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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, 2013
or
[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to
Commission file number: 001-35666
Summit Midstream Partners, LP
(Exact name of registrant as specified in its charter)

Delaware 
(State or other jurisdiction of  
incorporation or organization)	 	45-5200503 
(I.R.S. Employer
Identification No.)	
 	 	 	
2100 McKinney Avenue, Suite 1250
Dallas, Texas  
(Address of principal executive offices)	 	75201 
(Zip Code)	
 	 	 	
Registrant’s telephone number, including area code: (214) 242-1955	
 	 	 	
Securities registered pursuant to Section 12(b) of the Act:	
 	 	 	
Title of each class	 	Name of exchange on which registered	
Common Units	 	New York Stock Exchange	

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. x  Yes      o  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).
x Yes     o No
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer o	 	 	Accelerated Filer o	
Non-Accelerated Filer x (Do not check if a smaller reporting company)	 	Smaller Reporting Company o	
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). o Yes x No
Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	 	As of April 30, 2013	
Common Units	 	24,412,427 units	
Subordinated Units	 	24,409,850 units	
General Partner Units	 	996,320 units	

TABLE OF CONTENTS

PART I	Financial Information	1	
Item 1.	Financial Statements (Unaudited).	1	
 	Condensed Consolidated Balance Sheets as of March 31, 2013 and December 31, 2012	1	
 	Condensed Consolidated Statements of Operations for the three months ended March 31, 2013 and 2012	2	
 	Condensed Consolidated Statements of Partners' Capital and Membership Interests for the three months ended March 31, 2013 and 2012	3	
 	Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2013 and 2012	4	
 	Notes to Condensed Consolidated Financial Statements	6	
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations.	17	
Item 3.	Quantitative and Qualitative Disclosures about Market Risk.	29	
Item 4.	Controls and Procedures.	29	
 	 	 	
PART II	Other Information	30	
Item 1.	Legal Proceedings.	30	
Item 1A.	Risk Factors.	30	
Item 6.	Exhibits.	30	

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FORWARD-LOOKING STATEMENTS
Investors are cautioned that certain statements contained in this report as well as in periodic press releases and some oral statements made by our officials during our presentations are “forward-looking” statements. Forward-looking statements include, without limitation, any statement that may project, indicate or imply future results, events, performance or achievements, and may contain the words “expect,” “intend,” “plan,” “anticipate,” “estimate,” “believe,” “will be,” “will continue,” “will likely result,” and similar expressions, or future conditional verbs such as “may,” “will,” “should,” “would,” and “could.” In addition, any statement concerning future financial performance (including future revenues, earnings or growth rates), ongoing business strategies or prospects, and possible actions taken by us or our subsidiaries, are also forward-looking statements. These forward-looking statements involve external risks and uncertainties, including, but not limited to, those described under the section entitled “Risk Factors” included herein.
Forward-looking statements are based on current expectations and projections about future events and are inherently subject to a variety of risks and uncertainties, many of which are beyond the control of our management team.  All forward-looking statements in this report and subsequent written and oral forward-looking statements attributable to us, or to persons acting on our behalf, are expressly qualified in their entirety by these risks and uncertainties.  These risks and uncertainties include, among others:
 	 	
•	changes in general economic conditions;	
 	 	
•	fluctuations in oil, natural gas and natural gas liquids prices;	
 	 	
•	the extent and success of drilling efforts, as well as the extent and quality of natural gas volumes produced within proximity of our assets;	
 	 	
•	failure or delays by our customers in achieving expected production in their natural gas projects;	
 	 	
•	competitive conditions in our industry and their impact on our ability to connect natural gas supplies to our gathering and compression assets or systems;	
 	 	
•	actions or inactions taken or non-performance by third parties, including suppliers, contractors, operators, processors, transporters and customers;	
 	 	
•	our ability to consummate acquisitions, successfully integrate the acquired businesses, realize any cost savings and other synergies from any acquisition;	
 	 	
•	the ability to attract and retain key management personnel;	
 	 	
•	changes in the availability and cost of capital;	
 	 	
•	the availability, terms and cost of downstream transportation and processing services;	
 	 	
•	operating hazards, natural disasters, accidents, weather-related delays, casualty losses and other matters beyond our control;	
 	 	
•	timely receipt of necessary government approvals and permits, our ability to control the costs of construction, including costs of materials, labor and right-of-way and other factors that may impact our ability to complete projects within budget and on schedule;	
 	 	
•	the effects of existing and future laws and governmental regulations, including environmental and climate change requirements;	
 	 	
•	the effects of existing and future litigation; and	
 	 	
•	certain factors discussed elsewhere in this report.	
Developments in any of these areas could cause actual results to differ materially from those anticipated or projected or cause a significant reduction in the market price of our common units. 
The foregoing list of risks and uncertainties may not contain all of the risks and uncertainties that could affect us. In addition, in light of these risks and uncertainties, the matters referred to in the forward-looking statements contained in this document may not in fact occur. Accordingly, undue reliance should not be placed on these statements. We undertake no obligation to publicly update or revise any forward-looking statements as a result of new information, future events or otherwise, except as otherwise required by law.

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PART I—FINANCIAL INFORMATION
Item 1. Financial Statements.
SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

 	March 31,	 	December 31,	
 	2013	 	2012	
 	(Dollars in thousands)	
Assets	 	 	 	
Current assets:	 	 	 	
Cash and cash equivalents	$	2,817	
 	 	$	7,895	
 	
Accounts receivable	34,317	
 	 	33,504	
 	
Due from affiliate	2,712	
 	 	774	
 	
Other assets	1,616	
 	 	2,190	
 	
Total current assets	41,462	
 	 	44,363	
 	
Property, plant and equipment, net	691,718	
 	 	681,993	
 	
Intangible assets, net:	 	 	 	
Favorable gas gathering contracts	19,386	
 	 	19,958	
 	
Contract intangibles	225,866	
 	 	229,596	
 	
Rights-of-way	37,196	
 	 	35,986	
 	
Total intangible assets, net	282,448	
 	 	285,540	
 	
Goodwill	45,478	
 	 	45,478	
 	
Other noncurrent assets	5,736	
 	 	6,137	
 	
Total assets	$	1,066,842	
 	 	$	1,063,511	

Liabilities and Partners' Capital	 	 	 	
Current liabilities:	 	 	 	
Trade accounts payable	$	14,149	
 	 	$	15,817	
 	
Deferred revenue	865	
 	 	865	
 	
Ad valorem taxes payable	1,689	
 	 	5,455	
 	
Other current liabilities	3,309	
 	 	4,324	
 	
Total current liabilities	20,012	
 	 	26,461	
 	
Revolving credit facility	214,230	
 	 	199,230	
 	
Noncurrent liability, net (Note 4)	7,128	
 	 	7,420	
 	
Deferred revenue	13,585	
 	 	10,899	
 	
Other noncurrent liabilities	245	
 	 	254	
 	
Total liabilities	255,200	
 	 	244,264	
 	
Commitments and contingencies (Note 11)	

 	 	 	 	
Common limited partner capital (24,412,427 units issued and outstanding at March 31, 2013 and December 31, 2012)	415,302	
 	 	418,856	
 	
Subordinated limited partner capital (24,409,850 units issued and outstanding at March 31, 2013 and December 31, 2012)	376,276	
 	 	380,169	
 	
General partner interests (996,320 units issued and outstanding at March 31, 2013 and December 31, 2012)	20,064	
 	 	20,222	
 	
Total partners' capital	811,642	
 	 	819,247	
 	
Total liabilities and partners' capital	$	1,066,842	
 	 	$	1,063,511	
 	
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands, except per-unit and unit amounts)	
Revenues:	 	 	 	
Gathering services and other fees	$	38,069	
 	 	$	31,918	
 	
Natural gas and condensate sales	5,806	
 	 	3,731	
 	
Amortization of favorable and unfavorable contracts	(280	)	 	134	
 	
Total revenues	43,595	
 	 	35,783	

Costs and expenses:	 	 	 	
Operation and maintenance	14,004	
 	 	10,989	
 	
General and administrative	5,056	
 	 	4,412	
 	
Transaction costs	8	
 	 	193	
 	
Depreciation and amortization	9,987	
 	 	8,290	
 	
Total costs and expenses	29,055	
 	 	23,884	
 	
Other income	1	
 	 	4	
 	
Interest expense	(1,880	)	 	(695	)	
Affiliated interest expense	—	
 	 	(3,482	)	
Income before income taxes	12,661	
 	 	7,726	
 	
Income tax expense	(181	)	 	(139	)	
Net income	$	12,480	
 	 	$	7,587	
 	
Less: net income attributable to general partner	250	
 	 	 	
Net income attributable to limited partners	$	12,230	

Earnings per common unit – basic	$	0.25	
 	 	 	
Earnings per common unit – diluted	$	0.25	
 	 	 	
Earnings per subordinated unit – basic and diluted	$	0.25	

Weighted-average common units outstanding – basic	24,412,427	
 	 	 	
Weighted-average common units outstanding – diluted	24,455,603	
 	 	 	
Weighted-average subordinated units outstanding – basic and diluted	24,409,850	

Cash distributions declared per common unit	$	0.41	
 	 	 	
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL AND
MEMBERSHIP INTERESTS

 	Partners' capital	 	 	 	 	
 	Limited partners	 	 	 	 	 	 	
 	Common	 	Subordinated	 	General partner	 	Membership interests	 	Total	
 	(In thousands, except per-unit amounts)	
Membership interests, January 1, 2012	$	—	
 	 	$	—	
 	 	$	—	
 	 	$	640,270	
 	 	$	640,270	
 	
Net income	—	
 	 	—	
 	 	—	
 	 	7,587	
 	 	7,587	
 	
Class B membership interest unit-based compensation	—	
 	 	—	
 	 	—	
 	 	460	
 	 	460	
 	
Membership interests, March 31, 2012	$	—	
 	 	$	—	
 	 	$	—	
 	 	$	648,317	
 	 	$	648,317	

Partners' capital, January 1, 2013	$	418,856	
 	 	$	380,169	
 	 	$	20,222	
 	 	$	—	
 	 	$	819,247	
 	
Net income	6,115	
 	 	6,115	
 	 	250	
 	 	—	
 	 	12,480	
 	
SMLP unit-based compensation	327	
 	 	—	
 	 	—	
 	 	—	
 	 	327	
 	
Class B membership interest unit-based compensation	13	
 	 	—	
 	 	—	
 	 	—	
 	 	13	
 	
Distributions to unitholders ($0.41 per unit)	(10,009	)	 	(10,008	)	 	(408	)	 	—	
 	 	(20,425	)	
Partners' capital, March 31, 2013	$	415,302	
 	 	$	376,276	
 	 	$	20,064	
 	 	$	—	
 	 	$	811,642	
 	
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Cash flows from operating activities:	 	 	 	
Net income	$	12,480	
 	 	$	7,587	
 	
Adjustments to reconcile net income to net cash provided by operating activities:	 	 	 	
Depreciation and amortization	9,987	
 	 	8,290	
 	
Amortization of favorable and unfavorable contracts	280	
 	 	(134	)	
Amortization of deferred loan costs	435	
 	 	233	
 	
Pay-in-kind interest on promissory notes payable to Sponsors	—	
 	 	3,482	
 	
Unit-based compensation	340	
 	 	460	
 	
Changes in operating assets and liabilities:	 	 	 	
Accounts receivable	(813	)	 	(3,521	)	
Due from affiliate	(1,938	)	 	—	
 	
Other assets	541	
 	 	571	
 	
Trade accounts payable	2,477	
 	 	(1,671	)	
Change in deferred revenue	2,686	
 	 	3,184	
 	
Ad valorem taxes payable	(3,766	)	 	875	
 	
Other current liabilities	(1,014	)	 	(2,751	)	
Other noncurrrent liabilities	(9	)	 	—	
 	
Net cash provided by operating activities	21,686	
 	 	16,605	

Cash flows from investing activities:	 	 	 	
Capital expenditures	(21,339	)	 	(20,577	)	
Net cash used in investing activities	(21,339	)	 	(20,577	)	
 	 	 	 	
Cash flows from financing activities:	 	 	 	
Distributions to unitholders	(20,425	)	 	—	
 	
Borrowings under revolving credit facility	15,000	
 	 	—	
 	
Initial public offering costs	—	
 	 	(579	)	
Net cash used in financing activities	(5,425	)	 	(579	)	
Net change in cash and cash equivalents	(5,078	)	 	(4,551	)	
Cash and cash equivalents, beginning of period	7,895	
 	 	15,462	
 	
Cash and cash equivalents, end of period	$	2,817	
 	 	$	10,911	
 	
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(continued)

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Supplemental Schedule of Investing and Financing Activities:	 	 	 	
Cash interest paid	$	1,889	
 	 	$	1,695	
 	
Capitalized interest	(493	)	 	(1,321	)	
  Interest paid (net of capitalized interest)	$	1,396	
 	 	$	374	

Cash paid for taxes	$	—	
 	 	$	—	

Supplemental Disclosures of Noncash Investing and Financing Activities:	 	 	 	
Capital expenditures in trade accounts payable (period-end accruals)	$	3,684	
 	 	$	5,629	
 	
Pay-in-kind interest on promissory notes payable to Sponsors	—	
 	 	4,047	
 	
Unit-based compensation	340	
 	 	460	
 	
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES
UNAUDITED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
1. ORGANIZATION AND BUSINESS OPERATIONS
Organization.  Summit Midstream Partners, LP ("SMLP" or the "Partnership"), a Delaware limited partnership, was formed in May 2012 and began operations in October 2012 in connection with its initial public offering ("IPO") of common limited partner units. SMLP is a growth-oriented limited partnership focused on owning and operating midstream energy infrastructure assets that are strategically located in the core producing areas of unconventional resource basins, primarily shale formations, in North America.
Effective with the completion of its IPO on October 3, 2012, SMLP has a 100% ownership interest in Summit Midstream Holdings, LLC ("Summit Holdings") which has a 100% ownership interest in both DFW Midstream Services LLC ("DFW Midstream") and Grand River Gathering, LLC ("Grand River Gathering"). The effects of the IPO and related equity transfers occurring in October 2012 are reflected in SMLP's financial statements. For additional information, see Note 1 to the audited consolidated financial statements included in our annual report on Form 10-K for the year ended December 31, 2012 (the "2012 Annual Report").
Summit Midstream Partners, LLC ("Summit Investments") is a Delaware limited liability company and the predecessor for accounting purposes (the "Predecessor") of SMLP. Summit Investments was formed and began operations in September 2009. Through August 2011, Summit Investments was wholly owned by Energy Capital Partners II, LLC and its parallel and co-investment funds (collectively, "Energy Capital Partners"). In August 2011, Energy Capital Partners sold an interest in Summit Investments to a subsidiary of GE Energy Financial Services, Inc. ("GE Energy Financial Services", and collectively with Energy Capital Partners, the "Sponsors"). In March 2013, Summit Investments contributed the ownership of its SMLP common and subordinated units along with its 2% general partner interest in SMLP to Summit Midstream Partners Holdings, LLC ("SMP Holdings") in exchange for a continuing 100% interest in SMP Holdings.
SMLP is managed and operated by the board of directors and executive officers of Summit Midstream GP, LLC (the "general partner"). Summit Investments, as the ultimate owner of our general partner, has the right to appoint the entire board of directors of our general partner, including our independent directors. SMLP's operations are conducted through, and our operating assets are owned by, various operating subsidiaries. However, neither SMLP nor its subsidiaries has any employees. The general partner has the sole responsibility for providing the personnel necessary to conduct SMLP's operations, whether through directly hiring employees or by obtaining the services of personnel employed by others, including Summit Investments. All of the personnel that conduct SMLP's business are employed by the general partner and its affiliates, but these individuals are sometimes referred to as our employees.
References to the "Company," "we," or "our," when used for dates or periods ended on or after the IPO, refer collectively to SMLP and its subsidiaries. References to the "Company," "we," or "our," when used for dates or periods ended prior to the IPO, refer collectively to Summit Investments and its subsidiaries.
Business Operations. We provide natural gas gathering and compression services pursuant to long-term, fee-based natural gas gathering agreements with our customers. Our results are driven primarily by the volumes of natural gas that we gather and compress across our systems and a significant percentage of our revenue is attributable to three producer customers. We currently operate in two unconventional resource basins:
 	 	
•	the Piceance Basin, which includes the Mesaverde formation and the Mancos and Niobrara shale formations in western Colorado; and	
 	 	
•	the Fort Worth Basin, which includes the Barnett Shale formation in north-central Texas.	
Our two operating subsidiaries are DFW Midstream and Grand River Gathering. Both subsidiaries are midstream energy companies focused on the development, construction and operation of natural gas gathering systems.
Basis of Presentation and Principles of Consolidation. We prepare our unaudited condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"). These principles are established by the Financial Accounting Standards Board. We make estimates and assumptions that affect the reported amounts of assets and liabilities at the balance sheet dates, including fair value measurements, the reported amounts of revenue and expense, and disclosure of contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.
For the purposes of these unaudited condensed consolidated financial statements, SMLP's results of operations reflect the Partnership's operations subsequent to the IPO and the results of the Predecessor for the period prior to

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the IPO. The unaudited condensed consolidated financial statements include the assets, liabilities, and results of operations of SMLP or the Predecessor and their wholly owned subsidiaries Summit Holdings, DFW Midstream and Grand River Gathering. All intercompany transactions among the consolidated entities have been eliminated. In our opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments consisting of normal recurring accruals necessary for a fair presentation of the results of operations for the three months ended March 31, 2013 and 2012.
These unaudited condensed consolidated financial statements have been prepared pursuant to the rules and the regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although the Partnership believes that the disclosures made are adequate to make the information not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto that are included in our 2012 Annual Report. The results of operations for an interim period are not necessarily indicative of results expected for a full year.
Our operations are organized into a single reportable segment, the assets of which consist of natural gas gathering systems and related plant and equipment.
Reclassifications. Certain reclassifications have been made to prior-year amounts to conform to current-year presentation. These reclassifications had no impact on net income or total partners' capital or membership interests.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Fair Value of Financial Instruments.  The carrying amount of cash and cash equivalents, accounts receivable, and accounts payable approximates fair value due to their short-term maturities.
Revenue Recognition. We recognize revenue when all of the following criteria are met: (i) persuasive evidence of an exchange arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) the price is fixed or determinable, and (iv) collectability is reasonably assured.
We earn revenue from the natural gas gathering services that we provide to our natural gas producer customers. We recognize this revenue as gathering services and other fees revenue. We also earn revenue from the sale of physical natural gas retained from our customers and condensate retained from our gathering services. We sell the natural gas that we retain from our DFW Midstream customers to offset the power expenses of the electric-driven compression on the DFW Midstream system. We record these revenue sources as natural gas and condensate sales revenue.
Certain customers reimburse us for costs we incur as outlined in their respective gas gathering contract. We record costs incurred and reimbursed by our customers on a gross basis.
Our natural gas gathering agreements provide a monthly or annual minimum volume commitment ("MVC") from certain of our customers. Under these monthly or annual MVCs, our customers agree to ship a minimum volume of natural gas on our gathering systems or to pay a minimum monetary amount over certain periods during the term of the MVC. A customer must make a shortfall payment to us at the end of the contract month or year, as applicable, if its actual throughput volumes are less than its MVC for that month or year. Certain customers are entitled to utilize shortfall payments to offset gathering fees in one or more subsequent periods to the extent that such customer's throughput volumes in subsequent periods exceed its MVC for that period. These contract provisions range from 12 months to nine years.
We record customer billings for obligations under their MVCs as deferred revenue when the customer has the right to utilize shortfall payments to offset gathering fees in subsequent periods. We recognize deferred revenue under these arrangements in revenue once all contingencies or potential performance obligations associated with the related volumes have either (i) been satisfied through the gathering of future excess volumes of natural gas, or (ii) expired (or lapsed) through the passage of time pursuant to the terms of the applicable natural gas gathering agreement. We classify deferred revenue as short term for arrangements where the expiration of a customer's right to utilize shortfall payments is twelve months or less. As of March 31, 2013, our customers have been billed $14.5 million of shortfall payments, of which $0.8 million was included in accounts receivable as of March 31, 2013, attributable to arrangements that provide the customer the ability to offset gathering fees in the next one month to nine years to the extent that a customer's throughput volumes exceed its MVC.

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Unit-Based Compensation. For awards of unit-based compensation, we determine a grant date fair value and recognize the related compensation expense, adjusted for expected forfeitures, in the statement of operations over the vesting period of the respective awards. See Note 8 for additional information.
Income Taxes.  We are not subject to federal and state income taxes, except as noted below, because we are structured as a partnership. As a result, our unitholders or members are individually responsible for paying federal and state income taxes on their share of our taxable income.
In general, legal entities that are chartered, organized or conducting business in the state of Texas are subject to the Revised Texas Franchise Tax (the "Texas Margin Tax"). The Texas Margin Tax has the characteristics of an income tax because it is determined by applying a tax rate to a tax base that considers both revenues and expenses. Our financial statements reflect provisions for these tax obligations.
Earnings Per Unit ("EPU").  We present earnings per limited partner unit data only for periods subsequent to the closing of SMLP’s IPO in October 2012. EPU for periods ended prior to the IPO have not been presented because Summit Investments' members held membership interests and not units.
We determine EPU by dividing the net income that is attributed, in accordance with the net income and loss allocation provisions of the partnership agreement, to the common and subordinated unitholders under the two-class method, after deducting the general partner's 2% interest in net income and any incentive distributions paid to the general partner, by the weighted-average number of common and subordinated units outstanding during the period from January 1, 2013 to March 31, 2013. Diluted earnings per limited partner unit reflects the potential dilution that could occur if securities or other agreements to issue common units, such as unit-based compensation, were exercised, settled or converted into common units. When it is determined that potential common units resulting from an award subject to performance or market conditions should be included in the diluted earnings per limited partner unit calculation, the impact is reflected by applying the treasury stock method.
Comprehensive Income.  Comprehensive income is the same as net income for all periods presented.
Environmental Matters.  We are subject to various federal, state and local laws and regulations relating to the protection of the environment. Although we believe that we are in material compliance with applicable environmental regulations, the risk of costs and liabilities are inherent in pipeline ownership and operation. Liabilities for loss contingencies, including environmental remediation costs, arising from claims, assessments, litigation, fines, and penalties and other sources are charged to expense when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. There are no such liabilities reflected in the accompanying financial statements at March 31, 2013 or December 31, 2012. However, we can provide no assurances that significant costs and liabilities will not be incurred by the Partnership in the future. We are currently not aware of any material contingent liabilities that exist with respect to environmental matters.
Other Significant Accounting Policies. For information on our other significant accounting policies, see Note 2 of the audited consolidated financial statements included in the 2012 Annual Report.
Recent Accounting Pronouncements.  Accounting standard setters frequently issue new or revised accounting rules. We review new pronouncements to determine the impact, if any, on our financial statements. There are currently no recent pronouncements that have been issued that we believe will materially affect our financial statements.

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3. PROPERTY, PLANT, AND EQUIPMENT, NET
Details on property, plant, and equipment, net were as follows:

 	Useful lives (In years)	 	March 31,	 	December 31,	 	
 	 	 	2013	 	2012	 	
 	(Dollars in thousands)	 	
Gas gathering systems	30	 	$	439,478	
 	 	$	427,449	
 	 	
Compressor stations and compression equipment	30	 	238,456	
 	 	237,618	
 	 	
Construction in progress	n/a	 	48,528	
 	 	45,919	
 	 	
Other	4-15	 	4,675	
 	 	4,524	
 	 	
Total	 	 	731,137	
 	 	715,510	
 	 	
Less accumulated depreciation	 	 	(39,419	)	 	(33,517	)	 	
Property, plant, and equipment, net	 	 	$	691,718	
 	 	$	681,993	
 	 	
Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Depreciation expense related to property, plant and equipment and capitalized interest were as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Depreciation expense	$	5,902	
 	 	$	4,626	
 	
Capitalized interest	493	
 	 	1,321	

4. IDENTIFIABLE INTANGIBLE ASSETS AND NONCURRENT LIABILITY
Identifiable Intangible Assets and Noncurrent Liability. We accounted for the acquisitions of DFW Midstream and Grand River Gathering under the acquisition method of accounting. In connection with these acquisitions, we recognized separately identifiable intangible assets and a noncurrent liability. Identifiable intangible assets and the noncurrent liability, which are subject to amortization, were as follows:

 	March 31, 2013	
 	Useful lives
(In years)	 	Gross carrying amount	 	Accumulated amortization	 	Net	
 	(Dollars in thousands)	
Favorable gas gathering contracts	18.7	 	$	24,195	
 	 	$	(4,809	)	 	$	19,386	
 	
Contract intangibles	12.4	 	244,100	
 	 	(18,234	)	 	225,866	
 	
Rights-of-way	28.3	 	40,413	
 	 	(3,217	)	 	37,196	
 	
Total amortizable intangible assets	 	 	$	308,708	
 	 	$	(26,260	)	 	$	282,448	

Unfavorable gas gathering contract	10.0	 	$	10,962	
 	 	$	(3,834	)	 	$	7,128	

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 	December 31, 2012	
 	Useful lives
(In years)	 	Gross carrying amount	 	Accumulated amortization	 	Net	
 	(Dollars in thousands)	
Favorable gas gathering contracts	18.7	 	$	24,195	
 	 	$	(4,237	)	 	$	19,958	
 	
Contract intangibles	12.4	 	244,100	
 	 	(14,504	)	 	229,596	
 	
Rights-of-way	28.3	 	38,848	
 	 	(2,862	)	 	35,986	
 	
Total amortizable intangible assets	 	 	$	307,143	
 	 	$	(21,603	)	 	$	285,540	

Unfavorable gas gathering contract	10.0	 	$	10,962	
 	 	$	(3,542	)	 	$	7,420	
 	
We recognized amortization expense as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Amortization expense – favorable gas gathering contracts	$	572	
 	 	$	319	
 	
Amortization expense – contract intangibles	3,730	
 	 	3,350	
 	
Amortization expense – rights-of-way	355	
 	 	314	
 	
Amortization expense – unfavorable gas gathering contract	(292	)	 	(453	)	
The estimated aggregate annual amortization of intangible assets and noncurrent liability expected to be recognized as of March 31, 2013 for the remainder of 2013 and each of the four succeeding fiscal years follows.

 	Assets	 	Liabilities	
 	(In thousands)	
2013	$	14,593	
 	 	$	1,098	
 	
2014	22,217	
 	 	1,549	
 	
2015	25,170	
 	 	1,650	
 	
2016	26,549	
 	 	1,571	
 	
2017	25,919	
 	 	1,260	

5. REVOLVING CREDIT FACILITY
We have a senior secured revolving credit facility with total commitments of $550.0 million. The revolving credit facility is secured by the membership interests of Summit Holdings, DFW Midstream and Grand River Gathering and substantially all of Summit Holdings', DFW Midstream's and Grand River Gathering's assets. It is guaranteed by Summit Holdings' subsidiaries. It allows for revolving loans, letters of credit and swingline loans. As of March 31, 2013, the outstanding balance of the revolving credit facility was $214.2 million. The facility matures in May 2016.
Borrowings under the revolving credit facility bear interest at the London Interbank Offered Rate ("LIBOR") plus an applicable margin or a base rate, as defined in the credit agreement. At March 31, 2013, the applicable margin under LIBOR borrowings was 2.50%, the interest rate was 2.71% and the unused portion of the revolving credit facility totaled $335.8 million (subject to a commitment fee of 0.50%).
The revolving credit agreement contains affirmative and negative covenants customary for credit facilities of its size and nature that, among other things, limit or restrict the ability to (i) incur additional debt; (ii) make investments; (iii) engage in certain mergers, consolidations, acquisitions or sales of assets; (iv) enter into swap agreements and power purchase agreements; (v) enter into leases that would cumulatively obligate payments in excess of $30.0 million over any 12-month period; and (vi) prohibits the payment of distributions by Summit Holdings if a default then exists or would result therefrom, and otherwise limits the amount of distributions Summit Holdings can make. In addition, the revolving credit facility requires Summit Holdings to maintain a ratio of consolidated trailing 12-month earnings before interest, income taxes, depreciation and amortization ("EBITDA") to net interest expense of not less than 2.5 to 1.0 (as defined in the credit agreement) and a ratio of total indebtedness to consolidated trailing 12-

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month EBITDA of not more than 5.0 to 1.0, or not more than 5.5 to 1.0 for up to six months following certain acquisitions (as defined in the credit agreement). As of March 31, 2013, we were in compliance with the covenants in the revolving credit facility. There were no defaults during the three-month period ended March 31, 2013.
The revolving credit facility’s carrying value on the balance sheet is its fair value due to its floating rate.

6. PARTNERS' CAPITAL AND MEMBERSHIP INTERESTS
Partners' Capital
SMLP was formed in May 2012. Prior to the closing of its IPO on October 3, 2012, SMLP had no outstanding common or subordinated units or operations.
The principal difference between our common units and subordinated units is that in any quarter during the subordination period, holders of the subordinated units are not entitled to receive any distribution of available cash until the common units have received the minimum quarterly distribution plus any arrearages in the payment of the minimum quarterly distribution from prior quarters. Subordinated units will not accrue arrearages for unpaid quarterly distributions or quarterly distributions less than the minimum quarterly distribution. If we do not pay the minimum quarterly distribution on our common units, our common unitholders will not be entitled to receive such payments in the future except during the subordination period. To the extent we have available cash in any future quarter during the subordination period in excess of the amount necessary to pay the minimum quarterly distribution to holders of our common units, we will use this excess available cash to pay any distribution arrearages related to prior quarters before any cash distribution is made to holders of subordinated units. When the subordination period ends, all subordinated units will convert into common units on a one-for-one basis, and thereafter no common units will be entitled to arrearages.
The subordination period will end on the first business day after we have earned and paid at least (1) $1.60 (the minimum quarterly distribution on an annualized basis) on each outstanding common unit and subordinated unit and the corresponding distribution on the general partner's 2.0% interest for each of three consecutive, non-overlapping four-quarter periods ending on or after December 31, 2015 or (2) $2.40 (150.0% of the annualized minimum quarterly distribution) on each outstanding common unit and subordinated unit and the corresponding distributions on the general partner's 2.0% interest and the related distribution on the incentive distribution rights for the four-quarter period immediately preceding that date, in each case provided there are no arrearages on the common units at that time.
Our partnership agreement requires that we distribute all of our available cash (as defined below) within 45 days after the end of each quarter to unitholders of record on the applicable record date. On January 23, 2013, the board of directors of our general partner declared a distribution of $0.41 per unit for the quarterly period ended December 31, 2012. The distribution, which totaled $20.4 million, was paid on February 14, 2013 to unitholders of record at the close of business on February 7, 2013.
On April 25, 2013, the board of directors of our general partner declared a distribution of $0.42 per unit for the quarterly period ended March 31, 2013. The distribution, which totaled $20.9 million, will be paid on May 15, 2013 to unitholders of record at the close of business on May 8, 2013.
Cash Distribution Policy
Our partnership agreement requires that we distribute all of our available cash quarterly. Our policy is to distribute to our unitholders an amount of cash each quarter that is equal to or greater than the minimum quarterly distribution stated in our partnership agreement.
Minimum Quarterly Distribution.Our partnership agreement generally requires that we make a minimum quarterly distribution to the holders of our common units and subordinated units of $0.40 per unit, or $1.60 on an annualized basis, to the extent we have sufficient cash from our operations after the establishment of cash reserves and the payment of costs and expenses, including reimbursements of expenses to our general partner. The amount of distributions paid under our policy and the decision to make any distribution is determined by our general partner, taking into consideration the terms of our partnership agreement.
Definition of Available Cash.Available cash generally means, for any quarter, all cash on hand at the end of that quarter:
 	 	
•	less the amount of cash reserves established by our general partner at the date of determination of available cash for that quarter to:	

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•	provide for the proper conduct of our business (including reserves for our future capital expenditures and anticipated future debt service requirements);	
 	 	
•	comply with applicable law, any of our debt instruments or other agreements; or	
 	 	
•	provide funds for distributions to our unitholders and to our general partner for any one or more of the next four quarters (provided that our general partner may not establish cash reserves for distributions unless it determines that the establishment of reserves will not prevent us from distributing the minimum quarterly distribution on all common units and any cumulative arrearages on such common units for the current quarter);	
 	 	
•	plus, if our general partner so determines, all or any portion of the cash on hand on the date of determination of available cash for the quarter resulting from working capital borrowings made subsequent to the end of such quarter.	
General Partner Interest and Incentive Distribution Rights.Our general partner is entitled to 2.0% of all distributions that we make prior to our liquidation. Our general partner has the right, but not the obligation, to contribute a proportionate amount of capital to us to maintain its current general partner interest. Our general partner's initial 2.0% interest in our distributions will be reduced if we issue additional units in the future and our general partner does not contribute a proportionate amount of capital to us to maintain its 2.0% general partner interest.
Our general partner also currently holds incentive distribution rights that entitle it to receive increasing percentage allocations, up to a maximum of 50.0% (as set forth in the chart below), of the cash we distribute from operating surplus in excess of $0.46 per unit per quarter. The maximum distribution of 50.0% includes distributions paid to our general partner on its 2.0% general partner interest and assumes that our general partner maintains its general partner interest at 2.0%. The maximum distribution of 50.0% does not include any distributions that our general partner may receive on any common or subordinated units that it owns.
Percentage Allocations of Available Cash. The following table illustrates the percentage allocations of available cash between the unitholders and our general partner based on the specified target distribution levels. The amounts set forth in the column Marginal Percentage Interest in Distributions are the percentage interests of our general partner and the unitholders in any available cash we distribute up to and including the corresponding amount in the column Total Quarterly Distribution Per Unit Target Amount. The percentage interests shown for our unitholders and our general partner for the minimum quarterly distribution are also applicable to quarterly distribution amounts that are less than the minimum quarterly distribution. The percentage interests set forth below for our general partner include its 2.0% general partner interest and assume that our general partner has contributed any additional capital necessary to maintain its 2.0% general partner interest, our general partner has not transferred its incentive distribution rights and that there are no arrearages on common units.

 	Total quarterly distribution per unit target amount	 	Marginal percentage interest in distributions	 	
 	 	 	Unitholders	 	General partner	 	
Minimum quarterly distribution	$0.40	 	98.0%	 	2.0%	 	
First target distribution	$0.40 up to $0.46	 	98.0%	 	2.0%	 	
Second target distribution	above $0.46 up to $0.50	 	85.0%	 	15.0%	 	
Third target distribution	above $0.50 up to $0.60	 	75.0%	 	25.0%	 	
Thereafter	above $0.60	 	50.0%	 	50.0%	 	
Membership Interests
Energy Capital Partners and GE Energy Financial Services hold membership interests in Summit Investments. Such membership interests give them the right to participate in distributions and to exercise the other rights or privileges available to each entity under Summit Investments' Amended and Restated Limited Liability Operating Agreement (the "Summit LLC Agreement"). In addition, certain members of Summit Investments’ management hold ownership interests in the form of Class B membership interests (the "SMP Net Profits Interests") through their ownership in Summit Midstream Management, LLC.
In accordance with the Summit LLC Agreement, capital accounts are maintained for Summit Investments’ members. The capital account provisions of the Summit LLC Agreement incorporate principles established for U.S. federal income tax purposes and as such are not comparable to the equity accounts reflected under GAAP in our consolidated financial statements.

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The Summit LLC Agreement sets forth the calculation to be used in determining the amount and priority of cash distributions that its membership interest holders will receive. Capital contributions required under the Summit LLC Agreement are in proportion to the members' respective percentage ownership interests. The Summit LLC Agreement also contains provisions for the allocation of net earnings and losses to members. For purposes of maintaining partner capital accounts, the Summit LLC Agreement specifies that items of income and loss shall be allocated among the partners in accordance with their respective percentage interests.

7. EARNINGS PER UNIT
The following table presents details on EPU.

 	Three months ended March 31, 2013	
 	(Dollars in thousands, except per-unit amounts)	
Net income	$	12,480	
 	
Less: net income attributable to general partner	250	
 	
Net income attributable to limited partners	$	12,230	

Net income attributable to common units	$	6,115	

Weighted-average common units outstanding – basic	24,412,427	
 	
Earnings per common unit – basic	$	0.25	

Weighted-average common units outstanding – diluted	24,455,603	
 	
Earnings per common unit – diluted	$	0.25	

Net income attributable to subordinated units	$	6,115	

Weighted-average subordinated units outstanding – basic and diluted	24,409,850	
 	
Earnings per subordinated unit – basic and diluted	$	0.25	
 	
The weighted-average number of units used to calculate diluted earnings per common limited partner unit includes the effect of 145,269 phantom units granted in March 2013 to certain key employees pursuant to the 2012 Long-Term Incentive Plan (the "LTIP") as well as an aggregate of 131,558 phantom and restricted units granted in 2012 (see Note 8).

8. UNIT-BASED COMPENSATION
Long-Term Incentive Plan.  The LTIP provides for equity awards to eligible officers, employees, consultants and directors of our general partner and its affiliates, thereby linking the recipients' compensation directly to SMLP’s performance. The LTIP is administered by our general partner's board of directors, though such administration function may be delegated to a committee appointed by the board. A total of 5.0 million common units was reserved for issuance pursuant to and in accordance with the LTIP. As of March 31, 2013, approximately 4.7 million common units remained available for future issuance.
The LTIP provides for the granting, from time to time, of unit-based awards, including common units, restricted units, phantom units, unit options, unit appreciation rights, distribution equivalent rights, profits interest units and other unit-based awards. Grants are made at the discretion of the board of directors or compensation committee of our general partner. The administrator of the LTIP may make grants under the LTIP that contain such terms, consistent with the LTIP, as the administrator may determine are appropriate, including vesting conditions. The administrator of the LTIP may, in its discretion, base vesting on the grantee's completion of a period of service or upon the achievement of specified financial objectives or other criteria or upon a change of control (as defined in the LTIP) or as otherwise described in an award agreement. Termination of employment prior to vesting will result in forfeiture of the awards, except in limited circumstances as described in the plan documents. Units that are canceled or forfeited will be available for delivery pursuant to other awards.

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The following table presents phantom and restricted unit activity:

 	 	 	Three months ended March 31, 2013	
Nonvested phantom and restricted units, beginning of period	 	 	131,558	
 	
Phantom units granted	 	 	145,269	
 	
Nonvested phantom and restricted units, end of period	 	 	276,827	
 	
In March 2013, the board of directors of our general partner granted 145,269 phantom units with distribution equivalent rights to certain key employees that provide services for us. A phantom unit is a notional unit that entitles the grantee to receive a common unit upon the vesting of the phantom unit or on a deferred basis upon specified future dates or events or, in the discretion of the administrator, cash equal to the fair market value of a common unit. Distribution equivalent rights for each phantom unit provide for a lump sum cash amount equal to the accrued distributions from the grant date to be paid in cash upon the vesting date. The phantom units granted in March 2013 vest ratably over a three-year period. Upon vesting, awards may be settled in cash and/or common units, at the discretion of the board of directors.
The grant date fair value of the phantom unit awards, based on a per-unit fair value of $25.99, was $3.8 million. Compensation expense related to the March 2013 awards recognized for the three months ended March 31, 2013 was approximately $0.1 million.
Upon vesting, management intends to settle all phantom unit awards with common units. As of March 31, 2013, the unrecognized non-cash compensation expense related to the phantom units granted in March 2013 was $3.7 million. Incremental non-cash compensation expense will be recorded over the remaining vesting period of 2.96 years. No forfeitures were assumed in the determination of estimated compensation expense due to a lack of history.
In October 2012, in connection with our IPO, the board of directors of our general partner granted 125,000 phantom units. Compensation expense related to the October 2012 awards recognized for the three months ended March 31, 2013 was approximately $0.2 million. As of March 31, 2013, the unrecognized non-cash compensation expense related to the phantom units granted in October 2012 was $2.1 million. Incremental non-cash compensation expense will be recorded over the remaining vesting period of 2.5 years. No forfeitures were assumed in the determination of estimated compensation expense due to a lack of history.
DFW Net Profits Interests.  Class B membership interests in DFW Midstream (the "DFW Net Profits Interests") participate in distributions upon time vesting and the achievement of certain distribution targets to Class A members or higher priority vested DFW Net Profits Interests. The DFW Net Profits Interests are accounted for as compensatory awards. All grants vest ratably and provide for accelerated vesting in certain limited circumstances, including a qualifying termination following a change in control (as defined in the underlying award agreement and the DFW Midstream Amended and Restated Limited Liability Company Agreement and Contribution Agreement).
Information regarding the amount and grant date fair value of the vested and nonvested DFW Net Profits Interests was as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	Percentage interest	 	Weighted-average grant date fair value (per 1.0% of DFW Net Profits Interest)	 	Percentage interest	 	Weighted-average grant date fair value (per 1.0% of DFW Net Profits Interest)	
 	(Dollars in thousands)	
Nonvested, beginning of period	0.038	%	 	$	1,650	
 	 	1.750	%	 	$	306	
 	
Vested	0.006	%	 	$	1,650	
 	 	0.275	%	 	$	277	
 	
Nonvested, end of period	0.031	%	 	$	1,650	
 	 	1.475	%	 	$	311	
 	
Vested, end of period	4.100	%	 	$	243	
 	 	2.925	%	 	$	260	

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We recognize non-cash compensation expense ratably over the respective award's vesting period. Non-cash compensation expense recognized in general and administrative expense related to the DFW Net Profits Interests was as follows:

 	 	Three months ended March 31,	
 	 	2013	 	2012	
 	 	(In thousands)	
Non-cash compensation expense	 	$	13	
 	 	$	153	
 	
As of March 31, 2013, the unrecognized non-cash compensation expense related to the DFW Net Profits Interests was $0.1 million. Beginning in October 2012 and continuing into April 2013, we entered into a series of exchange agreements with the seven holders of the then-outstanding DFW Net Profits Interests whereby we exchanged $12.2 million for their vested DFW Net Profits Interests and 7,393 SMLP restricted units for their unvested DFW Net Profits Interests. As a result of these exchange transactions, there were no remaining or outstanding DFW Net Profits Interests as of April 30, 2013.
SMP Net Profits Interests.  SMP Net Profits Interests participate in distributions upon time vesting and the achievement of certain distribution targets to Class A members or higher priority vested SMP Net Profits Interests. The SMP Net Profits Interests are accounted for as compensatory awards. All grants vest ratably and provide for accelerated vesting in certain limited circumstances, including a qualifying termination following a change in control (as defined in the underlying award agreement and Summit LLC Agreement).
Information regarding the amount and grant-date fair value of the vested and nonvested SMP Net Profits Interests was as follows:

 	Three months ended March 31,	
 	2012	
 	Percentage interest	 	Weighted-average grant date fair value (per 1.0% of SMP Net Profits Interest)	
 	(Dollars in thousands)	
Nonvested, beginning of period	3.958	%	 	$	1,003	
 	
Granted	0.500	%	 	$	1,780	
 	
Vested	0.318	%	 	$	965	
 	
Nonvested, end of period	4.141	%	 	$	1,010	
 	
Vested, end of period	2.215	%	 	$	712	
 	
We recognize non-cash compensation expense ratably over the respective award's vesting period. Non-cash compensation expense recognized in general and administrative expense related to the SMP Net Profits Interests was as follows:

 	 	Three months ended March 31, 2012	
 	 	(In thousands)	
Non-cash compensation expense	 	$	307	
 	
The expense recognition of these awards is not reflected in SMLP's financial statements subsequent to the IPO because Summit Investments is not consolidated by SMLP.

9. CONCENTRATIONS OF RISK
Financial instruments that potentially subject us to concentrations of credit risk consist of cash and accounts receivable. We maintain our cash in bank deposit accounts that, at times, may exceed federally insured limits. We have not experienced any losses in such accounts and do not believe we are exposed to any significant risk.

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Accounts receivable are primarily from natural gas producers shipping natural gas. This industry concentration has the potential to impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic, industry or other conditions. We monitor the creditworthiness of our counterparties and generally require letters of credit for receivables from customers that are judged to have sub-standard credit, unless the credit risk can otherwise be mitigated.
Customers accounting for more than 10% of total revenues were as follows:

 	Three months ended March 31,	
 	2013	 	2012	
Revenue:	 	 	 	
Customer A	27	%	 	16	%	
Customer B	*	
 	 	18	%	
Customer C	24	%	 	31	%	
__________
* Customer did not exceed 10%.
Customers accounting for more than 10% of total accounts receivable were as follows:

 	March 31,	 	December 31,	
 	2013	 	2012	
Accounts receivable:	 	 	 	
Customer A	29	%	 	24	%	
Customer B	*	
 	 	*	
 	
Customer C	35	%	 	38	%	
__________
* Customer did not exceed 10%.

10. RELATED-PARTY TRANSACTIONS
General and Administrative Expense Allocation. Our general partner and its affiliates do not receive any management fee or other compensation in connection with the management of our business, but will be reimbursed for expenses incurred on our behalf. Under our partnership agreement, we reimburse our general partner and its affiliates for certain expenses incurred on our behalf, including, without limitation, salary, bonus, incentive compensation and other amounts paid to our general partner's employees and executive officers who perform services necessary to run our business. In addition, we reimburse our general partner for compensation, travel and entertainment expenses for the directors serving on the board of directors of our general partner and the cost of director and officer liability insurance. Our partnership agreement provides that our general partner will determine in good faith the expenses that are allocable to us. During the three months ended March 31, 2013, we incurred approximately $1.2 million of expenses that were allocated to us by the general partner under our partnership agreement. As of March 31, 2013, we had a $2.7 million receivable from our general partner for expenses that we paid that were not allocated to the Partnership.
Electricity Management Services Agreement.We entered into a consulting arrangement with Equipower Resources Corp. to assist with managing DFW Midstream's electricity price risk. Equipower Resources Corp. is an affiliate of our Sponsor, Energy Capital Partners. Amounts paid for such services were as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Payments for electricity management consulting services	$	55	
 	 	$	44	

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11. COMMITMENTS AND CONTINGENCIES
Operating Leases. We lease various office space to support our operations and have determined that our leases are operating leases. Total rent expense related to operating leases, which is recognized in general and administrative expenses, was as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Total rent expense	$	194	
 	 	$	137	
 	
Legal Proceedings. Although we may, from time to time, be involved in litigation and claims arising out of our operations in the normal course of business, except as described below, we are not currently a party to any significant legal or governmental proceedings.  In addition, we are not aware of any significant legal or governmental proceedings contemplated to be brought against us, under the various environmental protection statutes to which we are subject.
In August 2012, four former DFW Midstream employees (the "Plaintiffs") who, by virtue of their Class B membership in DFW Midstream Management LLC ("DFW Management"), collectively owned an aggregate 4.1% vested net profits interests in DFW Midstream, filed a claim in the Court of Chancery of the State of Delaware against Summit Investments, Summit Holdings, DFW Midstream and DFW Management (collectively, the "Defendants") seeking dissolution and wind-up of DFW Midstream and DFW Management or, in the alternative, a repurchase of the Plaintiffs' net profits interests. The Plaintiffs also sought other unspecified monetary damages, including attorneys' fees and costs. The complaint alleged that the Defendants breached (i) the DFW Midstream limited liability company agreement; (ii) compensatory arrangements with each Plaintiff; (iii) the implied covenant of good faith and fair dealing; and (iv) in the case of Summit Investments and Summit Holdings, their alleged fiduciary duties to the Plaintiffs. The complaint further alleged that the Defendants acted fraudulently with respect to the Plaintiffs. In September 2012, the Defendants filed a motion to dismiss all of Plaintiffs’ claims in this matter.  The court heard oral arguments on the motion to dismiss in December 2012, and Defendants' motion to dismiss was granted in March 2013. The Plaintiffs filed a notice of appeal to the Supreme Court of Delaware on April 24, 2013. On April 30, 2013, the Plaintiffs voluntarily dismissed their appeal.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.
This Management’s Discussion and Analysis of Financial Condition and Results of Operations ("MD&A") is intended to inform the reader about matters affecting the financial condition and results of operations of SMLP and its subsidiaries for the period since December 31, 2012. As a result, the following discussion should be read in conjunction with the MD&A and the audited consolidated financial statements and related notes that are included in our 2012 Annual Report on Form 10-K (the "2012 Annual Report"). Among other things, those financial statements and the related notes include more detailed information regarding the basis of presentation for the following information. This discussion contains forward-looking statements that constitute our plans, estimates and beliefs. These forward-looking statements involve numerous risks and uncertainties, including, but not limited to, those discussed in "Risk Factors" in the 2012 Annual Report. Actual results may differ materially from those contained in any forward-looking statements.

Overview
We are a growth-oriented limited partnership focused on owning and operating midstream energy infrastructure assets that are strategically located in the core producing areas of unconventional resource basins, primarily shale formations, in North America. We currently provide fee-based natural gas gathering and compression services in two unconventional resource basins: (i) the Piceance Basin, which includes the Mesaverde formation and the Mancos and Niobrara shale formations in western Colorado; and (ii) the Fort Worth Basin, which includes the Barnett Shale formation in north-central Texas.
We generate a substantial majority of our revenue under long-term, fee-based natural gas gathering agreements. Substantially all of our gas gathering agreements are underpinned by areas of mutual interest and minimum volume commitments. Our areas of mutual interest cover approximately 330,000 acres in the aggregate, have original terms

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that range from six years to 24 years, and provide that any natural gas producing wells drilled by our customers within the areas of mutual interest will be shipped on our gathering systems. The minimum volume commitments, which totaled 2.3 Tcf at March 31, 2013 and average approximately 626 MMcf/d through 2020, are designed to ensure that we will generate a certain amount of revenue from each customer over the life of the respective gas gathering agreement, whether by collecting gathering fees on actual throughput or from cash payments to cover any minimum volume commitment shortfall. Our minimum volume commitments have remaining terms that range from seven to 15 years and, as of March 31, 2013, had a weighted-average remaining life of 10.9 years, assuming minimum throughput volumes for the remainder of the term. The fee-based nature of these agreements enhances the stability of our cash flows by limiting our direct commodity price exposure. For additional information, see the Our Operations section included in the 2012 Annual Report.

Trends and Outlook
Our business has been, and we expect our future business to continue to be, affected by the following key trends:
 	 	
•	Natural gas supply and demand dynamics;	
 	 	
•	Growth in production from U.S. shale plays;	
 	 	
•	Interest rate environment; and	
 	 	
•	Rising operating costs and inflation.	
Our expectations are based on assumptions made by us and information currently available to us. To the extent our underlying assumptions about, or interpretations of, available information prove to be incorrect, our actual results may vary materially from our expected results. For additional information, see the Trends and Outlook section included in the 2012 Annual Report.

How We Evaluate Our Operations
We manage our business and analyze our results of operations as a single business segment. Our management uses a variety of financial and operational metrics to analyze our performance. We view these metrics as important factors in evaluating our profitability and review these measurements on a regular basis for consistency and trend analysis. These metrics include:
 	 	
•	throughput volume;	
 	 	
•	operation and maintenance expenses;	
 	 	
•	EBITDA and adjusted EBITDA; and	
 	 	
•	distributable cash flow.	
Throughput Volume
The volume of natural gas that we gather depends on the level of production from natural gas wells connected to the Grand River and DFW Midstream systems. Aggregate production volumes are impacted by the overall amount of drilling and completion activity, as production must be maintained or increased by new drilling or other activity, because the production rate of a natural gas well declines over time.
As a result, we must continually obtain new supplies of natural gas to maintain or increase the throughput volume on our systems. Our ability to maintain or increase throughput volumes from existing customers and obtain new supplies of natural gas is impacted by:
 	 	
•	successful drilling activity within our areas of mutual interest;	
 	 	
•	the level of work-overs and recompletions of wells on existing pad sites to which our gathering systems are connected;	
 	 	
•	the number of new pad sites in our areas of mutual interest awaiting connections;	
 	 	
•	our ability to compete for volumes from successful new wells in the areas in which we operate outside of our existing areas of mutual interest; and	
 	 	
•	our ability to gather natural gas that has been released from commitments with our competitors.	

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Operation and Maintenance Expenses
We seek to maximize the profitability of our operations in part by minimizing, to the extent appropriate, expenses directly tied to operating and maintaining our assets. Direct labor costs, compression costs, insurance costs, ad valorem and property taxes, repair and non-capitalized maintenance costs, integrity management costs, utilities and contract services comprise the most significant portion of our operation and maintenance expense. Other than utilities expense, these expenses are relatively stable and largely independent of volumes delivered through our gathering systems but may fluctuate depending on the activities performed during a specific period.
The majority of the compressors on our DFW Midstream system are electric driven and power costs are directly correlated to the run-time of these compressors, which depends directly on the volume of natural gas gathered. As part of our contracts with our DFW Midstream system customers, we physically retain a percentage of throughput volumes that we subsequently sell to offset the power costs we incur. In addition, we pass along the fees associated with costs we incur on behalf of certain DFW Midstream system customers to deliver pipeline quality natural gas to third-party pipelines. With respect to the Grand River system, we either (i) consume physical gas on the system to operate our gas-fired compressors or (ii) charge our customers for the power costs we incur to operate our electric-drive compressors.
EBITDA, Adjusted EBITDA and Distributable Cash Flow
We define EBITDA as net income, plus interest expense, income tax expense, and depreciation and amortization expense, less interest income and income tax benefit. We define adjusted EBITDA as EBITDA plus non-cash compensation expense and adjustments related to MVC shortfall payments. We define distributable cash flow as adjusted EBITDA plus cash interest income, less cash paid for interest expense and income taxes and maintenance capital expenditures.
EBITDA, adjusted EBITDA and distributable cash flow are used as supplemental financial measures by our management and by external users of our financial statements such as investors, commercial banks, research analysts and others.
EBITDA and adjusted EBITDA are used to assess:
 	 	
•	the financial performance of our assets without regard to financing methods, capital structure or historical cost basis;	
 	 	
•	the ability of our assets to generate cash sufficient to support our indebtedness and make cash distributions to our unitholders and general partner;	
 	 	
•	our operating performance and return on capital as compared to those of other companies in the midstream energy sector, without regard to financing or capital structure; and	
 	 	
•	the attractiveness of capital projects and acquisitions and the overall rates of return on alternative investment opportunities.	
In addition, adjusted EBITDA is used to assess:
 	 	
•	the financial performance of our assets without regard to the impact of the timing of minimum volume commitments shortfall payments under our gas gathering agreements or the impact of non-cash compensation expense.	
Distributable cash flow is used to assess:
 	 	
•	the ability of our assets to generate cash sufficient to support our indebtedness and make future cash distributions to our unitholders; and	
 	 	
•	the attractiveness of capital projects and acquisitions and the overall rates of return on alternative investment opportunities.	

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Results of Operations
Items Affecting the Comparability of Our Financial Results
SMLP's future results of operations may not be comparable to the historical results of operations for the reasons described below:
 	 	
•	Based on the terms of our partnership agreement, we expect that we will distribute to our unitholders most of the cash generated by our operations. As a result, we expect to fund future capital expenditures from cash and cash equivalents on hand, cash flow generated from our operations, borrowings under our amended and restated revolving credit facility and future issuances of equity and debt securities. Prior to the IPO, we largely relied on internally generated cash flows and capital contributions from the Sponsors to satisfy our capital expenditure requirements.	
 	 	
•	The historical results of operations may not be comparable to our future results of operations largely due to our IPO, which was completed on October 3, 2012. We anticipate incurring approximately $2.5 million (annualized) of general and administrative expenses attributable to operating as a publicly traded partnership. These incremental general and administrative expenses are not reflected in our results of operations prior to the IPO.	

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Results of Operations — Combined Overview
The following table presents certain consolidated and other financial and operating data for the periods indicated.

 	Three months ended
March 31,	 	Change	
 	2013	 	2012	 	$	 	%	
 	(In thousands)	 	 	
Statement of Operations Data:	 	 	 	 	 	 	 	
Revenue:	 	 	 	 	 	 	 	
Gathering services and other fees	$	38,069	
 	 	$	31,918	
 	 	$	6,151	
 	 	19	 %	
Natural gas and condensate sales	5,806	
 	 	3,731	
 	 	2,075	
 	 	56	 %	
Amortization of favorable and unfavorable contracts (1)	(280	)	 	134	
 	 	(414	)	 	(309	)%	
Total revenue	43,595	
 	 	35,783	
 	 	7,812	
 	 	22	 %	
Costs and expenses:	 	 	 	 	 	 	 	
Operation and maintenance	14,004	
 	 	10,989	
 	 	3,015	
 	 	27	 %	
General and administrative	5,056	
 	 	4,412	
 	 	644	
 	 	15	 %	
Transaction costs	8	
 	 	193	
 	 	(185	)	 	(96	)%	
Depreciation and amortization	9,987	
 	 	8,290	
 	 	1,697	
 	 	20	 %	
Total costs and expenses	29,055	
 	 	23,884	
 	 	5,171	
 	 	22	 %	
Other income	1	
 	 	4	
 	 	(3	)	 	(75	)%	
Interest expense	(1,880	)	 	(695	)	 	(1,185	)	 	171	 %	
Affiliated interest expense	—	
 	 	(3,482	)	 	3,482	
 	 	(100	)%	
Income before income taxes	12,661	
 	 	7,726	
 	 	4,935	
 	 	64	 %	
Income tax expense	(181	)	 	(139	)	 	(42	)	 	30	 %	
Net income	$	12,480	
 	 	$	7,587	
 	 	$	4,893	
 	 	64	 %	
Less: net income attributable to the general partner	250	
 	 	 	 	 	 	 	
Net income attributable to the limited partners	$	12,230	

Other Financial Data (2):	 	 	 	 	 	 	 	
EBITDA (3)	$	24,807	
 	 	$	20,055	
 	 	$	4,752	
 	 	24	 %	
Adjusted EBITDA (3)	31,442	
 	 	24,881	
 	 	6,561	
 	 	26	 %	
Capital expenditures (4)	21,339	
 	 	20,577	
 	 	762	
 	 	4	 %	
Distributable cash flow (4)	27,073	
 	 	21,884	
 	 	5,189	
 	 	24	 %	
 	 	 	 	 	 	 	 	
Operating Data:	 	 	 	 	 	 	 	
Miles of pipeline (end of period)	406	
 	 	377	
 	 	29	
 	 	8	 %	
Number of wells (end of period) (5)	2,160	
 	 	2,011	
 	 	149	
 	 	7	 %	
Number of pad sites (end of period)	445	
 	 	436	
 	 	9	
 	 	2	 %	
Aggregate average throughput (MMcf/d)	944	
 	 	912	
 	 	32	
 	 	4	 %	
__________
(1) The amortization of favorable and unfavorable contracts relates to gas gathering agreements that were deemed to be above or below market at the acquisition of the DFW Midstream system. We amortize these contracts on a units-of-production basis over the life of the applicable contract. The life of the contract is the period over which the contract is expected to contribute directly or indirectly to our future cash flows.
(2) See "Non-GAAP Financial Measures" below for additional information on EBITDA, adjusted EBITDA and distributable cash flow as well as their reconciliations to the most directly comparable GAAP financial measure.
(3) EBITDA and adjusted EBITDA include transaction costs. These unusual and non-recurring expenses are settled in cash.
(4) In the fourth quarter of 2012, we began tracking maintenance capital expenditures for the purposes of calculating distributable cash flow. Prior to the fourth quarter of 2012, we did not distinguish between maintenance and expansion capital

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expenditures. For the three months ended March 31, 2012, the calculation of distributable cash flow includes an estimate for the portion of total capital expenditures that were maintenance capital expenditures.
(5) Excludes wells connected to nine central receipt points on the Grand River system that averaged 214 MMcf/d for the three months ended March 31, 2013 and 249 MMcf/d for the three months ended March 31, 2012.
Three Months Ended March 31, 2013 Compared with the Three Months Ended March 31, 2012
Volume. Our revenues are primarily attributable to the volume of natural gas that we gather and compress and the rates we charge for those services. Throughput volumes increased to an average of 944 MMcf/d for the three months ended March 31, 2013, compared with an average of 912 MMcf/d in the prior-year period, and largely reflect the impact of a production curtailment announced in the first quarter of 2012 by one of our largest producer customers. Operating data by system follows:

 	March 31,	
 	2013	 	2012	
Grand River system:	 	 	 	
Miles of pipeline	289	
 	 	268	
 	
Number of wells	1,839	
 	 	1,708	
 	
Number of pad sites	378	
 	 	374	
 	
Aggregate average throughput for the three months ended (MMcf/d)	525	
 	 	593	

DFW Midstream system:	 	 	 	
Miles of pipeline	117	
 	 	109	
 	
Number of wells	321	
 	 	303	
 	
Number of pad sites	67	
 	 	62	
 	
Aggregate average throughput for the three months ended (MMcf/d)	419	
 	 	319	
 	
Grand River system volume throughput declined in the first quarter of 2013 primarily due to lower drilling activity and the natural decline of previously drilled Mancos/Niobrara wells in the Orchard Field. Our gas gathering agreements for the Grand River system include MVCs that, in the aggregate, increase over the next several years. As a result, the lower volume throughput for the Grand River system during the first quarter of 2013 primarily translated into larger MVC shortfall payments.
The increase in DFW Midstream system volume throughput was primarily due to the prior-year impact of the production curtailment noted above. This customer's production levels then resumed subsequent to the first quarter of 2012. Volume throughput for the three months ended March 31, 2013 also benefited from the continued development of the DFW Midstream system, most notably our January 2013 commissioning of a compressor which increased system capacity by 40 MMcf/d.
Revenue. Total revenues increased for the three months ended March 31, 2013, largely due to an increase in gathering services and other fees. Gathering services and other fees increased during the three months ended March 31, 2013, primarily as a result of increased throughput volumes on the DFW Midstream system. The aggregate average throughput rate for the three months ended March 31, 2013 was approximately $0.42 per Mcf, compared with approximately $0.37 per Mcf for the three months ended March 31, 2012. The period-over-period increase was largely driven by the proportionate increase in volumes on our DFW Midstream system which has a higher average gathering fee per Mcf. Additionally, the period-over-period increase in aggregate average throughput rate also benefited from gas gathering agreement provisions which increased the average gas gathering fee per Mcf on our Grand River system beginning in January 2013. These contractual provisions helped offset the financial impact of the volume decreases on the Grand River system. Natural gas and condensate sales increased for the three months ended March 31, 2013, primarily as a result of higher volumes on our DFW Midstream system and an increase quarter over quarter in the prices we were able to obtain for natural gas sales.
Operation and Maintenance Expense. Operation and maintenance expense increasedduring the three months ended March 31, 2013, largely as a result of $1.6 million of higher power-related costs for DFW Midstream, an $0.8 million increase in property tax expenses due to a change in our estimate for property tax expenses in the third quarter of 2012, a $0.5 million increase in carbon dioxide expenses for DFW Midstream, and a $0.6 million increase in field employee costs. Operation and maintenance expense also reflects the impact of a $0.5 million decline in compressor lease and contract maintenance expenses in the first quarter of 2013.

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General and Administrative Expense. General and administrative expense increased during the three months ended March 31, 2013, primarily due to an increase in salaries, benefits and incentive compensation.
Depreciation and Amortization Expense. Depreciation and amortization expense increased during the three months ended March 31, 2013 largely due to an increase in assets placed into service in connection with the development of the DFW Midstream and Grand River systems.
Interest Expense and Affiliated Interest Expense. Interest expense increased during the three months ended March 31, 2013, primarily as a result of higher balances on our revolving credit facility beginning in May 2012 and an increase in commitment fees as a result of the May 2012 amendment and restatement of the revolving credit facility which increased our borrowing capacity by $265.0 million. Affiliated interest expense for the three months ended March 31, 2012 related to the $200.0 million promissory notes that we issued to the Sponsors in connection with the acquisition of the Grand River system in October 2011. The promissory notes were partially prepaid in May 2012 with the remaining balance prepaid in July 2012.

Non-GAAP Financial Measures
EBITDA, adjusted EBITDA and distributable cash flow are not financial measures presented in accordance with accounting principles generally accepted in the United States of America ("GAAP"). We believe that the presentation of these non-GAAP financial measures provides useful information to investors in assessing our financial condition and results of operations.
Net income and net cash provided by operating activities are the GAAP financial measures most directly comparable to EBITDA, adjusted EBITDA and distributable cash flow. Our non-GAAP financial measures should not be considered as alternatives to the most directly comparable GAAP financial measure. Furthermore, each of these non-GAAP financial measures has limitations as an analytical tool because it excludes some but not all items that affect the most directly comparable GAAP financial measure. Some of these limitations include:
 	 	
•	certain items excluded from EBITDA, adjusted EBITDA and distributable cash flow are significant components in understanding and assessing a company's financial performance, such as a company's cost of capital and tax structure;	
 	 	
•	EBITDA, adjusted EBITDA, and distributable cash flow do not reflect our cash expenditures or future requirements for capital expenditures or contractual commitments;	
 	 	
•	EBITDA, adjusted EBITDA, and distributable cash flow do not reflect changes in, or cash requirements for, our working capital needs;	
 	 	
•	although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and EBITDA, adjusted EBITDA and distributable cash flow do not reflect any cash requirements for such replacements; and	
 	 	
•	our computations of EBITDA, adjusted EBITDA and distributable cash flow may not be comparable to other similarly titled measures of other companies.	
We compensate for the limitations of EBITDA, adjusted EBITDA and distributable cash flows as analytical tools by reviewing the comparable GAAP financial measures, understanding the differences between the financial measures and incorporating these data points into our decision-making process.
EBITDA, adjusted EBITDA or distributable cash flow should not be considered in isolation or as a substitute for analysis of our results as reported under GAAP. Because EBITDA, adjusted EBITDA and distributable cash flow may be defined differently by other companies in our industry, our definitions of these non-GAAP financial measures may not be comparable to similarly titled measures of other companies, thereby diminishing their utility.

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Net Income-Basis Non-GAAP Reconciliation.  The following table presents a reconciliation of SMLP's net income to EBITDA, adjusted EBITDA and distributable cash flow for the periods indicated.

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Reconciliation of Net Income to EBITDA, Adjusted EBITDA and Distributable Cash Flow:	 	 	 	
Net income	$	12,480	
 	 	$	7,587	
 	
Add:	 	 	 	
Interest expense	1,880	
 	 	4,177	
 	
Income tax expense	181	
 	 	139	
 	
Depreciation and amortization expense	9,987	
 	 	8,290	
 	
Amortization of favorable and unfavorable contracts	280	
 	 	(134	)	
Less:	 	 	 	
Interest income	1	
 	 	4	
 	
EBITDA (1)	$	24,807	
 	 	$	20,055	
 	
Add:	 	 	 	
Non-cash compensation expense	340	
 	 	460	
 	
Adjustments related to MVC shortfall payments (2)	6,295	
 	 	4,366	
 	
Adjusted EBITDA (1)	$	31,442	
 	 	$	24,881	
 	
Add:	 	 	 	
Interest income	1	
 	 	4	
 	
Less:	 	 	 	
Cash interest paid	1,889	
 	 	1,695	
 	
Cash taxes paid	—	
 	 	—	
 	
Maintenance capital expenditures (3)	2,481	
 	 	1,306	
 	
Distributable cash flow	$	27,073	
 	 	$	21,884	
 	
__________
(1) EBITDA and adjusted EBITDA include transaction costs. These unusual and non-recurring expenses are settled in cash. For additional information, see "Results of Operations" above.
(2) Adjustments related to MVC shortfall payments account for (i) the net increases or decreases in deferred revenue for MVC shortfall payments and (ii) our inclusion of expected annual MVC shortfall payments. We include or will include a proportional amount of these historical or expected minimum volume commitment shortfall payments in each quarter prior to the quarter in which we actually receive the shortfall payment.
(3) Maintenance capital expenditures are cash expenditures (including expenditures for the addition or improvement to, or the replacement of, our capital assets or for the acquisition of existing, or the construction or development of new, capital assets) made to maintain our long-term operating income or operating capacity. In the fourth quarter of 2012, we began tracking maintenance capital expenditures for the purposes of calculating distributable cash flow. Prior to the fourth quarter of 2012, we did not distinguish between maintenance and expansion capital expenditures. For the three months ended March 31, 2012, the calculation of distributable cash flow and adjusted distributable cash flow includes an estimate for the portion of total capital expenditures that were maintenance capital expenditures.

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Cash Flow-Basis Non-GAAP Reconciliation.  The following table presents a reconciliation of SMLP's net cash provided by operating activities to EBITDA, adjusted EBITDA and distributable cash flow for the periods indicated.

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Reconciliation of Net Cash Provided by Operating Activities to EBITDA, Adjusted EBITDA and Distributable Cash Flow:	 	 	 	
Net cash provided by operating activities	$	21,686	
 	 	$	16,605	
 	
Add:	 	 	 	
Interest expense (1)	1,445	
 	 	462	
 	
Income tax expense	181	
 	 	139	
 	
Changes in operating assets and liabilities	1,836	
 	 	3,313	
 	
Less:	 	 	 	
Non-cash compensation expense	340	
 	 	460	
 	
Interest income	1	
 	 	4	
 	
EBITDA (2)	$	24,807	
 	 	$	20,055	
 	
Add:	 	 	 	
Non-cash compensation expense	340	
 	 	460	
 	
Adjustments related to MVC shortfall payments (3)	6,295	
 	 	4,366	
 	
Adjusted EBITDA (2)	$	31,442	
 	 	$	24,881	
 	
Add:	 	 	 	
Interest income	1	
 	 	4	
 	
Less:	 	 	 	
Cash interest paid	1,889	
 	 	1,695	
 	
Cash taxes paid	—	
 	 	—	
 	
Maintenance capital expenditures (4)	2,481	
 	 	1,306	
 	
Distributable cash flow	$	27,073	
 	 	$	21,884	
 	
__________
(1) Interest expense presented in the cash flow-basis non-GAAP reconciliation above differs from the interest expense presented in the net income-basis non-GAAP reconciliation presented earlier due to adjustments for amortization of deferred loan costs and pay-in-kind interest on the promissory notes payable to our Sponsors. For the three months ended March 31, 2013, interest expense excluded $0.4 million of amortization of deferred loan costs. For the three months ended March 31, 2012, interest expense excluded $0.2 million of amortization of deferred loan costs and $3.5 million of pay-in-kind interest.
(2) EBITDA and adjusted EBITDA include transaction costs. These unusual and non-recurring expenses are settled in cash. For additional information, see "Results of Operations" above.
(3) Adjustments related to MVC shortfall payments account for (i) the net increases or decreases in deferred revenue for MVC shortfall payments and (ii) our inclusion of expected annual MVC shortfall payments. We include or will include a proportional amount of these historical or expected minimum volume commitment shortfall payments in each quarter prior to the quarter in which we actually receive the shortfall payment.
(4) Maintenance capital expenditures are cash expenditures (including expenditures for the addition or improvement to, or the replacement of, our capital assets or for the acquisition of existing, or the construction or development of new, capital assets) made to maintain our long-term operating income or operating capacity. In the fourth quarter of 2012, we began tracking maintenance capital expenditures for the purposes of calculating distributable cash flow. Prior to the fourth quarter of 2012, we did not distinguish between maintenance and expansion capital expenditures. For the three months ended March 31, 2012, the calculation of distributable cash flow and adjusted distributable cash flow includes an estimate for the portion of total capital expenditures that were maintenance capital expenditures.

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Liquidity and Capital Resources
In October 2012, we completed an IPO of our common units. For additional information, see Note 1 to the audited consolidated financial statements included in the 2012 Annual Report. In the periods following the IPO, we expect our sources of liquidity to include:
 	 	
•	cash generated from operations;	
 	 	
•	borrowings under the revolving credit facility; and	
 	 	
•	additional issuances of debt and equity securities.	
Cash Flows
The components of the change in cash and cash equivalents were as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Net cash provided by operating activities	$	21,686	
 	 	$	16,605	
 	
Net cash used in investing activities	(21,339	)	 	(20,577	)	
Net cash used in financing activities	(5,425	)	 	(579	)	
Change in cash and cash equivalents	$	(5,078	)	 	$	(4,551	)	
Operating activities.  Cash flows from operating activities increased by $5.1 million for three months ended March 31, 2013 largely as result of the increase in volumes on the DFW Midstream system, partially offset by a decline in volumes on the Grand River system.
Investing activities. Cash flows used in investing activities for the three months ended March 31, 2013 primarily reflect the construction of seven miles of new gathering pipeline across the DFW Midstream system and the connection of four new pad sites as well as the acquisition of previously leased compression assets on the Grand River system. We also commissioned a new 6,000 horsepower electric-drive compressor unit on the DFW Midstream system in early January 2013, which increased system throughput capacity from 410 MMcf/d to 450 MMcf/d. Capital expenditures on the DFW Midstream system were $9.6 million for the three months ended March 31, 2013, compared with $14.6 million for the three months ended March 31, 2012. Capital expenditures on the Grand River system were $11.6 million for the three months ended March 31, 2013, compared with $5.6 million for the three months ended March 31, 2012.
Financing activities. Cash flows used in financing activities for the three months ended March 31, 2013 reflect the distribution declared in respect of the fourth quarter of 2012 and paid in the first quarter of 2013, partially offset by $15.0 million of borrowings against our revolving credit facility. Cash flows used in financing for the three months ended March 31, 2012 included $0.6 million of initial public offering costs.
Off-Balance Sheet Arrangements
We had no off-balance sheet arrangements as of or during the three months ended March 31, 2013.
Capital Requirements
The natural gas gathering segment of the midstream energy business is capital-intensive, requiring significant investment for the maintenance of existing gathering systems and the acquisition or construction and development of new gathering systems and other midstream assets and facilities. Our partnership agreement requires that we categorize our capital expenditures as either:
 	 	
•	maintenance capital expenditures, which are cash expenditures (including expenditures for the addition or improvement to, or the replacement of, our capital assets or for the acquisition of existing, or the construction or development of new, capital assets) made to maintain our long-term operating income or operating capacity; or	
 	 	
•	expansion capital expenditures, which are cash expenditures incurred for acquisitions or capital improvements that we expect will increase our operating income or operating capacity over the long term.	

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Total capital expenditures were as follows:

 	Three months ended March 31,	
 	2013	 	2012	
 	(In thousands)	
Capital expenditures	$	21,339	
 	 	$	20,577	

For the three months ended March 31, 2013, total capital expenditures were largely the result of the construction of new pipeline and compression infrastructure to connect new pad sites on our DFW Midstream system and the acquisition of previously leased compression assets for our Grand River system. For the three months ended March 31, 2012, total capital expenditures were largely the result of the construction of new pipeline and compression infrastructure to connect new pad sites on our DFW Midstream system.
In the fourth quarter of 2012, we began tracking maintenance capital expenditures for the purposes of calculating distributable cash flow. Prior to the fourth quarter of 2012, we did not distinguish between maintenance and expansion capital expenditures. As a result, our calculation of distributable cash flow reflects an estimate for the portion of these expenditures that were maintenance capital expenditures in periods prior to the fourth quarter of 2012.
We anticipate that we will continue to make significant expansion capital expenditures in the future. Consequently, our ability to develop and maintain sources of funds to meet our capital requirements is critical to our ability to meet our growth objectives. We expect that our future expansion capital expenditures will be funded by borrowings under the revolving credit facility and the issuance of debt and equity securities.
Distributions
Based on the terms of SMLP’s partnership agreement, SMLP expects that it will distribute to its unitholders most of the cash generated by its operations. As a result, SMLP expects to fund future capital expenditures from cash and cash equivalents on hand, non-distributed cash flow generated from its operations, borrowings under the revolving credit facility and future issuances of equity and debt securities. Historically, the Predecessor largely relied on internally generated cash flows and capital contributions from Energy Capital Partners and GE Energy Financial Services to satisfy its capital expenditure requirements.
On January 23, 2013, the board of directors of our general partner declared a distribution of $0.41 per unit for the quarterly period ended December 31, 2012. The distribution, which totaled $20.4 million, was paid on February 14, 2013 to unitholders of record at the close of business on February 7, 2013.
On April 25, 2013, the board of directors of our general partner declared a distribution of $0.42 per unit for the quarterly period ended March 31, 2013. The distribution, which totaled $20.9 million, will be paid on May 15, 2013 to unitholders of record at the close of business on May 8, 2013.
Revolving Credit Facility
We have a revolving credit facility with a syndicate of lenders and a borrowing capacity of $550.0 million. Substantially all of SMLP’s assets are pledged as collateral under the revolving credit facility. It matures in May 2016 and, at our option, borrowings thereunder bear interest at a variable rate per annum equal to either (i) the London InterBank Offered Rate plus the applicable margins ranging from 2.5% to 3.5% or (ii) a base rate plus the applicable margins ranging from 1.5% to 2.5%.
The revolving credit facility contains affirmative and negative covenants customary for credit facilities of its size and nature, that, among other things, limit or restrict our ability (as well as the ability of our subsidiaries) to:
 	 	
•	permit the ratio of our trailing 12-month EBITDA to our consolidated cash interest charges as of the end of any fiscal quarter to be less than 2.50 to 1.00;	
 	 	
•	permit the ratio of our consolidated net debt to trailing 12-month EBITDA on the last day of any quarter to be above 5.00 to 1.00 (or 5.50 to 1.00 if we have made certain business acquisitions);	
 	 	
•	incur any additional debt, subject to customary exceptions for certain permitted additional debt, or incur liens on assets, subject to customary exceptions for permitted liens;	
 	 	
•	make any investments, subject to customary exceptions for certain permitted investments;	

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•	engage in certain mergers, consolidations, sales of assets or acquisitions, subject to customary exceptions for permitted transactions of such types;	
 	 	
•	pay dividends or make cash distributions, provided that we may make quarterly distributions to our unitholders, so long as no default or event of default under the amended and restated credit agreement then exists or would result therefrom, and subject to compliance (on both a pro forma basis and after giving effect to the making of such distribution) with our financial performance covenants under the amended and restated credit agreement;	
 	 	
•	enter into any swap agreements or power purchase agreements, subject to customary exceptions, such as the entry into swap agreements and power purchase agreements in the ordinary course of business; and	
 	 	
•	enter into leases that would cumulatively obligate payments in excess of $30.0 million over any 12-month period.	
As of March 31, 2013, we were in compliance with the financial and other covenants in our revolving credit facility.
The revolving credit facility also contains events of default customary for credit facilities of its size and nature, including, but not limited to:
 	 	
•	events of default resulting from our failure to comply with covenants;	
 	 	
•	the occurrence of a change of control of our general partner;	
 	 	
•	the institution of insolvency or similar proceedings against us;	
 	 	
•	the occurrence of a default under any other material indebtedness we may have; and	
 	 	
•	the termination of any one or more or our gas gathering agreements accounting for 25% or more of our revenue that results in a material adverse effect (as defined in the amended and restated credit agreement) and for which a replacement gas gathering agreement with substantially similar terms is not entered into within 30 days after such termination.	
Upon the occurrence of an event of default, subject to the terms and conditions of the revolving credit facility, the lenders may, in addition to exercising other remedies, declare any outstanding principal and any accrued and unpaid interest to be immediately due and payable. There were no defaults during the three months ended March 31, 2013.
We expect to use future borrowings under the revolving credit facility for working capital and other general partnership purposes and capital expenditures. For additional information, see Note 5 to the unaudited condensed consolidated financial statements.
Credit Risk and Customer Concentration
We examine the creditworthiness of third-party customers to whom we extend credit and manage our exposure to credit risk through credit analysis, credit approval, credit limits and monitoring procedures, and for certain transactions, we may request letters of credit, prepayments or guarantees. A significant percentage of our revenue is attributable to three producer customers and one natural gas marketer. For additional information, see Note 9 to the unaudited condensed consolidated financial statements.

Critical Accounting Policies and Estimates
We prepare our financial statements in accordance with GAAP. These principles are established by the Financial Accounting Standards Board. We employ methods, estimates and assumptions based on currently available information when recording transactions resulting from business operations. Our significant accounting policies are described in Note 2 to the unaudited condensed consolidated financial statements.
The estimates that we deem to be most critical to an understanding of our financial position and results of operations are those related to determination of fair value and recognition of deferred revenue. The preparation and evaluation of these critical accounting estimates involve the use of various assumptions developed from management's analyses and judgments. Subsequent experience or use of other methods, estimates or assumptions could produce significantly different results.
There have been no changes in the accounting methodology for items that we have identified as critical accounting estimates during the three months ended March 31, 2013. For additional information regarding critical accounting estimates, see the Critical Accounting Policies and Estimates section of MD&A included in the 2012 Annual Report.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.
Interest Rate Risk
We have exposure to changes in interest rates on our indebtedness associated with the revolving credit facility. The credit markets have recently experienced historical lows in interest rates. As the overall economy strengthens, it is possible that monetary policy will tighten further, resulting in higher interest rates to counter possible inflation. Interest rates on floating rate credit facilities and future debt offerings could be higher than current levels, causing our financing costs to increase accordingly.
A hypothetical 1.0% increase (decrease) in interest rates would have increased (decreased) our interest expense by approximately $0.5 million for the three months ended March 31, 2013.
Commodity Price Risk
Because we currently generate a substantial majority of our revenues pursuant to long-term, fee-based gas gathering agreements that include MVCs and AMIs, our only direct commodity price exposure relates to (i) our sale of physical natural gas we retain from our DFW Midstream customers, (ii) our procurement of electricity to operate our electric-drive compression assets on the DFW Midstream system and (iii) the sale of condensate volumes that we collect on the Grand River system. Our gas gathering agreements with our Barnett Shale customers permit us to retain a certain quantity of natural gas that we sell to offset the power costs we incur to operate our electric-drive compression assets. Our gas gathering agreements with our Grand River customers permit us to retain condensate volumes from the Grand River system gathering lines. We manage our direct exposure to natural gas and power prices through the use of forward power purchase contracts with wholesale power providers that require us to purchase a fixed quantity of power at a fixed heat rate based on prevailing natural gas prices on the Waha Hub Index. Because we also sell our retainage gas at prices that are based on the Waha Hub Index, we have effectively fixed the relationship between our compression electricity expense and natural gas sales. We do not enter into risk management contracts for speculative purposes.

Item 4. Controls and Procedures.
Disclosure Controls and Procedures
SMLP’s management, with the participation of the Chief Executive Officer and Chief Financial Officer of SMLP's general partner, has evaluated the effectiveness of SMLP’s disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as of the end of the period covered by this quarterly report (the "Evaluation Date"). Based on such evaluation, the Chief Executive Officer and Chief Financial Officer of SMLP's general partner have concluded that, as of the Evaluation Date, SMLP’s disclosure controls and procedures are effective.
Changes in Internal Control Over Financial Reporting
There have not been any changes in SMLP’s 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 first fiscal quarter of 2013 that have materially affected, or are reasonably likely to materially affect, SMLP's internal control over financial reporting.

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PART II—OTHER INFORMATION
Item 1. Legal Proceedings.
Although we may, from time to time, be involved in litigation and claims arising out of our operations in the normal course of business, except as described below, we are not currently a party to any significant legal or governmental proceedings.  In addition, we are not aware of any significant legal or governmental proceedings contemplated to be brought against us, under the various environmental protection statutes to which we are subject.
In August 2012, four former DFW Midstream employees (the "Plaintiffs") who, by virtue of their Class B membership in DFW Midstream Management LLC ("DFW Management"), collectively owned an aggregate 4.1% vested net profits interests in DFW Midstream, filed a claim in the Court of Chancery of the State of Delaware against Summit Investments, Summit Holdings, DFW Midstream and DFW Management (collectively, the "Defendants") seeking dissolution and wind-up of DFW Midstream and DFW Management or, in the alternative, a repurchase of the Plaintiffs' net profits interests. The Plaintiffs also sought other unspecified monetary damages, including attorneys' fees and costs. The complaint alleged that the Defendants breached (i) the DFW Midstream limited liability company agreement; (ii) compensatory arrangements with each Plaintiff; (iii) the implied covenant of good faith and fair dealing; and (iv) in the case of Summit Investments and Summit Holdings, their alleged fiduciary duties to the Plaintiffs. The complaint further alleged that the Defendants acted fraudulently with respect to the Plaintiffs. In September 2012, the Defendants filed a motion to dismiss all of Plaintiffs’ claims in this matter.  The court heard oral arguments on the motion to dismiss in December 2012, and Defendants' motion to dismiss was granted in March 2013. The Plaintiffs filed a notice of appeal to the Supreme Court of Delaware on April 24, 2013. On April 30, 2013, the Plaintiffs voluntarily dismissed their appeal.

Item 1A. Risk Factors.
The Risk Factors contained in the 2012 Annual Report are incorporated herein by reference.

Item 6. Exhibits.

Exhibit number	 	Description	
3.1	 	First Amended and Restated Agreement of Limited Partnership of Summit Midstream Partners, LP, dated as of October 3, 2012 (Incorporated herein by reference to Exhibit 3.1 to SMLP's Current Report on Form 8-K dated October 4, 2012 (Commission File No. 001-35666))	
3.2	 	Amended and Restated Limited Liability Company Agreement of Summit Midstream GP, LLC, dated as of October 3, 2012 (Incorporated herein by reference to Exhibit 3.2 to SMLP's Current Report on Form 8-K dated October 4, 2012 (Commission File No. 001-35666))	
10.1	 	First Amendment to Amended and Restated Credit Agreement dated as of August 3, 2012	
10.2	 	Second Amendment to Amended and Restated Credit Agreement dated as of November 1, 2012	
10.3	 	Third Amendment to Amended and Restated Credit Agreement dated as of January 31, 2013	
31.1	 	Rule 13a-14(a)/15d-14(a) Certification, executed by Steven J. Newby, President, Chief Executive Officer and Director	
31.2	 	Rule 13a-14(a)/15d-14(a) Certification, executed by Matthew S. Harrison, Senior Vice President and Chief Financial Officer	
32.1	 	Certifications required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350), executed by Steven J. Newby, President, Chief Executive Officer and Director, and Matthew S. Harrison, Senior Vice President and Chief Financial Officer	
101.INS	*	XBRL Instance Document (1)	
101.SCH	*	XBRL Taxonomy Extension Schema	
101.CAL	*	XBRL Taxonomy Extension Calculation Linkbase	
101.DEF	*	XBRL Taxonomy Extension Definition Linkbase	
101.LAB	*	XBRL Taxonomy Extension Label Linkbase	
101.PRE	*	XBRL Taxonomy Extension Presentation Linkbase	

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* Pursuant to Rule 406T of Regulation S-T, the Interactive Data Files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections. The financial information contained in the XBRL(eXtensible Business Reporting Language)-related documents is unaudited and unreviewed.
(1) Includes the following unaudited materials contained in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, formatted in XBRL: (i) Condensed Consolidated Balance Sheets, (ii) Condensed Consolidated Statements of Operations, (iii) Condensed Consolidated Statements of Partners' Capital and Membership Interests, (iv) Condensed Consolidated Statements of Cash Flows, and (v) Notes to Condensed Consolidated Financial Statements.

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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.

 	Summit Midstream Partners, LP	
 	(Registrant)	
 	 	
May 14, 2013	By: Summit Midstream GP, LLC (its general partner)	
 	 	
 	/s/ Matthew S. Harrison	
 	Matthew S. Harrison, Senior Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)	

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EXHIBIT 10.1

FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT

This FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT, dated as of August 3, 2012 (this “ Amendment ”), is entered into by and among Summit Midstream Holdings, LLC (the “ Borrower ”), The Royal Bank of Scotland plc (“ RBS ”), as the Administrative Agent (the “ Administrative Agent ”), and the Required Lenders party hereto. Capitalized terms used herein and not otherwise defined herein shall have the meanings given to them in the Credit Agreement (as defined below).

RECITALS

WHEREAS, the parties hereto are parties to that certain Amended and Restated Credit Agreement, dated as of May 7, 2012 (as the same may from time to time be amended, amended and restated, supplemented or otherwise modified, the “ Credit Agreement ”), by and among the Borrower, the Administrative Agent, RBS, as the Collateral Agent, RBS and Bank of America, N.A. as Issuing Banks, the lenders party thereto (the “ Lenders ”), and the other agents party thereto;

WHEREAS, Borrower desires to amend the Credit Agreement to clarify the treatment of deferred revenue of Borrower and its Restricted Subsidiaries thereunder, and, in connection therewith, has requested that the Required Lenders agree to the amendment to the Credit Agreement set forth herein on the terms and conditions set forth herein; and

WHEREAS, the Required Lenders are willing to agree to such amendment, on the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the promises and covenants set forth herein and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows:

Section 1.    Amendment

A new clause (k) is hereby added to the end of the definition of “Consolidated Net Income” in Section 1.01 of the Credit Agreement, reading in its entirety as follows:

(k)     Consolidated Net Income for such period shall be increased to the extent of any increase in the amount of deferred revenue for such period (as compared with the preceding period), and decreased to the extent of any decrease in the amount of deferred revenue for such period (as compared with the preceding period).

Section 2.    Effectiveness
(a) This Amendment shall become effective as of the date on which each of the following conditions precedent shall have been satisfied (the “ First Amendment Effective Date ”): (a) the Administrative Agent shall have received this Amendment, duly executed by the Borrower and the Required Lenders; (b) the representations and warranties contained in Article III of the Credit Agreement shall be true and correct in all material respects, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they shall have been true and correct in all material respects as of such earlier date; (c) as of the First Amendment Effective Date (and after giving effect to this Amendment), no Default or Event of Default shall have occurred and be continuing; and (d) the Borrower shall have paid all fees and expenses then due and payable to the Lenders and the

Administrative Agent hereunder or under any other Loan Document, including as set forth in Section 3 hereof; provided ,  however , that (i) for purposes of the Credit Agreement, as of the First Amendment Effective Date, the amendment set forth in Section 1 shall be deemed to be effective as of the last date of fiscal quarter of the Borrower that ended on March 31, 2012, and each fiscal quarter thereafter, and (ii) together with the financial statements delivered by the Borrower pursuant to Section 5.04(b) of the Credit Agreement in respect of the fiscal quarter that ended on June 30, 2012, the Borrower shall deliver to the Administrative Agent revised financial statements for the fiscal quarter that ended on March 31, 2012, revised to reflect the amendment set forth in Section 1.

(b)     Notwithstanding the foregoing, this Amendment shall not become effective and the agreements hereunder will be terminated unless each of the foregoing conditions is satisfied (or waived by Lenders comprising at least the Required Lenders in writing) on or prior to August 31, 2012.

Section 3.    Fees and Expenses

The Borrower agrees to pay on demand in accordance with the terms of Section 9.05(iii) of the Credit Agreement all reasonable and documented out-of-pocket expenses incurred by the Administrative Agent and its Affiliates in connection with the preparation of this Amendment.

Section 4.    Effect of this Amendment

(a)    This Amendment shall be construed as an amendment to the Credit Agreement and shall be administered and applied in accordance with the terms and provisions thereof.
(b)    Except as specifically amended pursuant to the terms of this Amendment, the terms and conditions of the Credit Agreement and the other Loan Documents remain in full force and effect and are hereby ratified and confirmed.
(c)    The amendment set forth herein is limited strictly to its terms, and shall not operate as a modification or waiver of any right, power or remedy of the Lenders, the Borrower, the Administrative Agent or any other Person under the Credit Agreement or any other Loan Document, nor constitute a modification or waiver of any other provision of the Credit Agreement or any other Loan Document.
(d)    Each of the Loan Documents, including the Credit Agreement, and any and all other agreements, documents or instruments now or hereafter executed or delivered pursuant to the terms hereof or pursuant to the terms of the Credit Agreement as amended hereby, are hereby amended so that any reference in such Loan Documents to the Credit Agreement, whether direct or indirect, shall mean a reference to the Credit Agreement as amended hereby.
(e)    The Borrower and each other Loan Party hereby ratifies, approves and confirms in every respect all the terms, provisions, conditions and obligations of the Credit Agreement and each of the other Loan Documents, including without limitation all Mortgages, the Collateral Agreement and other Collateral Documents, to which it is a party.
Section 5.    Representations and Warranties
The Borrower hereby represents and warrants that after giving effect hereto:
(a)    the execution, delivery and performance by the Borrower and each other Loan Party of this Amendment and the other Loan Documents have been duly authorized by all necessary corporate or other action required on their part and this Amendment, along with the Credit Agreement and other Loan

2

Documents, constitutes the legal, valid and binding obligation of each Loan Party party thereto enforceable against them in accordance with its terms, except as its enforceability may be affected by the effect of bankruptcy, insolvency, reorganization, moratorium or other similar laws now or hereafter in effect relating to or affecting the rights or remedies of creditors generally; and
(b)    neither the execution, delivery and performance of this Amendment by the Borrower and each other Loan Party, the performance by them of the Credit Agreement nor the consummation of the transactions contemplated hereby does or shall contravene, result in a breach of, or violate (i) any provision of any Loan Party’s certificate or articles of incorporation or bylaws or other similar documents, or agreements, (ii) any law or regulation, or any order or decree of any court or government instrumentality, or (iii) any indenture, mortgage, deed of trust, lease, agreement or other instrument to which any Loan Party is a party or by which any Loan Party or any of their property is bound, except in any such case to the extent such conflict or breach has been waived by a written waiver document, a copy of which has been delivered to Administrative Agent on or before the date hereof.
Section 6    Miscellaneous
(a)    THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

(b)    This Amendment may be executed in one or more counterparts, each of which shall constitute an original but all of which, when taken together, shall constitute but one contract, and shall become effective as provided in Section 2 hereof. Delivery of an executed counterpart to this Amendment by facsimile transmission or an electronic transmission of a PDF copy thereof shall be as effective as delivery of a manually signed original. Any such delivery shall be followed promptly by delivery of the manually signed original.

(c)    In the event any one or more of the provisions contained in this Amendment should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and therein shall not in any way be affected or impaired thereby. The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.

(d)    The terms of this Amendment shall be binding upon, and shall inure to the benefit of, the parties hereto and their respective successors and permitted assigns.
(e)    This Amendment is a Loan Document.
[SIGNATURE PAGES FOLLOW]

3

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered as of the date first above written.

SUMMIT MIDSTREAM HOLDINGS, LLC,
as the Borrower

By:    Summit Midstream Partners, LLC, its sole     member

By: /s/ Matt Harrison
Name: Matt Harrison
Title:    Senior Vice President, CFO

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

THE ROYAL BANK OF SCOTLAND PLC,
as the Administrative Agent and as a Lender

By:  /s/ Stuart Gibson
Name: Stuart Gibson
Title: Authorised Signatory

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

BANK OF AMERICA, N.A.,
as a Lender

By: /s/ Adam H. Fey
Name: Adam H. Fey
Title: Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

AMEGY BANK NATIONAL ASSOCIATION,
as a Lender

By: /s/ Jill McSorley
Name: Jill McSorley
Title: Senior Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

BARCLAYS BANK PLC,
as a Lender

By: /s/ Sreedhar R. Kona
Name: Sreedhar R. Kona
Title: Assistant Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

BMO HARRIS FINANCING, INC.,
as a Lender

By: /s/ Kevin Utsey
Name: Kevin Utsey
Title: Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

CAPITAL ONE, NATIONAL ASSOCIATION,
as a Lender

By: /s/ Matthew Molero
Name: Matthew Molero
Title: Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

COMERICA BANK,
as a Lender

By: /s/ John S. Lesikar
Name: John S. Lesikar
Title: Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

COMPASS BANK,
as a Lender

By: /s/ Ian Payne
Name: Ian Payne
Title: Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

CREDIT AGRICOLE CORPORATE AND INVESTMENT BANK,
as a Lender

By: /s/ Gayer D. Bellamy Jr.
Name: Gayer D. Bellamy Jr.
Title: Managing Director

By: /s/ George Councill
Name: George Councill
Title: Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

DEUTSCHE BANK TRUST COMPANY AMERICAS,
as a Lender

By: /s/ Michael Getz
Name: Michael Getz
Title: Vice President

By: /s/ Dusan Lazarov
Name: Dusan Lazarov
Title: Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

GOLDMAN SACHS BANK USA,
as a Lender

By: /s/ Michelle Latzoni
Name: Michelle Latzoni
Title: Authorized Signatory

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

ING CAPITAL LLC,
as a Lender

By: /s/ Cheryl Labelle
Name: Cheryl Labelle
Title: Managing Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

MIDFIRST BANK,
as a Lender

By: /s/ Chad Dayton
Name: Chad Dayton
Title: Assistant Vice President

By: /s/ James P. Boggs
Name: James P. Boggs
Title: Senior Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

MORGAN STANLEY BANK, N.A.,
as a Lender

By: /s/ William Jones
Name: William Jones
Title: Authorized Signatory

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

REGIONS BANK,
as a Lender

By: /s/ Kelly L. Elmore III
Name: Kelly L. Elmore III
Title: Senior Vice President

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

ROYAL BANK OF CANADA,
as a Lender

By: /s/ Jason S. York
Name: Jason S. York
Title: Authorized Signatory

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

SUMITOMO MITSUI BANKING CORPORATION,
as a Lender

By: /s/ Kazuhisa Matsuda
Name: Kazuhisa Matsuda
Title: Managing Director

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

ACKNOWLEDGED AND AGREED AS OF THE DATE FIRST ABOVE WRITTEN:

DFW MIDSTREAM SERVICES LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By:  /s/ Matt Harrison
    Name:    Matt Harrison
    Title:    Senior Vice President, CFO

SUMMIT MIDSTREAM PARTNERS, LLC

By:  /s/ Matt Harrison
    Name:    Matt Harrison
    Title:    Senior Vice President, CFO

DFW MIDSTREAM MANAGEMENT, LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By:  /s/ Matt Harrison
    Name:    Matt Harrison
    Title:    Senior Vice President, CFO

GRAND RIVER GATHERING, LLC

By:  /s/ Matt Harrison
    Name:    Matt Harrison
    Title:    Senior Vice President, CFO

[Signature Page to First Amendment to Amended and Restated Credit Agreement]

EXHIBIT 10.2

SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT
This SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT, dated as of November 1, 2012 (this “ Amendment ”), is entered into by and between Summit Midstream Holdings, LLC (the “ Borrower ”), and The Royal Bank of Scotland plc (“ RBS ”), as the Administrative Agent (the “ Administrative Agent ”). Capitalized terms used herein and not otherwise defined herein shall have the meanings given to them in the Credit Agreement (as defined below).
RECITALS

WHEREAS, the parties hereto are parties to that certain Amended and Restated Credit Agreement, dated as of May 7, 2012 (as amended by that certain First Amendment to Amended and Restated Credit Agreement dated as of August 3, 2012, and as the same may from time to time be amended, amended and restated, supplemented or otherwise modified, the “ Credit Agreement ”), by and among the Borrower, the Administrative Agent, RBS, as the Collateral Agent, RBS and Bank of America, N.A. as Issuing Banks, the lenders party thereto (the “ Lenders ”), and the other agents party thereto;
WHEREAS, pursuant to Section 9.08(d) of the Credit Agreement, Borrower and the Administrative Agent may amend the Credit Agreement without Lender consent in order to cure an ambiguity, omission, mistake or defect; and
WHEREAS, in connection with the consummation of the MLP Conversion, Borrower and the Administrative Agent desire to amend the Credit Agreement on the terms and conditions set forth herein to cure certain defects.
NOW, THEREFORE, in consideration of the promises and covenants set forth herein and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows:
Section 1.    Amendment

(a)    Section 1.01 of the Credit Agreement is hereby amended by adding the following defined term in the appropriate alphabetical order therein:
“MLP Entity” means Summit Midstream Partners, LP, a Delaware limited partnership.
(b)    The proviso in the definition of “Change of Control” set forth in Section 1.01 of the Credit Agreement is hereby amended and restated in its entirety to read as follows:
“provided, that, at any time after any MLP Conversion has occurred (and so long as the resulting Master Limited Partnership shall continue to exist), the term “Change in Control” shall mean the occurrence of clauses (b), (c) or (d) above or any of the following: (i) a majority of the seats (other than vacant seats) on the board of directors of Summit Midstream GP, LLC shall at any time be

occupied by Persons who were not appointed by the Sponsor or a Permitted Holder, (ii) any Person or group (within the meaning of Rule 13d-5 of the Exchange Act as in effect on the Restatement Date), other than any combination of the Permitted Holders (or a single Permitted Holder), shall own beneficially (within the meaning of Rule 13d-5 of the Exchange Act as in effect on the Restatement Date), directly or indirectly, in the aggregate Equity Interests representing 35% or more of the aggregate ordinary voting power represented by the issued and outstanding Equity Interests of the Borrower and any combination of the Permitted Holders (including a single Permitted Holder) own beneficially (as defined above), directly or indirectly, a smaller percentage of such ordinary voting power at such time than the Equity Interests owned by such other Person or group, (iii) the Permitted Holders shall fail to own beneficially (within the meaning of Rule 13d-5 of the Exchange Act as in effect on the Restatement Date), directly or indirectly, in the aggregate Equity Interests representing more than 50% of (A) the aggregate ordinary voting power represented by the issued and outstanding Equity Interests of the Summit Midstream GP, LLC or (B) the economic interest represented by the issued and outstanding Equity Interests of Summit Midstream GP, LLC, or (iv) (1) the Permitted Holders shall cease to directly or indirectly own and control, of record and beneficially more than 50% of the issued and outstanding general partner interests in Summit Midstream GP, LLC, or (2) Summit Midstream GP, LLC shall cease to be the General Partner.”
(c)    The definition of “General Partner” set forth in Section 1.01 of the Credit Agreement is hereby amended by deleting the word “Borrower” therein, and replacing it with the words “MLP Entity”.
(d)    Section 5.04(a) of the Credit Agreement is hereby amended and restated in its entirety to read as follows:
“(a)    within 120 days after the end of each fiscal year, (i) a consolidated balance sheet and related statements of operations, cash flows and owners’ equity showing the financial position of the MLP Entity (which shall include the financial positions of the Borrower and its Restricted Subsidiaries) as of the close of such fiscal year and the consolidated results of their operations during such year and setting forth in comparative form the corresponding figures for the prior fiscal year, all audited by independent accountants of recognized national standing reasonably acceptable to the Administrative Agent and accompanied by an opinion of such accountants (which shall not be qualified in any material respect) to the effect that such consolidated financial statements fairly present, in all material respects, the financial position and results of operations of the MLP Entity, the Borrower and its Restricted Subsidiaries on a consolidated basis in accordance with GAAP, or (ii) at all times after the MLP Conversion has occurred (and so long as the resulting Master Limited Partnership shall continue to exist), the MLP Entity’s Form 10-K in respect of such fiscal year, as filed with the SEC;”

2

(e)    Section 5.04(b) of the Credit Agreement is hereby amended and restated in its entirety to read as follows:
“(b)    within 60 days after the end of each of the first three fiscal quarters of each fiscal year, (ii) an unaudited consolidated balance sheet and related statements of operations and cash flows showing the financial position of the MLP Entity (which shall include the financial positions of the Borrower and its Restricted Subsidiaries) as of the close of such fiscal quarter and the consolidated results of their operations during such fiscal quarter and the then-elapsed portion of the fiscal year and setting forth in comparative form the corresponding figures for the corresponding periods of the prior fiscal year, all certified by a Financial Officer, on behalf of the MLP Entity, to the best of the MLP Entity’s knowledge, as fairly presenting, in all material respects, the financial position and results of operations of the MLP Entity, the Borrower and its Restricted Subsidiaries on a consolidated basis in accordance with GAAP (subject to normal year-end audit adjustments and the absence of footnotes), or (ii) at all times after the MLP Conversion has occurred (and so long as the resulting Master Limited Partnership shall continue to exist), the MLP Entity’s Form 10-Q in respect of such fiscal quarter, as filed with the SEC;”
(f)    Section 5.12 of the Credit Agreement is hereby amended and restated in its entirety to read as follows:
“Section 5.12    Post-Closing Conditions. The Borrower shall deliver to the Administrative Agent within 270 days after the Restatement Date (i) either (A) a consent of the fee owner of the Real Property underlying the Gathering Station identified on Schedule 1.01 to GRG’s encumbering of such Real Property with a Mortgage or (B) evidence of the acquisition of a fee interest in such Real Property by Encana Oil & Gas (USA) Inc., and (ii) a Mortgage or amendment to Mortgage granting to the Collateral Agent a first priority Lien in such Real Property, subject only to Permitted Real Property Liens.”
Section 2.    Effectiveness
This Amendment shall become effective as of the date on which each of the following conditions precedent shall have been satisfied (the “ Second Amendment Effective Date ”): (a) the Administrative Agent shall have received this Amendment, duly executed by the Borrower, and (b) the Borrower shall have paid all fees and expenses then due and payable to the Lenders and the Administrative Agent hereunder or under any other Loan Document, including as set forth in Section 3 hereof.
Section 3.    Fees and Expenses

The Borrower agrees to pay on demand in accordance with the terms of Section 9.05(iii) of the Credit Agreement all reasonable and documented out-of-pocket expenses incurred by the Administrative Agent and its Affiliates in connection with the preparation of this Amendment.

3

Section 4.    Effect of this Amendment

(a)    This Amendment shall be construed as an amendment to the Credit Agreement and shall be administered and applied in accordance with the terms and provisions thereof.
(b)    Except as specifically amended pursuant to the terms of this Amendment, the terms and conditions of the Credit Agreement and the other Loan Documents remain in full force and effect and are hereby ratified and confirmed.
(c)    The amendment set forth herein is limited strictly to its terms, and shall not operate as a modification or waiver of any right, power or remedy of the Lenders, the Borrower, the Administrative Agent or any other Person under the Credit Agreement or any other Loan Document, nor constitute a modification or waiver of any other provision of the Credit Agreement or any other Loan Document.
(d)    Each of the Loan Documents, including the Credit Agreement, and any and all other agreements, documents or instruments now or hereafter executed or delivered pursuant to the terms hereof or pursuant to the terms of the Credit Agreement as amended hereby, are hereby amended so that any reference in such Loan Documents to the Credit Agreement, whether direct or indirect, shall mean a reference to the Credit Agreement as amended hereby.
Section 5.    Representations and Warranties
The Borrower hereby represents and warrants that, as of the Second Amendment Effective Date (and after giving effect to this Amendment): (a) the representations and warranties contained in Article III of the Credit Agreement shall be true and correct in all material respects, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they shall have been true and correct in all material respects as of such earlier date, and (b) no Default or Event of Default shall have occurred and be continuing.
Section 6    Miscellaneous
(a)    THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.
(b)    This Amendment may be executed in one or more counterparts, each of which shall constitute an original but all of which, when taken together, shall constitute but one contract, and shall become effective as provided in Section 2 hereof. Delivery of an executed counterpart to this Amendment by facsimile transmission or an electronic transmission of a PDF copy thereof shall be as effective as delivery of a manually signed original. Any such delivery shall be followed promptly by delivery of the manually signed original.
(c)    In the event any one or more of the provisions contained in this Amendment should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and therein shall not in any way be affected or impaired thereby. The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.

4

(d)    The terms of this Amendment shall be binding upon, and shall inure to the benefit of, the parties hereto and their respective successors and permitted assigns.
(e)    This Amendment is a Loan Document.
[SIGNATURE PAGES FOLLOW]

5

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered as of the date first above written.

SUMMIT MIDSTREAM HOLDINGS, LLC,
as the Borrower

By:    Summit Midstream Partners, LLC, its sole     member

By: /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO

S-1
[Signature Page to Second Amendment to Amended and Restated Credit Agreement]

THE ROYAL BANK OF SCOTLAND PLC,
as the Administrative Agent

By: /s/ Stuart Gibson
Name: Stuart Gibson
Title: Authorised Signatory

S-2
[Signature Page to Second Amendment to Amended and Restated Credit Agreement]

ACKNOWLEDGED AND AGREED AS OF THE DATE FIRST ABOVE WRITTEN:

DFW MIDSTREAM SERVICES LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By:  /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO

SUMMIT MIDSTREAM PARTNERS, LLC

By:  /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO

DFW MIDSTREAM MANAGEMENT, LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By: /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO

GRAND RIVER GATHERING, LLC

By: /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO
SUMMIT MIDSTREAM PARTNERS, LP

By:    Summit Midstream GP, LLC,
    its General Partner

By:  /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President, CFO

S-3
[Signature Page to Second Amendment to Amended and Restated Credit Agreement]

EXHIBIT 10.3

THIRD AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT
This THIRD AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT, dated as of January 31, 2013 (this “ Amendment ”), is entered into by and among Summit Midstream Holdings, LLC (the “ Borrower ”), The Royal Bank of Scotland plc (“ RBS ”), as the Administrative Agent (the “ Administrative Agent ”), and the Required Lenders party hereto. Capitalized terms used herein and not otherwise defined herein shall have the meanings given to them in the Credit Agreement (as defined below).
RECITALS

WHEREAS, the parties hereto are parties to that certain Amended and Restated Credit Agreement, dated as of May 7, 2012 (as amended by that certain First Amendment to Amended and Restated Credit Agreement dated as of August 3, 2012, and by that certain Second Amendment to Amended and Restated Credit Agreement dated as of November 1, 2012, and as the same may from time to time be further amended, amended and restated, supplemented or otherwise modified, the “ Credit Agreement ”), by and among the Borrower, the Administrative Agent, RBS, as the Collateral Agent, RBS and Bank of America, N.A. as Issuing Banks, the lenders party thereto (the “ Lenders ”), and the other agents party thereto;
WHEREAS, the Borrower desires to amend the Credit Agreement to extend the post-closing due date for certain documents relating to the encumbrance of Real Property more particularly described therein, required to be delivered pursuant to Section 5.12 of the Credit Agreement, and, in connection therewith, has requested that the Required Lenders agree to the amendment to the Credit Agreement set forth herein on the terms and conditions set forth herein; and
WHEREAS, the Required Lenders are willing to agree to such amendment, on the terms and conditions set forth herein.
NOW, THEREFORE, in consideration of the promises and covenants set forth herein and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows:
Section 1.    Amendment

Section 5.12 of the Credit Agreement is hereby amended and restated in its entirety to read as follows:
“Section 5.12    Post-Closing Conditions. The Borrower shall deliver to the Administrative Agent, on or before July 31, 2013, (i) either (A) a consent of the fee owner of the Real Property underlying the Gathering Station identified on Schedule 1.01, to GRG’s encumbering of such Real Property with a Mortgage, or (B) evidence of the acquisition of a fee interest in such Real Property by Encana Oil & Gas (USA) Inc., and (ii) a Mortgage or amendment to Mortgage granting to the Collateral Agent a first priority Lien in such Real Property, subject only to Permitted Real Property Liens.”

Section 2.    Effectiveness
This Amendment shall become effective as of the date on which each of the following conditions precedent shall have been satisfied (the “ Third Amendment Effective Date ”): (a) the Administrative Agent shall have received this Amendment, duly executed by the Borrower and the Required Lenders, (b) as of the Third Amendment Effective Date (and after giving effect to this Amendment), no Default or Event of Default shall have occurred and be continuing, and (c) the Borrower shall have paid all fees and expenses then due and payable to the Lenders and the Administrative Agent hereunder or under any other Loan Document, including as set forth in Section 3 hereof.
Section 3.    Fees and Expenses

The Borrower agrees to pay on demand in accordance with the terms of Section 9.05(iii) of the Credit Agreement all reasonable and documented out-of-pocket expenses incurred by the Administrative Agent and its Affiliates in connection with the preparation of this Amendment.
Section 4.    Effect of this Amendment

(a)    This Amendment shall be construed as an amendment to the Credit Agreement and shall be administered and applied in accordance with the terms and provisions thereof.
(b)    Except as specifically amended pursuant to the terms of this Amendment, the terms and conditions of the Credit Agreement and the other Loan Documents remain in full force and effect and are hereby ratified and confirmed.
(c)    The amendment set forth herein is limited strictly to its terms, and shall not operate as a modification or waiver of any right, power or remedy of the Lenders, the Borrower, the Administrative Agent or any other Person under the Credit Agreement or any other Loan Document, nor constitute a modification or waiver of any other provision of the Credit Agreement or any other Loan Document.
(d)    Each of the Loan Documents, including the Credit Agreement, and any and all other agreements, documents or instruments now or hereafter executed or delivered pursuant to the terms hereof or pursuant to the terms of the Credit Agreement as amended hereby, are hereby amended so that any reference in such Loan Documents to the Credit Agreement, whether direct or indirect, shall mean a reference to the Credit Agreement as amended hereby.
Section 5.    Representations and Warranties
The Borrower hereby represents and warrants that, as of the Third Amendment Effective Date (and after giving effect to this Amendment): (a) the representations and warranties contained in Article III of the Credit Agreement shall be true and correct in all material respects, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they shall have been true and correct in all material respects as of such earlier date, and (b) no Default or Event of Default shall have occurred and be continuing.

2

Section 6.    Miscellaneous
(a)    THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.
(b)     This Amendment may be executed in one or more counterparts, each of which shall constitute an original but all of which, when taken together, shall constitute but one contract, and shall become effective as provided in Section 2 hereof. Delivery of an executed counterpart to this Amendment by facsimile transmission or an electronic transmission of a PDF copy thereof shall be as effective as delivery of a manually signed original. Any such delivery shall be followed promptly by delivery of the manually signed original.
(c)     In the event any one or more of the provisions contained in this Amendment should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and therein shall not in any way be affected or impaired thereby. The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.
(d)     The terms of this Amendment shall be binding upon, and shall inure to the benefit of, the parties hereto and their respective successors and permitted assigns.
(e) This Amendment is a Loan Document.
[SIGNATURE PAGES FOLLOW]

3

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered as of the date first written above.

SUMMIT MIDSTREAM HOLDINGS, LLC,
as the Borrower

By:    Summit Midstream Partners, LLC, its sole     member

By: /s/ Matt Harrison
Name: Matt Harrison
Title: Senior Vice President - CFO    

S-1
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

THE ROYAL BANK OF SCOTLAND PLC,
as the Administrative Agent, Collateral Agent,     as an Issuing Bank and as a Lender

By: /s/ Sanjay Remond
Name: Sanjay Remond
Title: Authorised Signatory

S-2
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

BANK OF AMERICA, N.A.,
as an Issuing Bank and as a Lender

By: /s/ Michael J. Clayborne
Name: Michael J. Clayborne
Title: Vice President

S-3
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

AMEGY BANK, NATIONAL ASSOCIATION,
as a Lender

By: /s/ Jill McSorley
Name: Jill McSorley
Title: Senior Vice President

S-4
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

BARCLAYS BANK PLC,
as a Lender

By: /s/ Sreedhar R. Kona
Name: Sreedhar R. Kona
Title: Assistant Vice President

S-5
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

BMO HARRIS FINANCING, INC.,
as a Lender

By: /s/ Kevin Utsey
Name: Kevin Utsey
Title: Director

S-6
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

CAPITAL ONE, NATIONAL ASSOCIATION,
as a Lender

By: /s/ Matthew Molero
Name: Matthew Molero
Title: Vice President

 

S-7
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

COMERICA BANK,
as a Lender

By: /s/ John S. Lesikar
Name: John S. Lesikar
Title: Vice President

S-8
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

COMPASS BANK,
as a Lender

By: /s/ Ian Payne
Name: Ian Payne
Title: Vice President

S-9
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

CREDIT AGRICOLE CORPORATE AND INVESTMENT BANK,
as a Lender

By: /s/ Gayer D. Bellamy Jr.
Name: Gayer D. Bellamy Jr.
Title: Managing Director

By: /s/ Deborah Kross
Name: Deborah Kross
Title: Director

S-10
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

DEUTSCHE BANK TRUST COMPANY AMERICAS,
as a Lender

By: /s/ Kevin Chichester
Name: Kevin Chichester
Title: Director

By: /s/ Calli S. Hayes
Name: Calli S. Hayes
Title: Managing Director

S-11
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

GOLDMAN SACHS BANK USA,
as a Lender

By: /s/ Michelle Latzoni
Name: Michelle Latzoni
Title: Authorized Signatory

S-12
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

ING CAPITAL LLC,
as a Lender

By: /s/ Cheryl Labelle
Name: Cheryl Labelle
Title: Managing Director

 

S-13
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

MIDFIRST BANK,
as a Lender

By: /s/ Chad Dayton
Name: Chad Dayton
Title: Assistant Vice President

By: /s/ James P. Boggs
Name: James P. Boggs
Title: Senior Vice President

S-14
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

MORGAN STANLEY BANK, N.A.,
as a Lender

By: /s/ William Jones
Name: William Jones
Title: Authorized Signatory

S-15
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

REGIONS BANK,
as a Lender

By: /s/ David Valentine
Name: David Valentine
Title: Vice President

S-16
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

ROYAL BANK OF CANADA,
as a Lender

By: /s/ Jason S. York
Name: Jason S. York
Title: Authorized Signatory

S-17
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

SUMITOMO MITSUI BANKING CORPORATION,
as a Lender

By: /s/ Shuji Yabe
Name: Shuji Yabe
Title: Managing Director

S-18
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

ACKNOWLEDGED AND AGREED AS OF THE DATE FIRST ABOVE WRITTEN:

DFW MIDSTREAM SERVICES LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By:  /s/ Matt Harrison
    Name: Matt Harrison    
    Title: Senior Vice President - CFO    

SUMMIT MIDSTREAM PARTNERS, LLC

By:  /s/ Matt Harrison
    Name: Matt Harrison    
    Title: Senior Vice President - CFO

DFW MIDSTREAM MANAGEMENT, LLC

By:    Summit Midstream Partners, LLC,
    its Managing Member

By:  /s/ Matt Harrison
    Name: Matt Harrison    
    Title: Senior Vice President - CFO

GRAND RIVER GATHERING, LLC

By:  /s/ Matt Harrison
    Name: Matt Harrison    
    Title: Senior Vice President - CFO
SUMMIT MIDSTREAM PARTNERS, LP

By:    Summit Midstream GP, LLC,
    its General Partner

By: /s/ Matt Harrison
    Name: Matt Harrison    
    Title: Senior Vice President - CFO

S-19
[Signature Page to Third Amendment to Amended and Restated Credit Agreement]

EXHIBIT 31.1

CERTIFICATIONS
I, Steven J. Newby, certify that:
1. I have reviewed this quarterly report on Form 10-Q of Summit Midstream Partners, LP;
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) 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) Paragraph omitted pursuant to Rule 13a-14(a) of the General Rules and Regulations promulgated under the Securities Exchange Act of 1934;
(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and
5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):
(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and
(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	May 14, 2013	 	/s/ Steven J. Newby	
 	 	 	Steven J. Newby	
 	 	 	President, Chief Executive Officer and Director of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)	

EXH 31.1-1

EXHIBIT 31.2

CERTIFICATIONS
I, Matthew S. Harrison, certify that:
1.I have reviewed this quarterly report on Form 10-Q of Summit Midstream Partners, LP;
2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) 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) Paragraph omitted pursuant to Rule 13a-14(a) of the General Rules and Regulations promulgated under the Securities Exchange Act of 1934;
(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
 	 	
5.	The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):	
(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

 	 	 	 	
Date:	May 14, 2013	 	/s/ Matthew S. Harrison	
 	 	 	Matthew S. Harrison	
 	 	 	Senior Vice President and Chief Financial Officer of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)	

EXH 31.2-1

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 on Form 10-Q of Summit Midstream Partners, LP (the “Registrant”) for the quarterly period ended March 31, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Steven J. Newby, as President, Chief Executive Officer and Director of Summit Midstream GP, LLC, the general partner of the Registrant, and Matthew S. Harrison, as Senior Vice President and Chief Financial Officer of Summit Midstream GP, LLC, the general partner of the Registrant, each hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

(1)	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and	

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

 	 	 	 	 	
 	 	 	 	 	
/s/ Steven J. Newby	
Name:	 	Steven J. Newby	
Title:	 	President, Chief Executive Officer and Director of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)	
Date:	 	May 14, 2013	

/s/ Matthew S. Harrison	
Name:	 	Matthew S. Harrison	
Title:	 	Senior Vice President and Chief Financial Officer of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)	
Date:	 	May 14, 2013	

EXH 32.1-1