the Code.

(b) Each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification.

Section 3.13No Adverse Change.

Since December 31, 2016, there has been no Material Adverse Effect.

ARTICLE IVREPRESENTATIONS AND WARRANTIES OF MERGER SUB, TE AND THE PARTNERSHIP

Merger Sub, TE and the Partnership, jointly and severally, hereby represent and warrant to Development as follows:

Section 4.1Organization and Existence.

Each of Merger Sub, TE and the Partnership is a limited liability company or limited partnership, as applicable, duly formed, validly existing and in good standing under the laws of the State of Delaware and has all requisite limited liability company or limited partnership, as applicable, power and authority to own, operate and lease its properties and assets and to carry on its business as now conducted.

Section 4.2Authority and Approval.

(a) Each of Merger Sub, TE and the Partnership has full limited liability company or limited partnership, as applicable, power and authority to execute and deliver this Agreement, and each has full limited liability company or limited partnership power and authority, as applicable, to consummate the transactions contemplated hereby and to perform all of the obligations hereof to be performed by it. The execution and delivery of this Agreement, the consummation of the transactions contemplated hereby and the performance of all of the obligations hereof to be performed by Merger Sub, TE and the Partnership have been duly authorized and approved by all requisite limited liability company and limited partnership action of Merger Sub, TE and the Partnership, as applicable.

(b) This Agreement has been duly executed and delivered by or on behalf of each of Merger Sub, TE and the Partnership and constitutes the valid and legally binding obligation of each of Merger Sub, TE and the Partnership, enforceable against each of Merger Sub, TE and the Partnership in accordance with its terms, except as such enforcement may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or other similar laws affecting the enforcement of creditors’ rights and remedies generally and by general principles of equity (whether applied in a proceeding at law or in equity).

Section 4.3No Conflict; Consents.

(a) The execution, delivery and performance of this Agreement by each of Merger Sub, TE and the Partnership does not, and the fulfillment and compliance with the terms and conditions hereof and the consummation of the transactions contemplated hereby will not, (i) violate, conflict with, result in any breach of, or require the consent of any Person under, any of the terms,

conditions or provisions of the certificate of formation or limited liability company agreement of each of Merger Sub and TE or the certificate of limited partnership or limited partnership agreement of the Partnership; (ii) conflict with or violate any provision of any law or administrative rule or regulation or any judicial, administrative or arbitration order, award, judgment, writ, injunction or decree applicable to Merger Sub, TE or the Partnership or any property or asset of Merger Sub, TE or the Partnership; (iii) conflict with, result in a breach of, constitute a default under (whether with notice or the lapse of time or both), or accelerate or permit the acceleration of the performance required by, or require any consent, authorization or approval under, any indenture, mortgage, agreement, contract, commitment, license, concession, permit, lease, joint venture or other instrument to which Merger Sub, TE or the Partnership is a party or by which it is bound or to which any of its property is subject.

(b) No consent, approval, license, permit, order or authorization of any Governmental Authority or other Person is required to be obtained or made by or with respect to Merger Sub, TE or the Partnership regarding the execution, delivery, and performance of this Agreement or the consummation of the transactions contemplated hereby, except as have been waived or obtained or with respect to which the time for asserting such right has expired.

Section 4.4Brokerage Arrangements.

Neither of Merger Sub, TE nor the Partnership has entered (directly or indirectly) into any agreement with any Person that would obligate Merger Sub, TE or the Partnership or any of their Affiliates to pay any commission, brokerage or “finder’s fee” or other similar fee in connection with this Agreement or the transactions contemplated hereby or thereby.

Section 4.5Litigation.

There are no Actions pending or, to the Partnership’s Knowledge, threatened that (i) question or involve the validity or enforceability of any of Merger Sub, TE or the Partnership’s obligations under this Agreement, or (ii) seek (or reasonably might be expected to seek) (A) to prevent or delay the consummation by Merger Sub, TE or the Partnership of the transactions contemplated by this Agreement or (B) damages in connection with any such consummation.

Section 4.6Investment Intent.

Each of TE and Merger Sub is accepting the Development Assets for its own account with the present intention of holding such interests for investment purposes and not with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities Act or state securities laws. Each of Merger Sub, TE and the Partnership acknowledges that neither the Tallgrass Holdco Interest nor the Subject Common Units will be registered under the Securities Act or any applicable state securities law, and that such Development Assets may not be transferred or sold except pursuant to the registration provisions of the Securities Act or pursuant to an applicable exemption therefrom and pursuant to state securities laws and regulations as applicable.

ARTICLE VTAX MATTERS

Section 5.1Transfer Taxes.

All transfer, documentary, sales, use, stamp, registration and other similar Taxes and fees arising out of or in connection with the transactions effected pursuant to this Agreement (the “Transfer Taxes”) shall be borne by TE. TE shall file all necessary Tax Returns and other documentation with respect to such Transfer Taxes.

Section 5.2Liability for Taxes.

(a) Except for Transfer Taxes, Holdings and the Development Limited Partners shall bear and be liable for their allocable share of any Taxes imposed on or incurred by or with respect to Development (including any Taxes attributable to or arising out of the Operations Assignment or the TEP Purchase Agreement) or the Development Assets with respect to any taxable period or portion thereof ending on or prior to the Closing Date; provided that, such liability shall be allocated to Holdings and the Development Limited Partners by reference to their respective ownership interests in Development, Applicable Law, and the applicable allocation provisions in the Development LP Agreement, at the relevant time.

(b) TE shall bear and be liable for any Taxes imposed on or incurred by or with respect to Development or the Development Assets with respect to any taxable period or portion thereof beginning after the Closing Date.

(c) Except for U.S. federal income Taxes imposed on or attributable to the ownership of the Development Assets, whenever it is necessary for purposes of this Article V to determine the amount of any Taxes imposed on or incurred by or with respect to Development or the Development Assets for a taxable period beginning before and ending after the Closing Date which is allocable to the period ending on or prior to the Closing Date, the determination shall be made, in the case of property or ad valorem taxes or franchise taxes (which are measured by, or based solely upon capital, debt or a combination of capital and debt), by pro rating such Taxes ratably on a per diem basis and, in the case of other Taxes, by assuming that such partial period constitutes a separate taxable period applicable to Development or the Development Assets and by taking into account the actual taxable events occurring during such period (except that exemptions, allowances and deductions for a taxable period beginning before and ending after the Closing Date that are calculated on an annual or periodic basis, such as the deduction for depreciation, shall be apportioned to the period prior to and including the Closing Date ratably on a per diem basis). With respect to any federal income Taxes imposed on or attributable to the ownership of the Development Assets for the taxable period beginning on January 1, 2018, (i) any allocable income from TEP or REX attributable to Development’s ownership for U.S. federal income tax purposes of the Development Assets on and prior to the Closing Date shall be included in Development’s final U.S. federal income Tax Return for the short taxable period ending on the Closing Date, and (ii) any allocable income from TEP or REX attributable to TE’s ownership for U.S. federal income tax purposes of the Development Assets beginning after the Closing Date shall be included in TE’s U.S. federal income Tax Return; provided that, the parties shall determine allocable income from TEP or REX by reference to the allocation provisions in the TEP Partnership Agreement and the REX LLC Agreement, as applicable, unless otherwise required under Applicable Law. Notwithstanding anything to the contrary herein, any franchise tax paid or payable with respect to Development or the Development Assets shall be allocated to the taxable period during which the income, operations, assets or capital comprising the base of such tax is measured, regardless of whether the right to do business for another taxable period is obtained by the payment of such franchise tax.

(d) If TE or its Affiliates receives a refund of any Taxes that Holdings or the Development Limited Partners are responsible for hereunder, or if Holdings or the Development Limited Partners receive a refund of any Taxes that TE is responsible for hereunder, the party receiving such refund shall, within ninety (90) days after receipt of such refund, remit it to the party who has responsibility for such Taxes hereunder. The parties shall cooperate in order to take all necessary and reasonable steps to claim any such refund.

Section 5.3Tax Returns.

(a) Except with respect to Tax Returns applicable to REX or TEP and except with respect to Transfer Taxes, with respect to any Tax Return attributable to a taxable period ending on or before the Closing Date that is required to be filed either before or after the Closing Date with respect to Development or the Development Assets, Holdings and the Development Limited Partners shall cause such Tax Return to be prepared, cause to be included in such Tax Return all items of income, gain, loss, deduction and credit required to be included therein, and cause such Tax Return to be filed timely with the appropriate Governmental Authority.

(b) Except with respect to Tax Returns applicable to REX or TEP, with respect to any Tax Return attributable to a taxable period beginning on or before the Closing Date and ending after the Closing Date that is required to be filed after the Closing Date with respect to Development or the Development Assets, TE shall cause such Tax Return to be prepared, cause to be included in such Tax Return all items of income, gain, loss, deduction and credit required to be included therein, furnish a copy of such Tax Return to Holdings and the Development Limited Partners, and cause such Tax Return to be filed timely with the appropriate Governmental Authority. TE shall be responsible for the timely payment of all Taxes due with respect to the period covered by such Tax Return provided that TE shall have a right to recover from Holdings the amount of Taxes attributable to the portion of the taxable period ending on or prior to the Closing Date pursuant to Section 5.2(a)).

(c) Except with respect to Tax Returns applicable to REX or TEP, with regard to any Tax Return not yet filed for any taxable period that begins before the Closing Date with respect to Development or the Development Assets, the parties shall cause each such Tax Return to be prepared in accordance with past Tax accounting practices used with respect to the Tax Returns in question (unless such past practices are no longer permissible under the Applicable Law), and to the extent any items are not covered by past practices, in accordance with reasonable tax accounting practices selected by the filing party with respect to such Tax Return under this Agreement with the consent (not to be unreasonably withheld or delayed) of the non-filing party.

Section 5.4Tax Treatment and Related Covenants.

(a) The parties intend that the transactions pursuant to this Agreement will, for federal income Tax (and related state income Tax) purposes, be reported as a merger of Development into TE governed by the “assets-over” form described in Treasury Regulation Section 1.708-1(c)(3)(i), in which (i) Development is the “terminated” partnership, and (ii) the transactions are a tax-free transfer under Code Section 721(a), except to the extent any portion of the allocable assumed liabilities must be treated as the proceeds of a taxable sale of a portion of the assets of Development pursuant to Section 707 of the Code and the regulations thereunder.

(b) The parties agree to treat any allocable assumed liability as a “qualified liability” within the meaning of Treasury Regulation Section 1.707-5(a)(6) to the maximum extent permitted thereunder. Each party agrees not to assert, in connection with any Tax Return, tax audit or similar proceeding, any position inconsistent with the allocations and determinations described in this Section 5.4.

Section 5.5Cooperation Regarding Allocation of Purchase Price.

To the extent that any portion of the allocable assumed liabilities is treated as received pursuant to a sale pursuant to Treasury Regulations Section 1.707-3, the parties shall cooperate to prepare an allocation of the allocable assumed liabilities among the various classes of the Development Assets in accordance with and as provided by Section 1060 of the Code. The parties agree that, except as otherwise required by Applicable Law, any Tax Returns or other

tax information they may file or cause to be filed with any Government Authority shall be prepared and filed consistently with any such agreed upon allocation. The parties agree that, to the extent required by Applicable Law, they will each properly prepare and timely file Form 8594 in accordance with Section 1060 of the Code.

Section 5.6Conflict.

The obligations set forth in this Article V shall survive until the date that is ninety (90) days after the expiration of the applicable statute of limitations (including all periods of extension and tolling). In the event of a conflict between the provisions of this Article V and any other provisions of this Agreement, the provisions of this Article V shall control.

Section 5.7Post-Closing Matters.

Unless required by Applicable Law, after the Closing Date, neither TE nor any Affiliate of TE shall (i) make or change any Tax election, (ii) file any amended Tax Return to the extent relating to any taxable period, or portion thereof, ending on or before the Closing Date, (iii) take any action or omit to take any action, or (iv) extend the statute of limitations for any Tax Return relating to any taxable period, or portion thereof, ending on or before the Closing Date which in each case of (i), (ii), and (iii), (x) is inconsistent with past tax accounting practices of Development (unless such past practices are no longer permissible under Applicable Law), and to the extent any items are not covered by past practices (or in the event such past practices are no longer permissible under Applicable Law), in accordance with reasonable tax accounting practices and (y) results in (I) increasing the liability of Holdings or any Development Limited Partner or any Affiliate thereof for Taxes or (II) the shifting of (a) income from a taxable period or portion thereof beginning after the Closing Date to a taxable period or portion thereof ending on or before the Closing Date or (b) deductions from a taxable period or portion thereof ending on or before the Closing Date to a taxable period or portion thereof beginning after the Closing Date.

ARTICLE VIINDEMNIFICATION

Section 6.1Indemnification of the Partnership.

Subject to the limitations set forth in this Agreement, Holdings, from and after the Closing Date, shall indemnify, defend and hold Merger Sub, TE and the Partnership, their subsidiaries and their respective directors, officers, and employees, and the officers, directors and employees of the General Partner (the “Partnership Indemnified Parties”) harmless from and against any and all Damages suffered or incurred by any Partnership Indemnified Party relating to, as a result of, or arising out of (i) any breach or inaccuracy of a representation or warranty of Development in this Agreement, (ii) any breach of any agreement or covenant on the part of Development made under this Agreement or in connection with the transactions contemplated hereby, and/or (iii) the Disclosed Liabilities. For purposes of this Section 6.1, whether Development has breached any of its representations and warranties herein shall be determined without giving effect to any qualification as to “materiality” (including the word “material” or the term “Material Adverse Effect”).

Section 6.2Indemnification of Development.

Subject to the limitations set forth in this Agreement, TE, from and after the Closing Date, shall indemnify, defend and hold the Development Limited Partners and Development General Partner and their respective securityholders, directors, officers, and employees (the “Development Indemnified Parties”) harmless from and against any and all Damages suffered or incurred by the Development Indemnified Parties as a result of or arising out of (i) any breach or inaccuracy of a representation or warranty of the Partnership in this Agreement, or (ii) any breach of any agreement or covenant on the part of the Partnership made under this Agreement or in connection with the transactions contemplated hereby. For purposes of this Section 6.2, whether Merger Sub, TE or the Partnership has breached any of their representations and warranties herein shall be determined without giving effect to any qualification as to “materiality” (including the word “material” or the term “Material Adverse Effect”).

Section 6.3Survival.

All the provisions of this Agreement shall survive the Closing, notwithstanding any investigation at any time made by or on behalf of any party hereto, provided that the representations and warranties set forth in Article III and Article IV shall terminate and expire on the date that is fifteen (15) months following the Closing Date, except (a) the representations and warranties of Development set forth in Section 3.1 (Organization), Section 3.2 (Authority and Approval), Section 3.4 (Capitalization; Title to Assets), Section 3.6 (Brokerage Arrangements), Section 3.7 (Conflicts Committee Matters) and Section 3.11 (Matters Relating to Development) (collectively, the “Fundamental Representations”), which shall survive forever; and (b) the representations and warranties of the Partnership set forth in Section 4.1 (Organization and Existence), Section 4.2 (Authority and Approval) and Section 4.4 (Brokerage Arrangements), which shall survive forever. After a representation and warranty has terminated and expired, no indemnification shall or may be sought pursuant to this Article VI on the basis of that representation and warranty by any Person who would have been entitled pursuant to this Article VI to indemnification on the basis of that representation and warranty prior to its termination and expiration, provided that in the case of each representation and warranty that shall terminate and expire as provided in this Section 6.3, no claim presented in writing for indemnification pursuant to this Article VI on the basis of that representation and warranty prior to its termination and expiration shall be affected in any way by that termination and expiration. The indemnification obligations under this Article VI or elsewhere in this Agreement shall apply regardless of whether any suit or action results solely or in part from the active, passive or concurrent negligence or strict liability of the indemnified party.

Section 6.4Demands.

(a) Each indemnified party hereunder agrees that promptly upon its discovery of facts giving rise to a claim for indemnity under the provisions of this Agreement, including receipt by it of notice of any demand, assertion, claim, action or proceeding, judicial or otherwise, by any third party (such claims for indemnity involving third-party claims being collectively referred to herein as the “Third Party Indemnity Claim”), with respect to any matter as to which it claims to be entitled to indemnity under the provisions of this Agreement, it will give prompt notice thereof in writing to the indemnifying party, together with a statement of such information respecting any of the foregoing as it shall have. Such notice shall include a formal demand for indemnification under this Agreement.

(b) Notwithstanding the foregoing, if the indemnified party fails to notify the indemnifying party thereof in accordance with the provisions of this Agreement in sufficient time to permit the indemnifying party or its counsel to defend against a Third Party Indemnity Claim and to make a timely response thereto, the indemnifying party’s indemnity obligation relating to such Third Party Indemnity Claim shall not be relieved except in the event and only to the extent that the indemnifying party is prejudiced or damaged by such failure.

Section 6.5Right to Contest and Defend.

(a) The indemnifying party shall be entitled, at its cost and expense, to contest and defend by all appropriate legal proceedings any Third Party Indemnity Claim for which it is called upon to indemnify the indemnified party under the provisions of this Agreement; provided, that notice of the intention to so contest shall be delivered by the indemnifying party to the indemnified party within thirty (30) days from the date of receipt by the indemnifying party of notice by the indemnified party of the assertion of the Third Party Indemnity Claim. Any such contest may be conducted in the name and on behalf of the indemnifying party or the indemnified party as may be appropriate. Such contest shall be conducted by reputable counsel employed by the indemnifying party and not reasonably objected to by the indemnified party, but the indemnified party shall have the right but not the obligation to participate in such proceedings and to be represented by counsel of its own choosing at its sole cost and expense.

(b) The indemnifying party shall have full authority to determine all action to be taken with respect thereto; provided, however, that the indemnifying party will not have the authority to subject the indemnified party to any obligation whatsoever, other than the performance of purely ministerial tasks or obligations not involving material expense or injunctive relief. If the indemnifying party does not elect to contest any such Third Party Indemnity Claim, the indemnifying party shall be bound by the result obtained with respect thereto by the indemnified party. If the indemnifying party assumes the defense of a Third Party Indemnity Claim, the indemnified party shall agree to any settlement, compromise or discharge of a Third Party Indemnity Claim that the indemnifying party may recommend and that by its terms obligates the indemnifying party to pay the full amount of the liability in connection with such Third Party Indemnity Claim, which releases the indemnified party completely in connection with such Third Party Indemnity Claim and which would not otherwise adversely affect the indemnified party as determined by the indemnified party in its sole discretion.

(c) Notwithstanding the foregoing, the indemnifying party shall not be entitled to assume the defense of any Third Party Indemnity Claim (and shall be liable for the reasonable fees and expenses of counsel incurred by the indemnified party in defending such Third Party Indemnity Claim) if the Third Party Indemnity Claim seeks an order, injunction or other equitable relief or relief for other than money damages against the indemnified party which the indemnified party reasonably determines, after conferring with its outside counsel, cannot be separated from any related claim for money damages. If such equitable relief or other relief portion of the Third Party Indemnity Claim can be so separated from that for money damages, the indemnifying party shall be entitled to assume the defense of the portion relating to money damages.

Section 6.6Cooperation.

If requested by the indemnifying party, the indemnified party agrees to cooperate with the indemnifying party and its counsel in contesting any Third Party Indemnity Claim that the indemnifying party elects to contest or, if appropriate, in making any counterclaim against the person asserting the Third Party Indemnity Claim, or any cross-complaint against any person, and the indemnifying party will reimburse the indemnified party for any expenses incurred by it in so cooperating. At no cost or expense to the indemnified party, the indemnifying party shall cooperate with the indemnified party and its counsel in contesting any Third Party Indemnity Claim.

Section 6.7Right to Participate.

The indemnified party agrees to afford the indemnifying party and its counsel the opportunity to be present at, and to participate in, conferences with all Persons, including Governmental Authorities, asserting any Third Party Indemnity Claim against the indemnified party or conferences with representatives of or counsel for such Persons.

Section 6.8Payment of Damages.

The indemnification required hereunder shall be made by periodic payments of the amount of Damages in connection therewith within ten (10) days as and when reasonably specific bills are received by, or Damages are incurred and reasonable evidence thereof is delivered to, the indemnifying party. In calculating any amount to be paid by an indemnifying party by reason of the provisions of this Agreement, the amount shall be reduced by all insurance proceeds and any indemnification reimbursement proceeds received from third parties credited to or received by the indemnified party related to the Damages.

Section 6.9Direct Claim.

Any claim by an indemnified party with respect to any Damages which do not result from a Third Party Indemnity Claim (a “Direct Claim”) will be asserted by giving the indemnifying party reasonably prompt written notice thereof, stating the nature of such claim in reasonable detail and indicating the estimated amount, if practicable. The indemnifying party will have a period of ninety (90) days from receipt of such Direct Claim within which to respond

to such Direct Claim. If the indemnifying party does not respond within such ninety (90) day period, the indemnifying party will be deemed to have accepted such Direct Claim. If the indemnifying party rejects such Direct Claim, the indemnified party will be free to seek enforcement of its rights to indemnification under this Agreement.

Section 6.10Limitations on Indemnification.

(a) To the extent that the Partnership Indemnified Parties would otherwise be entitled to indemnification for Damages pursuant to Section 6.1(i), Holdings shall be liable only if (i) the Damages with respect to any individual claim exceed $80,000 (the “Minimum Claim Amount”) and (ii) the Damages for all claims that exceed the Minimum Claim Amount exceed, in the aggregate, $4,000,000 (the “Deductible Amount”), and then Holdings shall be liable only for Damages to the extent of any excess over the Deductible Amount. In no event shall Holdings’s aggregate liability to the Partnership Indemnified Parties under Section 6.1 exceed $40,000,000 (the “Ceiling Amount”). Notwithstanding the foregoing, the Minimum Claim Amount, the Deductible Amount and the Ceiling Amount shall not apply to breaches or inaccuracies of representations and warranties contained in the Fundamental Representations.

(b) Additionally, neither TE nor Holdings will be liable as an indemnitor under this Agreement for any consequential, incidental, special, indirect or exemplary damages suffered or incurred by the indemnified party or parties except to the extent resulting pursuant to Third Party Indemnity Claims.

Section 6.11Sole Remedy.

No party shall have liability under this Agreement or the transactions contemplated hereby except as is provided in this Article VI (other than claims or causes of action arising from fraud).

ARTICLE VIIMISCELLANEOUS

Section 7.1Acknowledgments.

Each party acknowledges that it has relied on the representations and warranties of the other party expressly and specifically set forth in this Agreement, including, in the case of Merger Sub, TE and the Partnership, the Disclosure Schedule attached hereto. Such representations and warranties constitute the sole and exclusive representations and warranties of the parties hereto in connection with the transactions contemplated hereby, and the parties hereto understand, acknowledge and agree that all other representations and warranties of any kind or nature, whether expressed, implied or statutory, oral or written, past or present, are specifically disclaimed.

Section 7.2Cooperation; Further Assurances.

Each of the parties shall use their respective commercially reasonable efforts to obtain all approvals and consents required by or necessary for the transactions contemplated by this Agreement. Each of the parties acknowledges that certain actions may be necessary with respect to the matters and actions contemplated by this Agreement such as making notifications and obtaining consents or approvals or other clearances that are material to the consummation of the transactions contemplated hereby, and each agrees to take all appropriate action and to do all things necessary, proper or advisable under Applicable Laws and regulations to make effective the transactions contemplated by this Agreement; provided, however, that nothing in this Agreement will require any party hereto to hold separate or make any divestiture not expressly contemplated herein of any asset or otherwise agree to any restriction on its operations or other burdensome condition which would in any such case be material to its assets, liabilities or business in order to obtain any consent or approval or other clearance required by this Agreement.

Section 7.3Expenses.

Except as otherwise provided herein and regardless of whether the transactions contemplated hereby are consummated, each party shall pay its own expenses incident to this Agreement and all action taken in preparation for carrying this Agreement into effect.

Section 7.4Notices.

Any notice, request, instruction, correspondence or other document to be given hereunder by any party hereto to another party hereto (herein collectively called “Notice”) shall be in writing and delivered in person, by courier service requiring acknowledgment of receipt of delivery or by fax, as follows:

If to Development, addressed to:

Tallgrass Development, LP

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: General Counsel

Tel: (913) 928-6010

Fax: (913) 928-6011

with copies (which shall not constitute notice) to:

Baker Botts L.L.P.

98 San Jacinto Blvd., Suite 1500

Austin, Texas 78701

Attention: Mollie Duckworth

Tel: (512) 322-2551

Fax: (512) 322-8362

If to Holdings, addressed to:

Tallgrass Energy Holdings, LLC

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: General Counsel

Tel: (913) 928-6010

Fax: (913) 928-6011

with copies (which shall not constitute notice) to:

Baker Botts L.L.P.

98 San Jacinto Blvd., Suite 1500

Austin, Texas 78701

Attention: Mollie Duckworth

Tel: (512) 322-2551

Fax: (512) 322-8362

If to Merger Sub, addressed to:

Tallgrass Development Holdings, LLC

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: General Counsel

Tel: (913) 928-6010

Fax: (913) 928-6011

with copies (which shall not constitute notice) to:

Akin Gump Strauss Hauer & Feld LLP

1111 Louisiana Street, 44th Floor

Houston, TX 77002

Attention: John Goodgame

Tel: (713) 220-8144

Fax: (713) 236-0822

If to TE, addressed to:

Tallgrass Equity, LLC

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: General Counsel

Tel: (913) 928-6010

Fax: (913) 928-6011

with copies (which shall not constitute notice) to:

Akin Gump Strauss Hauer & Feld LLP

1111 Louisiana Street, 44th Floor

Houston, TX 77002

Attention: John Goodgame

Tel: (713) 220-8144

Fax: (713) 236-0822

If to the Partnership, addressed to:

Tallgrass Energy GP, LP

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: General Counsel

Tel: (913) 928-6010

Fax: (913) 928-6011

with copies (which shall not constitute notice) to:

Tallgrass Energy GP, LP

4200 W. 115th Street, Suite 350

Leawood, KS 66211

Attention: Conflicts Committee

Tel: (913) 928-6010

Fax: (913) 928-6011

Akin Gump Strauss Hauer & Feld LLP

1111 Louisiana Street, 44th Floor

Houston, TX 77002

Attention: John Goodgame

Tel: (713) 220-8144

Fax: (713) 236-0822

Notice given by personal delivery or courier service shall be effective upon actual receipt. Notice given by fax shall be confirmed by appropriate answer back and shall be effective upon actual receipt if received during the recipient’s normal business hours, or at the beginning of the recipient’s next business day after receipt if not received during the recipient’s normal business hours. Any party may change any address to which Notice is to be given to it by giving Notice as provided above of such change of address.

Section 7.5Governing Law.

(a) This Agreement shall be subject to and governed by the laws of the State of Delaware. Each Party hereby submits to the exclusive jurisdiction of the state and federal courts in the State of Kansas and to venue in the state courts in Johnson County, Kansas and in the federal courts of Wyandotte County, Kansas.

(b) EACH OF THE PARTIES TO THIS AGREEMENT IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING BETWEEN THE PARTIES ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

(c) Each party to this Agreement waives, to the fullest extent permitted by Applicable Law, any right it may have to receive damages from any other party based on any theory of liability for any special, indirect, consequential (including lost profits), exemplary or punitive damages (except to the extent that any such damages are included in indemnifiable losses resulting from a third party claim in accordance with Article VI).

Section 7.6Public Statements.

The parties hereto shall consult with each other and no party shall issue any public announcement or statement with respect to this Agreement or the transactions contemplated hereby without the consent of the other party, unless the party desiring to make such announcement or statement, after seeking such consent from the other parties, obtains advice from legal counsel that a public announcement or statement is required by Applicable Law or stock exchange regulations.

Section 7.7Entire Agreement; Amendments and Waivers.

(a) This Agreement constitutes the entire agreement among the parties with respect to the subject matter hereof and supersede all prior agreements and understandings, both written and oral, among the parties with respect to the subject matter hereof. Each party to this Agreement agrees that no other party to this Agreement (including its agents and representatives) has made any representation, warranty, covenant or agreement to or with such party relating to this Agreement or the transactions contemplated hereby, other than those expressly set forth herein.

(b) No supplement, modification or waiver of this Agreement shall be binding unless executed in writing by each party to be bound thereby. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provision hereof (regardless of whether similar), nor shall any such waiver constitute a continuing waiver unless otherwise expressly provided.

Section 7.8Conflicting Provisions.

This Agreement sets forth the parties’ rights, responsibilities and liabilities with respect to the transactions contemplated by this Agreement. In this Agreement, specific provisions prevail over general provisions.

Section 7.9Binding Effect and Assignment.

This Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective permitted successors and assigns, but neither this Agreement nor any of the rights, benefits or obligations hereunder shall be assigned or transferred, by operation of law or otherwise, by any party hereto without the prior written consent of each other party. Nothing in this Agreement, express or implied, is intended to confer upon any person or entity other than the parties hereto and their respective permitted successors and assigns, any rights, benefits or obligations hereunder, except for express language with respect to the Partnership Indemnified Parties and the Development Indemnified Parties contained in the indemnification provisions of Article VI.

Section 7.10Severability.

If any provision of the Agreement is rendered or declared illegal or unenforceable by reason of any existing or subsequently enacted legislation or by decree of a court of last resort, Merger Sub, TE, the Partnership and Development shall promptly meet and negotiate substitute provisions for those rendered or declared illegal or unenforceable, but all of the remaining provisions of this Agreement shall remain in full force and effect.

Section 7.11Interpretation.

It is expressly agreed by the parties that this Agreement shall not be construed against any party, and no consideration shall be given or presumption made, on the basis of who drafted this Agreement or any provision hereof or who supplied the form of this Agreement. Each party agrees that this Agreement has been purposefully drawn and correctly reflects its understanding of the transactions contemplated by this Agreement and, therefore, waives the application of any law, regulation, holding or rule of construction providing that ambiguities in an agreement or other document will be construed against the party drafting such agreement or document.

Section 7.12Headings and Disclosure Schedule.

The headings of the several Articles and Sections herein are inserted for convenience of reference only and are not intended to be a part of or to affect the meaning or interpretation of this Agreement. The Disclosure Schedule and the Exhibits referred to herein are attached hereto and incorporated herein by this reference, and unless the context expressly requires otherwise, the Disclosure Schedule and such Exhibits are incorporated in the definition of “Agreement.”

Section 7.13Multiple Counterparts.

This Agreement may be executed in one or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Section 7.14Action by the Partnership.

With respect to any action, notice, consent, approval or waiver that is required to be taken or given or that may be taken or given by the Partnership with respect to the transactions contemplated hereby, such action, notice, consent, approval or waiver shall be taken or given by the Conflicts Committee on behalf of the Partnership.

* * * * *

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written above.

DEVELOPMENT:

TALLGRASS DEVELOPMENT, LP

By: Tallgrass Energy Holdings, LLC,
its general partner

By: /s/ David G. Dehaemers, Jr.            

David G. Dehaemers, Jr.
President and Chief Executive Officer

MERGER SUB:

TALLGRASS DEVELOPMENT HOLDINGS, LLC

By: Tallgrass Equity, LLC,
its member

By: /s/ David G. Dehaemers, Jr.            

David G. Dehaemers, Jr.
President and Chief Executive Officer

TE:

TALLGRASS EQUITY, LLC

By: /s/ David G. Dehaemers, Jr.            

David G. Dehaemers, Jr.
President and Chief Executive Officer

THE PARTNERSHIP:

TALLGRASS ENERGY GP, LP

By: TEGP Management, LLC, the general partner of Tallgrass Energy GP, LP

By: /s/ David G. Dehaemers, Jr.            

David G. Dehaemers, Jr.
President and Chief Executive Officer

Executed by Tallgrass Energy Holdings, LLC as of the date first above written, solely for purposes of its obligations and rights under Section 2.7, Article V and Article VI of this Agreement

HOLDINGS:

TALLGRASS ENERGY HOLDINGS, LLC

By: /s/ David G. Dehaemers, Jr.            

David G. Dehaemers, Jr.
President and Chief Executive Officer

Appendix A

Merger Sub, TE, the Partnership and Development Designated Personnel

Development Designated Personnel:

• David G. Dehaemers, Jr.

• William R. Moler

• Gary J. Brauchle

• Christopher R. Jones

Merger Sub’s, TE’s and the Partnership’s Designated Personnel:

• David G. Dehaemers, Jr.

• William R. Moler

• Gary J. Brauchle

• Christopher R. Jones

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 GP, 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer 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 TEGP Management, LLC (the general partner of Tallgrass Energy GP, LP)

Date: May 3, 2018

EX-31.2

Exhibit 31.2

Certification by Chief Financial 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 GP, 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer 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 TEGP Management, LLC (the general partner of Tallgrass Energy GP, LP)

Date: May 3, 2018

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 GP, LP (the “Partnership”) on Form 10-Q for the quarter ended March 31, 2018, 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 TEGP Management, 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 TEGP Management, LLC (the general partner of Tallgrass Energy GP, LP)

Date: May 3, 2018

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 GP, LP (the “Partnership”) on Form 10-Q for the quarter ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gary J. Brauchle, Executive Vice President and Chief Financial Officer of TEGP Management, 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 TEGP Management, LLC (the general partner of Tallgrass Energy GP, LP)

Date: May 3, 2018

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

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 03, 2018
Document Information [Line Items]
Entity Registrant Name	TALLGRASS ENERGY GP, LP
Entity Central Index Key	0001633651
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Trading Symbol	TEGP
Amendment Flag	false
Capital Unit, Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		58,085,002
Capital Unit, Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		126,709,225

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 4,255	$ 2,593
Accounts receivable, net	131,401	118,615
Receivable from related parties	4,472	1,340
Gas imbalances	822	1,990
Inventories	32,147	21,609
Derivative assets	306	0
Prepayments and other current assets	11,020	11,175
Total Current Assets	184,423	157,322
Property, plant and equipment, net	2,498,715	2,394,337
Goodwill	404,838	404,838
Intangible assets, net	136,554	97,731
Unconsolidated investments	1,446,039	909,531
Deferred financing costs, net	11,769	12,563
Deferred tax asset	306,304	312,997
Deferred charges and other assets	5,018	2,694
Total Assets	4,993,660	4,292,013
Current Liabilities:
Accounts payable	121,372	98,882
Accounts payable to related parties	0	5,342
Gas imbalances	1,616	1,663
Derivative liabilities	0	2,368
Accrued taxes	24,181	19,272
Accrued liabilities	37,028	35,707
Deferred revenue	99,922	88,471
Other current liabilities	7,816	7,171
Total Current Liabilities	291,935	258,876
Long-term debt, net	2,426,014	2,292,993
Other long-term liabilities and deferred credits	19,628	18,965
Total Long-term Liabilities	2,445,642	2,311,958
Commitments and Contingencies
Equity [Abstract]
Total Partners' Equity	15,615	48,613
Noncontrolling interests	2,240,468	1,672,566
Total Equity	2,256,083	1,721,179
Total Liabilities and Equity	4,993,660	4,292,013
Common Class A
Equity [Abstract]
Total Partners' Equity	15,615	48,613
Common Class B
Equity [Abstract]
Total Partners' Equity	$ 0	$ 0

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CONDENSED CONSOLIDATED BALANCE SHEETS CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - shares	Mar. 31, 2018	Dec. 31, 2017
Common Class A
Shares, Outstanding	58,085,002	58,085,002
Common Class B
Shares, Outstanding	126,709,225	99,154,440

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Crude oil transportation services	$ 84,738	$ 84,331
Natural gas transportation services	32,196	31,685
Sales of natural gas, NGLs, and crude oil	38,145	15,381
Processing and other revenues	24,015	13,003
Total Revenues	179,094	144,400
Operating Costs and Expenses:
Cost of sales	26,351	12,370
Cost of transportation services	10,420	13,503
Operations and maintenance	16,399	12,903
Depreciation and amortization	26,123	21,403
General and administrative	18,426	14,217
Taxes, other than income taxes	8,879	8,226
Gain on disposal of assets	9,417	1,448
Total Operating Costs and Expenses	97,181	81,174
Operating Income	81,913	63,226
Other Income (Expense):
Equity in earnings of unconsolidated investments	68,402	20,738
Interest expense, net	(29,761)	(16,017)
Other income, net	451	1,955
Total Other Income (Expense)	39,092	6,676
Net income before tax	121,005	69,902
Deferred income tax expense	6,692	2,664
Net income	114,313	67,238
Net income attributable to noncontrolling interests	(97,578)	(55,209)
Net income attributable to TEGP	$ 16,735	$ 12,029
Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per Class A share	$ 0.29	$ 0.21
Diluted net income per Class A share	$ 0.29	$ 0.21
Basic average number of Class A shares outstanding	58,085	58,075
Diluted average number of Class A shares outstanding	58,210	58,165

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Tallgrass Energy Partners	Pony Express Pipeline	Noncontrolling Interest	Noncontrolling Interest Tallgrass Energy Partners	Noncontrolling Interest Pony Express Pipeline	Noncontrolling Interest Terminals and NatGas	Noncontrolling Interest Rockies Express Pipeline LLC	Noncontrolling Interest Deeprock Development, LLC	Total Partner Equity Including Portion Attributable to Noncontrolling Interest	Total Partner Equity Including Portion Attributable to Noncontrolling Interest Tallgrass Energy Partners	Total Partner Equity Including Portion Attributable to Noncontrolling Interest Pony Express Pipeline	Total Partner Equity Including Portion Attributable to Noncontrolling Interest Terminals and NatGas	Total Partner Equity Including Portion Attributable to Noncontrolling Interest Rockies Express Pipeline LLC	Total Partner Equity Including Portion Attributable to Noncontrolling Interest Deeprock Development, LLC	Predecessor Equity	Predecessor Equity Tallgrass Energy Partners	Predecessor Equity Pony Express Pipeline	Predecessor Equity Terminals and NatGas	Predecessor Equity Rockies Express Pipeline LLC	Predecessor Equity Deeprock Development, LLC	Capital Unit, Class B Noncontrolling Interest	Capital Unit, Class B Total Partner Equity Including Portion Attributable to Noncontrolling Interest	Common Class A	Common Class A Tallgrass Energy Partners	Common Class A Pony Express Pipeline	Common Class A Terminals and NatGas	Common Class A Rockies Express Pipeline LLC	Common Class A Deeprock Development, LLC	Common Class B	Common Class B Tallgrass Energy Partners	Common Class B Pony Express Pipeline	Common Class B Terminals and NatGas	Common Class B Rockies Express Pipeline LLC	Common Class B Deeprock Development, LLC
Partners' Capital, Including Portion Attributable to Noncontrolling Interest				$ 1,596,152						$ 1,929,414						$ 82,295								$ 250,967						$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 67,238			55,209						67,238						0								12,029						0
Issuance of TEP units to the public, net of offering costs		$ 99,400			$ 89,353						$ 99,373						$ 0								$ 10,020						$ 0
TEGP distributions to Class A shareholders	(16,116)			0						(16,116)						0								(16,116)						0
Noncash compensation expense				1,882						2,244						0								362						0
TEP LTIP units tendered by employees to satisfy tax withholding obligations					(360)						(400)						0								(40)						0
Acquisitions							$ (36,391)	$ 40,159					$ (140,000)	$ 63,681					$ (82,295)	$ 0							$ (21,314)	$ 23,522					$ 0	$ 0
Contributions from noncontrolling interest				700						710						0								0						0
Distributions to noncontrolling interest	(71,426)		$ 0	(71,400)						(71,426)						0								0						0
Partial exercise of call option				(72,890)						(84,942)						0								(12,052)						0
Contributions from TD				1,451						2,301						0								850						0
Payments for Repurchase of Common Stock		35,335			(31,717)						(35,335)						0								(3,618)						0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest				1,572,132						1,816,742						0								244,610						0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	1,721,179			1,672,566						1,721,179						0								48,613						0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2014-09								39,543						44,131						0								4,588						0
Net income	114,313			97,578						114,313						0								16,735						0
Issuance of TEP units to the public, net of offering costs					(40)						(45)						$ 0								(5)						$ 0
TEGP distributions to Class A shareholders	(21,346)			0						(21,346)						0								21,346						0
Noncash compensation expense				2,917						3,321						0								404						0
Payments for Purchase of Common Stock	(198,000)				$ (189,520)						$ (251,742)														$ (62,222)
Issuance of Tallgrass Equity units																						$ 644,782	$ 644,782
Acquisitions						$ (44,732)		$ 74,421				$ (50,000)		$ 108,537				$ 0		$ 0						$ (5,268)		$ 34,116				$ 0		$ 0
Consolidation of Deeprock North									$ 31,843						$ 31,843						$ 0								$ 0						$ 0
Contributions from noncontrolling interest				183						183						0								0						0
Distributions to noncontrolling interest	(89,073)		$ (50,000)	(89,073)						(89,073)						0								0						0
Payments for Repurchase of Common Stock		$ 0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	$ 2,256,083			$ 2,240,468						$ 2,256,083						$ 0								$ 15,615						$ 0

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 114,313	$ 67,238
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	27,620	23,694
Equity in earnings of unconsolidated investments	(68,402)	(20,738)
Distributions from unconsolidated investments	67,059	20,740
Deferred income tax expense	6,692	2,664
Gain (Loss) on Disposition of Assets	(9,417)	(1,448)
Other noncash items, net	207	(1,621)
Changes in components of working capital
Accounts receivable and other	(12,013)	2,449
Accounts payable and accrued liabilities	16,354	(6,055)
Deferred revenue	10,750	16,202
Other current assets and liabilities	(1,671)	(819)
Other operating, net	108	(140)
Net Cash Provided by Operating Activities	151,600	102,166
Cash Flows from Investing Activities:
Acquisition of BNN North Dakota, net of cash acquired	(95,000)
Capital expenditures	(58,760)	(26,769)
Sale of Tallgrass Crude Gathering	50,046
Distributions from unconsolidated investments in excess of cumulative earnings	20,774	10,079
Acquisition of 38% membership interest in Deeprock North	19,500
Acquisition of Rockies Express membership interest	0	(400,000)
Payments to Acquire Businesses, Gross	0	(140,000)
Other investing, net	(20,473)	(5,352)
Net Cash Used in Investing Activities	(122,913)	(562,042)
Net Cash (Used in) Provided by Financing Activities
Borrowings under revolving credit facilities, net	133,000	552,000
Distributions to noncontrolling interests	(89,073)	(71,426)
TEGP distributions to Class A shareholders	(21,346)	(16,116)
Proceeds from public offering of TEP common units, net of offering costs	0	99,373
Other financing, net	394	3,355
Net Cash (Used in) Provided by Financing Activities	(27,025)	459,470
Net Change in Cash and Cash Equivalents
Net Change in Cash and Cash Equivalents	1,662	(406)
Cash and Cash Equivalents, beginning of period	2,593	2,459
Cash and Cash Equivalents, end of period	4,255	2,053
Supplemental Cash Flow Disclosures
Issuance of Tallgrass Equity units	644,782
Other Significant Noncash Transaction, Value of Consideration Given	393,039
Contribution of 38% membership interest in Deeprock North to Deeprock Development	(19,500)
Issuance of noncontrolling interests in Deeprock Development in exchange for 62% membership interest in Deeprock North	(31,843)
Increase in Accrual for Property Plant and Equipment	1,336	0
Tallgrass Energy Partners
Net Cash (Used in) Provided by Financing Activities
Payments for Repurchase of Common Stock	0	(35,335)
Supplemental Cash Flow Disclosures
Other Significant Noncash Transaction, Value of Consideration Given	251,743
Pony Express Pipeline
Net Cash (Used in) Provided by Financing Activities
Distributions to noncontrolling interests	(50,000)	0
Equity Option
Net Cash (Used in) Provided by Financing Activities
Payments for Repurchase of Common Stock	$ 0	$ (72,381)

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Description of Business

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business

Tallgrass Energy GP, LP ("TEGP" or the "Partnership") is a limited partnership that has elected to be treated as a corporation for U.S. federal income tax purposes. "We," "us," "our" and similar terms refer to TEGP together with its consolidated subsidiaries. TEGP's sole cash-generating asset as of March 31, 2018 is an approximate 31.43% controlling membership interest in Tallgrass Equity, LLC ("Tallgrass Equity"). Tallgrass Equity's cash-generating assets consist of the direct and indirect partnership interests in Tallgrass Energy Partners, LP ("TEP") and its membership interest in Rockies Express Pipeline LLC ("Rockies Express") as described below:

• 100% of the outstanding membership interests in Tallgrass MLP GP, LLC ("TEP GP"), which owns the general partner interest in TEP as well as all the TEP incentive distribution rights ("IDRs"). The general partner interest in TEP is represented by 834,391 general partner units, representing an approximate 1.13% general partner interest in TEP at March 31, 2018.

• 25,619,218 TEP common units, representing an approximate 34.60% limited partner interest in TEP at March 31, 2018, inclusive of the 5,619,218 TEP common units acquired from Tallgrass Development, LP ("TD") as of February 7, 2018 as described below.

• As of February 7, 2018, TD merged into Tallgrass Development Holdings, LLC, a wholly-owned subsidiary of Tallgrass Equity ("Tallgrass Development Holdings"), and as a result of the merger, Tallgrass Equity acquired a 25.01% membership in Rockies Express and an additional 5,619,218 TEP common units. As consideration for the acquisition, TEGP and Tallgrass Equity issued 27,554,785 unregistered TEGP Class B shares and Tallgrass Equity units, valued at approximately $644.8 million, to the limited partners of TD.

TEP is a publicly traded, growth-oriented limited partnership formed to own, operate, acquire and develop midstream energy assets in North America. TEP's operations are 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, Bakken, Marcellus, and Utica shale formations.

Our reportable business segments are:

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

• Crude Oil Transportation—the ownership and operation of a FERC-regulated crude oil pipeline system; and

• Gathering, Processing & Terminalling—the ownership and operation of natural gas gathering and processing facilities; crude oil storage and terminalling facilities; the provision of water business services primarily to the oil and gas exploration and production industry; the transportation of NGLs; and the marketing of crude oil and NGLs.

Natural Gas Transportation. TEP provides natural gas transportation and storage services for customers in the Rocky Mountain, Midwest and Appalachian regions of the United States through: (1) its 49.99% membership interest in Rockies Express, which owns the Rockies Express Pipeline, a FERC-regulated natural gas pipeline system extending from Opal, Wyoming and Meeker, Colorado to Clarington, Ohio (the "Rockies Express Pipeline") and its 100% membership interest in Tallgrass NatGas Operator, LLC ("NatGas"), which operates the Rockies Express Pipeline, (2) the Tallgrass Interstate Gas Transmission system, a FERC-regulated natural gas transportation and storage system located in Colorado, Kansas, Missouri, Nebraska and Wyoming (the "TIGT System"), and (3) the Trailblazer Pipeline system, a FERC-regulated natural gas pipeline system extending from the Colorado and Wyoming border to Beatrice, Nebraska (the "Trailblazer Pipeline"). As discussed in Note 4 – Acquisitions and Dispositions, Tallgrass Equity acquired a 25.01% membership interest in Rockies Express from TD as of February 7, 2018.

Crude Oil Transportation. TEP provides crude oil transportation to customers in Wyoming, Colorado, and the surrounding regions through Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a FERC-regulated crude oil pipeline commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma, and includes a lateral in Northeast Colorado commencing in Weld County, Colorado that interconnects with the pipeline just east of Sterling, Colorado (the "Pony Express System"). In the second quarter of 2018, Pony Express placed into service an extension of the system from a new origin near Platteville, Colorado to the Buckingham Terminal.

Gathering, Processing & Terminalling. TEP provides natural gas gathering and processing services for customers in Wyoming through: (1) a natural gas gathering system in the Powder River Basin (the "Douglas Gathering System"), (2) the Casper and Douglas natural gas processing facilities, and (3) the West Frenchie Draw natural gas treating facility. TEP also provides NGL transportation services in Northeast Colorado and Wyoming. TEP performs water business services, including freshwater transportation and produced water gathering and disposal, in Colorado, Texas, Wyoming, and North Dakota through BNN Water Solutions, LLC ("Water Solutions"), and crude oil storage and terminalling services through TEP's 100% membership interest in Tallgrass Terminals, LLC ("Terminals"), which owns and operates crude oil terminals in Colorado, Oklahoma, and Kansas. The Gathering, Processing & Terminalling segment also includes Stanchion Energy, LLC ("Stanchion"), which transacts in crude oil.

The term "Terminals Predecessor" refers to Terminals and the term "NatGas Predecessor" refers to NatGas prior to their acquisition by TEP on January 1, 2017. Terminals Predecessor and NatGas 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 Terminals Predecessor and NatGas Predecessor prior to January 1, 2017.

TEGP Merger Agreement

On March 26, 2018, we announced the execution of a definitive Agreement and Plan of Merger (the "Merger Agreement") pursuant to which we will acquire the approximately 47.6 million TEP common units held by the public in a share-for-unit merger transaction that is taxable to TEP unitholders for U.S. federal income tax purposes at a ratio of 2.0 Class A shares for each outstanding TEP common unit. As a result of the proposed transaction, TEP's incentive distribution rights will be cancelled, its common units will no longer be publicly traded, and 100% of its equity interests will be owned by Tallgrass Equity and its subsidiaries. Upon closing of the merger transaction, we will change our name to Tallgrass Energy, LP ("Tallgrass Energy") and will trade on the New York Stock Exchange under the ticker symbol "TGE." Tallgrass Energy will continue to be taxed as a corporation for U.S. federal income tax purposes.

The Merger Agreement has been unanimously approved by the board of directors of our general partner, the conflicts committee of the board of directors of TEP GP, and the board of directors of TEP GP. Subject to customary approvals and conditions, including the approval by holders of a majority of the outstanding TEP common units, the merger is expected to close by the end of the second quarter of 2018.

In connection with the proposed transaction, we filed with the Securities and Exchange Commission (“SEC”) a registration statement on Form S-4 that included a preliminary proxy statement/prospectus for the TEP unitholders. The registration statement has not yet been declared effective. The description of the proposed transaction above is not a substitute for the proxy statement/prospectus or registration statement or for any other document that TEGP or TEP may file with the SEC and send to TEGP’s and/or TEP’s shareholders or unitholders in connection with the proposed transaction. Investors and security holders of TEGP and TEP are urged to read the proxy statement/prospectus and other documents filed with the SEC carefully and in their entirety when they become available because they will contain important information. Investors and security holders will be able to obtain free copies of the proxy statement/prospectus and other documents filed with the SEC by TEGP or TEP through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by TEGP and TEP will be available free of charge on TEGP’s and TEP’s website at www.tallgrassenergylp.com, in the "Investor Relations" tab near the top of the page.

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

These condensed consolidated financial statements and related notes for the three months ended March 31, 2018 and 2017 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board's Accounting Standards Codification, the single source of accounting principles generally accepted 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 all disclosures required by GAAP for annual periods. The condensed consolidated financial statements for the three months ended March 31, 2018 and 2017 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair statement 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.

Our financial results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018. The accompanying condensed consolidated interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017 ("2017 Form 10-K") filed with the SEC on February 13, 2018.

The condensed consolidated financial statements include the accounts of TEGP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net income or loss from consolidated subsidiaries that are not wholly-owned by TEGP is attributed to TEGP and noncontrolling interests in accordance with the respective ownership interests.

TEP closed the acquisition of Terminals and NatGas effective January 1, 2017. As the acquisitions of Terminals and NatGas are considered transactions between entities under common control, and a change in reporting entity, the financial information presented has been recast to include Terminals and NatGas for all periods presented.

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. We have presented separately in our condensed consolidated balance sheets, to the extent material, the liabilities of our consolidated VIEs for which creditors do not have recourse to our general credit. Our consolidated VIEs do not have material assets that can only be used to settle specific obligations of the consolidated VIEs. Tallgrass Equity is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, we have determined that we are the primary beneficiary as we have the right to receive benefits of Tallgrass Equity that could potentially be significant to Tallgrass Equity. TEP is also considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis, we have determined that TEP GP is the primary beneficiary of TEP and we continue to consolidate TEP accordingly.

Use of Estimates

Certain amounts included in or affecting these condensed 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 our 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 Pronouncement Recently Adopted

Revenue Recognition

In May 2014, the FASB issued Accounting Standards Update ("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.

Management has completed its evaluation and implemented the revised guidance using the modified retrospective method as of January 1, 2018. This approach allows us to apply the new standard to (i) all new contracts entered into after January 1, 2018 and (ii) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to members' equity. Consolidated revenues presented in the comparative consolidated financial statements for periods prior to January 1, 2018 will not be revised.

On January 1, 2018, we recorded a cumulative effect adjustment to equity of $44.1 million, increased the carrying amount of our investment in Rockies Express by $42.8 million, and recognized a receivable from Rockies Express of $1.3 million. These adjustments relate to the cumulative effect adjustment recorded by Rockies Express of $125.2 million upon adoption of ASC 606. The cumulative effect adjustment at Rockies Express arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas during the periods prior to implementation.

Through our review process, we also identified the following changes to our revenue recognition policies that did not result in a cumulative effect adjustment on January 1, 2018:

• Gathering & Processing. We have determined that a number of our gathering & processing contracts at TMID do not represent customer arrangements under ASC 606. Instead, arrangements deemed to represent wellhead purchases of raw gas will be accounted for as supply arrangements pursuant to ASC 705. As a result, gathering & processing fees previously recognized in revenue will be reported as a reduction to cost of sales under ASC 606.

• Pipeline Loss Allowance. We have determined that pipeline loss allowance, or PLA, collected under certain crude oil transportation arrangements is a component of the transaction price where the PLA both significantly exceeds actual losses and was negotiated with the intent of providing a revenue stream to TEP. Under ASC 606, PLA barrels retained from customers will be subject to the guidance for noncash consideration and recognized in revenue at their contract inception fair value.

See Note 12 – Revenue from Contracts with Customers for revenue disclosures related to both the implementation and the additional requirements prescribed by the standard. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is (or will be) recognized and data related to contract assets and liabilities.

Accounting Pronouncements Not Yet Adopted

ASU No. 2016-02, "Leases (Topic 842)"

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02 provides a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP.

Management is currently evaluating the impact of our pending adoption of ASC 842. The status of our implementation is as follows:

• Management has formed an implementation team that meets to discuss implementation challenges, technical interpretations, industry-specific treatment of certain contract types, and project status.

• Management is in the process of gathering data and reviewing contracts in order to identify all impacted contracts.

• Management is evaluating the potential information technology and internal control changes that will be required for adoption based on the findings from its contract review process.

• Management plans to provide internal training and awareness related to the revised guidance to the key stakeholders throughout its organization.

The amendments in ASU 2016-02 are effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within that reporting period. Early application is permitted. We are currently evaluating the impact of ASU 2016-02.

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Variable Interest Entity

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entity

TEP is a VIE of which TEP GP, our consolidated subsidiary, is the primary beneficiary. We continue to consolidate TEP accordingly. We have not provided any additional financial support other than TEP GP's initial capital contribution to acquire the general partner interest in TEP and have no contractual commitments or obligations to provide additional financial support to TEP.

TEGP, as the managing member of Tallgrass Equity, has voting rights disproportionate to its ownership interest. As a result, we have determined that Tallgrass Equity is a VIE of which we are the primary beneficiary and we consolidate Tallgrass Equity accordingly. We have not provided any additional financial support to Tallgrass Equity other than our initial capital contribution to acquire a portion of our controlling interest in Tallgrass Equity and have no contractual commitments or obligations to provide additional financial support to Tallgrass Equity.

Other than TEGP's deferred tax asset of approximately $306.3 million and $313.0 million at March 31, 2018 and December 31, 2017, respectively, the assets and liabilities included in our condensed consolidated balance sheets at March 31, 2018 and December 31, 2017 represent the consolidated assets and liabilities of Tallgrass Equity, including the assets and liabilities of TEP.

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Acquisitions & Dispositions

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Acquisitions

Acquisition of an Additional 25.01% Membership Interest in Rockies Express and Additional TEP Common Units

In February 2018, TD merged into Tallgrass Development Holdings, a wholly-owned subsidiary of Tallgrass Equity, and as a result of the merger, Tallgrass Equity acquired a 25.01% membership interest in Rockies Express and an additional 5,619,218 TEP common units. As consideration for the acquisition, TEGP and Tallgrass Equity issued 27,554,785 unregistered TEGP Class B shares and Tallgrass Equity units, valued at approximately $644.8 million based on the closing price on February 6, 2018, to the limited partners of TD. Subsequent to the closing of the transaction, our aggregate membership interest in Rockies Express is 75%.

The transfer of the Rockies Express membership interest between TD and Tallgrass Equity is considered a transaction between entities under common control, but does not represent a change in reporting entity. As a result of the common control nature of the transaction, the acquisition resulted in the recognition of a noncash deemed contribution representing the excess carrying value of the 25.01% membership interest in Rockies Express acquired over the fair value of the consideration paid. For further discussion, see Note 11 - Partnership Equity and Distributions. As the aggregate 75% membership interest does not represent a controlling interest in Rockies Express, TEGP's investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As a result of the common control nature of the transaction, the 25.01% membership interest in Rockies Express was transferred to Tallgrass Equity at TD's historical carrying amount, including the remaining unamortized basis difference driven by the difference between the fair value of the investment and the book value of the underlying assets and liabilities on November 13, 2012, the date of acquisition by TD. For additional information, see Note 8 - Investments in Unconsolidated Affiliates.

The acquisition of an additional 5,619,218 TEP common units is considered an acquisition of noncontrolling interest and resulted in the recognition of a noncash deemed distribution representing the excess purchase price over the $53.8 million carrying value of the 5,619,218 TEP units acquired as of February 7, 2018. For further discussion, see Note 11 - Partnership Equity and Distributions.

As of February 7, 2018, the negative basis difference in Rockies Express carried over from TD was approximately $376.5 million. The amount of the basis difference allocated to property, plant and equipment is accreted over 35 years, which equates to the 2.86% composite depreciation rate utilized by Rockies Express to depreciate the underlying property, plant and equipment. The amount allocated to long-term debt is amortized over the remaining life of the various debt facilities. At March 31, 2018, the basis difference for the membership interests acquired by TEP in May 2016 and March 2017, and by Tallgrass Equity in February 2018 were allocated as follows:

	Basis Difference			Amortization Period
	(in thousands)
Long-term debt	$	48,455		2 - 25 years
Property, plant and equipment	(1,175,719		)	35 years
Total basis difference	$	(1,127,264	)

TEP Sale of Tallgrass Crude Gathering

In February 2018, TEP entered into an agreement with an affiliate of Silver Creek Midstream, LLC ("Silver Creek") to sell its 100% membership interest in Tallgrass Crude Gathering, LLC ("TCG"), which owns a 50-mile crude oil gathering system in the Powder River Basin, for approximately $50.0 million. The sale of TCG closed on February 23, 2018. During the three months ended March 31, 2018, TEP recognized a gain of $9.4 million on the sale which is presented in the line item "Gain on disposal of assets" in the condensed consolidated statements of income.

Iron Horse Joint Venture

In February 2018, TEP entered into an agreement with Silver Creek to form Iron Horse Pipeline, LLC ("Iron Horse"), a new joint venture pipeline to transport crude oil from the Powder River Basin. During the three months ended March 31, 2018, TEP contributed an initial $3.5 million and committed to funding its proportionate share of the remaining costs of construction in exchange for a 75% membership interest in Iron Horse. TEP's investment in Iron Horse is accounted for under the equity method of accounting and reported as "Unconsolidated investments" on the condensed consolidated balance sheets.

TEP Acquisition of Additional 2% Membership Interest in Pony Express

In February 2018, TEP acquired the remaining 2% membership interest in Pony Express, along with administrative assets consisting primarily of information technology assets, from TD for cash consideration of approximately $60 million, bringing its aggregate membership interest in Pony Express to 100%. The acquisition of the remaining 2% 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 has not been recast to reflect the additional 2% membership interest. The transaction resulted in a deemed distribution of $16.2 million to TEP GP.

TEP Acquisition of BNN North Dakota

In January 2018, TEP acquired 100% of the membership interests in Buckhorn Energy Services, LLC and Buckhorn SWD Solutions, LLC, which were subsequently merged and renamed BNN North Dakota, LLC ("BNN North Dakota"), for approximately $95.0 million, net of cash acquired, subject to working capital adjustments. BNN North Dakota owns a produced water gathering and disposal system in the Bakken basin with approximately 133,000 acres under dedication. The transaction qualifies as an acquisition of a business and is accounted for as a business combination under ASC 805.

The following represents the fair value of assets acquired and liabilities assumed (in thousands):

Accounts receivable	$	2,457
Inventory	67
Property, plant and equipment	48,900
Intangible asset	46,800			(1)
Accounts payable and accrued liabilities	(3,224		)
Net identifiable assets acquired (excluding cash)	$	95,000

⁽¹⁾  The $46.8 million intangible asset acquired represents three major customer relationships. This intangible asset is amortized on a straight-line basis over a period of 8 - 14 years, the remaining terms of the underlying contracts at the time of acquisition.

At March 31, 2018, 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 identifying and measuring 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. Actual revenue and net income attributable to TEGP from BNN North Dakota of $3.1 million and $0.2 million, respectively, was recognized in the accompanying condensed consolidated statements of income for the period from January 12, 2018 to March 31, 2018.

Pro Forma Financial Information

Unaudited pro forma revenue and net income attributable to TEGP for the three months ended March 31, 2018 and 2017 is presented below as if the acquisition of BNN North Dakota had been completed on January 1, 2017.

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	179,522	$	146,716
Net income attributable to TEGP	$	16,761	$	11,939

The pro forma financial information is not necessarily indicative of what the actual results of operations or financial position of TEGP would have been if the transaction had in fact occurred on the date or for the period indicated, nor does it purport to project the results of operations or financial position of TEGP 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 transaction or the costs to achieve these cost savings, operating synergies, and revenue enhancements.

Acquisition of Deeprock North and Merger with Deeprock Development

In January 2018, Terminals acquired an approximate 38% membership interest in Deeprock North, LLC ("Deeprock North") from Kinder Morgan Deeprock North Holdco LLC for cash consideration of $19.5 million. Immediately following the acquisition, Deeprock North was merged into Deeprock Development, LLC ("Deeprock Development"), and the members of Deeprock North and Deeprock Development received adjusted membership interests in the combined entity. As a result, Terminals recognized additional noncontrolling interests in Deeprock Development of $31.8 million. The acquisition of Deeprock North by Deeprock Development has been accounted for as an asset acquisition, with substantially all of the fair value allocated to the long-lived assets acquired based on their relative fair values. After the acquisition and merger, Terminals owns an approximate 60% membership interest in the combined entity.

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Related Party Transactions

3 Months Ended

Mar. 31, 2018

Related Party Transactions [Abstract]

Related Party Transactions

As a result of our relationship with Tallgrass Energy Holdings, LLC ("Tallgrass Energy Holdings") and its affiliates, we have entered into a number of related party transactions. The following disclosure includes those related party transactions which are not otherwise disclosed in these notes to our condensed consolidated financial statements.

We have no employees. In connection with the closing of the TEP initial public offering on May 17, 2013, TEP and its general partner entered into an Omnibus Agreement with Tallgrass Energy Holdings and certain of its affiliates (the "TEP Omnibus Agreement"). The TEP Omnibus Agreement provides that, among other things, TEP will reimburse Tallgrass Energy Holdings 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 Tallgrass Energy Holdings and its affiliates, 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. In addition, in connection with the closing of our initial public offering on May 12, 2015 (the "TEGP IPO"), TEGP entered into an Omnibus Agreement (the "TEGP Omnibus Agreement") with TEGP Management, LLC, Tallgrass Equity and Tallgrass Energy Holdings.

Totals of transactions with affiliated companies, excluding transactions disclosed elsewhere in these notes, are as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Processing and other revenues (1)	$	1,896	$	1,632
Cost of transportation services (2)	$	—	$	4,507
Charges to TEGP: (3)
Property, plant and equipment, net	$	—	$	293
Operations and maintenance	$	—	$	6,277
General and administrative	$	—	$	9,573

⁽¹⁾  Reflects the fee that NatGas receives as the operator of the Rockies Express Pipeline.

⁽²⁾  Reflects rent expense for the crude oil storage at the Deeprock Terminal prior to our consolidation of Deeprock Development during the third quarter of 2017.

⁽³⁾  Charges to TEGP, inclusive of Tallgrass Equity and TEP, include indirectly charged wages and salaries, other compensation and benefits, and shared services for periods prior to January 1, 2018. Effective January 1, 2018, these costs are incurred by TEP directly and, in the case of certain employee compensation and benefits, paid on TEP's behalf by its affiliate, Tallgrass Management, LLC pursuant to the TEP Omnibus Agreement.

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

	March 31, 2018		December 31, 2017
	(in thousands)
Receivable from related parties:
Rockies Express Pipeline LLC	$	4,324	$	1,340
Iron Horse Pipeline, LLC	148		—
Total receivable from related parties	$	4,472	$	1,340
Accounts payable to related parties:
Tallgrass Operations, LLC (1)	$	—	$	5,342
Total accounts payable to related parties	$	—	$	5,342

⁽¹⁾  Reflects accounts payable for charges to TEGP, inclusive of Tallgrass Equity and TEP, including indirectly charged wages and salaries, other compensation and benefits, and shared services prior to January 1, 2018 as discussed above.

Gas imbalances with affiliated shippers are as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Affiliate gas imbalance receivables	$	13	$	18
Affiliate gas imbalance payables	$	269	$	442

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Inventory

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventory

The components of inventory at March 31, 2018 and December 31, 2017 consisted of the following:

	March 31, 2018		December 31, 2017
	(in thousands)
Crude oil	$	21,517	$	12,792
Materials and supplies	5,914		5,891
Natural gas liquids	607		942
Gas in underground storage	4,109		1,984
Total inventory	$	32,147	$	21,609

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Property, Plant and Equipment

3 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	March 31, 2018			December 31, 2017
	(in thousands)
Crude oil pipelines	$	1,252,262		$	1,220,379
Gathering, processing and terminalling assets (1)	744,515			675,092
Natural gas pipelines	585,483			581,400
General and other	118,355			98,680
Construction work in progress	112,464			97,978
Accumulated depreciation and amortization	(314,364		)	(279,192		)
Total property, plant and equipment, net	$	2,498,715		$	2,394,337

⁽¹⁾  Includes approximately $46.2 million and $40.1 million of assets associated with the acquisitions of Deeprock North and BNN North Dakota, respectively, in January 2018.

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Investments in Unconsolidated Affiliates - (Notes)

3 Months Ended

Mar. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments and Joint Ventures Disclosure

Our investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. During the three months ended March 31, 2018, we recognized equity in earnings associated with our aggregate 75% membership interest in Rockies Express of $67.1 million, inclusive of the amortization of the negative basis difference, and received distributions from and made contributions to Rockies Express of $87.8 million and $3.2 million, respectively. As discussed in Note 4 - Acquisitions and Dispositions, Tallgrass Equity acquired an additional 25.01% membership interest in Rockies Express in February 2018.

Summarized financial information for Rockies Express is as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	230,058	$	201,338
Operating income	$	128,678	$	107,369
Net income to Members	$	90,968	$	66,250

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Risk Management

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Risk Management

We enter into derivative contracts with third parties for the purpose of hedging exposures that accompany our normal business activities. Our normal business activities directly and indirectly expose us to risks associated with changes in the market price of crude oil and natural gas, among other commodities. For example, the risks associated with changes in the market price of crude oil and natural gas include, among others (i) pre-existing or anticipated physical crude oil and natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. We have 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 our derivative contracts included in the condensed consolidated balance sheets:

	Balance Sheet Location	March 31, 2018		December 31, 2017
		(in thousands)
Crude oil derivative contracts (1)	Current assets	$	306	$	—
Crude oil derivative contracts (1)	Current liabilities	$	—	$	2,368

⁽¹⁾  As of March 31, 2018, the fair value shown for crude oil derivative contracts represents the forward sale of 242,000 barrels which will settle throughout the second quarter of 2018. As of December 31, 2017, the fair value shown for crude oil derivative contracts represents the forward sale of 356,000 barrels of crude oil which settled in the first quarter of 2018.

Effect of Derivative Contracts in the Statements of Income

The following table summarizes the impact of derivative contracts not designated as hedging contracts for the three months ended March 31,2018 and 2017:

	Location of gain recognized in income on derivatives	Amount of gain recognized in income on derivatives
		Three Months Ended March 31,
		2018		2017
		(in thousands)
Derivatives not designated as hedging contracts:
Crude oil derivative contracts	Sales of natural gas, NGLs, and crude oil	$	4,295	$	663
Natural gas derivative contracts	Sales of natural gas, NGLs, and crude oil	$	—	$	173
Call option derivative	Other income, net	$	—	$	1,885

Call Option Derivative

As part of TEP's acquisition of an additional 31.3% membership interest in Pony Express effective January 1, 2016, TD granted TEP an 18 month call option at an exercise price of $42.50 per TEP common unit covering the 6,518,000 TEP common units issued to TD as a portion of the consideration. On February 1, 2017, TEP exercised the remainder of the call option covering an additional 1,703,094 common units for a cash payment of $72.4 million. These common units were deemed canceled upon the exercise of the call option and as of the applicable exercise date were no longer issued and outstanding.

Credit Risk

We have counterparty credit risk as a result of our use of derivative contracts. Counterparties to our commodity derivatives consist of market participants and major financial institutions. This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions. The counterparty to our call option derivative was TD.

Our derivative contracts are entered into with counterparties through central trading organizations such as futures, options or stock exchanges or counterparties outside of central trading organizations. While we typically enter into derivative transactions with investment grade counterparties and actively monitor 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 our crude oil derivative contracts at March 31, 2018 was:

	Asset Position
	(in thousands)
Gross	$	306
Netting agreement impact	—
Cash collateral held	—
Net exposure	$	306

As of March 31, 2018 and December 31, 2017, we had $0.8 million and $3.0 million, respectively, of cash in margin accounts and outstanding letters of credit in support of our commodity derivative contracts.

Fair Value

Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). OTC commodity 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. We use 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. The call option granted by TD was valued using a Black-Scholes option pricing model. Key inputs to the valuation model included the term of the option, risk free rate, the exercise price and current market price, expected volatility and expected distribution yield of the underlying units. The call option valuation was classified within Level 2 of the fair value hierarchy as the value was based on significant observable inputs.

The following table summarizes the fair value measurements of our derivative contracts as of March 31, 2018 and December 31, 2017, based on the fair value hierarchy:

			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)
As of March 31, 2018:
Crude oil derivative contracts	$	306	$	—	$	306	$	—
			Liability 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)
As of December 31, 2017:
Crude oil derivative contracts	$	2,368	$	—	$	2,368	$	—

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Long-term Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-term Debt

Long-term debt consisted of the following at March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Tallgrass Equity revolving credit facility	$	124,000		$	146,000
TEP revolving credit facility	816,000			661,000
TEP 5.50% senior notes due September 15, 2024	750,000			750,000
TEP 5.50% senior notes due January 15, 2028	750,000			750,000
Less: Deferred financing costs, net (1)	(17,628		)	(17,737		)
Plus: Unamortized premium on 2028 Notes	3,642			3,730
Total long-term debt, net	$	2,426,014		$	2,292,993

⁽¹⁾  Deferred financing costs, net as presented above relate solely to the 2024 and 2028 Notes. Deferred financing costs associated with our revolving credit facilities are presented in noncurrent assets on our condensed consolidated balance sheets.

TEP Senior Unsecured Notes due 2028

On September 15, 2017, TEP and Tallgrass Energy Finance Corp. (the "Co-Issuer" and together with TEP, the "Issuers"), the Guarantors named therein and U.S. Bank, National Association, as trustee, entered into an Indenture dated September 15, 2017 (the "2028 Indenture") pursuant to which the Issuers issued $500 million in aggregate principal amount of 5.50% senior notes due 2028 (the "2028 Notes"). On December 11, 2017, the Issuers issued an additional $250 million in aggregate principal amount of the 2028 Notes, which are also governed by the 2028 Indenture. The notes issued on September 15, 2017 and December 11, 2017 are treated as a single class of debt securities and have identical terms, other than the issue date and offering price.

The 2028 Indenture contains covenants that, among other things, limit TEP's ability and the ability of its restricted subsidiaries to: (i) create liens to secure indebtedness; (ii) enter into sale-leaseback transactions; and (iii) consolidate with or merge with or into, or sell substantially all TEP’s properties to, another person. As of March 31, 2018, TEP was in compliance with the covenants required under the 2028 Notes.

TEP Senior Unsecured Notes due 2024

On September 1, 2016, the Issuers, the Guarantors named therein and U.S. Bank, National Association, as trustee, entered into an Indenture dated September 1, 2016 (the "2024 Indenture"), pursuant to which the Issuers issued $400 million in aggregate principal amount of 5.50% senior notes due 2024 (the "2024 Notes"). On May 16, 2017, the Issuers issued an additional $350 million in aggregate principal amount of the 2024 Notes which are also governed by the 2024 Indenture. The notes issued on September 1, 2016 and May 16, 2017 are treated as a single class of debt securities and have identical terms, other than the issue date, offering price and first interest payment date. 

The 2024 Indenture contains covenants that, among other things, limit TEP's ability and the ability of its restricted subsidiaries to: (i) incur, assume or guarantee additional indebtedness or issue preferred units; (ii) create liens to secure indebtedness; (iii) pay distributions on equity interests in the event of default or noncompliance with the covenants required, repurchase equity securities or redeem subordinated securities; (iv) make investments; (v) restrict distributions, loans or other asset transfers from TEP's restricted subsidiaries; (vi) consolidate with or merge with or into, or sell substantially all of TEP's properties to, another person; (vii) sell or otherwise dispose of assets, including equity interests in subsidiaries; and (viii) enter into transactions with affiliates. As of March 31, 2018, TEP was in compliance with the covenants required under the 2024 Notes.

Tallgrass Equity Revolving Credit Facility

The following table sets forth the available borrowing capacity under the Tallgrass Equity revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the Tallgrass Equity revolving credit facility	$	150,000		$	150,000
Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility	(124,000		)	(146,000		)
Available capacity under the Tallgrass Equity revolving credit facility	$	26,000		$	4,000

In connection with the TEGP IPO, Tallgrass Equity entered into a $150 million senior secured revolving credit facility with Barclays Bank PLC, as administrative agent, and a syndicate of lenders, which will mature on May 12, 2020. Among various other covenants and restrictive provisions, Tallgrass Equity is required to maintain a total leverage ratio of not more than 3.00 to 1.00. As of March 31, 2018, Tallgrass Equity was 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 of 0.50%. As of March 31, 2018, the weighted average interest rate on outstanding borrowings under the Tallgrass Equity revolving credit facility was 4.38%. During the three months ended March 31, 2018, Tallgrass Equity's weighted average effective interest rate, including the interest on outstanding borrowings, commitment fees, and amortization of deferred financing costs, was 4.47%.

TEP Revolving Credit Facility

The following table sets forth the available borrowing capacity under the TEP revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the TEP revolving credit facility	$	1,750,000		$	1,750,000
Less: Outstanding borrowings under the TEP revolving credit facility	(816,000		)	(661,000		)
Less: Letters of credit issued under the TEP revolving credit facility	(94		)	(94		)
Available capacity under the TEP revolving credit facility	$	933,906		$	1,088,906

TEP's 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 its 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 therefrom, change the nature of its 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 5.00 to 1.00 (which will be increased to 5.50 to 1.00 for certain measurement periods following the consummation of certain acquisitions), a consolidated senior secured leverage ratio of not more than 3.75 to 1.00 and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2018, TEP was in compliance with the covenants required under its revolving credit facility.

The unused portion of TEP's revolving credit facility is subject to a commitment fee, which ranges from 0.250% to 0.500%, based on TEP's total leverage ratio. As of March 31, 2018, the weighted average interest rate on outstanding borrowings under the TEP revolving credit facility was 3.27%. During the three months ended March 31, 2018, the weighted average effective interest rate under the TEP revolving credit facility, including the interest on outstanding borrowings under TEP's revolving credit facility, commitment fees, and amortization of deferred financing costs, was 3.53%.

Fair Value

The following table sets forth the carrying amount and fair value of our long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2018 and December 31, 2017, 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)
As of March 31, 2018:
Revolving credit facilities	$	—	$	940,000	$	—	$	940,000	$	940,000
2024 Notes	$	—	$	767,063	$	—	$	767,063	$	740,202
2028 Notes	$	—	$	754,425	$	—	$	754,425	$	745,812
As of December 31, 2017:
Revolving credit facilities	$	—	$	807,000	$	—	$	807,000	$	807,000
2024 Notes	$	—	$	771,645	$	—	$	771,645	$	739,824
2028 Notes	$	—	$	758,168	$	—	$	758,168	$	746,169

The long-term debt borrowed under the revolving credit facilities is carried at amortized cost. As of March 31, 2018 and December 31, 2017, the fair value of borrowings under the revolving credit facilities approximates the carrying amount of the borrowings using a discounted cash flow analysis. The 2024 and 2028 Notes are carried at amortized cost, net of deferred financing costs. The estimated fair value of the 2024 and 2028 Notes is based upon quoted market prices adjusted for illiquid markets. We are not aware of any factors that would significantly affect the estimated fair value subsequent to March 31, 2018.

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Partnership Equity and Distributions

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Partnership Equity and Distributions

TEGP Distributions to Holders of Class A Shares

The following table details the distributions for the periods indicated:

Three Months Ended	Date Paid	Distributions to Class A Shareholders		Distributions per Class A Share
		(in thousands)
March 31, 2018	May 15, 2018 (1)	$	28,316	$	0.4875
December 31, 2017	February 14, 2018	21,346		0.3675
September 30, 2017	November 14, 2017	20,617		0.3550
June 30, 2017	August 14, 2017	19,891		0.3425
March 31, 2017	May 15, 2017	16,697		0.2875

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to Class A shareholders of record at the close of business on April 30, 2018.

Subsidiary Distributions

TEP Distributions. The following table shows the distributions for the periods indicated:

		Distributions								Distribution per Limited Partner Common Unit
		Limited Partner Common Units		General Partner
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2018	May 15, 2018 (1)	$	71,370	$	39,816	$	1,267	$	112,453	$	0.9750
December 31, 2017	February 14, 2018	70,638		39,125		1,251		111,014		0.9650
September 30, 2017	November 14, 2017	69,174		37,744		1,219		108,137		0.9450
June 30, 2017	August 14, 2017	67,671		36,342		1,186		105,199		0.9250
March 31, 2017	May 15, 2017	60,486		29,840		1,040		91,366		0.8350

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to unitholders of record at the close of business on April 30, 2018.

Exchange Rights

Our current Class B shareholders (collectively, the "Exchange Right Holders") own an equal number of Tallgrass Equity units. The Exchange Right Holders, and any permitted transferees of their Tallgrass Equity units, each have the right to exchange all or a portion of their Tallgrass Equity units for Class A shares at an exchange ratio of one Class A share for each Tallgrass Equity unit exchanged, which we refer to as the Exchange Right. The Exchange Right may be exercised only if, simultaneously therewith, an equal number of our Class B shares are transferred by the exercising party to us. Upon such exchange, we will cancel the Class B shares received from the exercising party.

TEP Equity Distribution Agreements

TEP has active equity distribution agreements pursuant to which it may sell from time to time through a group of managers, as its sales agents, TEP common units representing limited partner interests having an aggregate offering price of up to $100.2 million and $657.5 million. Net cash proceeds from any sale of the TEP common units may be used for general partnership purposes, which includes, among other things, TEP's exercise of the call option with respect to the 6,518,000 common units issued to TD in connection with TEP's acquisition of an additional 31.3% of Pony Express in January 2016, repayment or refinancing of debt, funding for acquisitions, capital expenditures and additions to working capital. During the three months ended March 31, 2018, TEP did not issue any common units under its equity distribution agreements.

During the three months ended March 31, 2017, TEP issued and sold 2,087,647 common units with a weighted average sales price of $48.23 per unit under its equity distribution agreements for net cash proceeds of approximately $99.4 million (net of approximately $1.3 million in commissions and professional service expenses).

Repurchase of TEP Common Units Owned by TD

Following an offer received from TD with respect to TEP common units owned by TD not subject to the call option, TEP repurchased 736,262 TEP common units from TD at an aggregate price of approximately $35.3 million, or $47.99 per common unit, on February 1, 2017, which was approved by the conflicts committee of the board of directors of TEP's general partner. These common units were deemed canceled upon our purchase and as of such transaction date were no longer issued and outstanding.

Noncontrolling Interests

As of March 31, 2018, noncontrolling interests in our subsidiaries consisted of a 68.57% interest in Tallgrass Equity held by the Exchange Right Holders, the 64.27% limited partner interest in TEP held by the public TEP unitholders, and a 40% membership interest in Deeprock Development. During the three months ended March 31, 2018, we recognized contributions from and distributions to noncontrolling interests of $0.2 million and $89.1 million, respectively. Contributions from noncontrolling interests consisted primarily of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $51.3 million, Tallgrass Equity distributions to the Exchange Right Holders of $36.4 million, and distributions to Deeprock and Pony Express noncontrolling interests of $1.3 million.

During the three months ended March 31, 2017, we recognized contributions from and distributions to noncontrolling interests of $0.7 million and $71.4 million, respectively. Contributions from noncontrolling interests consisted primarily of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $42.5 million, Tallgrass Equity distributions to the Exchange Right Holders of $27.5 million and distributions to Pony Express noncontrolling interests of $1.4 million.

Other Contributions and Distributions

During the three months ended March 31, 2018, TEGP recognized the following other contributions and distributions:

• TEGP was deemed to have made a noncash capital distribution of $198.0 million, which represents the excess purchase price over the $53.8 million carrying value of the 5,619,218 TEP units acquired as of February 7, 2018; and

• TEGP was deemed to have received a noncash capital contribution of $108.5 million, which represents the excess carrying value of the 25.01% membership interest in Rockies Express acquired as of February 7, 2018 over the fair value of the consideration paid.

During the three months ended March 31, 2017, TEGP recognized the following other contributions and distributions:

• TEP received contributions from TD of $2.3 million primarily to indemnify TEP for costs associated with Trailblazer's Pipeline Integrity Management Program, as discussed in Note 15 – Legal and Environmental Matters.

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Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customers

Implementation of ASC Topic 606

As discussed in Note 2 – Summary of Significant Accounting Policies, we adopted the guidance in ASC Topic 606 effective January 1, 2018 using the modified retrospective method of adoption. As a result, revenue reported for the three months ended March 31, 2017 has not been revised. The following tables provide the impact of the guidance on our condensed consolidated balance sheet as of March 31, 2018 and the condensed consolidated statement of income for the three months ended March 31, 2018:

	March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Unconsolidated investments	$	1,446,039	$	1,392,894	$	53,145	(1)

	Three Months Ended March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Crude oil transportation services	$	84,738	$	84,466	$	272		(2)
Sales of natural gas, NGLs, and crude oil	$	38,145	$	39,245	$	(1,100	)	(3)
Processing and other revenues	$	24,015	$	25,525	$	(1,510	)	(1)(3)
Cost of sales	$	26,351	$	28,845	$	(2,494	)	(2)(3)
Equity in earnings of unconsolidated investments	$	68,402	$	58,123	$	10,279		(1)
Net income attributable to TEGP	$	16,735	$	15,053	$	1,682
Basic net income per Class A share	$	0.29	$	0.26	$	0.03
Diluted net income per Class A share	$	0.29	$	0.26	$	0.03

⁽¹⁾  Reflects the impact on our investment in Rockies Express and the management fee collected by NatGas of the cumulative effect adjustment at Rockies Express, which arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas.

⁽²⁾  Reflects the impact to revenue and cost of sales to value PLA barrels collected under certain crude oil transportation arrangements at their contract inception fair value in revenue and record an associated lower of cost or net realizable value adjustment in cost of sales.

⁽³⁾  Reflects the reclassification of certain gathering and processing fees collected under arrangements determined to be supply arrangements, rather than customer arrangements under ASC 606, to cost of sales and the reclassification of certain commodities retained as consideration for processing services to processing fee revenue.

Disaggregated Revenue

A summary of our revenue by line of business is as follows:

	Three Months Ended March 31, 2018
	Natural Gas Transportation segment		Crude Oil Transportation segment		Gathering, Processing, & Terminalling segment		Corporate and Other			Total Revenue
	(in thousands)
Crude oil transportation - committed shipper revenue	$	—	$	84,738	$	—	$	—		$	84,738
Natural gas transportation - firm service	33,334		—		—		(1,883		)	31,451
Water business services	—		—		13,204		—			13,204
Natural gas gathering & processing fees	—		—		5,044		—			5,044
All other (1)	2,630		3,319		5,706		(6,088		)	5,567
Total service revenue	35,964		88,057		23,954		(7,971		)	140,004
Natural gas liquids sales	—		—		23,609		—			23,609
Natural gas sales	238		—		7,847		—			8,085
Crude oil sales	—		1,909		247		—			2,156
Total commodity sales revenue	238		1,909		31,703		—			33,850
Total revenue from contracts with customers	36,202		89,966		55,657		(7,971		)	173,854
Other revenue (2)	—		—		8,181		(2,941		)	5,240
Total revenue (3)	$	36,202	$	89,966	$	63,838	$	(10,912	)	$	179,094

⁽¹⁾  Includes revenue from crude oil terminal services, interruptible natural gas transportation and storage, and natural gas park and loan service.

⁽²⁾  Includes lease and derivative revenue not subject to ASC 606.

⁽³⁾  Excludes $230.1 million of revenue recognized at Rockies Express for the three months ended March 31, 2018. See Note 8 – Investments in Unconsolidated Affiliates for additional information about our investment in Rockies Express.

Performance Obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC Topic 606. A contract's transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation and are billed and collected monthly.

All of our segments engage in commodity sales, in which our performance obligations include an obligation to deliver the specified volume of a commodity to the designated receipt point. Revenue from commodity sales is recognized at a point in time when the customer obtains control of the commodity, typically upon delivery to the designated delivery point when the customer accepts and takes possession of the commodity.

In the Natural Gas Transportation segment, our performance obligations typically include an obligation to stand ready to provide natural gas transportation, storage, or an integrated transportation and storage service over the life of the contract, which is a series. These performance obligations are satisfied over time using each day of service to measure progress toward satisfaction of the performance obligation.

In the Crude Oil Transportation segment, our performance obligations typically include an obligation to provide crude oil transportation services over the life of the contract, which is a series. These performance obligations are satisfied over time using barrels delivered to measure progress toward satisfaction of the performance obligation.

In the Gathering, Processing & Terminalling segment, the performance obligations vary based on the operating asset and type of contract. In our natural gas gathering and processing arrangements, performance obligations typically include an obligation to provide an integrated processing service over the life of the contract, which is a series. These performance obligations are satisfied over time using each unit of gas processed to measure progress toward satisfaction of the performance obligation. In our freshwater supply arrangements, performance obligations typically include an obligation to deliver a specified volume of water to the designated receipt point. These performance obligations are satisfied at a point in time when the customer obtains control of the water. In our produced water gathering and disposal arrangements, performance obligations typically include an obligation to provide an integrated produced water gathering and disposal service over the life of the contract, which is a series. These performance obligations are satisfied over time using barrels disposed to measure progress toward satisfaction of the performance obligation.

On March 31, 2018, we had $1.7 billion of remaining performance obligations at our consolidated subsidiaries, which we refer to as total backlog. Total backlog includes performance obligations under long-term crude oil transportation contracts with committed shippers, natural gas firm transportation and firm storage contracts, and certain water business service contracts with minimum volume commitments, and excludes variable consideration that is not estimated at contract inception, as discussed further below. We expect to recognize the total backlog during the remainder of 2018 and future periods as follows (in thousands):

Year	Estimated Revenue
2018	$	387,826
2019	488,919
2020	317,235
2021	138,686
2022	129,548
Thereafter	271,311
Total	$	1,733,525

Contract Estimates

Accounting for long-term contracts involves the use of various techniques to estimate total contract revenue. Contract estimates are based on various assumptions to project the outcome of future events that often span several years. These assumptions include the anticipated volumes of crude oil expected to be delivered by our customers for transport in future periods.

The nature of our contracts gives rise to several types of variable consideration, including PLA, volumetric charges for actual volumes delivered, overrun charges, and other fees that are contingent on the actual volumes delivered by our customers. As the amount of variable consideration is allocable to each distinct performance obligation within the series of performance obligations that comprise the single performance obligation, we do not estimate the total variable consideration for the single overall performance obligation because the uncertainty related to the consideration is resolved each month as the distinct service is provided. Consequently, we are able to include in the transaction price each month the actual amount of variable consideration because no uncertainty exists surrounding the services provided that month.

Certain of our contracts include provisions in which a portion of the consideration is noncash. In our Crude Oil Transportation segment, we collect PLA from our customers. As crude oil is transported, we earn, and take title to, a portion of the oil transported for our services. Any PLA that remains after replacing losses in transit can be sold. Where PLA is determined to be a component of compensation for the transportation services provided, crude oil retained is recognized in revenue at its contract inception fair value. In our Gathering, Processing & Terminalling segment, we retain commodity products as consideration under certain of our gathering and processing arrangements. Processing fee revenue is recorded when the performance obligation is completed based on the value of the product received at the time services are performed. At this time, the variability of the non-cash consideration related to both form (price) and other-than-form (volume and product mix), which are interrelated, is resolved.

As a significant change in one or more of these estimates could affect the amount and timing of revenue recognized under our customer contracts, we review and update our contract-related estimates regularly.

Contract Balances

The timing of revenue recognition, billings, and cash collections may result in billed accounts receivable, unbilled receivables (contract assets), and deferred revenue (contract liabilities) on our condensed consolidated balance sheets. Revenue is generally billed and collected monthly based on services provided or commodity volumes sold. In our Crude Oil Transportation segment, we recognize shipper deficiencies, or deferred revenue, for barrels committed by the customer to be transported in a month but not physically received by us for transport or delivered to the customers' agreed upon destination point. These shipper deficiencies are charged at the committed tariff rate per barrel and recorded as a contract liability until the barrels are physically transported and delivered, or when the likelihood that the customer will utilize the deficiency balance becomes remote. We also recognize contract liabilities, in the form of deferred revenue, under certain water business services contracts in the Gathering, Processing & Terminalling segment. Contract balances as of March 31, 2018 were as follows:

	March 31, 2018		January 1, 2018
	(in thousands)
Accounts receivable from contracts with customers	$	68,039	$	61,888
Other accounts receivable	63,362		56,727
Accounts receivable, net	$	131,401	$	118,615
Deferred revenue from contracts with customers (1)	$	99,922	$	88,471

⁽¹⁾  Revenue recognized during the three months ended March 31, 2018 that was included in the deferred revenue balance at the beginning of the period was $3.1 million. This revenue primarily represented the utilization of shipper deficiencies at Pony Express.

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Net Income per Class A Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Income per Class A Share

Basic net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding Class A shares during the period. Class B shares do not share in the earnings of the Partnership. Accordingly, basic and diluted net income per Class B share has not been presented.

Diluted net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding diluted Class A shares during the period. For purposes of calculating diluted net income per Class A share, we considered the impact of possible future exercises of the Exchange Right by the Exchange Right Holders on both net income attributable to TEGP and the diluted weighted average number of Class A shares outstanding. The Exchange Right Holders refers to the group of persons who collectively own all TEGP's outstanding Class B shares and an equivalent number of Tallgrass Equity units. The Exchange Right Holders are entitled to exercise the right to exchange their Tallgrass Equity units (together with an equivalent number of TEGP Class B shares) for TEGP Class A shares at an exchange ratio of one TEGP Class A share for each Tallgrass Equity unit exchanged, which we refer to as the Exchange Right. The Exchange Right Holders primarily consist of Kelso & Company and its affiliated investment funds, The Energy & Minerals Group and its affiliated investment funds, and Tallgrass KC, LLC, which is an entity owned by certain members of TEGP's and TEP's management.

Pursuant to the TEGP partnership agreement and the Tallgrass Equity limited liability company agreement, our capital structure and the capital structure of Tallgrass Equity will generally replicate one another in order to maintain the one-for-one exchange ratio between the Tallgrass Equity units and Class B shares, on the one hand, and our Class A shares, on the other hand. As a result, the exchange of any Class B shares for Class A shares does not have a dilutive effect on basic net income per Class A share.

The following table illustrates the calculation of net income per Class A share for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018		2017
	(in thousands, except per unit amounts)
Basic Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Basic weighted average Class A Shares outstanding	58,085		58,075
Basic net income per Class A share	$	0.29	$	0.21
Diluted Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares	69		8
Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares	$	16,804	$	12,037
Basic weighted average Class A Shares outstanding	58,085		58,075
Equity Participation Shares equivalent shares	125		90
Diluted weighted average Class A Shares outstanding	58,210		58,165
Diluted net income per Class A Share	$	0.29	$	0.21

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Regulatory Matters

3 Months Ended

Mar. 31, 2018

Regulated Operations [Abstract]

Regulatory Matters

There are no regulatory proceedings challenging the rates of Pony Express, Rockies Express, Tallgrass Interstate Gas Transmission, LLC ("TIGT") or Trailblazer Pipeline Company LLC ("Trailblazer"). We have made certain regulatory filings with the FERC, including the following:

Pony Express

On May 22, 2017 and May 31, 2017, Pony Express made tariff filings with the FERC in Docket Nos. IS17-263-000, IS17-464-000, and IS17-465-000 to increase the contract and non-contract rates by an amount reflecting the most recent FERC annual index adjustment of approximately 0.2%, which became effective July 1, 2017.

On November 30, 2017, Pony Express filed with the FERC in Docket No. IS18-60-000 certain changes to its tariffs to reflect the addition of two new destination points, which became effective January 1, 2018.

On December 29, 2017, Pony Express filed with the FERC in Docket No. IS18-113-000 certain changes to its tariffs to reflect a new origin point in Rooks County, Kansas, which became effective on February 1, 2018.

On February 28, 2018, Pony Express filed with the FERC in Docket No. IS18-199-000 certain changes to its tariffs to reflect a new origin point in Platteville, Colorado, which became effective on April 1, 2018.

On March 1, 2018, Pony Express submitted proposed revisions to its Rules and Regulations Tariff in Docket No. IS18-204-000 to establish the right to accept "Specialty Batches" of oil that do not conform to the Quality Specifications reflected in the tariff, provided that the acceptance is operationally feasible. These tariff changes became effective on April 1, 2018.

On April 11, 2018, Pony Express filed with the FERC in Docket No. IS18–267–000 certain changes to its tariffs to reflect additional contract rates from a new origin point in Platteville, Colorado, which are proposed to become effective on May 1, 2018.

Rockies Express

Rockies Express Zone 3 Capacity Enhancement Project – FERC Docket No. CP15-137-000

On March 31, 2015 in Docket No. CP15-137-000, Rockies Express filed with the FERC an application for authorization to construct and operate (1) three new mainline compressor stations located in Pickaway and Fayette Counties, Ohio and Decatur County, Indiana; (2) additional compressors at an existing compressor station in Muskingum County, Ohio; and (3) certain ancillary facilities. The facilities increased the Rockies Express Zone 3 east-to-west mainline capacity by 0.8 Bcf/d. Pursuant to the FERC's obligations under the National Environmental Policy Act, FERC staff issued an Environmental Assessment for the project on August 31, 2015. On February 25, 2016, the FERC issued a Certificate of Public Convenience and Necessity authorizing Rockies Express to proceed with the project. On March 14, 2016, Rockies Express commenced construction of the project facilities. The project was placed in-service for the full 0.8 Bcf/d on January 6, 2017.

Electric Power Charge Clarification - FERC Docket No. RP17-285

On December 21, 2016, in Docket No. RP17-285, Rockies Express proposed certain revisions to the General Terms and Conditions of its tariff to clarify that the electric power costs associated with the operation of gas coolers installed in association with the Zone 3 Capacity Enhancement Project at both electric and gas powered stations, will be included in the Power Cost Tracker. Several shippers submitted comments on the proposal. The FERC issued an order on January 19, 2017 accepting the proposed revisions permitting the recovery of electric power costs from the operation of both gas and electric powered compressor stations, subject to certain clarifications.

2017 Annual and Interim FERC Fuel Tracking Filings - FERC Docket Nos. RP17-401 and RP17-1064

On February 13, 2017, in Docket No. RP17-401, Rockies Express made its annual fuel and power cost tracker filing with a proposed effective date of April 1, 2017. The FERC issued an order accepting the filing, including certain requested waivers, on March 21, 2017. On September 20, 2017, Rockies Express made its interim fuel tracker filing in Docket No. RP17-1064 with a proposed effective date of November 1, 2017. The FERC issued an order accepting the filing on October 18, 2017.

Increased Frequency of FL&U and PCT Adjustments - FERC Docket No. RP18-228

On December 1, 2017, in Docket No. RP18-228, Rockies Express made a filing with the FERC to increase the frequency in which it may adjust fixed fuel and lost and unaccounted for retainages and power cost tracker charges during the year so that its recovery of fixed fuel and lost and unaccounted for charges and power costs more closely track usage. Rockies Express proposed an effective date of April 1, 2018. The comment period ended on December 13, 2017, and no parties opposed Rockies Express’ filing. On April 4, 2018, the FERC issued a letter order accepting Rockies Express’s proposal, subject to certain modifications. Rockies Express submitted a compliance filing reflecting the approved tariff provisions and requested modifications on April 10, 2018. No comments on the compliance filing were submitted by the comment deadline of April 16, 2018. On April 18, 2018, the FERC issued an order accepting Rockies Express’s compliance filing effective April 19, 2018.

2018 Annual FERC Fuel Tracking Filing - FERC Docket No. RP18-453

On February 20, 2018, in Docket No. RP18-453, Rockies Express made its annual fuel and power cost tracker filing with a proposed effective date of April 1, 2018. The FERC issued an order accepting the filing on March 19, 2018.

Cheyenne Hub Enhancement Project - FERC Docket CP18-103

On March 2, 2018, Rockies Express submitted an application pursuant to section 7(c) of the Natural Gas Act for a certificate of public convenience and necessity authorizing the construction and operation of certain booster compressor units and ancillary facilities located at the Cheyenne Hub in Weld County, Colorado that will enable Rockies Express to provide a new hub service allowing for firm receipts and deliveries between Rockies Express and certain other interconnected pipelines at the Cheyenne Hub. Rockies Express filed this certificate application in conjunction with a concurrently filed certificate application by Cheyenne Connector, LLC ("Cheyenne Connector") for the Cheyenne Connector Pipeline Project further described below. The comment period for the Cheyenne Hub Enhancement Project closed on April 9, 2018. To date, various comments have been filed by market participants regarding the proposed project.

Cheyenne Connector

Cheyenne Connector Pipeline Project - FERC Docket CP18-102

On March 2, 2018, Cheyenne Connector, an indirect wholly-owned subsidiary of TEP, submitted an application pursuant to section 7(c) of the Natural Gas Act for a certificate of public convenience and necessity to construct and operate a 70-mile 36 inch pipeline to transport natural gas from multiple gas processing plants in Weld County, Colorado to Rockies Express’s Cheyenne Hub. The comment period for the Cheyenne Connector Pipeline Project closed on April 9, 2018. To date, various comments have been filed by market participants regarding the proposed project.

TIGT

General Rate Case Filing - FERC Docket No. RP16-137-000, et seq.

On October 30, 2015, in Docket No. RP16-137-000, et seq., TIGT filed a general rate case with the FERC pursuant to Section 4 of the National Gas Act ("NGA"). The general rate case was ultimately resolved via settlement, which the FERC approved on November 2, 2016, and a compliance filing that modernized TIGT's FERC Gas Tariff, consistent with prior FERC orders, which the FERC accepted on March 16, 2017. Per the terms of the settlement, TIGT is required to file a new general rate case on May 1, 2019 (provided that such rate case is not pre-empted by a pre-filing settlement).

2017 Annual Fuel Tracker Filing - FERC Docket No. RP17-428-000

On February 27, 2017, in Docket No. RP17-428-000, TIGT made its annual fuel tracker filing with a proposed effective date of April 1, 2017. The filing incorporated the FL&U tracker and power cost tracker mechanisms agreed to in the TIGT Rate Case Settlement. The FERC accepted the filing on March 21, 2017.

Electric Power Charge Clarification - FERC Docket No. RP17-1051-000

On September 15, 2017, in Docket No. RP17-1051-000, TIGT proposed certain revisions to its tariff to clarify, amongst other things, that the electric power costs associated with the operation of gas coolers at both electric and gas powered stations are properly included in the Power Cost Tracker. The FERC issued an order on October 3, 2017 accepting the proposed revisions.

2018 Annual Fuel Tracker Filing - FERC Docket No. RP18-533-000

On March 1, 2018, in Docket No. RP18-533-000, TIGT made its annual fuel tracker filing with a proposed effective date of April 1, 2018. The FERC accepted the filing on March 22, 2018.

Trailblazer

2017 Annual and Interim Fuel Tracker Filings - FERC Docket Nos. RP17-549-000 and RP17-1052-000

On March 22, 2017, in Docket No. RP17-549-000, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2017. The FERC accepted the filing on April 19, 2017. On September 15, 2017, Trailblazer made its interim fuel tracker filing in Docket No. RP17-1052-000 with a proposed effective date of November 1, 2017. The FERC accepted the filing on October 13, 2017.

2018 Annual Fuel Tracker Filing - FERC Docket No. RP18-580-000

On March 22, 2018, in Docket No. in Docket No. RP18-580-000, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2018. The FERC accepted the filing on April 20, 2018.

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Legal and Environmental Matters

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Legal and Environmental Matters

Legal

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

We have evaluated claims in accordance with the accounting guidance for contingencies that we deem both probable and reasonably estimable and, accordingly, have recorded no reserve for legal claims as of March 31, 2018 or December 31, 2017.

Rockies Express

Ultra Resources

In early 2016, Ultra Resources, Inc. ("Ultra") defaulted on its firm transportation service agreement for approximately 0.2 Bcf/d through November 11, 2019. In late March 2016, Rockies Express terminated Ultra's service agreement. On April 14, 2016, Rockies Express filed a lawsuit against Ultra for breach of contract and damages in Harris County, Texas, seeking approximately $303 million in damages and other relief. On April 29, 2016, Ultra and certain of its debtor affiliates filed for protection under Chapter 11 of the United States Bankruptcy Code in United States Bankruptcy Court for the Southern District of Texas, which operated as a stay of the Harris County state court proceeding.

On January 12, 2017, Rockies Express and Ultra entered into an agreement to settle Rockies Express' approximately $303 million claim against Ultra. In accordance with the settlement agreement, Ultra made a cash payment to Rockies Express of $150 million on July 12, 2017, and entered into a new, seven-year firm transportation agreement with Rockies Express commencing December 1, 2019, for west-to-east service of 0.2 Bcf/d at a rate of approximately $0.37 per dth/d, or approximately $26.8 million annually. TEP received its proportionate distribution from the cash settlement payment in July 2017.

Environmental, Health and Safety

We are 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. We believe that compliance with these laws will not have a material adverse impact on our 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 us to incur significant costs. We had environmental reserves of $7.7 million at March 31, 2018 and December 31, 2017.

Rockies Express

Seneca Lateral

On January 31, 2018, Rockies Express experienced an operational disruption on its Seneca Lateral due to a pipe rupture and natural gas release in a rural area in Noble County, Ohio. There were no injuries reported and no evacuations. The release required Rockies Express to shut off the flow through the segment until February 27, 2018, when temporary repairs were completed allowing the segment to be placed back into service. Total cost of remediation is expected to be approximately $4.8 million prior to any insurance recoveries. A root cause investigation is ongoing.

TMID

Casper Plant, EPA Notice of Violation

In August 2011, the 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, Tallgrass Midstream, LLC ("TMID") received a letter from the 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 EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including the expected inclusion of TIGT as a party to any possible settlement as a result of TIGT owning a compressor that is located adjacent to the Casper Gas Plant site.

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.

TMG

Archibald Booster Station

Tallgrass Midstream Gathering, LLC ("TMG") is currently a party to a remedy agreement entered into with the WDEQ in July 2013 with respect to the Archibald Booster Station located in Campbell County, Wyoming. In connection with the remedy agreement, TMG has agreed to complete certain remedial actions at the site related to a former earthen pit including semi-annual groundwater sampling, and quarterly recovery activities at monitoring wells. The facility is currently in compliance with the WDEQ under the remedy agreement.

Irwin Booster Station

TMG is also party to a remedy agreement entered into with the WDEQ in July 2013 with respect to the Irwin Booster Station located in Converse County, Wyoming. In connection with the remedy agreement, TMG has agreed to complete certain remedial actions at the site related to a former earthen pit including semi-annual groundwater sampling. The facility is currently in compliance with the WDEQ under the remedy agreement.

Trailblazer

Pipeline Integrity Management Program

Starting in 2014 Trailblazer's operating capacity was decreased as a result of smart tool surveys that identified approximately 25 - 35 miles of pipe as potentially requiring repair or replacement. During 2016 and 2017, Trailblazer incurred approximately $21.8 million of remediation costs to address this issue, including replacing approximately 8 miles of pipe. To date the pressure and capacity reduction has not prevented Trailblazer from fulfilling its firm service obligations at existing subscription levels or had a material adverse financial impact on us. However, Trailblazer intends to continue performing remediation to increase and maximize its operating capacity over the long-term and expects to spend in excess of $20 million during 2018 for this pipe replacement and remediation work. Trailblazer is exploring all possible cost recovery options to recover expenditures, including recovery through a general rate increase, negotiated rate agreements with its customers, or other FERC-approved recovery mechanisms.

In connection with TEP's acquisition of Trailblazer in April 2014, TD agreed to indemnify TEP for certain out of pocket costs related to repairing or remediating the Trailblazer Pipeline. The contractual indemnity was capped at $20 million and subject to a $1.5 million deductible. TEP received the entirety of the $20 million from TD pursuant to the contractual indemnity as of December 31, 2017.

Pony Express

Pipeline Integrity

In connection with certain crack tool runs on the Pony Express System completed in 2015, 2016, and 2017, Pony Express completed approximately $18 million of remediation for anomalies identified on the Pony Express System associated with the initial conversion and commissioning of portions of the pipeline converted from natural gas to crude oil service. Remediation work is substantially complete as of March 31, 2018.

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Reporting Segments

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Reporting Segments

Our operations are located in the United States. We are organized into three reportable segments: (1) Natural Gas Transportation, (2) Crude Oil Transportation, and (3) Gathering, Processing & Terminalling.

Natural Gas Transportation

The Natural Gas Transportation segment is engaged in the ownership and operation of FERC-regulated interstate natural gas pipelines and an integrated natural gas storage facility that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. The Natural Gas Transportation segment includes our aggregate 75% membership interest in Rockies Express, inclusive of the additional 25.01% membership interest acquired effective February 7, 2018.

Crude Oil Transportation

The Crude Oil Transportation segment is engaged in the ownership and operation of the Pony Express System, which is a FERC-regulated crude oil pipeline serving the Bakken Shale, Denver-Julesburg and Powder River Basins, and other nearby oil producing basins. The Pony Express System also includes a lateral pipeline in Northeast Colorado, which interconnects with the Pony Express System just east of Sterling, Colorado, and an extension of the system from a new origin near Platteville, Colorado ending at the Buckingham Terminal.

Gathering, Processing & Terminalling

The Gathering, Processing & Terminalling segment is engaged in the ownership and operation of natural gas gathering and processing facilities that produce NGLs and residue gas sold in local wholesale markets or delivered into pipelines for transportation to additional end markets; our crude oil terminal services; water business services provided primarily to the oil and gas exploration and production industry; the transportation of NGLs; and Stanchion.

Corporate and Other

Corporate and Other includes corporate overhead costs that are not directly associated with the operations of our reportable segments, such as interest and fees associated with our revolving credit facilities and the 2024 and 2028 Notes, public company costs, 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.

The following tables set forth our segment information for the periods indicated:

	Three Months Ended March 31, 2018							Three Months Ended March 31, 2017
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
	(in thousands)
Natural Gas Transportation	$	36,202	$	(1,858	)	$	34,344	$	36,428	$	(1,445	)	$	34,983
Crude Oil Transportation	89,966		(3,319		)	86,647		84,994		—			84,994
Gathering, Processing & Terminalling	63,838		(5,735		)	58,103		27,307		(2,884		)	24,423
Corporate and Other	—		—			—		—		—			—
Total revenue	$	190,006	$	(10,912	)	$	179,094	$	148,729	$	(4,329	)	$	144,400

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
Operating Income:	Total Operating Income			Inter- Segment			External Operating Income			Total Operating Income			Inter- Segment			External Operating Income
	(in thousands)
Natural Gas Transportation	$	19,384		$	(2,255	)	$	17,129		$	18,168		$	(1,445	)	$	16,723
Crude Oil Transportation	46,527			4,150			50,677			43,725			4,228			47,953
Gathering, Processing & Terminalling	23,305			(1,895		)	21,410			5,106			(2,783		)	2,323
Corporate and Other	(7,303		)	—			(7,303		)	(3,773		)	—			(3,773		)
Total Operating Income	$	81,913		$	—		$	81,913		$	63,226		$	—		$	63,226
Reconciliation to Net Income:
Equity in earnings of unconsolidated investments							68,402									20,738
Interest expense, net							(29,761		)							(16,017		)
Other income, net							451									1,955
Net income before tax							$	121,005								$	69,902

	Three Months Ended March 31,
Capital Expenditures:	2018		2017
	(in thousands)
Natural Gas Transportation	$	9,885	$	4,655
Crude Oil Transportation	16,952		7,343
Gathering, Processing & Terminalling	31,139		14,771
Corporate and Other	784		—
Total capital expenditures	$	58,760	$	26,769

Assets:	March 31, 2018		December 31, 2017
	(in thousands)
Natural Gas Transportation	$	2,143,693	$	1,606,666
Crude Oil Transportation	1,412,650		1,407,758
Gathering, Processing & Terminalling	1,095,410		943,340
Corporate and Other	341,907		334,249
Total assets	$	4,993,660	$	4,292,013

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Subsequent Events (Notes)

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Pawnee Terminal

On January 2, 2018, Terminals entered into an agreement to acquire a 51% membership interest in the Pawnee, Colorado crude oil terminal ("Pawnee Terminal") from Zenith Energy Terminals Holdings, LLC for cash consideration of approximately $31 million. The transaction closed on April 1, 2018.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

These condensed consolidated financial statements and related notes for the three months ended March 31, 2018 and 2017 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board's Accounting Standards Codification, the single source of accounting principles generally accepted 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 all disclosures required by GAAP for annual periods. The condensed consolidated financial statements for the three months ended March 31, 2018 and 2017 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair statement 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.

Our financial results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2018. The accompanying condensed consolidated interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017 ("2017 Form 10-K") filed with the SEC on February 13, 2018.

Consolidation

The condensed consolidated financial statements include the accounts of TEGP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net income or loss from consolidated subsidiaries that are not wholly-owned by TEGP is attributed to TEGP and noncontrolling interests in accordance with the respective ownership interests.

TEP closed the acquisition of Terminals and NatGas effective January 1, 2017. As the acquisitions of Terminals and NatGas are considered transactions between entities under common control, and a change in reporting entity, the financial information presented has been recast to include Terminals and NatGas for all periods presented.

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. We have presented separately in our condensed consolidated balance sheets, to the extent material, the liabilities of our consolidated VIEs for which creditors do not have recourse to our general credit. Our consolidated VIEs do not have material assets that can only be used to settle specific obligations of the consolidated VIEs. Tallgrass Equity is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, we have determined that we are the primary beneficiary as we have the right to receive benefits of Tallgrass Equity that could potentially be significant to Tallgrass Equity. TEP is also considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis, we have determined that TEP GP is the primary beneficiary of TEP and we continue to consolidate TEP accordingly.

Use of Estimates

Use of Estimates

Certain amounts included in or affecting these condensed 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 our 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.

Revenue Recognition, Policy

Revenue Recognition

In May 2014, the FASB issued Accounting Standards Update ("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.

Management has completed its evaluation and implemented the revised guidance using the modified retrospective method as of January 1, 2018. This approach allows us to apply the new standard to (i) all new contracts entered into after January 1, 2018 and (ii) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to members' equity. Consolidated revenues presented in the comparative consolidated financial statements for periods prior to January 1, 2018 will not be revised.

On January 1, 2018, we recorded a cumulative effect adjustment to equity of $44.1 million, increased the carrying amount of our investment in Rockies Express by $42.8 million, and recognized a receivable from Rockies Express of $1.3 million. These adjustments relate to the cumulative effect adjustment recorded by Rockies Express of $125.2 million upon adoption of ASC 606. The cumulative effect adjustment at Rockies Express arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas during the periods prior to implementation.

Through our review process, we also identified the following changes to our revenue recognition policies that did not result in a cumulative effect adjustment on January 1, 2018:

• Gathering & Processing. We have determined that a number of our gathering & processing contracts at TMID do not represent customer arrangements under ASC 606. Instead, arrangements deemed to represent wellhead purchases of raw gas will be accounted for as supply arrangements pursuant to ASC 705. As a result, gathering & processing fees previously recognized in revenue will be reported as a reduction to cost of sales under ASC 606.

• Pipeline Loss Allowance. We have determined that pipeline loss allowance, or PLA, collected under certain crude oil transportation arrangements is a component of the transaction price where the PLA both significantly exceeds actual losses and was negotiated with the intent of providing a revenue stream to TEP. Under ASC 606, PLA barrels retained from customers will be subject to the guidance for noncash consideration and recognized in revenue at their contract inception fair value.

See Note 12 – Revenue from Contracts with Customers for revenue disclosures related to both the implementation and the additional requirements prescribed by the standard. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is (or will be) recognized and data related to contract assets and liabilities.

Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

ASU No. 2016-02, "Leases (Topic 842)"

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02 provides a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP.

Management is currently evaluating the impact of our pending adoption of ASC 842. The status of our implementation is as follows:

• Management has formed an implementation team that meets to discuss implementation challenges, technical interpretations, industry-specific treatment of certain contract types, and project status.

• Management is in the process of gathering data and reviewing contracts in order to identify all impacted contracts.

• Management is evaluating the potential information technology and internal control changes that will be required for adoption based on the findings from its contract review process.

• Management plans to provide internal training and awareness related to the revised guidance to the key stakeholders throughout its organization.

The amendments in ASU 2016-02 are effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within that reporting period. Early application is permitted. We are currently evaluating the impact of ASU 2016-02.

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Acquisitions & Dispositions - Equity Method Investments (Policies)

3 Months Ended

Mar. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments, Policy

As the aggregate 75% membership interest does not represent a controlling interest in Rockies Express, TEGP's investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As a result of the common control nature of the transaction, the 25.01% membership interest in Rockies Express was transferred to Tallgrass Equity at TD's historical carrying amount, including the remaining unamortized basis difference driven by the difference between the fair value of the investment and the book value of the underlying assets and liabilities on November 13, 2012, the date of acquisition by TD.

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Acquisitions & Dispositions - Business Combinations (Tables)

3 Months Ended

Mar. 31, 2018

Business Acquisition [Line Items]

Equity Method Investments

Summarized financial information for Rockies Express is as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	230,058	$	201,338
Operating income	$	128,678	$	107,369
Net income to Members	$	90,968	$	66,250

Business Acquisition, Pro Forma Information

Unaudited pro forma revenue and net income attributable to TEGP for the three months ended March 31, 2018 and 2017 is presented below as if the acquisition of BNN North Dakota had been completed on January 1, 2017.

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	179,522	$	146,716
Net income attributable to TEGP	$	16,761	$	11,939

BNN North Dakota

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following represents the fair value of assets acquired and liabilities assumed (in thousands):

Accounts receivable	$	2,457
Inventory	67
Property, plant and equipment	48,900
Intangible asset	46,800			(1)
Accounts payable and accrued liabilities	(3,224		)
Net identifiable assets acquired (excluding cash)	$	95,000

⁽¹⁾  The $46.8 million intangible asset acquired represents three major customer relationships. This intangible asset is amortized on a straight-line basis over a period of 8 - 14 years, the remaining terms of the underlying contracts at the time of acquisition.

Rockies Express Pipeline LLC

Business Acquisition [Line Items]

Equity Method Investments

At March 31, 2018, the basis difference for the membership interests acquired by TEP in May 2016 and March 2017, and by Tallgrass Equity in February 2018 were allocated as follows:

	Basis Difference			Amortization Period
	(in thousands)
Long-term debt	$	48,455		2 - 25 years
Property, plant and equipment	(1,175,719		)	35 years
Total basis difference	$	(1,127,264	)

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Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2018

Related Party Transactions [Abstract]

Schedule of Transactions with Affiliated Companies

Totals of transactions with affiliated companies, excluding transactions disclosed elsewhere in these notes, are as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Processing and other revenues (1)	$	1,896	$	1,632
Cost of transportation services (2)	$	—	$	4,507
Charges to TEGP: (3)
Property, plant and equipment, net	$	—	$	293
Operations and maintenance	$	—	$	6,277
General and administrative	$	—	$	9,573

⁽¹⁾  Reflects the fee that NatGas receives as the operator of the Rockies Express Pipeline.

⁽²⁾  Reflects rent expense for the crude oil storage at the Deeprock Terminal prior to our consolidation of Deeprock Development during the third quarter of 2017.

⁽³⁾  Charges to TEGP, inclusive of Tallgrass Equity and TEP, include indirectly charged wages and salaries, other compensation and benefits, and shared services for periods prior to January 1, 2018. Effective January 1, 2018, these costs are incurred by TEP directly and, in the case of certain employee compensation and benefits, paid on TEP's behalf by its affiliate, Tallgrass Management, LLC pursuant to the TEP Omnibus Agreement.

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 parties" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Receivable from related parties:
Rockies Express Pipeline LLC	$	4,324	$	1,340
Iron Horse Pipeline, LLC	148		—
Total receivable from related parties	$	4,472	$	1,340
Accounts payable to related parties:
Tallgrass Operations, LLC (1)	$	—	$	5,342
Total accounts payable to related parties	$	—	$	5,342

⁽¹⁾  Reflects accounts payable for charges to TEGP, inclusive of Tallgrass Equity and TEP, including indirectly charged wages and salaries, other compensation and benefits, and shared services prior to January 1, 2018 as discussed above.

Schedule of Balances of Gas Imbalance with Affiliated Shippers

Gas imbalances with affiliated shippers are as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Affiliate gas imbalance receivables	$	13	$	18
Affiliate gas imbalance payables	$	269	$	442

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Inventory - (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Components of Inventory

The components of inventory at March 31, 2018 and December 31, 2017 consisted of the following:

	March 31, 2018		December 31, 2017
	(in thousands)
Crude oil	$	21,517	$	12,792
Materials and supplies	5,914		5,891
Natural gas liquids	607		942
Gas in underground storage	4,109		1,984
Total inventory	$	32,147	$	21,609

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Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2018

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, 2018			December 31, 2017
	(in thousands)
Crude oil pipelines	$	1,252,262		$	1,220,379
Gathering, processing and terminalling assets (1)	744,515			675,092
Natural gas pipelines	585,483			581,400
General and other	118,355			98,680
Construction work in progress	112,464			97,978
Accumulated depreciation and amortization	(314,364		)	(279,192		)
Total property, plant and equipment, net	$	2,498,715		$	2,394,337

⁽¹⁾  Includes approximately $46.2 million and $40.1 million of assets associated with the acquisitions of Deeprock North and BNN North Dakota, respectively, in January 2018.

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Investments in Unconsolidated Affiliates - (Tables)

3 Months Ended

Mar. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

Summarized financial information for Rockies Express is as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Revenue	$	230,058	$	201,338
Operating income	$	128,678	$	107,369
Net income to Members	$	90,968	$	66,250

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Risk Management (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Contracts

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

	Balance Sheet Location	March 31, 2018		December 31, 2017
		(in thousands)
Crude oil derivative contracts (1)	Current assets	$	306	$	—
Crude oil derivative contracts (1)	Current liabilities	$	—	$	2,368

⁽¹⁾  As of March 31, 2018, the fair value shown for crude oil derivative contracts represents the forward sale of 242,000 barrels which will settle throughout the second quarter of 2018. As of December 31, 2017, the fair value shown for crude oil derivative contracts represents the forward sale of 356,000 barrels of crude oil which settled in the first quarter of 2018.

Derivative Contracts Included in Consolidated Statements of Income

The following table summarizes the impact of derivative contracts not designated as hedging contracts for the three months ended March 31,2018 and 2017:

	Location of gain recognized in income on derivatives	Amount of gain recognized in income on derivatives
		Three Months Ended March 31,
		2018		2017
		(in thousands)
Derivatives not designated as hedging contracts:
Crude oil derivative contracts	Sales of natural gas, NGLs, and crude oil	$	4,295	$	663
Natural gas derivative contracts	Sales of natural gas, NGLs, and crude oil	$	—	$	173
Call option derivative	Other income, net	$	—	$	1,885

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

The maximum potential exposure to credit losses on our crude oil derivative contracts at March 31, 2018 was:

	Asset Position
	(in thousands)
Gross	$	306
Netting agreement impact	—
Cash collateral held	—
Net exposure	$	306

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

The following table summarizes the fair value measurements of our derivative contracts as of March 31, 2018 and December 31, 2017, based on the fair value hierarchy:

			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)
As of March 31, 2018:
Crude oil derivative contracts	$	306	$	—	$	306	$	—
			Liability 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)
As of December 31, 2017:
Crude oil derivative contracts	$	2,368	$	—	$	2,368	$	—

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Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Line of Credit Facility [Line Items]

Schedule of Debt

Long-term debt consisted of the following at March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Tallgrass Equity revolving credit facility	$	124,000		$	146,000
TEP revolving credit facility	816,000			661,000
TEP 5.50% senior notes due September 15, 2024	750,000			750,000
TEP 5.50% senior notes due January 15, 2028	750,000			750,000
Less: Deferred financing costs, net (1)	(17,628		)	(17,737		)
Plus: Unamortized premium on 2028 Notes	3,642			3,730
Total long-term debt, net	$	2,426,014		$	2,292,993

⁽¹⁾  Deferred financing costs, net as presented above relate solely to the 2024 and 2028 Notes. Deferred financing costs associated with our revolving credit facilities are presented in noncurrent assets on our condensed consolidated balance sheets.

Carrying Amount and Fair value of Long-term Debt

The following table sets forth the carrying amount and fair value of our long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2018 and December 31, 2017, 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)
As of March 31, 2018:
Revolving credit facilities	$	—	$	940,000	$	—	$	940,000	$	940,000
2024 Notes	$	—	$	767,063	$	—	$	767,063	$	740,202
2028 Notes	$	—	$	754,425	$	—	$	754,425	$	745,812
As of December 31, 2017:
Revolving credit facilities	$	—	$	807,000	$	—	$	807,000	$	807,000
2024 Notes	$	—	$	771,645	$	—	$	771,645	$	739,824
2028 Notes	$	—	$	758,168	$	—	$	758,168	$	746,169

Tallgrass Equity, LLC

Line of Credit Facility [Line Items]

Schedule of Line of Credit Facilities

The following table sets forth the available borrowing capacity under the Tallgrass Equity revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the Tallgrass Equity revolving credit facility	$	150,000		$	150,000
Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility	(124,000		)	(146,000		)
Available capacity under the Tallgrass Equity revolving credit facility	$	26,000		$	4,000

Tallgrass Energy Partners

Line of Credit Facility [Line Items]

Schedule of Line of Credit Facilities

The following table sets forth the available borrowing capacity under the TEP revolving credit facility as of March 31, 2018 and December 31, 2017:

	March 31, 2018			December 31, 2017
	(in thousands)
Total capacity under the TEP revolving credit facility	$	1,750,000		$	1,750,000
Less: Outstanding borrowings under the TEP revolving credit facility	(816,000		)	(661,000		)
Less: Letters of credit issued under the TEP revolving credit facility	(94		)	(94		)
Available capacity under the TEP revolving credit facility	$	933,906		$	1,088,906

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Partnership and Equity and Distributions - (Tables)

3 Months Ended

Mar. 31, 2018

Tallgrass Energy GP, LP

Summary of Distributions

The following table details the distributions for the periods indicated:

Three Months Ended	Date Paid	Distributions to Class A Shareholders		Distributions per Class A Share
		(in thousands)
March 31, 2018	May 15, 2018 (1)	$	28,316	$	0.4875
December 31, 2017	February 14, 2018	21,346		0.3675
September 30, 2017	November 14, 2017	20,617		0.3550
June 30, 2017	August 14, 2017	19,891		0.3425
March 31, 2017	May 15, 2017	16,697		0.2875

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to Class A shareholders of record at the close of business on April 30, 2018.

Tallgrass Energy Partners

Summary of Distributions

TEP Distributions. The following table shows the distributions for the periods indicated:

		Distributions								Distribution per Limited Partner Common Unit
		Limited Partner Common Units		General Partner
Three Months Ended	Date Paid			Incentive Distribution Rights		General Partner Units		Total
		(in thousands, except per unit amounts)
March 31, 2018	May 15, 2018 (1)	$	71,370	$	39,816	$	1,267	$	112,453	$	0.9750
December 31, 2017	February 14, 2018	70,638		39,125		1,251		111,014		0.9650
September 30, 2017	November 14, 2017	69,174		37,744		1,219		108,137		0.9450
June 30, 2017	August 14, 2017	67,671		36,342		1,186		105,199		0.9250
March 31, 2017	May 15, 2017	60,486		29,840		1,040		91,366		0.8350

⁽¹⁾  The distribution announced on March 26, 2018 for the first quarter of 2018 will be paid on May 15, 2018 to unitholders of record at the close of business on April 30, 2018.

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Revenue from Contracts with Customers - (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The following tables provide the impact of the guidance on our condensed consolidated balance sheet as of March 31, 2018 and the condensed consolidated statement of income for the three months ended March 31, 2018:

	March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Unconsolidated investments	$	1,446,039	$	1,392,894	$	53,145	(1)

	Three Months Ended March 31, 2018
	As currently reported		Under previous guidance		Impact of ASC Topic 606
	(in thousands)
Crude oil transportation services	$	84,738	$	84,466	$	272		(2)
Sales of natural gas, NGLs, and crude oil	$	38,145	$	39,245	$	(1,100	)	(3)
Processing and other revenues	$	24,015	$	25,525	$	(1,510	)	(1)(3)
Cost of sales	$	26,351	$	28,845	$	(2,494	)	(2)(3)
Equity in earnings of unconsolidated investments	$	68,402	$	58,123	$	10,279		(1)
Net income attributable to TEGP	$	16,735	$	15,053	$	1,682
Basic net income per Class A share	$	0.29	$	0.26	$	0.03
Diluted net income per Class A share	$	0.29	$	0.26	$	0.03

⁽¹⁾  Reflects the impact on our investment in Rockies Express and the management fee collected by NatGas of the cumulative effect adjustment at Rockies Express, which arose as a result of the allocation of the transaction price to a series of individual performance obligations in certain long-term transportation contracts with tiered-pricing arrangements. The adjustment increases the carrying amount of our investment in Rockies Express to reflect increased equity in earnings and establishes a receivable for the increased management fee revenue that would have been earned by NatGas.

⁽²⁾  Reflects the impact to revenue and cost of sales to value PLA barrels collected under certain crude oil transportation arrangements at their contract inception fair value in revenue and record an associated lower of cost or net realizable value adjustment in cost of sales.

⁽³⁾  Reflects the reclassification of certain gathering and processing fees collected under arrangements determined to be supply arrangements, rather than customer arrangements under ASC 606, to cost of sales and the reclassification of certain commodities retained as consideration for processing services to processing fee revenue.

Disaggregation of Revenue

A summary of our revenue by line of business is as follows:

	Three Months Ended March 31, 2018
	Natural Gas Transportation segment		Crude Oil Transportation segment		Gathering, Processing, & Terminalling segment		Corporate and Other			Total Revenue
	(in thousands)
Crude oil transportation - committed shipper revenue	$	—	$	84,738	$	—	$	—		$	84,738
Natural gas transportation - firm service	33,334		—		—		(1,883		)	31,451
Water business services	—		—		13,204		—			13,204
Natural gas gathering & processing fees	—		—		5,044		—			5,044
All other (1)	2,630		3,319		5,706		(6,088		)	5,567
Total service revenue	35,964		88,057		23,954		(7,971		)	140,004
Natural gas liquids sales	—		—		23,609		—			23,609
Natural gas sales	238		—		7,847		—			8,085
Crude oil sales	—		1,909		247		—			2,156
Total commodity sales revenue	238		1,909		31,703		—			33,850
Total revenue from contracts with customers	36,202		89,966		55,657		(7,971		)	173,854
Other revenue (2)	—		—		8,181		(2,941		)	5,240
Total revenue (3)	$	36,202	$	89,966	$	63,838	$	(10,912	)	$	179,094

⁽¹⁾  Includes revenue from crude oil terminal services, interruptible natural gas transportation and storage, and natural gas park and loan service.

⁽²⁾  Includes lease and derivative revenue not subject to ASC 606.

⁽³⁾  Excludes $230.1 million of revenue recognized at Rockies Express for the three months ended March 31, 2018. See Note 8 – Investments in Unconsolidated Affiliates for additional information about our investment in Rockies Express.

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

We expect to recognize the total backlog during the remainder of 2018 and future periods as follows (in thousands):

Year	Estimated Revenue
2018	$	387,826
2019	488,919
2020	317,235
2021	138,686
2022	129,548
Thereafter	271,311
Total	$	1,733,525

Contract with Customer, Asset and Liability

Contract balances as of March 31, 2018 were as follows:

	March 31, 2018		January 1, 2018
	(in thousands)
Accounts receivable from contracts with customers	$	68,039	$	61,888
Other accounts receivable	63,362		56,727
Accounts receivable, net	$	131,401	$	118,615
Deferred revenue from contracts with customers (1)	$	99,922	$	88,471

⁽¹⁾  Revenue recognized during the three months ended March 31, 2018 that was included in the deferred revenue balance at the beginning of the period was $3.1 million. This revenue primarily represented the utilization of shipper deficiencies at Pony Express.

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Net Income per Class A Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Summary of Net Income per Class A Share

The following table illustrates the calculation of net income per Class A share for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018		2017
	(in thousands, except per unit amounts)
Basic Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Basic weighted average Class A Shares outstanding	58,085		58,075
Basic net income per Class A share	$	0.29	$	0.21
Diluted Net Income per Class A Share
Net income attributable to TEGP	$	16,735	$	12,029
Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares	69		8
Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares	$	16,804	$	12,037
Basic weighted average Class A Shares outstanding	58,085		58,075
Equity Participation Shares equivalent shares	125		90
Diluted weighted average Class A Shares outstanding	58,210		58,165
Diluted net income per Class A Share	$	0.29	$	0.21

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Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Summary of TEGP's Segment Information of Revenue

The following tables set forth our segment information for the periods indicated:

	Three Months Ended March 31, 2018							Three Months Ended March 31, 2017
Revenue:	Total Revenue		Inter- Segment			External Revenue		Total Revenue		Inter- Segment			External Revenue
	(in thousands)
Natural Gas Transportation	$	36,202	$	(1,858	)	$	34,344	$	36,428	$	(1,445	)	$	34,983
Crude Oil Transportation	89,966		(3,319		)	86,647		84,994		—			84,994
Gathering, Processing & Terminalling	63,838		(5,735		)	58,103		27,307		(2,884		)	24,423
Corporate and Other	—		—			—		—		—			—
Total revenue	$	190,006	$	(10,912	)	$	179,094	$	148,729	$	(4,329	)	$	144,400

Summary of TEGP's Segment Information of Earnings

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
Operating Income:	Total Operating Income			Inter- Segment			External Operating Income			Total Operating Income			Inter- Segment			External Operating Income
	(in thousands)
Natural Gas Transportation	$	19,384		$	(2,255	)	$	17,129		$	18,168		$	(1,445	)	$	16,723
Crude Oil Transportation	46,527			4,150			50,677			43,725			4,228			47,953
Gathering, Processing & Terminalling	23,305			(1,895		)	21,410			5,106			(2,783		)	2,323
Corporate and Other	(7,303		)	—			(7,303		)	(3,773		)	—			(3,773		)
Total Operating Income	$	81,913		$	—		$	81,913		$	63,226		$	—		$	63,226
Reconciliation to Net Income:
Equity in earnings of unconsolidated investments							68,402									20,738
Interest expense, net							(29,761		)							(16,017		)
Other income, net							451									1,955
Net income before tax							$	121,005								$	69,902

Summary of TEGP's Segment Information of Capital Expenditures

	Three Months Ended March 31,
Capital Expenditures:	2018		2017
	(in thousands)
Natural Gas Transportation	$	9,885	$	4,655
Crude Oil Transportation	16,952		7,343
Gathering, Processing & Terminalling	31,139		14,771
Corporate and Other	784		—
Total capital expenditures	$	58,760	$	26,769

Summary of TEGP's Segment Information of Assets

Assets:	March 31, 2018		December 31, 2017
	(in thousands)
Natural Gas Transportation	$	2,143,693	$	1,606,666
Crude Oil Transportation	1,412,650		1,407,758
Gathering, Processing & Terminalling	1,095,410		943,340
Corporate and Other	341,907		334,249
Total assets	$	4,993,660	$	4,292,013

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Description of Business - Additional Information (Detail)			3 Months Ended
	Mar. 26, 2018	Feb. 07, 2018 USD ($) shares	Mar. 31, 2018 shares	Jan. 01, 2017
Organization [Line Items]
Limited Liability Company (LLC) or General Partner, Ownership Interest			1.13%
Stockholders' Equity Note, Stock Split, Conversion Ratio	0
Rockies Express Pipeline LLC
Organization [Line Items]
Equity Method Investment, Ownership Percentage			75.00%
Rockies Express Pipeline LLC | Tallgrass Development LP
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		25.01%
Tallgrass NatGas Operator, LLC
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Tallgrass Terminals, LLC
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Tallgrass Equity, LLC
Organization [Line Items]
Variable Interest Entity, Ownership Percentage			31.43%
Tallgrass Equity, LLC | Tallgrass Development LP
Organization [Line Items]
Units Acquired		5,619,218
Tallgrass MLP GP, LLC
Organization [Line Items]
Limited Liability Company (LLC) or General Partner, Ownership Interest			100.00%
Ownership Interests Held By Tallgrass MLP GP, LLC
Organization [Line Items]
General partner units issued			834,391
Tallgrass Energy Partners
Organization [Line Items]
Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interest Units			25,619,218
Ownership Percentage Of Aggregate Partnership Equity, Including General Partner Units	100.00%		0.00%
Tallgrass Energy Partners | Rockies Express Pipeline LLC
Organization [Line Items]
Equity Method Investment, Ownership Percentage			49.99%
Ownership Interests Held By Public
Organization [Line Items]
Limited Partners' Capital Account, Units Outstanding			47,580,535
Capital Unit, Class B | TEGP and Tallgrass Equity, LLC
Organization [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		27,554,785
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $		$ 644,800,000

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 44,100
Unconsolidated investments	$ 1,446,039		$ 909,531
Accounts receivable, net	$ 131,401		$ 118,615
Rockies Express Pipeline LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unconsolidated investments		42,800
Tallgrass NatGas Operator, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		1,300
Rockies Express Pipeline LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 125,200

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VIE Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax asset	$ 306,304	$ 312,997

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Acquisitions & Dispositions - Equity Method Investments (Details) - Rockies Express Pipeline LLC $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ (1,127,264)
Basis Difference, Amortization Period	35 years
Long-term Debt
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 48,455
Property, Plant and Equipment
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ (1,175,719)
Basis Difference, Amortization Period	35 years
Minimum | Long-term Debt
Schedule of Equity Method Investments [Line Items]
Basis Difference, Amortization Period	2 years
Maximum | Long-term Debt
Schedule of Equity Method Investments [Line Items]
Basis Difference, Amortization Period	25 years

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Acquisitions & Dispositions - BNN North Dakota Acquisition, Assets Acquired & Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 12, 2018	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Inventories		$ 32,147	$ 21,609
Property, plant and equipment, net		2,498,715	2,394,337
Intangible assets, net		$ 136,554	$ 97,731
BNN North Dakota
Business Acquisition [Line Items]
Accounts receivable	$ 2,457
Inventories	67
Property, plant and equipment, net	48,900
Intangible assets, net	46,800
Accounts Payable and Accrued Liabilities	3,224
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 95,000
Minimum
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	8 years
Maximum
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	14 years

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Acquisitions & Dispositions - Pro Forma Revenue & Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Combinations [Abstract]
Pro Forma Revenue	$ 179,522	$ 146,716
Pro Forma Net income attributable to TEGP	$ 16,761	$ 11,939

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Acquisitions & Dispositions - Additional Information (Details)							3 Months Ended
	Feb. 23, 2018 USD ($)	Feb. 07, 2018 USD ($) shares	Feb. 06, 2018 USD ($) mi	Feb. 01, 2018 USD ($)	Jan. 12, 2018 USD ($) a	Jan. 02, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jan. 01, 2016
Business Acquisition [Line Items]
Sale of Tallgrass Crude Gathering							$ 50,046,000
Payments to acquire equity method investments							(19,500,000)
Payments to Acquire Interest in Subsidiaries and Affiliates							0		$ 400,000,000
Acquisition of BNN North Dakota, net of cash acquired							(95,000,000)
Issuance of Noncontrolling Interest in Subsidiary in Exchange for Membership Interest							$ 31,843,000
BNN North Dakota
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual								$ 3,100,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual								$ 200,000
Tallgrass Crude Gathering, LLC
Business Acquisition [Line Items]
Ownership Percentage in Subsidiary			100.00%
Miles of gathering pipeline | mi			50
Sale of Tallgrass Crude Gathering			$ 50,000,000
Gain on sale of TCG			$ 9,400,000
BNN North Dakota
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Acres for Water Gathering and Disposal System | a					133,000
BNN North Dakota | Tallgrass Energy Partners
Business Acquisition [Line Items]
Acquisition of BNN North Dakota, net of cash acquired					$ (95,000,000)
Pony Express Pipeline
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				2.00%						31.30%
Ownership Percentage in Subsidiary				100.00%
Pony Express Pipeline | Tallgrass Energy Partners
Business Acquisition [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates				$ 60,000,000
Deeprock Development, LLC
Business Acquisition [Line Items]
Ownership Percentage in Subsidiary						60.00%
Tallgrass Development LP | Tallgrass Equity, LLC
Business Acquisition [Line Items]
Units Acquired | shares		5,619,218
Tallgrass Development LP | Rockies Express Pipeline LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		25.01%
Iron Horse Pipeline, LLC
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Payments to acquire equity method investments	$ (3,500,000)
Rockies Express Pipeline LLC
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage							75.00%	75.00%
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity							$ (1,127,264,000)	$ (1,127,264,000)
Basis Difference, Amortization Period							35 years
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service							2.90%
Payments to acquire equity method investments							$ (3,220,000)
Rockies Express Pipeline LLC | Tallgrass Equity, LLC
Business Acquisition [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		$ 376,500,000
Rockies Express Pipeline LLC | Tallgrass Energy Partners
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage							49.99%	49.99%
Deeprock North, LLC
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage						38.00%
Deeprock North, LLC | Tallgrass Energy Partners
Business Acquisition [Line Items]
Payments to acquire equity method investments						$ (19,500,000)
Capital Unit, Class B | TEGP and Tallgrass Equity, LLC
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		27,554,785
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 644,800,000
General Partner | Pony Express Pipeline
Business Acquisition [Line Items]
Partners' Capital Account, Acquisitions							$ 16,152,000

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Related Party Transactions - Schedule of Transactions with Affiliated Companies (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Revenue from related parties	$ 1,896	$ 1,632
Cost of transportation services from related parties	0	4,507
Operations and maintenance
Related Party Transaction [Line Items]
Expenses related to transactions with related companies	0	6,277
General and administrative expense
Related Party Transaction [Line Items]
Expenses related to transactions with related companies	0	9,573
Property, Plant and Equipment
Related Party Transaction [Line Items]
Costs capitalized from transactions with related parties	$ 0	$ 293

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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	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Receivable from related parties	$ 4,472	$ 1,340
Accounts payable to related parties	0	5,342
Rockies Express Pipeline LLC
Related Party Transaction [Line Items]
Receivable from related parties	4,324	1,340
Iron Horse Pipeline, LLC
Related Party Transaction [Line Items]
Receivable from related parties	148	0
Tallgrass Operations, LLC
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 0	$ 5,342

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Related Party Transactions - Schedule of Balances of Gas Imbalance with Affiliated Shippers (Detail) - Affiliated Shippers - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Affiliate gas imbalance receivables	$ 13	$ 18
Affiliate gas imbalance payables	$ 269	$ 442

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Inventory - (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Crude oil	$ 21,517	$ 12,792
Materials and supplies	5,914	5,891
Natural gas liquids	607	942
Gas in underground storage	4,109	1,984
Inventory, Net	$ 32,147	$ 21,609

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Property Plant and Equipment - Components of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (314,364)	$ (279,192)
Property, plant and equipment	2,498,715	2,394,337
Crude oil pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,252,262	1,220,379
Gathering, processing and terminalling assets (1)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	744,515	675,092
Natural gas pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	585,483	581,400
General and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	118,355	98,680
Construction work in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	112,464	$ 97,978
Deeprock North, LLC | Gathering, processing and terminalling assets (1)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	46,200
BNN North Dakota | Gathering, processing and terminalling assets (1)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 40,100

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Investments in Unconsolidated Affiliates - Equity Method Investments (Details) - Rockies Express Pipeline LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Revenue	$ 230,058	$ 201,338
Operating income	128,678	107,369
Net income to Members	$ 90,968	$ 66,250

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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Feb. 07, 2018
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated investments	$ 68,402	$ 20,738
Payments to acquire equity method investments	$ (19,500)
Rockies Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Equity in earnings of unconsolidated investments	$ 67,059
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries	87,800
Payments to acquire equity method investments	$ (3,220)
Rockies Express Pipeline LLC | Tallgrass Development LP
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			25.01%

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Risk Management - Schedule of Fair Value of Derivative Contracts (Detail) - Energy Related Derivative $ in Thousands	Mar. 31, 2018 USD ($) bbl	Dec. 31, 2017 USD ($) bbl
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	$ 306
Derivative liability at fair value		$ 2,368
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	306	0
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability at fair value	$ 0	$ 2,368
Commodity
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount | bbl	242,000	356,000

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Risk Management - Derivative Contracts Included in Consolidated Statement of Income (Detail) - Derivatives not designated as hedging contracts - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Energy Related Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in income on derivatives	$ 4,295	$ 663
Energy commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in income on derivatives	0	173
Equity Option
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in income on derivatives	$ 0	$ 1,885

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Risk Management - Derivative Instruments Maximum Potential Exposure to Credit Loss (Details) - Energy Related Derivative $ in Thousands	Mar. 31, 2018 USD ($)
Concentration Risk [Line Items]
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	$ 306
Netting agreement impact	0
Cash Collateral for Borrowed Securities	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	$ 306

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Risk Management - Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification (Detail) - Energy Related Derivative - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	$ 306
Derivative liability at fair value		$ 2,368
Quoted prices in active markets for identical assets (Level 1)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	0
Derivative liability at fair value		0
Significant other observable inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	306
Derivative liability at fair value		2,368
Significant unobservable inputs (Level 3)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	$ 0
Derivative liability at fair value		$ 0

XML

Risk Management - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Feb. 01, 2017	Jan. 01, 2016	Mar. 31, 2018	Mar. 31, 2017	Feb. 01, 2018
Derivative [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased			736,262
Partial exercise of call option			$ 35,300
Cash in Margin Accounts and Outstanding Letters of Credit	0.8	3.0
Pony Express Pipeline
Derivative [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				31.30%			2.00%
Equity Option
Derivative [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased			1,703,094
Partial exercise of call option			$ 72,400		$ 0	$ 72,381
Equity Option | Pony Express Pipeline
Derivative [Line Items]
Derivative, Term of Contract				18 months
Option Indexed to Issuer's Equity, Strike Price				$ 42.50
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares				6,518,000

XML

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Less: Deferred financing costs, net	$ (17,628)	$ (17,737)
Total long-term debt, net	2,426,014	2,292,993
Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt, net	940,000	807,000
Tallgrass Equity, LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	124,000	146,000
Total long-term debt, net	124,000	146,000
Tallgrass Energy Partners
Debt Instrument [Line Items]
Plus: Unamortized premium on 2028 Notes	3,642	3,730
Tallgrass Energy Partners | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	816,000	661,000
Total long-term debt, net	816,000	661,000
2024 Senior Notes
Debt Instrument [Line Items]
Total long-term debt, net	740,202	739,824
2024 Senior Notes | Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000	750,000
2028 Senior Notes
Debt Instrument [Line Items]
Total long-term debt, net	745,812	746,169
2028 Senior Notes | Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 750,000	$ 750,000

XML

Long-term Debt - Capacity under Revolving Credit Facility - Tallgrass Equity (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	May 12, 2015
Line of Credit Facility [Line Items]
Long-term Debt	$ (2,426,014,000)	$ (2,292,993,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	(940,000,000)	(807,000,000)
Tallgrass Equity, LLC | Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	(124,000,000)	(146,000,000)
Line of Credit Facility, Remaining Borrowing Capacity	26,000,000	4,000,000
Barclays Bank | Tallgrass Equity, LLC | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150,000,000	$ 150,000,000	$ 150,000,000

XML

Long-term Debt - Capacity under Revolving Credit Facility - TEP (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Long-term Debt	$ (2,426,014,000)	$ (2,292,993,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	(940,000,000)	(807,000,000)
Tallgrass Energy Partners | Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	(816,000,000)	(661,000,000)
Letters of Credit Outstanding, Amount	(94,000)	(94,000)
Line of Credit Facility, Remaining Borrowing Capacity	933,906,000	1,088,906,000
Wells Fargo Bank, National Association | Tallgrass Energy Partners | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,750,000,000	$ 1,750,000,000

XML

Long-term Debt - Carrying Amount and Fair Value of Long-term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 2,426,014	$ 2,292,993
2024 Senior Notes
Debt Instrument [Line Items]
Fair Value	767,063	771,645
Long-term Debt	740,202	739,824
2024 Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Debt Instrument [Line Items]
Fair Value	0	0
2024 Senior Notes | Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair Value	767,063	771,645
2024 Senior Notes | Significant unobservable inputs (Level 3)
Debt Instrument [Line Items]
Fair Value	0	0
2028 Senior Notes
Debt Instrument [Line Items]
Fair Value	754,425	758,168
Long-term Debt	745,812	746,169
2028 Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Debt Instrument [Line Items]
Fair Value	0	0
2028 Senior Notes | Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair Value	754,425	758,168
2028 Senior Notes | Significant unobservable inputs (Level 3)
Debt Instrument [Line Items]
Fair Value	0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Fair Value	940,000	807,000
Long-term Debt	940,000	807,000
Revolving Credit Facility | Quoted prices in active markets for identical assets (Level 1)
Debt Instrument [Line Items]
Fair Value	0	0
Revolving Credit Facility | Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair Value	940,000	807,000
Revolving Credit Facility | Significant unobservable inputs (Level 3)
Debt Instrument [Line Items]
Fair Value	$ 0	$ 0

XML

Long-term Debt - Additional Information (Detail)					3 Months Ended
	Dec. 11, 2017 USD ($)	Sep. 15, 2017 USD ($)	May 16, 2017 USD ($)	Sep. 01, 2016 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 12, 2015 USD ($)
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate					3.27%
Debt Instrument, Interest Rate, Effective Percentage					3.53%
Maximum
Debt Instrument [Line Items]
Credit facility commitment fee					0.50%
Minimum
Debt Instrument [Line Items]
Credit facility commitment fee					0.25%
Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					5.50%
Tallgrass Energy Partners | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,750,000,000	$ 1,750,000,000
Tallgrass Energy Partners | Maximum | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Consolidated leverage ratio					5.0
Contingent Consolidated Leverage Ratio					5.50
Consolidated Senior Secured Leverage Ratio One					3.75
Tallgrass Energy Partners | Minimum | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Consolidated Interest Coverage Ratio One					2.50
Tallgrass Equity, LLC
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate					4.38%
Debt Instrument, Interest Rate, Effective Percentage					4.47%
Tallgrass Equity, LLC | Revolving Credit Facility | Barclays Bank
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 150,000,000	$ 150,000,000	$ 150,000,000
Credit facility commitment fee					0.50%
Tallgrass Equity, LLC | Maximum | Revolving Credit Facility | Barclays Bank
Debt Instrument [Line Items]
Consolidated leverage ratio					3.00
2028 Senior Notes | Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 250,000,000	$ 500,000,000
2024 Senior Notes | Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 350,000,000	$ 400,000,000

XML

Partnership and Equity Distributions - TEGP Summary of Distributions (Details) - Tallgrass Energy GP, LP - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Distribution Made to Limited Partner [Line Items]
Distributions to Class A Shareholders	$ (28,316)	$ (21,346)	$ (20,617)	$ (19,891)	$ (16,697)
Distributions per Class A Share	$ 0.4875	$ 0.3675	$ 0.3550	$ 0.3425	$ 0.2875

XML

Partnership Equity and Distributions - TEP Summary of Distributions (Details) - Tallgrass Energy Partners - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Distribution Made to Limited Partner [Line Items]
Limited Partner Common Units	$ 71,370	$ 70,638	$ 69,174	$ 67,671	$ 60,486
Incentive Distribution Rights	39,816	39,125	37,744	36,342	29,840
General Partner Units	1,267	1,251	1,219	1,186	1,040
Total Distributions	$ (112,453)	$ (111,014)	$ (108,137)	$ (105,199)	$ (91,366)
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 0.9750	$ 0.9650	$ 0.9450	$ 0.9250	$ 0.8350

XML

Partnership Equity and Distributions - Additional Information (Detail) - USD ($)			3 Months Ended
	Feb. 07, 2018	Feb. 01, 2017	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Feb. 01, 2018	May 17, 2016	Jan. 01, 2016	May 13, 2015
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased		736,262
Payments for Repurchase of Common Stock		$ 35,300,000
Treasury Stock Acquired, Average Cost Per Share		$ 47.99
Distributions to noncontrolling interests			$ (89,073,000)				$ (71,426,000)
Payments for Purchase of Common Stock			(198,000,000)
Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Authorized Amount									$ 657,500,000		$ 100,000,000
Partners' Capital Account, Units, Sold in Public Offering							2,087,647
SharesIssuedWeightedAveragePricePerShare							$ 48.23
Issuance of TEP units to the public, net of offering costs							$ 99,400,000
LimitedPartnerOfferingCosts							1,300,000.0
Payments for Repurchase of Common Stock			$ 0				35,335,000
Equity interest held by noncontrolling interests			64.27%
Partners' Capital Account, Distributions			$ 112,453,000	$ 111,014,000	$ 108,137,000	$ 105,199,000	91,366,000
Tallgrass Equity, LLC
Limited Partners' Capital Account [Line Items]
Equity interest held by noncontrolling interests			68.57%
Deeprock Development, LLC
Limited Partners' Capital Account [Line Items]
Equity interest held by noncontrolling interests			40.00%
Noncontrolling Interest
Limited Partners' Capital Account [Line Items]
Contributions from noncontrolling interest			$ 183,000				700,000
Distributions to noncontrolling interests			(89,073,000)				(71,400,000)
Tallgrass Equity distributions to noncontrolling interests			36,400,000				27,500,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			1,300,000.0				1,400,000.0
Contributions from TD							1,451,000
Noncontrolling Interest | Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Issuance of TEP units to the public, net of offering costs			(40,000)				89,353,000
Payments for Repurchase of Common Stock							(31,717,000)
Carrying Value of Common Units	53.8
Payments for Purchase of Common Stock			(189,520,000)
Noncontrolling Interest | Rockies Express Pipeline LLC
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Acquisitions			74,421,000				40,159,000
Total Partner Equity Including Portion Attributable to Noncontrolling Interest
Limited Partners' Capital Account [Line Items]
Contributions from noncontrolling interest			183,000				710,000
Distributions to noncontrolling interests			(89,073,000)				(71,426,000)
Contributions from TD							2,301,000
Total Partner Equity Including Portion Attributable to Noncontrolling Interest | Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Issuance of TEP units to the public, net of offering costs			(45,000)				99,373,000
Payments for Repurchase of Common Stock							(35,335,000)
Partners' Capital Account, Distributions			(51,300,000)				(42,500,000)
Payments for Purchase of Common Stock			(251,742,000)
Total Partner Equity Including Portion Attributable to Noncontrolling Interest | Rockies Express Pipeline LLC
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Acquisitions			$ 108,537,000				$ 63,681,000
Pony Express Pipeline
Limited Partners' Capital Account [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								2.00%		31.30%

XML

Revenue from Contracts with Customers - Impact of Adoption (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unconsolidated investments	$ 1,446,039		$ 909,531
Crude oil transportation services	84,738	$ 84,331
Sales of natural gas, NGLs, and crude oil	(38,145)	(15,381)
Processing and other revenues	(24,015)	(13,003)
Cost of sales	26,351	12,370
Equity in earnings of unconsolidated investments	68,402	20,738
Net income attributable to TEGP	$ 16,735	$ 12,029
Basic net income per Class A share	$ 0.29	$ 0.21
Diluted net income per Class A share	$ 0.29	$ 0.21
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unconsolidated investments	$ 1,392,894
Crude oil transportation services	84,466
Sales of natural gas, NGLs, and crude oil	(39,245)
Processing and other revenues	(25,525)
Cost of sales	28,845
Equity in earnings of unconsolidated investments	58,123
Net income attributable to TEGP	$ 15,053
Basic net income per Class A share	$ 0.26
Diluted net income per Class A share	$ 0.26
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unconsolidated investments	$ 53,145
Crude oil transportation services	272
Sales of natural gas, NGLs, and crude oil	(1,100)
Processing and other revenues	(1,510)
Cost of sales	(2,494)
Equity in earnings of unconsolidated investments	10,279
Net income attributable to TEGP	$ 1,682
Basic net income per Class A share	$ 0.03
Diluted net income per Class A share	$ 0.03

XML

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 179,094
Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	84,738
Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	31,451
Water business services
Disaggregation of Revenue [Line Items]
Revenue, Net	13,204
Natural Gas Gathering & Processing
Disaggregation of Revenue [Line Items]
Revenue, Net	5,044
Other Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	5,567
Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	140,004
Natural Gas Liquids
Disaggregation of Revenue [Line Items]
Revenue, Net	23,609
Natural Gas
Disaggregation of Revenue [Line Items]
Revenue, Net	8,085
Crude Oil
Disaggregation of Revenue [Line Items]
Revenue, Net	2,156
Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	33,850
Total Service and Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	173,854
Other Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	5,240
Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	36,202
Natural Gas Transportation | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Natural Gas Transportation | Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	33,334
Natural Gas Transportation | Water business services
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Natural Gas Transportation | Natural Gas Gathering & Processing
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Natural Gas Transportation | Other Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	2,630
Natural Gas Transportation | Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	35,964
Natural Gas Transportation | Natural Gas Liquids
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Natural Gas Transportation | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue, Net	238
Natural Gas Transportation | Crude Oil
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Natural Gas Transportation | Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	238
Natural Gas Transportation | Total Service and Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	36,202
Natural Gas Transportation | Other Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	89,966
Crude Oil Transportation | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	84,738
Crude Oil Transportation | Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation | Water business services
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation | Natural Gas Gathering & Processing
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation | Other Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	3,319
Crude Oil Transportation | Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	88,057
Crude Oil Transportation | Natural Gas Liquids
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Crude Oil Transportation | Crude Oil
Disaggregation of Revenue [Line Items]
Revenue, Net	1,909
Crude Oil Transportation | Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	1,909
Crude Oil Transportation | Total Service and Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	89,966
Crude Oil Transportation | Other Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Gathering, Processing & Terminalling
Disaggregation of Revenue [Line Items]
Revenue, Net	63,838
Gathering, Processing & Terminalling | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Gathering, Processing & Terminalling | Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Gathering, Processing & Terminalling | Water business services
Disaggregation of Revenue [Line Items]
Revenue, Net	13,204
Gathering, Processing & Terminalling | Natural Gas Gathering & Processing
Disaggregation of Revenue [Line Items]
Revenue, Net	5,044
Gathering, Processing & Terminalling | Other Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	5,706
Gathering, Processing & Terminalling | Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	23,954
Gathering, Processing & Terminalling | Natural Gas Liquids
Disaggregation of Revenue [Line Items]
Revenue, Net	23,609
Gathering, Processing & Terminalling | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue, Net	7,847
Gathering, Processing & Terminalling | Crude Oil
Disaggregation of Revenue [Line Items]
Revenue, Net	247
Gathering, Processing & Terminalling | Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	31,703
Gathering, Processing & Terminalling | Total Service and Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	55,657
Gathering, Processing & Terminalling | Other Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	8,181
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue, Net	(10,912)
Corporate and Other | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Natural Gas Transportation
Disaggregation of Revenue [Line Items]
Revenue, Net	(1,883)
Corporate and Other | Water business services
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Natural Gas Gathering & Processing
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Other Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	(6,088)
Corporate and Other | Service Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	(7,971)
Corporate and Other | Natural Gas Liquids
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Crude Oil
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	0
Corporate and Other | Total Service and Commodity Sales Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	(7,971)
Corporate and Other | Other Revenue
Disaggregation of Revenue [Line Items]
Revenue, Net	(2,941)
Rockies Express Pipeline LLC
Disaggregation of Revenue [Line Items]
Revenue	$ 230,058	$ 201,338

XML

Revenue from Contracts with Customers - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, Net	$ 68,039	$ 61,888
Accounts and Other Receivables, Net, Current	63,362	56,727
Accounts receivable, net	131,401	118,615
Deferred revenue	99,922	$ 88,471
Contract with Customer, Liability, Revenue Recognized	$ 3,100

XML

Net Income per Class A Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to TEGP	$ 16,735	$ 12,029
Basic average number of Class A shares outstanding	58,085	58,075
Basic net income per Class A share	$ 0.29	$ 0.21
Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares	$ 69	$ 8
Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares	$ 16,804	$ 12,037
Equity Participation Shares equivalent shares	125	90
Diluted weighted average Class A Shares outstanding	58,210	58,165
Diluted net income per Class A Share	$ 0.29	$ 0.21

XML

Regulatory Matters (Details)	3 Months Ended
	Mar. 31, 2018 Bcf / d mi	Jul. 01, 2017
Public Utilities, General Disclosures [Line Items]
Capacity Enhancement | Bcf / d	0.8
Miles of Pipeline | mi	70
Size of Pipeline	36
Pony Express Pipeline
Public Utilities, General Disclosures [Line Items]
FERC Annual Index Adjustment		0.00%

XML

Legal and Environmental Matters - Additional Information (Detail)			3 Months Ended	12 Months Ended			15 Months Ended	24 Months Ended	36 Months Ended
	Jul. 12, 2017 USD ($)	Jan. 12, 2017 USD ($) Bcf / d	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 Bcf / d mi	Dec. 31, 2015 mi	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 14, 2016 USD ($)
Loss Contingencies [Line Items]
Environmental accruals			$ 7,700,000					$ 7,700,000	$ 7,700,000
Cost of Services, Environmental Remediation								$ 21,800,000
Aggregate cost of crack tool runs									$ 18,000,000
General Partner
Loss Contingencies [Line Items]
Contributions from TD							$ 20,000,000
Trailblazer
Loss Contingencies [Line Items]
Miles of Natural Gas Pipeline Needing Repair or Replacement | mi					8
Trailblazer | Minimum
Loss Contingencies [Line Items]
Miles of Natural Gas Pipeline Needing Repair or Replacement | mi						25
Trailblazer | Maximum
Loss Contingencies [Line Items]
Miles of Natural Gas Pipeline Needing Repair or Replacement | mi						35
Tallgrass Development LP
Loss Contingencies [Line Items]
Contractual indemnity provided to TEP by TD			20,000,000
Annual deductible			$ 1,500,000
Ultra Resources Complaint
Loss Contingencies [Line Items]
Firm transportation service agreement | Bcf / d		0.2			0.2
Gain Contingency, Unrecorded Amount										$ 303,000,000
Litigation Settlement, Amount Awarded from Other Party	$ 150,000,000
Firm Transportation Rate		$ 0.37
Anticipated Annual Revenue		$ 26,800,000
Subsequent Event
Loss Contingencies [Line Items]
Total Remediation costs				$ 4,800,000
Remediation costs, Anticipated costs				$ 20,000,000

XML

Reporting Segments - Summary of TEGP's Segment Information of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total Revenues	$ 179,094	$ 144,400
TEGP
Segment Reporting Information [Line Items]
Total Revenues	179,094	144,400
TEGP | Natural Gas Transportation
Segment Reporting Information [Line Items]
Total Revenues	34,344	34,983
TEGP | Crude Oil Transportation
Segment Reporting Information [Line Items]
Total Revenues	86,647	84,994
TEGP | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Total Revenues	58,103	24,423
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	0	0
TEGP | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	190,006	148,729
TEGP | Operating Segments | Natural Gas Transportation
Segment Reporting Information [Line Items]
Total Revenues	36,202	36,428
TEGP | Operating Segments | Crude Oil Transportation
Segment Reporting Information [Line Items]
Total Revenues	89,966	84,994
TEGP | Operating Segments | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Total Revenues	63,838	27,307
TEGP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	0	0
TEGP | Inter-Segment
Segment Reporting Information [Line Items]
Total Revenues	(10,912)	(4,329)
TEGP | Inter-Segment | Natural Gas Transportation
Segment Reporting Information [Line Items]
Total Revenues	(1,858)	(1,445)
TEGP | Inter-Segment | Crude Oil Transportation
Segment Reporting Information [Line Items]
Total Revenues	(3,319)	0
TEGP | Inter-Segment | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Total Revenues	(5,735)	(2,884)
TEGP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	$ 0	$ 0

XML

Reporting Segments - Summary of TEGP's Segment Information of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Operating Income	$ 81,913	$ 63,226
Reconciliation to Net Income:
Equity in earnings of unconsolidated investments	68,402	20,738
Interest expense, net	(29,761)	(16,017)
Other income, net	451	1,955
Net income before tax	121,005	69,902
TEGP
Segment Reporting Information [Line Items]
Operating Income	81,913	63,226
Reconciliation to Net Income:
Net income before tax	121,005	69,902
TEGP | Natural Gas Transportation
Segment Reporting Information [Line Items]
Operating Income	17,129	16,723
TEGP | Crude Oil Transportation
Segment Reporting Information [Line Items]
Operating Income	50,677	47,953
TEGP | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Operating Income	21,410	2,323
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	(7,303)	(3,773)
TEGP | Operating Segments
Segment Reporting Information [Line Items]
Operating Income	81,913	63,226
TEGP | Operating Segments | Natural Gas Transportation
Segment Reporting Information [Line Items]
Operating Income	19,384	18,168
TEGP | Operating Segments | Crude Oil Transportation
Segment Reporting Information [Line Items]
Operating Income	46,527	43,725
TEGP | Operating Segments | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Operating Income	23,305	5,106
TEGP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	(7,303)	(3,773)
TEGP | Inter-Segment
Segment Reporting Information [Line Items]
Operating Income	0	0
TEGP | Inter-Segment | Natural Gas Transportation
Segment Reporting Information [Line Items]
Operating Income	(2,255)	(1,445)
TEGP | Inter-Segment | Crude Oil Transportation
Segment Reporting Information [Line Items]
Operating Income	4,150	4,228
TEGP | Inter-Segment | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Operating Income	(1,895)	(2,783)
TEGP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	0	0
TEGP | Segment Reconciling Items
Reconciliation to Net Income:
Equity in earnings of unconsolidated investments	68,402	20,738
Interest expense, net	(29,761)	(16,017)
Other income, net	$ 451	$ 1,955

XML

Reporting Segments - Summary of TEGP's Segment Information for Payments to Acquire Plant, Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 58,760	$ 26,769
TEGP
Segment Reporting Information [Line Items]
Capital expenditures	58,760	26,769
TEGP | Natural Gas Transportation
Segment Reporting Information [Line Items]
Capital expenditures	9,885	4,655
TEGP | Crude Oil Transportation
Segment Reporting Information [Line Items]
Capital expenditures	16,952	7,343
TEGP | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Capital expenditures	31,139	14,771
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Capital expenditures	$ 784	$ 0

XML

Reporting Segments - Summary of TEGP's Segment Information of Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Segment assets	$ 4,993,660	$ 4,292,013
TEGP
Segment Reporting Information [Line Items]
Segment assets	4,993,660	4,292,013
TEGP | Natural Gas Transportation
Segment Reporting Information [Line Items]
Segment assets	2,143,693	1,606,666
TEGP | Crude Oil Transportation
Segment Reporting Information [Line Items]
Segment assets	1,412,650	1,407,758
TEGP | Gathering, Processing & Terminalling
Segment Reporting Information [Line Items]
Segment assets	1,095,410	943,340
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Segment assets	$ 341,907	$ 334,249

XML

Reporting Segments - Additional Information (Detail) - Segment	3 Months Ended
	Mar. 31, 2018	Feb. 07, 2018
Segment Reporting Information [Line Items]
Number of reportable segments	3
Rockies Express Pipeline LLC | Tallgrass Development LP
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		25.01%
Rockies Express Pipeline LLC
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%

XML

Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross		$ 0	$ 140,000
Pawnee Terminal | Subsequent Event
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%
Tallgrass Energy Partners | Pawnee Terminal | Subsequent Event
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 31,000

XML

Label	Element	Value
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	1 year
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 488,919,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	9 months
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 387,826,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	1 year
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 317,235,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	1 year
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 138,686,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	1 year
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 129,548,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod	15 years
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 271,311,000
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date Axis: (nil)
Revenue, Remaining Performance Obligation	us-gaap_RevenueRemainingPerformanceObligation	$ 1,733,525,000