10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

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

For the fiscal year ended December 31, 2023

or

o 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)

910 Louisiana Street, Suite 4200

Houston, TX

(Address of principal executive offices)

45-5200503

(I.R.S. Employer

Identification No.)

77002

(Zip Code)

(832) 413-4770

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Units	SMLP	New York Stock Exchange

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

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

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

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 every Interactive Data File required to be submitted 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 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, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	o	Accelerated filer	x
Non-accelerated filer	o	Smaller reporting company	x
Emerging growth company	o

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

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to § 240.10D-1(b). o

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

The aggregate market value of the common units held by non-affiliates of the registrant as of June 30, 2023 was 168,613,071.

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 March 1, 2024
Common Units	10,415,675

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement relating to its 2024 Annual Meeting of Limited Partners, which will be filed with the Securities and Exchange Commission within 120 days of December 31, 2023, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

Table of Contents

TABLE OF CONTENTS

PART I		15
Item 1.	Business.	15
Item 1A.	Risk Factors.	32
Item 1B.	Unresolved Staff Comments.	64
Item 1C.	Cybersecurity Risk Management, Strategy, and Governance	64
Item 2.	Properties.	65
Item 3.	Legal Proceedings.	65
Item 4.	Mine Safety Disclosures.	66
PART II		67
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.	67
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations.	70
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk.	95
Item 8.	Financial Statements and Supplementary Data.	96
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.	131
Item 9A.	Controls and Procedures.	131
Item 9B.	Other Information.	133
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.	134
Part III		135
Item 10.	Directors, Executive Officers and Corporate Governance.	135
Item 11.	Executive Compensation.	135
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.	135
Item 13.	Certain Relationships and Related Transactions, and Director Independence.	135
Item 14.	Principal Accounting Fees and Services.	135
Part IV		136
Item 15.	Exhibits, Financial Statement Schedules.	136
Item 16.	Form 10-K Summary.	142
Signature Page		143

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Investors are cautioned that certain statements contained in this report as well as in periodic press releases and certain oral statements made by our officers and employees 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 various risks and uncertainties, including, but not limited to, those described in Item 1A. Risk Factors included in this Annual Report on Form 10-K (this “Annual Report”).

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 the cautionary statements in this paragraph. These risks and uncertainties include, among others:

•our decision whether to pay, or our ability to grow, our cash distributions;

•fluctuations in natural gas, NGLs and crude oil prices, including as a result of political or economic measures taken by various countries or OPEC;

•the extent and success of our customers' drilling and completion efforts, as well as the quantity of natural gas, crude oil, fresh water deliveries, and produced water volumes produced within proximity of our assets;

•failure or delays by our customers in achieving expected production in their natural gas, crude oil and produced water projects;

•competitive conditions in our industry and their impact on our ability to connect hydrocarbon supplies to our gathering and processing assets or systems;

•actions or inactions taken or nonperformance by third parties, including suppliers, contractors, operators, processors, transporters and customers, including the inability or failure of our shipper customers to meet their financial obligations under our gathering agreements and our ability to enforce the terms and conditions of certain of our gathering agreements in the event of a bankruptcy of one or more of our customers;

•our ability to divest of certain of our assets to third parties on attractive terms, which is subject to a number of factors, including prevailing conditions and outlook in the natural gas, NGL and crude oil industries and markets;

•the ability to attract and retain key management personnel;

•commercial bank and capital market conditions and the potential impact of changes or disruptions in the credit and/or capital markets;

•changes in the availability and cost of capital and the results of our financing efforts, including availability of funds in the credit and/or capital markets;

•restrictions placed on us by the agreements governing our debt and preferred equity instruments;

•the availability, terms and cost of downstream transportation and processing services;

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

•the current and potential future impact of the COVID-19 pandemic or other pandemics on our business, results of operations, financial position or cash flows;

•operational risks and hazards inherent in the gathering, compression, treating and/or processing of natural gas, crude oil and produced water;

•our ability to comply with the terms of the agreements comprising the Global Settlement;

•weather conditions and terrain in certain areas in which we operate;

•physical and financial risks associated with climate change;

•any other issues that can result in deficiencies in the design, installation or operation of our gathering, compression, treating, processing and freshwater facilities;

•timely receipt of necessary government approvals and permits, our ability to control the costs of construction, including costs of materials, labor and rights-of-way and other factors that may impact our ability to complete projects within budget and on schedule;

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•our ability to finance our obligations related to capital expenditures, including through opportunistic asset divestitures or joint ventures and the impact any such divestitures or joint ventures could have on our results;

•the effects of existing and future laws and governmental regulations, including environmental, safety and climate change requirements and federal, state and local restrictions or requirements applicable to oil and/or gas drilling, production or transportation;

•changes in tax status;

•the effects of litigation;

•interest rates;

•changes in general economic conditions;

•our ability to effect a transaction pursuant to our strategic review; 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, preferred units and senior notes.

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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Risk Factors Summary

This summary briefly lists the principal risks and uncertainties facing our business, which are only a select portion of those risks. A more complete discussion of those risks and uncertainties is set forth in Part I, Item 1A of this Annual Report. Additional risks not presently known to us or that we currently deem immaterial may also affect us. If any of these risks occur, our business, financial condition or results of operations could be materially and adversely affected.

Our business is subject to the following principal risks and uncertainties:

Risks Related to Our Operations

•We are engaged in a strategic review process, which may pose additional risks to our business, and there can be no assurance as to its outcome.

•We may not have sufficient cash from operations following the establishment of cash reserves and payment of fees and expenses to enable us to pay distributions to holders of our preferred units and common units.

•We depend on a relatively small number of customers for a significant portion of our revenues.

•We are exposed to the creditworthiness and performance of our customers, suppliers and contract counterparties and any material nonpayment or nonperformance by one or more of these parties could materially adversely affect our financial and operating results.

•Significant prolonged weakness in natural gas, NGL and crude oil prices could reduce throughput on our systems and materially adversely affect our revenues and results of operations.

•Because of the natural decline in production from our customers' existing wells, our success depends in part on our customers replacing declining production and also on our ability to maintain levels of throughput on our systems.

•We may not be able to renew or replace expiring contracts at favorable rates or on a long-term basis.

•Our ability to operate our business effectively could be impaired if we fail to attract and retain key personnel.

•A transition from hydrocarbon energy sources to alternative energy sources could lead to changes in demand, technology and public sentiment which could have material adverse effects on our business and results of operations.

Risks Related to Our Finances

•Limited access to and/or availability of the commercial bank market or debt and equity capital markets could impair our ability to grow or cause us to be unable to meet future capital requirements.

•Our leverage and debt service obligations may adversely affect our financial condition, results of operations and business prospects, and may limit our flexibility to obtain financing and to pursue other business opportunities.

•We may not be able to generate sufficient cash to service all of our indebtedness and may be forced to take other actions to satisfy our obligations under our indebtedness or to refinance, which may not be successful.

•Restrictions in our debt instruments could materially adversely affect our business, financial condition, results of operations, our ability to make cash distributions to unitholders and the value of our common units.

•Inflation could have adverse effects on our results of operation.

•An increase in interest rates will cause our debt service obligations to increase.

•A downgrade of our credit rating could impact our liquidity, access to capital and our costs of doing business, and independent third parties determine our credit ratings outside of our control.

•We have in the past and may in the future incur losses due to an impairment in the carrying value of our long-lived assets or equity method investments.

Regulatory and Environmental Policy Risks

•A change in laws and regulations applicable to our assets or services, or the interpretation or implementation of existing laws and regulations may cause our revenues to decline or our operation and maintenance expenses to increase.

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•Increased regulation of hydraulic fracturing could result in reductions or delays in customer production, which could materially adversely impact our revenues.

•We are subject to FERC jurisdiction, federal anti-market manipulation laws and regulations, potentially other federal regulatory requirements and state and local regulation, and could be materially affected by changes in such laws and regulations, or in the way they are interpreted and enforced.

•We are subject to stringent environmental laws and regulations that may expose us to significant costs and liabilities.

•Climate change legislation, regulatory initiatives and litigation could result in increased operating costs and reduced demand for the services we provide.

•We may face opposition to the development, permitting, construction or operation of our pipelines and facilities from various groups.

•Our business is subject to complex and evolving U.S. and international laws and regulations regarding privacy and data protection.

Risks Inherent in an Investment in Us

•Our Partnership Agreement replaces our General Partner’s fiduciary duties to unitholders and those of our officers and directors with contractual standards governing their duties.

•We may issue additional units without unitholder approval, which would dilute existing ownership interests.

Tax Risks

•If the IRS were to treat us as a corporation for federal income tax purposes, which would subject us to entity-level taxation, then our cash available for distribution to our unitholders would be substantially reduced.

•If we were subjected to a material amount of additional entity-level taxation by individual states, it would reduce our cash available for distribution to our unitholders.

•Our unitholders are required to pay income taxes on their share of our taxable income, which may be substantial even if they do not receive any cash distributions from us.

•In 2020, we engaged in transactions that generated substantial cancellation of debt (“COD”) income on a per unit basis relative to the trading price of our common units. We may engage in other transactions that result in substantial COD income or other substantial gains, such as gains upon asset sales, in the future, and such events may cause a unitholder to be allocated substantial income with respect to our units with no corresponding distribution of cash to fund the payment of the resulting tax liability to the unitholder.

Risks Related to Terrorism and Cyberterrorism

•Terrorist attacks and threats, escalation of military activity in response to these attacks or acts of war could have a material adverse effect on our business, financial condition or results of operations.

•Our operations depend on the use of information technology and operational technology systems that could be the target of a cyberattack.

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ORGANIZATIONAL CHART

The following chart provides a summarized view of our legal entity structure at December 31, 2023:

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COMMONLY USED OR DEFINED TERMS

2015 Blacktail Release	a 2015 rupture of our four-inch produced water gathering pipeline near Williston, North Dakota
2022 DJ Acquisitions	the acquisition of Outrigger DJ Midstream LLC from Outrigger Energy II LLC, and each of Sterling Energy Investments LLC, Grasslands Energy Marketing LLC and Centennial Water Pipelines LLC from Sterling Investment Holdings LLC
2023 Exchange Transactions	the exchange of new 2026 Unsecured Notes for outstanding 2025 Senior Notes and cash in November 2023 and the subsequent repurchases of outstanding 2025 Senior Notes
2025 Senior Notes	Summit Holdings' and Finance Corp.’s 5.75% senior unsecured notes due April 2025
2026 Secured Notes	Summit Holdings' and Finance Corp.’s 8.500% senior secured second lien notes due October 2026
2026 Secured Notes Indenture	Indenture, dated as of November 2, 2021, by and among Summit Holdings, Finance Corp., the guarantors party thereto and Regions Bank, as trustee
2026 Unsecured Notes	Summit Holdings' and Finance Corp.’s 12.00% senior unsecured notes due October 2026
2026 Unsecured Notes Indenture	Indenture, dated as of November 21, 2023, by and among Summit Holdings, Finance Corp., the guarantors party thereto and Regions Bank, as trustee
ABL Facility	the asset-based lending credit facility governed by the ABL Agreement
ABL Agreement	Loan and Security Agreement, dated as of November 2, 2021, among Summit Holdings, as borrower, SMLP and certain subsidiaries from time to time party thereto, as guarantors, Bank of America, N.A., as agent, ING Capital LLC, Royal Bank of Canada and Regions Bank, as co-syndication agents, and Bank of America, N.A., ING Capital LLC, RBC Capital Markets and Regions Capital Markets, as joint lead arrangers and joint bookrunners, as amended
Additional 2026 Secured Notes	the additional $85.0 million of 2026 Secured Notes issued in November 2022 in connection with the 2022 DJ Acquisitions
AMI	area of mutual interest; AMIs require that any production from wells drilled by our customers within the AMI be shipped on and/or processed by our gathering systems
associated natural gas	a form of natural gas which is found with deposits of petroleum, either dissolved in the crude oil or as a free gas cap above the crude oil in the reservoir
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
Audit Committee	the audit committee of the Board of Directors
Bbl	one barrel; used for crude oil and produced water and equivalent to 42 U.S. gallons
Bcf	one billion cubic feet

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Bcfe/d	the equivalent of one billion cubic feet per day; generally calculated when liquids are converted into natural gas; determined using a ratio of six thousand cubic feet of natural gas to one barrel of liquids
Bison Midstream	Bison Midstream, LLC
Board of Directors	the board of directors of our General Partner
CAA	Clean Air Act
CEA	Commodity Exchange Act
CERCLA	Comprehensive Environmental Response, Compensation and Liability Act
CFTC	Commodity Futures Trading Commission
COD	cancellation of debt
Collateral Agreement	Collateral Agreement, dated as of November 2, 2021, by and among SMLP, as a pledgor, Summit Holdings and Finance Corp., as pledgors and grantors, the subsidiary guarantors party therein, and Regions Bank, as collateral agent
Compensation Committee	the compensation committee of the Board of Directors
condensate	a natural gas liquid with a low vapor pressure, mainly composed of propane, butane, pentane and heavier hydrocarbon fractions
Conflicts Committee	the conflicts committee of the Board of Directors, if established
Co-Issuers	Summit Holdings and Finance Corp., as co-issuers of the 2025 Senior Notes, the 2026 Unsecured Notes and the 2026 Secured Notes
CWA	Clean Water Act
DFW Midstream	DFW Midstream Services LLC
DJ Basin	Denver-Julesburg Basin
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010
DOT	U.S. Department of Transportation
Double E	Double E Pipeline, LLC
Double E Pipeline	a 1.35 Bcf per day, FERC-regulated interstate natural gas transmission pipeline that commenced operations in November 2021 and provides transportation service from multiple receipt points in the Delaware Basin to various delivery points in and around the Waha hub in Texas
dry gas	natural gas primarily composed of methane where heavy hydrocarbons and water either do not exist or have been removed through processing or treating
Dth/d	one million British Thermal Units per day

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EPA	Environmental Protection Agency
Epping	Epping Transmission Company, LLC
Epping Pipeline	an interstate crude oil pipeline in North Dakota, owned and operated by Epping
EPU	earnings or loss per unit
Exchange Act	Securities Exchange Act of 1934, as amended
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
Finance Corp.	Summit Midstream Finance Corp.
fracking	the process of injecting liquid at high pressure into subterranean rocks and boreholes to force open existing fissures and extract oil or gas
frac-protect activities	activities that are designed to protect existing hydrocarbon wells from harm by shutting in existing hydrocarbon production until new well activities have concluded
FTC	Federal Trade Commission
GAAP	accounting principles generally accepted in the United States of America
General Partner	Summit Midstream GP, LLC
GHG	greenhouse gas(es)
GP	general partner
Grand River	Grand River Gathering, LLC
Guarantor Subsidiaries	Bison Midstream and its subsidiaries, Grand River and its subsidiaries, DFW Midstream, Summit Marketing, Summit Permian, Permian Finance, OpCo, Summit Utica, Meadowlark Midstream, Summit Permian II, Mountaineer Midstream, Epping, Red Rock, Polar Midstream and Summit Niobrara
hub	geographic location of a storage facility and multiple pipeline interconnections
ICA	Interstate Commerce Act
Intercreditor Agreement	Intercreditor Agreement, dated as of November 2, 2021, by and among Bank of America, N.A., as first lien representative and collateral agent for the initial first lien claimholders, Regions Bank, as second lien representative for the initial second lien claimholders and as collateral agent for the initial second lien claimholders, acknowledged and agreed to by Summit Holdings and the other grantors referred to therein
IRS	Internal Revenue Service
IT	information technology

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LIBOR	London Interbank Offered Rate
Mbbl/d	one thousand barrels per day
MD&A	Management's Discussion and Analysis of Financial Condition and Results of Operations
MDTQ	maximum daily transportation quantity
Meadowlark Midstream	Meadowlark Midstream Company, LLC
MMBtu	one million British Thermal Units
MMcf	one million cubic feet
MMcf/d	one million cubic feet per day
MMcfe/d	the equivalent of one million cubic feet per day; determined using a ratio of six thousand cubic feet of natural gas to one barrel of liquids
Mountaineer Midstream	Mountaineer Midstream Company, LLC
MVC	minimum volume commitment
NAAQS	national ambient air quality standard
NEPA	National Environmental Policy Act
NDIC	North Dakota Industrial Commission
NGA	Natural Gas Act
NGLs	natural gas liquids; the combination of ethane, propane, normal butane, iso-butane and natural gasolines that when removed from unprocessed natural gas streams become liquid under various levels of higher pressure and lower temperature
NGPA	Natural Gas Policy Act of 1978
Niobrara G&P	Niobrara Gathering and Processing system
Non-Guarantor Subsidiaries	Permian Holdco and Summit Permian Transmission
NYSE	New York Stock Exchange
Obligor Group	the Co-Issuers and the Guarantor Subsidiaries
OCC	Ohio Condensate Company, L.L.C.
OGC	Ohio Gathering Company, L.L.C.
Ohio Gathering	Ohio Gathering Company, L.L.C. and Ohio Condensate Company, L.L.C.
OPA	Oil Pollution Control Act

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OpCo	Summit Midstream OpCo, LP
OT	operational technology
PHMSA	Pipeline and Hazardous Materials Safety Administration
play	a proven geological formation that contains commercial amounts of hydrocarbons
Permian Finance	Summit Midstream Permian Finance, LLC
Permian Holdco	Summit Permian Transmission Holdco, LLC
Permian Term Loan Facility	the term loan governed by the Credit Agreement, dated as of March 8, 2021, among Summit Permian Transmission, LLC, as borrower, MUFG Bank Ltd., as administrative agent, Mizuho Bank (USA), as collateral agent, ING Capital LLC, Mizuho Bank, Ltd. and MUFG Union Bank, N.A., as L/C issuers, coordinating lead arrangers and joint bookrunners, and the lenders from time to time party thereto
Permian Transmission Credit Facilities	the credit facilities governed by the Credit Agreement, dated as of March 8, 2021, among Summit Permian Transmission, LLC, as borrower, MUFG Bank Ltd., as administrative agent, Mizuho Bank (USA), as collateral agent, ING Capital LLC, Mizuho Bank, Ltd. and MUFG Union Bank, N.A., as L/C issuers, coordinating lead arrangers and joint bookrunners, and the lenders from time to time party thereto
Polar and Divide	the Polar and Divide system; collectively Polar Midstream and Epping
Polar Midstream	Polar Midstream, LLC
produced water	water from underground geologic formations that is a by-product of natural gas and crude oil production
PSD	Prevention of Significant Deterioration
RCRA	Resource Conservation and Recovery Act
Red Rock Gathering	Red Rock Gathering Company, LLC
Revolving Credit Facility	the Third Amended and Restated Credit Agreement dated as of May 26, 2017, as amended by the First Amendment to Third Amended and Restated Credit Agreement dated as of September 22, 2017, the Second Amendment to Third Amended and Restated Credit Agreement dated as of June 26, 2019, the Third Amendment to Third Amended and Restated Credit Agreement dated as of December 24, 2019 and the Fourth Amendment to the Third Amended and Restated Credit Agreement dated as of December 18, 2020
SEC	Securities and Exchange Commission
Securities Act	Securities Act of 1933, as amended
segment adjusted EBITDA	total revenues less total costs and expenses; plus (i) other income excluding interest income, (ii) our proportional adjusted EBITDA for equity method investees, (iii) depreciation and amortization, (iv) adjustments related to MVC shortfall payments, (v) adjustments related to capital reimbursement activity, (vi) unit- based and noncash compensation, (vii) impairments and (viii) other noncash expenses or losses, less other noncash income or gains

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Senior Notes	The 2025 Senior Notes, the 2026 Unsecured Notes and the 2026 Secured Notes, collectively
Series A Preferred Units	Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units issued by the Partnership
shortfall payment	the payment received from a counterparty when its volume throughput does not meet its MVC for the applicable period
SMLP	Summit Midstream Partners, LP
SMLP LTIP	SMLP Long-Term Incentive Plan
SMP Holdings	Summit Midstream Partners Holdings, LLC, also known as SMPH
SMPH Term Loan	SMPH Holdings’ term loan, governed by the Term Loan Agreement, dated as of March 21, 2017, among SMP Holdings, as borrower, the lenders party thereto and Credit Suisse AG, Cayman Islands Branch, as Administrative Agent and Collateral Agent
SOFR	Secured Overnight Financing Rate
SPCC	Spill Prevention Control and Countermeasure
Subsidiary Series A Preferred Units	Series A Fixed Rate Cumulative Redeemable Preferred Units issued by Permian Holdco
Summit Holdings	Summit Midstream Holdings, LLC
Summit Investments	Summit Midstream Partners, LLC
Summit Marketing	Summit Midstream Marketing, LLC
Summit Niobrara	Summit Midstream Niobrara, LLC
Summit Permian	Summit Midstream Permian, LLC
Summit Permian II	Summit Midstream Permian II, LLC
Summit Permian Transmission	Summit Permian Transmission, LLC
Summit Utica	Summit Midstream Utica, LLC
Tax Reform Legislation	the Tax Cuts and Jobs Act of 2017
Tcfe	the equivalent of one trillion cubic feet
the Partnership	Summit Midstream Partners, LP and its subsidiaries
the Partnership Agreement	the Fourth Amended and Restated Agreement of Limited Partnership of the Partnership dated May 28, 2020, as amended by Amendment No. 1 to the Fourth Amended and Restated Agreement of Limited Partnership, dated February 23, 2023
throughput volume	the volume of natural gas, crude oil or produced water gathered, transported or passing through a pipeline, plant or other facility during a particular period; also referred to as volume throughput

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Tioga Midstream	Tioga Midstream, LLC
unconventional resource basin	a basin where natural gas or crude oil production is developed from unconventional sources that require hydraulic fracturing as part of the completion process, for instance, natural gas produced from shale formations and coalbeds; also referred to as an unconventional resource play
VOC	volatile organic compound(s)
wellhead	the equipment at the surface of a well, used to control the well's pressure; also, the point at which the hydrocarbons and water exit the ground

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PART I

ITEM 1. BUSINESS

Summit Midstream Partners, LP, a Delaware limited partnership (including its subsidiaries, collectively, “we”, “our”, “us”, “SMLP”, or “the Partnership”), is a value-driven limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States. Our common units are listed and traded on the NYSE under the ticker symbol “SMLP.”

The Partnership was formed in May 2012. The Partnership’s executive offices are located at 910 Louisiana Street, Suite 4200, Houston, Texas 77002, and can be reached by phone at 832-413-4770. The Partnership also maintains regional field offices in close proximity to our areas of operation to support the operation and development of our midstream assets.

Our Business Strategies

We operate a differentiated midstream platform that is built for long-term, sustainable value creation. Our integrated assets are strategically located in production basins including the Williston Basin, DJ Basin, Utica Shale, Marcellus Shale, Barnett Shale, Piceance Basin and Permian Basin. Our primary business objective is to maximize cash flow and provide cash flow stability for our stakeholders while growing prudently and profitably. We intend to accomplish this objective by executing the following strategies:

•Capital structure optimization. We seek to maximize unitholder value. Our capital structure currently consists of common equity, preferred equity, and indebtedness that is comprised of debt securities and borrowings under our revolving credit facilities, a portion of which is secured by substantially all of the Partnership's assets. We intend to optimize our capital structure in the future by reducing our indebtedness with free cash flow, and when appropriate, we may pursue opportunistic capital markets transactions or asset divestitures with the objective of increasing long-term unitholder value.

•Portfolio management. We seek to maximize unitholder value by strategically managing our portfolio of midstream assets and allocating capital based on appropriate risk-informed cash flow assumptions. This may include opportunistic divestitures, re-allocation of capital to new or existing areas, and development of joint ventures involving our existing midstream assets or new investment opportunities.

•Maintaining our focus on fee-based revenue with minimal direct commodity price exposure. We intend to maintain our focus on providing midstream services under primarily long-term and fee-based contracts. We believe that our focus on fee-based revenues with minimal direct commodity price exposure is essential to maintaining stable cash flows.

•Maintaining strong producer relationships to maximize utilization of all of our midstream assets. We have cultivated strong producer relationships by focusing on customer service and reliable project execution and by operating our assets safely and reliably over time. We believe that our strong producer relationships will create future opportunities to expand our midstream services reach and optimize the utilization of our midstream assets for our customers.

•Continuing to prioritize safe and reliable operations. We believe that providing safe, reliable and efficient operations is a key component of our business strategy. We place a strong emphasis on employee training, operational procedures and enterprise technology, and we intend to continue promoting a high standard with respect to the efficiency of our operations and the safety of all of our constituents.

Recent Developments and Highlights

The following is a brief listing of significant developments and highlights for the year ended December 31, 2023. Additional information regarding these items may be found elsewhere in this Annual Report.

•Strategic review. As we previously announced in October 2023, based on the Partnership’s recent and expected financial performance, as well as interest from third parties for potential transactions, ranging from the sale of specific assets to consideration for the whole Partnership, the Partnership’s Board of Directors has engaged external advisors to evaluate strategic alternatives for the Partnership with the goal of maximizing value for the Partnership’s unitholders. These alternatives may include, but are not limited to, continued execution of the Partnership’s business plan, sale of assets, refinancing parts or the entirety of its capital structure, sale of the Partnership by merger or cash, or any combination of these and other alternatives.

If the Partnership’s Board of Directors decides to proceed with a strategic transaction, it may not be at a price that the Partnership’s investors view as attractive relative to the value of our standalone business. Additionally, the closing of any such transaction would be dependent upon a number of factors that may be

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beyond the Partnership’s control, including, among other factors, market conditions, regulatory factors, industry trends, the interest of third parties in the Partnership’s business and the availability of financing to potential buyers on reasonable terms. If the Partnership’s Board of Directors decides not to proceed with a strategic transaction, this could have a negative effect on the market price and volatility of the Partnership’s common units.

•Refinancing of 2025 Senior Notes. In November 2023, we entered into a private agreement to issue a total of $209.5 million aggregate principal amount of unsecured notes (the “2026 Unsecured Notes”) in exchange for $180.0 million aggregate principal amount of our existing 2025 Senior Notes and $29.5 million in cash (the “2023 Exchange”). The exchanged 2025 Senior Notes were cancelled. The cash raised was used to repurchase $29.7 million aggregate principal amount of existing 2025 Senior Notes (together with the 2023 Exchange, the “2023 Exchange Transactions”) that were not exchanged. As of December 31, 2023, following the consummation of the 2023 Exchange Transactions, approximately $49.8 million of 2025 Senior Notes remained outstanding. This refinancing event allowed us to extend the maturity of a portion of our 2025 Senior Notes to October 15, 2026, in line with the maturity date of our 2026 Secured Notes.

•Integration of DJ Acquisitions. In December 2022, we completed the 2022 DJ Acquisitions. As a result of the 2022 DJ Acquisitions, we acquired natural gas gathering and processing systems, a crude oil gathering system, freshwater rights, and freshwater delivery system in the DJ Basin. The acquired assets of Outrigger DJ and Sterling DJ are located in Weld, Morgan, and Logan Counties, Colorado and Cheyenne County, Nebraska. During 2023, we continued to integrate the 2022 DJ Acquisitions into our existing DJ Basin assets and began to achieve capital and operating synergies. Those integration efforts will continue into 2024.

•Capital structure optimization and portfolio management. We intend to optimize our capital structure in the future by reducing our indebtedness with free cash flow, and when appropriate, we may pursue opportunistic transactions with the objective of increasing long-term unitholder value. This may include opportunistic acquisitions (such as the 2022 DJ Acquisitions), divestitures (such as the dispositions of the Lane G&P System and Bison Midstream in 2022), re-allocation of capital to new or existing areas, and development of joint ventures involving our existing midstream assets or new investment opportunities. We believe that our internally generated cash flow, our ABL Facility, the Permian Term Loan Facility, and access to debt or equity will be adequate to finance our strategic initiatives. To attain our overall corporate strategic objectives, we may conduct an asset divestiture, or divestitures, at a transaction valuation that is less than the net book value of the divested asset.

Our Midstream Assets

Our midstream assets primarily gather natural gas produced from pad sites, wells and central receipt points connected to our systems. Gathered natural gas volumes are then compressed, dehydrated, treated and/or processed for delivery to downstream pipelines serving processing plants or end users. We also contract with producers to gather crude oil and produced water from wells connected to our systems for delivery to downstream pipelines and to third-party rail terminals in the case of crude oil and to third-party disposal wells in the case of produced water. We generally refer to most of the services our systems provide as gathering services. We also provide natural gas transmission services via Double E, a long-haul natural gas pipeline in which we indirectly own a 70% equity interest and serve as the pipeline’s operator. Double E provides natural gas transportation services from multiple receipt points in the Permian Basin to various delivery points in and around the Waha hub in Texas.

Reportable Segments. As of December 31, 2023, our reportable segments are below along with management’s categorization of the primary commodity driving customer drilling and completion decisions for each segment:

Oil price driven. Our cash flows in the Rockies and Permian segments are primarily influenced by the prevailing price of crude oil because the drilling and completion decisions by our customers in these segments are based on well economics most heavily tied to crude oil prices. Our customers’ decisions to drill and complete wells in these segments therefore result in higher volume throughput and cash flows for our midstream assets in which we collect fixed fees for gathering or processing hydrocarbons, gathering produced water, or transporting residue natural gas.

•Rockies – Includes our wholly owned midstream assets located in the Williston Basin and the DJ Basin.

•Permian – Includes our equity method investment in Double E.

Natural gas price driven. Our cash flows in the Northeast, Piceance and Barnett segments are primarily influenced by the prevailing price of natural gas because the drilling, completion and recompletion decisions by our customers in these segments are based on well economics most heavily tied to natural gas and NGL prices. Our customers’ decisions to drill, complete or recomplete wells in these segments therefore result in higher throughput and cash flows for those segments in which we collect fixed fees for gathering natural gas.

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•Northeast – Includes our wholly owned midstream assets located in the Utica and Marcellus shale plays and our equity method investment in Ohio Gathering that is focused on the Utica Shale.

•Piceance – Includes our wholly owned midstream assets located in the Piceance Basin.

•Barnett – Includes our wholly owned midstream assets located in the Barnett Shale.

Industry Overview and Commercial Arrangements

We compete with other midstream companies, producers and intrastate and interstate pipelines. Competition for volumes is primarily based on reputation, commercial terms, acreage dedications, service levels, access to end-use markets, geographic proximity of existing assets to a producer's acreage and available gathering and processing capacity. We may also face competition to gather production outside of our AMIs and attract producer volumes to our gathering systems.

We earn revenue by providing gathering, compression, treating and/or processing services pursuant to primarily long-term and fee-based gathering and processing agreements with some of the largest and most active producers in North America. Through our equity method investment in the Double E Pipeline, we earn revenue by providing high pressure transportation services, as both firm and interruptible service, for residue natural gas in the Permian Basin. The fee-based nature of these agreements enhances the stability of our cash flows by limiting our direct commodity price exposure.

The significant features of our transportation and gathering and processing agreements, and the gathering and transportation systems to which they relate, are discussed in more detail below. For additional operating and financial performance information, on a consolidated basis and by reportable segment, see the "Results of Operations" section in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.

Areas of Mutual Interest. The vast majority of our gathering and processing agreements contain AMIs, some of which extend through 2039. The AMIs generally require that any production by our customers within the AMIs will be gathered and/or processed by our assets. In general, our customers have not leased acreage that cover our entire AMIs but, to the extent that they have leased acreage within our AMI, or lease additional acreage within our AMIs, any production from wells within that AMI will be dedicated to our systems.

Under certain of our gathering agreements, we have agreed to construct pipeline laterals to connect our gathering systems to producer pad sites located within the AMI. However, in certain circumstances we may choose not to pursue a pad connection opportunity presented by a customer if we believe that the investment would not meet our internal return expectations. Under this scenario, the customer may, in certain circumstances, construct the gathering infrastructure itself and sell it to us at a price equal to their cost plus an applicable profit margin, or, in some cases, we may release the relevant acreage dedication from the AMI.

Our AMIs cover approximately 4.0 million surface acres in the aggregate, which includes more than 0.8 million surface acres associated with Ohio Gathering.

Minimum Volume Commitments. Certain of our gathering and/or processing agreements contain MVCs which, like AMIs, benefit from the development and ongoing operation of a gathering system because they provide a minimum contracted monthly or annual revenue stream. Some of our MVCs, including those of affiliates, extend through 2031. To the extent a customer does not meet its contractual MVC, it is obligated to make an MVC shortfall payment to us to cover the shortfall of required volume throughput not shipped or processed, either on a monthly or annual basis. We have designed our MVC provisions to ensure that we will generate a minimum amount of revenue from each customer over the life of the associated gathering and/or processing agreement, by either collecting gathering or processing fees on actual throughput or from cash payments to cover any MVC shortfall.

As of December 31, 2023, we had remaining MVCs totaling 0.5 Tcfe, our MVCs had a weighted-average remaining life of 3.2 years, and these MVC's average approximately 267 MMcfe/d through 2028.

For additional information on our MVCs, see Note 4 – Revenue and Note 8 – Deferred Revenue to the consolidated financial statements.

Throughput and Commodity Price Exposure. Our financial results are primarily driven by volume throughput across our gathering systems and by expense management. During 2023, aggregate natural gas volume throughput averaged 1,292 MMcf/d and crude oil and produced water volume throughput averaged 78 Mbbl/d. A majority of the volumes that we gather, compress, treat and/or process have a fixed-fee rate structure, which enhances the stability of our cash flows by providing a revenue stream that is not subject to direct commodity price risk or volatility. We also earn a portion of our revenues from the following activities that directly expose us to fluctuations in commodity prices: (i) the sale of physical natural gas and/or NGLs purchased under percentage-of-proceeds or other processing arrangements with certain of our customers in the Rockies and Piceance segments, (ii) the sale of natural gas we retain from certain Barnett customers, (iii) the sale of condensate we retain from our gathering services in the Rockies and Piceance segments and (iv) additional gathering fees that are tied to performance

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of certain commodity price indexes, which are then added to the fixed gathering rates. During the year ended December 31, 2023, these additional activities accounted for approximately 39% of total revenues.

Equity Method Investment – Ohio Gathering. We have an equity method investment in Ohio Gathering, which comprises a natural gas gathering system and condensate stabilization facility located in the core of the Utica Shale in southeastern Ohio. Our joint venture partner in Ohio Gathering may elect to fund 100% of a capital call if we choose not to fund our proportionate share of such capital call. In 2023 and 2022, we chose to not fund capital calls in Ohio Gathering because the investment did not meet our corporate objectives, and, as a result, our ownership interest in that venture was reduced to 36.5% as of December 31, 2023, from 37.2% as of December 31, 2022. MPLX LP (“MPLX”) is the operator of the Ohio Gathering joint venture and our joint venture partner.

Equity Method Investment – Double E. We have an equity method investment in Double E, a 1.35 Bcf/d FERC-regulated interstate natural gas transmission pipeline that commenced operations in November 2021 and provides transportation service from multiple receipt points in the Delaware Basin to various delivery points in and around the Waha hub in Texas. We are the operator of the joint venture and have made all required capital contributions to Double E. As of December 31, 2023, the Partnership owns a 70% interest in Double E. A subsidiary of ExxonMobil Corporation is our joint venture partner.

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Overview of our Segments

Northeast.

The following table provides operating information regarding our Northeast reportable segment as of December 31, 2023.

	Aggregate throughput capacity (MMcf/d)	Average daily MVCs through 2028 (MMcf/d)	Remaining MVCs (Bcf)	Weighted-average remaining contract life (Years)	Weighted-average remaining MVC life (Years)
Northeast (1)	1,770	144	263	6.2	3.0
Ohio Gathering (2)	1,183	n/a	n/a	8.1	n/a

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(1) Includes our wholly owned assets, Summit Utica system and Mountaineer Midstream system

(2) Presented on a gross basis. As of December 31, 2023, we owned an approximate 36.5% interest in OGC and an approximate 38.2% interest in OCC.

Our Northeast segment is comprised of our Summit Utica system, our Mountaineer Midstream system, and our equity method investments in Ohio Gathering.

Summit Utica system. The Summit Utica system is a natural gas gathering system located in Belmont and Monroe counties in southeastern Ohio and serves producers targeting the dry gas reserves of the Utica and Point Pleasant shale formations. The Summit Utica system gathers and delivers natural gas, primarily under long-term, fee-based gathering agreements, which include acreage dedications. Ascent Resources, a large U.S. independent crude oil and natural gas company, is the key customer of Summit Utica, and the AMIs from our customers for this system cover approximately 115,000 surface acres in the aggregate.

We have connected a substantial number of our customers’ pad sites to our Summit Utica system and we expect to benefit from incremental volumes arising from drilling and completion activity that is occurring and will continue to occur on new and previously connected pad sites in our service area. Over time, we intend to expand our midstream service offerings for the Summit Utica system to connect additional customer pad sites and install centralized compression facilities. Centralized compression services have been dedicated to us in our gathering agreements and will eventually constitute a new revenue stream from our customers; however, to date, this service has not been required given the relatively high downhole pressures exhibited by dry gas wells in the Utica Shale compared to other unconventional shale plays.

The Summit Utica system interconnects with the Ohio River System pipeline, which provides access to the Clarington Hub and Rover Pipeline.

Mountaineer Midstream system. The Mountaineer Midstream system, within the Marcellus shale, is located in Doddridge and Harrison counties in West Virginia where it gathers natural gas under a long-term, fee-based contract with Antero Resources Corporation (“Antero”), which is targeting liquids-rich natural gas production from the Marcellus shale in the Appalachian Basin. Volume throughput on the Mountaineer Midstream system is underpinned by minimum revenue commitments from Antero.

The Mountaineer Midstream system consists of a high-pressure natural gas gathering system and two compressor stations. This system gathers high-pressure natural gas received from upstream pipeline interconnections with Antero Midstream. Mountaineer Midstream serves as a critical inlet to the Sherwood Processing Complex, a primary destination for liquids-rich natural gas in northern West Virginia and one of the largest natural gas processing facilities in the United States.

Ohio Gathering. Ohio Gathering comprises a natural gas gathering system and condensate stabilization facility located in the core of the Utica Shale in southeastern Ohio. The gathering system spans the condensate, liquids-rich and dry gas windows of the Utica Shale for multiple producers that are targeting production from the Utica and Point Pleasant shale formations across Belmont, Monroe, Guernsey, Harrison and Noble counties in southeastern Ohio. Ohio Gathering is operated by our partner, MPLX. Substantially all gathering services on the Ohio Gathering system are provided pursuant to long-term, fee-based gathering agreements. Ascent Resources and Gulfport Energy Corporation are Ohio Gathering's key customers and the AMIs from our customers for this system cover approximately 836,000 surface acres in the aggregate.

Condensate and liquids-rich natural gas production is gathered, compressed, dehydrated and delivered to the Cadiz and Seneca processing complexes, which offer approximately 1.3 Bcf/d of processing capacity and are owned by a joint venture between MPLX and The Energy and Minerals Group. Dry gas production is gathered, dehydrated, compressed, and delivered to third-party pipelines serving the northeast and midwest markets.

As of December 31, 2023, we owned an approximate 36.5% interest in OGC and an approximate 38.2% interest in OCC. For additional information, see Note 7 - Equity Method Investments to the consolidated financial statements.

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Rockies.

The following table provides operating information regarding our Rockies reportable segment as of December 31, 2023.

	Aggregate throughput capacity - liquids (Mbbl/d)	Aggregate throughput capacity - natural gas (MMcf/d)	Average daily MVCs through 2028 (MMcf/d)	Remaining MVCs (Bcfe)	Weighted-average remaining contract life (Years)	Weighted-average remaining MVC life (Years)
Rockies - Williston	225	n/a	n/a	n/a	6.0	n/a
Rockies - DJ (1)	50	220	10	19	7.8	4.6

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(1)Capacity of 220 MMcf/d represents nameplate processing capacity. Operational capacity is estimated at approximately 180 MMcf/d. Weighted average remaining life excludes interruptible off-load contracts.

AMIs for the Rockies reportable segment total approximately 2.5 million surface acres in the aggregate.

Our Rockies reportable segment is comprised of our Polar and Divide system and the Niobrara G&P system.

Polar and Divide system. The Polar and Divide system, collectively Polar Midstream and Epping, which is located primarily in Williams and Divide counties in northwestern North Dakota, owns, operates and is currently developing crude oil and produced water gathering systems and transmission pipelines serving multiple customers that are targeting crude oil production from the Bakken and Three Forks shale formations. The Polar and Divide system is underpinned by long-term, fee-based gathering agreements, which include acreage dedications. Chord Energy Corporation, Zavanna LLC, Enerplus Corporation, which announced a merger with Chord Energy Corporation in February 2024, and Kraken Resources are the key customers of the Polar and Divide system.

Crude oil that is gathered by the Polar and Divide system is delivered to interconnects with (i) the Dakota Access Pipeline, (ii) the COLT Hub rail facility and (iii) Enbridge Inc’s North Dakota Pipeline System. Produced water is delivered to third-party or producer owned disposal facilities.

Niobrara G&P system. The Niobrara G&P system is located near Hereford, Colorado, in rural Weld, Morgan and Logan Counties, and in Cheyenne County of Nebraska. Weld County is the largest crude oil and natural gas producing county in Colorado. Gathering and processing services on the Niobrara G&P system are provided pursuant to long-term, fee-based and percentage of proceeds agreements with producers that are primarily targeting crude oil production from the Niobrara and Codell shale formations. Bison Oil and Gas IV, Chevron Corporation, Civitas Resources, Inc., a large U.S. independent crude oil and natural gas company and Verdad Resources are the key customers of the Niobrara G&P system and have underpinned our volume throughput with acreage dedications and MVCs.

The Niobrara G&P system operates a low-pressure associated natural gas gathering system, and natural gas processing plants with processing capacity of up to 220 MMcf/d. 

Residue gas is delivered to the Cheyenne Plains, Colorado Interstate Gas, Tallgrass Interstate Gas Transmission, Trailblazer Pipeline and Southern Star and processed NGLs are delivered to the Overland Pass Pipeline and the P66 NGL System.

Additionally, the system has discrete freshwater infrastructure that consists of 19 water wells and other infrastructure to provide its customers with up to approximately 55,000 barrels per day of fresh water for well completion activities. The crude gathering system includes approximately 30 miles of gathering pipeline with delivery into the Pony Express pipeline.

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Permian.

The following table provides operating information regarding our Permian reportable segment as of December 31, 2023.

	Aggregate throughput capacity (MMcf/d)	Average daily MVCs through 2028 (MMcf/d)	Remaining MVCs (Bcf)	Weighted-average remaining contract life (Years)	Weighted-average remaining MVC life (Years)
Double E (1)	1,350	997	2,873	7.8	7.8

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(1) Presented on a gross basis. Existing MVC’s contractually increase to 1.0 Bcf/d beginning in November 2024. As of December 31, 2023, we owned a 70% interest in Double E. Statistics exclude recently announced Janus Processing Plant connection and associated take-or-pay contract, which has an expected in-service date of Q1 2025.

Double E. Double E is a 135 mile, 1.35 Bcf/d, FERC-regulated interstate natural gas transmission pipeline that commenced operations in November 2021 and provides transportation service from receipt points in the Delaware Basin to various delivery points in and around the Waha hub in Texas. Double E is underpinned by 1.0 Bcf/d of long-term take-or-pay contracts with ExxonMobil Corporation, Marathon Oil and Matador Resources Company (“Matador”). In 2021, we entered into negotiated rate agreements with an average term of 10 years from the in-service date of the pipeline, which occurred on November 18, 2021 and with total MDTQ’s that increase from 585,000 Dth/d during the first year of the agreement to 1,000,000 Dth/d in the fourth year, which equates to approximately 74% of its certificated capacity of 1,350,000 Dth/d. Volume throughput is received from multiple processing plants, including Enlink’s Lobo plant, Matador’s Marlan plant, XTO’s Cowboy plant, Targa’s Roadrunner plant, San Mateo’s Black River plant and Crestwood’s Carlsbad plant. In 2023, Double E executed a new 40 MMcf/d contract with a large U.S. independent crude oil and natural gas company, which includes a connection to the Janus Processing Plant that is currently under construction with an expected in-service date in Q1 2025. The take-or-pay contract has a 10-year term upon the earlier of the in-service date of the Janus Processing Plant, or April 1, 2025. The Partnership owns 70% of Double E and operates the pipeline.

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Piceance.

The following table provides operating information regarding our Piceance reportable segment as of December 31, 2023.

	Aggregate throughput capacity (MMcf/d)	Average daily MVCs through 2028 (MMcf/d)	Remaining MVCs (Bcf)	Weighted-average remaining contract life (Years)	Weighted-average remaining MVC life (Years)
Piceance	1,622	113	206	8.0	2.5

AMIs for the Piceance reportable segment cover approximately 434,000 surface acres in the aggregate.

Our Piceance reportable segment is comprised of our Grand River gathering system.

Grand River system. Grand River is primarily located in Garfield County, one of the largest natural gas producing counties in Colorado. The Grand River system provides natural gas gathering services pursuant to primarily long-term and fee-based agreements with multiple producers, including its key customers, Caerus Oil and Gas and Terra Energy Partners. Volume throughput on the Grand River system is underpinned with acreage dedications and MVCs.

The Grand River system is primarily a low-pressure gathering system located in western Colorado that gathers natural gas produced from directional wells targeting the liquids-rich Mesaverde formation. The Grand River system also gathers natural gas produced from the Mancos and Niobrara shale formations.

Natural gas gathered and/or processed on the Grand River system is compressed, dehydrated, processed and/or discharged to downstream pipelines serving (i) the Meeker Processing Complex, (ii) the Williams Processing Complex and (iii) the TransColorado Pipeline system. Processed NGLs from Grand River are injected into the Mid-America Pipeline system or delivered to local markets. Residue gas has access to multiple pipelines and end markets. In addition, certain of our gathering agreements with our customers on the Grand River system permit us to retain, and monetize for our own account, condensate volumes that naturally discharge from the liquids-rich natural gas as it moves across our system.

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Barnett.

The following table provides operating information regarding our Barnett reportable segment as of December 31, 2023.

	Throughput capacity (MMcf/d)	Average daily MVCs through 2028 (MMcf/d)	Remaining MVCs (Bcf)	Weighted-average remaining contract life (Years)	Weighted-average remaining MVC life (Years)
Barnett	450	n/a	n/a	4.0	n/a

AMIs for the Barnett reportable segment cover approximately 124,000 surface acres.

Our Barnett reportable segment is comprised of DFW Midstream system.

DFW Midstream system. The DFW Midstream system is primarily located in southeastern Tarrant County, in north-central Texas. We consider this area to be the core of the Barnett Shale because of the quality of the geology and the high production profile of the wells drilled to date in our service area. The DFW Midstream system is underpinned by a long-term, fee-based gathering agreements with TotalEnergies Gas & Power North America, Inc. (“Total”) and other customers. Total is the key customer for DFW Midstream.

The DFW Midstream system includes natural gas gathering pipelines located under both private and public property and is partially located along existing electric transmission corridors. Compression on the system is powered by electricity. To offset the costs we incur to operate the system's electric-drive compressors, we either pass through a portion of the power expense to our customers or retain and sell a fixed percentage of the natural gas that we gather.

The DFW Midstream system currently has five primary interconnections with third-party, primarily intrastate pipelines. These interconnections enable us to connect our customers, directly or indirectly, with the major natural gas market hubs in Texas and Louisiana.

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Our Customers

The systems that we operate and/or have significant ownership interests in have a diverse group of customers and counterparties comprising affiliates and/or subsidiaries of some of the largest natural gas and crude oil producers in North America.

Regulation of the Natural Gas and Crude Oil Industries

General. Sales by producers of natural gas, crude oil, condensate and NGLs are currently made at market prices. However, gathering and transportation services are subject to various types of regulation, which may affect certain aspects of our business and the market for our services. FERC regulates the transportation of natural gas in interstate commerce and the interstate transportation of crude oil, petroleum products and NGLs. FERC regulation includes reviewing and accepting or approving rates and other terms and conditions for such transportation services and authorizing and regulating the construction and operation of interstate natural gas pipelines. FERC is also authorized to prevent and sanction market manipulation in natural gas markets while the FTC is authorized to prevent and sanction market manipulation in petroleum markets and the CFTC is authorized to prevent and sanction fraud and price manipulations in the commodity and futures markets, including the energy futures markets. State and municipal regulations may apply to the production and gathering of certain natural gas, the construction and operation of natural gas and crude oil facilities and the rates and practices of gathering systems and intrastate pipelines.

Regulation of Crude Oil and Natural Gas Exploration, Production and Sales. Sales of crude oil and NGLs are not currently regulated and are transacted at market prices. In 1989, the U.S. Congress enacted the Natural Gas Wellhead Decontrol Act, which removed all remaining price and non-price controls affecting wellhead sales of natural gas. FERC, which has the authority under the NGA to regulate the prices and other terms and conditions of the sale of natural gas for resale in interstate commerce, has issued blanket authorizations for all gas resellers subject to its regulation, except interstate pipelines, to resell natural gas at market prices. Either Congress or FERC (with respect to the resale of gas in interstate commerce), however, could re-impose price controls in the future.

Exploration and production operations are subject to various types of federal, state and local regulation, including, but not limited to, permitting, well location, methods of drilling, well operations and conservation of resources. While these regulations do not directly apply to our business, they may affect our customers' ability to produce natural gas.

Regulation of the Gathering and Transportation of Natural Gas and Crude Oil. We believe that the majority of our natural gas pipeline facilities qualify as gathering facilities that are exempt from the jurisdiction of FERC. Our Double E Pipeline, which is an interstate natural gas pipeline located in New Mexico and Texas, and Epping Pipeline interstate crude oil pipeline, which is located in North Dakota and owned and operated by Epping, are subject to FERC’s jurisdiction and oversight pursuant to FERC's authority under the NGA and the ICA, respectively. Epping and Double E have tariffs on file with FERC.

In addition to approving and regulating the construction and operation of interstate natural gas pipelines, FERC also regulates such pipelines’ rates and terms and conditions of service, including transportation service agreements and negotiated rate agreements.

Under FERC’s ICA jurisdiction, rates for interstate movements of liquids by pipeline are currently regulated primarily through an annual indexing methodology, under which pipelines increase or decrease their existing rates in accordance with a FERC-specified adjustment that sets a rate ceiling. This adjustment, which may be positive or negative in a given year, is subject to review every five years. For the five-year period beginning on July 1, 2021, FERC established an annual index adjustment equal to the change in the producer price index for finished goods minus 0.21%. FERC’s orders establishing this adjustment are subject to pending judicial review.

Under current FERC regulations, liquids pipelines can request a rate increase that exceeds the rate obtained through the indexing methodology by using a cost-of-service approach, but a pipeline must establish that a substantial divergence exists between its actual costs and the rates resulting from the indexing methodology.

The ICA permits interested persons to challenge proposed new or changed rates and authorizes FERC to suspend the effectiveness of such rates for up to seven months and investigate such rates. If, upon completion of an investigation, FERC finds that the new or changed rate is unlawful, it is authorized to require the pipeline to refund revenues collected in excess of the just and reasonable rate during the term of the investigation. FERC may also investigate, upon complaint or on its own motion, rates that are already in effect and may order a carrier to change its rates prospectively. Under certain circumstances, FERC could limit Epping’s ability to set rates based on costs or could order reduced rates and reparations to complaining shippers for up to two years prior to the date of a complaint. FERC also has the authority to change terms and conditions of service if it determines that they are unjust and unreasonable or unduly discriminatory or preferential. The ICA also imposes potential criminal liability for certain violations of the statute.

FERC has jurisdiction over, among other things, the construction, ownership and commercial operation of pipelines and related facilities used in the transportation and storage of natural gas in interstate commerce, including the modification, extension,

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enlargement, and abandonment of such facilities. FERC also has jurisdiction over the rates, charges, and term and conditions of service for the transportation and storage of natural gas in interstate commerce. With respect to transportation rates, FERC exercises its ratemaking authority by applying cost-of-service principles to limit the maximum and minimum levels of tariff-based recourse rates; however, it also allows for discounted or negotiated rates as an alternative to cost-based rates. In addition, FERC regulations also restrict interstate natural gas pipelines from sharing certain transportation or customer information with marketing affiliates and require that the transmission function personnel of interstate natural gas pipelines operate independently of the marketing function personnel of the pipeline or its affiliates.

Pursuant to the NGA, existing interstate natural gas transportation and storage rates and terms and conditions of service may be challenged by complaint and are subject to prospective change by FERC. Additionally, rate changes and changes to terms and conditions of service proposed by a regulated natural gas interstate pipeline may be protested and such changes can be delayed and may ultimately be rejected by FERC. FERC may also initiate reviews of an interstate pipeline’s rates. Double E currently holds authority from the FERC to charge and collect (i) “recourse rates,” which are the maximum cost-based rates an interstate natural gas pipeline may charge for its services under its tariff; (ii) “discount rates,” which are rates offered by the natural gas pipeline to shippers at discounts vis-à-vis the recourse rates and that fall within the cost-based maximum and minimum rate levels set forth in the natural gas pipeline's tariff; and (iii) “negotiated rates,” which are rates negotiated and agreed to by the pipeline and the shipper for the contract term that may fall within or outside of the cost-based maximum and minimum rate levels set forth in the tariff, and which are individually filed with the FERC for review and acceptance. On November 18, 2021, we entered into negotiated rate agreements with an average term of 10 years from the in-service date of the pipeline and with total MDTQ’s that increase from 585,000 Dth/d during the first year of the agreement to 1,000,000 Dth/d in the fourth year, which equates to approximately 74% of its certificated capacity of 1,350,000 Dth/d. When capacity is available and offered for sale, the rates (which include reservation, commodity, surcharges, and fixed fuel and lost and unaccounted for charges) and the terms and conditions at which such capacity is sold are subject to regulatory approval and oversight. Any successful challenge by a regulator or shipper in any of these matters could have a material adverse effect on our business, financial condition and results of operations.

Intrastate pipelines, which may include some pipelines that perform gathering functions, may be subject to safety regulation by the DOT, although typically state regulatory authorities (operating under a federal certification) perform this function. State regulatory authorities also have jurisdiction over the rates and practices of intrastate pipelines and gathering systems, including requirements for ratable takes or non-discriminatory access to pipeline services. The basis for state regulation and the degree of regulatory oversight of gathering systems and intrastate pipelines varies from state to state. In Texas, we are regulated as a gas utility and have filed tariffs with the Railroad Commission of Texas to establish rates and terms of service for our DFW Midstream system assets. We have not been required to file tariffs in the other states in which we operate, although we are required to submit shape files and other information regarding the location and construction of underground gathering pipelines in North Dakota. The states in which we operate have adopted complaint-based regulation that allows natural gas producers and shippers to file complaints with state regulators in an effort to resolve access issues and rate grievances, among other matters. State authorities in the states in which we operate generally have not initiated investigations of the rates or practices of gathering systems or intrastate pipelines in the absence of a complaint. State regulation of intrastate pipelines continues to evolve and may become more stringent in the future.

Natural gas, crude oil and produced water production, gathering and transportation, including the construction of new gathering facilities and expansion of existing gathering facilities may also be subject to local regulation, such as approval and permit requirements.

Statutory Compliance and Anti-Market Manipulation Rules. We are subject to the anti-market manipulation and penalty provisions in the NGA and the NGPA, as amended by the Energy Policy Act of 2005, which authorize FERC to impose fines of up to approximately $1.5 million per day per violation of the NGA, the NGPA, or their implementing rules, regulations, and orders subject to future adjustments for inflation. In addition, the FTC holds statutory authority under the Energy Independence and Security Act of 2007 to prevent market manipulation in petroleum markets, including the authority to request that a court impose fines of up to approximately $1.5 million per violation, subject to future adjustment for inflation. These agencies have promulgated broad rules and regulations prohibiting fraud and manipulation in oil and gas markets. The CFTC is directed under the CEA to prevent price manipulations in the commodity and futures markets, including the energy futures markets. Pursuant to statutory authority, the CFTC has adopted anti-market manipulation regulations that prohibit fraud and price manipulation in the commodity and futures markets. The CFTC also has statutory authority to seek civil penalties of up to the greater of approximately $1.5 million per day per violation, subject to future adjustment for inflation, or triple the monetary gain to the violator for violations of the anti-market manipulation sections of the CEA. We are also subject to various reporting requirements that are designed to facilitate transparency and prevent market manipulation.

Safety and Maintenance. We are subject to regulation by the DOT, which establishes federal safety standards for the design, construction, operation and maintenance of natural gas and crude oil pipeline facilities. In the Pipeline Safety Act of 1992, Congress expanded the DOT's regulatory authority to include regulated gathering lines that had previously been exempt from

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federal jurisdiction. Additional legislation has been passed over the years to reauthorize federal funding for federal pipeline programs, increase penalties for safety violations and establish additional safety requirements. For example, in December 2020, the Protecting our Infrastructure of Pipelines and Enhancing Safety Act of 2020 became law, reauthorizing PHMSA for funding through 2023 and requiring, among other things, rulemaking to amend the integrity management program, emergency response plan, operation and maintenance manual, and pressure control recordkeeping requirements for gas distribution operators; to create new leak detection and repair program obligations; and to set new minimum federal safety standards for onshore gas gathering lines.

The DOT has delegated the implementation of pipeline safety requirements to PHMSA, which has adopted and enforces safety standards and procedures applicable to a limited number of our pipelines. In addition, many states, including the states in which we operate, have adopted regulations that are identical to or more restrictive than existing PHMSA regulations for intrastate pipelines. Among the regulations applicable to us, PHMSA requires pipeline operators to develop integrity management programs for certain pipelines located in high consequence areas, which include high-population areas such as the Dallas-Fort Worth greater metropolitan area where our DFW Midstream system is located. While the majority of our pipelines have historically met the DOT definition of gathering lines and were thus exempt from the integrity management requirements of PHMSA, we also operate a limited number of pipelines that are subject to the integrity management requirements. Those regulations require operators, including us, to:

•perform ongoing assessments of pipeline integrity;

•identify and characterize applicable threats to pipeline segments that could impact a high consequence area;

•maintain processes for data collection, integration and analysis;

•repair and remediate pipelines as necessary;

•adopt and maintain procedures, standards and training programs for control room operations; and

•implement preventive and mitigating actions.

In addition, PHMSA has taken recent action to regulate gathering systems, which includes integrity management requirements. In November 2021, PHMSA issued a final rule that extended pipeline safety requirements to onshore gas gathering pipelines. The rule requires all onshore gas gathering pipeline operators to comply with PHMSA’s incident and annual reporting requirements. It also extends existing pipeline safety requirements to a new category of gas gathering pipelines, “Type C” lines, which generally include high-pressure pipelines that are larger than 8.625 inches in diameter. Safety requirements applicable to Type C lines vary based on pipeline diameter and potential failure consequences. The final rule became effective in May 2022 and operators were required to comply with the applicable safety requirements by November 2022.

PHMSA has also imposed additional requirements on onshore gas transmission systems and hazardous liquids pipelines in recent years. In October 2019, the PHMSA issued three new final rules. One rule, which became effective in December 2019, establishes procedures to implement the expanded emergency order enforcement authority set forth in an October 2016 interim final rule. Among other things, this rule allows the PHMSA to issue an emergency order without advance notice or opportunity for a hearing. The other two rules, which became effective in July 2020, imposed several new requirements on operators of onshore gas transmission systems and hazardous liquids pipelines. The rule concerning gas transmission extended the requirement to conduct integrity assessments beyond “high consequence areas” (“HCAs”) to pipelines in “moderate consequence areas” (“MCAs”). It also included requirements to reconfirm Maximum Allowable Operating Pressure (“MAOP”), report MAOP exceedances, consider seismicity as a risk factor in integrity management, and use certain safety features on in-line inspection equipment. PHMSA modified the rule in July 2020, in response to a petition for reconsideration, to limit the rule’s recordkeeping requirement related to class location changes to gas transmission pipelines (not gas distribution pipelines) and to clarify that the rule’s reconfirmation requirements related to MAOP is limited to segments without traceable, verifiable and complete pressure test records. The rule concerning hazardous liquids extended the required use of leak detection systems beyond HCAs to all regulated non-gathering hazardous liquid pipelines, requires reporting for gravity fed lines and unregulated gathering lines, requires periodic inspection of all lines not in HCAs, calls for inspections of lines after extreme weather events, and added a requirement to make all lines in or affecting HCAs capable of accommodating in-line inspection tools over the next 20 years. In addition, in August 2022, PHMSA issued a final rule that established new or additional requirements for natural gas transmission lines related to the management of change process, integrity management, corrosion control standards, and pipeline inspections and repairs. In May 2023, PHMSA published a Notice of Proposed Rulemaking for regulatory amendments to reduce methane emissions from new and existing gas transmission, distribution, and regulated gas gathering pipelines with strengthened leakage survey and patrolling requirements, performance standards for advanced leak detection programs, leak grading and repair criteria with mandatory repair timelines, requirements for mitigation of emissions from blowdowns, pressure relief device design, configuration, and maintenance requirements, clarified requirements for investigating failures, and expanded reporting requirements.

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Gathering systems like ours are also subject to a number of other federal and state laws and regulations, including the Federal Occupational Safety and Health Act and comparable state statutes, the purposes of which are to protect the health and safety of workers, both generally and within the pipeline industry. In addition, the Occupational Safety and Health Administration hazard communication standard, EPA community right-to-know regulations under Title III of the federal Superfund Amendment and Reauthorization Act and comparable state statutes require that information be maintained concerning hazardous materials used or produced in our operations and that such information be provided to employees, state and local government authorities and the public.

Environmental Matters

General. Our operation of pipelines and other assets for the gathering, treating, transportation and/or processing of natural gas and the gathering of crude oil and produced water is subject to stringent and complex federal, state and local laws and regulations relating to the protection of the environment. As an owner or operator of these assets, we must comply with these laws and regulations at the federal, state and local levels. These laws and regulations can restrict or impact our business activities in many ways, such as:

•requiring the installation of pollution-control equipment or otherwise restricting the way we operate;

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

•delaying system modification or upgrades during permit reviews;

•requiring investigatory and remedial actions to mitigate pollution conditions caused by our operations or attributable to former operations; and

•enjoining the operations of facilities deemed to be in non-compliance with permits or permit requirements issued pursuant to or imposed by such environmental laws and regulations.

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

The trend in environmental regulation is to place more stringent requirements, resulting in more restrictions and limitations, on activities that may affect the environment. Thus, there can be no assurance as to the amount or timing of future expenditures for environmental compliance or remediation and actual future expenditures may be different from the amounts we currently anticipate. We try to anticipate future regulatory requirements that might be imposed and plan accordingly to remain in compliance with changing environmental laws and regulations and to minimize the costs of such compliance. We also actively participate in industry groups that help formulate recommendations for addressing existing and future regulations.

The following is a discussion of the material environmental laws and regulations that relate to our business.

Hazardous Substances and Waste. Our operations are subject to environmental laws and regulations relating to the management and release of solid and hazardous wastes and other substances, including hydrocarbons. These laws generally regulate the generation, storage, treatment, transportation and disposal of solid and hazardous waste and may impose strict joint and several liability for the investigation and remediation of affected areas where hazardous substances may have been released or disposed. Furthermore, the Toxic Substances Control Act and analogous state laws, impose requirements on the use, storage and disposal of various chemicals and chemical substances at our facilities. CERCLA and comparable state laws impose liability, without regard to fault or the legality of the original conduct, on certain classes of persons that contributed to the release of a hazardous substance into the environment. We may handle hazardous substances within the meaning of CERCLA, or similar state statutes, in the course of our ordinary operations and, as a result, may be jointly and severally liable under CERCLA for all or part of the costs required to clean up sites at which these hazardous substances have been released into the environment.

We also generate industrial wastes that are subject to the requirements of the RCRA and comparable state statutes. While the RCRA regulates both solid and hazardous wastes, it imposes strict requirements on the generation, storage, treatment, transportation and disposal of hazardous wastes. Although we generate minimal hazardous waste, it is possible that non-hazardous wastes, which could include wastes currently generated during our operations, will in the future be designated as hazardous wastes and, therefore, be subject to more rigorous and costly disposal requirements. Moreover, from time to time, the EPA and state regulatory agencies have considered the adoption of stricter disposal standards for non-hazardous wastes, including natural gas wastes and expansion of the definition of hazardous materials to include new substances, such as per- and polyfluoroalkyl substances (“PFAS”).

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We currently own or lease properties where hydrocarbons are being or have been handled for many years. Although we believe that the previous operators utilized operating and disposal practices that were standard in the industry at the time, hydrocarbons or other wastes may have been disposed of or released on or under the properties owned or leased by us or on or under the other locations where these hydrocarbons and wastes have been transported for treatment or disposal, without our knowledge. These properties and the wastes disposed thereon may be subject to CERCLA, the RCRA and analogous state laws. Under these laws, we could be required to remove or remediate previously disposed wastes (including wastes disposed of or released by prior owners or operators), to clean up contaminated property (including contaminated groundwater) or to perform remedial operations to prevent future contamination. We are not currently aware of any facts, events or conditions relating to such requirements that could materially impact our operations or financial condition.

Air Emissions. Our operations are subject to the federal CAA and comparable state and local laws and regulations. These laws and regulations regulate emissions of air pollutants from various industrial sources, including our facilities, and also impose various monitoring, control and reporting requirements. Such laws and regulations may require that we obtain pre-approval for the construction or modification of certain projects or facilities expected to produce or significantly increase air emissions, obtain and strictly comply with air permits containing various emissions and operational limitations and utilize specific emission control technologies to limit emissions. Our failure to comply with these requirements could subject us to monetary penalties, injunctions, conditions or restrictions on operations and criminal enforcement actions. Furthermore, we may be required to incur certain capital expenditures in the future to obtain and maintain operating permits and approvals for air pollutant emitting sources.

In October 2015, the EPA issued a new lower NAAQS for ozone. The previous ozone standard was set at 75 parts per billion (“ppb”). The revised standard has been lowered to 70 ppb. The lowered ozone NAAQS could subject us to increased regulatory burdens in the form of more stringent emission controls, emission offset requirements and increased permitting delays and costs. In October 2022, EPA reclassified the Dallas Fort Worth area as severe nonattainment under the 75 ppb standard and moderate nonattainment under the 70 ppb standard. As part of the same action, EPA also reclassified portions of Weld County, Colorado as severe nonattainment under the 75 ppb standard. In July 2022, EPA notified the State of Texas that it was considering redesignating an area comprising several Texas and New Mexico counties in the Permian Basin as a new ozone nonattainment area. These reclassifications and redesignations in areas where we operate could result in additional fees and more stringent permitting requirements for our operations, among other things. In addition, the EPA reviewed the 2015 70 ppb standard in 2020, but retained the standard without revision. However, EPA has announced that it will reconsider the 2020 decision to retain the 2015 standards. Future actions to lower the standard could similarly result in additional fees or more stringent permitting.

On June 3, 2016, the EPA finalized revisions to its 2012 New Source Performance Standard (“NSPS”) OOOO for the oil and gas industry, to reduce emissions of greenhouse gases - most notably methane - along with smog-forming VOCs. The revisions, which are published in the Federal Register under Subpart OOOOa, included the addition of methane to the pollutants covered by the rule, along with requirements for detecting and repairing leaks at gathering and boosting stations. Further, in November 2021, the EPA issued a new proposed rule targeting methane emissions from new and existing oil and gas sources. The proposed rule would: (1) update NSPS OOOOa; (2) adopt a new NSPS OOOOb for sources that commence construction, modification or reconstruction after the date the proposed rule is published in the Federal Register; and (3) adopt a new NSPS OOOOc to establish emissions guidelines, which will inform state plans to establish standards for existing sources. The EPA issued a supplemental proposal in November 2022 to update and expand the proposed NSPS OOOOb and OOOOc rules. This supplemental proposal would impose more stringent requirements and include sources not previously regulated under this source category. On December 2, 2023, during the United Nations Climate Change Conference in the United Arab Emirates (“COP28”), the EPA announced its final methane rules, which impose several new methane emission requirements on the oil and gas industry. These increasingly stringent requirements, or the application of new requirements to existing facilities, could result in additional restrictions on operations and increased compliance costs for us or our customers.

On November 16, 2016, the Bureau of Land Management (“BLM”) issued a final rule to reduce venting and flaring of natural gas on public and Indian lands. The final rule mirrored many of the requirements found in NSPS OOOOa, with additional natural gas royalty requirements for flared volumes at sites already connected to gas capture infrastructure. The rule was vacated by a Wyoming federal district judge in 2020. However, BLM proposed a new rule in November 2022, similarly designed to reduce the waste of natural gas from venting, flaring and leaks during oil and gas production activities on federal and Indian leases. While the rule, if finalized, is expected to have little or no direct impact on our operations, our customers that are primarily upstream wellhead operators may be impacted by the requirements in this rule.

In recent years, the EPA has also demonstrated an increased focus on CAA compliance for natural gas gathering operations. For example, in September 2019, the EPA issued an enforcement alert noting that EPA identified CAA noncompliance caused by unauthorized and/or excess emissions from depressurizing pig launchers and receivers in natural gas gathering operations. The alert discussed engineering, design, operations, and maintenance practices that EPA found that can cause noncompliance and summarizes engineering solutions to reduce emissions. This increased focus on natural gas gathering operations and any

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resulting enforcement actions by the EPA or state agencies could subject us to monetary penalties, injunctions, conditions or restrictions on operations.

Water Discharges. The CWA and analogous state laws impose restrictions and strict controls regarding the discharge of pollutants into regulated waters, which impacts our ability to conduct construction activities in waters and wetlands. Certain state regulations and the general permits issued under the Federal National Pollutant Discharge Elimination System program prohibit the discharge of pollutants and chemicals. In addition, the CWA and analogous state laws require individual permits or coverage under general permits for discharges of storm water runoff from certain types of facilities. These permits require us to control storm water runoff from some of our facilities. Some states also maintain groundwater protection programs that require permits for discharges or operations that may impact groundwater conditions. Federal and state regulatory agencies can impose administrative, civil and criminal penalties for non-compliance with discharge permits or other requirements of the CWA and analogous state laws and regulations. Except as otherwise disclosed in this annual report, we believe that we are in substantial compliance with all applicable requirements of the CWA and analogous state laws and regulations relating to water discharges.

Oil Pollution Control Act. The OPA requires the preparation of an SPCC plan for facilities engaged in drilling, producing, gathering, storing, processing, refining, transferring, distributing, using, or consuming oil and oil products, and which due to their location, could reasonably be expected to discharge oil in harmful quantities into or upon the navigable waters of the United States. The owner or operator of an SPCC-regulated facility is required to prepare a written, site-specific spill prevention plan, which details how a facility's operations comply with the requirements. To be in compliance, the facility's SPCC plan must satisfy all of the applicable requirements for drainage, bulk storage tanks, tank car and truck loading and unloading, transfer operations (intrafacility piping), inspections and records, security and training. Certain of our facilities are classified as SPCC-regulated facilities. We believe that they are in substantial compliance with all applicable requirements of OPA.

Hydraulic Fracturing. Hydraulic fracturing is an important practice that is used to stimulate production of natural gas and/or crude oil from dense subsurface rock formations, and is primarily regulated by state agencies. A number of states – such as Colorado, as discussed above – have adopted, and other states are considering adopting, legal requirements that could impose more stringent permitting, disclosure and well construction requirements on crude oil and/or natural gas drilling activities. For example, during the 2021-2022 election cycle, Colorado representatives proposed a ballot initiative to ban hydraulic fracturing on all non-federal land, but the proposed initiative failed to garner significant support. States also could elect to prohibit hydraulic fracturing altogether, as New York, Maryland, Oregon, and Vermont have done. In addition, certain local governments have adopted, and additional local governments may adopt, ordinances within their jurisdictions regulating the time, place and manner of drilling activities in general or hydraulic fracturing activities in particular. These initiatives and similar efforts in Colorado and elsewhere could restrict oil and gas development in the future.

The EPA has also moved forward with various regulatory actions, including a proposal to issue new regulations under the NSPS to expand and strengthen emissions reduction requirements under NSPS OOOOa for new, modified and reconstructed oil and natural gas sources, and require states to reduce methane emissions from existing sources nationwide. For further discussion of NSPS OOOOa and subsequent actions by the EPA, see the “Air Emissions” section above. The BLM has also asserted regulatory authority over aspects of the hydraulic fracturing process, and issued a final rule in March 2015 that established more stringent standards for performing hydraulic fracturing on federal and Indian lands, including requirements relating to well construction and integrity, handling of wastewater and chemical disclosure. However, in December 2017, the BLM published a final rule rescinding the 2015 rule. The U.S. District Court for the Northern District of California upheld the December 2017 rescission rule in a March 2020 decision, and the State of California and environmental plaintiffs appealed. The parties remain in settlement discussions.

Further, several federal governmental agencies (including the EPA) have conducted reviews and studies on the environmental aspects of hydraulic fracturing, including the EPA. The results of such reviews or studies could spur initiatives to further regulate hydraulic fracturing.

State and federal regulatory agencies have also focused on a possible connection between the hydraulic fracturing related activities and the increased occurrence of seismic activity. When caused by human activity, such events are called induced seismicity. Some state regulatory agencies, including those in Colorado, Ohio, and Texas, have modified their regulations or guidance to account for induced seismicity. These developments could result in additional regulation and restrictions on the use of injection disposal wells and hydraulic fracturing. Such regulations and restrictions could cause delays and impose additional costs and restrictions on our customers.

Additionally, certain of our customers produce oil and gas on federal lands. On January 20, 2021, the Acting Secretary for the Department of the Interior (“DOI”) signed an order effectively suspending new fossil fuel leasing and permitting on federal lands for 60 days. Then on January 27, 2021, President Biden issued an executive order indefinitely suspending new oil and natural gas leases on public lands or in offshore waters pending completion of a comprehensive review and reconsideration of federal oil and gas permitting and leasing practices. Several states filed lawsuits challenging the suspension, and on June 15, 2021, a judge in the U.S. District Court for the Western District of Louisiana issued a nationwide temporary injunction blocking

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the suspension. Although the injunction was subsequently overturned by the Court of Appeals for the Fifth Circuit, on remand the US District Court issued a permanent injunction as requested by the plaintiff states in August 2022. The Department of the Interior has since resumed leasing. In July 2023, DOI proposed updates to its onshore oil and gas leasing regulations which could further restrict oil and gas exploration and production on federal lands. DOI expects to issue a final rule in the spring of 2024. The Biden Administration continues to evaluate federal leasing and could impose additional restrictions in the future.

If new or more stringent federal, state or local legal restrictions relating to drilling activities or to the hydraulic fracturing process are adopted, this could result in a reduction in the supply of natural gas and/or crude oil that our customers produce, and could thereby adversely affect our revenues and results of operations. Compliance with such rules could also generally result in additional costs, including increased capital expenditures and operating costs, for our customers, which could ultimately decrease end-user demand for our services and could have a material adverse effect on our business.

Endangered Species Act. The Endangered Species Act restricts activities that may affect endangered or threatened species or their habitats. Some of our pipelines may be located in areas that are designated as habitats for endangered or threatened species.

National Environmental Policy Act. NEPA establishes a national environmental policy and goals for the protection, maintenance and enhancement of the environment and provides a process for implementing these goals within federal agencies. Major projects requiring federal permits or involving federal funding that have the potential to significantly impact the environment require review under NEPA. Many of our activities are covered under categorical exclusions which result in an expedited NEPA review process. Large upstream and downstream projects with significant cumulative impacts may be subject to longer NEPA review processes, which could impact the timing of those projects and our services associated with them.

Climate Change. The EPA has adopted regulations under the CAA that, among other things, establish GHG emission limits from motor vehicles as well as establish PSD construction and Title V operating permit reviews for certain large stationary sources that are potential major sources of GHG emissions. Facilities required to obtain PSD permits for their GHG emissions also will be required to meet “best available control technology” standards that will be established by the states or, in some cases, by the EPA on a case-by-case basis.

EPA rules also require the reporting of GHG emissions from specified large GHG-emitting sources in the United States, including onshore and offshore oil and natural gas systems. We are required to report under these rules for our assets that have GHG emissions above the reporting thresholds. In October 2015, the EPA issued revisions to Subpart W of the GHG reporting rule to include reporting requirements for gathering and booster stations, onshore natural gas transmission pipelines, and completions and workovers of oil wells with hydraulic fracturing. This development resulted in increased monitoring and reporting for our operations and for upstream producers for whom we provide midstream services. Further, the Inflation Reduction Act, signed into law in August 2022, includes a Methane Emissions Reduction Program to incentivize methane emission reductions and impose a fee on GHG emissions from certain oil and gas facilities.

In addition, almost half of the states, either individually or through multi-state regional initiatives, have begun to address GHG emissions, primarily through the planned development of emission inventories or regional GHG cap and trade programs. Most of these cap and trade programs work by requiring either major sources of emissions, such as electric power plants, or major producers of fuels, such as refineries and gas processing plants, to acquire and surrender emission allowances. In general, the number of allowances available for purchase is reduced each year until the overall GHG emission reduction goal is achieved. Depending on the scope of a particular program, we could be required to purchase and surrender allowances for GHG emissions resulting from our operations (e.g., at compressor stations). Although most of the state-level initiatives have to date been focused on large sources of GHG emissions, such as electric power plants, it is possible that certain components of our operations, such as our gas-fired compressors, could become subject to state-level GHG-related regulation.

Further, in December 2015, over 190 countries, including the United States, reached an agreement to reduce global GHG emissions. The agreement entered into force in November 2016 after over 70 countries, including the United States, ratified or otherwise consented to be bound by the agreement. In November 2019, the United States submitted formal notification to the United Nations that it intended to withdraw from the agreement. However, on January 20, 2021, President Biden signed an “Acceptance on Behalf of the United States of America” that reversed the prior withdrawal, and the United States officially rejoined the Paris Agreement on February 19, 2021. As part of rejoining the Paris Agreement, President Biden announced that the United States would commit to a 50 to 52 percent reduction from 2005 levels of GHG emissions by 2030 and set the goal of reaching net-zero GHG emissions by 2050. In November 2021, the Biden Administration expanded on this commitment and announced “The Long-Term Strategy of the United States: Pathways to Net-Zero Greenhouse Gas Emissions by 2050,” establishing a roadmap to net zero emissions in the United States by 2050 through, among other things, improvements in energy efficiency; decarbonization of energy sources via electricity, hydrogen, and sustainable biofuels; and reductions in non-CO2 GHG emissions, such as methane and nitrous oxide. These initiatives followed a series of executive orders by President Biden designed to address climate change. For example, the Executive Order on “Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis” called for new regulations and policies to address climate change and suspend,

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revise, or rescind, prior agency actions that were identified as conflicting with the Biden Administration’s climate policies. On December 13, 2023, COP28 issued its first global stocktake, which calls on parties, including the US, to contribute to transitioning away from fossil fuels, reduce methane emissions, and increase renewable energy capacity, amongst other things, to achieve net zero by 2050. While the stocktake agreement is not legally binding and has no enforcement mechanism, the US could pass further legislation based on the agreement. Reentry into the Paris Agreement, the related stocktake agreement, new legislation, or President Biden’s executive orders may result in the development of additional regulations or changes to existing regulations, which could have a material adverse effect on our business and that of our customers.

Legislation or regulations that may be adopted to address climate change could also affect the markets for our products, and those of our customers, by making our products more or less desirable than competing sources of energy. For example, the Inflation Reduction Act includes a variety of tax credits to incentivize the development and use of solar, wind, and other alternative energy sources while imposing several new requirements on oil and gas operators. Furthermore, a number of local governments across the country have banned or considered instituting bans on gas-fired appliances in newly constructed homes and other buildings, and federal agencies are considering more stringent safety or efficiency standards that could impact the availability of, access to or demand for gas-fired appliances. To the extent that our products are competing with higher GHG-emitting energy sources, our products would become more desirable in the market with more stringent limitations on GHG emissions. Conversely, to the extent that our products are competing with lower GHG-emitting energy sources such as solar and wind, our products would become less desirable in the market with more stringent limitations on GHG emissions.

Other Information

Human Capital Resources. We recognize that our continued ability to attract, retain and motivate exceptional employees is vital to ensuring our long-term competitive advantage and the ability to create value for our unitholders. Our employees are critical to our long-term success and are essential to helping us meet our goals. Among other things, we support and incentivize our employees in the following ways:

•Talent development, compensation and retention – We strive to provide our employees with a rewarding work environment, including the opportunity for success and a platform for personal and professional development. We provide a competitive benefits package designed to attract and retain a skilled and diverse workforce. We offer our employees a comprehensive benefits package, which includes company funded health plan options, vision and dental coverage, healthcare savings account, paid time off, parental leave and flexible spending accounts. We also provide professional training and development opportunities as well as education reimbursement. We also offer employees immediate eligibility in our 401(k) plan with company matching program.

•Health and safety – Employee health and safety in the workplace is one of our core values. Some of the ways in which we support the health and safety of our employees include wellness programs with incentives and employee assistance programs.

•Inclusion and diversity – We are committed to efforts to increase diversity and foster an inclusive work environment that supports our workforce.

As of December 31, 2023, the Partnership employed 244 people who provide direct, full-time support to our operations. None of our employees are covered by collective bargaining agreements, and we have not experienced any business interruption as a result of any labor disputes.

Availability of Reports. We make certain filings with the SEC, including, among other filings, this annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all amendments and exhibits to those reports, available free of charge through our website, www.summitmidstream.com, as soon as reasonably practicable after the date they are filed with, or furnished to, the SEC. We also post announcements, updates, events, investor information and presentations on our website in addition to copies of all recent news releases. We may use the Investors section of our website to communicate with investors. It is possible that the financial and other information posted there could be deemed to be material information. Documents and information on our website are not incorporated by reference herein. The SEC maintains a website that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC through the SEC’s website, http://www.sec.gov.

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Item 1A. Risk Factors.

You should carefully consider the following risk factors in addition to the other information included in this Annual Report. Each of these risk factors could adversely affect our business, operating results and financial condition, as well as adversely affect the value of an investment in our common units:

Risks Related to Our Operations

We are engaged in a strategic review process, which may pose additional risks to our business, and there can be no assurance as to its outcome.

We announced that our Board of Directors has engaged external advisors to evaluate strategic alternatives for the Partnership with the goal of maximizing value for its unitholders. These alternatives may include, but are not limited to, continued execution of the Partnership’s business plan, sale of assets, refinancing parts or the entirety of its capital structure, sale of the Partnership by merger or cash, or any combination of these and other alternatives. Our exploration of strategic alternatives, including any uncertainty created by this process, involves a number of risks: significant fluctuations in our unit price could occur in response to developments relating to the strategic review process or market speculation regarding any such developments; we may encounter difficulties in hiring, retaining and motivating key personnel during this process or as a result of uncertainties generated by this process or any developments or actions relating to it; we may be involved in future litigation; we may incur substantial increases in general and administrative expense associated with increased legal fees and the need to retain and compensate third-party advisors; and we may experience difficulties in preserving the commercially sensitive information that may need to be disclosed to third parties during this process or in connection with an assessment of our strategic alternatives. The strategic review process also requires significant time and attention from management, which could distract them from other tasks in operating our business.

There can be no assurance that this process will result in the consummation of any strategic transaction. If our Board of Directors decides to proceed with a strategic transaction, it may not be at a price that our investors view as attractive relative to the value of our standalone business. Additionally, the closing of any such transaction would be dependent upon a number of factors that may be beyond our control, including, among other factors, market conditions, regulatory factors, industry trends, the interest of third parties in our business and the availability of financing to potential buyers on reasonable terms. If our Board of Directors decides not to proceed with a strategic transaction, this could have a negative effect on the market price and volatility of our common units. The occurrence of any one or more of the above risks could have a material adverse impact on our business, financial condition, results of operations and cash flows.

We may not have sufficient cash from operations following the establishment of cash reserves and payment of fees and expenses, to enable us to pay distributions to holders of our preferred units and common units.

We may not have sufficient available cash from operating surplus each quarter to pay the distributions to holders of our preferred units and common units. We have not made a distribution on our common units or Series A Preferred Units since we announced suspension of those distributions on May 3, 2020. Because our Series A Preferred Units rank senior to our common units with respect to distribution rights, any accrued amounts on our Series A Preferred Units must first be paid prior to our resumption of distributions to our common unitholders. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units totaled $33.0 million.

Further, absent a material change to our business, we do not expect to pay distributions on the common units or Series A Preferred Units in the foreseeable future, and there are restrictions on our ability to pay distributions under our outstanding indebtedness that restrict our ability to pay cash distributions on any of our equity securities. We intend to use our cash flow to reduce debt and invest in our business.

The amount of cash we can distribute on our units principally depends upon the amount of cash we generate from our operations, which will fluctuate from quarter to quarter based on, among other things:

•the volumes we gather, transport, treat and process;

•the level of production of natural gas and crude oil (and associated volumes of produced water) from wells connected to our gathering systems, which is dependent in part on the demand for, and the market prices of, crude oil, natural gas and NGLs;

•damage to pipelines, facilities, related equipment and surrounding properties caused by earthquakes, floods, fires, severe weather, explosions and other natural disasters, accidents and acts of terrorism;

•leaks or accidental releases of hazardous materials into the environment;

•weather conditions and seasonal trends;

•changes in the fees we charge for our services;

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•changes in contractual MVCs and our customer’s capacity to make MVC shortfall payments when due;

•the level of competition from other midstream energy companies in our areas of operation;

•changes in the level of our operating, maintenance and general and administrative expenses;

•regulatory action affecting the supply of, or demand for, crude oil, natural gas and NGLs, the fees we can charge, how we contract for services, our existing contracts, our operating and maintenance costs or our operating flexibility;

•adverse economic impacts from the COVID-19 pandemic or other epidemics, including disruptions in demand for oil, natural gas and other petroleum products, supply chain disruptions, and decreased productivity resulting from illness, travel restrictions, quarantine, or government mandates; and

•prevailing economic and market conditions.

In addition, the actual amount of cash we have available for distribution to our common unitholders depends on other factors, some of which are beyond our control, including:

•the level and timing of capital expenditures we make;

•the level of our operating, maintenance and general and administrative expenses;

•the cost of acquisitions, if any;

•our ability to sell assets, if any, and the price that we may receive for such assets;

•our debt service requirements and other liabilities;

•fluctuations in our working capital needs;

•our ability to borrow funds and access the debt and equity capital markets;

•restrictions contained in our debt agreements;

•the amount of cash reserves established by our General Partner;

•not receiving anticipated shortfall payments from our customers;

•adverse legal judgments, fines and settlements;

•distributions paid on our Series A Preferred Units, if any, or on the preferred stock of our subsidiaries, including our Subsidiary Series A Preferred Units; and

•other business risks affecting our cash levels.

We depend on a relatively small number of customers for a significant portion of our revenues. For example, Caerus, a customer in our Piceance segment accounts for over 10% of our consolidated revenue. The loss of, or material nonpayment or nonperformance by, or the curtailment of production by, any one or more of our customers could materially adversely affect our revenues, cash flows and results of operations.

Certain of our customers may have material financial and liquidity issues or may, as a result of operational incidents or other events, be disproportionately affected as compared to larger, better-capitalized companies. Any material nonpayment or nonperformance by any of our customers could have a material adverse effect on our revenues, cash flows and results of operations. We expect our exposure to concentrated risk of nonpayment or nonperformance to continue as long as we remain substantially dependent on a relatively small number of customers for a significant portion of our revenues.

If any of our customers curtail or reduce production in our areas of operation, it could reduce throughput on our systems and, therefore, materially adversely affect our revenues, cash flows and results of operations.

Further, we are subject to the risk of non-payment or non-performance by our larger customers. We cannot predict the extent to which our customers’ businesses would be impacted if conditions in the energy industry deteriorate, nor can we estimate the impact such conditions would have on any of our customers’ abilities to execute their drilling and development programs or perform under our gathering and processing agreements. An extended low commodity price environment negatively impacts natural gas producers causing some producers in the industry significant economic stress, including, in certain cases, to file for bankruptcy protection or to renegotiate contracts. To the extent that any customer is in financial distress or commences bankruptcy proceedings, contracts with these customers may be subject to renegotiation or rejection under applicable provisions of the United States Bankruptcy Code. Any material non-payment or non-performance by our customers could adversely affect our business and operating results.

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We are exposed to the creditworthiness and performance of our customers, suppliers and contract counterparties and any material nonpayment or nonperformance by one or more of these parties could materially adversely affect our financial and operating results.

Although we attempt to assess the creditworthiness and associated liquidity of our customers, suppliers and contract counterparties, there can be no assurance that our assessments will be accurate or that there will not be a rapid or unanticipated deterioration in their creditworthiness, which may have an adverse impact on our business, results of operations, financial condition and cash flows. In addition, there can be no assurance that our contract counterparties will perform or adhere to existing or future contractual arrangements, including making any required shortfall payments or other payments due under their respective contracts.

The policies and procedures we use to manage our exposure to credit risk, such as credit analysis, credit monitoring and, if necessary, requiring credit support, cannot fully eliminate counterparty credit risks. To the extent our policies and procedures prove to be inadequate, our financial and operational results may be negatively impacted.

Some of our counterparties may be highly leveraged, have limited financial resources and/or have recently experienced a rating agency downgrade and will be subject to their own operating and regulatory risks. Even if our credit review and analysis mechanisms work properly, we may experience financial losses in our dealings with such parties. In addition, volatility in commodity prices could have a negative impact on our counterparties, which, in turn, could have a negative impact on their ability to meet their obligations to us.

Any material nonpayment or nonperformance by any of our counterparties or suppliers could require us to pursue substitute counterparties or suppliers for the affected operations or reduce our operations. There can be no assurance that any such efforts would be successful or would provide similar financial and operational results.

Significant prolonged weakness in natural gas, NGL and crude oil prices could reduce throughput on our systems and materially adversely affect our revenues and results of operations.

Lower natural gas, NGL and crude oil prices could negatively impact exploration, development and production of natural gas and crude oil, thereby resulting in reduced throughput on our gathering systems. If natural gas, NGL and/or crude oil prices decrease, it could cause sustained reductions in exploration or production activity in our areas of operation and result in a further reduction in throughput on our systems, which could have a material adverse effect on our business, financial condition, results of operations and cash flows. In the latter half of 2022 and the first half of 2023, the Henry Hub Natural Gas Spot Price declined from a monthly average of $8.81 per MMBtu in August 2022 to a monthly average of $2.18 per MMBtu in June 2023, before rising slightly in the second half of 2023 to close the year at $2.58 per MMBtu on December 29, 2023. As of January 31, 2024, Henry Hub 12-month strip pricing closed at $2.10 per MMBtu. Cushing, Oklahoma West Texas Intermediate crude oil spot prices similarly trended down in the latter half of 2022 through early 2023, from a monthly average of $114.84 per barrel in June 2022 to a monthly average of $70.25 per barrel in June 2023, closing the year at $71.89 per barrel on December 29, 2023. As of January 31, 2024, West Texas Intermediate 12-month strip pricing closed at $75.85 per barrel.

Because of the natural decline in production from our customers' existing wells, our success depends in part on our customers replacing declining production and also on our ability to maintain levels of throughput on our systems. Any decrease in the volumes that we gather and process could materially adversely affect our business and operating results.

The customer volumes that support our business depend on the level of production from natural gas and crude oil wells connected to our systems, the production from which may be less than expected and will naturally decline over time. As a result, our cash flows associated with these wells will also decline over time. To maintain or increase throughput levels on our systems, we must obtain new sources of volume throughput. The primary factors affecting our ability to obtain new sources of volume throughput include (i) the level of successful drilling activity in our areas of operation and (ii) our ability to compete for new volumes on our systems.

We have no control over the level of drilling activity in our areas of operation, the amount of reserves associated with wells connected to our systems or the rate at which production from a well declines. In addition, we have no control over producers or their drilling and production decisions, which are affected by, among other things:

•the availability and cost of capital;

•prevailing and projected hydrocarbon commodity prices;

•demand for crude oil, natural gas and other hydrocarbon products, including NGLs;

•levels of reserves;

•geological considerations;

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•environmental or other governmental regulations, including the availability of drilling permits and the regulation of hydraulic fracturing; and

•the availability of drilling rigs and other costs of production and equipment.

Fluctuations in energy prices can also greatly affect the development of new crude oil and natural gas reserves. Drilling and production activities generally decrease as commodity prices decrease. In general terms, the prices of crude oil, natural gas and other hydrocarbon products fluctuate in response to changes in supply and demand, market uncertainty and a variety of additional factors that are beyond our control. These factors include:

•worldwide economic and geopolitical conditions;

•global or national health concerns, including the outbreak of pandemic or contagious disease, such as COVID-19, which may reduce demand for crude oil, natural gas and NGLs because of reduced global or national economic activity;

•weather conditions and seasonal trends;

•the levels of domestic production and consumer demand;

•the availability of imported liquefied natural gas (“LNG”);

•the ability to export LNG;

•the availability of transportation and storage systems with adequate capacity;

•the volatility and uncertainty of regional pricing differentials and premiums;

•the price and availability of alternative fuels, including alternative fuels that benefit from government subsidies;

•the effect of energy conservation measures;

•the cost and availability of alternative energy sources;

•the nature and extent of governmental regulation and taxation; and

•the anticipated future prices of crude oil, natural gas and other hydrocarbon products, including NGLs.

Because of these factors, even if new crude oil or natural gas reserves are known to exist in areas served by our assets, producers may choose not to develop those reserves. If reductions in drilling activity result in our inability to maintain the current levels of throughput on our systems, those reductions could reduce our revenues and cash flows and materially adversely affect our results of operations.

In addition, it may be more difficult to maintain or increase the current volumes on our gathering systems, as several of the formations in the unconventional resource plays in which we operate generally have higher initial production rates and steeper production decline curves than wells in more conventional basins and may have steeper production decline curves than initially anticipated. Should we determine that the economics of our gathering, treating, transportation and processing assets do not justify the capital expenditures needed to grow or maintain volumes associated therewith, revenues associated with these assets will decline over time. In addition to capital expenditures to support growth, the steeper production decline curves associated with unconventional resource plays may require us to incur higher maintenance capital expenditures over time, which will reduce our cash available for distribution.

Many of our costs are fixed and do not vary with our throughput. These costs will not decline ratably or at all should we experience a reduction in throughput, which could result in a decline in our revenues and cash flows and materially adversely affect our results of operations and financial condition.

If our customers do not increase the volumes they provide to our gathering systems, our results of operations and financial condition may be materially adversely affected.

If we are unsuccessful in attracting new customers and/or new gathering opportunities with existing customers, our results of operations will be impaired. Our customers are not obligated to provide additional volumes to our gathering systems, and they may determine in the future that drilling activities in areas outside of our current areas of operation are strategically more attractive to them. Reductions by our customers in our areas of mutual interest could result in reductions in throughput on our systems and materially adversely impact our results of operations and financial condition.

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Certain of our gathering and processing agreements contain provisions that can reduce the cash flow stability that the agreements were designed to achieve.

We designed those gathering and processing agreements that contain MVC provisions to generate stable cash flows for us over the life of the MVC contract term while also minimizing our direct commodity price risk. Under certain of these MVCs, our customers agree to ship a minimum volume on our gathering systems or send a minimum volume to our processing plants or, in some cases, to pay a minimum monetary amount, over certain periods during the term of the MVC. In addition, our gathering and processing agreements may also include an aggregate MVC, which represents the total amount that the customer must flow on our gathering system or send to our processing plants (or an equivalent monetary amount) over the MVC term. If such customer’s actual throughput volumes are less than its MVC for the contracted measurement period, it must make a shortfall payment to us at the end of the applicable measurement period. The amount of the shortfall payment is based on the difference between the actual throughput volume shipped or processed for the applicable period and the MVC for the applicable period, multiplied by the applicable fee. To the extent that a customer’s actual throughput volumes are above or below its MVC for the applicable contracted measurement period, certain of our gathering agreements contain provisions that allow the customer to use the excess volumes or the shortfall payment to credit against future excess volumes or future shortfall payments, which could have a material adverse effect on our results of operations, financial condition and cash flows.

We have not obtained independent evaluations of all of the reserves connected to our gathering systems; therefore, in the future, customer volumes on our systems could be less than we anticipate.

We do not routinely obtain or update independent evaluations of the reserves connected to our systems. Moreover, even if we did obtain independent evaluations of all of the reserves connected to our systems, such evaluations may prove to be incorrect. Crude oil and natural gas reserve engineering requires subjective estimates of underground accumulations of crude oil and natural gas and assumptions concerning future crude oil and natural gas prices, future production levels and operating and development costs.

Accordingly, we may not have accurate estimates of total reserves dedicated to our systems or the anticipated life of such reserves. If the total reserves or estimated life of the reserves connected to our gathering systems are less than we anticipate and we are unable to secure additional volumes, it could have a material adverse effect on our business, results of operations and financial condition.

Our industry is highly competitive, and increased competitive pressure could materially adversely affect our business and operating results.

We compete with other midstream companies in our areas of operations, some of which are large companies that have greater financial, managerial and other resources than we do. In addition, some of our competitors may have assets in closer proximity to natural gas and crude oil supplies and may have available idle capacity in existing assets that would not require new capital investments for use. Our competitors may expand or construct gathering systems that would create additional competition for the services we provide to our customers. Because our customers do not have leases that cover the entirety of our areas of mutual interest, non-customer producers that lease acreage within any of our areas of mutual interest may choose to use one of our competitors for their gathering and/or processing service needs.

In addition, our customers may develop their own gathering systems outside of our areas of mutual interest. Our ability to renew or replace existing contracts with our customers at rates sufficient to maintain current revenues and cash flows could be materially adversely affected by the activities of our competitors and our customers. All of these competitive pressures could have a material adverse effect on our business, results of operations and financial condition.

We may not be able to renew or replace expiring contracts at favorable rates or on a long-term basis.

Our gathering, treating, transportation and processing contracts have terms of various durations. As these contracts expire, we may have to negotiate extensions or renewals with existing customers or enter into new contracts with other customers. We may be unable to obtain new contracts on favorable commercial terms, if at all. We also may be unable to maintain the economic structure of a particular contract with an existing customer or the overall mix of our contract portfolio. Moreover, we may be unable to obtain areas of mutual interest from new customers in the future, and we may be unable to renew existing areas of mutual interest with current customers as and when they expire. The extension or replacement of existing contracts depends on a number of factors beyond our control, including:

•the level of existing and new competition to provide gathering and/or processing services in our areas of operation;

•the macroeconomic factors affecting gathering, treating, transporting and processing economics for our current and potential customers;

•the balance of supply and demand, on a short-term, seasonal and long-term basis, in our markets;

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•the extent to which the customers in our areas of operation are willing to contract on a long-term basis; and

•the effects of federal, state or local regulations on the contracting practices of our customers.

To the extent we are unable to renew our existing contracts on terms that are favorable to us or successfully manage our overall contract mix over time, our revenues and cash flows could decline.

If third-party pipelines or other midstream facilities interconnected to our gathering systems become partially or fully unavailable, our revenues and cash flows could be materially adversely affected.

Our gathering systems connect to third-party pipelines and other midstream facilities, such as processing plants, rail terminals and produced water disposal facilities. The continuing operation of such third-party pipelines and other midstream facilities is not within our control. These pipelines and other midstream facilities may become unavailable due to issues including, but not limited to, testing, turnarounds, line repair, reduced operating pressure, lack of operating capacity, regulatory requirements, curtailments of receipt or deliveries due to insufficient capacity or because of damage from other hazards. In addition, we do not have interconnect agreements with all of these pipelines and other facilities and the agreements we do have may be terminated in certain circumstances and/or on short notice. If any of these pipelines or other midstream facilities become unavailable for any reason, or, if these third parties are otherwise unwilling to receive or transport the natural gas, crude oil and produced water that we gather and/or process, our revenues, cash flows and results of operations could be materially adversely affected.

Crude oil and natural gas production and gathering may be adversely affected by weather conditions and terrain, which in turn could negatively impact the operations of our gathering, treating, transportation and processing facilities and our construction of additional facilities.

Extended periods of below freezing weather and unseasonably wet weather conditions, especially in North Dakota, Colorado, Ohio, Texas and West Virginia, can be severe and can adversely affect crude oil and natural gas operations due to the potential shut-in of producing wells or decreased drilling activities. These types of interruptions could result in a decrease in the volumes supplied to our gathering systems. Further, delays and shutdowns caused by severe weather may have a material negative impact on the continuous operations of our gathering, treating, transporting and processing systems, including interruptions in service. These types of interruptions could negatively impact our ability to meet our contractual obligations to our customers and thereby give rise to certain termination rights and/or the release of dedicated acreage. Any resulting terminations or releases could materially adversely affect our business and results of operations.

We also may be required to incur additional costs and expenses in connection with the design and installation of our facilities due to their locations and surrounding terrain. We may be required to install additional facilities, incur additional capital and operating expenditures, or experience interruptions in or impairments of our operations to the extent that the facilities are not designed or installed correctly. For example, certain of our pipeline facilities are located in mountainous areas such as our Utica Shale and Marcellus Shale operations, which may require specially designed facilities and special installation considerations. If such facilities are not designed or installed correctly, do not perform as intended, or fail, we may be required to incur significant expenditures to correct or repair the deficiencies, or may incur significant damages to or loss of facilities, and our operations may be interrupted as a result of deficiencies or failures. In addition, such deficiencies may cause damage to the surrounding environment, including slope failures, stream impacts and other natural resource damages, and we may as a result also be subject to increased operating expenses or environmental penalties and fines.

Interruptions in operations at any of our facilities may adversely affect our operations and cash flows available for distribution to our unitholders.

Our operations depend upon the infrastructure that we have developed and constructed. Any significant interruption at any of our gathering, treating, transporting or processing facilities, or in our ability to provide gathering, treating, transporting or processing services, could adversely affect our operations and cash flows available for distribution to our unitholders. Operations at our facilities could be partially or completely shut down, temporarily or permanently, as the result of circumstances not within our control, such as:

•unscheduled turnarounds or catastrophic events at our physical plants or pipeline facilities;

•restrictions imposed by governmental authorities or court proceedings;

•labor difficulties that result in a work stoppage or slowdown;

•a disruption in the supply of resources necessary to operate our midstream facilities;

•damage to our facilities resulting from production volumes that do not comply with applicable specifications; and

•inadequate transportation and/or market access to support production volumes, including lack of pipeline, rail terminals, produced water disposal facilities and/or third-party processing capacity.

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Any significant interruption at any of our gathering, treating, transporting or processing facilities, or in our ability to provide gathering, treating, transporting or processing services, could adversely affect our operations and cash flows available for distribution to our unitholders.

Our business involves many hazards and operational risks, some of which may not be fully covered by insurance. If a significant incident or event occurs for which we are not adequately insured or if we fail to recover all anticipated insurance proceeds for significant incidents or events for which we are insured, our operations and financial results could be materially adversely affected.

Our operations are subject to all of the risks and hazards inherent in the operation of gathering, treating, transporting and processing systems, including:

•damage to pipelines, processing plants, compression assets, related equipment and surrounding properties caused by tornadoes, floods, freezes, fires and other natural disasters and acts of terrorism;

•inadvertent damage from construction, vehicles, farm and utility equipment;

•leaks or losses resulting from the malfunction of equipment or facilities;

•ruptures, fires and explosions; and

•other hazards that could also result in personal injury and loss of life, pollution and suspension of operations.

These risks could result in substantial losses due to personal injury and/or loss of life, severe damage to and destruction of property and equipment and pollution or other environmental damage. The location of certain of our systems in or near populated areas, including residential areas, commercial business centers and industrial sites, could increase the damages resulting from such events.

These events may also result in the curtailment or suspension of our operations. A natural disaster or any event such as those described above affecting the areas in which we and our customers operate could have a material adverse effect on our operations. Accidents or other operating risks could further result in loss of service available to our customers. Such circumstances, including those arising from maintenance and repair activities, could result in service interruptions on portions or all of our gathering systems. Potential customer impacts arising from service interruptions on segments of our gathering systems could include limitations on our ability to satisfy customer requirements, obligations to temporarily waive MVCs during times of constrained capacity, temporary or permanent release of production dedications, and solicitation of existing customers by others for potential new projects that would compete directly with our existing services. Such circumstances could materially adversely impact our ability to meet contractual obligations and retain customers, with a resulting negative impact on our business and results of operations.

Although we have a range of insurance programs providing varying levels of protection for public liability, damage to property, loss of income and certain environmental hazards, we may not be insured against all causes of loss, claims or damage that may occur. If a significant incident or event occurs for which we are not fully insured, it could materially adversely affect our operations and financial condition. Furthermore, we may not be able to maintain or obtain insurance of the type and amount we desire at reasonable rates. As a result of industry or market conditions, including any reluctance by insurance companies to insure oil and gas operations for political or other reasons, premiums and deductibles for certain of our insurance policies may substantially increase. In some instances, certain insurance could become unavailable or available only for reduced amounts of coverage. Additionally, with regard to the assets we have acquired, we have limited indemnification rights to recover from the seller of the assets in the event of any potential environmental liabilities.

We may fail to successfully integrate gathering system acquisitions into our existing business in a timely manner, which could have a material adverse effect on our business, results of operations, and financial condition, or fail to realize all of the expected benefits of the acquisitions, which could negatively impact our future results of operations.

Integration of gathering system acquisitions, such as the 2022 DJ Acquisitions, can be a complex, time-consuming and costly process, particularly if the acquired assets significantly increase our size and/or (i) diversify the geographic areas in which we operate or (ii) the service offerings that we provide.

The failure to successfully integrate the acquired assets with our existing business in a timely manner may have a material adverse effect on our business, results of operations and financial condition. If any of the risks described above or in the immediately preceding risk factor or unanticipated liabilities or costs were to materialize with respect to future acquisitions or if the acquired assets were to perform at levels below the forecasts we used to evaluate them, then the anticipated benefits from the acquisition may not be fully realized, if at all, and our future results of operations and financial condition could be negatively impacted.

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Our construction of new assets may not result in revenue increases and will be subject to regulatory, environmental, political, legal and economic risks, which could materially adversely affect our results of operations and financial condition.

The construction of new assets, including for example, the Double E Pipeline, which was placed into service in November 2021, involve numerous regulatory, environmental, political, legal and economic uncertainties that are beyond our control.

Such construction projects may also require the expenditure of significant amounts of capital and financing, traditional or otherwise, that may not be available on economically acceptable terms or at all. If we undertake these projects, our revenue may not increase immediately upon the expenditure of funds for a particular project and they may not be completed on schedule, at the budgeted cost, or at all.

Moreover, we could construct facilities to capture anticipated future production growth in a region where such growth does not materialize or only materializes over a period materially longer than expected. To the extent we rely on estimates of future production in our decision to construct additions to our systems, such estimates may prove to be inaccurate due to the numerous uncertainties inherent in estimating quantities of future production. As a result, new facilities may not attract enough throughput to achieve our expected investment return, which could materially adversely affect our results of operations and financial condition.

In addition, the construction of additions or modifications to our existing gathering, treating, transporting and processing assets and the construction of new midstream assets may require us to obtain federal, state and local regulatory environmental or other authorizations. The approval process for gathering, treating, transporting and processing activities has become increasingly challenging, due in part to state and local concerns related to unregulated exploration and production and gathering, treating, transporting and processing activities in new production areas. Such authorization may not be granted or, if granted, such authorization may include burdensome or expensive conditions. As a result, we may be unable to obtain such authorizations and may, therefore, be unable to connect new volumes to our systems or capitalize on other attractive expansion opportunities. A future government shutdown could delay the receipt of any federal regulatory approvals. Additionally, it may become more expensive for us to obtain authorizations or to renew existing authorizations. If the cost of renewing or obtaining new authorizations increases materially, our cash flows could be materially adversely affected.

We do not own all of the land on which our pipelines and facilities are located, which could result in disruptions to our operations.

We do not own all of the land on which our pipelines and facilities have been constructed, and we are, therefore, subject to the possibility of more onerous terms and/or increased costs to retain necessary land use if we do not have valid rights-of-way or if such rights-of-way lapse or terminate or if our pipelines are not properly located within the boundaries of such rights-of-way. We obtain the rights to construct and operate our pipelines on land owned by third parties and governmental agencies either perpetually or for a specific period of time. If we were to be unsuccessful in renegotiating rights-of-way, we might have to relocate our facilities. Our loss of these rights, through our inability to renew right-of-way contracts or otherwise, could have a material adverse effect on our business, results of operations and financial condition.

Our ability to operate our business effectively could be impaired if we fail to attract and retain key personnel, and a shortage of skilled labor in the midstream energy industry could reduce employee productivity and increase costs, which could have a material adverse effect on our business and results of operations.

Our ability to operate our business and implement our strategies depends on our continued ability to attract and retain highly skilled personnel with midstream energy industry experience and competition for these persons in the midstream energy industry is intense. Given our size, we may be at a disadvantage, relative to our larger competitors, in the competition for these personnel. We may not be able to continue to employ our senior executives and key personnel or attract and retain qualified personnel in the future, and our failure to retain or attract our senior executives and key personnel could have a material adverse effect on our ability to effectively operate our business.

Furthermore, as a result of labor shortages we have experienced difficulty in recruiting and hiring skilled labor throughout our organization. The operation of gathering, treating, transporting and processing systems requires skilled laborers in multiple disciplines such as equipment operators, mechanics and engineers, among others. If we continue to experience shortages of skilled labor in the future, our labor and overall productivity or costs could be materially adversely affected. If our labor prices increase or if we experience materially increased health and benefit costs with respect to our General Partner's employees, our business and results of operations could be materially adversely affected.

A transition from hydrocarbon energy sources to alternative energy sources could lead to changes in demand, technology and public sentiment which could have material adverse effects on our business and results of operations.

Increased public attention on climate change and corresponding changes in consumer, commercial and industrial preferences and behavior regarding energy use and generation may result in:

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•technological advances with respect to the generation, transmission, storage and consumption of energy (including advances in wind, solar and hydrogen power, as well as battery technology);

•increased availability of, and increased demand from consumers and industry for, energy sources other than crude oil and natural gas (including wind, solar, nuclear, and geothermal sources as well as electric vehicles); and

•development of, and increased demand from consumers and industry for, lower-emission products and services (including electric vehicles and renewable residential and commercial power supplies) as well as more efficient products and services.

Such developments relating to a transition from oil and gas to alternative energy sources and a lower-carbon economy may reduce the demand for natural gas and crude oil and other products made from hydrocarbons. For example, in November 2023, the international community, including over 150 governments, gathered in Dubai at COP28 and announced a new climate deal that calls on countries to ratchet up action on climate, and, on December 13, 2023, COP28 issued its first global stocktake, which calls on parties, including the US, to contribute to transitioning away from fossil fuels, reduce methane emissions, and increase renewable energy capacity, amongst other things, to achieve net zero by 2050. Any significant decrease in the demand for natural gas and crude oil resulting from such developments could reduce the volumes of natural gas and crude oil that we gather and process, which could adversely affect our business and operating results.

Furthermore, if any such developments reduce the desirability of participating in the midstream oil and gas industry, then such developments could also reduce the availability to us of necessary third-party services or facilities that we rely on, which could increase our operational costs and have an adverse effect on our business and results of operations.

Such developments and accompanying societal expectations on companies to address climate change, investor and societal expectations regarding voluntary ESG initiatives and disclosures could, among other things, increase costs related to compliance and stakeholder engagement, increase reputational risk and negatively impact our access to and cost of accessing capital. For example, some prominent investors have announced their intention to no longer invest in the oil and gas sector, citing climate change concerns. If other financial institutions and investors refuse to invest in or provide capital to the oil and gas sector in the future because of these reputational risks, that could result in capital being unavailable to us, or only at significantly increased cost.

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Risks Related to Our Finances

Limited access to and/or availability of the commercial bank market or debt and equity capital markets could impair our ability to grow or cause us to be unable to meet future capital requirements.

To expand our asset base, whether through acquisitions or organic growth, we will need to make expansion capital expenditures. We also frequently consider and enter into discussions with third parties regarding potential acquisitions. In addition, the terms of certain of our gathering and processing agreements also require us to spend significant amounts of capital, over a short period of time, to construct and develop additional midstream assets to support our customers' development projects. Depending on our customers' future development plans, it is possible that the capital required to construct and develop such assets could exceed our ability to finance those expenditures using our cash reserves or available capacity under the ABL Facility or the Permian Transmission Credit Facilities.

We plan to use cash from operations, incur borrowings and/or sell additional common units or other securities to fund our future expansion capital expenditures. Using cash from operations to fund expansion capital expenditures will directly reduce any cash available for distribution to unitholders, if any. Our ability to obtain financing or to access the capital markets for future debt or equity offerings may be limited by (i) our financial condition at the time of any such financing or offering, (ii) covenants in our debt agreements, (iii) restrictions imposed by our Series A Preferred Units, (iv) general economic conditions and contingencies, (v) increasing disfavor among many investors towards investments in fossil fuel companies and (vi) general weakness in the debt and equity capital markets and other uncertainties that are beyond our control, including political uncertainty in the U.S. (including the ongoing debates related to the U.S. federal government budget), volatility and disruption in global capital and credit markets (including those resulting from geopolitical events, such as the Russian invasion of Ukraine or the continued conflict in the Middle East), uncertainty regarding increases or decreases in interest rates resulting from changes in the federal funds rate range targeted by the Federal Reserve, pandemics, epidemics and other outbreaks, such as COVID-19, or other adverse developments that affect financial institutions. In addition, lenders are facing increasing pressure to curtail their lending activities to companies in the oil and natural gas industry. Furthermore, market demand for equity issued by master limited partnerships has been significantly lower in recent years than it has been historically, which may make it more challenging for us to finance our expansion capital expenditures and acquisition capital expenditures with the issuance of additional equity.

We have not made a distribution on our common units or Series A Preferred Units since we announced suspension of those distributions on May 3, 2020, and these suspensions of distributions may further reduce demand for our common units or Series A Preferred Units. Because our Series A Preferred Units rank senior to our common units with respect to distribution rights, any accrued amounts on our Series A Preferred Units must first be paid prior to our resumption of distributions to our common unitholders. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units totaled $33.0 million. Further, absent a material change to our business, we do not expect to pay distributions on the common units or Series A Preferred Units in the foreseeable future. Additionally, there are restrictions on our ability to pay distributions under our outstanding indebtedness that restrict our ability to pay cash distributions on any of our equity securities. As such, if we are unable to raise expansion capital, we may lose the opportunity to make acquisitions, pursue new organic development projects, or to gather, treat and process new production volumes from our customers with whom we have agreed to construct and develop midstream assets in the future. Even if we are successful in obtaining external funds for expansion capital expenditures through the capital markets, the terms thereof could limit our ability to pay distributions to our common unitholders. In addition, incurring additional debt may significantly increase our interest expense and financial leverage, and issuing additional units representing limited partner interests may result in significant common unitholder dilution and increase the aggregate amount of cash required to pay distributions to our unitholders, which could materially decrease our ability to pay such distributions.

We have a significant amount of indebtedness. Our leverage and debt service obligations may adversely affect our financial condition, results of operations and business prospects, and may limit our flexibility to obtain financing and to pursue other business opportunities.

At December 31, 2023, we had $1.5 billion of indebtedness outstanding, and the unused portion of the ABL Facility totaled $82.7 million after giving effect to the issuance of $4.3 million in outstanding but undrawn irrevocable standby letters of credit. See Note 9 - Debt of the notes to our consolidated financial statements included in Item 8 of this Annual Report for further discussion of our debt obligations. Our existing and future debt services obligations could have significant consequences, including among other things:

•limiting our ability to obtain additional financing, if necessary, for working capital, capital expenditures, acquisitions or other purposes and/or obtaining such financing on favorable terms;

•reducing our funds available for operations, future business opportunities and cash distributions to unitholders by that portion of our cash flow required to make interest payments on our debt;

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•increasing our vulnerability to competitive pressures or a downturn in our business or the economy generally; and

•limiting our flexibility in responding to changing business and economic conditions.

Our ability to service our debt will depend upon, among other things, our future financial and operating performance, which will be affected by prevailing economic conditions and financial, business and other factors, many of which are beyond our control, such as commodity prices and governmental regulation.

We may not be able to generate sufficient cash to service all of our indebtedness and may be forced to take other actions to satisfy our obligations under our indebtedness or to refinance, which may not be successful.

Our ability to make scheduled payments on, or to refinance, our indebtedness obligations, including the ABL Facility and the Senior Notes, depends on our financial condition and operating performance, which are subject to prevailing economic and competitive conditions and certain financial, business and other factors beyond our control. We may not be able to maintain a level of cash flows from operating activities sufficient to permit us to pay the principal, premium, if any, and interest on our indebtedness.

If our operating cash flows and capital resources are insufficient to fund our debt service obligations, we may be forced to adopt alternative financing strategies, such as reducing or delaying investments and capital expenditures, selling assets, seeking additional capital or restructuring or refinancing our indebtedness, some or all of which may not be available to us on terms acceptable to us, if at all, or such alternative strategies may yield insufficient funds to make required payments on our indebtedness.

The 2025 Senior Notes will mature on April 15, 2025. The 2026 Unsecured Notes will mature on October 15, 2026. The 2026 Secured Notes will mature on October 15, 2026; provided that, if the outstanding amount of the 2025 Senior Notes (or any refinancing indebtedness in respect thereof that has a final maturity on or prior to the date that is 91 days after the Initial Maturity Date (as defined in the 2026 Secured Notes Indenture)) is greater than or equal to $50.0 million on January 14, 2025, which is 91 days prior to the scheduled maturity date of the 2025 Senior Notes, then the 2026 Secured Notes will mature on January 14, 2025. As of December 31, 2023, $49.8 million of the 2025 Senior Notes, $209.5 million of the 2026 Unsecured Notes and $785.0 million of the 2026 Secured Notes were outstanding.

The ABL Facility will mature on May 1, 2026; provided that if the outstanding amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date (as defined in the ABL Agreement)) on such date equals or exceeds $50.0 million, then the ABL Facility will mature on December 13, 2024. As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

Our ability to restructure or refinance our indebtedness will depend on the condition of the capital markets, including the market for senior secured or unsecured notes, and our financial condition at the time. Any refinancing of our indebtedness could be at higher interest rates, may require the pledging of collateral and may require us to comply with more onerous covenants than we are currently subject to, which could further restrict our business operations. In addition, any failure to make payments of interest and principal on our outstanding indebtedness on a timely basis would likely result in a reduction of our credit rating, which could harm our ability to incur additional indebtedness on acceptable terms. In the absence of sufficient cash flows and capital resources, we could face substantial liquidity problems and might be required to dispose of material assets or operations to meet our debt service and other obligations.

The indentures governing the Senior Notes and the ABL Facility place certain restrictions on our ability to dispose of assets and our use of the proceeds from such dispositions. We may not be able to consummate those dispositions on terms acceptable to it, if at all, and the proceeds of any such dispositions may not be adequate to meet any debt service obligations then due.

Further, if for any reason we are unable to meet our debt service and principal repayment obligations, or if we fail to comply with the financial covenants in the documents governing our debt, we would be in default under the terms of the agreements governing our debt, which would allow our creditors under those agreements to declare all outstanding indebtedness thereunder to be due and payable (which would in turn trigger cross-acceleration or cross-default rights among our other debt agreements), the lenders under the ABL Facility could terminate their commitments to extend credit, and the lenders could foreclose against our assets securing their borrowings and we could be forced into bankruptcy or liquidation. If the amounts outstanding under our debt agreements were to be accelerated, we cannot assure you that our assets would be sufficient to repay in full the amounts owed to our creditors.

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Restrictions in the Permian Transmission Credit Facilities, the indentures governing the Senior Notes and the ABL Facility could materially adversely affect our business, financial condition, results of operations, ability to satisfy these obligations to make cash distributions to unitholders and value of our common units.

We are dependent upon the earnings and cash flows generated by our operations to meet our debt service obligations and to make cash distributions to our unitholders, if any. The operating and financial restrictions and covenants in the Permian Transmission Credit Facilities, the indentures governing the Senior Notes, the ABL Facility and any future financing agreements could restrict our ability to finance future operations or capital needs or to expand or pursue our business activities, which may, in turn, limit our ability to satisfy our obligations and make cash distributions to our unitholders. For example, the ABL Facility, the Permian Transmission Credit Facilities and the indentures governing the Senior Notes, taken together, restrict our ability to, among other things:

•incur or guarantee certain additional debt;

•make certain cash distributions on or redeem or repurchase certain units;

•make payments on certain other indebtedness;

•make certain investments and acquisitions;

•make certain capital expenditures;

•incur certain liens or other encumbrances or permit them to exist;

•enter into certain types of transactions with affiliates;

•enter into sale and lease-back transactions and certain operating leases;

•merge or consolidate with another company or otherwise engage in a change of control transaction; and

•transfer, sell or otherwise dispose of certain assets.

The ABL Facility also contains covenants requiring Summit Holdings to maintain certain financial ratios and meet certain tests. Summit Holdings’ ability to meet those financial ratios and tests can be affected by events beyond its control, and we cannot guarantee that Summit Holdings will meet those ratios and tests.

The provisions of the Permian Transmission Credit Facilities, the indentures governing the Senior Notes, and the ABL Facility may affect our ability to obtain future financing and pursue attractive business opportunities as well as affect our flexibility in planning for, and reacting to, changes in business conditions. In addition, a failure to comply with the provisions of the Permian Transmission Credit Facilities, the indentures governing the Senior Notes, and the ABL Facility could result in a default or an event of default that could enable our lenders and/or senior noteholders to declare the outstanding principal of that debt, together with accrued and unpaid interest, to be immediately due and payable. If we were unable to repay the accelerated amounts, the lenders under the ABL Facility could proceed against the collateral granted to them to secure such debt. If the payment of the debt is accelerated, our assets may be insufficient to repay such debt in full, and our unitholders could experience a partial or total loss of their investment. The ABL Facility also has cross default provisions that apply to any other indebtedness we may have, and the indentures governing the Senior Notes have cross default provisions that apply to certain other indebtedness. Any of these restrictions in the ABL Facility, the Permian Transmission Credit Facilities and the indentures governing the Senior Notes could materially adversely affect our business, financial condition, cash flows and results of operations.

The interest rate on the 2026 Secured Notes will be increased if the Partnership fails to make certain offers to purchase 2026 Secured Notes.

Under the 2026 Secured Notes Indenture, the Partnership is required, starting in the first quarter of 2023 with respect to the fiscal year ended December 31, 2022, and continuing annually through the fiscal year ending December 31, 2025, subject to its ability to do so under the ABL Facility, to purchase an amount of 2026 Secured Notes equal to 100% of the Excess Cash Flow (as defined in the 2026 Secured Notes Indenture) minus certain agreed amounts, if any, generated in the prior year at a purchase price equal to 100% of the principal amount plus accrued and unpaid interest. Excess Cash Flow is generally defined as consolidated cash flow minus the sum of capital expenditures and cash payments in respect of permitted investments and permitted restricted payments. Generally, if the Partnership does not offer to purchase designated annual amounts of its 2026 Secured Notes for the Excess Cash Flow periods ending 2022, 2023 or 2024, the interest rate on the 2026 Secured Notes is subject to certain rate escalations. Because the Partnership did not offer to purchase at least $50.0 million in aggregate principal amount of 2026 Secured Notes by April 1, 2023, the interest rate on the 2026 Secured Notes automatically increased by 50 basis points per annum. If the Partnership has not offered to purchase $100.0 million in aggregate principal amount of 2026 Secured Notes by April 1, 2024, the interest rate on the 2026 Secured Notes shall automatically increase by 100 basis points per annum (minus any amount previously increased). If the Partnership has not offered to purchase at least $200.0 million in

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aggregate principal amount of 2026 Secured Notes by April 1, 2025, the interest rate on the 2026 Secured Notes shall automatically increase by 200 basis points per annum (minus any amount previously increased). We do not anticipate making offers to purchase in the designated amount for the fiscal year ended 2023, and, as a result, the interest rate on the 2026 Secured Notes will increase an incremental 50 basis points to 9.50% effective April 1, 2024, resulting in an incremental increase in annual interest expense of approximately $3.9 million. An increase in the interest rates associated with our 2026 Secured Notes would adversely affect our results of operations and reduce cash flow available for other purposes, including making other required payments of our debt obligations or capital expenditures. In addition, an increase in interest rates on the 2026 Secured Notes could adversely affect our future ability to obtain financing on attractive terms or materially increase the cost of any additional financing.

Inflation could have adverse effects on our results of operation.

Although inflation in the United States had been relatively low for many years, there was a significant increase in inflation beginning in the second half of 2021 through 2023 due to a substantial increase in money supply, a stimulative fiscal policy, a significant rebound in consumer demand as COVID-19 restrictions were relaxed, the Russia-Ukraine war and worldwide supply chain disruptions resulting from the economic contraction caused by COVID-19 and lockdowns followed by a rapid recovery. Inflation rose from 5.4% in June 2021 to 7.0% in December 2021 to 8.2% in September 2022.

While inflation has declined since the second half of 2022, declining to 3.4% in December 2023, further increases in inflation in 2024 could increase our labor and other operating costs and the overall cost of capital projects we undertake. An increase in inflation rates could negatively affect the Partnership’s profitability and cash flows, due to higher wages, higher operating costs, higher financing costs, and/or higher supplier prices. The Partnership may be unable to pass along such higher costs to its customers. In addition, inflation may adversely affect customers’ financing costs, cash flows, and profitability, which could adversely impact their operations and the Partnership’s ability to offer credit and collect receivables.

An increase in interest rates will cause our debt service obligations to increase.

Since March 2022, the Federal Reserve has raised its target range for the federal funds rate multiple times to a current target range of 5.25% to 5.50%, and the timing of any potential further increases or decreases remains uncertain. Borrowings under the ABL Facility and the Permian Transmission Credit Facilities bear interest at rates equal to SOFR plus margin. The interest rates are subject to adjustment based on fluctuations in SOFR, as applicable. An increase in the interest rates associated with our floating rate debt would increase our debt service costs and affect our results of operations and cash flow available for payments of our debt obligations. In addition, an increase in interest rates could adversely affect our future ability to obtain financing or materially increase the cost of any additional financing.

A downgrade of our credit rating could impact our liquidity, access to capital and our costs of doing business, and independent third parties determine our credit ratings outside of our control.

Moody’s Investors Service, Inc., Standard & Poor’s Ratings Services or Fitch Ratings, Inc. assign ratings to our senior unsecured credit from time to time. A downgrade of our credit rating could increase our future cost of borrowing and could require us to post collateral with third parties, including our hedging arrangements, which could negatively impact our available liquidity and increase our cost of debt. If a credit rating downgrade and the resultant cash collateral requirement were to occur at a time when we are experiencing significant working capital requirements or otherwise lacking liquidity, our results of operations, financial condition and cash flows could be adversely affected.

We have in the past and may in the future incur losses due to an impairment in the carrying value of our long-lived assets or equity method investments.

We recorded long-lived asset impairments of $0.5 million in 2023 and $91.6 million in 2022. When evidence exists that we will not be able to recover a long-lived asset's carrying value through future cash flows, we write down the carrying value of the asset to its estimated fair value. We test long-lived assets for impairment when events or circumstances indicate that the carrying value of a long-lived asset may not be recoverable. With respect to property, plant and equipment and our amortizing intangible assets, the carrying value of a long-lived asset is not recoverable if the carrying value exceeds the sum of the undiscounted cash flows expected to result from the asset's use and eventual disposal. In this situation, we recognize an impairment loss equal to the amount by which the carrying value exceeds the asset's fair value. We determine fair value using either a market-based approach, an income-based approach in which we discount the asset's expected future cash flows to reflect the risk associated with achieving the underlying cash flows, or a mixture of both market-and income-based approaches. We evaluate our equity method investments for impairment whenever events or circumstances indicate that a decline in fair value is other than temporary. Any impairment determinations involve significant assumptions and judgments. If actual results are not consistent with our assumptions and estimates, or our assumptions and estimates change due to new information, we may be exposed to impairment charges. Adverse changes in our business or the overall operating environment, such as lower

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commodity prices, may affect our estimate of future operating results, which could result in future impairment due to the potential impact on our operations and cash flows.

A portion of our revenues are directly exposed to changes in crude oil, natural gas and NGL prices, and our exposure may increase in the future.

During the year ended December 31, 2023, we derived 39% of our revenues from (i) the sale of physical natural gas and/or NGLs purchased under percentage-of-proceeds or other processing arrangements with certain of our customers in the Rockies and Piceance segments, (ii) the sale of natural gas we retain from certain Barnett customers, (iii) the sale of condensate we retain from our gathering services in the Piceance segment and (iv) additional gathering fees that are tied to performance of certain commodity price indexes, which are then added to the fixed gathering rates. Consequently, our existing operations and cash flows have direct exposure to commodity price risk. Although we will seek to limit our commodity price exposure with new customers in the future, our efforts to obtain fee-based contractual terms may not be successful or the local market for our services may not support fee-based gathering and processing agreements. For example, we have percent-of-proceeds contracts with certain natural gas producer customers and we may, in the future, enter into additional percent-of-proceeds contracts with these customers or other customers or enter into keep-whole arrangements, which would increase our exposure to commodity price risk, as the revenues generated from those contracts directly correlate with the fluctuating price of the underlying commodities.

Furthermore, we may acquire or develop additional midstream assets in the future that have a greater exposure to fluctuations in commodity price risk than our current operations. Future exposure to the volatility of natural gas and crude oil prices could have a material adverse effect on our business, results of operations and financial condition. For example, for a small portion of the natural gas gathered on our systems, we purchase natural gas from producers prior to delivering the natural gas to pipelines where we typically resell the natural gas under arrangements including sales at index prices. Generally, the gross margins we realize under these arrangements decrease in periods of low natural gas prices. If we expand the implementation of such natural gas purchase and sale arrangements within our business, such fluctuations could materially affect our business.

Regulatory and Environmental Policy Risks

We settled a matter that was previously under investigation by federal and state regulatory agencies regarding a pipeline rupture and release of produced water by one of our subsidiaries. The resulting compliance requirements of the settlement may impact our results of operations or cash flows.

As further described in Item 3. Legal Proceedings, on August 4, 2021, we settled an incident involving a produced water disposal pipeline owned by our subsidiary Meadowlark Midstream that resulted in a discharge of materials into the environment which was investigated by federal and state agencies. This settlement resulted in losses amounting to $36.3 million and will be paid over five to six years, of which we have paid principal amounts of $14.7 million as of December 31, 2023 and requires compliance with certain conditions and terms and conditions which may impact our results of operations or cash flows.

We may, from time to time, be involved in litigation and claims arising out of our operations in the normal course of business. As a result, we may be required to expend significant funds for legal defense or to settle claims. Any such loss, if incurred, could be material.

Expenditures made by the Partnership for the payment of litigation related costs, including legal defense costs and settlement payments, if any, reduce our cash flows available for debt service and distributions to our unitholders, if any. Any such expenditures, if incurred, could be material. See Item 3. Legal Proceedings for additional disclosure by the Partnership regarding its ongoing litigation and claims.

A change in laws and regulations applicable to our assets or services, or the interpretation or implementation of existing laws and regulations may cause our revenues to decline or our operation and maintenance expenses to increase.

Various aspects of our operations are subject to regulation by the various federal, state and local departments and agencies that have jurisdiction over participants in the energy industry. The regulation of our activities and the natural gas and crude oil industries frequently change as they are reviewed by legislators and regulators. For example, PHMSA has issued new proposed and final rules concerning pipeline safety in recent years. In November 2021, PHMSA issued a final rule that extended pipeline safety requirements to onshore gas gathering pipelines. The rule requires all onshore gas gathering pipeline operators to comply with PHMSA’s incident and annual reporting requirements. It also extends existing pipeline safety requirements to a new category of gas gathering pipelines, “Type C” lines, which generally include high-pressure pipelines that are larger than 8.625 inches in diameter. Safety requirements applicable to Type C lines vary based on pipeline diameter and potential failure consequences. The final rule became effective in May 2022 and operators were required to comply with the applicable safety requirements by November 2022. In addition, in August 2022, PHMSA issued a final rule that established new or additional requirements for natural gas transmission lines related to the management of change process, integrity management, corrosion control standards, and pipeline inspections and repairs. In May 2023, PHMSA published a Notice of Proposed Rulemaking for

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regulatory amendments to reduce methane emissions from new and existing gas transmission, distribution, and regulated gas gathering pipelines with strengthened leakage survey and patrolling requirements, performance standards for advanced leak detection programs, leak grading and repair criteria with mandatory repair timelines, requirements for mitigation of emissions from blowdowns, pressure relief device design, configuration, and maintenance requirements, clarified requirements for investigating failures, and expanded reporting requirements. To the extent these or other new proposed or final rules create additional requirements for our pipelines, they could have a material adverse effect on our operations, operating and maintenance expenses and revenues. For additional information on the potential risks associated with PHMSA requirements, see the “We may incur greater than anticipated costs and liabilities as a result of pipeline safety requirements” section of Item 1A. Risk Factors.

In addition, the adoption of proposals for more stringent legislation, regulation or taxation of drilling activity could directly curtail such activity or increase the cost of drilling, resulting in reduced levels of drilling activity and therefore reduced demand for our services. For example, Colorado Senate Bill 19-181, signed into law in April 2019, changed the mandate of the COGCC from fostering oil and gas development to regulating oil and gas development in a reasonable manner to protect public health and the environment. The new law also allows local governments to impose more restrictive requirements on oil and gas operations than those issued by the state. As part of its implementation of this new law, in November 2020 the COGCC adopted new regulations that increase oil and gas setbacks to a minimum of 2,000 feet from schools and childcare facilities, prohibit routine venting and flaring, increase wildlife protections, and alter certain aspects of the permitting process. These regulations and similar efforts in Colorado and elsewhere could restrict oil and gas development in the future. Regulatory agencies establish and, from time to time, change priorities, which may result in additional burdens on us, such as additional reporting requirements and more frequent audits of operations. Our operations and the markets in which we participate are affected by these laws, regulations and interpretations and may be affected by changes to them or their implementation, which may cause us to realize materially lower revenues or incur materially increased operation and maintenance costs or both.

Increased regulation of hydraulic fracturing could result in reductions or delays in customer production, which could materially adversely impact our revenues.

Hydraulic fracturing is an important and increasingly common practice that is used to stimulate production of natural gas and/or crude oil from dense subsurface rock formations, and is primarily regulated by state agencies. However, Congress has in the past, and may in the future consider legislation to regulate hydraulic fracturing by federal agencies. Many states have already adopted laws and/or regulations that require disclosure of the chemicals used in hydraulic fracturing. A number of states – such as Colorado, as discussed above – have adopted, and other states are considering adopting, legal requirements that could impose more stringent permitting, disclosure and well construction requirements on crude oil and/or natural gas drilling activities. For example, during the 2021-2022 election cycle, Colorado representatives proposed a ballot initiative to ban hydraulic fracturing on all non-federal land, but the proposed initiative failed to garner significant support. States also could elect to prohibit hydraulic fracturing altogether, as New York, Maryland, Oregon and Vermont have done. In addition, certain local governments have adopted, and additional local governments may adopt, ordinances within their jurisdictions regulating the time, place and manner of drilling activities in general or hydraulic fracturing activities in particular. These initiatives and similar efforts in Colorado and elsewhere could restrict oil and gas development in the future.

The EPA has also moved forward with various regulatory actions, including announcing final new regulations under the NSPS to expand and strengthen emissions reduction requirements under NSPS OOOOa for new, modified and reconstructed oil and natural gas sources, and require states to reduce methane emissions from existing sources nationwide. For further discussion of NSPS OOOOa and subsequent actions by the EPA, see the “Environmental Matters—Air Emissions” section of Item 1. Business of this Annual Report. The BLM has also asserted regulatory authority over aspects of the hydraulic fracturing process, and issued a final rule in March 2015 that established more stringent standards for performing hydraulic fracturing on federal and Indian lands, including requirements relating to well construction and integrity, handling of wastewater and chemical disclosure. However, in December 2017, the BLM published a final rule rescinding the 2015 rule. The U.S. District Court for the Northern District of California upheld the December 2017 rescission rule in a March 2020 decision, and the State of California and environmental plaintiffs appealed. The parties remain in settlement discussion.

Further, several federal governmental agencies (including the EPA) have conducted reviews and studies on the environmental aspects of hydraulic fracturing in the past. The results of such reviews or studies could spur initiatives to further regulate hydraulic fracturing.

State and federal regulatory agencies have also focused on a possible connection between the hydraulic fracturing related activities and the increased occurrence of seismic activity. When caused by human activity, such events are called induced seismicity. Some state regulatory agencies, including those in Colorado, Ohio, and Texas, have modified their regulations or guidance to account for induced seismicity. These developments could result in additional regulation and restrictions on the use of injection disposal wells and hydraulic fracturing. Such regulations and restrictions could cause delays and impose additional costs and restrictions on our customers.

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Additionally, certain of our customers produce oil and gas on federal lands. On January 20, 2021, the Acting Secretary for the Department of the Interior signed an order effectively suspending new fossil fuel leasing and permitting on federal lands for 60 days. Then on January 27, 2021, President Biden issued an executive order indefinitely suspending new oil and natural gas leases on public lands or in offshore waters pending completion of a comprehensive review and reconsideration of federal oil and gas permitting and leasing practices. Several states filed lawsuits challenging the suspension, and on June 15, 2021, a judge in the U.S. District Court for the Western District of Louisiana issued a nationwide temporary injunction blocking the suspension in July 2021. Although the injunction was subsequently overturned by the Court of Appeals for the Fifth Circuit, on remand the U.S. District Court issued a permanent injunction as requested by the plaintiff states in August 2022. The Department of the Interior has since resumed leasing. In July 2023, DOI proposed updates to its onshore oil and gas leasing regulations which could further restrict oil and gas exploration and production on federal lands. DOI expects to issue a final rule in the spring of 2024. The Biden Administration continues to evaluate federal leasing and could impose additional restrictions in the future.

If new or more stringent federal, state or local legal restrictions relating to drilling activities or to the hydraulic fracturing process are adopted, this could result in a reduction in the supply of natural gas and/or crude oil that our customers produce, and could thereby adversely affect our revenues and results of operations. Compliance with such rules could also generally result in additional costs, including increased capital expenditures and operating costs, for our customers, which could ultimately decrease end-user demand for our services and could have a material adverse effect on our business.

We are subject to FERC jurisdiction, federal anti-market manipulation laws and regulations, potentially other federal regulatory requirements and state and local regulation and could be materially affected by changes in such laws and regulations, or in the way they are interpreted and enforced.

We believe that our natural gas pipeline facilities qualify as gathering facilities that are exempt from the jurisdiction of FERC under the NGA and the NGPA. Interstate movements of crude oil on the Epping Pipeline in North Dakota are subject to FERC jurisdiction under the ICA, and the rates, terms and conditions of service, and practices on the pipeline are subject to review and challenge before FERC.

Additionally, the Double E Pipeline, which provides interstate natural gas transmission service from southeastern New Mexico to the Waha hub in Texas, is subject to FERC jurisdiction under the NGA with respect to post-construction remediation activities, operations, and rates and terms and conditions of service. Pursuant to the NGA, Double E Pipeline’s existing interstate natural gas transportation rates and terms and conditions of service may be challenged by complaint and are subject to prospective change by FERC. Additionally, rate changes and changes to terms and conditions of service proposed by a regulated natural gas interstate pipeline may be protested and such changes can be delayed and may ultimately be rejected by FERC. FERC may also initiate reviews of an interstate pipeline’s rates. We cannot guarantee that any new or existing tariff rate for service on our FERC-regulated pipelines would not be rejected or modified by the FERC or subjected to refunds. Any successful challenge by a regulator or shipper in any of these matters could have a material adverse effect on our business, financial condition and results of operations.

We have certain long-term fixed priced natural gas and crude oil transportation contracts that cannot be adjusted even if our costs increase. As a result, our costs could exceed our revenues. In 2021, we entered into negotiated rate agreements with an average term of 10 years from the in-service date of the pipeline, which occurred on November 18, 2021 and with total MDTQ’s that increases from 585,000 Dth/d during the first year of the agreement to 1,000,000 Dth/d in the fourth year, which equates to approximately 74% of its certificated capacity of 1,350,000 Dth/d, these contracts are not subject to adjustment, even if our cost to perform such services exceeds the revenues received from such contracts, and, as a result, our costs could exceed our revenues received under such contracts. It is possible that costs to perform services under our “negotiated or discount rate” contracts will exceed the negotiated or discounted rates. It is also possible with respect to discounted rates that if our filed “recourse rates” should ever be reduced below applicable discounted rates, we would only be allowed by FERC to charge the lower recourse rates, since FERC policy does not allow discount rates to be charged to the extent that they exceed applicable recourse rates. If these events were to occur, it could decrease the cash flow realized by our assets.

Under FERC policy, a regulated service provider and a customer may mutually agree to sign a contract for service at a “negotiated rate,” which is generally fixed between the natural gas pipeline and the shipper for the contract term and does not necessarily vary with changes in the level of cost-based “recourse rates,” provided that the affected customer is willing to agree to such rates and that the FERC has accepted the negotiated rate agreement. These “negotiated or discount rate” contracts are not generally subject to adjustment for increased costs which could be caused by inflation or other factors relating to the specific facilities being used to perform the services. Any shortfall of revenue, representing the difference between “recourse rates” (if higher) and negotiated or discounted rates, under current FERC policy, may be recoverable from other shippers in certain circumstances. For example, the FERC may recognize this shortfall in the determination of prospective rates in a future rate case. However, if the FERC were to disallow the recovery of such costs from other customers, it could decrease the cash flow realized by our assets.

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We are also generally subject to the anti-market manipulation provisions in the NGA, as amended by the Energy Policy Act of 2005, and to FERC’s regulations thereunder, and also must comply with the other applicable provisions of the NGA and NGPA and FERC’s rules, regulations, and orders concerning the Double E Pipeline’s interstate natural gas pipeline business, including those that require us to provide firm and interruptible transportation service on an open access basis that is not unduly discriminatory or preferential. Violations of the NGA or NGPA, or the rules, regulations, and orders issued by FERC thereunder could result in the imposition of administrative and criminal remedies, including without limitation, revocation of certain authorities, disgorgement of ill-gotten gains, and civil penalties of up to approximately $1.5 million per day per violation of the NGA or its implementing regulations, subject to future adjustment for inflation. In addition, the FTC holds statutory authority under the Energy Independence and Security Act of 2007 to prevent market manipulation in oil markets, and has adopted broad rules and regulations prohibiting fraud and market manipulation. The FTC is also authorized to seek fines of up to approximately $1.5 million per violation, subject to future adjustment for inflation. The CFTC is directed under the CEA to prevent price manipulation in the commodity, futures and swaps markets, including the energy markets. Pursuant to the Dodd-Frank Act, and other authority, the CFTC has adopted additional anti-market manipulation regulations that prohibit fraud and price manipulation in the commodity, futures and swaps markets. The CFTC also has statutory authority to seek civil penalties of up to the greater of approximately $1.5 million per violation, subject to future adjustment for inflation, or triple the monetary gain to the violator for each violation of the anti-market manipulation provisions of the CEA.

The distinction between federally unregulated natural gas and crude oil pipelines and FERC-regulated natural gas and crude oil pipelines has been the subject of extensive litigation and is determined by FERC on a case-by-case basis. FERC has made no determinations as to the status of our facilities. Consequently, the classification and regulation of some of our pipelines could change based on future determinations by FERC, Congress or the courts. If our natural gas gathering operations or crude oil operations beyond the Epping Pipeline become subject to FERC jurisdiction under the NGA, the NGPA or the ICA, the result may materially adversely affect the rates we are able to charge and the services we currently provide, and may include the potential for a termination of our gathering agreements with our customers. In addition, if any of our facilities were found to have provided services or otherwise operated in violation of the NGA, the NGPA or the ICA, this could result in the imposition of civil penalties, as well as a requirement to disgorge charges collected for such services in excess of the rate established by FERC.

We are subject to state and local regulation regarding the construction and operation of our gathering, treating, transporting and processing systems, as well as state ratable take statutes and regulations. Regulation of the construction and operation of our facilities may affect our ability to expand our facilities or build new facilities and such regulation may cause us to incur additional operating costs or limit the quantities of natural gas and crude oil we may gather, treat and process. Ratable take statutes and regulations generally require gatherers to take natural gas and crude oil production that may be tendered for gathering without undue discrimination. These requirements restrict our right to decide whose production we gather, treat and process. Many states have adopted complaint-based regulation of gathering, treating, transporting and processing activities, which allows producers and shippers to file complaints with state regulators in an effort to resolve access issues, rate grievances and other matters. Other state and municipal regulations do not directly apply to our business, but may nonetheless affect the availability of natural gas and crude oil for gathering, treating, transporting and processing, including state regulation of production rates, maximum daily production allowable from wells, and other activities related to drilling and operating wells. While our facilities currently are subject to limited state and local regulation, there is a risk that state or local laws will be changed or reinterpreted, which may materially affect our operations, operating costs and revenues.

Recent actions by the FERC may affect rates on Epping Pipeline, Double E Pipeline and other future FERC-regulated pipelines.

On March 15, 2018, FERC announced a revised policy prohibiting FERC-jurisdictional natural gas and liquids pipelines owned by master limited partnerships from including an allowance for income taxes in the cost of service used to calculate tariff rates. Most of our pipelines are not subject to FERC regulation and so will not be affected by the revised policy statement. However, rates for interstate movements of crude oil on our Epping Pipeline in North Dakota and any future FERC-regulated pipelines may be affected by the application of the revised policy statement in subsequent FERC proceedings.

FERC has not required regulated interstate oil pipelines to decrease their rates on an industry-wide basis to implement the new policy. However, FERC stated that the effects of the revised policy statement must be incorporated in annual FERC financial reports made by regulated interstate oil pipelines. These reports, which also reflected the impact of the corporate income tax reduction enacted as part of the Tax Reform Legislation, were considered by FERC in its five-year review and determination of the index rate adjustment, which resulted in the December 17, 2020 order adopting a new annual index adjustment for the five-year period starting July 1, 2021. FERC ultimately removed the effect of the income tax allowance policy change from its index calculation. FERC’s rulings on the appropriate annual index adjustment for the five-year period starting July 1, 2021 are pending before the U.S. Court of Appeals for the District of Columbia Circuit. The impact of these proceedings on Epping Pipeline and any future FERC-regulated pipelines is uncertain at this time.

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Until FERC sets the next index rate adjustment, Epping Pipeline and any future FERC-regulated pipelines may face an increased risk of shipper complaints seeking FERC review of its rates. FERC can also initiate review of rates on its own initiative. We could also propose new cost-of-service rates or changes to our existing rates that would be subject to review by FERC under its new policy. No such proceedings have occurred at this time, however, and the potential outcome of any such proceedings, should any materialize, is uncertain. As a result of any such proceedings, Epping Pipeline and any future FERC-regulated pipelines may be required to modify their rates, which could affect the revenues we generate with our Epping Pipeline and any future FERC-regulated pipelines. At this time, we do not expect any such proceedings would have a material adverse effect, but we intend to monitor FERC developments and provide updated disclosure, as necessary.

We are subject to stringent environmental laws and regulations that may expose us to significant costs and liabilities.

Our gathering, treating, transporting and processing operations are subject to stringent and complex federal, state and local environmental laws and regulations, including laws and regulations regarding the discharge of materials into the environment or otherwise relating to environmental protection, including, for example, the CAA, CERCLA, the CWA, the OPA, the RCRA, the Endangered Species Act and the Toxic Substances Control Act.

These laws and regulations may impose numerous obligations that are applicable to our operations, including the acquisition of permits to conduct regulated activities, the incurrence of capital or operating expenditures to limit or prevent releases of materials from our pipelines and facilities, and the imposition of substantial liabilities and remedial obligations for pollution resulting from our operations or at locations currently or previously owned or operated by us. For additional information on specific laws and regulations, see the “Environmental Matters” section of Item 1. Business. Numerous governmental authorities, such as the EPA and analogous state agencies, have the power to enforce compliance with these laws and regulations and the permits issued under them, oftentimes requiring difficult and costly corrective actions or costly pollution control measures. Failure to comply with these laws, regulations and requisite permits may result in the assessment of significant administrative, civil and criminal penalties, the imposition of remedial obligations and the issuance of injunctions limiting or preventing some or all of our operations. In addition, we may experience a delay in obtaining or be unable to obtain required permits or regulatory authorizations, which may cause us to lose potential and current customers, interrupt our operations and limit our growth and revenue.

There is a risk that we may incur significant environmental costs and liabilities in connection with our operations due to historical industry operations and waste disposal practices, our handling of hydrocarbons and other wastes and potential emissions and discharges related to our operations. Joint and several, strict liability may be incurred, without regard to fault, under certain of these environmental laws and regulations in connection with discharges or releases of hydrocarbon wastes on, under or from our properties and facilities, many of which have been used for midstream activities for a number of years, oftentimes by third parties not under our control. Private parties, including the owners of the properties through which our gathering systems pass, and on which certain of our facilities are located, may also have the right to pursue legal actions to enforce compliance as well as to seek damages for non-compliance with environmental laws and regulations or for personal injury or property damage. For example, an accidental release from one of our pipelines could subject us to substantial liabilities arising from environmental cleanup and restoration costs, claims made by neighboring landowners and other third parties for personal injury and property damage and fines or penalties for related violations of environmental laws or regulations. In addition, changes in environmental laws occur frequently, and any such changes that result in additional permitting obligations or more stringent and costly waste handling, storage, transport, disposal or remediation requirements could have a material adverse effect on our operations or financial position. We may not be able to recover all or any of these costs from insurance.

The Biden Administration is considering revisions to the leasing and permitting programs for oil and gas development on federal lands, which could materially adversely affect our industry and our financial condition and results of operations.

We may incur greater than anticipated costs and liabilities as a result of pipeline safety requirements.

The DOT, through PHMSA, has adopted and enforces safety standards and procedures applicable to our pipelines. In addition, many states, including the states in which we operate, have adopted regulations that are identical to or more restrictive than existing DOT regulations for intrastate pipelines. Among the regulations applicable to us, PHMSA requires pipeline operators to develop integrity management programs for certain pipelines located in high consequence areas, which include high population areas such as the Dallas-Fort Worth greater metropolitan area where our DFW Midstream system is located. While the majority of our pipelines have historically met the DOT definition of gathering lines and were thus exempt from PHMSA's integrity management requirements, we also operate a limited number of pipelines that are subject to the integrity management requirements. The regulations require operators, including us, to:

•perform ongoing assessments of pipeline integrity;

•identify and characterize applicable threats to pipeline segments that could impact a high consequence area;

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•maintain processes for data collection, integration and analysis;

•repair and remediate pipelines as necessary;

•adopt and maintain procedures, standards and training programs for control room operations; and

•implement preventive and mitigating actions.

In addition, PHMSA has taken recent action to regulate gathering systems, which includes integrity management requirements. In November 2021, PHMSA issued a final rule that extended pipeline safety requirements to onshore gas gathering pipelines. The rule requires all onshore gas gathering pipeline operators to comply with PHMSA’s incident and annual reporting requirements. It also extends existing pipeline safety requirements to a new category of gas gathering pipelines, “Type C” lines, which generally include high-pressure pipelines that are larger than 8.625 inches in diameter. Safety requirements applicable to Type C lines vary based on pipeline diameter and potential failure consequences. The final rule became effective in May 2022 and compliance with the applicable safety requirements was required by November 2022.

For additional information on PHMSA regulations relating to pipeline safety, see the “Regulation of the Natural Gas and Crude Oil Industries—Safety and Maintenance” section of Item 1. Business and the “A change in laws and regulations applicable to our assets or services, or the interpretation or implementation of existing laws and regulations may cause our revenues to decline or our operation and maintenance expenses to increase” section of Item 1A. Risk Factors.

Climate change legislation, regulatory initiatives and litigation could result in increased operating costs and reduced demand for the services we provide.

In recent years, the U.S. Congress has considered legislation to restrict or regulate emissions of GHGs, such as carbon dioxide and methane that may be contributing to global warming and energy legislation and other initiatives are expected to be proposed that may be relevant to GHG emissions issues. For example, the Inflation Reduction Act, signed into law in August 2022, includes a Methane Emissions Reduction Program to incentivize methane emission reductions and impose a fee on GHG emissions from certain oil and gas facilities.

In addition, almost half of the states, either individually or through multi-state regional initiatives, have begun to address GHG emissions, primarily through the planned development of emission inventories or regional GHG cap and trade programs. Most of these cap and trade programs work by requiring either major sources of emissions, such as electric power plants, or major producers of fuels, such as refineries and gas processing plants, to acquire and surrender emission allowances. In general, the number of allowances available for purchase is reduced each year until the overall GHG emission reduction goal is achieved. Depending on the scope of a particular program, we could be required to purchase and surrender allowances for GHG emissions resulting from our operations (e.g., at compressor stations). It is possible that certain components of our operations, such as our gas-fired compressors, could become subject to state-level GHG-related regulation. For example, in June 2022, as part of a Governor-directed statewide initiative to reduce GHG emissions by at least 45% by 2030, the New Mexico Environment Department (“NMED”) finalized new rules that would establish emissions standards for VOCs and nitrogen oxides for oil and gas production and processing sources located in certain areas of the state with high ozone concentrations. We cannot currently determine the effect of these proposed regulations and other regulatory initiatives to implement the Governor’s directive to reduce GHG emissions, that could, if implemented, impact the business, reputation, financial condition or results of our operations in New Mexico or that of our customers upstream of the Double E Pipeline. Similarly, in April 2021, the New Mexico Department of Energy, Minerals, and Natural Resources (“EMNRD”) finalized new rules concerning venting and flaring of natural gas. EMNRD’s final rule could impose new or increased costs and obligations on our customers upstream of the Double E Pipeline.

Independent of Congress, the EPA has adopted regulations under its existing CAA authority. In 2009, the EPA published its findings that emissions of GHGs present an endangerment to public health and the environment because emissions of such gases are contributing to warming of the earth's atmosphere and other climatic changes. Based on these findings, the EPA adopted regulations that, among other things, establish PSD construction and Title V operating permit reviews for certain large stationary sources of GHG emissions. For additional information on EPA regulations adopted under the CAA, see the “Environmental Matters—Climate Change” and “Environmental Matters—Air Emissions” sections of Item 1. Business.

Further, in December 2015, over 190 countries, including the United States, reached an agreement to reduce global GHG emissions. The agreement entered into force in November 2016 after over 70 countries, including the United States, ratified or otherwise consented to be bound by the agreement. In November 2019, the United States submitted formal notification to the United Nations that it intended to withdraw from the agreement. However, on January 20, 2021, President Biden signed an “Acceptance on Behalf of the United States of America” that, reversed the prior withdrawal, and the United States officially rejoined the Paris Agreement on February 19, 2021. As part of rejoining the Paris Agreement, President Biden announced that the United States would commit to a 50 to 52 percent reduction from 2005 levels of GHG emissions by 2030 and set the goal of reaching net-zero GHG emissions by 2050. In November 2021, the Biden Administration expanded on this commitment and

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announced “The Long-Term Strategy of the United States: Pathways to Net-Zero Greenhouse Gas Emissions by 2050,” establishing a roadmap to net zero emissions in the United States by 2050 through, among other things, improvements in energy efficiency; decarbonization of energy sources via electricity, hydrogen, and sustainable biofuels; and reductions in non-CO2 GHG emissions, such as methane and nitrous oxide. These initiatives followed a series of executive orders by President Biden designed to address climate change. On December 13, 2023, COP28 issued its first global stocktake, which calls on parties, including the US, to contribute to transitioning away from fossil fuels, reduce methane emissions, and increase renewable energy capacity, amongst other things, to achieve net zero by 2050. While the stocktake agreement is not legally binding and has no enforcement mechanism, the US could pass further legislation based on the agreement. Reentry into the Paris Agreement, the related stocktake agreement, new legislation, or President Biden’s executive orders may result in the development of additional regulations or changes to existing regulations, which could have a material adverse effect on our business and that of our customers.

Additionally, the SEC has proposed new rules relating to the disclosure of climate-related risks. The proposed rule contains several new disclosure obligations, including (i) disclosure on an annual basis of a registrant’s scope 1 and scope 2 greenhouse gas emissions, (ii) third-party independent attestation of the same for accelerated and large accelerated filers, (iii) for some registrants, disclosure on an annual basis of a registrant’s scope 3 greenhouse gas emissions for accelerated and large accelerated filers, (iv) disclosure on how the board of directors and management oversee climate-related risks and certain climate-related governance items, (v) disclosure of information related to a registrant’s climate-related targets, goals and/or transitions plans and (vi) disclosure on whether and how climate-related events and transition activities impact line items above a threshold amount on a registrant’s consolidated financial statements, including the impact of the financial estimates and the assumptions used. While we would likely be subject to the longer proposed phase-in for the reporting requirements as a smaller reporting company, and while the SEC may revise the proposed rule in response to comments to make the rule less onerous, we cannot predict the costs of implementation or any potential adverse impacts resulting from the rule should it be adopted. However, these costs may be substantial. In addition, enhanced climate disclosure requirements could accelerate the trend of certain stakeholders and lenders restricting or seeking more stringent conditions with respect to their investments in certain carbon intensive sectors.

Although it is not possible at this time to accurately estimate how potential future laws or regulations addressing GHG emissions would impact our business, either directly or indirectly, any future federal or state laws or implementing regulations that may be adopted to address GHG emissions could require us to incur increased operating costs and could materially adversely affect demand for our services. The potential increase in the costs of our operations resulting from any legislation or regulation to restrict emissions of GHG could include new or increased costs to operate and maintain our facilities, install new emission controls on our facilities, acquire allowances to authorize our GHG emissions, pay any taxes related to our GHG emissions, adhere to alternative energy requirements and administer and manage a GHG emissions program. While we may be able to include some or all of such increased costs in the rates we charge, such recovery of costs is uncertain. Moreover, incentives to conserve energy or use alternative energy sources could reduce demand for our services. We cannot predict with any certainty at this time how these possibilities may affect our operations. Finally, most scientists have concluded that increasing concentrations of GHGs in the Earth’s atmosphere may produce climate changes that have significant physical effects, such as increased frequency and severity of storms, droughts and floods and other climatic events. We cannot predict with any certainty at this time how these possibilities may affect our operations.

Statutory and regulatory requirements for swap transactions could have an adverse impact on our ability to hedge risks associated with our business and increase the working capital requirements to conduct these activities.

In the Dodd-Frank Act, Congress adopted comprehensive financial reform legislation that establishes federal oversight over and regulation of the over-the-counter derivatives market and entities, such as us, that participate in that market. Under this legislation, the CFTC and the SEC and other regulatory authorities have promulgated rules and regulations, including rules and regulations relating to the regulation of certain swaps market participants, such as swap dealers, the clearing of certain swaps through central counterparties, the execution of certain swaps on designated contract markets or swap execution facilities, mandatory margin requirements for uncleared swaps, and the reporting and recordkeeping of swaps. In light of the continuing adjustment of the regulations, we cannot predict the ultimate effect of the rules and regulations on our business. Any new regulations or modifications to existing regulations could increase the cost of derivative contracts, limit the availability of derivatives to protect against risks that we encounter, reduce our ability to monetize or restructure our existing derivative contracts, or increase our exposure to less creditworthy counterparties.

In October 2020, the CFTC adopted rules that place limits on positions in certain core futures and equivalent swaps contracts for or linked to certain physical commodities, subject to exceptions for certain bona fide hedging transactions. We do not expect these regulations to materially impede our hedging activity at this time, but a companion rule on aggregation among entities under common ownership or control may have an impact on our ability to hedge our exposure to certain enumerated commodities.

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The CFTC has implemented final rules regarding mandatory clearing of certain classes of interest rate swaps and certain classes of index credit default swaps. Mandatory trading on designated contract markets or swap execution facilities of certain interest rate swaps and index credit default swaps also began in 2014. At this time, the CFTC has not proposed any rules designating other classes of swaps, including physical commodity swaps, for mandatory clearing. The CFTC and prudential banking regulators also adopted mandatory margin requirements on uncleared swaps between swap dealers and certain other counterparties. Although we may qualify for a commercial end-user exception from the mandatory clearing, trade execution and certain uncleared swaps margin requirements, mandatory clearing and trade execution requirements and uncleared swaps margin requirements applicable to other market participants, such as swap dealers, may affect the cost and availability of the swaps that we use for hedging.

Under the Dodd-Frank Act, the CFTC is also directed generally to prevent price manipulation and fraud in the following two markets: (a) physical commodities traded in interstate commerce, including physical energy and other commodities, and (b) financial instruments, such as futures, options and swaps. The CFTC has adopted additional anti-market manipulation, anti-fraud and disruptive trading practices regulations that prohibit, among other things, fraud and price manipulation in the physical commodities, futures, options and swaps markets. Should we violate these laws and regulations, we could be subject to CFTC enforcement action and material penalties, and sanctions.

We currently enter into forward contracts with third parties to buy power and sell natural gas in an attempt to mitigate our exposure to fluctuations in the price of natural gas with respect to those volumes. The CFTC has finalized an interpretation clarifying whether and when certain forwards with volumetric optionality are to be regulated as forwards or qualify as options on commodities and therefore swaps. The application of this interpretation to any particular situation may impact our ability to enter into certain forwards or may impose additional requirements with respect to certain transactions.

In addition to the Dodd-Frank Act, regulators within the European Union and other foreign regulators have adopted and implemented local reforms generally comparable with the reforms under the Dodd-Frank Act. Enforcement of these regulatory provisions may reduce our ability to hedge our market risks with non-U.S. counterparties or may make any transactions involving cross-border swaps more expensive and burdensome. Additionally, the lingering absence of regulatory equivalency across jurisdictions may increase compliance costs and make it more costly to satisfy regulatory obligations.

We may face opposition to the development, permitting, construction or operation of our pipelines and facilities from various groups.

We may face opposition to the development, permitting, construction or operation of our pipelines and facilities from environmental groups, landowners, local groups and other advocates. Such opposition could take many forms, including organized protests, attempts to block or sabotage our operations, intervention in regulatory or administrative proceedings involving our assets, or lawsuits or other actions designed to prevent, disrupt or delay the development or operation of our assets and business. For example, repairing our pipelines often involves securing consent from individual landowners to access their property; one or more landowners may resist our efforts to make needed repairs, which could lead to an interruption in the operation of the affected pipeline or other facility for a period of time that is significantly longer than would have otherwise been the case. In addition, acts of sabotage or eco-terrorism could cause significant damage or injury to people, property or the environment or lead to extended interruptions of our operations. Any such event that interrupts the revenues generated by our operations, or which causes us to make significant expenditures not covered by insurance, could have a material adverse effect on our business, financial condition and results of operations. Moreover, governmental authorities exercise considerable discretion in the timing and scope of permit issuance and the public may engage in the permitting process, including through intervention in the courts. Negative public perception could cause the permits we require to conduct our operations to be withheld, delayed or burdened by requirements that restrict our ability to profitably conduct our business.

For example, in an April 15, 2020 ruling, amended May 11, 2020, the U.S. District Court for the District of Montana issued an order invalidating the U.S. Army Corps of Engineers (“Corps”) 2017 reissuance of Nationwide Permit 12 (“NWP 12”), the general permit governing discharges of dredged or fill material associated with pipeline and other utility line construction projects, to the extent it was used to authorize construction of new oil and gas pipelines. Environmental groups had alleged that the Corps failed to consult with federal wildlife agencies as required by the Endangered Species Act (“ESA”). However, in January 2021, the EPA and Corps reissued NWP 12 as a general permit specific to oil and gas pipelines, moving other utility line activities into separate general permits. The U.S. Court of Appeals for the Ninth Circuit subsequently held that the Corps’ January 2021 reissuance rendered the prior challenge moot. In May 2021, environmental groups once again filed suit in the U.S. District Court for the District of Montana, seeking vacatur of the reissued NWP 12. Environmental groups allege that the reissuance of NWP 12 violated the ESA, National Environmental Policy Act, and Clean Water Act, among other things. In September 2022, the U.S. District Court for Montana dismissed the ESA consultation challenges as moot and dismissed the remainder of the lawsuit without prejudice. The Corps has announced that it will be reviewing all the nationwide permits for consistency with Administration policies, which could result in additional limitations on the use of nationwide permits. Limitations on the use of NWP 12 may make it more difficult to permit our projects, require consideration of alternative

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construction or siting, which may impose additional costs and delays, and could cause us to lose potential and current customers and limit our growth and revenue.

In addition, on July 6, 2020, the U.S. District Court for the District of Columbia issued an order vacating a Corps Mineral Leasing Act easement for the Dakota Access Pipeline in a lawsuit filed by the Standing Rock Sioux Tribe and other Native American tribes. The court’s decision requires the pipeline to shut down operations by August 5, 2020 but was stayed by the U.S. Court of Appeals for the District of Columbia Circuit. On January 26, 2021, the U.S. Court of Appeals for the District of Columbia Circuit issued a decision affirming the district court’s holding that the easement should be vacated but reversing the requirement to shut down the pipeline. The Court of Appeals left it to the Corps to determine how to proceed after the loss of the easement, and while the Corps declined to shut down the pipeline, it did not formally approve the pipeline’s ongoing operation without an easement. Dakota Access filed for rehearing en banc on April 12, 2021, which the Court of Appeals denied. On September 20, 2021, Dakota Access filed a petition with the U.S. Supreme Court to hear the case. Oppositions were filed by the Solicitor General and plaintiffs, and Dakota Access has filed its reply.

The Dakota Access Pipeline continues to operate pending the Corps’ ongoing development of a court-ordered environmental impact statement for the project. On June 22, 2021, the District Court terminated the consolidated lawsuits and dismissed all remaining outstanding counts without prejudice. On January 20, 2022, the Standing Rock Sioux Tribe withdrew as a cooperating agency on the draft EIS, prompting the USACE to temporarily pause on the draft EIS. The USACE published the draft EIS on September 8, 2023 and tribal and public meetings were held in November and December of 2023. If the Dakota Access Pipeline is forced to shut down, this could have a material adverse effect on our business, financial condition and results of operations associated with the Polar and Divide system, which interconnects with the Dakota Access Pipeline.

Recently, activists concerned about the potential effects of climate change have directed their attention towards sources of funding for fossil-fuel energy companies, which has resulted in an increasing number of financial institutions, funds, individual investors and other sources of capital restricting or eliminating their investment in fossil fuel-related activities. In addition, financial institutions have begun to screen companies such as ours for sustainability performance, including practices related to GHGs and climate change, before providing loans or investing in our common units. There is also a risk that financial institutions may adopt policies that have the effect of reducing the funding provided to the fossil fuel sector, such as the adoption of net zero financed emissions targets. Such policies may be hastened by actions under the Biden Administration, including the implementation by the Federal Reserve of any recommendations made by the Network for Greening the Financial System, a consortium of financial regulators focused on addressing climate-related risks in the financial sector. Ultimately, this could make it more difficult to secure funding for exploration and production activities or energy infrastructure related projects, and consequently could both indirectly affect demand for our services and directly affect our ability to fund construction or other capital projects. Any efforts to improve our sustainability practices in response to these pressures may increase our costs, and we may be forced to implement technologies that are not economically viable in order to improve our sustainability performance and to meet the specific requirements to maintain access to capital or perform services for certain customers.

Our business is subject to complex and evolving U.S. and international laws and regulations regarding privacy and data protection (“data protection laws”). Many of these data protection laws are subject to change and uncertain interpretation, and could result in claims, increased cost of operations or otherwise harm our business.

Along with our own data and information that we collect and retain in the normal course of our business, we and our business partners collect and retain significant volumes of certain types of data, some of which are subject to data protection laws. The collection, use, and transfer of this data, both domestically and internationally, is becoming increasingly complex. The regulatory environment surrounding the collection, use, transfer and protection of such data is constantly evolving and can be subject to significant change. New data protection laws at the federal, state, international, national, provincial and local levels, including recent Colorado, Connecticut, Virginia and Utah legislation, the European Union General Data Protection Regulation (“GDPR”) and the California Consumer Privacy Act, as amended by the California Privacy Rights Act (“CCPA”), pose increasingly complex compliance challenges and potentially elevate our costs.

Complying with these jurisdictional requirements could increase the costs and complexity of compliance, and violations of applicable data protection laws can result in significant penalties. For example, the GDPR applies to activities regarding personal data that may be conducted by us, directly or indirectly through business partners. Failure to comply could result in significant penalties of up to a maximum of 4% of our global turnover that may materially adversely affect our business, reputation, results of operations, and cash flows. Similarly, the CCPA, which came into effect on January 1, 2020, imposes specific obligations on businesses that collect personal data from California residents and provides California residents specific rights in relation to their personal data that we or our business partners collect and use. As interpretation and enforcement of the CCPA evolves, it creates a range of new compliance obligations, which could cause us to change our business practices, and carries the possibility for significant financial penalties for noncompliance that may materially adversely affect our business, reputation, results of operations, and cash flows.

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As noted above, we are also subject to the possibility of information security breaches, which themselves may result in a violation of these data protection laws. Additionally, if we acquire a company that has violated or is not in compliance with applicable data protection laws, we may incur significant liabilities and penalties as a result.

Risks Inherent in an Investment in Us

The amount of cash we have available for distribution to holders of our units depends primarily on our cash flows rather than on our profitability, which may prevent us from making distributions, even during periods in which we record net income.

The amount of cash we have available for distribution depends primarily upon our cash flows and not solely on profitability, which will be affected by non-cash items. Although we have not made a distribution on our common units or Series A Preferred Units since we announced suspension of those distributions on May 3, 2020, and we do not expect to pay distributions on the common units or Series A Preferred Units in the foreseeable future, absent a material change to our business, we may, as a result, be unable to make cash distributions during periods when we report net income for GAAP purposes.

The market price of our common units may fluctuate significantly and, due to limited daily trading volumes, an investor could lose all or part of its investment in us.

An investor may not be able to resell its common units at or above its acquisition price. Additionally, limited liquidity may result in wide bid-ask spreads, contribute to significant fluctuations in the market price of the common units and limit the number of investors who are able to buy the common units.

The market price of our common units may decline and be influenced by many factors, some of which are beyond our control, including among others:

•our quarterly distributions, if any;

•our quarterly or annual earnings or those of other companies in our industry;

•developments relating to the strategic review process or market speculation regarding any such developments;

•the loss of a large customer;

•announcements by our customers or others regarding our customers or changes in our customers’ credit ratings, liquidity position, leverage profile and/or other financial or credit-related metrics;

•announcements by our competitors of significant contracts or acquisitions;

•changes in accounting standards, policies, guidance, interpretations or principles;

•general economic and geopolitical conditions;

•the failure of securities analysts to cover our common units or changes in financial estimates by analysts; and

•other factors described in these Risk Factors.

Our Partnership Agreement replaces our General Partner’s fiduciary duties to unitholders and those of our officers and directors with contractual standards governing their duties.

Our Partnership Agreement contains provisions that eliminate fiduciary duties to which our General Partner and its officers and directors would otherwise be held by state fiduciary duty law and replaces those duties with several different contractual standards.

By purchasing a common unit, a common unitholder agrees to become bound by the provisions in the Partnership Agreement, including the provisions discussed above.

Our Partnership Agreement limits the liabilities of our General Partner and its officers and directors and the rights of our unitholders with respect to actions taken by our General Partner and its officers and directors that might otherwise constitute breaches of fiduciary duty.

Our Partnership Agreement contains provisions that limit the liability of our General Partner and the rights of our unitholders with respect to actions taken by our General Partner that might otherwise constitute breaches of fiduciary duty under state fiduciary duty law. For example, our Partnership Agreement provides that:

•whenever our General Partner makes a determination or takes, or declines to take, any other action in its capacity as our General Partner, our General Partner is required to make such determination, or take or decline to take such other action, in good faith, meaning that it subjectively believed that the decision was in our best interests, and

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those determinations and actions will not be subject to any other or different standard imposed by our Partnership Agreement, Delaware law, or any other law, rule or regulation, or at equity;

•our General Partner will not have any liability to us or our unitholders for decisions made in its capacity as a General Partner so long as such decisions are made in good faith;

•our General Partner and its officers and directors will not be liable for monetary damages to us, our limited partners or their assignees resulting from any act or omission unless there has been a final and non-appealable judgment entered by a court of competent jurisdiction determining that our General Partner or its officers and directors, as the case may be, acted in bad faith or engaged in fraud or willful misconduct or, in the case of a criminal matter, acted with knowledge that the conduct was criminal; and

•our General Partner will not be in breach of its obligations under the Partnership Agreement or its duties to us or our unitholders if a transaction with an affiliate or the resolution of a conflict of interest is:

i.approved by the Conflicts Committee, if established, although our General Partner is not obligated to seek such approval;

ii.approved by the vote of a majority of the outstanding common units, excluding any common units owned by our General Partner and its affiliates;

iii.on terms no less favorable to us than those generally being provided to or available from unrelated third parties; or

iv.fair and reasonable to us, taking into account the totality of the relationships among the parties involved, including other transactions that may be particularly favorable or advantageous to us.

In connection with a situation involving a transaction with an affiliate or a conflict of interest, any determination by our General Partner or the Conflicts Committee must be made in good faith. If an affiliate transaction or the resolution of a conflict of interest is not approved by our common unitholders or the Conflicts Committee and the Board of Directors determines that the resolution or course of action taken with respect to the affiliate transaction or conflict of interest satisfies either of the standards set forth in the final two subclauses above, then it will be presumed that, in making its decision, the Board of Directors acted in good faith, and in any proceeding brought by or on behalf of any limited partner or the partnership, the person bringing or prosecuting such proceeding will have the burden of overcoming such presumption.

Our Partnership Agreement restricts the voting rights of unitholders owning 20% or more of our common units.

Unitholders' voting rights are further restricted by a provision of our Partnership Agreement providing that any person or group that owns 20% or more of any class of units then outstanding cannot vote on any matter, other than our General Partner, its affiliates, their transferees and persons who acquired such units with the prior approval of the Board of Directors.

We may issue additional units without unitholder approval, which would dilute existing ownership interests.

Except in the case of the issuance of units that rank equal to or senior to the Series A Preferred Units, our Partnership Agreement does not limit the number of additional limited partner interests, including limited partner interests that rank senior to the common units that we may issue at any time without the approval of our unitholders.

As of December 31, 2023, we have outstanding Series A Preferred Units having an issue price of less than $100.0 million. As a result, under our Partnership Agreement, we may now issue additional securities in parity with the Series A Preferred Units without any vote of the holders of the Series A Preferred Units (except where the cumulative distributions on the Series A Preferred Units or any parity securities are in arrears) and without the approval of holders of our common units.

The issuance by us of additional common units or other equity securities of equal or senior rank will decrease our existing unitholders' proportionate ownership interest in us. In addition, the issuance by us of additional common units or other equity securities of equal or senior rank may have the following effects:

•decreasing the amount of cash available for distribution on each unit;

•increasing the ratio of taxable income to distributions;

•diminishing the relative voting strength of each previously outstanding unit; and

•causing the market price of the common units to decline.

Future issuances and sales of parity securities, or the perception that such issuances and sales could occur, may cause prevailing market prices for our common units and the Series A Preferred Units to decline and may adversely affect our ability to raise additional capital in the financial markets at times and prices favorable to us.

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Furthermore, the payment of distributions on any additional units may increase the risk that we will not be able to make distributions at our prior per unit distribution levels. Although we have not made a distribution on our common units or Series A Preferred Units since we announced suspension of those distributions on May 3, 2020 and do not expect to pay distributions on the common units or Series A Preferred Units in the foreseeable future, to the extent new units are senior to our common units, including units issued to third parties at a subsidiary level, their issuance will increase the uncertainty of the payment of distributions on our common units.

Holders of Series A Preferred Units have limited voting rights, which may be diluted.

Although holders of the Series A Preferred Units are entitled to limited voting rights with respect to certain matters, the Series A Preferred Units generally vote separately as a class along with any other series of our parity securities that we may issue with like voting rights that have been conferred and are exercisable. As a result, the voting rights of holders of Series A Preferred Units may be significantly diluted, and the holders of such other series of parity securities that we may issue may be able to control or significantly influence the outcome of any vote.

Our General Partner has a limited call right that may require an investor to sell its units at an undesirable time or price.

If at any time our General Partner and its affiliates own more than 80% of our outstanding common units, our General Partner will have the right, which it may assign to any of its affiliates or to us, but not the obligation, to acquire all, but not less than all, of the common units held by unaffiliated persons at a price that is not less than their then-current market price, as calculated pursuant to the terms of our Partnership Agreement. As a result, an investor may be required to sell its common units at an undesirable time or price and may not receive any return on its investment. An investor may also incur a tax liability upon a sale of its units. The Partnership Agreement does not require our General Partner to obtain a fairness opinion regarding the value of the common units to be repurchased by it upon exercise of the limited call right. There is no restriction in our Partnership Agreement that prevents our General Partner from causing us to issue additional common units and then exercising its call right. If our General Partner exercised its limited call right, the effect would be to take us private and, if the units were subsequently deregistered, we would no longer be subject to the reporting requirements of the Exchange Act.

An investor's liability may not be limited if a court finds that unitholder action constitutes control of our business.

A General Partner of a partnership generally has unlimited liability for the obligations of the partnership, except for those contractual obligations of the partnership that are expressly made without recourse to the General Partner. Our partnership is organized under Delaware law, and we conduct business in a number of other states. The limitations on the liability of holders of limited partner interests for the obligations of a limited partnership have not been clearly established in some of the other states in which we do business. An investor could be liable for any and all of our obligations as if it was a General Partner if a court or government agency were to determine that:

•we were conducting business in a state but had not complied with that particular state's partnership statute; or

•an investor's right to act with other unitholders to remove or replace our General Partner, to approve some amendments to our Partnership Agreement or to take other actions under our Partnership Agreement constitute control of our business.

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Our Partnership Agreement designates the Court of Chancery of the State of Delaware as the exclusive forum for certain types of actions and proceedings that may be initiated by our unitholders, which limits our unitholders’ ability to choose the judicial forum for disputes with us or our General Partner’s directors, officers or other employees.

Our Partnership Agreement provides that, with certain limited exceptions, the Court of Chancery of the State of Delaware is the exclusive forum for any claims, suits, actions or proceedings (1) arising out of or relating in any way to our Partnership Agreement (including any claims, suits or actions to interpret, apply or enforce the provisions of our Partnership Agreement or the duties, obligations or liabilities among our partners, or obligations or liabilities of our partners to us, or the rights or powers of, or restrictions on, our partners or us), (2) brought in a derivative manner on our behalf, (3) asserting a claim of breach of a duty (including a fiduciary duty) owed by any of our, or our General Partner’s, directors, officers, or other employees, or owed by our General Partner, to us or our partners, (4) asserting a claim against us arising pursuant to any provision of the Delaware Revised Uniform Limited Partnership Act or (5) asserting a claim against us governed by the internal affairs doctrine. Any person or entity purchasing or otherwise acquiring any interest in our common units is deemed to have received notice of and consented to the foregoing provisions. This exclusive forum provision does not apply to a cause of action brought under federal or state securities laws. Although management believes this choice of forum provision benefits us by providing increased consistency in the application of Delaware law in the types of lawsuits to which it applies, the provision may have the effect of discouraging lawsuits against us and our General Partner’s directors and officers. The enforceability of similar choice of forum provisions in other companies’ certificates of incorporation or similar governing documents has been challenged in legal proceedings and it is possible that in connection with any action a court could find the choice of forum provisions contained in our Partnership Agreement to be inapplicable or unenforceable in such action. If a court were to find this choice of forum provision inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could adversely affect our financial position and results of operations.

Unitholders may have liability to repay distributions that were wrongfully distributed to them.

Under certain circumstances, unitholders may have to repay amounts wrongfully returned or distributed to them. Under Delaware law, we may not make a distribution if the distribution would cause our liabilities to exceed the fair value of our assets. Delaware law provides that for a period of three years from the date of an impermissible distribution, limited partners who received the distribution and who knew at the time of the distribution that it violated Delaware law will be liable to the limited partnership for the distribution amount. Substituted limited partners are liable both for the obligations of the assignor to make contributions to the partnership that were known to the substituted limited partner at the time it became a limited partner and for those obligations that were unknown if the liabilities could have been determined from the Partnership Agreement. Neither liabilities to partners on account of their partnership interest nor liabilities that are non-recourse to the partnership are counted for purposes of determining whether a distribution is permitted.

If an investor is not an eligible holder, it may not receive distributions or allocations of income or loss on those common units and those common units will be subject to redemption.

We have adopted certain requirements regarding those investors who may own our common units and Series A Preferred Units. Eligible holders are U.S. individuals or entities subject to U.S. federal income taxation on the income generated by us or entities not subject to U.S. federal income taxation on the income generated by us, so long as all of the entity's owners are U.S. individuals or entities subject to such taxation. If an investor is not an eligible holder, our General Partner may elect not to make distributions or allocate income or loss on that investor's units, and it runs the risk of having its units redeemed by us at the lower of purchase price cost or the then-current market price. The redemption price may be paid in cash or by delivery of a promissory note, as determined by our General Partner.

Our Series A Preferred Units and Subsidiary Series A Preferred Units have rights, preferences and privileges that are not held by, and are preferential to the rights of, holders of our common units.

The Series A Preferred Units rank senior to our common units with respect to distribution rights and rights upon liquidation. These preferences could adversely affect the market price for our common units or could make it more difficult for us to sell our common units in the future.

In addition, (i) prior to December 15, 2022, distributions on the Series A Preferred Units accumulated and were cumulative at the rate of 9.50% per annum of $1,000, the liquidation preference of the Series A Preferred Units and (ii) on and after December 15, 2022, distributions on the Series A Preferred Units accumulate for each distribution period at a percentage of $1,000 equal to the three-month LIBOR plus a spread of 7.43%. During the fourth quarter of 2023, distributions on the Series A Preferred Units began to accumulate at a rate equal to the three-month SOFR plus a spread of 7.69%. We have not made a distribution on our common units or Series A Preferred Units since we announced suspension of those distributions on May 3, 2020 and do not expect to pay distributions on the common units or Series A Preferred Units in the foreseeable future, absent a

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material change to our business. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units was $33.0 million. Unpaid distributions on the Series A Preferred Units will continue to accrue.

In addition, our Subsidiary Series A Preferred Units issued by Permian Holdco have priority over the common unitholders with respect to the cash flow from Permian Holdco. The distribution rate of the Subsidiary Series A Preferred Units is 7.00% per annum of the $1,000 issue amount per outstanding Subsidiary Series A Preferred Unit. Permian Holdco had the option to pay this distribution in-kind until the first quarter of 2022, which was the first full quarter following the date the Double E Pipeline was placed in service. The Partnership elected to pay distributions in-kind during 2022, 2021 and 2020, except for the periods ended September 30, 2022 and December 31, 2022 in which it made cash distributions. The Partnership did not pay any distributions in-kind during 2023.

Our obligation to pay distributions on our Series A Preferred Units and Permian Holdco’s obligation to pay the distributions on the Subsidiary Series A Preferred Units could impact our liquidity and reduce the amount of cash flow available for working capital, capital expenditures, growth opportunities, acquisitions, and other general partnership purposes. Our obligations to the holders of the Series A Preferred Units and Permian Holdco’s obligations to the holders of the Subsidiary Series A Preferred Units could also limit our ability to obtain additional financing or increase our borrowing costs, which could have an adverse effect on our financial condition.

Our Series A Preferred Units contain covenants that may limit our business flexibility.

Our Series A Preferred Units contain covenants preventing us from taking certain actions without the approval of the holders of 66 2/3% of the Series A Preferred Units. The need to obtain the approval of holders of the Series A Preferred Units before taking these actions could impede our ability to take certain actions that management or the Board of Directors may consider to be in the best interests of our unitholders. The affirmative vote of 66 2/3% of the outstanding Series A Preferred Units, voting as a single class, is necessary to amend the Partnership Agreement in any manner that would have a material adverse effect on the existing preferences, rights, powers, duties or obligations of the Series A Preferred Units. The affirmative vote of 66 2/3% of the outstanding Series A Preferred Units and any outstanding series of other preferred units, voting as a single class, is necessary to (A) under certain circumstances, create or issue certain equity securities that are senior to our common units, (B) declare or pay any distribution to common unitholders out of capital surplus or (C) take any action that would result in an event of default for failure to comply with any covenant in the indentures governing the Senior Notes co-issued by Summit Holdings and its 100% owned finance subsidiary, Finance Corp.

Although holders of the Series A Preferred Units are entitled to limited voting rights with respect to certain matters, the Series A Preferred Units generally vote as a class, separate from our common unitholders, along with any other series of our parity securities that we may issue upon which like voting rights have been conferred and are exercisable.

Tax Risks

Our tax treatment depends on our status as a partnership for federal income tax purposes. If the IRS were to treat us as a corporation for federal income tax purposes, which would subject us to entity-level taxation, then our cash available for distribution to our unitholders would be substantially reduced.

The anticipated after-tax economic benefit of an investment in our units depends largely on our being treated as a partnership for federal income tax purposes.

Despite the fact that we are a limited partnership under Delaware law, it is possible in certain circumstances for a partnership such as ours to be treated as a corporation for federal income tax purposes. A change in our business or a change in current law could cause us to be treated as a corporation for federal income tax purposes or otherwise subject us to taxation as an entity.

If we were treated as a corporation for federal income tax purposes, we would pay federal income tax on our taxable income at the corporate tax rate, which is currently 21%, and would likely pay state and local income tax at varying rates. Distributions to our unitholders would generally be taxed again as corporate dividends (to the extent of our current and accumulated earnings and profits), and no income, gains, losses, deductions, or credits would flow through to our unitholders. Because a tax would be imposed upon us as a corporation, our cash available for distribution would be substantially reduced. Therefore, if we were treated as a corporation for federal income tax purposes, there would be material reductions in the anticipated cash flow and after-tax return to our unitholders, likely causing a substantial reduction in the value of our units. This could adversely affect our financial position, results of operations and ability to make distributions to our unitholders.

Our unitholders are required to pay income taxes on their share of our taxable income, which may be substantial, even if they do not receive any cash distributions from us. A unitholder’s share of our taxable income may be affected by a variety of factors, including our economic performance and transactions in which we engage.

A unitholder’s allocable share of our taxable income will be taxable to it, which may require the unitholder to pay federal income taxes and, in some cases, state and local income taxes, even if the unitholder receives no cash distributions from us.

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For example, we have not paid a distribution on our common units since 2020, but we have allocated substantial amounts of taxable income and tax depreciation to our unitholders each year, though the precise amount has varied significantly depending upon when the unitholder acquired the units and the price paid for the units.

A unitholder’s share of our taxable income, and its relationship to any distributions we make, may be affected by a variety of factors, including our economic performance, which may be affected by numerous business, economic, regulatory, legislative, competitive and political uncertainties beyond our control, and certain transactions in which we might engage. For example, we may engage in transactions that produce substantial taxable income allocations to some or all of our unitholders without a corresponding increase in cash distributions to our unitholders, such as a sale or exchange of assets, the proceeds of which are reinvested in our business or used to reduce our debt, or an actual or deemed satisfaction of our indebtedness for an amount less than the adjusted issue price of the debt. A unitholder’s ratio of its share of taxable income to the cash received by it may also be affected by changes in law.

In 2020, we engaged in transactions that generated substantial COD income on a per unit basis relative to the trading price of our common units. We may engage in other transactions that result in substantial COD income or other substantial gains, such as gains upon asset sales, in the future, and such events may cause a unitholder to be allocated substantial income with respect to our units with no corresponding distribution of cash to fund the payment of the resulting tax liability to the unitholder.

A unitholder’s share of our taxable income will include any COD income recognized upon the satisfaction of our outstanding indebtedness for total consideration less than the adjusted issue price (and any accrued but unpaid interest) of such indebtedness. In 2020, we engaged in various liability management transactions that resulted in substantial COD income. We may engage in other transactions that result in substantial COD income or other substantial gains, such as gains upon asset sales, in the future. Depending upon the net amount of other items related to our loss (or income) allocable to a unitholder, any COD income or other gains (including from an asset sale) may cause a unitholder to be allocated substantial income with respect to our units with no corresponding distribution of cash to fund the payment of the resulting tax liability to the unitholder. Furthermore, such COD income event or other gain event may not be fully offset, either now or in the future, by capital losses, which are subject to significant limitations, or other losses. Accordingly, a COD income event or other gain event could cause a unitholder to realize taxable income without corresponding future economic benefits or offsetting tax deductions.

If we were subjected to a material amount of additional entity-level taxation by individual states, it would reduce our cash available for distribution to our unitholders.

Changes in current state law may subject us to additional entity-level taxation by individual states. Because of widespread state budget deficits and other reasons, several states are evaluating ways to subject partnerships to entity-level taxation through the imposition of state income, franchise and other forms of taxation. Imposition of any such taxes may substantially reduce the cash available for distribution.

The tax treatment of publicly traded partnerships or an investment in our units could be subject to potential legislative, judicial or administrative changes and differing interpretations of applicable law, possibly on a retroactive basis.

The present U.S. federal income tax treatment of publicly traded partnerships, including us, or an investment in our units may be modified by administrative, legislative or judicial changes or differing interpretations at any time. From time to time, the President and members of the U.S. Congress propose and consider substantive changes to the existing federal income tax laws that affect publicly traded partnerships, including proposals that would eliminate our ability to quality for partnership tax treatment. Further, while unitholders of publicly traded partnerships are, subject to certain limitations, entitled to a deduction equal to 20% of their allocable share of a publicly traded partnership’s “qualified business income,” this deduction is scheduled to expire with respect to taxable years beginning after December 31, 2025.

Any modification to the U.S. federal income tax laws and interpretations could make it more difficult or impossible to meet the exception for us to be treated as a partnership for U.S. federal income tax purposes. We are unable to predict whether any such changes will ultimately be enacted, but it is possible that a change in law could affect us and may, if enacted, be applied retroactively. Any such changes could negatively impact the value of an investment in our units.

Unitholders may be subject to limitation on their ability to deduct interest expense incurred by us.

In general, we are entitled to a deduction for interest paid or accrued on indebtedness properly allocable to our trade or business during our taxable year. However, our deduction for “business interest” is limited to the sum of our business interest income and 30% of our “adjusted taxable income.” For purposes of this limitation, our adjusted taxable income is computed without regard to any business interest expense or business interest income. In the case of taxable years beginning January 1, 2022, our adjusted taxable income is computed by taking into account any deduction allowable for depreciation, amortization, or depletion. Our deduction for “business interest” is significantly limited by these rules, and as a result, the amount of taxable

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income allocated to our unitholders is increased. Prospective unitholders should consult their tax advisors regarding the impact of this business interest deduction limitation on an investment in our common units.

Tax gain or loss on the disposition of our units could be more or less than expected.

If a unitholder sells its units, a gain or loss will be recognized for federal income tax purposes equal to the difference between the amount realized and the unitholder's tax basis in those units. Because distributions in excess of a unitholder's allocable share of its net taxable income decrease its tax basis in its units, the amount, if any, of such prior excess distributions with respect to the units it sells will, in effect, become taxable income to the unitholder if it sells such units at a price greater than its tax basis in those units, even if the price it receives is less than its original cost.

Furthermore, a substantial portion of the amount realized on any sale or other disposition of a unitholder's units may be taxed as ordinary income due to potential recapture items, including depreciation recapture. Such ordinary income may exceed net taxable gain realized on the sale of a unit and may be recognized even if there is a net taxable loss realized on the sale of a unit. Thus, a unitholder may recognize both ordinary income and capital gain or loss upon a sale of units. In addition, because the amount realized includes a unitholder's share of our nonrecourse liabilities, if a unitholder sells its units, it may incur a tax liability in excess of the amount of cash it receives from the sale.

If the IRS contests the federal income tax positions we take, the market for our units may be adversely impacted and the cost of any IRS contest would likely reduce our cash available for distribution to our unitholders.

The IRS may adopt positions that differ from the conclusions of our counsel expressed in a prospectus or from the positions we take, and the IRS's positions may ultimately be sustained. It may be necessary to resort to administrative or court proceedings to sustain some or all of our counsel’s conclusions or the positions we take and such positions may not ultimately be sustained. A court may not agree with some or all of our counsel’s conclusions or the positions we take. Any contest with the IRS, and the outcome of any IRS contest, may have a materially adverse effect on the market for our units and the price at which they trade. In addition, our costs of any contest with the IRS would be borne indirectly by our unitholders because the costs would likely reduce our cash available for distribution.

Tax-exempt entities and non-U.S. persons face unique tax issues from owning our units that may result in adverse tax consequences to them.

Investment in our units by tax-exempt entities, such as employee benefit plans and individual retirement accounts (“IRAs”), and non-U.S. persons raises issues unique to them. For example, virtually all of our income allocated to an organization that is exempt from federal income tax, including IRAs and other retirement plans, will be unrelated business taxable income (“UBTI”) and will be taxable to the exempt organization as UBTI on the exempt organization’s tax return in the year the exempt organization is allocated the income. An exempt organization is required to independently compute its UBTI from each separate unrelated trade or business which may prevent an exempt organization from utilizing losses we allocate to the organization against the organization’s UBTI from other sources and vice versa. Distributions to non-U.S. persons will be reduced by withholding taxes at the highest applicable effective tax rate, and non-U.S. persons will be required to file federal income tax returns and applicable state tax returns and pay tax on their share of our taxable income.

Non-U.S. unitholders are generally taxed and subject to income tax filing requirements by the United States on income effectively connected with a U.S. trade or business. Income allocated to our unitholders and any gain from the sale of our units will generally be considered to be “effectively connected” with a U.S. trade or business. As a result, distributions to a non-U.S. unitholder will be subject to withholding at the highest applicable effective tax rate and a non-U.S. unitholder who sells or otherwise disposes of a unit will also be subject to U.S. federal income tax on the gain realized from the sale or disposition of that unit.

In addition to the withholding tax imposed on distributions of effectively connected income, distributions to a non-U.S. unitholder will also be subject to a 10% withholding tax on the amount of any distribution in excess of our cumulative net income. As we do not compute our cumulative net income for such purposes due to the complexity of the calculation and lack of clarity in how it would apply to us, we intend to treat all of our distributions as being in excess of our cumulative net income for such purposes and subject to such 10% withholding tax. Accordingly, distributions to a non-U.S. unitholder will be subject to a combined withholding tax rate equal to the sum of the highest applicable effective tax rate and 10%.

Additionally, if a unitholder sells or otherwise disposes of a unit, the transferee is required to withhold 10.0% of the amount realized by the transferor unless the transferor certifies that it is not a foreign person, and we are required to deduct and withhold from the transferee amounts that should have been withheld by the transferee but were not withheld. Under the Treasury Regulations, such withholding will be required on open market transactions, but in the case of a transfer made through a broker, a partner’s share of liabilities will be excluded from the amount realized. In addition, the obligation to withhold will be imposed on the broker instead of the transferee (and we will generally not be required to withhold from the transferee amounts that should have been withheld by the transferee but were not withheld). These withholding obligations will apply to

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transfers of our common units occurring on or after January 1, 2023. Current and prospective non-U.S. unitholders should consult their tax advisors regarding the impact of these rules on an investment in our common units.

We treat each holder of our common units as having the same tax benefits without regard to the actual common units held. The IRS may challenge this treatment, which could adversely affect the value of the common units.

Because we cannot match transferors and transferees of common units and because of other reasons, we will adopt depreciation and amortization positions that may not conform to all aspects of existing Treasury Regulations. A successful IRS challenge to those positions could adversely affect the amount of tax benefits available to our unitholders. A successful IRS challenge also could affect the timing of these tax benefits or the amount of gain from a unitholder’s sale of common units and could have a negative impact on the value of our common units or result in audit adjustments to the unitholder’s tax returns.

Treatment of distributions on our Series A Preferred Units as guaranteed payments for the use of capital creates a different tax treatment for the holders of our Series A Preferred Units than the holders of our common units and such distributions are not eligible for the 20% deduction for qualified publicly traded partnership income.

The tax treatment of distributions on our Series A Preferred Units is uncertain. We will treat the holders of Series A Preferred Units as partners for tax purposes and will treat distributions on the Series A Preferred Units as guaranteed payments for the use of capital that will generally be taxable to the holders of Series A Preferred Units as ordinary income. A holder of Series A Preferred Units may recognize taxable income from the accrual of such a guaranteed payment even in the absence of a contemporaneous distribution, and we anticipate accruing the guaranteed payment distributions quarterly on the 15th day of March, June, September and December. Because the guaranteed payment for each unit must accrue as income to a holder during the taxable year of the accrual, the guaranteed payment attributable to the period beginning December 15th and ending December 31st will accrue to the holder of record of a Series A Preferred Unit on December 31st for such period. Otherwise, except in the case of our liquidation, the holders of Series A Preferred Units are generally not anticipated to share in our items of income, gain, loss or deduction. We will not allocate any share of its nonrecourse liabilities to the holders of Series A Preferred Units.

Treasury Regulations provide that a guaranteed payment for the use of capital generally is not taken into account for purposes of computing qualified business income for purposes of the 20% deduction for qualified publicly traded partnership will not constitute an allocable or distributive share of such income. As a result, the guaranteed payment for use of capital received by holders of our Series A Preferred Units may not be eligible for the 20% deduction for qualified publicly traded partnership income.

A holder of Series A Preferred Units will be required to recognize gain or loss on a sale of units equal to the difference between the holder’s amount realized and tax basis in the units sold. The amount realized generally will equal the sum of the cash and the fair market value of other property such holder receives in exchange for such Series A Preferred Units. Subject to general rules requiring a blended basis among multiple partnership interests, the tax basis of a Series A Preferred Unit will generally be equal to the sum of the cash and the fair market value of other property paid by the holder to acquire such Series A Preferred Unit. Gain or loss recognized by a holder on the sale or exchange of a Series A Preferred Unit held for more than one year generally will be taxable as long-term capital gain or loss. Because holders of Series A Preferred Units will not generally be allocated a share of our items of depreciation, depletion or amortization, it is not anticipated that such holders would be required to recharacterize any portion of their gain as ordinary income as a result of the recapture rules.

Investment in the Series A Preferred Units by tax-exempt investors, such as employee benefit plans and IRAs, and non-U.S. persons raises issues unique to them. Although the issue is not free from doubt, we will treat distributions to non-U.S. holders of the Series A Preferred Units as “effectively connected income” (which will subject holders to U.S. net income taxation and possibly the branch profits tax) that are subject to withholding taxes imposed at the highest effective tax rate applicable to such non-U.S. holders. If the amount of withholding exceeds the amount of U.S. federal income tax actually due, non-U.S. holders may be required to file U.S. federal income tax returns in order to seek a refund of such excess. The treatment of guaranteed payments for the use of capital to tax-exempt investors is not certain and such payments may be treated as unrelated business taxable income for federal income tax purposes.

All holders of our Series A Preferred Units are urged to consult a tax advisor with respect to the consequences of owning our Series A Preferred Units.

We prorate our items of income, gain, loss and deduction for U.S, federal income tax purposes between transferors and transferees of our units each month based upon the ownership of our units on the first day of each month, instead of on the basis of the date a particular unit is transferred. The IRS may challenge this treatment, which could change the allocation of items of income, gain, loss and deduction among our unitholders.

We prorate our items of income, gain, loss and deduction for U.S. federal income tax purposes between transferors and transferees of our units each month based upon the ownership of our units on the first day of each month, instead of on the basis

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of the date a particular unit is transferred. Treasury Regulations allow a similar monthly simplifying convention, but do not specifically authorize the use of the proration method we have adopted. If the IRS were to challenge our proration method, or if new Treasury Regulations were issued, we may be required to change the allocation of items of income, gain, loss and deduction among our unitholders.

A unitholder whose units are loaned to a “short seller” to cover a short sale of units may be considered as having disposed of those units. If so, the unitholder would no longer be treated for federal income tax purposes as a partner with respect to those units during the period of the loan and may recognize gain or loss from the disposition.

Because a unitholder whose units are loaned to a “short seller” to cover a short sale of units may be considered as having disposed of the loaned units, the unitholder may no longer be treated for federal income tax purposes as a partner with respect to those units during the period of the loan to the short seller and the unitholder may recognize gain or loss from such disposition. Moreover, during the period of the loan to the short seller, any of our income, gain, loss or deduction with respect to those units may not be reportable by the unitholder and any cash distributions received by the unitholder as to those units could be fully taxable as ordinary income. Therefore, unitholders desiring to assure their status as partners and avoid the risk of gain recognition from a loan to a short seller are urged to consult a tax advisor to discuss whether it is advisable to modify any applicable brokerage account agreements to prohibit their brokers from loaning their units.

We have adopted certain valuation methodologies and monthly conventions for U.S. federal income tax purposes that may result in a shift of income, gain, loss and deduction among our unitholders. The IRS may challenge this treatment, which could adversely affect the value of our units.

When we issue additional units or engage in certain other transactions, we will determine the fair market value of our assets. Although we may from time to time consult with professional appraisers regarding valuation matters, we make many fair market value estimates using a methodology based on the market value of our units as a means to measure the fair market value of our assets. The IRS may challenge these valuation methods and the resulting allocations of income, gain, loss and deduction.

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

If the IRS makes audit adjustments to our income tax returns, the IRS (and some states) may collect any resulting taxes (including any applicable penalties and interest) resulting from such audit adjustment directly from us, in which case we may require our unitholders and former unitholders to reimburse us for such taxes (including any applicable penalties or interest) or, if we are required to bear such payment, our cash available for distribution to our unitholders could be substantially reduced.

If the IRS makes audit adjustments to our income tax returns, it may collect any resulting taxes (including any applicable penalties and interest) directly from us. We will generally have the ability to shift any such tax liability to our unitholders in accordance with their interests in us during the year under audit, but there can be no assurance that we will be able to do so (and will choose to do so) under all circumstances, or that we will be able to (or choose to) effect corresponding shifts in state income or similar tax liability resulting from the IRS adjustment in states in which we do business in the year under audit or in the adjustment year. If, we make payments of taxes, penalties and interest resulting from audit adjustments, we may require our unitholders and former unitholders to reimburse us for such taxes (including any applicable penalties or interest) or, if we are required to bear such payment, our cash available for distribution to our unitholders could be substantially reduced. Additionally, we may be required to allocate an adjustment disproportionately among our unitholders, causing the publicly traded units to have different capital accounts, unless the IRS issues further guidance.

In the event the IRS makes an audit adjustment to our income tax returns and we do not or cannot shift the liability to our unitholders in accordance with their interests in us during the year under audit, we will generally have the ability to request that the IRS reduce the determined underpayment by reducing the suspended passive loss carryovers of our unitholders (without any compensation from us to such unitholders), to the extent such underpayment is attributable to a net decrease in passive activity losses allocable to certain partners. Such reduction, if approved by the IRS, will be binding on any affected unitholders.

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As a result of investing in our units, our unitholders will likely be subject to state and local taxes and return filing requirements in jurisdictions where we operate or own or acquire properties.

In addition to federal income taxes, our unitholders will likely be subject to other taxes, including state and local taxes, unincorporated business taxes and estate, inheritance or intangible taxes that are imposed by the various jurisdictions in which we conduct business or control property now or in the future, even if the unitholders do not live in any of those jurisdictions. Our unitholders will likely be required to file state and local income tax returns and pay state and local income taxes in some or all of these various jurisdictions. Further, our unitholders may be subject to penalties for failure to comply with those requirements. Some of the states in which we conduct business currently impose a personal income tax on individuals. As we make acquisitions or expand our business, we may control assets or conduct business in additional states that impose a personal income tax. It is the unitholder's responsibility to file all federal, state and local tax returns.

Compliance with and changes in tax laws could adversely affect our performance.

We are subject to extensive tax laws and regulations, including federal and state income taxes and transactional taxes such as excise, sales/use, payroll, franchise and ad valorem taxes. New tax laws and regulations and changes in existing tax laws and regulations are continuously being enacted that could result in increased tax expenditures in the future. Many of these tax liabilities are subject to audits by the respective taxing authority. These audits may result in additional taxes as well as interest and penalties.

Risks Related to Terrorism and Cyberterrorism

Terrorist attacks and threats, escalation of military activity in response to these attacks, or acts of war could have a material adverse effect on our business, financial condition or results of operations.

Terrorist attacks and threats, escalation of military activity, or acts of war may have significant effects on general economic conditions, fluctuations in consumer confidence and spending and market liquidity, each of which could materially and adversely affect our business. Future terrorist attacks, rumors or threats of war, actual conflicts involving the United States or its allies, or military or trade disruptions may significantly affect our operations and those of our customers. Strategic targets, such as energy-related assets, may be at greater risk of future attacks than other targets in the United States. Disruption or significant increases in energy prices could result in government-imposed price controls. It is possible that any of these occurrences, or a combination of them, could have a material adverse effect on our business, financial condition and results of operations. Our insurance may not protect us against such occurrences.

Our operations depend on the use of information technology (“IT”) and operational technology (“OT”) systems that could be the target of a cyberattack.

The oil and gas industry has become increasingly dependent on digital technologies to conduct day-to-day operations, including certain midstream activities. For example, software programs are used to manage gathering and transportation systems and for compliance reporting. The use of remote communication devices has increased rapidly. Industrial control systems now control large scale processes that can include multiple sites and long distances, such as oil and gas pipelines.

Our operations depend on the use of sophisticated IT and OT systems. These systems, as well as those of our customers, business partners and counterparties, may become the target of cyber-attacks or information security breaches. Additionally, increased remote access to information systems by employees and contractors can increase exposure to potential cybersecurity incidents.

Any such cyber-attacks or information security breaches could have a material adverse effect on our revenues and increase our operating and capital costs and could reduce the amount of cash otherwise available for distribution. A cyber-incident involving our IT or OT systems, or that of our customers, business partners or counterparties, could disrupt our business plans and negatively impact our operations in the following ways, among others:

•a cyber-attack on a vendor or service provider could result in supply chain disruptions, which could delay or halt development of additional infrastructure, effectively delaying the start of cash flows from the project;

•a cyber-attack on downstream pipelines could prevent us from delivering product at the tailgate of our facilities, resulting in a loss of revenues;

•a cyber-attack on a communications network or power grid could cause operational disruption, resulting in loss of revenues;

•a deliberate corruption of our financial or operational data could result in events of non-compliance, which could lead to regulatory fines or penalties; and

•business interruptions could result in expensive remediation efforts, distraction of management, damage to our reputation or a negative impact on the price of our units.

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Cyber-incidents and related business interruptions could result in expensive remediation efforts, distraction of management, damage to our reputation or a negative impact on the price of our units. In addition, certain cyberattacks and related incidents, such as reconnaissance or surveillance by threat actors, may remain undetected for an extended period notwithstanding our monitoring and detection efforts. As a result, we may be required to incur additional costs to modify or enhance our IT or OT systems to prevent or remediate any such attacks. Finally, laws and regulations governing cybersecurity pose increasingly complex compliance challenges, and failure to comply with these laws could result in penalties and legal liability.

Item 1B. Unresolved Staff Comments.

Not applicable.

Item 1C. Cybersecurity Risk Management, Strategy and Governance.

Cybersecurity Oversight and Management

Board Oversight of Cybersecurity Matters

The Audit Committee is tasked with overseeing the Partnership’s cybersecurity matters. Pursuant to the Audit Committee’s charter, one of the Audit Committee’s responsibilities is to discuss the Partnership’s major risk exposures with management, including those related to cybersecurity, and the steps taken by management to monitor and control such exposures, including the Partnership’s risk assessment and risk management guidelines, policies and practices.

The Audit Committee reports to the entire Board of Directors periodically regarding its oversight of cybersecurity matters. In developing such updates to the Board of Directors, the Audit Committee relies in large part on periodic updates from Partnership management.

Management of Cybersecurity Matters

The Partnership’s management assumes executive responsibility for assessing, identifying, and managing cybersecurity risks and incidents.

In particular, the Senior Vice President, Engineering and Operations (SVP, E&O) reports directly to the President, Chief Executive Officer, and Chairman of the Board and holds the highest level of executive responsibility for assessing and managing all cybersecurity threats, incidents, and risks at the Partnership, as well as developing and implementing all cybersecurity risk management, strategy, and governance recommendations.

The SVP, E&O holds key skills, experience, and competencies related to the management of cybersecurity matters. In particular, our current SVP, E&O has over 30 years of experience leading IT and OT physical security and cybersecurity.

The SVP, E&O is supported by critical internal positions within the Partnership, including but not limited to the Director of Information Technology, Vice President of Operational Technology and dedicated IT and OT resources with cybersecurity responsibilities. The SVP, E&O is further supported by various external parties, including but not limited to cybersecurity service providers, consultants, and other third parties engaged on an as-needed basis.

The Partnership’s management has processes in place by which it is informed of and monitors the prevention, detection, mitigation, and remediation of cybersecurity risks. These processes include, but are not limited to:

•Maintaining an updated inventory and management of digital assets;

•Ensuring familiarity and compliance with cybersecurity frameworks, including the National Institute of Standards and Technology’s Cybersecurity Framework and ISO 27001;

•Updating and maintaining an internal incident response plan;

•Conducting risk assessments of the Partnership’s cybersecurity policies, practices, and tools;

•Employing appropriate antivirus, anti-malware, firewall, endpoint detection and response, backup and recovery software, multifactor authentication, virtual private network, account change monitoring, patch management, web content filter, spam filter and reporting, and vulnerability management software;

•Conducting regular vulnerability scans of the Partnership’s digital and operational infrastructure;

•Requiring employees to complete a Cybersecurity Awareness Program, which includes computer-based training; and

•Reviewing and evaluating developments in the threat landscape.

The Partnership’s management also has processes in place to oversee and identify material risks from cybersecurity threats associated with its use of third-party service providers. These processes include, but are not limited to:

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•Maintaining an inventory of all third-party vendors engaged by the Partnership and assessing each vendor’s level of access to the Partnership’s IT and OT systems and information; and

•Implementing access controls that restrict vendor access to only specific Partnership systems and information necessary to perform their service.

The SVP, E&O provides updates to the Audit Committee at its quarterly meetings regarding management of the Partnership’s cybersecurity matters, including any new cybersecurity threats, incidents, risks, risk management solutions, trainings or education, infrastructure upgrades, or governance changes.

As of March 15, 2024, the Partnership’s business strategy, operations, or financial condition have not been materially affected by and are not likely to be materially affected by, any cybersecurity threats or incidents.

Item 2. Properties.

A description of our properties is included in Item 1. Business, and is incorporated herein by reference. For additional information on our midstream assets and their capacities, see Item 1. Business.

Our real property falls into two categories: (i) parcels that we own in fee and (ii) parcels in which our interest derives from leases, easements, rights-of-way, permits or licenses from landowners or governmental authorities, permitting the use of such land for our operations. Portions of the land on which our gathering systems and other major facilities are located are owned by us in fee title, and we believe that we have valid title to these lands. The remainder of the land on which our major facilities are located are held by us pursuant to long-term leases or easements between us and the underlying fee owner or permits with governmental authorities. We believe that we have valid leasehold estates or fee ownership in such lands or valid permits with governmental authorities. We have no knowledge of any material challenge to the underlying fee title of any material lease, easement, right-of-way, permit or license held by us or to our title to any material lease, easement, right-of-way, permit or license. We believe that we have satisfactory title to all of our material leases, easements, rights-of-way, permits and licenses with the exception of certain ordinary course encumbrances and permits with governmental entities that have been applied for, but not yet issued.

In addition, we lease various office space to support our operations.

Item 3. 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, we are not currently a party to any significant legal or governmental proceedings, except as noted below. In addition, we are not aware of any significant legal or governmental proceeding contemplated to be brought against us, under the various environmental protection statutes to which we are subject, except as noted below.

Fiberspar Corporation. On May 3, 2022, Fiberspar Corporation (“Fiberspar”) filed a petition in state court alleging, before costs and interest, over $5.0 million owed but not paid for orders of pipeline product from Fiberspar. The petition asserts causes of action for breach of contract and suit on sworn account. A civil action on the same claims had been filed by Fiberspar in 2016 but was dismissed without prejudice pursuant to a standstill and tolling agreement that expired in 2021. We filed an answer on September 6, 2022 denying Fiberspar’s claims and asserting counter claims. The case is pending in the District Court of Harris County, Texas. We are unable to predict the final outcome of this matter.

Global Settlement. On August 4, 2021, the Partnership and several of its subsidiaries entered into agreements to resolve government investigations into the previously disclosed 2015 Blacktail Release, from a pipeline owned and operated by Meadowlark Midstream, which at the time was a wholly owned subsidiary of Summit Investments, (together with Meadowlark Midstream, the “Companies”). The Companies entered into the following agreements to resolve the U.S. federal and North Dakota state governments’ environmental claims against the Companies with respect to the 2015 Blacktail Release: (i) a Consent Decree with (a) the DOJ, on behalf of the U.S. Environmental Protection Agency and the U.S. Department of Interior, and (b) the State of North Dakota, on behalf of the North Dakota Department of Environmental Quality and the North Dakota Game and Fish Department, lodged with the U.S. District Court; (ii) a Plea Agreement with the United States, by and through the U.S. Attorney for the District of North Dakota, and the Environmental Crimes Section of the DOJ; and (iii) a Consent Agreement with the North Dakota Industrial Commission (together, the “Global Settlement”).

The Consent Decree provides for, among other requirements and subject to the conditions therein, (i) payment of total civil penalties and reimbursement of assessment costs of $21.25 million, with the federal portion of penalties payable over up to five years and the state portion of penalties payable over up to, for the federal and state civil amounts, six years and, for the federal criminal amounts, five years, with interest accruing at, for the federal and state civil amounts, a fixed rate of 3.25% and, for the federal criminal amounts, a variable rate set by statute; (ii) continuation of remediation efforts at the site of the 2015 Blacktail Release; (iii) other injunctive relief including but not limited to control room management, an environmental management

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system audit, training, and reporting; and (iv) no admission of liability to the U.S. or North Dakota. The Consent Decree was entered by the U.S. District Court on September 28, 2021.

The Consent Agreement settles a complaint brought by the NDIC in an administrative action against the Companies for alleged violations of the North Dakota Administrative Code (“NDAC”) arising from the 2015 Blacktail Release on the following terms: (i) the Companies admit to three counts of violating the NDAC; (ii) the Companies agree to follow the terms and conditions of the Consent Decree, including payment of penalty and reimbursement amounts set forth in the Consent Decree; and (iii) specified conditions in the Consent Decree regarding operation and testing of certain existing produced water pipelines shall survive until those pipelines are properly abandoned.

Under the Plea Agreement, the Companies agreed to, among other requirements and subject to the conditions therein, (i) enter guilty pleas for one charge of negligent discharge of a harmful quantity of oil and one charge of knowing failure to immediately report a discharge of oil; (ii) sentencing that includes payment of a fine of $15.0 million plus mandatory special assessments over a period of up to five years with interest accruing at the federal statutory rate; (iii) organizational probation for a minimum period of three years from sentencing on December 6, 2021, which will include payment in full of certain components of the fines and penalty amounts; and (iv) compliance with the remedial measures in the Consent Decree.

On December 6, 2021, the U.S. District Court accepted the Plea Agreement. This Global Settlement resulted in losses amounting to $36.3 million and will be paid over five to six years, of which we have paid principal amounts of $14.7 million as of December 31, 2023.

Verdad Resources. Verdad Resources LLC (“Verdad”) filed a complaint in Colorado state court for the district of Weld County against Sterling Energy Investments LLC (“Sterling”), Golden Resources, Inc., and Grasslands Energy Marketing LLC (“Grasslands”) on October 20, 2022, and amended on December 6, 2022 to exclude Golden Resources, Inc. as a defendant. In connection with the 2022 DJ Acquisitions, Sterling and Grasslands became subsidiaries of the Partnership. The Partnership settled all claims with Verdad in February 2024 with no material impact to the Partnership.

Sage Natural Resources. In July 2022, the Partnership’s subsidiary DFW Midstream filed a petition in the District Court of Dallas County, Texas seeking payment, before costs and interest, of approximately $1.0 million in electric power costs for gathering services provided to Sage Natural Resources, LLC (“Sage”) in 2021-2022. Sage has denied the amounts are owed and has filed counterclaims seeking damages and other relief for DFW Midstream’s alleged breaches of the gathering agreement. The issues in this case arose from events in February 2021 impacting the oil and gas industry in the Barnett during Winter Storm Uri. A non-jury trial is currently scheduled for February 2024, and we are unable to predict the final outcome of this matter.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common units trade on the NYSE under the ticker symbol “SMLP”. As of December 31, 2023, there were approximately 6,583 common unitholders of record per our tax records.

We have not made a distribution on our common units or Series A Preferred Units since we announced a suspension of those distributions on May 3, 2020. We paid distributions in-kind on our Subsidiary Series A Preferred Units in 2020, 2021 and portions of 2022, and we did not pay any distributions in-kind in 2023. We paid cash distributions on our Subsidiary Series A Preferred Units totaling $6.5 million in 2023 and $3.3 million in 2022 and accrued an additional $1.6 million in 2023 which was subsequently paid in 2024.

Our Cash Distribution Policy and Restrictions on Distributions

General

Suspension of Distributions. On May 3, 2020, we suspended distributions to holders of our common units and suspended payments of distributions to holders of our Series A Preferred Units, commencing with respect to the quarter ending March 31, 2020. Because our Series A Preferred Units rank senior to our common units with respect to distribution rights, any accrued amounts on our Series A Preferred Units must first be paid prior to our resumption of distributions to our common unitholders. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units totaled $33.0 million. 

Absent a material change to our business, we do not expect to pay distributions to holders of our common units or Series A Preferred Units in the foreseeable future.

Our Cash Distribution Policy. Our Partnership Agreement requires us to distribute all of our available cash quarterly, subject to reserves established by our General Partner. Generally, our available cash is our (i) cash on hand at the end of a quarter after the payment of our expenses and the establishment of cash reserves and (ii) cash on hand resulting from working capital borrowings made after the end of the quarter. Because we are not subject to an entity-level federal income tax, we have more cash to distribute to our unitholders than would be the case were we subject to federal income tax.

If we resume distributions on the common units, we will pay our distributions on or about the 15th of each of February, May, August and November to holders of record on or about seven days prior to such distribution date, and we make the distribution on the business day immediately preceding the indicated distribution date if the distribution date falls on a holiday or non-business day.

The Board of Directors plans on making decisions with respect to payment of distributions on the common units and Series A Preferred Units on a semi-annual or quarterly basis, as applicable, based on the required payment date. However, we do not intend to pay distributions on the common units or Series A Preferred Units in the foreseeable future, absent a material change to our business, and there are restrictions in the agreements for our indebtedness limiting our ability to pay cash distributions on any of our equity securities.

Limitations on Cash Distributions and Our Ability to Change Our Cash Distribution Policy. There is no guarantee that our unitholders will receive quarterly distributions from us. We do not have a legal obligation to pay any distribution except to the extent we have available cash as defined in our Partnership Agreement. Our cash distribution policy may be changed at any time and is subject to certain restrictions, including the following:

•Our cash distribution policy is subject to restrictions on distributions under our ABL Facility and the indentures governing the Senior Notes. These agreements contain financial tests, excess cash flow sweep mechanisms, and covenants that we must satisfy. Should we be unable to satisfy these restrictions, we may be prohibited from making cash distributions notwithstanding our stated cash distribution policy.

•Our cash distribution policy is subject to restrictions on distributions under our Series A Preferred Units. Our Series A Preferred Units contain covenants that we must satisfy. Should we be unable to satisfy these restrictions, we may be prohibited from making cash distributions notwithstanding our stated cash distribution policy.

•Our General Partner has the authority to establish cash reserves for the prudent conduct of our business and for future cash distributions to our unitholders, and the establishment or increase of those cash reserves could result in a reduction in cash distributions to our unitholders from the levels we currently anticipate pursuant to our stated distribution policy. Any determination to establish cash reserves made by our General Partner in good faith will be binding on our unitholders.

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•Although our Partnership Agreement requires us to distribute all of our available cash, our Partnership Agreement, including the provisions requiring us to distribute all of our available cash, may be amended. We can amend our Partnership Agreement with the consent of our General Partner and the approval of a majority of the outstanding common units.

•Even if our cash distribution policy is not modified or revoked, the amount of distributions we pay under our cash distribution policy and the decision to make any distribution is determined by our General Partner, taking into consideration the terms of our Partnership Agreement.

•Under Delaware law, we may not make a distribution if the distribution would cause our liabilities to exceed the fair value of our assets.

•We may lack sufficient cash to pay distributions to our unitholders due to cash flow shortfalls attributable to a number of operational, commercial or other factors as well as increases in our operating or general and administrative expenses, principal and interest payments on our debt, tax expenses, working capital requirements and anticipated cash needs. Our cash available for distribution to unitholders is directly impacted by our cash expenses necessary to run our business and will be reduced dollar-for-dollar to the extent such uses of cash increase.

•If and to the extent our cash available for distribution materially declines, we may elect to reduce our quarterly distribution rate to service or repay our debt or fund expansion capital expenditures.

Preferred Unit Distributions

Series A Preferred Units

In November 2017, we issued 300,000 Series A Preferred Units at a price to the public of $1,000 per Series A Preferred Unit, and, as a result of exchange transactions completed in 2020, 2021 and 2022, the Partnership had 65,508 Series A Preferred Units outstanding as of December 31, 2023 and $33.0 million of accrued and unpaid distributions.

In May 2020, we suspended payments of distributions to holders of our Series A Preferred Units, and we did not make a distribution on our Series A Preferred Units in 2023 or 2022.

During the year ended December 31, 2022, we completed an offer to exchange our Series A Preferred Units for newly issued common units (the “2022 Preferred Exchange Offer”), whereby we issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units.

Distributions on the Series A Preferred Units are cumulative and compounding and are payable quarterly in arrears on the 15th day of March, June, September and December of each year (each, a “Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Distribution Payment Date, in each case, when, as, and if declared by the General Partner out of legally available funds for such purpose.

The initial distribution rate for the Series A Preferred Units was 9.50% per annum of the $1,000 liquidation preference per Series A Preferred Unit. Beginning December 15, 2022, distributions on the Series A Preferred Units accumulate for each distribution period at a percentage of the liquidation preference equal to the three-month LIBOR plus a spread of 7.43%. During the fourth quarter of 2023, distributions on the Series A Preferred Units began to accumulate at a rate equal to the three-month SOFR plus a spread of 7.69%. See Note 12 - Partners' Capital and Mezzanine Capital to the consolidated financial statements for additional details.

Subsidiary Series A Preferred Units

In December 2019 and during the year ended December 31, 2020, Permian Holdco issued 30,057 and 55,251 Subsidiary Series A Preferred Units, respectively, representing limited partner interests in Permian Holdco at a price of $1,000 per unit. During the year ended December 31, 2022, we elected to make PIK distributions and issued 1,600 Subsidiary Series A Preferred Units to the holders of the Subsidiary Series A Preferred Units. No PIK distributions were made during the year ended December 31, 2023.

As of December 31, 2023, we had 93,039 Subsidiary Series A Preferred Units outstanding, and during fiscal year ended December 31, 2023, we made $6.5 million of cash distributions to holders of the Subsidiary Series A Preferred Units and accrued an additional $1.6 million in 2023 which was subsequently paid in 2024. Additionally, we paid distributions in-kind on our Subsidiary Series A Preferred Units in 2020, 2021 and portions of 2022. We did not pay any distributions in-kind in 2023.

Distributions on the Subsidiary Series A Preferred Units are cumulative and compounding and are payable quarterly in arrears 21 days after the quarter ending March, June, September and December of each year (each, a “Subsidiary Series A Preferred Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Subsidiary Series A Preferred Distribution Payment Date, in each case, when, as, and if declared by the board of directors of Permian Holdco out of legally available funds for such purpose.

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The distribution rate is 7.00% per annum of the $1,000 issue amount per outstanding Permian Holdco Subsidiary Series A Preferred Unit. Permian Holdco had the option to pay this distribution in-kind until the first quarter of 2022, which is the first full quarter following the date the Double E Pipeline was placed in service. If the Subsidiary Series A Preferred Units were redeemed on December 31, 2023, the redemption amount would be $125.5 million, when considering the applicable multiple of invested capital metric and make-whole amount provisions contained in the Amended and Restated Limited Liability Company Agreement of Permian Holdco. See Note 12 - Partners' Capital and Mezzanine Capital to the consolidated financial statements for additional details.

Unregistered Sales of Equity Securities

In January 2022, we completed the 2022 Preferred Exchange Offer, whereby we issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units. Upon the settlement of the 2022 Preferred Exchange Offer, we eliminated $92.6 million of the Series A Preferred Unit liquidation preference amount, inclusive of accrued distributions due as of the settlement date. We did not receive any cash proceeds from the 2022 Preferred Exchange Offer.

The Partnership relied on Section 3(a)(9) of the Securities Act to exempt the 2022 Preferred Exchange Offer from the registration requirements of the Securities Act. Section 3(a)(9) offers exemptions from the registration requirements of the Securities Act for exchange offers in which (i) the issuer of the securities offered is the same as the issuer of the securities being surrendered, (ii) the holders are not being asked to surrender anything of value other than the outstanding securities, (iii) the exchange offer is made exclusively to existing holders of the issuer’s outstanding securities, and (iv) the issuer does not pay any commission or remuneration for solicitation of the exchange. Because the Partnership offered only its own common units exclusively to the holders of and in exchange for its outstanding Series A Preferred Units, and because it neither paid nor received anything of value other than the subject securities, the Partnership was able to rely on the exemption afforded by Section 3(a)(9) of the Securities Act.

Issuer Purchases of Equity Securities

We made no repurchases of our common units during the quarter or year ended December 31, 2023.

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Item 7. 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 the Partnership and its subsidiaries. As a result, the following discussion for the year ended December 31, 2023 should be read in conjunction with the consolidated financial statements and notes thereto included in this Annual Report. Among other things, the consolidated 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 Forward-Looking Statements. Actual results may differ materially from those contained in any forward-looking statements.

Overview

We are a value-driven limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States.

Our financial results are driven primarily by volume throughput across our gathering systems and by expense management. We generate the majority of our revenues from the gathering, compression, treating and processing services that we provide to our customers. A majority of the volumes that we gather, compress, treat and/or process have a fixed-fee rate structure which enhances the stability of our cash flows by providing a revenue stream that is not subject to direct commodity price risk. Currently, we also earn a portion of our revenues from the following activities that directly expose us to fluctuations in commodity prices: (i) the sale of physical natural gas and/or NGLs purchased under percentage-of-proceeds or other processing arrangements with certain of our customers in the Rockies and Piceance segments, (ii) the sale of natural gas we retain from certain Barnett segment customers, (iii) the sale of condensate we retain from our gathering services in the Piceance segment and (iv) additional gathering fees that are tied to the performance of certain commodity price indexes which are then added to the fixed gathering rates. During the year ended December 31, 2023, these additional activities accounted for approximately 39% of our total revenues.

We also have indirect exposure to changes in commodity prices in that persistently low commodity prices may cause our customers to delay and/or cancel drilling and/or completion activities or temporarily shut-in production, which would reduce the volumes of natural gas and crude oil (and associated volumes of produced water) that we gather. If certain of our customers cancel or delay drilling and/or completion activities or temporarily shut-in production, the associated MVCs, if any, ensure that we will earn a minimum amount of revenue.

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The following table presents certain consolidated and reportable segment financial data. For additional information on our reportable segments, see the “Segment Overview for the Years Ended December 31, 2023 and 2022” section herein.

	Year ended December 31,
	2023		2022
	(In thousands)
Net loss	$	(38,947)	$	(123,461)
Reportable segment adjusted EBITDA
Northeast	$	94,249	$	77,046
Rockies	87,390		57,810
Permian	24,207		18,051
Piceance	59,749		60,055
Barnett	26,171		31,624
Net cash provided by operating activities	$	126,906	$	98,744
Capital expenditures(1)	68,905		30,472
Cash consideration paid for the acquisition of Outrigger DJ, net of cash acquired	—		(166,631)
Cash consideration paid for the acquisition of Sterling DJ, net of cash acquired	—		(139,896)
Proceeds from the disposition of the Lane G&P System, net of cash sold in the transaction	—		75,020
Proceeds from the disposition of Bison Midstream, net of cash sold in the transaction	—		38,920
Investment in Double E equity method investee	3,500		8,444
Net cash provided by (used in) financing activities
Borrowings on 2026 Unsecured Notes	29,480		—
Repurchase of 2025 Senior Notes	(29,650)		—
Borrowings on ABL Facility	70,000		293,000
Repayments on ABL Facility	(87,000)		(230,000)
Repayments on Permian Transmission Term Loan	(10,507)		(4,647)
Borrowings on 2026 Secured Notes	—		84,371

_________________________________

(1)See "Liquidity and Capital Resources" herein and Note 17 - Segment Information to the consolidated financial statements for additional information on capital expenditures.

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Key Matters for the Year ended December 31, 2023. The following items are reflected in our financial results for the fiscal year ended December 31, 2023:

•Strategic review. As we previously announced in October 2023, based on our recent and expected financial performance, as well as interest recently received from third parties for potential transactions, ranging from the sale of specific assets to consideration for the whole Partnership, our Board of Directors has engaged external advisors to evaluate strategic alternatives for us with the goal of maximizing value for our unitholders. These alternatives may include, but are not limited to, continued execution of our business plan, sale of assets, refinancing parts or the entirety of our capital structure, sale of the Partnership by merger or cash, or any combination of these and other alternatives.

If our Board of Directors decides to proceed with a strategic transaction, it may not be at a price that our investors view as attractive relative to the value of our standalone business. Additionally, the closing of any such transaction would be dependent upon a number of factors that may be beyond our control, including, among other factors, market conditions, regulatory factors, industry trends, the interest of third parties in our business and the availability of financing to potential buyers on reasonable terms. If our Board of Directors decides not to proceed with a strategic transaction, this could have a negative effect on the market price and volatility of our common units.

•Refinancing of 2025 Senior Notes. In November 2023, we entered into a private agreement to issue a total of $209.5 million aggregate principal amount of unsecured notes (the “2026 Unsecured Notes”) in exchange for $180.0 million aggregate principal amount of our existing 2025 Senior Notes and $29.5 million in cash (the “2023 Exchange”). The exchanged 2025 Senior Notes were cancelled. The cash raised was used to repurchase $29.7 million aggregate principal amount of existing 2025 Senior Notes (together with the 2023 Exchange, the “2023 Exchange Transactions”) that were not exchanged. As of December 31, 2023, following the consummation of the 2023 Exchange Transactions, approximately $49.8 million of 2025 Senior Notes remained outstanding. The 2026 Unsecured Notes will bear interest at 12.00% and mature on October 15, 2026, in line with the maturity date of our 2026 Secured Notes.

•Integration of DJ Acquisitions. Our financial results for the year ended December 31, 2023 include our first full year with the assets acquired in the 2022 DJ Acquisitions. During 2023, we worked on integrating the 2022 DJ Acquisitions into our existing DJ Basin assets and began to achieve capital and operating synergies. Those integration efforts will continue into 2024.

Key Matters for the Year ended December 31, 2022. The following items are reflected in our financial results for the fiscal year ended 2022:

•Strategic DJ Acquisitions. On December 1, 2022, we completed the acquisition of 100% of the membership interests in Outrigger DJ from Outrigger Energy II LLC for cash consideration of $165 million, subject to post-closing adjustments, and 100% of the membership interests in each of Sterling Energy Investments LLC, Grasslands Energy Marketing LLC and Centennial Water Pipelines LLC from Sterling Investment Holdings LLC for cash consideration of $140 million, subject to post-closing adjustments, respectively, pursuant to definitive agreements, each dated October 14, 2022.

As a result of the 2022 DJ Acquisitions, we acquired natural gas gathering and processing systems, a crude oil gathering system, freshwater rights, and a freshwater delivery system in the DJ Basin. The acquired assets of Outrigger DJ and Sterling DJ are located in Weld, Morgan, and Logan Counties, Colorado and Cheyenne County, Nebraska.

•Financing of 2022 DJ Acquisitions. The 2022 DJ Acquisitions were financed through a combination of cash on hand, borrowings under Summit’s ABL Facility and the issuance of $85.0 million aggregate principal amount of Additional 2026 Secured Notes.

•Sale of Non-Core Assets. On September 19, 2022, we completed the sale of Bison Midstream, LLC (“Bison Midstream”) and its gas gathering system in Burke and Mountrail Counties, North Dakota to a subsidiary of Steel Reef Infrastructure Corp., an integrated owner and operator of associated gas capture, gathering and processing assets in North Dakota and Saskatchewan. Additionally, on June 30, 2022, we completed the sale of Summit Permian, which owns the Lane Gathering and Processing System (“Lane G&P System”), to Longwood Gathering and Disposal Systems, LP (“Longwood”), a wholly owned subsidiary of Matador ͏Resources Company (“Matador”).

•January 2022 Series A Preferred Unit Exchange. In January 2022, we completed the 2022 Preferred Exchange Offer, whereby we issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units. Upon the settlement of the 2022 Preferred Exchange

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Offer, we eliminated $92.6 million of the Series A Preferred Unit liquidation preference amount, inclusive of accrued distributions due as of the settlement date. See Note 12 – Partners' Capital and Mezzanine Capital for additional information.

Trends and Outlook

Our business has been, and we expect our future business to continue to be, affected by the following key trends:

•Ongoing impact of political and economic conditions and events in foreign oil and natural gas producing countries on commodity prices, including the current Russia-Ukraine conflict, the international sanctions against Russia, continued conflict in the Middle East and other sustained military campaigns;

•Natural gas, NGL and crude oil supply and demand dynamics;

•Actions of the OPEC and its allies, including the ability and willingness of the members of OPEC and other exporting nations to agree to and maintain oil price and production controls;

•Production from U.S. shale plays;

•Capital markets availability and cost of capital; and

•Inflation and shifts in operating costs.

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.

Integration of DJ Acquisitions. On December 1, 2022, we completed the 2022 DJ Acquisitions for total cash consideration of $305.0 million, subject to post-closing adjustments. As a result of the 2022 DJ Acquisitions, we acquired natural gas gathering and processing systems, a crude oil gathering system, freshwater rights, and a freshwater delivery system in the DJ Basin. The acquired assets of Outrigger DJ and Sterling DJ are located in Weld, Morgan, and Logan Counties, Colorado and Cheyenne County, Nebraska. During 2023, we continued to integrate the 2022 DJ Acquisitions into our existing DJ Basin assets and began to achieve capital and operating synergies. Those integration efforts will continue into 2024.

Capital structure optimization and portfolio management. The Partnership intends to improve its capital structure in the future by reducing its indebtedness with free cash flow, and when appropriate, it may pursue opportunistic transactions with the objective of increasing long term unitholder value. This may include opportunistic acquisitions (such as the 2022 DJ Acquisitions), divestitures (such as the dispositions of the Lane G&P System and Bison Midstream in 2022), re-allocation of capital to new or existing areas, and development of joint ventures involving our existing midstream assets or new investment opportunities. We believe that our internally generated cash flow, our ABL Facility, the Permian Term Loan Facility, and access to debt or equity will be adequate to finance our strategic initiatives. To attain our overall corporate strategic objectives, we may conduct an asset divestiture, or divestitures, at a transaction valuation that is less than the net book value of the divested asset.

Ongoing impact of the current Russia-Ukraine conflict, the international sanctions against Russia on commodity prices and conflict in the Middle East. Although the Partnership does not operate in Ukraine, Russia or the Middle East, there are certain impacts arising from Russia’s invasion of Ukraine and conflict in the Middle East that could have a potential effect on the Partnership, including, but not limited to, volatility in currencies and commodity prices, higher inflation, cost and supply chain pressures and availability and disruptions in banking systems and capital markets. As of the date of filing, there have been no material impacts on the Partnership.

Natural gas, NGL and crude oil supply and demand dynamics. Natural gas continues to be a critical component of energy supply and demand in the United States. The average spot price of natural gas decreased by approximately 61% from 2022 to 2023, primarily due to natural gas supply exceeding demand. The average daily Henry Hub Natural Gas Spot Price was $2.53 per MMBtu during 2023, compared with $6.45 per MMBtu during 2022. As of January 31, 2024, Henry Hub 12-month strip pricing closed at $2.10 per MMBtu. In response to the decreasing natural gas prices, the number of active natural gas drilling rigs in the continental United States decreased from 156 in December 2022 to 120 in December 2023, according to Baker Hughes. Over the long term, we believe that the prospects for continued natural gas demand are favorable and will be driven primarily by global population and economic growth, as well as the continued displacement of coal-fired electricity generation by natural gas-fired electricity generation and increase in U.S. LNG exports. Over the next several years, we expect natural gas prices will support continued upstream industry activity by producers focused on natural gas production.    

In addition, certain of our gathering systems are directly affected by crude oil supply and demand dynamics. Crude oil prices decreased in 2023, with the average daily Cushing, Oklahoma West Texas Intermediate crude oil spot price average of $94.90 per barrel during 2022 decreasing to an average of $77.58 per barrel during 2023, representing an 18% decrease. As of January

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31, 2024, West Texas Intermediate 12-month strip pricing closed at $75.85 per barrel. In response to the increasing crude oil prices, the number of active crude oil drilling rigs in the continental United States decreased from 621 in December 2022 to 500 in December 2023, according to Baker Hughes. Over the next several years, we expect that crude oil prices will support continued drilling activity and increasing production in the Williston Basin, Permian Basin and, given the current regulatory environment in Colorado, in rural parts of the DJ Basin.

Despite improving fundamentals that should support additional development activities, we note that over the last several years there has been an increasing societal opposition to the production of hydrocarbons generally, which may be reflected in legislation, executive orders or regulations that may significantly restrict the domestic production of fossil fuels, including natural gas.

Growth in production from U.S. shale plays. Over the past several years, natural gas production from unconventional shale resources has increased due to advances in technology that allow producers to extract significant volumes of natural gas from unconventional shale plays on favorable economic terms relative to most conventional plays. In recent years, a number of producers and their joint venture partners, including large international operators, industrial manufacturers and private equity sponsors, have committed significant capital to the development of these unconventional resources, including the Piceance, Barnett, Bakken, Marcellus, Utica and Permian Basin shale plays in which we operate. We believe that these long-term capital investments should support drilling activity in unconventional shale plays over the long term.

Rate of growth in production from U.S. shale plays. Some of our producer customers have adjusted their drilling and completion activities and schedules to manage drilling and completion costs at levels that are achievable using internally generated cash flow from their underlying operations. Historically, as part of a strategy to accelerate production growth, these producers would raise external capital to fund drilling and completion costs in excess of the cash flows generated from their underlying assets. Producers are experiencing increasing pressure from their investors to focus on returning capital and maximizing free cash flow versus re-investing that cash flow into development. In general, we expect our producer customers to maintain moderate completion and production activities across many of our systems relative to our previous expectations as a result of the commodity price environment and a continuation of the general trend of producers constraining drilling and completion activity to levels that can be satisfied with internally generated cash flow.

Capital markets availability and cost of capital. Capital markets conditions, including but not limited to availability and higher borrowing costs, could affect our ability to access the debt and equity capital markets to the extent necessary, to fund our future growth. Furthermore, market demand for equity issued by master limited partnerships has been significantly lower in recent years than it has been historically, which may make it more challenging for us to finance our capital expenditures with the issuance of additional equity. We announced the elimination of our common unit distribution in May 2020 beginning with the distribution paid in respect of the first quarter of 2020, and this action may further reduce demand for our common units. In addition, interest rates on future credit facilities and debt offerings could be higher than current levels, causing our financing costs to increase accordingly.

The borrowings under our ABL Facility, which have a variable interest rate, expose us to the risk of increasing interest rates. We do not anticipate making offers to purchase in the designated amount for the fiscal year ended 2023, and, as a result, the interest rate on the 2026 Secured Notes will increase an incremental 50 basis points to 9.50% effective April 1, 2024, resulting in an incremental increase in annual interest expense of approximately $3.9 million.

Inflation and operating costs. The annual rate of inflation in the United States hit 6.5% in December 2022, one of the highest increases in more than three decades, as measured by the Consumer Price Index. While inflation has declined since the second half of 2022, declining to 3.4% as of December 31, 2023, further increases in inflation in 2024 could increase our operating costs and the overall cost of capital projects we undertake. While some of our fee arrangements escalate based on changes in price indexes, these fee escalations may not be sufficient to offset an increase in our expenditures. Furthermore, inflation may impact producers’ economic decision making, which in turn could impact their willingness to develop acreage in areas that are more susceptible to inflationary pressures and labor force shortages.

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How We Evaluate Our Operations

We conduct and report our operations in the midstream energy industry through five reportable segments: Northeast, Rockies, Permian, Piceance and Barnett. Each of our reportable segments provides midstream services in a specific geographic area and our reportable segments reflect the way in which we internally report the financial information used to make decisions and allocate resources in connection with our operations (see Note 17 - Segment Information to the consolidated financial statements). Our management uses a variety of financial and operational metrics to analyze our consolidated and segment performance and we view these metrics as important factors in evaluating our profitability. These metrics include (i) throughput volume, (ii) revenues, (iii) operation and maintenance expenses, (iv) capital expenditures and (v) segment adjusted EBITDA.

Throughput Volume

The volume of (i) natural gas that we gather, compress, treat and/or process and (ii) crude oil and produced water that we gather depends on the level of production from natural gas or crude oil wells connected to our gathering systems. Aggregate production volumes are impacted by the overall amount of drilling and completion activity. Furthermore, because the production rate of natural gas and crude oil wells decline over time, production can only be maintained or increased by new drilling or other activity.

As a result, we must continually obtain new supplies of production 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 throughput is impacted by:

•successful drilling activity within our AMIs;

•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 AMIs awaiting connections;

•our ability to compete for volumes from successful new wells in the areas in which we operate outside of our existing AMIs; and

•our ability to gather, treat and/or process production that has been released from commitments with our competitors.

We report volumes gathered for natural gas in cubic feet per day. We aggregate crude oil and produced water gathering and report volumes gathered in barrels per day.

Revenues

Our revenues are primarily attributable to the volumes that we gather, compress, treat and/or process and the rates we charge for those services. A majority of our gathering and processing agreements are fee-based, which limits our direct exposure to fluctuations in commodity prices; however, certain of our contracts have rates that are directly impacted by commodity prices. We also have percent-of-proceeds arrangements with certain customers under which the gathering and processing revenues that we earn correlate directly with the fluctuating price of natural gas, condensate and NGLs.

Certain of our gathering and processing agreements contain MVCs pursuant to which our customers agree to ship or process a minimum volume of production on our gathering systems, or, in some cases, to pay a minimum monetary amount, over certain periods during the term of the MVC. These MVCs help us generate stable revenues and serve to mitigate the financial impact associated with declining volumes.

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 our assets. Direct labor costs, compression costs, ad valorem 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 largely independent of volumes delivered through our gathering systems but may fluctuate depending on the activities performed during a specific period.

Our operations and maintenance expenses also include costs that are reimbursed by our customers, which are included in Other revenues.

Segment Adjusted EBITDA

Segment adjusted EBITDA is a supplemental financial measure used by management and by external users of our financial statements such as investors, commercial banks, research analysts and others.

Segment adjusted EBITDA is used to assess:

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•the ability of our assets to generate cash sufficient to make cash distributions and support our indebtedness;

•the financial performance of our assets without regard to financing methods, capital structure or historical cost basis;

•our operating performance and return on capital as compared to other companies in the midstream energy sector, without regard to financing or capital structure;

•the attractiveness of capital projects and acquisitions and the overall rates of return on alternative investment opportunities; and

•the financial performance of our assets without regard to (i) income or loss from equity method investees, (ii) the impact of the timing of MVC shortfall payments under our gathering agreements or (iii) the timing of impairments or other noncash income or expense items.

Additional Information. For additional information, see the “Results of Operations” section herein and the notes to the consolidated financial statements contained in Item 8. Financial Statements and Supplementary Data.

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Results of Operations

Consolidated Overview for the Years Ended December 31, 2023 and 2022

The following table presents certain consolidated data and volume throughput for the years ended December 31, 2023 and 2022.

	Year ended December 31,
	2023		2022		Percentage change
	(In thousands)
Revenues:
Gathering services and related fees	$	248,223	$	248,358	—%
Natural gas, NGLs and condensate sales	179,254		86,225		108%
Other revenues	31,426		35,011		(10%)
Total revenues	458,903		369,594		24%
Costs and expenses:
Cost of natural gas and NGLs	112,462		76,826		46%
Operation and maintenance	100,741		84,152		20%
General and administrative	42,135		44,943		(6%)
Depreciation and amortization	122,764		119,055		3%
Acquisition integration costs	2,654		—		*
Transaction costs	1,251		6,968		(82%)
Gain on asset sales, net	(260)		(507)		(49%)
Long-lived asset impairment	540		91,644		(99%)
Total costs and expenses	382,287		423,081		(10%)
Other income (expense), net	865		(4)		*
Gain on interest rate swaps	1,830		16,414		(89%)
Loss on sale of business	(47)		(1,741)		(97%)
Interest expense	(140,784)		(102,459)		37%
Loss on early extinguishment of debt	(10,934)		—		*
Loss before income taxes and equity method investment income	(72,454)		(141,277)		(49%)
Income tax expense	(322)		(325)		(1%)
Income from equity method investees	33,829		18,141		86%
Net loss	$	(38,947)	$	(123,461)	(68%)
Volume throughput (1):
Aggregate average daily throughput - natural gas (MMcf/d)	1,292		1,208		7%
Aggregate average daily throughput - liquids (Mbbl/d)	78		62		26%

_________________________________________________

*Not considered meaningful

(1)Excludes volume throughput for Ohio Gathering and Double E. For additional information, see the Northeast and Permian sections herein under the caption “Segment Overview for the Years Ended December 31, 2023 and 2022”.

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Volumes – Gas. Natural gas throughput volumes increased 84 MMcf/d for the year ended December 31, 2023 compared to the year ended December 31, 2022, primarily reflecting:

•a volume throughput increase of 40 MMcf/d for the Northeast segment.

•a volume throughput decrease of 2 MMcf/d for the Piceance segment.

•a volume throughput decrease of 14 MMcf/d for the Permian segment.

•a volume throughput decrease of 20 MMcf/d for the Barnett segment.

•a volume throughput increase of 80 MMcf/d for the Rockies segment.

Volumes – Liquids. Crude oil and produced water volume throughput for the Rockies segment increased 16 Mbbl/d for the year ended December 31, 2023 compared to the year ended December 31, 2022, primarily as a result of 65 new well connections that came online during 2023, offset by natural production declines and weather related downtime.

For additional information on volumes, see the “Segment Overview for the Years Ended December 31, 2023 and 2022” section herein.

Revenues. Total revenues increased $89.3 million during the year ended December 31, 2023 compared to the year ended December 31, 2022 comprised of a $93.0 million increase in natural gas, NGLs and condensate sales, offset by a $3.6 million decrease in Other revenues, and a $0.1 million decrease in gathering services and related fees.

Gathering services and related fees. Gathering services and related fees decreased $0.1 million compared to the year ended December 31, 2022, primarily reflecting:

•a $4.3 million decrease in the Barnett, primarily due to production curtailments associated with a significant reduction in commodity pricing;

•a $3.7 million decrease in the Permian, primarily due to the disposition of the Lane G&P System in June 2022;

•a $2.0 million decrease in the Rockies, primarily due to decreased volume throughput and the expiration of a customer’s minimum volume commitment contract in the DJ Basin; partially offset by

•a $9.4 million increase in the Northeast, primarily due to increased volume throughput,

Natural Gas, NGLs and Condensate Sales. Natural gas, NGLs and condensate sales revenue increased $93.0 million compared to the year ended December 31, 2022, primarily reflecting:

•a $114.5 million increase in the Rockies reportable segment, primarily due to the 2022 DJ Acquisitions, partially offset by the disposition of Bison Midstream in September 2022; offset by

•a $17.4 million decrease in the Permian reportable segment, primarily due to the disposition of the Lane G&P System in June 2022;

•a $2.3 million decrease in the Piceance reportable segment;

•a $1.7 million decrease in the Barnett reportable segment.

Costs and expenses. Total costs and expenses decreased $40.8 million during the year ended December 31, 2023 compared to the year ended December 31, 2022, primarily reflecting:

Cost of natural gas and NGLs. Cost of natural gas and NGLs increased $35.6 million during the year ended December 31, 2023 compared to the year ended December 31, 2022, primarily driven by the 2022 DJ Acquisitions in December 2022, partially offset by the disposition of the Lane G&P System in June 2022 and the disposition of Bison Midstream in September 2022.

Operation and maintenance. Operation and maintenance expense increased $16.6 million for the year ended December 31, 2023 compared to the year ended December 31, 2022; primarily as a result of the acquisitions of Sterling DJ and Outrigger DJ in December 2022, partially offset by the disposition of the Lane G&P System in June 2022 and the disposition of Bison Midstream in September 2022.

Asset Impairments. In 2022, we recognized impairments of $84.5 million related to the disposition of the Lane G&P System and $6.9 million in connection with disposition of Bison Midstream. In 2023, we recognized impairments of $0.5 million.

Interest Expense. Interest expense increased $38.3 million during the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily due to $18.0 million of increased borrowing costs on the ABL Facility resulting from higher interest rates and borrowings throughout 2023 compared to 2022, $7.0 million of increased borrowing costs resulting from the issuance of $85.0 million of 2026 Secured Notes to fund the 2022 DJ Acquisitions, $4.9 million of higher borrowing

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costs on the Permian Transmission Term Loan, $4.5 million of increased borrowing costs on the 2026 Secured Notes, $3.4 million of increased amortization of debt issuance costs and $3.1 million of borrowing costs on the newly issued 2026 Unsecured Notes.

See Note 9 – Debt to the consolidated financial statements for additional details. Interest expense does not include the impact of gains or losses from our interest rate swaps entered into for the Permian Transmission Credit Facilities.

Segment Overview for the Years Ended December 31, 2023 and 2022

Northeast.

Volume throughput for the Northeast reportable segment follows.

	Northeast
	Year ended December 31,
	2023	2022	Percentage Change
Average daily throughput (MMcf/d)	692	652	6%
Average daily throughput (MMcf/d) (Ohio Gathering)	779	674	16%

Volume throughput for the Northeast, excluding Ohio Gathering, increased 6% compared to the year ended December 31, 2022 primarily due 31 well connections that came online during the year ended December 31, 2023 partially offset by natural production declines as well as frac-protect activities which occurred primarily during the first half of 2023.

Volume throughput for the Ohio Gathering system increased 16% compared to the year ended December 31, 2022, primarily as a result of 48 new well connections that came online during the year ended December 31, 2023, partially offset by natural production declines and volume shut-in for frac-protect activities that occurred primarily during the first half of 2023.

Financial data for our Northeast reportable segment follows.

	Northeast
	Year ended December 31,
	2023		2022		Percentage Change
Revenues:	(Dollars in thousands)
Gathering services and related fees	$	63,805	$	54,392	17%
Total revenues	63,805		54,392		17%
Costs and expenses:
Operation and maintenance	8,862		7,097		25%
General and administrative	867		831		4%
Depreciation and amortization	17,856		17,501		2%
Gain on asset sales, net	(7)		(10)		(30)%
Total costs and expenses	27,578		25,419		8%
Add:
Depreciation and amortization	17,856		17,501
Adjustments related to capital reimbursement activity	(81)		(81)
Gain on asset sales, net	(7)		(10)
Proportional adjusted EBITDA for Ohio Gathering	40,125		30,656
Other	129		7
Segment adjusted EBITDA	$	94,249	$	77,046	22%

_________________

*Not considered meaningful

Year ended December 31, 2023. Segment adjusted EBITDA increased $17.2 million compared to the year ended December 31, 2022, primarily as a result of revenue increases of $9.4 million from gathering services and related fees as well as a $9.5 million increase in proportional adjusted EBITDA for Ohio Gathering.

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Rockies.

Volume throughput for our Rockies reportable segment follows.

	Rockies
	Year ended December 31,
	2023	2022	Percentage Change
Aggregate average daily throughput - natural gas (MMcf/d)	113	33	242%
Aggregate average daily throughput - liquids (Mbbl/d)	78	62	26%

Natural gas. Natural gas volume throughput in 2023 increased 242% compared to the year ended December 31, 2022, primarily reflecting the 2022 DJ Acquisitions and 94 new well connections that came online during 2023, partially offset by the sale of Bison Midstream in September 2022. Aggregate volume throughput for 2022 includes 9 MMcf/d of average daily throughput related to the Bison Midstream assets.

For the years ended December 31, 2023 and 2022, costs of natural gas and NGLs includes $39.6 million and $12.2 million, respectively, of gathering fees collected under percentage of proceeds arrangements.

Liquids. Liquids volume throughput in 2023 increased 26% compared to the year ended December 31, 2022, primarily associated with 65 new well connections that came online during 2023.

Financial data for our Rockies reportable segment follows.

	Rockies
	Year ended December 31,
	2023		2022		Percentage Change
	(Dollars in thousands)
Revenues:
Gathering services and related fees	$	65,869	$	67,838	(3%)
Natural gas, NGLs and condensate sales	173,688		59,208		193%
Other revenues	15,474		16,557		(7%)
Total revenues	255,031		143,603		78%
Costs and expenses:
Cost of natural gas and NGLs	110,105		52,749		109%
Operation and maintenance	50,246		30,260		66%
General and administrative	4,185		2,541		65%
Depreciation and amortization	36,148		30,532		18%
Integration costs	553		—		*
Gain on asset sales, net	(127)		(63)		102%
Long-lived asset impairment	540		7,068		(92%)
Total costs and expenses	201,650		123,087		64%
Add:
Depreciation and amortization	36,148		30,532
Integration costs	553		—
Adjustments related to capital reimbursement activity	(3,378)		(431)
Gain on asset sales, net	(127)		(63)
Long-lived asset impairment	540		7,068
Other	273		188
Segment adjusted EBITDA	$	87,390	$	57,810	51%

_________________

* Not considered meaningful

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Year ended December 31, 2023. Segment adjusted EBITDA increased $29.6 million compared to the year ended December 31, 2022 primarily due to the 2022 DJ Acquisitions, partially offset by the sale of Bison Midstream in September 2022.

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Permian.

Volume throughput for our Permian reportable segment follows.

	Permian
	Year ended December 31,
	2023	2022	Percentage Change
Average daily throughput (MMcf/d)	—	14	(100%)
Average daily throughput (MMcf/d) (Double E)	305	277	10%

On June 30, 2022, we completed the sale of our Lane G&P System.

Volume throughput for Double E increased 10% compared to the year ended December 31, 2022.

The following table presents the MVC quantities that Double E’s shippers have contracted to with firm transportation service agreements and related negotiated rate agreements, excluding a new firm transportation agreement executed with a large independent oil and gas exploration and production company that includes a 10 year contract term with an expected in-service upon completion of the associated project:

Weighted average MVC quantities for the year ended December 31,	(MMBTU/day)
2024	986,803
2025	1,000,000
2026	1,000,000
2027	1,000,000
2028	1,000,000
2029	1,000,000
2030	1,000,000
2031	879,452

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Financial data for our Permian reportable segment follows.

	Permian
	Year ended December 31,
	2023		2022		Percentage Change
	(Dollars in thousands)
Revenues:
Gathering services and related fees	$	—	$	3,668	(100%)
Natural gas, NGLs and condensate sales	—		17,382		(100%)
Other revenues	3,570		4,101		(13%)
Total revenues	3,570		25,151		(86%)
Costs and expenses:
Cost of natural gas and NGLs	—		18,007		(100%)
Operation and maintenance	—		3,082		(100%)
General and administrative	308		708		(56%)
Depreciation and amortization	—		2,736		(100%)
Transaction costs	75		—		*
Gain on asset sales, net	—		(13)		*
Long-lived asset impairment	—		84,516		(100%)
Total costs and expenses	383		109,036		(100%)
Add:
Depreciation and amortization	—		2,736
Transaction costs	75		—
Adjustments related to capital reimbursement activity	—		(63)
Gain on asset sales, net	—		(13)
Long-lived asset impairment	—		84,516
Proportional adjusted EBITDA for Double E	20,945		14,762
Other	—		(2)
Segment adjusted EBITDA	$	24,207	$	18,051	34%

_________________

* Not considered meaningful

Year ended December 31, 2023. Segment adjusted EBITDA increased $6.2 million compared to the year ended December 31, 2022 primarily as a result of an increase in proportional adjusted EBITDA from our equity method investment in Double E, partially offset by the disposition of the Lane G&P System in 2022.

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Piceance.

Volume throughput for our Piceance reportable segment follows.

	Piceance
	Year ended December 31,
	2023	2022	Percentage Change
Aggregate average daily throughput (MMcf/d)	304	306	(1%)

Volume throughput decreased 1% in 2023 compared to the year ended December 31, 2022, primarily as a result of natural production declines, partially offset by 56 new well connections that came online during 2023.

Financial data for our Piceance reportable segment follows.

	Piceance
	Year ended December 31,
	2023		2022		Percentage Change
	(Dollars in thousands)
Revenues:
Gathering services and related fees	$	81,041	$	80,630	1%
Natural gas, NGLs and condensate sales	4,788		7,111		(33%)
Other revenues	5,588		5,608		*
Total revenues	91,417		93,349		(2%)
Costs and expenses:
Cost of natural gas and NGLs	2,357		4,805		(51%)
Operation and maintenance	23,441		23,523		*
General and administrative	1,189		1,280		(7%)
Depreciation and amortization	52,014		51,352		1%
Gain on asset sales, net	(45)		(311)		(86%)
Total costs and expenses	78,956		80,649		(2%)
Add:
Depreciation and amortization	52,014		51,352
Adjustments related to capital reimbursement activity	(5,099)		(4,141)
Gain on asset sales, net	(45)		(311)
Other	418		455
Segment adjusted EBITDA	$	59,749	$	60,055	*

_________________

* Not considered meaningful

Year ended December 31, 2023. Segment adjusted EBITDA decreased $0.3 million compared to the year ended December 31, 2022.

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Barnett.

Volume throughput for our Barnett reportable segment follows.

	Barnett
	Year ended December 31,
	2023	2022	Percentage Change
Average daily throughput (MMcf/d)	183	203	(10%)

Volume throughput decreased 10% compared to the year ended December 31, 2022, primarily as a result of temporary production curtailments associated with reductions in commodity pricing, partially offset by 10 wells that came online during 2023.

Financial data for our Barnett reportable segment follows.

	Barnett
	Year ended December 31,
	2023		2022		Percentage Change
	(Dollars in thousands)
Revenues:
Gathering services and related fees	$	37,508	$	41,830	(10%)
Natural gas, NGLs and condensate sales	778		2,503		(69%)
Other revenues (1)	6,831		7,763		(12%)
Total revenues	45,117		52,096		(13%)
Costs and expenses:
Operation and maintenance	18,255		18,792		(3%)
General and administrative	1,299		1,301		*
Depreciation and amortization	15,233		15,178		*
Gain on asset sales, net	(73)		(85)		(14%)
Long-lived asset impairment	—		60		(100%)
Total costs and expenses	34,714		35,246		(2%)
Add:
Depreciation and amortization (1)	16,171		16,116
Adjustments related to capital reimbursement activity	(1,316)		(1,322)
Gain on asset sales, net	(73)		(85)
Long-lived asset impairment	—		60
Other	986		5
Segment adjusted EBITDA	$	26,171	$	31,624	(17%)

_________________

*Not considered meaningful

(1)Includes the amortization expense associated with our favorable and unfavorable gas gathering contracts as reported in other revenues.

Year ended December 31, 2023. Segment adjusted EBITDA decreased $5.5 million compared to the year ended December 31, 2022 primarily as a result of $1.7 million of commercial settlements that benefited the segment’s financial results in the first quarter of 2022 and the volume throughput decreases discussed above.

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Corporate and Other Overview for the Years Ended December 31, 2023 and 2022

Corporate and Other represents those results that are not specifically attributable to a reportable segment or that have not been allocated to our reportable segments, including certain general and administrative expense items, transaction costs, acquisition integration costs, interest expense and losses on early extinguishment of debt. Corporate and Other includes intercompany eliminations.

	Corporate and Other
	Year ended December 31,
	2023	2022	Percentage Change
	(Dollars in thousands)
Costs and expenses:
General and administrative	34,287	38,282	(10%)
Transaction costs	1,176	6,968	(83%)
Interest expense	140,784	102,459	37%

_________________

* Not considered meaningful

Transaction costs. Transaction costs during 2022 were primarily related to costs incurred in connection with the 2022 DJ Acquisitions.

General and administrative. General and administrative expense attributable to Corporate and Other decreased by $4.0 million compared to the year ended December 31, 2022, primarily as a result of lower employee incentive compensation costs.

Interest Expense. Interest expense increased $38.3 million during the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily due to $18.0 million of increased borrowing costs on the ABL Facility resulting from higher interest rates and borrowings throughout 2023 compared to 2022, $7.0 million of increased borrowing costs resulting from the issuance of $85.0 million of 2026 Secured Notes to fund the 2022 DJ Acquisitions, $4.9 million of higher borrowing costs on the Permian Transmission Term Loan, $4.5 million of increased borrowing costs on the 2026 Secured Notes, $3.4 million of increased amortization of debt issuance costs and $3.1 million of borrowing costs on the newly issued 2026 Unsecured Notes.

See Note 9 – Debt to the consolidated financial statements for additional details. Interest expense does not include the impact of gains or losses from our interest rate swaps entered into for the Permian Transmission Credit Facilities.

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Liquidity and Capital Resources

We rely primarily on internally generated cash flow as well as external financing sources, including our ABL Facility and the issuance of debt, equity and preferred equity securities, and proceeds from potential asset divestitures to fund our investments. We believe that our ABL Facility and Permian Transmission Credit Facilities, together with internally generated cash flow and access to debt or equity capital markets, will be adequate to finance our operations for the next twelve months without adversely impacting our liquidity.

Off-Balance Sheet Arrangements. We may enter into off-balance sheet arrangements and transactions that can give rise to material off-balance sheet obligations. As of December 31, 2023, our material off-balance sheet arrangements and transactions include (i) letters of credit outstanding against our ABL Facility aggregating to $4.3 million and (ii) letters of credit outstanding against our Permian Transmission Credit Facilities aggregating to $10.5 million. There are no other transactions, arrangements or other relationships with unconsolidated entities or other persons that are reasonably likely to materially affect our liquidity or availability of our capital resources.

ABL Facility. Summit Holdings has a $400.0 million revolving ABL Facility pursuant to that certain Loan and Security Agreement, dated as of November 2, 2021 (the “ABL Agreement”), with a maturity date of May 1, 2026. The ABL Facility will mature on May 1, 2026; provided that if the outstanding amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date (as defined in the ABL Agreement)) on such date equals or exceeds $50.0 million, then the ABL Facility will mature on December 13, 2024. As of December 31, 2023, the outstanding balance of the ABL Facility was $313.0 million and the unused commitments were $82.7 million, after giving effect to the issuance thereunder of $4.3 million of outstanding but undrawn irrevocable standby letters of credit. The ABL Facility is secured by a first lien on all of our assets and borrowings are subject to a borrowing base comprised of a percentage of eligible accounts receivable of Summit Holdings and its subsidiaries that guarantee the ABL Facility (collectively, the “ABL Facility Guarantors”) and a percentage of eligible above-ground fixed assets including eligible compression units, processing plants, compression stations and related equipment of Summit Holdings and the ABL Facility Guarantors. As of the date of the most recent borrowing base determination, eligible assets totaled $723.2 million, an amount greater than the $400.0 million of aggregate lending commitments.

On November 16, 2023, we amended the ABL Facility to, among other things, permit the 2023 Exchange Transactions, address springing borrowing base reserves in relation to the outstanding principal amount of the 2025 Senior Notes and amend the Interest Coverage Ratio (as defined in the ABL Agreement) covenant to 1.75x through the end of 2024 and 1.90x thereafter.

There were no defaults or events of default under the ABL Facility during 2023, and as of December 31, 2023, we were in compliance with the financial covenants in the ABL Facility. The ABL Facility requires that Summit Holdings not permit (i) the First Lien Net Leverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be greater than 2.50:1.00, or (ii) the Interest Coverage Ratio as of the last day of any fiscal quarter to be less than 1.75:1.00 through the end of 2024 or less than 1.90:1.00 thereafter.

The ABL Facility restricts, among other things, Summit Holdings’ and its Restricted Subsidiaries’ (as defined in the ABL Agreement) ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions or repurchase equity; (iii) make payments on or redeem junior lien, unsecured or subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications.

As of December 31, 2023, the applicable margin under the adjusted term SOFR borrowings was 3.25%, the interest rate was 8.71% and the unused portion of the ABL Facility totaled $82.7 million after giving effect to the issuance of $4.3 million in outstanding but undrawn irrevocable standby letters of credit.

Permian Transmission Credit Facilities. On March 8, 2021 (the “Permian Closing Date”), the Partnership’s unrestricted subsidiary, Permian Transmission, entered into a Credit Agreement which allows for $175.0 million of senior secured credit facilities, including a $160.0 million Term Loan Facility and a $15.0 million Working Capital Facility. The Permian Transmission Credit Facilities can be used to finance Permian Transmission’s capital calls associated with its investment in Double E, debt service and other general corporate purposes.

As of December 31, 2023, the applicable margin under adjusted SOFR borrowings was 2.475%, the interest rate was 7.79% and the unused portion of the Permian Transmission Credit Facilities totaled $4.5 million, subject to a commitment fee of 0.7% after giving effect to the issuance of $10.5 million in outstanding but undrawn irrevocable standby letters of credit. As of December 31, 2023, the Partnership was in compliance with the financial covenants of the Permian Transmission Credit Facilities.

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Permian Transmission Term Loan. In January 2022, the Permian Term Loan Facility was converted into the Permian Term Loan Facility. The Permian Transmission Term Loan is due January 2028, as of December 31, 2023, the applicable margin under adjusted SOFR borrowings was 2.475%, the interest rate was 7.79%. Summit Permian Transmission, LLC entered into interest rate hedges with notional amounts representing approximately 90% of the Permian Term Loan facility at a fixed SOFR rate of 1.23%. As of ended December 31, 2023, the Partnership was in compliance with the financial covenants governing the Permian Transmission Term Loan.

As of December 31, 2023, the balance of the Permian Transmission Term Loan was $144.8 million, and we were in compliance with the financial covenants of the Permian Transmission Term Loan and Permian Transmission Credit Facilities.

2025 Senior Notes. In February 2017, the Co-Issuers co-issued $500.0 million of 5.75% senior unsecured notes maturing April 15, 2025 (the “2025 Senior Notes”). On November 16, 2023, we entered into a private purchase and exchange agreement (the “Exchange Agreement”) with certain purchasers listed therein to issue a total of $209.5 million aggregate principal amount of the 2026 Unsecured Notes in exchange for $180.0 million aggregate principal amount of the 2025 Senior Notes and $29.5 million in cash. The exchanged 2025 Senior Notes were cancelled. The cash raised was used to repurchase $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. The 2025 Senior Notes are senior, unsecured obligations and rank equally in right of payment with all of our existing and future senior obligations. The 2025 Senior Notes are effectively subordinated in right of payment to all of our secured indebtedness, to the extent of the collateral securing such indebtedness. The Co-Issuers may redeem all or part of the remaining 2025 Senior Notes at a redemption price of 100.000%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

2026 Secured Notes. In November 2021, we issued $700.0 million of the 2026 Secured Notes, at a price of 98.5% of face value. Additionally, in November 2022, in connection with the 2022 DJ Acquisitions, we issued an additional $85.0 million of 2026 Secured Notes at a price of 99.26% of their face value. The Co-Issuers pay interest on the 2026 Secured Notes semi-annually on April 15 and October 15 of each year, and the 2026 Secured Notes are jointly and severally guaranteed, on a senior second-priority secured basis (subject to permitted liens), by us and each of our restricted subsidiaries that is an obligor under the ABL Facility, or under the 2025 Senior Notes on the issue date of the 2026 Secured Notes. As of December 31, 2023, the outstanding balance of the 2026 Secured Notes was $785.0 million.

The 2026 Secured Notes will mature on October 15, 2026; provided that, if the outstanding amount of the 2025 Senior Notes (or any refinancing indebtedness in respect thereof that has a final maturity on or prior to the date that is 91 days after the Initial Maturity Date (as defined in the 2026 Secured Notes Indenture)) is greater than or equal to $50.0 million on January 14, 2025, which is 91 days prior to the scheduled maturity date of the 2025 Senior Notes, then the 2026 Secured Notes will mature on January 14, 2025.

Starting in the first quarter of 2023 with respect to the fiscal year ended 2022, and continuing annually through the fiscal year ended 2025, the Partnership is required under the terms of the 2026 Secured Notes Indenture to, if it has Excess Cash Flow (as defined in the 2026 Secured Notes Indenture), and subject to its ability to make such an offer under the ABL Facility, offer to purchase an amount of the 2026 Secured Notes, at 100% of the principal amount plus accrued and unpaid interest, equal to 100% of the Excess Cash Flow generated in the prior year. Generally, if the Partnership does not offer to purchase designated annual amounts of its 2026 Secured Notes or reduce its first lien capacity under the 2026 Secured Notes Indenture per annum from 2023 through 2025, the interest rate on the 2026 Secured Notes is subject to certain rate escalations. Because the Partnership did not offer to purchase at least $50.0 million in aggregate principal amount of 2026 Secured Notes by April 1, 2023, the interest rate on the 2026 Secured Notes automatically increased by 50 basis points per annum. If the Partnership has not offered to purchase $100.0 million in aggregate principal amount of 2026 Secured Notes by April 1, 2024, the interest rate on the 2026 Secured Notes shall automatically increase by 100 basis points per annum (minus any amount previously increased). If the Partnership has not offered to purchase at least $200.0 million in aggregate principal amount of 2026 Secured Notes by April 1, 2025, the interest rate on the 2026 Secured Notes shall automatically increase by 200 basis points per annum (minus any amount previously increased).

To the extent the Partnership makes an offer to purchase, and the offer is not fully accepted by the holders of the 2026 Secured Notes, the Partnership may use any remaining amount not accepted for any purpose not prohibited by the 2026 Secured Notes Indenture, or the ABL Facility. We do not anticipate making offers to purchase in the designated amount for the fiscal year ended 2023 and as a result, the interest rate on the 2026 Secured Notes will increase an incremental 50 basis points to 9.50% effective April 1, 2024, resulting in an incremental increase in annual interest expense of approximately $3.9 million.

2026 Unsecured Notes. In November 2023, we issued a total of $209.5 million aggregate principal amount of 2026 Unsecured Notes in exchange for $180.0 million aggregate principal amount of the 2025 Senior Notes and $29.5 million in cash. The exchanged 2025 Senior Notes were cancelled, and the cash raised was used to repurchase $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. The 2026 Unsecured Notes bear interest at 12.0% and mature on October 15, 2026, in line with the maturity date of the 2026 Secured Notes. The 2026 Unsecured Notes are senior,

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unsecured obligations and rank equally in right of payment with all of our existing and future senior obligations. The 2026 Unsecured Notes are effectively subordinated in right of payment to all of our secured indebtedness, to the extent of the collateral securing such indebtedness. The Co-Issuers may redeem all or a part of the 2026 Unsecured Notes at a redemption price of (a) on or before April 15, 2025, 101.00%, and (b) after April 15, 2025, 102.00%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As of December 31, 2023, the outstanding balance of the 2026 Unsecured Notes was $209.5 million.

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Cash Flows

	Year ended December 31,
	2023		2022
	(In thousands)
Net cash provided by operating activities	$	126,906	$	98,744
Net cash used in investing activities	(74,756)		(226,558)
Net cash provided by financing activities	(49,036)		121,773
Net change in cash, cash equivalents and restricted cash	$	3,114	$	(6,041)

The components of the net change in cash, cash equivalents and restricted cash were as follows:

Operating activities. Details of cash flows from operating activities follow.

Cash flows from operating activities for the year ended December 31, 2023, primarily reflected:

•a net loss of $38.9 million plus adjustments of $185.5 million for non-cash items; and

•a $19.7 million change in working capital accounts.

Cash flows from operating activities for the year ended December 31, 2022, primarily reflected:

•a net loss of $123.5 million plus adjustments of $235.7 million for non-cash items; and

•a $13.5 million change in working capital accounts.

Investing activities. Details of cash flows from investing activities follow.

Cash flows used in investing activities during the year ended December 31, 2023 primarily reflected:

•$68.9 million of capital expenditures primarily attributable to the ongoing development of our Rockies and Northeast segments; and

•$3.5 million of capital contributions and costs for our equity method investment in Double E.

Cash flows used in investing activities during the year ended December 31, 2022 primarily reflected:

•$166.6 million of cash consideration paid for the acquisition of Outrigger DJ, net of cash acquired in the transaction;

•$139.9 million of cash consideration paid for the acquisition of Sterling DJ, net of cash acquired in the transaction;

•$30.5 million of capital expenditures primarily attributable to the ongoing development of our Rockies and Northeast segments;

•$8.4 million of capital contributions and costs for our equity method investment in Double E; offset by

•$75.0 million of cash proceeds from the disposition of the Lane G&P System, net of cash sold in the transaction;

•    $38.9 million of cash proceeds from the disposition of Bison Midstream, net of cash sold in the transaction; and

•$4.9 million of cash proceeds from the sale of unused assets and latent inventory.

Financing activities. Details of cash flows from financing activities follow.

Cash flows used in financing activities during the year ended December 31, 2023 primarily reflected:

•$87.0 million of cash outflows for repayments on the ABL Facility;

•$29.7 million of cash outflows for the repurchase of 2025 Senior Notes;

•$10.5 million of cash outflows for repayments on the Permian Transmission Term Loan; offset by

•$29.5 million of borrowings under the 2026 Unsecured Notes; and

•$70.0 million from borrowings under the ABL Facility.

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Cash flows provided by financing activities during the year ended December 31, 2022 primarily reflected:

•$293.0 million of cash received from borrowing under the ABL Facility;

•$84.4 million from the additional issuance of the 2026 Secured Notes; offset by

•$230.0 million in repayments on the ABL Facility.

Contractual Obligations Update

The Partnership’s cash flows generated from operations are the primary source for funding various contractual obligations. The table below summarizes the Partnership’s major commitments as of December 31, 2023 through 2028 (in thousands):

	Total		2024		2025		2026		2027		2028
2025 Senior Notes, due April 2025 (2)	$	53,719	$	2,863	$	50,856	$	—	$	—	$	—
ABL Facility, due May 2026 (2)	376,611		27,262		27,262		322,087		—		—
2026 Secured Notes, due October 2026 (1)	999,403		74,575		74,575		850,253		—		—
2026 Unsecured Notes, due October 2026 (2)	281,791		25,141		25,141		231,509		—		—
Permian Transmission Term Loan, due January 2028 (3)	186,451		26,360		26,179		25,263		24,720		83,929
Global Settlement for 2015 Blacktail release, inclusive of interest (4)	21,668		6,667		6,667		6,667		1,667		—
Lease obligations	14,310		4,937		4,309		2,842		2,161		61
Total	$	1,933,953	$	167,805	$	214,989	$	1,438,621	$	28,548	$	83,990

(1)Amounts above exclude the impact of principal reductions resulting from offers to purchase the 2026 Secured Notes with excess cash flow tenders required in the 2026 Secured Notes indenture. For illustration purposes, a 9.500% interest rate on the 2026 Secured Notes was utilized for the periods 2024 through 2026. If we fail to make certain offers to purchase the 2026 Secured Notes, the interest rate on the 2026 Secured Notes will increase. See Note 9 – Debt to the consolidated financial statements and the “The interest rate on the 2026 Secured Notes will be increased if the Partnership fails to make certain offers to purchase 2026 Secured Notes” section of Item 1A. Risk Factors for additional details.

(2)Amounts include an estimate for interest cost based on either the stated interest rate for fixed rate indebtedness or the interest rate in effect as of December 31, 2023 for variable rate indebtedness.

(3)Amounts include mandatory principal repayments of $15.5 million in 2024, $16.6 million in 2025, $17.0 million in 2026 and $17.8 million in 2027.

(4)Global Settlement amounts in the table exclude interest owed on the unpaid portion. See Note 10 - Commitments and Contingencies to the consolidated financial statements for additional details.

Capital Requirements

Our 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.

For the year ended December 31, 2023, cash paid for capital expenditures totaled $68.9 million which included $12.4 million of maintenance capital expenditures. For the year ended December 31, 2023, we contributed $3.5 million to Double E.

We rely primarily on internally generated cash flow as well as external financing sources, including commercial bank borrowings and the issuance of debt, equity and preferred equity securities, and proceeds from asset divestitures to fund our capital expenditures. We believe that our internally generated cash flow and access to debt or equity capital markets, will be adequate to finance our business for the next twelve months without adversely impacting our liquidity. Depending on the needs of our business, contractual limitations and market conditions, we may from time to time seek to issue equity securities, incur additional debt, issue debt securities, or redeem, repurchase, refinance, or retire our outstanding debt through privately negotiated transactions, open market repurchases, redemptions, exchanges, tender offers or otherwise, but we are under no obligation to do so. There can be no assurance that we will seek to do any of the foregoing or that we will be able to do any of the foregoing on terms acceptable to us or at all.

We estimate that our 2024 capital program will range from $30.0 million to $40.0 million, including between $10.0 million and $15.0 million of maintenance capital expenditures. We estimate investment in Double E equity method investee of approximately $5.0 million.

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There are a number of risks and uncertainties that could cause our current expectations to change, including, but not limited to, (i) the ability to reach agreement with third parties; (ii) prevailing conditions and outlook in the natural gas, crude oil and NGL industries and markets and (iii) our ability to obtain financing from commercial banks, the capital markets, or other financing sources.

Credit and Counterparty Concentration Risks

We examine the creditworthiness of counterparties 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.

Certain of our customers may be temporarily unable to meet their current obligations. While this may cause a disruption to cash flows, we believe that we are properly positioned to deal with the potential disruption because the vast majority of our gathering assets are strategically positioned at the beginning of the midstream value chain. The majority of our infrastructure is connected directly to our customers’ wellheads and pad sites, which means our gathering systems are typically the first third-party infrastructure through which our customers’ commodities flow and, in many cases, the only way for our customers to get their production to market.

We have exposure due to nonperformance under our MVC contracts whereby a customer, who does not meet its MVCs, does not have the wherewithal to make its MVC shortfall payments when they become due. We typically receive payment for all prior-year MVC shortfall billings in the quarter immediately following billing. Therefore, our exposure to risk of nonperformance is limited to and accumulates during the current year-to-date contracted measurement period.

Summarized Financial Information

The supplemental summarized financial information below reflects SMLP’s separate accounts, the combined accounts of the Co-Issuers and the Guarantor Subsidiaries (the Co-Issuers and, together with the Guarantor Subsidiaries, the “Obligor Group”) for the dates and periods indicated. The financial information of the Obligor Group is presented on a combined basis and intercompany balances and transactions between the Co-Issuers and Guarantor Subsidiaries have been eliminated. There were no reportable transactions between the Co-Issuers and Obligor Group and the subsidiaries that were not issuers or guarantors of the Senior Notes.

Payments to holders of the Senior Notes are affected by the composition of and relationships among the Co-Issuers, the Guarantor Subsidiaries and Non-Guarantor Subsidiaries, who are unrestricted subsidiaries of SMLP and are not issuers or guarantors of the Senior Notes. The assets of our unrestricted subsidiaries are not available to satisfy the demands of the holders of the Senior Notes. In addition, our unrestricted subsidiaries are subject to certain contractual restrictions related to the payment of dividends, and other rights in favor of their non-affiliated stakeholders, that limit their ability to satisfy the demands of the holders of the Senior Notes.

On June 30, 2022, we completed the sale of all the equity interests in Summit Permian and Permian Finance to a third party. Additionally, on September 19, 2022, we completed the sale of Bison Midstream to a third party. In connection with these dispositions, the status of Bison Midstream, Summit Permian and Permian Finance as guarantor subsidiaries, was modified prior to the occurrence of each respective disposition.

On December 1, 2022, we completed the acquisition of Outrigger DJ for cash consideration of $165.0 million, subject to post-closing adjustments, and Sterling DJ for cash consideration of $140.0 million, subject to post-closing adjustments. In connection with the acquisitions, Summit DJ - O, LLC (formerly Outrigger DJ Midstream, LLC), Summit DJ - O Operating, LLC (formerly Outrigger DJ Operating, LLC), Summit DJ - S, LLC (formerly Sterling Energy Investments, LLC), Grasslands Energy Marketing, LLC and Centennial Water Pipelines, LLC became newly acquired entities. With the exception of Centennial Water Pipeline, LLC, all acquired entities guarantee our obligations under the Senior Notes.

The summarized financial information below presents the activities and balances of Bison Midstream, Summit Permian and Summit Finance as guarantor subsidiaries for all summarized income statement periods and balance sheet dates presented in which they were owned by the Partnership.

A list of each of SMLP’s subsidiaries that is a guarantor, issuer or co-issuer of our registered securities subject to the reporting requirements in Release 33-10762 is filed as Exhibit 22.1 to this Annual Report.

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Summarized Balance Sheet Information. Summarized balance sheet information as of December 31, 2023 and December 31, 2022 follow.

	December 31, 2023
	SMLP		Obligor Group
	(In thousands)
Assets
Current assets	$	2,993	$	93,035
Noncurrent assets	9,801		2,069,149
Liabilities
Current liabilities	$	10,395	$	104,694
Noncurrent liabilities	2,054		1,383,704

	December 31, 2022
	SMLP		Obligor Group
	(In thousands)
Assets
Current assets	$	2,553	$	86,443
Noncurrent assets	8,274		2,130,052
Liabilities
Current liabilities	$	16,345	$	79,841
Noncurrent liabilities	2,172		1,410,370

Summarized Statements of Operations Information. For the purposes of the following summarized statements of operations, we allocate a portion of general and administrative expenses recognized at the SMLP parent to the Obligor Group to reflect what those entities' results would have been had they operated on a stand-alone basis. Summarized statements of operations for the years ended December 31, 2023 and 2022 follow.

	December 31, 2023
	SMLP		Obligor Group
	(In thousands)
Total revenues	$	—	$	451,032
Total costs and expenses	3,882		373,245
Loss before income taxes and income from equity method investees	(3,661)		(60,615)
Income from equity method investees	—		22,922
Net loss	$	(3,983)	$	(37,693)

	December 31, 2022
	SMLP		Obligor Group
	(In thousands)
Total revenues	$	—	$	369,592
Total costs and expenses	10,505		411,640
Income (loss) before income taxes and income from equity method investees	(10,505)		(136,912)
Income from equity method investees	—		13,358
Net income (loss)	$	(10,827)	$	(123,554)

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Critical Accounting Estimates

The discussion and analysis of financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires management to make estimates and judgments that affect the amounts of assets, liabilities, revenues and expenses and related disclosure of contingent assets and liabilities. We evaluate our estimates on an on-going basis, based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions. We believe the following describes significant judgments and estimates used in the preparation of our consolidated financial statements.

Long-Lived Assets. Our long-lived assets consist of property, plant and equipment and intangible assets that have been obtained by multiple business combinations and property, plant and equipment that has been constructed in recent years. The initial recording of a majority of these long-lived assets was at fair value, which is estimated by management primarily utilizing market-related information, asset specific information and other projections on the performance of the assets acquired (including an analysis of discounted cash flows which can involve assumptions on weighted average cost of capital and projected cash flows of the assets acquired). Management reviews this information to determine its reasonableness in comparison to the assumptions utilized in determining the purchase price of the assets in addition to other market-based information that was received through the purchase process and other sources. These projections also include projections on potential and contractual obligations assumed in these acquisitions. Due to the imprecise nature of the projections and assumptions utilized in determining fair value, actual results can and often do, differ from our estimates.

As of December 31, 2023, we had net property, plant and equipment with a carrying value of approximately $1.7 billion and net amortizing intangible assets with a carrying value of approximately $175.6 million. When evidence exists that we will not be able to recover a long-lived asset's carrying value through future cash flows, we write down the carrying value of the asset to its estimated fair value. We test assets for impairment when events or circumstances indicate that the carrying value of a long-lived asset may not be recoverable. With respect to property, plant and equipment and our amortizing intangible assets, the carrying value of a long-lived asset is not recoverable if the carrying value exceeds the sum of the undiscounted cash flows expected to result from the asset's use and eventual disposal. In this situation, we would recognize an impairment loss equal to the amount by which the carrying value exceeds the asset's fair value. We determine fair value using a combination of approaches, including a market-based approach and an income-based approach in which we discount the asset's expected future cash flows to reflect the risk associated with achieving the underlying cash flows. Any impairment determinations involve significant assumptions and judgments. Differing assumptions regarding any of these inputs could have a significant effect on the various valuations. As such, the fair value measurements utilized within these estimates are classified as non-recurring Level 3 measurements in the fair value hierarchy because they are not observable from objective sources. Due to the volatility of the inputs used, we cannot predict the likelihood of any future impairment.

We evaluate our equity method investments for impairment when we believe the current fair value may be less than the carrying amount and record an impairment if we believe the decline in value is other than temporary.

Adjustments for MVC Shortfall Payments. For our calculation of segment adjusted EBITDA, we estimate the impact of expected MVC shortfall payments based on assumptions that include, but are not limited to, contract terms, historical volume throughput data, and expectations regarding future investment expenditures, customer drilling activities, and customer production volumes.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

Our current interest rate risk exposure is largely related to our indebtedness. As of December 31, 2023, we had $1.0 billion principal amount of fixed-rate debt, $313.0 million outstanding under our variable rate ABL Facility and $144.8 million outstanding under our variable rate Permian Transmission Term Loan. As of December 31, 2023, we had $130.4 million of interest rate exposure hedged to offset the impact of changes in interest rates on our Permian Transmission Term Loan. While existing fixed-rate debt mitigates the downside impact of fluctuations in interest rates, future issuances of long-term debt could be impacted by increases in interest rates, which could result in higher overall interest costs. In addition, the borrowings under our ABL Facility, which have a variable interest rate, also expose us to the risk of increasing interest rates. For the year ended December 31, 2023, a hypothetical 1% increase (decrease) in interest rates on our variable rate debt would have increased (decreased) our interest expense by approximately $4.6 million assuming no changes in amounts drawn or other variables under our ABL Facility or Permian Transmission Term Loan.

Commodity Price Risk

We generate a majority of our revenues pursuant to primarily long-term and fee-based gathering agreements, many of which include MVCs and AMIs. Currently, our direct commodity price exposure relates to (i) the sale of physical natural gas and/or NGLs purchased under percentage-of-proceeds and other processing arrangements with certain of our customers in the Rockies and Piceance segments, (ii) the sale of natural gas we retain from certain Barnett segment customers and (iii) the sale of condensate we retain from certain gathering services in the Piceance segment. Our gathering agreements with certain Barnett 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. 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 Henry Hub Index. We sell retainage natural gas at prices that are based on the Atmos Zone 3 Index. By basing the power prices on a system and basin-relevant market, we are able to closely associate the relationship between the compression electricity expense and natural gas retainage sales. We do not enter into risk management contracts for speculative purposes.

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Item 8. Financial Statements and Supplementary Data.

Report of Independent Registered Public Accounting Firm (PCAOB ID No. 34)	97
Consolidated Balance Sheets	99
Consolidated Statements of Operations	100
Consolidated Statements of Partners' Capital	101
Consolidated Statements of Cash Flows	102
Notes to Consolidated Financial Statements	103

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of Summit Midstream, GP, LLC and the unitholders of Summit Midstream Partners, LP

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Summit Midstream Partners, LP and subsidiaries (the "Partnership") as of December 31, 2023 and 2022, the related consolidated statements of operations, partners' capital, and cash flows, for each of the two years in the period ended December 31, 2023, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Partnership as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 15, 2024, expressed an unqualified opinion on the Partnership's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Partnership's management. Our responsibility is to express an opinion on the Partnership's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matter does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Property, Plant and Equipment, Net - Determination of Impairment Indicators– Refer to Notes 2 and 5 to the financial statements

Critical Audit Matter Description

As described in Notes 2 and 5 to the Partnership's consolidated financial statements, the Partnership recorded approximately $1.7 billion of property, plant and equipment, net as of December 31, 2023. The Partnership tests assets for impairment when events or circumstances indicate the carrying value of a long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If the Partnership concludes that an asset’s carrying value will not be recovered through future cash flows, the Partnership recognizes an impairment loss on the long-lived asset equal to the amount by which the carrying value exceeds its fair value.

We have identified the determination of impairment indicators for long-lived assets as a critical audit matter due to the significant judgments management makes when determining whether events or changes in circumstances have occurred indicating that the carrying amounts of long-lived assets may not be recoverable. Auditing management’s judgements involved especially challenging auditor judgment due to the nature and extent of audit effort required to address these matters, including the degree of auditor judgment and the extent of specialized knowledge needed.

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How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the identification of impairment indicators for long-lived assets included the following, among others:

•We tested the effectiveness of internal controls over financial reporting related to management’s identification of possible impairment indicators for long-lived assets that may indicate the carrying amount of long-lived assets may not be recoverable.

•We evaluated management’s analysis of impairment indicators by:

◦Assessing whether long-lived assets having indicators of impairment were appropriately identified.

◦Considering industry and analysts reports and the impact of macroeconomic factors, such as adverse changes in the regulatory environment, legislation or other factors that may represent impairment indicators not previously contemplated in management's analysis.

◦Evaluating management’s judgments around historical trends, macroeconomic and industry conditions, and whether projections are consistent with the Partnership’s operating strategy.

◦Inquiry of management over whether long-lived assets may be sold or otherwise disposed of significantly before the end of the assets' previously estimated useful life.

◦Inspecting minutes of the board of directors and committees of executive management to understand if there were factors that would represent potential impairment indicators for long-lived assets.

/s/ Deloitte & Touche LLP

Houston, Texas

March 15, 2024

We have served as the Partnership's auditor since 2009.

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31, 2023		December 31, 2022
	(In thousands, except unit amounts)
ASSETS
Cash and cash equivalents	$	14,044	$	11,808
Restricted cash	2,601		1,723
Accounts receivable	76,275		75,287
Other current assets	5,502		8,724
Total current assets	98,422		97,542
Property, plant and equipment, net	1,698,585		1,718,754
Intangible assets, net	175,592		198,718
Investment in equity method investees	486,434		506,677
Other noncurrent assets	35,165		38,273
TOTAL ASSETS	$	2,494,198	$	2,559,964
LIABILITIES AND CAPITAL
Trade accounts payable	$	22,714	$	14,052
Accrued expenses	32,377		20,601
Deferred revenue	10,196		9,054
Ad valorem taxes payable	8,543		10,245
Accrued compensation and employee benefits	6,815		16,319
Accrued interest	19,298		17,355
Accrued environmental remediation	1,483		1,365
Accrued settlement payable	6,667		6,667
Current portion of long-term debt	15,524		10,507
Other current liabilities	10,395		11,724
Total current liabilities	134,012		117,889
Long-term debt, net	1,455,166		1,479,855
Noncurrent deferred revenue	30,085		37,694
Noncurrent accrued environmental remediation	1,454		2,340
Other noncurrent liabilities	30,266		38,784
Total liabilities	1,650,983		1,676,562
Commitments and contingencies (Note 10)
Mezzanine Capital
Subsidiary Series A Preferred Units (93,039 units issued and outstanding at December 31, 2023 and December 31, 2022)	124,652		118,584
Partners Capital
Series A Preferred Units (65,508 units issued and outstanding at December 31, 2023 and December 31, 2022)	96,893		85,327
Common limited partner capital (10,376,189 and 10,182,763 units issued and outstanding at December 31, 2023 and December 31, 2022, respectively)	621,670		679,491
Total partners capital	718,563		764,818
TOTAL LIABILITIES AND CAPITAL	$	2,494,198	$	2,559,964

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

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

	Year ended December 31,
	2023		2022
	(In thousands, except per-unit amount)
Revenues:
Gathering services and related fees	$	248,223	$	248,358
Natural gas, NGLs and condensate sales	179,254		86,225
Other revenues	31,426		35,011
Total revenues	458,903		369,594
Costs and expenses:
Cost of natural gas and NGLs	112,462		76,826
Operation and maintenance	100,741		84,152
General and administrative	42,135		44,943
Depreciation and amortization	122,764		119,055
Transaction costs	1,251		6,968
Acquisition integration costs	2,654		—
Gain on asset sales, net	(260)		(507)
Long-lived asset impairment	540		91,644
Total costs and expenses	382,287		423,081
Other income (expense), net	865		(4)
Gain on interest rate swaps	1,830		16,414
Loss on sale of business	(47)		(1,741)
Interest expense	(140,784)		(102,459)
Loss on early extinguishment of debt	(10,934)		—
Loss before income taxes and equity method investment income	(72,454)		(141,277)
Income tax expense	(322)		(325)
Income from equity method investees	33,829		18,141
Net loss	$	(38,947)	$	(123,461)
Less: Net income attributable to Subsidiary Series A Preferred Units	(12,581)		(17,144)
Net loss attributable to Summit Midstream Partners, LP	$	(51,528)	$	(140,605)
Less: net income attributable to Series A Preferred Units	(11,566)		(8,048)
Add: deemed capital contribution	—		20,974
Net loss attributable to common limited partners	$	(63,094)	$	(127,679)
Net loss per limited partner unit:
Common unit – basic	$	(6.11)	$	(12.71)
Common unit – diluted	$	(6.11)	$	(12.71)
Weighted-average limited partner units outstanding:
Common units – basic	10,334		10,048
Common units – diluted	10,334		10,048

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

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CONSOLIDATED STATEMENTS OF PARTNERS CAPITAL

	Partners Capital
	Series A Preferred Units		Common Limited Partner Capital		Total
	(In thousands)
Partners capital, December 31, 2021	$	169,769	$	734,594	$	904,363
Net income (loss)	8,145		(148,743)		(140,598)
Unit-based compensation	—		3,778		3,778
Tax withholdings and associated payments on vested SMLP LTIP awards	—		(1,198)		(1,198)
Tax withholdings on 2022 Preferred Exchange Offer	—		(2,652)		(2,652)
LTIP cash to equity conversion	—		1,125		1,125
Effect of 2022 Preferred Exchange Offer, inclusive of a $20.9 million deemed contribution to common unit holders	(92,587)		92,587		—
Partners capital, December 31, 2022	$	85,327	$	679,491	$	764,818
Net income (loss)	11,566		(63,094)		(51,528)
Unit-based compensation	—		6,566		6,566
Tax withholdings and associated payments on vested SMLP LTIP awards	—		(1,293)		(1,293)
Partners capital, December 31, 2023	$	96,893	$	621,670	$	718,563

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

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CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year ended December 31,
	2023		2022
	(In thousands)
Cash flows from operating activities:
Net loss	$	(38,947)	$	(123,461)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	123,702		119,993
Noncash lease expense	3,773		885
Amortization of debt issuance costs	12,685		9,326
Unit-based and noncash compensation	6,566		3,778
Income from equity method investees	(33,829)		(18,141)
Distributions from equity method investees	57,572		43,040
Gain on asset sales, net	(260)		(507)
Foreign currency gain	(102)		—
Loss on earn-out	599		—
Loss on sale of business	47		1,741
Loss on extinguishment of debt	10,934		—
Unrealized (gain) loss on interest rate swaps	3,318		(16,016)
Long-lived asset impairment	540		91,644
Changes in operating assets and liabilities:
Accounts receivable	(3,352)		284
Trade accounts payable	4,483		2,248
Accrued expenses	5,586		(2,780)
Deferred revenue	(6,467)		(6,082)
Ad valorem taxes payable	(1,702)		14
Accrued interest	1,943		4,618
Accrued environmental remediation, net	(768)		(1,901)
Other, net	(19,415)		(9,939)
Net cash provided by operating activities	126,906		98,744
Cash flows from investing activities:
Capital expenditures	(68,905)		(30,472)
Cash consideration paid for the acquisition of Outrigger DJ, net of cash acquired	—		(166,631)
Cash consideration paid for the acquisition of Sterling DJ, net of cash acquired	—		(139,896)
Proceeds from sale of Lane G&P System, net of cash sold in transaction	—		75,020
Proceeds from sale of Bison Midstream, net of cash sold in transaction	—		38,920
Proceeds from asset sale	260		4,945
Investment in Double E equity method investee	(3,500)		(8,444)
Other, net	(2,611)		—
Net cash used in investing activities	(74,756)		(226,558)
Cash flows from financing activities:
Borrowings on 2026 Unsecured Notes	29,480		—
Repurchase of 2025 Senior Notes	(29,650)		—
Borrowings on 2026 Secured Notes	—		84,371
Repayments on Permian Transmission Term Loan	(10,507)		(4,647)
Borrowings on ABL Facility	70,000		293,000
Repayments on ABL Facility	(87,000)		(230,000)
Debt issuance costs	(2,968)		(14,409)
Debt extinguishment costs	(10,306)		—
Distributions on Subsidiary Series A Preferred Units	(6,512)		(3,257)
Other, net	(1,573)		(3,285)
Net cash provided by financing activities	(49,036)		121,773
Net change in cash, cash equivalents and restricted cash	3,114		(6,041)
Cash, cash equivalents and restricted cash, beginning of period	13,531		19,572
Cash, cash equivalents and restricted cash, end of period	$	16,645	$	13,531

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

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SUMMIT MIDSTREAM PARTNERS, LP AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

Organization. Summit Midstream Partners, LP (including its subsidiaries, collectively “SMLP” or the “Partnership”) is a Delaware limited partnership that was formed in May 2012 and began operations in October 2012. SMLP is a value-oriented limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States. The Partnership’s business activities are primarily conducted through various operating subsidiaries, each of which is owned or controlled by its wholly owned subsidiary holding company, Summit Holdings, a Delaware limited liability company. As of December 31, 2023, the Partnership indirectly owns its General Partner, and the General Partner is a wholly owned, indirect subsidiary of the Partnership. The General Partner has no assets or liabilities and holds the non-economic general partner interest in the Partnership.

Business Operations. The Partnership provides natural gas gathering, compression, treating and processing services as well as crude oil and produced water gathering services pursuant to primarily long-term, fee-based agreements with its customers. In addition to these services, the Partnership also provides freshwater delivery services pursuant to short-term agreements with customers. The Partnership’s results are primarily driven by the volumes of natural gas that it gathers, compresses, treats and/or processes as well as by the volumes of crude oil and produced water that it gathers. Other than the Partnership’s investments in Double E and Ohio Gathering, all of its business activities are conducted through wholly owned operating subsidiaries.

Presentation and Consolidation. The Partnership prepares its consolidated financial statements in accordance with GAAP as established by the FASB. The Partnership makes 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 revenues and expenses and the disclosure of commitments and contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.

The consolidated financial statements include the assets, liabilities and results of operations of SMLP and its subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. Comprehensive income or loss is the same as net income or loss for all periods presented.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP

Cash, Cash Equivalents and Restricted Cash. The Partnership considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. Cash that is held by a major bank and has restrictions on its availability to the Partnership is classified as restricted cash. The restricted cash balance of $2.6 million and $1.7 million at December 31, 2023 and 2022, respectively, is related to proceeds which are available to finance Permian Transmission’s debt service or other general corporate purposes of Permian Transmission. See Note 9 - Debt for additional information.

Accounts Receivable. Accounts receivable relate to gathering and other services provided to the Partnership’s customers and other counterparties. The Partnership evaluates the collectability of its accounts receivable and the need for an allowance for doubtful accounts based on customer-specific facts and circumstances. To the extent the collectability of a specific customer or counterparty receivable is doubtful, the Partnership recognizes an allowance for doubtful accounts. Uncollectible receivables are written off when a settlement is reached for an amount that is less than the outstanding historical balance or a receivable amount is deemed otherwise unrealizable.

Property, Plant and Equipment. The Partnership records property, plant and equipment at historical cost of construction or fair value of the assets at acquisition. The Partnership capitalizes expenditures that extend the useful life of an asset or enhance its productivity or efficiency from its original design over the expected remaining period of use. For maintenance and repairs that do not add capacity or extend the useful life of an asset, the Partnership recognizes expenditures as an expense as incurred. The Partnership capitalizes project costs incurred during construction, including interest on funds borrowed to finance the construction of facilities and pipelines, as construction in progress. Accrued capital expenditures are reflected in trade accounts payable.

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The Partnership records depreciation on a straight-line basis over an asset’s estimated useful life and bases its estimates for useful life on various factors including age (in the case of acquired assets), manufacturing specifications, technological advances and historical data concerning useful lives of similar assets. Estimates of useful lives follow.

	Useful lives (In years)
Gathering and processing systems and related equipment	12-30
Other	3-15

Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Land and line fill are not depreciated.

The Partnership bases an asset’s carrying value on estimates, assumptions and judgments for useful life and salvage value. Upon sale, retirement or other disposal, the Partnership removes the carrying value of an asset and its accumulated depreciation from its balance sheet and recognizes the related gain or loss, if any.

Asset Retirement Obligations. The Partnership records a liability for asset retirement obligations only if and when a future asset retirement obligation with a determinable life is identified. For identified asset retirement obligations, the Partnership evaluates whether the expected retirement date and related costs of retirement can be estimated. The Partnership has concluded that its gathering and processing assets have an indeterminate life because they are owned and will operate for an indeterminate period when properly maintained. Because the Partnership does not have sufficient information to reasonably estimate the amount or timing of such obligations and does not have any current plan to discontinue use of any significant assets, the Partnership did not provide for any asset retirement obligations as of December 31, 2023 or 2022.

Amortizing Intangibles. The Partnership has certain acquired gas gathering contracts that had above-market pricing structures at the acquisition date and the Partnership amortizes these favorable contracts using a straight-line method over the contract’s estimated useful life. The Partnership defines useful life as the period over which the contract is expected to contribute to the Partnership’s future cash flows. These favorable contracts have original terms ranging from 10 years to 20 years and the Partnership recognizes the amortization expense associated with these contracts in Other revenues.

The Partnership amortizes all other gas gathering contracts, or contract intangibles, over the period of economic benefit based upon expected revenues over the life of the contract. The useful life of these contracts ranges from 3 years to 25 years. The Partnership recognizes the amortization expense associated with these contracts in Depreciation and amortization expense.

The Partnership also has rights-of-way associated with municipal easements and easements granted within existing rights-of-way. The Partnership amortizes these intangible assets over the shorter of the contractual term of the rights-of-way or the estimated useful life of the gathering system. The contractual terms of the rights-of-way range from 20 years to 30 years and the Partnership recognizes the amortization expense associated with these rights-of-way assets in Depreciation and amortization expense.

Equity Method Investments. The Partnership accounts for investments in which it exercises significant influence using the equity method so long as it (i) does not control the investee and (ii) is not the primary beneficiary. The Partnership reflects these investments in its consolidated balance sheets under the caption titled “investment in equity method investees.”

The Partnership recognizes an other-than-temporary impairment for losses in the value of equity method investees when evidence indicates that the carrying amount is no longer supportable. Evidence of a loss in value might include, but is not limited to, absence of an ability to recover the carrying amount of the investment or an inability of the equity method investee to sustain an earnings capacity that would justify the carrying amount of the investment. A current fair value of an investment that is less than its carrying amount may indicate a loss in value of the investment. The Partnership evaluates its equity method investments for impairment whenever a triggering event exists that would indicate a need to assess the investment for potential impairment.

Impairment of Long-Lived Assets. The Partnership tests assets for impairment when events or circumstances indicate the carrying value of a long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If the Partnership concludes that an asset’s carrying value will not be recovered through future cash flows, the Partnership recognizes an impairment loss on the long-lived asset equal to the amount by which the carrying value exceeds its fair value. The Partnership determines fair value using a combination of market-based and income-based approaches.

Environmental Matters. The Partnership is subject to various federal, state and local laws and regulations relating to the protection of the environment. 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. The Partnership accrues

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for losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Such accruals are adjusted as further information develops or circumstances change. Recoveries of environmental remediation costs from other parties or insurers are recorded as assets when their realization is assured beyond a reasonable doubt.

Commitments and Contingencies. When required, the Partnership records accruals for loss contingencies in accordance with FASB ASC 450, Contingencies. Such determinations are subject to interpretations of current facts and circumstances, forecasts of future events and estimates of the financial impacts of such events.

Mezzanine Capital. A noncontrolling interest is reported as a component of equity unless the noncontrolling interest is considered redeemable, in which case the noncontrolling interest is recorded between liabilities and equity (mezzanine or temporary equity) in the Partnership’s consolidated balance sheet.

Revenue. The Partnership provides gathering and/or processing services principally under contracts that contain one or more of the following arrangements described below:

•Fee-based arrangements. Under fee-based arrangements, the Partnership receives a fee or fees for one or more of the following services (i) natural gas gathering, treating, transporting, compressing and/or processing and (ii) crude oil and/or produced water gathering and (iii) fresh water delivery services.

•Percent-of-proceeds arrangements. Under percent-of-proceeds arrangements, the Partnership generally purchases natural gas from producers at the wellhead, or other receipt points, gathers the wellhead natural gas through its gathering system, treats and compresses the natural gas, processes the natural gas and/or sells the natural gas to a third party for processing. The Partnership then remits to its producers an agreed-upon percentage of the actual proceeds received from sales of the residue natural gas and NGLs. Certain of these arrangements may also result in returning all or a portion of the residue natural gas and/or the NGLs to the producer, in lieu of returning sales proceeds. The margins earned are directly related to the volume of natural gas that flows through the system and the price at which the Partnership is able to sell the residue natural gas and NGLs.

The majority of the Partnership’s contracts have a single performance obligation which is either to provide gathering services (an integrated service) or sell natural gas, NGLs and condensate, which are both satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. The Partnership also has certain contracts with multiple performance obligations. They include an option for the customer to acquire additional services such as contracts containing MVCs. These performance obligations would also be satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. In these instances, the Partnership allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each service in the contract.

Performance obligations for gathering services are generally satisfied over time. The Partnership utilizes either an output method (i.e., measure of progress) for guaranteed, stand-ready service contracts or an asset/system delivery time estimate for non-guaranteed, as-available service contracts.

Performance obligations for the sale of natural gas, NGLs and condensate are satisfied at a point in time. There are no significant judgments for these transactions because the customer obtains control based on an agreed upon delivery point.

Services are typically billed on a monthly basis and the Partnership does not offer extended payment terms. The Partnership does not have contracts with financing components.

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For the contracts described above, the Partnership reflects its revenues in the financial statement captions described below.

Financial statement caption:	Revenue description:
Revenues:
Gathering services and related fees	•Revenue earned from fee-based gathering, compression, treating and processing services;
Natural gas, NGLs and condensate sales	•Revenue from the sale of physical natural gas purchased from customers percent-of- proceeds arrangements (Costs are presented within cost of natural gas and NGLs); •Revenue from sale of condensate and NGLs retained from gathering services (Costs are presented within operation and maintenance expense);
Other revenues	•Reimbursements to the Partnership for costs incurred by the Partnership on customer’s behalf (Recorded on a gross basis with corresponding costs included in operations and maintenance expense); •Revenue for freshwater deliveries; •Contract amortization; and •Revenue for management fees related to Double E.

Certain of the Partnership’s gathering and/or processing agreements provide for monthly MVCs. Under these MVCs, customers agree to ship and/or process a minimum volume of production on its 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 the Partnership at the end of the contracted measurement period if its actual throughput volumes are less than its contractual MVC for that period. Certain customers are entitled to utilize shortfall payments to offset gathering fees in one or more subsequent contracted measurement periods to the extent that such customers throughput volumes in a subsequent contracted measurement period exceed its MVC for that contracted measurement period. The amount of the shortfall payment is based on the difference between the actual throughput volume shipped and/or processed for the applicable period and the MVC for the applicable period, multiplied by the applicable gathering or processing fee.

Many of the Partnership’s gas gathering agreements contain provisions that can reduce or delay the cash flows that it expects to receive from MVCs to the extent that a customer's actual throughput volumes are above or below its MVC for the applicable contracted measurement period. These provisions include the following: 

•To the extent that a customer's throughput volumes are less than its MVC for the applicable period and the customer makes a shortfall payment, it may be entitled to an offset in one or more subsequent periods to the extent that its throughput volumes in subsequent periods exceed its MVC for those periods. In such a situation, the Partnership would not receive gathering fees on throughput in excess of that customer's MVC (depending on the terms of the specific gas gathering agreement) to the extent that the customer had made a shortfall payment with respect to one or more preceding measurement periods (as applicable).

•To the extent that a customer's throughput volumes exceed its MVC in the applicable contracted measurement period, it may be entitled to apply the excess throughput against its aggregate MVC, thereby reducing the period for which its annual MVC applies. As a result of this mechanism, the weighted-average remaining period for which the Partnership’s MVCs apply will be less than the weighted-average of the originally stated MVC contractual terms.

•To the extent that certain of the Partnership’s customers' throughput volumes exceed its MVC for the applicable period, there is a crediting mechanism that allows the customer to build a bank of credits that it can utilize in the future to reduce shortfall payments owed in subsequent periods, subject to expiration if there is no shortfall in subsequent periods. The period over which this credit bank can be applied to future shortfall payments varies, depending on the particular gas gathering agreement.

The Partnership recognizes customer obligations under their MVCs as revenue and contract assets when (i) it considers it remote that the customer will utilize shortfall payments to offset gathering or processing fees in excess of its MVCs in subsequent periods; (ii) the customer incurs a shortfall in a contract with no banking mechanism or claw back provision; (iii) the customer’s banking mechanism has expired; or (iv) it is remote that the customer will use its unexercised right. In making

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this determination, the Partnership considers both quantitative and qualitative facts and circumstances, including, but not limited to, contract terms, capacity of the associated pipeline or receipt point and/or expectations regarding future investment, drilling and production.

The majority of the Partnership’s revenue is derived from long-term, fee-based contracts with its customers, which include original terms of up to 25 years. The Partnership recognizes revenue earned from fee-based gathering, compression, treating and processing services in gathering services and related fees. The Partnership also earns revenue in the Rockies and Piceance reporting segments from the sale of physical natural gas purchased from its customers under certain percent-of-proceeds arrangements. Under ASC Topic 606, these gathering contracts are presented net within cost of natural gas and NGLs. The Partnership sells natural gas that it retains from certain customers in the Barnett reporting segment to offset the power expenses, included in operations and maintenance expense, of the electric-driven compression on the gathering system. The Partnership also sells condensate and NGLs retained from certain of its gathering services in the Piceance and Rockies reporting segments. Revenues from the sale of natural gas and condensate are recognized in Natural gas, NGLs and condensate sales; the associated expense is included in Operation and maintenance expense. Certain customers reimburse the Partnership for costs incurred on their behalf. The Partnership records costs incurred and reimbursed by its customers on a gross basis, with the revenue component recognized in Other revenues and the associated expense included in operations and maintenance expense.

The transaction price in the Partnership’s contracts is primarily based on the volume of natural gas, crude oil or produced water transferred by its gathering systems to the customer’s agreed upon delivery point multiplied by the contractual rate. For contracts that include MVCs, variable consideration up to the MVC will be included in the transaction price. For contracts that do not include MVCs, the Partnership does not estimate variable consideration because the performance obligations are completed and settled on a daily basis. For contracts containing noncash consideration such as fuel received in-kind, the Partnership measures the transaction price at the point of sale when the volume, mix and market price of the commodities are known.

The Partnership has contracts with MVCs that are variable and constrained. Contracts with longer than monthly MVCs are reviewed on a quarterly basis and adjustments to those estimates are made during each respective reporting period, if necessary.

The transaction price is allocated if the contract contains more than one performance obligation such as contracts that include MVCs. The transaction price allocated is based on the MVC for the applicable measurement period.

Unit-Based Compensation. For awards of unit-based compensation, the Partnership determines a grant date fair value and recognizes the related compensation expense in the statements of operations over the vesting period for each respective award.

Income Taxes. The Partnership is generally not subject to federal and state income taxes, except as noted below. However, its unitholders are individually responsible for paying federal and state income taxes on their share of its taxable income. Net income or loss for GAAP purposes may differ significantly from taxable income reportable to its unitholders as a result of differences between the tax basis and the GAAP basis of assets and liabilities and the taxable income allocation requirements of the Partnership’s governing documents. The aggregate difference in the basis of the Partnership’s net assets for financial and income tax purposes cannot be readily determined as the Partnership does not have access to the information about each partner’s tax attributes related to the Partnership.

In general, legal entities that are chartered, organized or conducting business in the state of Texas are subject to a 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. The Partnership’s financial statements reflect provisions for these tax obligations.

Interest Rate Swaps. Interest rate swap agreements are reported as either assets or liabilities on the consolidated balance sheet at fair value. Interest rate swap agreements are not designated as cash-flow hedges, and accordingly, the changes in the fair value are recorded in earnings. The Partnership does not use interest rate swap agreements for speculative purposes.

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Accounting standards recently implemented. ASU No. 2020-4 Reference Rate Reform (“ASU 2020-4”). ASU 2020-4 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform on financial reporting. Contract terms that are modified due to the replacement of a reference rate are not required to be remeasured or reassessed under relevant accounting standards. During the quarter ended June 30, 2023, the Partnership amended the terms of its Permian Transmission Credit Facility and Term Loan and interest rate swaps, which replaced its existing LIBOR based terms with SOFR rate terms. The amendments in ASU 2020-4 are effective as of March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU 2022-06, which amended Topic 848 to defer the sunset date to apply the practical expedients until December 31, 2024. The impact of the change in reference rate did not have a material impact on the Partnership’s consolidated financial statements. See Note 9 - Debt, for additional information.

New accounting standards not yet implemented in this Annual Report. ASU No. 2020-06 Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815 – 40) (“ASU 2020-06”). ASU 2020-06 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The ASU is part of the FASB’s simplification initiative, which aims to reduce unnecessary complexity in GAAP. The ASU’s amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. The Partnership does not expect the provisions of ASU 2020-06 will have a material impact on its consolidated financial statements and disclosures.

ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 enhances disclosures on reportable segments and provides additional detailed information about significant segment expenses. The guidance in ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Partnership continues to assess the impact of the new guidance, but does not expect the provisions of ASU 2023-07 will have a material impact on its consolidated financial statements and disclosures.

3. ACQUISTIONS AND DIVESTITURES

Acquisition of Outrigger DJ. On December 1, 2022, the Partnership completed the acquisition of 100% of the equity interests of Outrigger DJ Midstream LLC (“Outrigger DJ”) from Outrigger Energy II LLC for cash consideration of $165.0 million, subject to customary working capital adjustments. The acquisition of Outrigger DJ constituted a business combination and was accounted for using the acquisition method of accounting. For tax purposes, the acquisition was accounted for as an acquisition of assets. The acquisition significantly increased the Partnership’s gas processing capacity and footprint in the DJ Basin and diversified its customer base.

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Outrigger DJ Acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Outrigger DJ	$	167,631
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	1,000
Accounts receivable	7,529
Other current assets	190
Property, plant and equipment, net	144,514
Intangible assets	21,447
Trade accounts payable, accrued expenses and other	(7,049)
Net assets acquired and liabilities assumed	$	167,631

The assets acquired and liabilities assumed were recorded at their estimated fair values at the date of the acquisition. Acquired working capital amounts are expected to approximate fair value due to their short-term nature. The valuation of certain assets, including property, are based on appraisals. The fair value of acquired equipment is based on both available market data and cost and income approaches. These methods are considered Level 3 fair value estimates and include significant assumptions of future gathering and processing volumes, commodity prices, and operating and capital cost estimates, discounted using weighted average cost of capital for industry peers.

Intangible assets acquired consist of rights-of-way of $21.4 million with a weighted average amortization period of 30 years.

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Acquisition of Sterling DJ. On December 1, 2022, the Partnership completed the acquisition of 100% of the equity interests in each of Sterling Energy Investments LLC, Grasslands Energy Marketing LLC and Centennial Water Pipelines LLC (collectively, “Sterling DJ”) from Sterling Investment Holdings LLC for cash consideration of $140.0 million, subject to customary working capital adjustments.. The acquisition of Sterling DJ constituted a business combination and was accounted for using the acquisition method of accounting. For tax purposes, the acquisition was accounted for as an acquisition of assets. The acquisition significantly increased the Partnership’s gas processing capacity and footprint in the DJ Basin and diversified its customer base.

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Sterling DJ acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Sterling DJ	$	140,396
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	500
Accounts receivable	16,224
Other current assets	4,557
Property, plant and equipment, net	108,720
Intangible assets	38,678
Other noncurrent assets	9,865
Trade accounts payable, accrued expenses and other	(38,148)
Net assets acquired	$	140,396

The assets acquired and liabilities assumed were recorded at their estimated fair values at the date of the acquisition. Acquired working capital amounts are expected to approximate fair value due to their short-term nature. The valuation of certain assets, including property, are based on appraisals. The fair value of acquired equipment is based on both available market data and cost and income approaches. These methods are considered Level 3 fair value estimates and include significant assumptions of future gathering and processing volumes, commodity prices, and operating and capital cost estimates, discounted using weighted average cost of capital for industry peers.

Intangible assets acquired consist of rights-of-way of $30.2 million with a weighted average amortization period of 30 years and indefinite-lived intangible assets of $8.4 million.

Divestiture of Lane G&P System. On June 30, 2022, the Partnership completed the sale of Summit Permian, which owns the Lane Gathering and Processing System (“Lane G&P System”), and Permian Finance to Longwood Gathering and Disposal Systems, LP (“Longwood”), a wholly owned subsidiary of Matador ͏Resources Company (“Matador”). In connection with the transaction, the Partnership released, to a subsidiary of Matador, and Matador agreed to assume, take or-pay firm capacity on the Double E Pipeline.

During 2022, the Partnership recognized an impairment of $84.5 million related to the disposition of the Lane G&P System based on total cash proceeds received of $75.0 million, including $2.0 million of cash sold in the transaction, net assets of $158.3 million, and other costs to sell of $1.2 million.

Divestiture of Bison Midstream. On September 19, 2022, the Partnership completed the sale of Bison Midstream, LLC (“Bison Midstream”), its gas gathering system in Burke and Mountrail Counties, North Dakota to a subsidiary of Steel Reef Infrastructure Corp. (“Steel Reef”), an integrated owner and operator of associated gas capture, gathering and processing assets in North Dakota and Saskatchewan.

During 2022, the Partnership recognized an impairment of $6.9 million related to the disposition of Bison Midstream based on total cash proceeds received of $38.9 million and net assets of $45.8 million. The cash proceeds were used to reduce amounts outstanding under the ABL Facility.

Pro Forma Information (Unaudited). The following table summarizes the unaudited pro forma condensed financial information of SMLP as if the acquisitions of Outrigger DJ and Sterling DJ, along with the dispositions of Bison Midstream and the Lane G&P System, had occurred on January 1, 2021:

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	Year Ended December 31, 2022
Revenues	$	543,024
Net loss	$	(36,945)

The unaudited pro forma information is for informational purposes only and is not necessarily indicative of the operating results that would have occurred had the transactions been completed at January 1, 2021, nor is it necessarily indicative of future operating results. The financial data was adjusted to give effect to pro forma events that are i) directly attributable to the transactions, ii) factually supportable, and iii) expected to have a continuing impact on the consolidated results of operations.

Significant adjustments to the pro forma information above include adjustments to interest expense and depreciation based on the purchase price allocated to property, plant, and equipment.

4. REVENUE

The following table presents estimated revenue expected to be recognized over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated MVC shortfall payments.

The Partnership applies the practical expedient in paragraph 606-10-50-14 of Topic 606 for certain arrangements that are considered optional purchases (i.e., there is no enforceable obligation for the customer to make purchases) and those amounts are therefore excluded from the table.

	2024		2025		2026		2027		2028		Thereafter
	(in thousands)
Gathering services and related fees	$	65,472	$	45,594	$	29,292	$	7,685	$	5,137	$	—

Revenue by Category. In the following table, revenue is disaggregated by geographic area and major products and services. For more detailed information about reportable segments, see Note 17 -Segment Information.

	Year ended December 31, 2023
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	63,805	$	—	$	—	$	63,805
Rockies	65,869		173,688		15,474		255,031
Permian	—		—		3,570		3,570
Piceance	81,041		4,788		5,588		91,417
Barnett	37,508		778		6,831		45,117
Total reportable segments	248,223		179,254		31,463		458,940
Corporate and other	—		—		(37)		(37)
Total	$	248,223	$	179,254	$	31,426	$	458,903

	Year ended December 31, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	54,392	$	—	$	—	$	54,392
Rockies	67,838		59,208		16,557		143,603
Permian	3,668		17,382		4,101		25,151
Piceance	80,630		7,111		5,608		93,349
Barnett	41,830		2,503		7,763		52,096
Total reportable segments	248,358		86,204		34,029		368,591
Corporate and other	—		21		982		1,003
Total	$	248,358	$	86,225	$	35,011	$	369,594

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5. PROPERTY, PLANT AND EQUIPMENT

Details on the Partnership’s property, plant and equipment follow.

	December 31, 2023		December 31, 2022
	(In thousands)
Gathering and processing systems and related equipment	$	2,335,980	$	2,262,330
Construction in progress	56,064		59,036
Land and line fill	11,534		11,756
Other	65,029		62,222
Total	2,468,607		2,395,344
Less accumulated depreciation	(770,022)		(676,590)
Property, plant and equipment, net	$	1,698,585	$	1,718,754

When the carrying amount of a long-lived asset is not recoverable, an impairment is recognized equal to the excess of the asset’s carrying value over its fair value, which is based on inputs that are not observable in the market, and thus represent Level 3 inputs under GAAP’s fair value hierarchy. The Partnership recognized $0.5 million and $91.6 million of impairments during the fiscal years ended December 31, 2023 and 2022, respectively. The Partnership cannot predict the likelihood of future impairments, if any.

Depreciation expense and capitalized interest for the Partnership follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation expense	$	95,307	$	93,457
Capitalized interest	1,284		838

6. INTANGIBLE ASSETS

Details regarding the Partnership’s intangible assets follow.

	December 31, 2023
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(15,747)	$	5,316
Contract intangibles	270,412		(247,024)		23,388
Rights-of-way	205,358		(66,906)		138,452
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	505,269	$	(329,677)	$	175,592

	December 31, 2022
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(14,809)	$	6,254
Contract intangibles	270,412		(228,143)		42,269
Rights-of-way	200,089		(58,330)		141,759
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	500,000	$	(301,282)	$	198,718

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The Partnership recognized amortization expense of its favorable gas gathering contracts in Other revenues as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – favorable gas gathering contracts	$	938	$	938

The Partnership recognized amortization expense of its contract and right of way intangibles in costs and expenses as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – contract intangibles	$	18,881	$	18,935
Amortization expense – rights-of-way	8,576		6,527

The Partnership’s estimated aggregate annual amortization expected to be recognized for each of the five succeeding fiscal years and thereafter, as of December 31, 2023, follows.

	(In thousands)
2024	$	18,076
2025	17,892
2026	14,867
2027	8,878
2028	8,711
Thereafter	98,732
	$	167,156

7. EQUITY METHOD INVESTMENTS

The Partnership has equity method investments in Double E and Ohio Gathering, the balances of which are included in the Investment in equity method investees caption on the consolidated balance sheets. Details of the Partnership’s equity method investments follows.

	December 31, 2023		December 31, 2022
	(In thousands)
Double E (1)	$	276,221	$	281,640
Ohio Gathering	210,213		225,037
Total	$	486,434	$	506,677

(1) The Partnership’s investment balance in Double E includes capitalized interest costs.

Double E. The Partnership, through its wholly owned subsidiary Summit Permian Transmission, LLC, has a 70% ownership in Double E Pipeline, LLC (“Double E”). Double E owns a long-haul natural gas pipeline (the “Double E Pipeline”) that provides transportation service for residue natural gas from multiple receipt points in the Delaware Basin to various delivery points in and around the Waha hub in Texas. The Double E Pipeline commenced operations in November 2021 and during the years ended December 31, 2023 and 2022, the Partnership made cash investments of $3.5 million and $8.4 million, respectively, in Double E. During the year ended December 31, 2023, Double E made distributions to its investors totaling $28.3 million of which the Partnership received $19.8 million, of which all amounts were utilized for payment of interest and principal on the Permian Transmission Term Loan and distributions to the holders of the Subsidiary Series A Preferred Units.

Double E is deemed to be a variable interest entity as defined in GAAP. Summit Permian Transmission was not deemed to be the primary beneficiary of Double E due to the voting rights of Double E’s other owner regarding significant matters. The Partnership accounts for its ownership interest in Double E as an equity method investment because it has significant influence over Double E.

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Summarized balance sheet information for Double E follows (amounts represent 100% of investee financial information).

	December 31, 2023		December 31, 2022
	(In thousands)
Current assets	$	11,410	$	5,121
Noncurrent assets	391,777		403,594
Total assets	$	403,187	$	408,715
Current liabilities	$	6,373	$	8,635
Noncurrent liabilities	13,727		9,137
Total liabilities	$	20,100	$	17,772

Summarized statements of operations information for Double E follows (amounts represent 100% of investee financial information).

	Year Ended December 31, 2023		Year Ended December 31, 2022
	(In thousands)
Total revenues	$	42,335	$	32,418
Total operating expenses	26,868		25,685
Net income	$	15,467	$	6,733

At December 31, 2023 and 2022, the Partnership’s carrying amount of its interest in Double E approximated its underlying investment.

Ohio Gathering. The Partnership has investments in OGC and OCC that are collectively referred to as Ohio Gathering. Ohio Gathering owns, operates and is currently developing midstream infrastructure consisting of a liquids-rich natural gas gathering system, a dry natural gas gathering system and a condensate stabilization facility in the Utica Shale in southeastern Ohio. Ohio Gathering provides gathering services pursuant to primarily long-term, fee-based gathering agreements, which include acreage dedications. The Partnership made its initial investment in Ohio Gathering in 2014 and owned approximately 36.5% of OGC and approximately 38.2% of OCC at December 31, 2023 and approximately 37.2% of OGC and approximately 38.2% of OCC at December 31, 2022.

Ohio Gathering is accounted for as an equity method investment because it has joint control with non-affiliated owners, which gives the Partnership significant influence.

A reconciliation of the difference between the carrying amount of the Partnership’s interest in Ohio Gathering and the Partnership’s underlying investment in Ohio Gathering, per Ohio Gathering’s books and records, is shown below.

	2023		2022
	(In thousands)
Investment in Ohio Gathering, December 31	$	210,213	$	225,037
December cash distributions	3,950		2,673
Basis difference (1)	190,600		199,263
Investment in Ohio Gathering (Books and records), November 30,	$	404,763	$	426,973

(1) Amount consists of differences created as a result of equity method impairment charges previously recognized which are being amortized over the remaining average life of the underlying assets.

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Summarized balance sheet information for OGC and OCC follows (amounts represent 100% of investee financial information).

	November 30, 2023				November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Current assets	$	42,716	$	5,885	$	36,062	$	5,195
Noncurrent assets	1,131,503		1,104		1,157,530		274
Total assets	$	1,174,219	$	6,989	$	1,193,592	$	5,469
Current liabilities	$	6,174	$	3,736	$	6,942	$	3,588
Noncurrent liabilities	14,088		1,149		13,380		3,096
Total liabilities	$	20,262	$	4,885	$	20,322	$	6,684

Summarized statements of operations information for OGC and OCC follows (amounts represent 100% of investee financial information).

	Twelve Months Ended November 30, 2023				Twelve Months Ended November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Total revenues	$	138,707	$	15,603	$	113,317	$	13,340
Total operating expenses	99,770		12,285		106,369		12,786
Net income	38,937		3,318		6,948		554

8. DEFERRED REVENUE

The balances in deferred revenue as of December 31, 2023 and 2022 are primarily related to contributions in aid of construction which will be recognized as revenue over the life of the contract. An update of current deferred revenue is as follows.

	(In thousands)
Current deferred revenue, January 1, 2023	$	9,054
Additions	10,970
Less: revenue recognized and other	(9,828)
Current deferred revenue, December 31, 2023	$	10,196

An update of noncurrent deferred revenue follows.

	(In thousands)
Noncurrent deferred revenue, January 1, 2023	$	37,694
Additions	2,951
Less: reclassification to current deferred revenue and other	(10,560)
Noncurrent deferred revenue, December 31, 2023	$	30,085

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9. DEBT

Debt for the Partnership at December 31, 2023 and 2022 follows.

	December 31, 2023		December 31, 2022
	(In thousands)
ABL Facility: Summit Holdings’ asset based credit facility due May 1, 2026	$	313,000	$	330,000
Permian Transmission Term Loan: Permian Transmission’ variable rate senior secured term loan due January 2028	144,846		155,353
2026 Unsecured Notes: 12.00% senior unsecured notes due October 15, 2026	209,510		—
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025	49,783		259,463
2026 Secured Notes: 8.50% senior second lien notes due October 15, 2026	785,000		785,000
Less: unamortized debt discount and debt issuance costs	(31,449)		(39,454)
Total debt, net of unamortized debt discount and debt issuance costs	1,470,690		1,490,362
Less: current portion of Permian Transmission Term Loan	(15,524)		(10,507)
Total long-term debt	$	1,455,166	$	1,479,855

The aggregate amount of Partnership’s debt maturing during each of the years after December 31, 2023 are as follows (in thousands):

2024	$	15,524
2025	66,363
2026	1,324,477
2027	17,769
2028	78,006
Thereafter	—
Total debt	$	1,502,139

ABL Facility. On November 2, 2021, the Partnership, the Partnership’s subsidiary, Summit Holdings, and the subsidiaries of

Summit Holdings party thereto entered into a first-lien, senior secured credit facility, consisting of a $400.0 million asset-based revolving credit facility (the “ABL Facility”), subject to a borrowing base comprised of a percentage of eligible accounts receivable of Summit Holdings and its subsidiaries that guarantee the ABL Facility (collectively, the “ABL Facility Subsidiary Guarantors”) and a percentage of eligible above-ground fixed assets including eligible compression units, processing plants, compression stations and related equipment of Summit Holdings and the ABL Facility Subsidiary Guarantors. As of December 31, 2023, the most recent borrowing base determination of eligible assets totaled $723.2 million, an amount greater than the $400.0 million of aggregate lending commitments.

As of December 31, 2023, the applicable margin under the adjusted term SOFR borrowings was 3.25%, the interest rate was 8.71% and the unused portion of the ABL Facility totaled $82.7 million after giving effect to the issuance of $4.3 million in outstanding but undrawn irrevocable standby letters of credit.

On November 16, 2023, the Partnership amended the ABL Facility to, among other things, permit the 2023 Exchange Transactions, address springing borrowing base reserves in relation to the outstanding principal amount of the 2025 Senior Notes and amend the Interest Coverage Ratio (as defined in the ABL Agreement) covenant to 1.75x through the end of 2024 and 1.90x thereafter.

Summit Holdings entered into that certain Loan and Security Agreement governing the ABL Facility (the “ABL Agreement”), dated as of November 2, 2021, by and among Summit Holdings, as borrower, the Partnership, the ABL Facility Subsidiary Guarantors, Bank of America, N.A., as agent, ING Capital LLC, Royal Bank of Canada and Regions Bank, as co-syndication agents, and Bank of America, N.A., ING Capital LLC, RBC Capital Markets and Regions Capital Markets, as joint lead arrangers and joint bookrunners.

The ABL Facility will mature on May 1, 2026; provided that if the outstanding amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date (as defined in the ABL Agreement)) on such date equals or exceeds $50.0 million, then the ABL Facility will mature on December 13, 2024. As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

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The ABL Facility (together with certain Secured Bank Product Obligations (as defined in the ABL Agreement)) will be jointly and severally guaranteed, on a senior first-priority secured basis (subject to permitted liens), by the Partnership, Summit Holdings and each of the ABL Facility Subsidiary Guarantors.

The ABL Facility restricts, among other things, Summit Holdings’ and its Restricted Subsidiaries’ (as defined in the ABL Agreement) ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions or repurchase equity; (iii) make payments on or redeem junior lien, unsecured or subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications.

The ABL Facility requires that Summit Holdings not permit (i) the First Lien Net Leverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be greater than 2.50:1.00, or (ii) the Interest Coverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be less than 1.75:1.00 through the end of 2024 or less than 1.90:1.00 thereafter. As of December 31, 2023, the First Lien Net Leverage Ratio was 1.22:1.00 and the Interest Coverage Ratio was 1.93:1.00 and the Partnership was in compliance with the financial covenants of the ABL Facility.

The ABL Facility contains certain events of default customary for instruments of this type. In the case of an event of default arising from certain events of bankruptcy, insolvency or reorganization with respect to Summit Holdings, all outstanding Obligations (as defined in the ABL Agreement) will become due and payable immediately without further action or notice and all commitments under the ABL Facility will terminate.

Pursuant to the ABL Agreement, the Obligations (as defined in the ABL Agreement) are (or, subject to post-closing periods for certain types of collateral, will be) generally secured by a first priority lien on and security interest in (subject to permitted liens), subject to certain exclusions and limitations set forth in the ABL Agreement, (i) substantially all of the personal property of Summit Holdings and the ABL Facility Subsidiary Guarantors, (ii) all equity interests in Summit Holdings and certain other entities, all debt securities and certain rights related to the foregoing, in each case, owned by the Partnership, (iii) Closing Date Material Gathering Station Real Property and Closing Date Pipeline Material Gathering Station Real Property (each, as defined in the ABL Agreement) and certain other material real property interests (including improvements thereon) of Summit Holdings and the ABL Facility Subsidiary Guarantors as provided in the ABL Agreement and (iv) all proceeds of the foregoing collateral.

Intercreditor Agreement.

On November 2, 2021, in connection with the entry into the ABL Facility and issuance of the 2026 Secured Notes, Summit Holdings and the other guarantors party thereto entered into an Intercreditor Agreement (the “Intercreditor Agreement”) with Bank of America, N.A., as first lien representative and collateral agent for the initial first lien claimholders, Regions Bank, as second lien representative for the initial second lien claimholders and collateral agent for the initial second lien claimholders, establishing (i) a first-priority lien (subject to permitted liens) status for the liens on the collateral securing the ABL Facility and any additional first-lien indebtedness and (ii) a junior priority lien (subject to permitted liens) status for the liens on the collateral securing the 2026 Secured Notes and any additional second-lien indebtedness.

Permian Transmission Credit Facilities. On March 8, 2021 (the “Permian Closing Date”), the Partnership’s unrestricted subsidiary, Permian Transmission, entered into a Credit Agreement which allows for $175.0 million of senior secured credit facilities, including a $160.0 million Term Loan Facility and a $15.0 million Working Capital Facility. The Permian Transmission Credit Facilities can be used to finance Permian Transmission’s capital calls associated with its investment in Double E, debt service and other general corporate purposes. Unexpended proceeds from draws on the Permian Transmission Credit Facilities are classified as restricted cash on the accompanying unaudited condensed consolidated balance sheets.

On June 27, 2023, we amended the Permian Transmission Credit Facilities to, among other things, transition the LIBOR based interest rates under the Permian Transmission Credit Facilities to term SOFR.

As of December 31, 2023, the applicable margin under adjusted term SOFR borrowings was 2.475%, the interest rate was 7.79% and the unused portion of the Permian Transmission Credit Facilities totaled $4.5 million, subject to a commitment fee of 0.7% after giving effect to the issuance of $10.5 million in outstanding but undrawn irrevocable standby letters of credit. Summit Permian Transmission, LLC entered into interest rate hedges with notional amounts representing approximately 90% of the Permian Term Loan facility at a fixed SOFR rate of 1.23%. As of December 31, 2023, the Partnership was in compliance with the financial covenants of the Permian Transmission Credit Facilities.

Permian Transmission Term Loan. As described above, in January 2022, the Permian Term Loan Facility was converted into a Term Loan (the “Permian Transmission Term Loan”). The Permian Transmission Term Loan is due January 2028. As of December 31, 2023, the applicable margin under adjusted term SOFR borrowings was 2.475% and the interest rate was 7.79%. As of December 31, 2023, the Partnership was in compliance with the financial covenants governing the Permian Transmission Term Loan.

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In accordance with the terms of the Permian Transmission Term Loan, Permian Transmission is required to make mandatory principal repayments. Below is a summary of the remaining mandatory principal repayments as of December 31, 2023:

(In thousands)	Total		2024		2025		2026		2027		2028
Amortizing principal repayments	$	144,846	$	15,524	$	16,580	$	16,967	$	17,769	$	78,006

2026 Secured Notes. In 2021, the Co-Issuers issued $700.0 million of 8.500% Senior Secured Second Lien Notes due 2026 (the “2026 Secured Notes”) to eligible purchasers pursuant to Rule 144A and Regulation S of the Securities Act, at a price of 98.5% of their face value. Additionally, in November 2022, in connection with the 2022 DJ Acquisitions, the Co-Issuers issued an additional $85.0 million of 2026 Secured Notes at a price of 99.26% of their face value. The 2026 Secured Notes will pay interest semi-annually on April 15 and October 15 of each year, commencing on April 15, 2022, and are jointly and severally guaranteed, on a senior second-priority secured basis (subject to permitted liens), by the Partnership and each restricted subsidiary of the Partnership (other than the Co-Issuers) that is an obligor under the ABL Agreement, or under the Co-Issuers’ 2025 Senior Notes on the issue date of the 2026 Secured Notes.

The 2026 Secured Notes will mature on October 15, 2026; provided that, if the outstanding amount of the 2025 Senior Notes (or any refinancing indebtedness in respect thereof that has a final maturity on or prior to the date that is 91 days after the Initial Maturity Date (as defined in the 2026 Secured Notes Indenture)) is greater than or equal to $50.0 million on January 14, 2025, which is 91 days prior to the scheduled maturity date of the 2025 Senior Notes, then the 2026 Secured Notes will mature on January 14, 2025.

The Partnership used the net proceeds from the offering of the 2026 Secured Notes, together with cash on hand and borrowings under the ABL Facility, to repay in full all of Summit Holdings’ obligations under the Revolving Credit Facility.

2026 Secured Notes Indenture.

The Co-Issuers issued the 2026 Secured Notes pursuant to an indenture (the “2026 Secured Notes Indenture”), dated as of November 2, 2021, by and among the Co-Issuers, the Partnership, any other Restricted Subsidiary (as defined in the 2026 Secured Notes Indenture) of the Partnership that provides a Notes Guarantee (as defined in the 2026 Secured Notes Indenture) and Regions Bank, as trustee (the “2026 Secured Notes Trustee”) and collateral agent, setting forth specific terms applicable to the 2026 Secured Notes.

At any time prior to October 15, 2023, the Co-Issuers could have on any one or more occasions redeemed up to 35% of the aggregate principal amount of the 2026 Secured Notes (including any additional notes) issued under the 2026 Secured Notes Indenture at a redemption price of 108.5% of the principal amount of the 2026 Secured Notes, plus accrued and unpaid interest, if any, to, but not including, the redemption date, in an amount not greater than the net cash proceeds of certain equity offerings by the Partnership, provided that: (i) at least 65% of the initial aggregate principal amount of the 2026 Secured Notes (including any additional notes) remains outstanding immediately after the occurrence of such redemption (excluding notes held by the Partnership and its subsidiaries); and (ii) the redemption occurs within 180 days of the date of the closing of each such equity offering by the Partnership. On and after October 15, 2023, the Co-Issuers may redeem all or part of the 2026 Secured Notes at redemption prices (expressed as percentages of principal amount) equal to: (a) 104.250% for the twelve-month period beginning October 15, 2023; (b) 102.125% for the twelve-month period beginning October 15, 2024; and (c) 100.000% for the twelve-month period beginning on October 15, 2025 and at any time thereafter, in each case plus accrued and unpaid interest, if any, to, but not including, the redemption date. In certain circumstances, the Co-Issuers will be required to offer to purchase the 2026 Secured Notes with excess proceeds from asset sales, excess cash flow and upon the occurrence of certain change of control events.

The 2026 Secured Notes Indenture restricts the Partnership’s and its Restricted Subsidiaries’ ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions, repurchase equity or redeem junior lien, unsecured or subordinated debt; (iii) make payments on junior lien, unsecured or subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications. At any time when the 2026 Secured Notes are rated investment grade by at least two of Moody’s Investors Service, Inc., Standard & Poor’s Ratings Services or Fitch Ratings, Inc., many of these covenants will terminate. As of December 31, 2023, the Partnership was in compliance with the financial covenants of the 2026 Secured Notes.

The 2026 Secured Notes Indenture contains certain events of default customary for instruments of this type.

In the case of an event of default arising from certain events of bankruptcy, insolvency or reorganization with respect to either Co-Issuer, the Partnership, and certain significant subsidiaries of the Partnership, all outstanding Notes will become due and payable immediately without further action or notice. If any other event of default occurs and is continuing, the 2026 Secured Notes Trustee or the holders of at least 25% in principal amount of the then outstanding Notes may declare all the 2026 Secured Notes to be due and payable immediately.

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Collateral Agreement.

On November 2, 2021, the Co-Issuers, as pledgors and grantors, entered into, in connection with the 2026 Secured Notes Indenture, a Collateral Agreement (Second Lien), with the Partnership, as a pledgor, each subsidiary guarantor listed therein and Regions Bank, as collateral agent (the “Collateral Agreement”). Pursuant to the Collateral Agreement and the 2026 Secured Notes Indenture, the obligations under the 2026 Secured Notes Indenture are (or, subject to post-closing periods for certain types of collateral, will be) generally secured by a second priority lien on and security interest in (subject to permitted liens) the assets of the Partnership, the Co-Issuers and the subsidiary guarantors securing their obligations under the ABL Facility (as described above under “ABL Facility”).

Excess Cash Flow Offers to Purchase.

Starting in the first quarter of 2023 with respect to the fiscal year ended 2022, and continuing annually through the fiscal year 2025, the Partnership is required under the terms of the 2026 Secured Notes Indenture to, if it has Excess Cash Flow (as defined in the 2026 Secured Notes Indenture), and subject to its ability to make such an offer under the ABL Facility, offer to purchase an amount of the 2026 Secured Notes, at 100% of the principal amount plus accrued and unpaid interest, equal to 100% of the Excess Cash Flow generated in the prior year. Excess Cash Flow is generally defined as consolidated cash flow minus the sum of capital expenditures and cash payments in respect of permitted investments and permitted restricted payments.

Generally, if the Partnership does not offer to purchase designated annual amounts of its 2026 Secured Notes or reduce its first lien capacity under the 2026 Secured Notes Indenture per annum from 2023 through 2025, the interest rate on the 2026 Secured Notes is subject to certain rate escalations. Per the terms of the 2026 Secured Notes Indenture, the designated amounts are to offer to purchase $50.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2023, otherwise the interest rate shall automatically increase by 50 basis points per annum; $100.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2024, otherwise the interest rate shall automatically increase by 100 basis points per annum (minus any amount previously increased); and $200.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2025, otherwise the interest rate shall automatically increase by 200 basis points per annum (minus any amount previously increased). The Partnership does not anticipate making offers to purchase in the designated amount for the fiscal year ended 2023, and, as a result, the interest rate on the 2026 Secured Notes will increase an incremental 50 basis points to 9.50% effective April 1, 2024, resulting in an incremental increase in annual interest expense of approximately $3.9 million.

To the extent the Partnership makes an offer to purchase, and the offer is not fully accepted by the holders of the 2026 Secured Notes, the Partnership may use any remaining amount not accepted for any purpose not prohibited by the 2026 Secured Notes Indenture or the ABL Facility.

2026 Unsecured Notes. In November 2023, the Co-Issuers issued a total of $209.5 million aggregate principal amount of 2026 Unsecured Notes in exchange for $180.0 million aggregate principal amount of the 2025 Senior Notes and $29.5 million in cash. The cash raised was used to repurchase $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. The Partnership pays interest on the 2026 Unsecured Notes semi-annually in cash in arrears on April 15 and October 15 of each year. The 2026 Unsecured Notes are senior, unsecured obligations and rank equally in right of payment with all of the Partnership’s existing and future senior obligations. The 2026 Unsecured Notes are effectively subordinated in right of payment to all of the Partnership’s secured indebtedness, to the extent of the collateral securing such indebtedness.

The Co-Issuers have the right to redeem all or part of the 2026 Unsecured Notes at a redemption price of (a) on or before April 15, 2025, 101.000%, and (b) after April 15, 2025, 102.000%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As December 31, 2023, the Partnership was in compliance with the financial covenants of the 2026 Unsecured Notes. The 2026 Unsecured Notes will mature on October 15, 2026.

2026 Unsecured Notes Indenture.

The Co-Issuers issued the 2026 Secured Notes pursuant to an indenture (the “2026 Unsecured Notes Indenture”), dated as of November 21, 2023, by and among the Co-Issuers, the guarantors party thereto and Regions Bank, as trustee (the “2026 Unsecured Notes Trustee”), setting forth specific terms applicable to the 2026 Unsecured Notes.

The indenture governing the 2026 Unsecured Notes restricts the Partnership’s and the Co-Issuers’ ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions, repurchase equity or redeem subordinated debt; (iii) make payments on subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) sell or otherwise dispose of a portion of their assets; (vii) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications. At any time when the 2026 Unsecured Notes are rated investment grade by Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Services and no Default or Event of Default (each as defined in the indenture governing the 2026 Unsecured Notes) has occurred and is continuing, many of these covenants will terminate.

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The indenture governing the 2026 Unsecured Notes provides that each of the following is an Event of Default: (i) default for 30 days in the payment when due of interest on the 2026 Unsecured Notes; (ii) default in payment when due of the principal of, or premium, if any, on the 2026 Unsecured Notes; (iii) failure by the Co-Issuers or the Partnership to comply with certain covenants relating to merger, consolidation, sale of assets, change of control or asset sales; (iv) failure by the Partnership for 180 days after notice to comply with certain covenants relating to the filing of annual, quarterly and current reports with the SEC; (v) failure by the Co-Issuers or the Partnership for 30 days after notice to comply with any of the other agreements in the indenture governing the 2026 Unsecured Notes; (vi) default under any mortgage, indenture or instrument under which there may be issued or by which there may be secured or evidenced any indebtedness for money borrowed by the Partnership or any of its restricted subsidiaries (or the payment of which is guaranteed by the Partnership or any of its restricted subsidiaries) if that default: (a) is caused by a failure to pay principal of, or interest or premium, if any, on such indebtedness prior to the expiration of the grace period provided in such indebtedness (a “Payment Default”); or (b) results in the acceleration of such indebtedness prior to its stated maturity, and, in each case, the principal amount of any such indebtedness, together with the principal amount of any other such indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated, aggregates $75.0 million or more; (vii) failure by the Partnership or any of its restricted subsidiaries to pay final judgments aggregating in excess of $75.0 million, which judgments are not paid, discharged or stayed for a period of 60 days; (viii) except as permitted by the indenture governing the 2026 Unsecured Notes, any guarantee shall be held in any judicial proceeding to be unenforceable or invalid or shall cease for any reason to be in full force and effect or any Guarantor, or any person acting on behalf of any Guarantor, shall deny or disaffirm its obligations under its guarantee of the 2026 Unsecured Notes; and (ix) certain events of bankruptcy, insolvency or reorganization described in the indenture governing the 2026 Unsecured Notes with respect to the Co-Issuers, the Partnership or any of the Partnership’s restricted subsidiaries that is a significant subsidiary or any group of the Partnership’s restricted subsidiaries that, taken as a whole, would constitute a significant subsidiary of the Partnership.

In the case of an Event of Default arising from certain events of bankruptcy, insolvency or reorganization with respect to either Co-Issuer, the Partnership, any of the Partnership’s restricted subsidiaries that is a significant subsidiary or any group of the Partnership’s restricted subsidiaries that, taken as a whole, would constitute a significant subsidiary, all outstanding 2026 Unsecured Notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the 2026 Unsecured Notes Trustee or the holders of at least 25% in principal amount of the then outstanding 2026 Unsecured Notes may declare all the 2026 Unsecured Notes to be due and payable immediately.

2025 Senior Notes. In February 2017, the Co-Issuers co-issued the 2025 Senior Notes. The Partnership pays interest on the 2025 Senior Notes semi-annually in cash in arrears on April 15 and October 15 of each year. The 2025 Senior Notes are senior, unsecured obligations and rank equally in right of payment with all of the Partnership’s existing and future senior obligations. The 2025 Senior Notes are effectively subordinated in right of payment to all of the Partnership’s secured indebtedness, to the extent of the collateral securing such indebtedness.

The Co-Issuers have the right to redeem all or part of the 2025 Senior Notes at a redemption price of 100.00%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As discussed above, in November, 2023, the Partnership exchanged $180.0 million aggregate principal amount of the 2025 Senior Notes and repurchased $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

As of December 31, 2023, the Partnership was in compliance with the financial covenants of the 2025 Senior Notes. The 2025 Senior Notes will mature on April 15, 2025.

10. COMMITMENTS AND CONTINGENCIES

Environmental Matters. Although the Partnership believes that it is in material compliance with applicable environmental regulations, the risk of environmental remediation costs and liabilities are inherent in pipeline ownership and operation. Furthermore, the Partnership can provide no assurances that significant environmental remediation costs and liabilities will not be incurred in the future. The Partnership is currently not aware of any material contingent liabilities that exist with respect to environmental matters, except as noted below.

As of December 31, 2023, the Partnership has recognized (i) a current liability for remediation effort expenditures expected to be incurred within the next 12 months and (ii) a noncurrent liability for estimated remediation expenditures expected to be incurred subsequent to December 31, 2024. Each of these amounts represent the Partnership’s best estimate for costs expected to be incurred. Neither of these amounts have been discounted to their present value.

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An update of the Partnership’s undiscounted accrued environmental remediation is as follows and is primarily related to the 2015 Blacktail Release and other environmental remediation activities, as described below.

	(In thousands)
Accrued environmental remediation, December 31, 2021	$	5,606
Payments made	(2,746)
Additional accruals	845
Accrued environmental remediation, December 31, 2022	$	3,705
Payments made	(641)
Changes in estimates	(127)
Accrued environmental remediation, December 31, 2023	$	2,937

In 2015, the Partnership learned of the rupture of a four-inch produced water gathering pipeline on the Meadowlark Midstream system near Williston, North Dakota (“2015 Blacktail Release”). On August 4, 2021, subsidiaries of the Partnership entered into the following agreements to resolve the U.S. federal and North Dakota state governments’ environmental claims with respect to the 2015 Blacktail Release: (i) a Consent Decree with the U.S. Department of Justice (“DOJ”), the U.S. Environmental Protection Agency (“EPA”), and the State of North Dakota (“Consent Decree”); (ii) a Plea Agreement with the United States (“Plea Agreement”); and (iii) a Consent Agreement with the North Dakota Industrial Commission (“Consent Agreement” together with the Consent Decree and Plea Agreement, the “Global Settlement”). As of December 31, 2023 and 2022, the accrued loss liability for the 2015 Blacktail Release was $21.7 million and $28.3 million, respectively, and are recorded within Other noncurrent liabilities and Accrued settlements payable within the consolidated balance sheets.

Key terms of the Global Settlement included (i) payment of penalties and fines totaling $36.3 million, consisting of $1.25 million in natural resource damages payable to federal and state governments, a $25.0 million payable to the federal government over five years, and a $10.0 million payable to state governments over, for the federal and state civil amounts six years, and, for the federal criminal amounts, five years, with interest applied to unpaid amounts accruing at, for the federal and state civil amounts, a fixed rate of 3.25%, and, for the federal criminal amounts, a variable rate set by statute, and of which $6.7 million is expected to be paid within the next twelve months; (ii) continuation of remediation efforts at the site of the 2015 Blacktail Release; (iii) other injunctive relief including but not limited to control room management, environmental management system audit, training, and reporting; (iv) guilty pleas by Defendant subsidiary for (a) one charge of negligent discharge of a harmful quantity of oil and (b) one charge of knowing failure to immediately report a discharge of oil; and (v) organizational probation for a minimum period of three years from sentencing on December 6, 2021, including payment in full of certain components of the fines and penalty amounts. The agreements comprising the Global Settlement were subject to the approval of the U.S. District Court for the District of North Dakota (the “U.S. District Court”). The U.S. District Court entered an order making the civil components of the Global Settlement effective on September 28, 2021 and accepted the sentencing in the Plea Agreement on December 6, 2021, completing approval of the Global Settlement.

Subsidiaries of the Partnership are also participating in two proceedings before the EPA as a result of the Plea Agreement becoming effective. Following the U.S. District Court’s entering judgment on Defendant subsidiary’s guilty plea to one count of negligent discharge of produced water in violation of the Clean Water Act, Defendant subsidiary was statutorily debarred by operation of law pursuant to 33 U.S.C. § 1368(a) to participate in federal awards performed at the “violating facility,” which EPA determined to be the Marmon subsystem of the produced water gathering system in North Dakota. The scope and effect of the debarment as defined did not materially affect the Partnership’s operations. Defendant has submitted a petition for reinstatement, which was denied by the EPA’s suspension and debarment office (“SDO”) on July 11, 2022. The SDO determined that the term of probation in the Plea Agreement was the appropriate period of time to demonstrate Defendant subsidiary’s change of corporate attitude, policies, practices, and procedures. The Partnership and certain subsidiaries have also received a show cause notice from the EPA requesting us to “show cause” why SDO should not issue a Notice of Proposed Debarment to the Defendant subsidiary and certain affiliates under 2 C.F.R. § 180.800(d), to which we have responded, and in which proceeding no further developments have occurred.

Legal Proceedings. The Partnership is involved in various litigation and administrative proceedings arising in the ordinary course of business. In the opinion of management, any liabilities, which include insured claims, would not individually or in the aggregate have a material adverse effect on the Partnership's financial position or results of operations.

11. FINANCIAL INSTRUMENTS

Concentrations of Credit Risk. Financial instruments that potentially subject the Partnership to concentrations of credit risk consist of cash and cash equivalents, restricted cash and accounts receivable. The Partnership maintains its cash and cash

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equivalents and restricted cash in bank deposit accounts that frequently exceed federally insured limits. The Partnership has not experienced any losses in such accounts and does not believe it is exposed to any significant risk.

Accounts receivable primarily comprise amounts due for the gathering, compression, treating and processing services the Partnership provides to its customers and also the sale of natural gas liquids resulting from its processing services. This industry concentration has the potential to impact its overall exposure to credit risk, either positively or negatively, in that the Partnership’s customers may be similarly affected by changes in economic, industry or other conditions. The Partnership monitors the creditworthiness of its counterparties and can require letters of credit or other forms of credit assurance for receivables from counterparties that are judged to have substandard credit, unless the credit risk can otherwise be mitigated.

Fair Value. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable and trade accounts payable reported on the consolidated balance sheet approximates fair value due to their short-term maturities.

A summary of the estimated fair value of the Partnership’s debt financial instruments follows.

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(in thousands)
2025 Senior Notes	$	49,783	$	48,414	$	259,463	$	221,733
2026 Secured Notes	$	785,000	$	778,131	$	785,000	$	750,983
2026 Unsecured Notes	$	209,510	$	203,225	$	—	$	—

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

The carrying value on the balance sheets of the ABL Facility and Permian Transmission Term Loan represent their fair value due to its floating interest rate. The fair value for the 2026 Unsecured Notes, 2026 Secured Notes and 2025 Senior Notes is based on an average of nonbinding broker quotes as of December 31, 2023 and 2022. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value of the Senior Notes.

Deferred earn-out. As a result of the acquisition of Sterling DJ, the Partnership assumed a deferred earn-out liability, which is remeasured each reporting period. As of December 31, 2023 and 2022, the estimated fair value of the deferred earn-out liability was $5.1 million and $5.2 million and was estimated using a discounted cash flow technique based on estimated future fresh water deliveries and appropriate discount rates, and the balances are recorded within other noncurrent liabilities on the consolidated balance sheets. Given the unobservable nature of the inputs, the fair value measurement of the deferred earn-out is deemed to use Level 3 inputs. The deferred earn-out sits within Centennial Water Pipelines LLC, one of the Partnership’s unrestricted subsidiaries.

Interest Rate Swaps. In connection with the Permian Transmission Term Loan, formerly the Permian Transmission Credit Facilities, the Partnership entered into amortizing interest rate swap agreements. As of December 31, 2023 and 2022, the outstanding notional amount of interest rate swaps was $130.4 million and $139.8 million, respectively. These interest rate swaps manage exposure to variability in expected cash flows attributable to interest rate risk. Interest rate swaps convert a portion of the Partnership’s variable rate debt to fixed rate debt. The Partnership chooses counterparties for its derivative instruments that it believes are creditworthy at the time the transactions are entered into, and the Partnership actively monitors the creditworthiness where applicable. However, there can be no assurance that a counterparty will be able to meet its obligations to the Partnership. The Partnership presents its derivative positions on a gross basis and does not net the asset and liability positions. During 2023, the Partnership amended its interest rate swap agreements to, among other things, replace its LIBOR based terms with a SOFR rate terms.

As of December 31, 2023 and 2022, the Partnership’s interest rate swap agreements had a fair value of $11.9 million and $15.2 million, respectively, and are recorded within other noncurrent assets within the consolidated balance sheets. The derivative instruments’ fair value are determined using level 2 inputs from the fair value hierarchy.

12. PARTNERS' CAPITAL AND MEZZANINE CAPITAL

Common Units. An update on the number of common units is as follows for the period from December 31, 2021 to December 31, 2023.

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	Common Units
December 31, 2021	7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes	2,853,875
Common units issued for SMLP LTIP, net	159,054
December 31, 2022	10,182,763
Common units issued for SMLP LTIP, net	193,426
December 31, 2023	10,376,189

Series A Preferred Units. In November 2017, the Partnership issued 300,000 Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series A Preferred Units”) representing limited partner interests in the Partnership at a price to the public of $1,000 per unit. 

The Series A Preferred Units rank senior to (i) common units representing limited partner interests in the Partnership and (ii) each other class or series of limited partner interests or other equity securities in the Partnership that may be established in the future that expressly ranks junior to the Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. The Series A Preferred Units rank equal in all respects with each class or series of limited partner interests or other equity securities in the Partnership that may be established in the future that is not expressly made senior or subordinated to the Series A Preferred Units as to the payment of distributions and amounts payable on a liquidation event. The Series A Preferred Units rank junior to (i) all of the Partnership’s existing and future indebtedness and other liabilities with respect to assets available to satisfy claims against the Partnership and (ii) each other class or series of limited partner interests or other equity securities in the Partnership established in the future that is expressly made senior to the Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. Income is allocated to the Series A Preferred Units in an amount equal to the earned distributions (whether these distributions are declared by the General Partner to be paid or not) for the respective reporting period.

Distributions on the Series A Preferred Units are cumulative and compounding and are payable semi-annually in arrears on the 15th day of each June and December through and including December 15, 2022, and, thereafter, quarterly in arrears on the 15th day of March, June, September and December of each year (each, a “Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Distribution Payment Date, in each case, when, as, and if declared by the General Partner out of legally available funds for such purpose.

The initial distribution rate for the Series A Preferred Units is 9.50% per annum of the $1,000 liquidation preference per Series A Preferred Unit. On and after December 15, 2022, distributions on the Series A Preferred Units will accumulate for each distribution period at a percentage of the liquidation preference equal to the three-month LIBOR plus a spread of 7.43%. During the fourth quarter of 2023, distributions on the Series A Preferred Units began to accumulate at a rate equal to the three-month SOFR plus a spread of 7.69%. The floating rate established on December 15, 2023 for the period ending March 31, 2024 was 13.1%.

The Partnership suspended its distributions to be paid to holders of its Series A Preferred Units, commencing with respect to the quarter ending March 31, 2020. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units was $33.0 million.

A rollforward of the number of outstanding Series A Preferred Units follows for the period from December 31, 2021 to December 31, 2023.

	Series A Preferred Units
December 31, 2021	143,447
2022 Preferred Exchange Offer	(77,939)
December 31, 2022	65,508
2023 activity	—
December 31, 2023	65,508

2022 Preferred Exchange Offer. In January 2022, the Partnership completed an offer to exchange its Series A Preferred Units for newly issued common units (the “2022 Preferred Exchange Offer”), whereby it issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units. Upon the settlement of the 2022 Preferred Exchange Offer, the Partnership eliminated $92.6 million of the Series A Preferred Unit liquidation preference amount, inclusive of accrued distributions due as of the settlement date.

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Subsidiary Series A Preferred Units. The Partnership has Subsidiary Series A Preferred Units that ranks senior to each other class or series of limited partner interests or other equity securities in Permian Holdco that may be established in the future that expressly ranks junior to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. The Subsidiary Series A Preferred Units rank equal in all respects with each class or series of limited partner interests or other equity securities in Permian Holdco that may be established in the future that is not expressly made senior or subordinated to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable on a liquidation event. The Subsidiary Series A Preferred Units rank junior to (i) all of Permian Holdco’s or a subsidiary of Permian Holdco’s future indebtedness and other liabilities with respect to assets available to satisfy claims against Permian Holdco and (ii) each other class or series of limited partner interests or other equity securities in Permian Holdco established in the future that is expressly made senior to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. Income is allocated to the Subsidiary Series A Preferred Units in an amount equal to the earned distributions for the respective reporting period.

Distributions on the Subsidiary Series A Preferred Units are cumulative and compounding and are payable 21 days following the quarterly period ended March, June, September and December of each year (each, a “Series A Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Series A Distribution Payment Date, in each case, when, as, and if declared by Permian Holdco out of legally available funds for such purpose.

The distribution rate for the Subsidiary Series A Preferred Units is 7.00% per annum of the $1,000 liquidation preference per Subsidiary Series A Preferred Unit. A pro-rated initial distribution on the Subsidiary Series A Preferred Units was Paid-in-kind (“PIK”) on January 21, 2020 in an amount equal to 7.00% per Subsidiary Series A Preferred Unit plus 1.00% per annum of the undrawn commitment units.

These Subsidiary Series A Preferred Units are considered redeemable securities under GAAP due to the existence of certain redemption provisions that are outside of the Partnership’s control. Therefore, the securities are classified as temporary equity in the mezzanine section of the consolidated balance sheets.

The Partnership records its Subsidiary Series A Preferred Units at fair value upon issuance, net of issuance costs, and subsequently records an effective interest method accretion amount each reporting period to accrete the carrying value to a most probable redemption value that is based on a predetermined internal rate of return measure. The Partnership also elected to make PIK distributions to holders of the Subsidiary Series A Preferred Units during portions of the year ended December 31, 2022, which increase the liquidation preference on each Subsidiary Series A Preferred Unit. Ultimately, Net Income (Loss) Attributable to common limited partners includes adjustments for PIK distributions and redemption accretion. During the year ended December 31, 2022, the Partnership issued 1,600 Subsidiary Series A Preferred Units, through PIK transactions. The Partnership did not make any PIK distributions during the year ended December 31, 2023. As of December 31, 2023 and 2022, the Partnership had 93,039 Subsidiary Series A Preferred Units outstanding.

If the Subsidiary Series A Preferred Units were redeemed on December 31, 2023, the redemption amount would be $125.5 million, when considering the applicable multiple of invested capital metric and make-whole amount provisions contained in the Amended and Restated Limited Liability Company Agreement of Permian Holdco. 

The following table shows the change in the Partnership’s Subsidiary Series A Preferred Unit balance from January 1, 2022 through December 31, 2023, net of $1.7 million and $2.2 million of unamortized issuance costs at December 31, 2023 and December 31, 2022, respectively:

	(in thousands)
Balance at January 1, 2022	$	106,325
PIK distributions	1,600
Redemption accretion, net of issuance cost amortization	15,544
Cash distribution (includes $1.6 million distributions payable as of December 31, 2022)	(4,885)
Balance at December 31, 2022	$	118,584
Redemption accretion, net of issuance cost amortization	12,581
Cash distribution (includes $1.6 million distributions payable as of December 31, 2023)	(6,513)
Balance at December 31, 2023	$	124,652

Cash Distribution Policy. The Partnership suspended its cash distributions to holders of its common units and Series A Preferred Units, commencing with respect to the quarter ending March 31, 2020. Upon the resumption of distributions, the Partnership Agreement requires that it distribute all available cash, subject to reserves established by its General Partner, within 45 days after the end of each quarter to unitholders of record on the applicable record date. The amount of distributions paid under this policy is subject to fluctuations based on the amount of cash the Partnership generates from its business and the

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decision to make any distribution is determined by the General Partner, taking into consideration the terms of the Partnership Agreement.

13. EARNINGS PER UNIT

The following table details the components of EPU.

	Year ended December 31,
	2023		2022
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net loss	$	(38,947)	$	(123,461)
Less: Net income attributable to Subsidiary Series A Preferred Units	(12,581)		(17,144)
Net loss attributable Summit Midstream Partners, LP	(51,528)		(140,605)
Less: Net income attributable to Series A Preferred Unit	(11,566)		(8,048)
Add: Deemed capital contribution	—		20,974
Net loss attributable to common limited partners	$	(63,094)	$	(127,679)
Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	10,334		10,048
Effect of nonvested phantom units	—		—
Weighted-average common units outstanding – diluted	10,334		10,048
Net Loss per limited partner unit:
Common unit – basic	$	(6.11)	$	(12.71)
Common unit – diluted	$	(6.11)	$	(12.71)
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	245		177

14. SUPPLEMENTAL CASH FLOW INFORMATION

	Year ended December 31,
	2023		2022
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	127,022	$	89,472
Cash paid for taxes	15		149
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	11,612	$	6,724
2025 Senior Notes Exchange	180,030		—
Accretion of Subsidiary Series A Preferred Units	12,581		15,544
Right-of-use assets acquired in connection with Sterling DJ acquisition	—		9,865
2022 Preferred Exchange Offer	—		92,587

15. UNIT-BASED AND NONCASH COMPENSATION

SMLP Long-Term Incentive Plan. The Partnership’s Long-Term Incentive Plan (“SMLP LTIP”) provides for equity awards to eligible officers, employees, consultants and directors of the Partnership, thereby linking the recipients' compensation directly to SMLP’s performance. The SMLP 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

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Committee. Initially, a total of 1.0 million common units was reserved for issuance pursuant to and in accordance with the SMLP LTIP. On June 24, 2022 unitholders of the Partnership approved the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, which increased the number of common units available for issuance to the Partnership’s employees, consultants and directors. As of December 31, 2023, approximately 0.5 million common units remained available for future issuance under the SMLP LTIP, which includes the impact of 0.7 million granted but unvested phantom units.

Significant items for the year ended December 31, 2023:

•For the year ended December 31, 2023, the Partnership granted 212,893 phantom units and associated distribution equivalent rights to employees. These awards granted during the year ended December 31, 2023 had a fair values of $16.00 per common unit and vest ratably over a three-year period.

•For the year ended December 31, 2023, the Partnership granted 110,478 performance-based phantom units and associated distribution equivalent rights to certain members of management in connection with the Partnership’s annual incentive compensation award cycle. The grant date fair value of these awards total $2.2 million.

•For the year ended December 31, 2023, the Partnership issued 38,100 common units to the Partnership’s six independent directors in connection with their annual compensation plan. These awards had a grant date fair value of $16.00 per common unit and vested immediately.

The following table presents phantom unit activity for the periods presented:

	Units	Weighted-average grant date fair value
Nonvested phantom units, December 31, 2021	333,779	$	21.78
Phantom units granted	509,631	17.70
Phantom units vested	(229,551)	23.61
Phantom units forfeited	(8,717)	22.53
Nonvested phantom units, December 31, 2022	605,142	17.62
Phantom units granted	323,371	17.29
Phantom units vested	(236,154)	15.69
Phantom units forfeited	(3,892)	20.50
Nonvested phantom units, December 31, 2023	688,467	$	17.69

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.

Phantom units granted to date generally vest ratably over a three-year period. Grant date fair value is determined based on the closing price of SMLP’s common units on the date of grant multiplied by the number of phantom units awarded to the grantee. Forfeitures are recorded as incurred. Holders of all phantom units granted to date are entitled to receive distribution equivalent rights for each phantom unit, providing for a lump sum cash amount equal to the accrued distributions from the grant date of the phantom units to be paid in cash upon the vesting date. Upon vesting, phantom unit awards may be settled, at the Partnership’s discretion, in cash and/or common units, but the current intention is to settle all phantom unit awards with common units.

The intrinsic value of phantom units that vested during the years ended December 31, follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Intrinsic value of vested LTIP awards	$	3,758	$	5,420

As of December 31, 2023, the unrecognized unit-based compensation related to the SMLP LTIP was $5.9 million. Incremental unit-based compensation will be recorded over the remaining weighted-average vesting period of approximately 0.98 years.

Unit-based compensation recognized in general and administrative expense related to awards under the SMLP LTIP follows.

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	Year ended December 31,
	2023		2022
	(In thousands)
SMLP LTIP unit-based compensation	$	6,566	$	3,778

16. LEASES

Leases. The Partnership leases certain office space and equipment under operating leases. The Partnership leases office space for terms of between 3 and 10 years. Office space leases limit exposure to risks related to ownership, such as fluctuations in real estate prices. The Partnership leases equipment primarily to support its operations in response to the needs of its gathering systems for terms of between 3 and 4 years. The Partnership also leases vehicles under finance leases to support its operations in response to the needs of its gathering systems for a term of 3 years.

Some of the Partnership’s leases are subject to annual escalations relating to the Consumer Price Index (“CPI”). While lease liabilities are not remeasured as a result of changes to the CPI, changes to the CPI are treated as variable lease payments and recognized in the period in which the obligation for those payments was incurred.

Significant assumptions or judgments include the determination of whether a contract contains a lease and the discount rate used in the lease liabilities.

The rate implicit in the lease contracts are not readily determinable. In determining the discount rate used for lease liabilities, the Partnership analyzed certain factors in its incremental borrowing rate, including collateral assumptions and the term used. The Partnership’s incremental borrowing rate was 6.43% at December 31, 2023, which reflects the rate at which the Partnership could borrow a similar amount, for a similar term and with similar collateral as in the lease contracts at the commencement date.

ROU assets (included in the other noncurrent assets caption on the Partnership’s consolidated balance sheet) and lease liabilities (included in the Other current liabilities and Other noncurrent liabilities captions on the Partnership’s consolidated balance sheet) follow:

	December 31, 2023		December 31, 2022
	(In thousands)
ROU assets
Operating	$	10,352	$	11,633
Finance	2,400		1,389
	$	12,752	$	13,022
Lease liabilities, current
Operating	$	3,341	$	2,570
Finance	870		435
	$	4,211	$	3,005
Lease liabilities, noncurrent
Operating	$	7,360	$	9,672
Finance	1,197		679
	$	8,557	$	10,351

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Lease cost and Other information follow:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease cost
Finance lease cost:
Amortization of ROU assets (included in depreciation and amortization)	$	686	$	673
Interest on lease liabilities (included in interest expense)	62		18
Operating lease cost (included in general and administrative expense)	1,999		1,815
	$	2,747	$	2,506

	Year ended December 31,
	2023			2022
	(In thousands)
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash outflows from operating leases	$	3,975		$	1,732
Operating cash outflows from finance leases	62			18
Financing cash outflows from finance leases	610			330
ROU assets obtained in exchange for new operating lease liabilities	3,516			9,865
ROU assets obtained in exchange for new finance lease liabilities	1,238			1,298
Weighted-average remaining lease term (years) - operating leases	3.6			4.7
Weighted-average remaining lease term (years) - finance leases	2.5			2.4
Weighted-average discount rate - operating leases	6		%	6		%
Weighted-average discount rate - finance leases	5		%	3		%

The Partnership recognizes total lease expense incurred or allocated to us in general and administrative expenses. Lease expense related to operating leases, including lease expense incurred on the Partnership’s behalf and allocated to us, was as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease expense	$	5,898	$	3,162

Future minimum lease payments due under noncancelable leases at December 31, 2023, were as follows:

	December 31, 2023
	(In thousands)
	Operating		Finance
2024	$	4,067	$	870
2025	3,573		736
2026	2,468		374
2027	2,074		87
2028	61		—
2029	27		—
Thereafter	330		—
Total future minimum lease payments	$	12,600	$	2,067

17. SEGMENT INFORMATION

As of December 31, 2023, the Partnership’s current reportable segments are:

•Rockies – Includes the Partnership’s wholly owned midstream assets located in the Williston Basin and the DJ Basin.

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•Permian – Includes the Partnership’s equity method investment in Double E.

•Northeast – Includes the Partnership’s wholly owned midstream assets located in the Utica and Marcellus shale plays and the equity method investment in Ohio Gathering that is focused on the Utica Shale.

•Piceance – Includes the Partnership’s wholly owned midstream assets located in the Piceance Basin.

•Barnett – Includes the Partnership’s wholly owned midstream assets located in the Barnett Shale.

Corporate and Other represents those results that: (i) are not specifically attributable to a reportable segment; (ii) are not individually reportable; or (iii) have not been allocated to a reportable segments for the purpose of evaluating their performance, including certain general and administrative expense items, certain natural gas and crude oil marketing services and transaction costs.

Assets by reportable segment follow.

	December 31,
	2023		2022
	(in thousands)
Assets:
Northeast	$	573,663	$	591,091
Rockies	904,974		886,629
Permian	291,073		298,906
Piceance	431,687		475,719
Barnett	281,861		295,473
Total reportable segment assets	2,483,258		2,547,818
Corporate and Other	10,940		12,146
Total assets	$	2,494,198	$	2,559,964

Revenues by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Revenues:
Northeast	$	63,805	$	54,392
Rockies	255,031		143,603
Permian	3,570		25,151
Piceance	91,417		93,349
Barnett	45,117		52,096
Total reportable segments revenue	458,940		368,591
Corporate and Other	(37)		1,003
Total revenues	$	458,903	$	369,594

Counterparties accounting for a significant portion of total revenues were as follows:

	Year ended December 31,
	2023		2022
Percentage of total revenues:
Counterparty A - Piceance	10	%	13	%
Counterparty B - Rockies	13	%	*

________________________________________________________

* Less than 10% in the aggregate

Depreciation and amortization, including the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in other revenues, by reportable segment follow.

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	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation and amortization:
Northeast	$	17,856	$	17,501
Rockies	36,148		30,532
Permian	—		2,736
Piceance	52,014		51,352
Barnett(1)	16,171		16,116
Total reportable segment depreciation and amortization	122,189		118,237
Corporate and Other	1,513		1,756
Total depreciation and amortization	$	123,702	$	119,993

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in Other revenues.

Cash paid for capital expenditures by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Cash paid for capital expenditures:
Northeast	$	4,695	$	8,743
Rockies	54,969		11,903
Permian	—		1,407
Piceance	4,544		6,116
Barnett	186		366
Total reportable segment capital expenditures	64,394		28,535
Corporate and Other	4,511		1,937
Total cash paid for capital expenditures	$	68,905	$	30,472

The Partnership assesses the performance of its reportable segments based on segment adjusted EBITDA. The Partnership defines segment adjusted EBITDA as total revenues less total costs and expenses; plus (i) other income excluding interest income, (ii) proportional adjusted EBITDA for equity method investees, (iii) depreciation and amortization, (iv) adjustments related to MVC shortfall payments, (v) adjustments related to capital reimbursement activity, (vi) unit-based and noncash compensation, (vii) impairments (vii) other noncash expenses or losses, less other noncash income or gains and (ix) restructuring expenses. Proportional adjusted EBITDA for the Partnership’s equity method investees is defined as the product of (i) total revenues less total expenses, excluding impairments and other noncash income or expense items, and amortization for deferred contract costs; and (ii) ownership interest in Ohio Gathering during the respective period.

For the purpose of evaluating segment performance, the Partnership excludes the effect of Corporate and Other revenues and expenses, such as certain general and administrative expenses (including compensation-related expenses and professional services fees), certain natural gas and crude oil marketing services, transaction costs, interest expense and income tax expense or benefit from segment adjusted EBITDA.

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Segment adjusted EBITDA by reportable segment follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reportable segment adjusted EBITDA
Northeast	$	94,249	$	77,046
Rockies	87,390		57,810
Permian	24,207		18,051
Piceance	59,749		60,055
Barnett	26,171		31,624
Total of reportable segments' measures of profit	$	291,766	$	244,586

A reconciliation of income or loss before income taxes and income or loss from equity method investees to total of reportable segments' measures of profit or loss follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reconciliation of loss before income taxes and income from equity method investees to total of reportable segments' measures of profit:
Loss before income taxes and income from equity method investees	$	(72,454)	$	(141,277)
Add:
Corporate and Other expense	30,758		29,118
Interest expense	140,784		102,459
Loss on early extinguishment of debt	10,934		—
Depreciation and amortization(1)	123,702		119,993
Proportional adjusted EBITDA for equity method investees	61,070		45,419
Adjustments related to capital reimbursement activity	(9,874)		(6,041)
Unit-based and noncash compensation	6,566		3,778
Gain on asset sales, net	(260)		(507)
Long-lived asset impairment	540		91,644
Total of reportable segments' measures of profit	$	291,766	$	244,586

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable gas gathering contracts as reported in other revenues.

Contributions in aid of construction are recognized over the remaining term of the respective contract. The Partnership includes adjustments related to capital reimbursement activity in its calculation of segment adjusted EBITDA to account for revenue recognized from contributions in aid of construction.

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

There have been no changes in, or disagreements with, accountants on accounting and financial disclosure matters during the years ended December 31, 2023 and 2022.

Item 9A. Controls and Procedures.

Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit to the Securities and Exchange Commission under the Exchange Act, is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms, and that information is accumulated and communicated to the management of our General Partner, including our General Partner’s principal executive and principal financial officers (whom we refer to as the Certifying Officers), as appropriate to allow timely decisions regarding required disclosure. 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 Exchange Act) as of the end of the period covered by this annual 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 fourth fiscal quarter of 2023 that have materially affected, or are reasonably likely to materially affect, SMLP's internal control over financial reporting.

Management’s Annual Report on Internal Control Over Financial Reporting

Our General Partner is responsible for establishing and maintaining adequate internal control over financial reporting for the Partnership. With our participation, an evaluation of the effectiveness of our internal control over financial reporting was conducted as of December 31, 2023, based on the framework and criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management has concluded that our internal control over financial reporting was effective as of December 31, 2023.

Our independent registered public accounting firm has issued an audit report on our internal control over financial reporting, included below this report.

/s/ J. HEATH DENEKE

J. Heath Deneke

President and Chief Executive Officer, Summit Midstream GP,
LLC (the General Partner of SMLP)

/s/ WILLIAM J. MAULT

William J. Mault

Executive Vice President and Chief Financial Officer, Summit
Midstream GP, LLC (the General Partner of SMLP)

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of Summit Midstream, GP, LLC and the unitholders of Summit Midstream Partners, LP

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Summit Midstream Partners, LP and subsidiaries (the “Partnership”) as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2023, of the Partnership and our report dated March 15, 2024, expressed an unqualified opinion on those financial statements based on our audit.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

An entity’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. An entity’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the entity; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the entity are being made only in accordance with authorizations of management and directors of the entity; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the entity’s assets that could have a material effect on the financial statements.

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

/s/ Deloitte & Touche, LLP

Houston, Texas

March 15, 2024

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Item 9B. Other Information.

During the three months ended December 31, 2023, no director or officer of the General Partner adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

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Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.

Not applicable.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance.

This information is incorporated by reference to the Partnership’s Proxy Statement for its 2024 Annual Meeting of Limited Partners, which will be filed with the SEC within 120 days of December 31, 2023.

Item 11. Executive Compensation.

This information is incorporated by reference to the Partnership’s Proxy Statement for its 2024 Annual Meeting of Limited Partners, which will be filed with the SEC within 120 days of December 31, 2023.

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

This information is incorporated by reference to the Partnership’s Proxy Statement for its 2024 Annual Meeting of Limited Partners, which will be filed with the SEC within 120 days of December 31, 2023.

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

This information is incorporated by reference to the Partnership’s Proxy Statement for its 2024 Annual Meeting of Limited Partners, which will be filed with the SEC within 120 days of December 31, 2023.

Item 14. Principal Accounting Fees and Services.

This information is incorporated by reference to the Partnership's Proxy Statement for its 2024 Annual Meeting of Limited Partners, which will be filed with the SEC within 120 days of December 31, 2023.

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PART IV

Item 15. Exhibits, Financial Statement Schedules.

(a)(1) Financial Statements

Our Consolidated Financial Statements and accompanying footnotes are included in Part II, Item 8, of this report.

(2) Financial Statement Schedules

All schedules are omitted because the required information is inapplicable or the information is presented in the financial statements or the notes thereto.

(3) Exhibit Index

The exhibits listed on the accompanying Exhibit Index are filed as part of, or incorporated by reference into, this Annual Report.

Exhibit number	Description
2.1	Purchase Agreement, dated May 3, 2020, by and among Energy Capital Partners II, LP, Energy Capital Partners II-A, LP, Energy Capital Partners II-C (SMLP IP), LP, Energy Capital Partners II-C (Summit IP), LP, Energy Capital Partners II (Summit Co-Invest), LP and Summit Midstream Management, LLC, as contributors, SMP TopCo, LLC and SMLP Holdings, LLC, as sellers, Summit Midstream Partners, LP, as the acquiror, and, solely for certain purposes set forth therein, Summit Midstream Partners GP, LLC (Incorporated herein by reference to Exhibit 2.1 to SMLP's Current Report on Form 8-K dated May 5, 2020 (Commission File No. 001-35666))
2.2	Purchase and Sale Agreement, dated as of June 9, 2022, among Summit Midstream Holdings, LLC as Seller, Longwood Gathering and Disposal Systems, LP as Buyer, and Summit Midstream Partners LP (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Quarterly Report on Form 10-Q for the three months ended June 30, 2022 dated August 5, 2022 (Commission File No. 001-35666))
2.3	Purchase and Sale Agreement between Summit Midstream Holdings, LLC and Steel Reef US Corp. dated September 19, 2022 (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Quarterly Report on Form 10-Q for the three months ended September 30, 2022 dated November 7, 2022 (Commission File No. 001-35666))
2.4	Membership Interest Purchase and Sale Agreement between Summit Midstream Holdings, LLC, Outrigger Energy II LLC and Outrigger DJ Midstream LLC, dated October 14, 2022 (Incorporated herein by reference to Exhibit 2.4 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
2.5	Purchase and Sale Agreement between Summit Midstream Holdings, LLC and Sterling Investment Holdings, dated October 14, 2022 (Incorporated herein by reference to Exhibit 2.5 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
3.1	Fourth Amended and Restated Agreement of Limited Partnership of Summit Midstream Partners, LP, dated May 28, 2020 (Incorporated herein by reference to Exhibit 3.1 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
3.2	First Amendment to Fourth Amended and Restated Agreement of Limited Partnership of Summit Midstream Partners, LP, dated February 23, 2023 (Incorporated herein by reference to Exhibit 3.2 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
3.3	Second Amended and Restated Limited Liability Company Agreement of Summit Midstream GP, LLC, dated May 28, 2020 (Incorporated herein by reference to Exhibit 3.2 to SMLP's Current Report on Form 8-K filed June 2, 2020 (Commission File No. 001-35666))
3.4	Certificate of Limited Partnership of Summit Midstream Partners, LP (Incorporated herein by reference to Exhibit 3.1 to SMLP's Form S-1 Registration Statement dated August 21, 2012 (Commission File No. 333-183466))
3.5	Certificate of Formation of Summit Midstream GP, LLC (Incorporated herein by reference to Exhibit 3.4 to SMLP's Form S-1 Registration Statement dated August 21, 2012 (Commission File No. 333-183466))
4.1	Description of Common Units (Incorporated herein by reference to Exhibit 4.1 to SMLP’s Form 10-K/A dated April 26, 2021 (Commission File No. 333-183466))

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4.2	Investor Rights Agreement, dated as of October 3, 2012, by and among EFS-S, LLC, Summit Midstream GP, LLC and Summit Midstream Partners, LLC (Incorporated herein by reference to Exhibit 4.1 to SMLP's Current Report on Form 8-K dated October 4, 2012 (Commission File No. 001-35666))
10.1	Strict Foreclosure Agreement, dated November 17, 2020, by and among Summit Midstream Partners Holdings, LLC, Summit Midstream Partners, LLC and Credit Suisse AG, Cayman Islands Branch (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K dated November 17, 2020 (Commission File No. 001-35666))
10.2	General Assignment and Bill of Sale, dated November 17, 2020, by Summit Midstream Partners Holdings, LLC and Summit Midstream Partners, LLC (Incorporated herein by reference to Exhibit 10.2 to SMLP’s Current Report on Form 8-K dated November 17, 2020 (Commission File No. 001-35666))
10.3	Mutual Release Agreement, dated November 17, 2020, by and among Summit Midstream Partners Holdings, LLC, Summit Midstream Partners, LLC, the lenders party thereto, and Credit Suisse AG, Cayman Islands Branch (Incorporated herein by reference to Exhibit 10.3 to SMLP’s Current Report on Form 8-K dated November 17, 2020 (Commission File No. 001-35666)).
10.4	Term Loan Credit Agreement, dated May 28, 2020, by and among Summit Midstream Holdings, LLC, as borrower, SMP TopCo, LLC, as lender and administrative agent and Mizuho Bank (USA), as collateral agent (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.5	Term Loan Credit Agreement, dated May 28, 2020, by and among Summit Midstream Holdings, LLC, as borrower, SMLP Holdings, LLC, as lender, SMP TopCo, LLC, as administrative agent and Mizuho Bank (USA), as collateral agent (Incorporated herein by reference to Exhibit 10.2 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.6	Guarantee and Collateral Agreement, dated May 28, 2020, by and among Summit Midstream Holdings, LLC, Summit Midstream Partners, LP, the subsidiaries listed therein and Mizuho Bank (USA), as collateral agent, relating to the ECP NewCo Term Loan Credit Agreement (Incorporated herein by reference to Exhibit 10.3 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.7	Guarantee and Collateral Agreement, dated May 28, 2020, by and among Summit Midstream Holdings, LLC, Summit Midstream Partners, LP, the subsidiaries listed therein and Mizuho Bank (USA), as collateral agent, relating to the ECP Holdings Term Loan Credit Agreement (Incorporated herein by reference to Exhibit 10.4 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.8	Pari Passu Intercreditor Agreement, dated as of May 28, 2020, among Wells Fargo Bank, National Association, as Revolving Credit Facility Collateral Agent, Mizuho Bank (USA), as NewCo Term Loan Collateral Agent and SMLP Holdings Term Loan Collateral Agent, Summit Midstream Holdings, LLC and other grantors from time to time party thereto (Incorporated herein by reference to Exhibit 10.5 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.9	Warrant to Purchase Common Units, dated May 28, 2020, from Summit Midstream Partners, LP to SMP TopCo, LLC (Incorporated herein by reference to Exhibit 10.6 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.10	Warrant to Purchase Common Units, dated May 28, 2020, from Summit Midstream Partners, LP to SMLP Holdings, LLC (Incorporated herein by reference to Exhibit 10.7 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.11	Operation and Management Services Agreement, dated May 28, 2020, by and among Summit Midstream Partners, LP and Summit Operating Services Company, LLC (Incorporated herein by reference to Exhibit 10.8 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.12	Term Loan Agreement, dated as of March 21, 2017, among Summit Midstream Partners Holdings, LLC, as borrower, the lenders party thereto and Credit Suisse AG, Cayman Islands Branch, as Administrative Agent and Collateral Agent (Incorporated herein by reference to Exhibit 10.9 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))
10.13	Guarantee and Collateral Agreement, dated as of March 21, 2017, by and among Summit Midstream Partners Holdings, LLC, as grantor, Summit Midstream Partners, LLC, as pledgor and grantor and Credit Suisse AG, Cayman Islands Branch, as collateral agent (Incorporated herein by reference to Exhibit 10.10 to SMLP’s Current Report on Form 8-K dated June 2, 2020 (Commission File No. 001-35666))

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10.14	Amendment to Warrants to Purchase Common Units, dated August 7, 2020, by and among Summit Midstream Partners, LP, SMP TopCo, LLC and SMLP Holdings, LLC (Incorporated herein by reference to Exhibit 10.11 to SMLP’s Quarterly Report on Form 10-Q for the period ended September 30, 2020 (Commission File No. 001-35666))
10.15	Transaction Support Agreement, dated September 29, 2020, by and among Summit Midstream Partners Holdings, LLC, Summit Midstream Partners, LLC, Summit Midstream Partners, LP and the Initial Directing Lenders listed therein (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K dated September 30, 2020 (Commission File No. 001-34666))
10.16	Purchase Agreement, dated as of June 12, 2013, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., Summit Midstream GP, LLC, the Guarantors named therein and the Initial Purchasers named therein (Incorporated herein by reference to Exhibit 1.1 to SMLP's Current Report on Form 8-K dated June 17, 2013 (Commission File No. 001-35666))
10.17	Purchase and Sale Agreement between Meadowlark Midstream Company, LLC, Tioga Midstream, LLC and Hess North Dakota Pipelines LLC dated as of February 22, 2019 (Incorporated herein by reference to Exhibit 10.1 to SMLP's Current Report on Form 8-K dated February 26, 2019 (Commission File No. 001-35666))
10.18	Purchase and Sale Agreement between Meadowlark Midstream Company, LLC, Tioga Midstream, LLC and Hess Infrastructure Partners LP dated as of February 22, 2019 (Incorporated herein by reference to Exhibit 10.2 to SMLP's Current Report on Form 8-K dated February 26, 2019 (Commission File No. 001-35666))
10.19	Indenture, dated as of June 17, 2013, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors party thereto and U.S. Bank National Association (including form of the 7½% senior notes due 2021) (Incorporated herein by reference to Exhibit 4.1 to SMLP's Current Report on Form 8-K dated June 17, 2013 (Commission File No. 001-35666))
10.20	Registration Rights Agreement, dated as of June 17, 2013, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors named therein and the Initial Purchasers named therein (Incorporated herein by reference to Exhibit 4.2 to SMLP's Current Report on Form 8-K dated June 17, 2013 (Commission File No. 001-35666))
10.21	Joinder Agreement, dated as of June 4, 2013, by and among Summit Midstream Holdings, LLC, The Royal Bank of Scotland plc, as Administrative Agent, and the lenders party thereto (Incorporated herein by reference to Exhibit 10.2 to SMLP's Current Report on Form 8-K dated June 5, 2013 (Commission File No. 001-35666))
10.22	Third Amended and Restated Credit Agreement dated as of May 26, 2017 (Incorporated herein by reference to Exhibit 10.1 to SMLP's Current Report on Form 8-K dated May 30, 2017 (Commission File No. 001-35666))
10.23	First Amendment to the Third Amended and Restated Credit Agreement dated as of September 22, 2017 (Incorporated herein by reference to Exhibit 10.7 to SMLP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 (Commission File No. 001-35666))
10.24	Second Amendment to Third Amended and Restated Credit Agreement dated as of June 26, 2019 (Incorporated herein by reference to Exhibit 10.2 to SMLP's Quarterly Report on Form 10-Q dated August 9, 2019 (Commission File No. 001-35666))
10.25	Third Amendment to Third Amended and Restated Credit Agreement and Second Amendment to Second Amended and Restated Guarantee and Collateral Agreement dated as of December 24, 2019 (Incorporated by reference to Exhibit 10.11 to SMLP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (Commission File No. 001-35666))
10.26	Fourth Amendment to Third Amended and Restated Credit Agreement and Third Amendment to Second Amended and Restated Guarantee and Collateral Agreement, dated as of December 18, 2020, by and among Summit Midstream Holdings, LLC, each of the other Loan Parties party thereto, Wells Fargo Bank, National Association, as administrative and collateral agent and the Lenders party thereto (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current. Report on Form 8-K dated December 18, 2020 (Commission File No. 01-35666))
10.27	Amended and Restated Limited Liability Company Agreement of Summit Permian Transmission Holdco, LLC, dated as of December 24, 2019 (Incorporated by reference to Exhibit 10.12 to SMLP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (Commission File No. 001-35666))

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10.28		Amended and Restated Guarantee and Collateral Agreement dated as of November 1, 2013 (Incorporated herein by reference to Exhibit 10.7 to SMLP's 2013 Annual Report on Form 10-K for the fiscal year ended December 31, 2013 (Commission File No. 001-35666))
10.29		Base Indenture, dated as of July 15, 2014, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp. and U.S. Bank National Association (Incorporated herein by reference to Exhibit 4.1 to SMLP's Current Report on Form 8-K dated July 9, 2014 (Commission File No. 001-35666))
10.30		First Supplemental Indenture, dated as of July 15, 2014, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors party thereto and U.S. Bank National Association (including form of the 5½% senior notes due 2022) (Incorporated herein by reference to Exhibit 4.2 to SMLP's Current Report on Form 8-K dated July 9, 2014 (Commission File No. 001-35666))
10.31		Second Supplemental Indenture, dated as of February 15, 2017, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors party thereto and U.S. Bank National Association (including form of the 5.75% senior notes due 2025) (Incorporated herein by reference to Exhibit 4.2 to SMLP’s Current Report on Form 8-K dated February 17, 2017 (Commission File No. 001-35666))
10.32		Equity Distribution Agreement, dated June 12, 2015, among the Partnership, the General Partner, the Operating Company, Citigroup Global Markets Inc., Deutsche Bank Securities Inc. and RBC Capital Markets, LLC. (Incorporated herein by reference to Exhibit 1.1 to SMLP's Current Report on Form 8-K dated June 12, 2015 (Commission File No. 001-35666))
10.33		Contribution Agreement between Summit Midstream Partners Holdings, LLC and Summit Midstream Partners, LP dated as of February 25, 2016 (Incorporated herein by reference to Exhibit 10.1 to SMLP's Form 8-K filed March 1, 2016 (Commission File No. 001-35666))
10.34		Amendment to Contribution Agreement between Summit Midstream Partners Holdings, LLC and Summit Midstream Partners, LP dated February 25, 2019 (Incorporated herein by reference to Exhibit 10.3 to SMLP's Current Report on Form 8-K dated February 26, 2019 (Commission File No. 001-35666))
10.35		Amendment No. 2 to Contribution Agreement between Summit Midstream Partners Holdings, LLC and Summit Midstream Partners, LP dated November 7, 2019 (Incorporated herein by reference to Exhibit 10.1 to SMLP's Current Report on Form 8-K dated November 8, 2019 (Commission File No. 001-35666))
10.36		Amendment No. 3 to Contribution Agreement, dated November 17, 2020, by and between Summit Midstream Partners Holdings, LLC and Summit Midstream Partners, LP (Incorporated herein by reference to Exhibit 10.4 to SMLP’s Current Report on Form 8-K dated November 17, 2020 (Commission File No. 001-35666))
10.37		Credit Agreement, dated as of March 8, 2021, among Summit Permian Transmission, LLC, as borrower, MUFG Bank Ltd., as administrative agent, Mizuho Bank (USA), as collateral agent, ING Capital LLC, Mizuho Bank, Ltd. and MUFG Union Bank, N.A., as L/C issuers, coordinating lead arrangers and joint bookrunners, and the lenders from time to time party thereto (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Quarterly Report on Form 10-Q dated May 7, 2021 (Commission File No. 333-183466))
10.38		Joint Factual Statement (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Quarterly Report on Form 10-Q for the three months ended June 30, 2021 dated August 9, 2021 (Commission File No. 333-183466))
10.39		Criminal Plea Agreement (Incorporated herein by reference to Exhibit 10.2 to SMLP’s Quarterly Report on Form 10-Q for the three months ended June 30, 2021 dated August 9, 2021 (Commission File No. 333-183466))
10.40		Consent Decree (Incorporated herein by reference to Exhibit 10.3 to SMLP’s Quarterly Report on Form 10-Q for the three months ended June 30, 2021 dated August 9, 2021 (Commission File No. 333-183466))
10.41	†	Indenture, dated as of November 2, 2021, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors party thereto and Regions Bank, as trustee (including form of the 8.500% Senior Secured Second Lien Notes due 2026) (Incorporated herein by reference to Exhibit 4.1 to SMLP's Quarterly Report on Form 10-Q dated November 4, 2021 (Commission File No. 001-35666))
10.42		Collateral Agreement, dated as of November 2, 2021, by and among Summit Midstream Partners, LP, as a pledgor, Summit Midstream Holdings, LLC and Summit Midstream Finance Corp., as pledgors and grantors, the Subsidiary Guarantors party therein, and Regions Bank, as collateral agent (Incorporated herein by reference to Exhibit 10.4 to SMLP’s Quarterly Report on Form 10-Q for the three months ended September 30, 2021 dated November 4, 2021 (Commission File No. 333-183466))

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10.43		Loan and Security Agreement, dated as November 2, 2021, among Summit Midstream Holdings, as borrower, Summit Midstream Partners, LP and certain subsidiaries from time to time party thereto, as guarantors, Bank of America, N.A., as agent, ING Capital LLC, Royal Bank of Canada and Regions Bank, as co-syndication agents, joint lead arrangers and joint bookrunners (Incorporated herein by reference to Exhibit 10.5 to SMLP’s Quarterly Report on Form 10-Q for the three months ended September 30, 2021 dated November 4, 2021 (Commission File No. 333-183466))
10.44	†	Intercreditor Agreement, dated as of November 2, 2021, by and among Bank of America, N.A., as first lien representative and collateral agent for the initial first lien claimholders, Regions Bank, as second lien representative for the initial second lien claimholders and as collateral agent for the initial second lien claimholders, acknowledged and agreed to by Summit Midstream Holdings, LLC and the other grantors referred to therein (Incorporated herein by reference to Exhibit 10.6 to SMLP’s Quarterly Report on Form 10-Q for the three months ended September 30, 2021 dated November 4, 2021 (Commission File No. 333-183466))
10.45		Equity Restructuring Agreement by and among Summit Midstream Partners, LP, Summit Midstream GP, LLC and Summit Midstream Partners Holdings, LLC dated as of February 25, 2019 (Incorporated herein by reference to Exhibit 10.4 to SMLP's Current Report on Form 8-K dated February 26, 2019 (Commission File No. 001-35666))
10.46	*	Amended and Restated Employment Agreement, effective September 1, 2020, by and between Summit Midstream Partners, LLC and Marc D. Stratton (Incorporated herein by reference to Exhibit 10.41 to SMLP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (Commission File No. 001-35666))
10.47	*	Form of Retention Bonus Agreement (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K dated June 11, 2019 (Commission File Number 001-35666))
10.48	*	Employment Agreement, effective as of September 4, 2020, by and between Summit Midstream Partners, LP and James Johnston (Incorporated herein by reference to Exhibit 10.4 to SMLP’s Form 10-Q dated November 6, 2020 (Commission File No. 001-35666))
10.49	*	Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated (incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K dated March 20, 2020 (Commission File No. 001-35666))
10.50	*	Summit Midstream Partners, LP 2012 Long-Term Incentive Plan Phantom Unit Agreement (Incorporated herein by reference to Exhibit 10.1 to SMLP's Current Report on Form 8-K filed March 17, 2014 (Commission File No. 001-35666))
10.51	*	Form of Director Unit Award Agreement (Incorporated herein by reference to Exhibit 10.3 to SMLP's Current Report on Form 8-K filed October 4, 2012 (Commission File No. 001-35666))
10.52	*	Summit Midstream Partners, LLC Deferred Compensation Plan effective as of July 1, 2013 (Incorporated herein by reference to Exhibit 4.3 to SMLP's Form S-8 Registration Statement dated June 28, 2013 (Commission File No. 333-189684))
10.53	*	Form of Summit Midstream Partners, LP 2012 Long-Term Incentive Plan Grant Award Agreement (Incorporated herein by reference to Exhibit 10.54 to SMLP’s Annual Report on Form 10-K filed February 28, 2022 (Commission File No. 001-35666))
10.54	*	Summit Midstream Partners, LP 2022 Long-Term Incentive Plan (incorporated herein by reference to Appendix B to SMLP’s definitive proxy statement on Schedule 14A filed March 31, 2022 (Commission File No. 001-35666))
10.55	*	Amended and Restated Employment Agreement, effective as of September 4, 2020, by and between Summit Operating Services Company, LLC and Heath Deneke (Incorporated herein by reference to Exhibit 10.2 to SMLP’s Quarterly Report on Form 10-Q for the three months ended March 31, 2022 dated May 5, 2022 (Commission File No. 001-35666))
10.56		Collateral Agreement, dated as of November 14, 2022, by and among Summit Midstream Partners, LP, as a pledgor, Summit Midstream Holdings, LLC and Summit Midstream Finance Corp., as pledgors and grantors, the Subsidiary Guarantors party therein, and Regions Bank, as collateral agent (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K filed November 15, 2022 (Commission File No. 001-35666))

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10.57		Second Lien Pari Passu Intercreditor Agreement, dated as of November 14, 2022, by and among Regions Bank, as the initial second lien representative and the initial second lien collateral agent for the 2021 indenture claimholders, Regions Bank, as additional initial second lien representative and additional initial second lien collateral agent, Summit Midstream Partners, LP, Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., and the other Grantors party thereto (Incorporated herein by reference to Exhibit 10.2 to SMLP’s Current Report on Form 8-K filed November 15, 2022 (Commission File No. 001-35666))
10.58	*	Amended and Restated Employment Agreement, effective as of February 23, 2023, by and between Summit Operating Services Company, LLC and Heath Deneke (Incorporated herein by reference to Exhibit 10.58 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.59	*	Amended and Restated Employment Agreement, effective as of February 23, 2023, by and between Summit Operating Services Company, LLC and William (Bill) Mault (Incorporated herein by reference to Exhibit 10.59 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.60	*	Amended and Restated Employment Agreement, effective as of February 23, 2023, by and between Summit Operating Services Company, LLC and James Johnston (Incorporated herein by reference to Exhibit 10.60 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.61	*	Amended and Restated Employment Agreement, effective as of February 23, 2023, by and between Summit Operating Services Company, LLC and Matthew Sicinski (Incorporated herein by reference to Exhibit 10.61 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.62	*	Summit Midstream Partners, LP 2022 Long-Term Incentive Plan 2023 LTIP Grant Award Agreement for Performance-based Phantom Units, effective as of February 23, 2023 (Incorporated herein by reference to Exhibit 10.62 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.63	*	Summit Midstream Partners, LP 2022 Long-Term Incentive Plan 2023 LTIP Grant Award Agreement for Time-based Phantom Units, effective as of February 23, 2023 (Incorporated herein by reference to Exhibit 10.63 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.64	*	Form of Summit Midstream Partners, LP 2012 Long-Term Incentive Plan 2021 Grant Award Agreement (Incorporated herein by reference to Exhibit 10.64 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.65	*	Form of Summit Midstream Partners, LP 2022 Long-Term Incentive Plan Director Unit Agreement (Incorporated herein by reference to Exhibit 10.65 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.66	*	Form of Summit Midstream Partners, LP 2023 Long-Term Incentive Plan Director Unit Agreement (Incorporated herein by reference to Exhibit 10.66 to SMLP’s Annual Report on Form 10-K filed March 1, 2023 (Commission File No. 001-35666))
10.67		First Amendment to Loan and Security Agreement, dated October 14, 2022, by and among Summit Midstream Partners, LP, Summit Midstream Holdings, LLC and Bank of America, N.A. (Incorporated herein by Incorporated herein by reference to Exhibit 10.1 to SMLP’s Quarterly Report on Form 10-Q filed August 9, 2023 (Commission File No. 001-35666))
10.68		Second Amendment to Loan and Security Agreement, dated May 10, 2023, by and among Summit Midstream Partners, LP, Summit Midstream Holdings, LLC and Bank of America, N.A. (Incorporated herein by Incorporated herein by reference to Exhibit 10.2 to SMLP’s Quarterly Report on Form 10-Q filed August 9, 2023 (Commission File No. 001-35666))
10.69		Omnibus Amendment, dated June 27, 2023, by and among Summit Permian Transmission, LLC, MUFG Bank, Ltd., Mizuho Bank (USA), Mizuho Bank, Ltd. and the lenders party thereto (Incorporated herein by Incorporated herein by reference to Exhibit 10.3 to SMLP’s Quarterly Report on Form 10-Q filed August 9, 2023 (Commission File No. 001-35666))
10.70		Indenture, dated as of November 21, 2023, by and among Summit Midstream Holdings, LLC, Summit Midstream Finance Corp., the Guarantors party thereto and Regions Bank, as trustee (including form of the 12.00% Senior Unsecured Notes due 2026) (Incorporated herein by reference to Exhibit 4.1 to SMLP’s Current Report on Form 8-K filed November 22, 2023 (Commission File No. 001-35666))

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10.71		Third Amendment to Loan and Security Agreement, dated November 21, 2023, among Summit Midstream Partners, LP, Summit Midstream Holdings, LLC, the lenders party thereto and Bank of America, N.A., as agent for such lenders (Incorporated herein by reference to Exhibit 10.1 to SMLP’s Current Report on Form 8-K filed November 22, 2023 (Commission File No. 001-35666))
21.1	***	List of Subsidiaries
22.1	***	Summit Midstream Partners, LP Subsidiary Issuers and Guarantors of Registered Securities
23.1	***	Consent of Deloitte & Touche LLP
31.1	***	Rule 13a-14(a)/15d-14(a) Certification, executed by Heath Deneke, President, Chief Executive Officer and Director
31.2	***	Rule 13a-14(a)/15d-14(a) Certification, executed by William J. Mault, Executive 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 Heath Deneke, President, Chief Executive Officer and Director, and William J. Mault, Executive Vice President and Chief Financial Officer
97.1	***	Summit Midstream Partners, LP Policy for the Recovery of Erroneously Awarded Compensation, effective as of October 2, 2023.
101.INS	**	XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	**	Inline XBRL Taxonomy Extension Schema
101.CAL	**	Inline XBRL Taxonomy Extension Calculation Linkbase
101.DEF	**	Inline XBRL Taxonomy Extension Definition Linkbase
101.LAB	**	Inline XBRL Taxonomy Extension Label Linkbase
101.PRE	**	Inline XBRL Taxonomy Extension Presentation Linkbase
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

* Management contract or compensatory plan or arrangement required to be filed as an exhibit pursuant to Item 15(b) of this report

† Certain portions have been omitted pursuant to a confidential treatment request. Omitted information has been filed separately with the SEC.

** 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.

*** Filed herewith

**** Furnished herewith

(c) Financial Statement Schedules

Not applicable.

Item 16. Form 10-K Summary.

Not applicable.

142

Table of Contents

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Summit Midstream Partners, LP
	(Registrant)
	By:  Summit Midstream GP, LLC (its General Partner)
March 15, 2024	/s/ WILLIAM J. MAULT
	William J. Mault, Executive Vice President and Chief Financial Officer (Principal Financial Officer)

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

Signature	Title	Date
/s/ J. HEATH DENEKE	Director, President and Chief Executive Officer (Principal Executive Officer)	March 15, 2024
J. Heath Deneke
/s/ WILLIAM J. MAULT	Executive Vice President and Chief Financial Officer (Principal Financial Officer)	March 15, 2024
William J. Mault
/s/ MATTHEW B. SICINSKI	Senior Vice President and Chief Accounting Officer (Principal Accounting Officer)	March 15, 2024
Matthew B. Sicinski
/s/ JAMES J. CLEARY	Director	March 15, 2024
James J. Cleary
/s/ LEE JACOBE	Director	March 15, 2024
Lee Jacobe
/s/ ROBERT J. MCNALLY	Director	March 15, 2024
Robert J. McNally
/s/ ROMMEL M. OATES	Director	March 15, 2024
Rommel M. Oates
/s/ JERRY L. PETERS	Director	March 15, 2024
Jerry L. Peters
/s/ MARGUERITE WOUNG-CHAPMAN	Director	March 15, 2024
Marguerite Woung-Chapman

143

EX-21.1

EXHIBIT 21.1 Name State or other jurisdiction of incorporation or organization DFW Midstream Services LLC Delaware Centennial Water Pipelines LLC Delaware Double E Pipeline, LLC Delaware Epping Transmission Company, LLC Delaware Grand River Gathering, LLC Delaware Grasslands Energy Marketing LLC Delaware Meadowlark Midstream Company, LLC Delaware Mountaineer Midstream Company, LLC Delaware Polar Midstream, LLC Delaware Red Rock Gathering Company, LLC Delaware Summit Climate Solutions, LLC Delaware Summit Contribution Holdings, LLC Delaware Summit DJ-O Operating, LLC Delaware Summit DJ-O, LLC Delaware Summit DJ-S Pipeline Company Delaware Summit DJ-S, LLC Delaware Summit Management Holdings, LLC Delaware Summit Midstream Finance Corp. Delaware Summit Midstream GP, LLC Delaware Summit Midstream Holdings, LLC Delaware Summit Midstream Marketing, LLC Delaware Summit Midstream Niobrara, LLC Delaware Summit Midstream OpCo, LP Delaware Summit Midstream Partners Holdings, LLC Delaware Summit Midstream Partners, LLC Delaware Summit Midstream Permian II, LLC Delaware Summit Midstream Utica, LLC Delaware Summit Operating Services Company, LLC Delaware Summit Permian Transmission Holdco, LLC Delaware Summit Permian Transmission, LLC Delaware SUMMIT MIDSTREAM PARTNERS, LP LIST OF SUBSIDIARIES

EX-22.1

EXHIBIT 22.1 Subsidiary Registered Security Guarantor Status Summit Midstream Holdings, LLC Senior Notes Co-Issuer, Not a guarantor Summit Midstream Finance Corp. Senior Notes Co-Issuer, Not a guarantor Summit Midstream Partners, LP Senior Notes Joint and Several, Fully and Unconditionally Grand River Gathering, LLC Senior Notes Joint and Several, Fully and Unconditionally Red Rock Gathering Company, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit Midstream Niobrara, LLC Senior Notes Joint and Several, Fully and Unconditionally DFW Midstream Services LLC Senior Notes Joint and Several, Fully and Unconditionally Polar Midstream, LLC Senior Notes Joint and Several, Fully and Unconditionally Epping Transmission Company, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit Midstream Marketing, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit Midstream Permian II, LLC Senior Notes Joint and Several, Fully and Unconditionally Mountaineer Midstream Company, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit Midstream OpCo, LP Senior Notes Joint and Several, Fully and Unconditionally Meadowlark Midstream Company, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit Midstream Utica, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit DJ-O, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit DJ-S, LLC Senior Notes Joint and Several, Fully and Unconditionally Summit DJ-O Operating, LLC Senior Notes Joint and Several, Fully and Unconditionally Grasslands Energy Marketing LLC Senior Notes Joint and Several, Fully and Unconditionally SUMMIT MIDSTREAM PARTNERS, LP SUBSIDIARY ISSUERS AND GUARANTORS OF REGISTERED SECURITIES The below chart lists the subsidiary co-issuers and guarantors of the 5.75% senior notes due 2025 (the "Senior Notes").

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos., 333-249831 on Form S-1, No. 333-234781 on Form S-3 and Nos. 333-184214, 333-189684, 333-237323 and 333-265857 on Form S-8 of our reports dated March 15, 2024, relating to the consolidated financial statements of Summit Midstream Partners, LP (the “Partnership”), and the effectiveness of the Partnership's internal control over financial reporting, appearing in this Annual Report on Form 10-K of Summit Midstream Partners, LP for the year ended December 31, 2023.

/s/ Deloitte & Touche, LLP

Houston, Texas

March 15, 2024

EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, Heath Deneke, certify that:

1.I have reviewed this annual report on Form 10-K 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	March 15, 2024	/s/ Heath Deneke
		Heath Deneke
		President, Chief Executive Officer and Director of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, William J. Mault, certify that:

1.I have reviewed this annual report on Form 10-K 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	March 15, 2024	/s/ William J. Mault
		William J. Mault
		Executive Vice President and Chief Financial Officer of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report on Form 10-K of Summit Midstream Partners, LP (the “Registrant”) for the annual period ended December 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Heath Deneke, as President, Chief Executive Officer and Director of Summit Midstream GP, LLC, the general partner of the Registrant, and William J. Mault, as Executive 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/ Heath Deneke
Name:	Heath Deneke
Title:	President, Chief Executive Officer and Director of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)
Date:	March 15, 2024
/s/ William J. Mault
Name:	William J. Mault
Title:	Executive Vice President and Chief Financial Officer of Summit Midstream GP, LLC (the general partner of Summit Midstream Partners, LP)
Date:	March 15, 2024

EX 32.1-1

EX-97.1

SUMMIT MIDSTREAM PARTNERS, LP

POLICY FOR THE RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION

1.Purpose. The purpose of this Policy is to describe circumstances in which the Company will recover Erroneously Awarded Compensation and the process for such recovery. This Policy is intended to comply with (a) Section 954 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, as codified in Section 10D of the Exchange Act, and implemented by Rule 10D-1 thereunder adopted by the Commission and (b) Section 303A.14 of the Listed Company Manual of the NYSE.

2.Administration. This Policy shall be administered by the Compensation Committee. Any determinations made by the Compensation Committee shall be final and binding on all affected individuals.

3.Definitions. For purposes of this Policy, the following capitalized terms shall have the meanings set forth below.

a.“Audit Committee” means the Audit Committee of the Board.

b.“Board” means the Board of Directors of Summit Midstream GP, LLC, a Delaware limited liability company and the general partner of the Company.

c.“Commission” means the United States Securities and Exchange Commission.

d.“Company” means Summit Midstream Partners, LP, a Delaware limited partnership.

e.“Compensation Committee” means the Compensation Committee of the Board.

f.“Compensation Eligible for Recovery” means Incentive-based Compensation received by an individual:

i.after beginning service as an Executive Officer,

ii.who served as an Executive Officer at any time during the performance period for the applicable Incentive-based Compensation (regardless of whether such individual is serving as an Executive Officer at the time the Erroneously Awarded Compensation is required to be repaid to the Company),

iii. while the Company had a class of securities listed on a national securities exchange or a national securities association,

iv. during the applicable Recovery Period, and

v. after the Effective Date.

g.“Effective Date” means October 2, 2023.

1    

h.“Erroneously Awarded Compensation” means the Compensation Eligible for Recovery less the amount of such compensation as it would have been determined based on the restated amounts, computed without regard to any taxes paid.

i.“Exchange Act” means the Securities Exchange Act of 1934, as amended.

j.“Executive Officer” means the Company’s principal executive officer, principal financial officer, principal accounting officer (or if there is no such accounting officer, the controller), any vice president of the Company in charge of a principal business unit, division, or function (such as sales, administration or finance) and any other officer who performs a significant policy-making function, and any other person who performs similar policy-making functions for the Company. For purposes of this policy, Executive Officers would include, at a minimum, executive officers identified pursuant to 17 C.F.R. 229.401(b).

k.“Financial Reporting Measure” means measures that are determined and presented in accordance with the accounting principles used in preparing the Company’s financial statements, and any measures that are derived wholly or in part from such measures. Stock price and total shareholder return are considered Financial Reporting Measures. For the avoidance of doubt, a Financial Reporting Measure need not be presented within the financial statements or included in a filing with the Commission.

l.“Incentive-based Compensation” means any compensation that is granted, earned, or vested based wholly or in part upon the attainment of a Financial Reporting Measure.

m.“NYSE” means the New York Stock Exchange LLC.

n.“Policy” means this Policy for the Recovery of Erroneously Awarded Compensation, as the same may be amended or amended and restated from time to time.

o.“Recovery Period” means the three completed fiscal years immediately preceding the Restatement Date and any transition period (that results from a change in the Company’s fiscal year) of less than nine months within or immediately following those three completed fiscal years.

p.“Restatement” means an accounting restatement:

i.due to material noncompliance of the Company with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously issued financial statements that is material to the previously issued financial statements, or

ii.that would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

q.“Restatement Date” means the earlier of:

2    

i.the date the Audit Committee concludes, or reasonably should have concluded, that the Company is required to prepare a Restatement, or

ii.the date a court, regulator, or other legally authorized body directs the Company to prepare a Restatement.

4.Recovery of Erroneously Awarded Compensation.

a.The Chief Financial Officer or Chief Accounting Officer of the Company shall promptly report to the Audit Committee any instance in which the Company is required to prepare a Restatement.

b.Upon learning of a required Restatement, the Audit Committee shall determine the Restatement Date and shall promptly report to the Compensation Committee such determination.

c.The Chief Financial Officer or Chief Accounting Officer (or another appropriate officer or third party designated by the Compensation Committee) shall promptly (but in any event within 90 days following the Restatement) calculate the Erroneously Awarded Compensation for each affected individual, which calculation shall be subject to Compensation Committee approval. For purposes of calculating Erroneously Awarded Compensation:

i.Incentive-based Compensation shall be deemed received in the Company’s fiscal period during which the Financial Reporting Measure specified in the Incentive-based Compensation award is attained, even if the payment or grant of the Incentive-based Compensation occurs after the end of that period.

ii.Incentive-based Compensation based on (or derived from) stock price or total shareholder return, where the amount of Erroneously Awarded Compensation is not subject to mathematical recalculation directly from the information in a Restatement, shall be based on a reasonable estimate of the effect of the Restatement on the stock price or total shareholder return upon which the Incentive-based Compensation was received. The Secretary of the Company or their designee shall maintain documentation of the determination of such reasonable estimate and provide such documentation to the NYSE.

d.Promptly following the Compensation Committee’s approval of the Erroneously Awarded Compensation calculated by the Chief Financial Officer or Chief Accounting Officer (or another appropriate officer or third party designated by the Compensation Committee), the Secretary of the Company or their designee shall notify in writing each individual who received Erroneously Awarded Compensation of the amount of Erroneously Awarded Compensation received by such individual and shall demand payment or return, as applicable, of such Erroneously Award Compensation.

e.The Secretary of the Company or their designee shall demand recovery and recover Erroneously Awarded Compensation in compliance with this Policy except to the extent that the Compensation Committee determines that (I) recovery of the Erroneously Awarded Compensation would be duplicative of compensation recovered by the Company from the individual pursuant to Section

3    

304 of the Sarbanes-Oxley Act or pursuant to other recovery obligations (in which case, the amount of Erroneously Awarded Compensation shall be appropriately reduced to avoid such duplication), or (II) recovery would be impracticable, and one of the following conditions applies:

i.the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered. Before concluding that it would be impracticable to recover any amount of Erroneously Awarded Compensation based on expense of enforcement, the Company must make a reasonable attempt to recover such Erroneously Awarded Compensation, document such reasonable attempt(s) to recover, and provide that documentation to the NYSE;

ii.recovery would violate home country law where that law was adopted prior to November 28, 2022. Before concluding that it would be impracticable to recover any amount of Erroneously Awarded Compensation based on violation of home country law, the Company must obtain an opinion of home country counsel, acceptable to the NYSE, that recovery would result in such a violation, and must provide such opinion to the NYSE; or

iii. recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the Company, to fail to meet the requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and regulations thereunder.

f.Except as provided in Section 4(e), in no event may the Company accept repayment from the affected individual of less than the full amount of the Erroneously Awarded Compensation received by such individual.

g.The Compensation Committee shall determine, in its sole discretion, the method of recovering any Erroneously Awarded Compensation pursuant to this Policy, taking into account all facts and circumstances (including the time value of money and the cost to shareholders of delayed recovery), so long as such method complies with the terms of Section 303A.14 of the NYSE Listing Standards.

h.If the affected individual fails to repay to the Company when due the full amount of the Erroneously Awarded Compensation received by such affected individual, the Company shall take all actions reasonable and appropriate to recover the full amount of the Erroneously Awarded Compensation from the affected individual.

5.Disclosure. The Company shall file all disclosures with respect to this Policy in accordance with the requirements of the securities laws, including the disclosure required by the applicable Commission filings.

6.No Indemnification. The Company shall not indemnify any current or former Executive Officer against the loss of Erroneously Awarded Compensation, and shall not pay, or reimburse any current or former Executive Officers for premiums for any insurance policy to fund such Executive Officer’s potential recovery obligations.

7.Effective Date. This Policy shall be effective as of the Effective Date.

4    

8.Amendment and Interpretation. The Compensation Committee may amend this Policy from time to time in its discretion and shall amend this Policy as it deems necessary or advisable to reflect the regulations adopted by the Commission and to comply with any rules or standards adopted by the NYSE. The Compensation Committee may at any time in its sole discretion, supplement, amend or terminate any provision of this Policy in any respect as the Compensation Committee determines to be necessary or appropriate. The Compensation Committee shall interpret and construe this Policy and make all determinations necessary or advisable for the administration of this Policy. It is intended that this Policy be interpreted in a manner that is consistent with the requirements of Section 10D of the Exchange Act and Rule 10D-1 thereunder and Section 303A.14 of the NYSE Listed Company Manual and any other applicable rules adopted by the Commission.

9.Other Recoupment Rights. The Compensation Committee intends that this Policy will be applied to the fullest extent of the law. The Compensation Committee may require that any employment agreement, equity award agreement or similar agreement entered into on or after the Effective Date shall, as a condition to the grant of any benefit thereunder, require the party thereto to agree to abide by the terms of this Policy or implement arrangements designed to facilitate the administration hereof. Any right of recovery under this Policy is in addition to, and not in lieu of, any other remedies or rights of recovery that may be available to the Company pursuant to the terms of any employment agreement, equity award agreement, or similar agreement and any other legal remedies available to the Company.

10.Successors. This Policy shall be binding and enforceable against all current and former Executive Officers and their beneficiaries, heirs, executors, administrators or other legal representatives.

5    

XML

COVER PAGE - USD ($)

12 Months Ended

Dec. 31, 2023

Mar. 01, 2024

Jun. 30, 2023

Cover [Abstract]

Document Type

10-K

Document Annual Report

true

Document Period End Date

Dec. 31, 2023

Current Fiscal Year End Date

--12-31

Document Transition Report

false

Entity File Number

001-35666

Entity Registrant Name

Summit Midstream Partners, LP

Entity Incorporation, State or Country Code

DE

Entity Tax Identification Number

45-5200503

Entity Address, Address Line One

910 Louisiana Street

Entity Address, Address Line Two

Suite 4200

Entity Address, City or Town

Houston

Entity Address, State or Province

TX

Entity Address, Postal Zip Code

77002

City Area Code

832

Local Phone Number

413-4770

Title of 12(b) Security

Common Units

Trading Symbol

SMLP

Security Exchange Name

NYSE

Entity Well-known Seasoned Issuer

No

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Accelerated Filer

Entity Small Business

true

Entity Emerging Growth Company

false

ICFR Auditor Attestation Flag

true

Document Financial Statement Error Correction

false

Entity Shell Company

false

Entity Public Float

$ 168,613,071

Entity Common Stock, Shares Outstanding

10,415,675

Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement relating to its 2024 Annual Meeting of Limited Partners, which will be filed with the Securities and Exchange Commission within 120 days of December 31, 2023, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

Entity Central Index Key

0001549922

Amendment Flag

false

Document Fiscal Year Focus

2023

Document Fiscal Period Focus

FY

XML

AUDIT INFORMATION	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	Deloitte & Touche LLP
Auditor Location	Houston, Texas
Auditor Firm ID	34

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 14,044	$ 11,808
Restricted cash	2,601	1,723
Accounts receivable	76,275	75,287
Other current assets	5,502	8,724
Total current assets	98,422	97,542
Property, plant and equipment, net	1,698,585	1,718,754
Intangible assets, net	175,592	198,718
Investment in equity method investees	486,434	506,677
Other noncurrent assets	35,165	38,273
TOTAL ASSETS	2,494,198	2,559,964
LIABILITIES AND CAPITAL
Trade accounts payable	22,714	14,052
Accrued expenses	32,377	20,601
Deferred revenue	10,196	9,054
Ad valorem taxes payable	8,543	10,245
Accrued compensation and employee benefits	6,815	16,319
Accrued interest	19,298	17,355
Accrued environmental remediation	1,483	1,365
Accrued settlement payable	6,667	6,667
Current portion of long-term debt	15,524	10,507
Other current liabilities	10,395	11,724
Total current liabilities	134,012	117,889
Long-term debt, net	1,455,166	1,479,855
Noncurrent deferred revenue	30,085	37,694
Noncurrent accrued environmental remediation	1,454	2,340
Other noncurrent liabilities	30,266	38,784
Total liabilities	1,650,983	1,676,562
Commitments and contingencies (Note 10)
Mezzanine Capital
Subsidiary Series A Preferred Units (93,039 units issued and outstanding at December 31, 2023 and December 31, 2022)	124,652	118,584
Partners Capital
Series A Preferred Units (65,508 units issued and outstanding at December 31, 2023 and December 31, 2022)	96,893	85,327
Common limited partner capital (10,376,189 and 10,182,763 units issued and outstanding at December 31, 2023 and December 31, 2022, respectively)	621,670	679,491
Total partners capital	718,563	764,818
TOTAL LIABILITIES AND CAPITAL	$ 2,494,198	$ 2,559,964

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Dec. 31, 2023	Dec. 31, 2022
Partners Capital
Common limited partner capital, issued (in shares)	10,376,189	10,182,763
Common limited partner capital, outstanding (in shares)	10,376,189	10,182,763
Subsidiary Series A Preferred Units
Subsidiary Series A preferred unitholders, issued (in shares)	93,039,000
Subsidiary Series A preferred unitholders, outstanding (in shares)	93,039,000
Series A Preferred Units
Subsidiary Series A preferred unitholders, issued (in shares)	65,508
Subsidiary Series A preferred unitholders, outstanding (in shares)	65,508

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	$ 458,903	$ 369,594
Costs and expenses:
Type of Cost, Good or Service [Extensible List]	Natural Gas Liquids [Member]	Natural Gas Liquids [Member]
Cost of natural gas and NGLs	$ 112,462	$ 76,826
Operation and maintenance	100,741	84,152
General and administrative	42,135	44,943
Depreciation and amortization	122,764	119,055
Transaction costs	1,251	6,968
Acquisition integration costs	2,654	0
Gain on asset sales, net	(260)	(507)
Long-lived asset impairment	540	91,644
Total costs and expenses	382,287	423,081
Other income (expense), net	865	(4)
Gain on interest rate swaps	1,830	16,414
Loss on sale of business	(47)	(1,741)
Interest expense	(140,784)	(102,459)
Loss on early extinguishment of debt	(10,934)	0
Loss before income taxes and equity method investment income	(72,454)	(141,277)
Income tax expense	(322)	(325)
Income from equity method investees	33,829	18,141
Net loss	(38,947)	(123,461)
Net loss attributable to Summit Midstream Partners, LP	(51,528)	(140,605)
Parent Company
Costs and expenses:
Add: deemed capital contribution	0	20,974
Series A Preferred Units | Subsidiary
Costs and expenses:
Less: Net income attributable to Subsidiary Series A Preferred Units	(12,581)	(17,144)
Series A Preferred Units | Parent Company
Costs and expenses:
Less: Net income attributable to Subsidiary Series A Preferred Units	(11,566)	(8,048)
Common units
Costs and expenses:
Net income (loss) attributable to limited partners	$ (63,094)	$ (127,679)
Net loss per limited partner unit:
Common unit - basic (in dollars per share)	$ (6.11)	$ (12.71)
Common unit - diluted (in dollars per share)	$ (6.11)	$ (12.71)
Weighted-average limited partner units outstanding:
Common units - basic (in shares)	10,334	10,048
Common units - diluted (shares)	10,334	10,048
Gathering services and related fees
Revenues:
Total revenues	$ 248,223	$ 248,358
Natural gas, NGLs and condensate sales
Revenues:
Total revenues	179,254	86,225
Other revenues
Revenues:
Total revenues	$ 31,426	$ 35,011

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CONSOLIDATED STATEMENTS OF PARTNERS CAPITAL - USD ($) $ in Thousands	Total	Partners Capital	Partners Capital Series A Preferred Units
Beginning balance at Dec. 31, 2021	$ 904,363	$ 734,594	$ 169,769
Partners' Capital [Roll Forward]
Net income (loss)	(140,598)	(148,743)	8,145
Unit-based compensation	3,778	3,778	0
Tax withholdings and associated payments on vested SMLP LTIP awards	(1,198)	(1,198)	0
Tax withholdings on 2022 Preferred Exchange Offer	(2,652)	(2,652)	0
LTIP cash to equity conversion	1,125	1,125	0
Effect of 2022 Preferred Exchange Offer, inclusive of a $20.9 million deemed contribution to common unit holders	0	92,587	(92,587)
Ending balance at Dec. 31, 2022	764,818	679,491	85,327
Partners' Capital [Roll Forward]
Net income (loss)	(51,528)	(63,094)	11,566
Unit-based compensation	6,566	6,566	0
Tax withholdings and associated payments on vested SMLP LTIP awards	(1,293)	(1,293)	0
Ending balance at Dec. 31, 2023	$ 718,563	$ 621,670	$ 96,893

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CONSOLIDATED STATEMENTS OF PARTNERS CAPITAL (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Statement of Partners' Capital [Abstract]
Deemed contribution to common unit holders	$ 20.9

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (38,947)	$ (123,461)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	123,702	119,993
Noncash lease expense	3,773	885
Amortization of debt issuance costs	12,685	9,326
Unit-based and noncash compensation	6,566	3,778
Income from equity method investees	(33,829)	(18,141)
Distributions from equity method investees	57,572	43,040
Gain on asset sales, net	(260)	(507)
Foreign currency gain	(102)	0
Loss on earn-out	599	0
Loss on sale of business	47	1,741
Loss on extinguishment of debt	10,934	0
Unrealized (gain) loss on interest rate swaps	3,318	(16,016)
Long-lived asset impairment	540	91,644
Changes in operating assets and liabilities:
Accounts receivable	(3,352)	284
Trade accounts payable	4,483	2,248
Accrued expenses	5,586	(2,780)
Deferred revenue	(6,467)	(6,082)
Ad valorem taxes payable	(1,702)	14
Accrued interest	1,943	4,618
Accrued environmental remediation, net	(768)	(1,901)
Other, net	(19,415)	(9,939)
Net cash provided by operating activities	126,906	98,744
Cash flows from investing activities:
Capital expenditures	(68,905)	(30,472)
Proceeds from asset sale	260	4,945
Investment in Double E equity method investee	(3,500)	(8,444)
Other, net	(2,611)	0
Net cash used in investing activities	(74,756)	(226,558)
Cash flows from financing activities:
Borrowings on 2026 Unsecured Notes	29,480	0
Repurchase of 2025 Senior Notes	(29,650)	0
Borrowings on 2026 Secured Notes	0	84,371
Repayments on Permian Transmission Term Loan	(10,507)	(4,647)
Borrowings on ABL Facility	70,000	293,000
Repayments on ABL Facility	(87,000)	(230,000)
Debt issuance costs	(2,968)	(14,409)
Payment for Debt Extinguishment or Debt Prepayment Cost	10,306	0
Distributions on Subsidiary Series A Preferred Units	(6,512)	(3,257)
Other, net	(1,573)	(3,285)
Net cash provided by financing activities	(49,036)	121,773
Net change in cash, cash equivalents and restricted cash	3,114	(6,041)
Cash, cash equivalents and restricted cash, beginning of period	13,531	19,572
Cash, cash equivalents and restricted cash, end of period	16,645	13,531
Lane G&P System
Cash flows from investing activities:
Proceeds from sale of business, net of cash sold in transaction	0	75,020
Bison Midstream, LLC
Cash flows from investing activities:
Proceeds from sale of business, net of cash sold in transaction	0	38,920
Outrigger DJ
Cash flows from investing activities:
Cash consideration paid for the acquisition, net of cash acquired	0	(166,631)
Sterling DJ
Cash flows from investing activities:
Cash consideration paid for the acquisition, net of cash acquired	$ 0	$ (139,896)

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ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

1. ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

Organization. Summit Midstream Partners, LP (including its subsidiaries, collectively “SMLP” or the “Partnership”) is a Delaware limited partnership that was formed in May 2012 and began operations in October 2012. SMLP is a value-oriented limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States. The Partnership’s business activities are primarily conducted through various operating subsidiaries, each of which is owned or controlled by its wholly owned subsidiary holding company, Summit Holdings, a Delaware limited liability company. As of December 31, 2023, the Partnership indirectly owns its General Partner, and the General Partner is a wholly owned, indirect subsidiary of the Partnership. The General Partner has no assets or liabilities and holds the non-economic general partner interest in the Partnership.

Business Operations. The Partnership provides natural gas gathering, compression, treating and processing services as well as crude oil and produced water gathering services pursuant to primarily long-term, fee-based agreements with its customers. In addition to these services, the Partnership also provides freshwater delivery services pursuant to short-term agreements with customers. The Partnership’s results are primarily driven by the volumes of natural gas that it gathers, compresses, treats and/or processes as well as by the volumes of crude oil and produced water that it gathers. Other than the Partnership’s investments in Double E and Ohio Gathering, all of its business activities are conducted through wholly owned operating subsidiaries.

Presentation and Consolidation. The Partnership prepares its consolidated financial statements in accordance with GAAP as established by the FASB. The Partnership makes 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 revenues and expenses and the disclosure of commitments and contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.

The consolidated financial statements include the assets, liabilities and results of operations of SMLP and its subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. Comprehensive income or loss is the same as net income or loss for all periods presented.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP

Cash, Cash Equivalents and Restricted Cash. The Partnership considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. Cash that is held by a major bank and has restrictions on its availability to the Partnership is classified as restricted cash. The restricted cash balance of $2.6 million and $1.7 million at December 31, 2023 and 2022, respectively, is related to proceeds which are available to finance Permian Transmission’s debt service or other general corporate purposes of Permian Transmission. See Note 9 - Debt for additional information.

Accounts Receivable. Accounts receivable relate to gathering and other services provided to the Partnership’s customers and other counterparties. The Partnership evaluates the collectability of its accounts receivable and the need for an allowance for doubtful accounts based on customer-specific facts and circumstances. To the extent the collectability of a specific customer or counterparty receivable is doubtful, the Partnership recognizes an allowance for doubtful accounts. Uncollectible receivables are written off when a settlement is reached for an amount that is less than the outstanding historical balance or a receivable amount is deemed otherwise unrealizable.

Property, Plant and Equipment. The Partnership records property, plant and equipment at historical cost of construction or fair value of the assets at acquisition. The Partnership capitalizes expenditures that extend the useful life of an asset or enhance its productivity or efficiency from its original design over the expected remaining period of use. For maintenance and repairs that do not add capacity or extend the useful life of an asset, the Partnership recognizes expenditures as an expense as incurred. The Partnership capitalizes project costs incurred during construction, including interest on funds borrowed to finance the construction of facilities and pipelines, as construction in progress. Accrued capital expenditures are reflected in trade accounts payable.

The Partnership records depreciation on a straight-line basis over an asset’s estimated useful life and bases its estimates for useful life on various factors including age (in the case of acquired assets), manufacturing specifications, technological advances and historical data concerning useful lives of similar assets. Estimates of useful lives follow.

	Useful lives (In years)
Gathering and processing systems and related equipment	12-30
Other	3-15

Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Land and line fill are not depreciated.

The Partnership bases an asset’s carrying value on estimates, assumptions and judgments for useful life and salvage value. Upon sale, retirement or other disposal, the Partnership removes the carrying value of an asset and its accumulated depreciation from its balance sheet and recognizes the related gain or loss, if any.

Asset Retirement Obligations. The Partnership records a liability for asset retirement obligations only if and when a future asset retirement obligation with a determinable life is identified. For identified asset retirement obligations, the Partnership evaluates whether the expected retirement date and related costs of retirement can be estimated. The Partnership has concluded that its gathering and processing assets have an indeterminate life because they are owned and will operate for an indeterminate period when properly maintained. Because the Partnership does not have sufficient information to reasonably estimate the amount or timing of such obligations and does not have any current plan to discontinue use of any significant assets, the Partnership did not provide for any asset retirement obligations as of December 31, 2023 or 2022.

Amortizing Intangibles. The Partnership has certain acquired gas gathering contracts that had above-market pricing structures at the acquisition date and the Partnership amortizes these favorable contracts using a straight-line method over the contract’s estimated useful life. The Partnership defines useful life as the period over which the contract is expected to contribute to the Partnership’s future cash flows. These favorable contracts have original terms ranging from 10 years to 20 years and the Partnership recognizes the amortization expense associated with these contracts in Other revenues.

The Partnership amortizes all other gas gathering contracts, or contract intangibles, over the period of economic benefit based upon expected revenues over the life of the contract. The useful life of these contracts ranges from 3 years to 25 years. The Partnership recognizes the amortization expense associated with these contracts in Depreciation and amortization expense.

The Partnership also has rights-of-way associated with municipal easements and easements granted within existing rights-of-way. The Partnership amortizes these intangible assets over the shorter of the contractual term of the rights-of-way or the estimated useful life of the gathering system. The contractual terms of the rights-of-way range from 20 years to 30 years and the Partnership recognizes the amortization expense associated with these rights-of-way assets in Depreciation and amortization expense.

Equity Method Investments. The Partnership accounts for investments in which it exercises significant influence using the equity method so long as it (i) does not control the investee and (ii) is not the primary beneficiary. The Partnership reflects these investments in its consolidated balance sheets under the caption titled “investment in equity method investees.”

The Partnership recognizes an other-than-temporary impairment for losses in the value of equity method investees when evidence indicates that the carrying amount is no longer supportable. Evidence of a loss in value might include, but is not limited to, absence of an ability to recover the carrying amount of the investment or an inability of the equity method investee to sustain an earnings capacity that would justify the carrying amount of the investment. A current fair value of an investment that is less than its carrying amount may indicate a loss in value of the investment. The Partnership evaluates its equity method investments for impairment whenever a triggering event exists that would indicate a need to assess the investment for potential impairment.

Impairment of Long-Lived Assets. The Partnership tests assets for impairment when events or circumstances indicate the carrying value of a long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If the Partnership concludes that an asset’s carrying value will not be recovered through future cash flows, the Partnership recognizes an impairment loss on the long-lived asset equal to the amount by which the carrying value exceeds its fair value. The Partnership determines fair value using a combination of market-based and income-based approaches.

Environmental Matters. The Partnership is subject to various federal, state and local laws and regulations relating to the protection of the environment. 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. The Partnership accrues

for losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Such accruals are adjusted as further information develops or circumstances change. Recoveries of environmental remediation costs from other parties or insurers are recorded as assets when their realization is assured beyond a reasonable doubt.

Commitments and Contingencies. When required, the Partnership records accruals for loss contingencies in accordance with FASB ASC 450, Contingencies. Such determinations are subject to interpretations of current facts and circumstances, forecasts of future events and estimates of the financial impacts of such events.

Mezzanine Capital. A noncontrolling interest is reported as a component of equity unless the noncontrolling interest is considered redeemable, in which case the noncontrolling interest is recorded between liabilities and equity (mezzanine or temporary equity) in the Partnership’s consolidated balance sheet.

Revenue. The Partnership provides gathering and/or processing services principally under contracts that contain one or more of the following arrangements described below:

•Fee-based arrangements. Under fee-based arrangements, the Partnership receives a fee or fees for one or more of the following services (i) natural gas gathering, treating, transporting, compressing and/or processing and (ii) crude oil and/or produced water gathering and (iii) fresh water delivery services.

•Percent-of-proceeds arrangements. Under percent-of-proceeds arrangements, the Partnership generally purchases natural gas from producers at the wellhead, or other receipt points, gathers the wellhead natural gas through its gathering system, treats and compresses the natural gas, processes the natural gas and/or sells the natural gas to a third party for processing. The Partnership then remits to its producers an agreed-upon percentage of the actual proceeds received from sales of the residue natural gas and NGLs. Certain of these arrangements may also result in returning all or a portion of the residue natural gas and/or the NGLs to the producer, in lieu of returning sales proceeds. The margins earned are directly related to the volume of natural gas that flows through the system and the price at which the Partnership is able to sell the residue natural gas and NGLs.

The majority of the Partnership’s contracts have a single performance obligation which is either to provide gathering services (an integrated service) or sell natural gas, NGLs and condensate, which are both satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. The Partnership also has certain contracts with multiple performance obligations. They include an option for the customer to acquire additional services such as contracts containing MVCs. These performance obligations would also be satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. In these instances, the Partnership allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each service in the contract.

Performance obligations for gathering services are generally satisfied over time. The Partnership utilizes either an output method (i.e., measure of progress) for guaranteed, stand-ready service contracts or an asset/system delivery time estimate for non-guaranteed, as-available service contracts.

Performance obligations for the sale of natural gas, NGLs and condensate are satisfied at a point in time. There are no significant judgments for these transactions because the customer obtains control based on an agreed upon delivery point.

Services are typically billed on a monthly basis and the Partnership does not offer extended payment terms. The Partnership does not have contracts with financing components.

For the contracts described above, the Partnership reflects its revenues in the financial statement captions described below.

Financial statement caption:	Revenue description:
Revenues:
Gathering services and related fees	•Revenue earned from fee-based gathering, compression, treating and processing services;
Natural gas, NGLs and condensate sales	•Revenue from the sale of physical natural gas purchased from customers percent-of- proceeds arrangements (Costs are presented within cost of natural gas and NGLs); •Revenue from sale of condensate and NGLs retained from gathering services (Costs are presented within operation and maintenance expense);
Other revenues	•Reimbursements to the Partnership for costs incurred by the Partnership on customer’s behalf (Recorded on a gross basis with corresponding costs included in operations and maintenance expense); •Revenue for freshwater deliveries; •Contract amortization; and •Revenue for management fees related to Double E.

Certain of the Partnership’s gathering and/or processing agreements provide for monthly MVCs. Under these MVCs, customers agree to ship and/or process a minimum volume of production on its 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 the Partnership at the end of the contracted measurement period if its actual throughput volumes are less than its contractual MVC for that period. Certain customers are entitled to utilize shortfall payments to offset gathering fees in one or more subsequent contracted measurement periods to the extent that such customers throughput volumes in a subsequent contracted measurement period exceed its MVC for that contracted measurement period. The amount of the shortfall payment is based on the difference between the actual throughput volume shipped and/or processed for the applicable period and the MVC for the applicable period, multiplied by the applicable gathering or processing fee.

Many of the Partnership’s gas gathering agreements contain provisions that can reduce or delay the cash flows that it expects to receive from MVCs to the extent that a customer's actual throughput volumes are above or below its MVC for the applicable contracted measurement period. These provisions include the following: 

•To the extent that a customer's throughput volumes are less than its MVC for the applicable period and the customer makes a shortfall payment, it may be entitled to an offset in one or more subsequent periods to the extent that its throughput volumes in subsequent periods exceed its MVC for those periods. In such a situation, the Partnership would not receive gathering fees on throughput in excess of that customer's MVC (depending on the terms of the specific gas gathering agreement) to the extent that the customer had made a shortfall payment with respect to one or more preceding measurement periods (as applicable).

•To the extent that a customer's throughput volumes exceed its MVC in the applicable contracted measurement period, it may be entitled to apply the excess throughput against its aggregate MVC, thereby reducing the period for which its annual MVC applies. As a result of this mechanism, the weighted-average remaining period for which the Partnership’s MVCs apply will be less than the weighted-average of the originally stated MVC contractual terms.

•To the extent that certain of the Partnership’s customers' throughput volumes exceed its MVC for the applicable period, there is a crediting mechanism that allows the customer to build a bank of credits that it can utilize in the future to reduce shortfall payments owed in subsequent periods, subject to expiration if there is no shortfall in subsequent periods. The period over which this credit bank can be applied to future shortfall payments varies, depending on the particular gas gathering agreement.

The Partnership recognizes customer obligations under their MVCs as revenue and contract assets when (i) it considers it remote that the customer will utilize shortfall payments to offset gathering or processing fees in excess of its MVCs in subsequent periods; (ii) the customer incurs a shortfall in a contract with no banking mechanism or claw back provision; (iii) the customer’s banking mechanism has expired; or (iv) it is remote that the customer will use its unexercised right. In making

this determination, the Partnership considers both quantitative and qualitative facts and circumstances, including, but not limited to, contract terms, capacity of the associated pipeline or receipt point and/or expectations regarding future investment, drilling and production.

The majority of the Partnership’s revenue is derived from long-term, fee-based contracts with its customers, which include original terms of up to 25 years. The Partnership recognizes revenue earned from fee-based gathering, compression, treating and processing services in gathering services and related fees. The Partnership also earns revenue in the Rockies and Piceance reporting segments from the sale of physical natural gas purchased from its customers under certain percent-of-proceeds arrangements. Under ASC Topic 606, these gathering contracts are presented net within cost of natural gas and NGLs. The Partnership sells natural gas that it retains from certain customers in the Barnett reporting segment to offset the power expenses, included in operations and maintenance expense, of the electric-driven compression on the gathering system. The Partnership also sells condensate and NGLs retained from certain of its gathering services in the Piceance and Rockies reporting segments. Revenues from the sale of natural gas and condensate are recognized in Natural gas, NGLs and condensate sales; the associated expense is included in Operation and maintenance expense. Certain customers reimburse the Partnership for costs incurred on their behalf. The Partnership records costs incurred and reimbursed by its customers on a gross basis, with the revenue component recognized in Other revenues and the associated expense included in operations and maintenance expense.

The transaction price in the Partnership’s contracts is primarily based on the volume of natural gas, crude oil or produced water transferred by its gathering systems to the customer’s agreed upon delivery point multiplied by the contractual rate. For contracts that include MVCs, variable consideration up to the MVC will be included in the transaction price. For contracts that do not include MVCs, the Partnership does not estimate variable consideration because the performance obligations are completed and settled on a daily basis. For contracts containing noncash consideration such as fuel received in-kind, the Partnership measures the transaction price at the point of sale when the volume, mix and market price of the commodities are known.

The Partnership has contracts with MVCs that are variable and constrained. Contracts with longer than monthly MVCs are reviewed on a quarterly basis and adjustments to those estimates are made during each respective reporting period, if necessary.

The transaction price is allocated if the contract contains more than one performance obligation such as contracts that include MVCs. The transaction price allocated is based on the MVC for the applicable measurement period.

Unit-Based Compensation. For awards of unit-based compensation, the Partnership determines a grant date fair value and recognizes the related compensation expense in the statements of operations over the vesting period for each respective award.

Income Taxes. The Partnership is generally not subject to federal and state income taxes, except as noted below. However, its unitholders are individually responsible for paying federal and state income taxes on their share of its taxable income. Net income or loss for GAAP purposes may differ significantly from taxable income reportable to its unitholders as a result of differences between the tax basis and the GAAP basis of assets and liabilities and the taxable income allocation requirements of the Partnership’s governing documents. The aggregate difference in the basis of the Partnership’s net assets for financial and income tax purposes cannot be readily determined as the Partnership does not have access to the information about each partner’s tax attributes related to the Partnership.

In general, legal entities that are chartered, organized or conducting business in the state of Texas are subject to a 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. The Partnership’s financial statements reflect provisions for these tax obligations.

Interest Rate Swaps. Interest rate swap agreements are reported as either assets or liabilities on the consolidated balance sheet at fair value. Interest rate swap agreements are not designated as cash-flow hedges, and accordingly, the changes in the fair value are recorded in earnings. The Partnership does not use interest rate swap agreements for speculative purposes.

Accounting standards recently implemented. ASU No. 2020-4 Reference Rate Reform (“ASU 2020-4”). ASU 2020-4 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform on financial reporting. Contract terms that are modified due to the replacement of a reference rate are not required to be remeasured or reassessed under relevant accounting standards. During the quarter ended June 30, 2023, the Partnership amended the terms of its Permian Transmission Credit Facility and Term Loan and interest rate swaps, which replaced its existing LIBOR based terms with SOFR rate terms. The amendments in ASU 2020-4 are effective as of March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU 2022-06, which amended Topic 848 to defer the sunset date to apply the practical expedients until December 31, 2024. The impact of the change in reference rate did not have a material impact on the Partnership’s consolidated financial statements. See Note 9 - Debt, for additional information.

New accounting standards not yet implemented in this Annual Report. ASU No. 2020-06 Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815 – 40) (“ASU 2020-06”). ASU 2020-06 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The ASU is part of the FASB’s simplification initiative, which aims to reduce unnecessary complexity in GAAP. The ASU’s amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. The Partnership does not expect the provisions of ASU 2020-06 will have a material impact on its consolidated financial statements and disclosures.

ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 enhances disclosures on reportable segments and provides additional detailed information about significant segment expenses. The guidance in ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Partnership continues to assess the impact of the new guidance, but does not expect the provisions of ASU 2023-07 will have a material impact on its consolidated financial statements and disclosures.

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ACQUISTIONS AND DIVESTITURES

12 Months Ended

Dec. 31, 2023

Business Combination and Asset Acquisition [Abstract]

ACQUISTIONS AND DIVESTITURES

3. ACQUISTIONS AND DIVESTITURES

Acquisition of Outrigger DJ. On December 1, 2022, the Partnership completed the acquisition of 100% of the equity interests of Outrigger DJ Midstream LLC (“Outrigger DJ”) from Outrigger Energy II LLC for cash consideration of $165.0 million, subject to customary working capital adjustments. The acquisition of Outrigger DJ constituted a business combination and was accounted for using the acquisition method of accounting. For tax purposes, the acquisition was accounted for as an acquisition of assets. The acquisition significantly increased the Partnership’s gas processing capacity and footprint in the DJ Basin and diversified its customer base.

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Outrigger DJ Acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Outrigger DJ	$	167,631
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	1,000
Accounts receivable	7,529
Other current assets	190
Property, plant and equipment, net	144,514
Intangible assets	21,447
Trade accounts payable, accrued expenses and other	(7,049)
Net assets acquired and liabilities assumed	$	167,631

The assets acquired and liabilities assumed were recorded at their estimated fair values at the date of the acquisition. Acquired working capital amounts are expected to approximate fair value due to their short-term nature. The valuation of certain assets, including property, are based on appraisals. The fair value of acquired equipment is based on both available market data and cost and income approaches. These methods are considered Level 3 fair value estimates and include significant assumptions of future gathering and processing volumes, commodity prices, and operating and capital cost estimates, discounted using weighted average cost of capital for industry peers.

Intangible assets acquired consist of rights-of-way of $21.4 million with a weighted average amortization period of 30 years.

Acquisition of Sterling DJ. On December 1, 2022, the Partnership completed the acquisition of 100% of the equity interests in each of Sterling Energy Investments LLC, Grasslands Energy Marketing LLC and Centennial Water Pipelines LLC (collectively, “Sterling DJ”) from Sterling Investment Holdings LLC for cash consideration of $140.0 million, subject to customary working capital adjustments.. The acquisition of Sterling DJ constituted a business combination and was accounted for using the acquisition method of accounting. For tax purposes, the acquisition was accounted for as an acquisition of assets. The acquisition significantly increased the Partnership’s gas processing capacity and footprint in the DJ Basin and diversified its customer base.

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Sterling DJ acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Sterling DJ	$	140,396
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	500
Accounts receivable	16,224
Other current assets	4,557
Property, plant and equipment, net	108,720
Intangible assets	38,678
Other noncurrent assets	9,865
Trade accounts payable, accrued expenses and other	(38,148)
Net assets acquired	$	140,396

The assets acquired and liabilities assumed were recorded at their estimated fair values at the date of the acquisition. Acquired working capital amounts are expected to approximate fair value due to their short-term nature. The valuation of certain assets, including property, are based on appraisals. The fair value of acquired equipment is based on both available market data and cost and income approaches. These methods are considered Level 3 fair value estimates and include significant assumptions of future gathering and processing volumes, commodity prices, and operating and capital cost estimates, discounted using weighted average cost of capital for industry peers.

Intangible assets acquired consist of rights-of-way of $30.2 million with a weighted average amortization period of 30 years and indefinite-lived intangible assets of $8.4 million.

Divestiture of Lane G&P System. On June 30, 2022, the Partnership completed the sale of Summit Permian, which owns the Lane Gathering and Processing System (“Lane G&P System”), and Permian Finance to Longwood Gathering and Disposal Systems, LP (“Longwood”), a wholly owned subsidiary of Matador ͏Resources Company (“Matador”). In connection with the transaction, the Partnership released, to a subsidiary of Matador, and Matador agreed to assume, take or-pay firm capacity on the Double E Pipeline.

During 2022, the Partnership recognized an impairment of $84.5 million related to the disposition of the Lane G&P System based on total cash proceeds received of $75.0 million, including $2.0 million of cash sold in the transaction, net assets of $158.3 million, and other costs to sell of $1.2 million.

Divestiture of Bison Midstream. On September 19, 2022, the Partnership completed the sale of Bison Midstream, LLC (“Bison Midstream”), its gas gathering system in Burke and Mountrail Counties, North Dakota to a subsidiary of Steel Reef Infrastructure Corp. (“Steel Reef”), an integrated owner and operator of associated gas capture, gathering and processing assets in North Dakota and Saskatchewan.

During 2022, the Partnership recognized an impairment of $6.9 million related to the disposition of Bison Midstream based on total cash proceeds received of $38.9 million and net assets of $45.8 million. The cash proceeds were used to reduce amounts outstanding under the ABL Facility.

Pro Forma Information (Unaudited). The following table summarizes the unaudited pro forma condensed financial information of SMLP as if the acquisitions of Outrigger DJ and Sterling DJ, along with the dispositions of Bison Midstream and the Lane G&P System, had occurred on January 1, 2021:

	Year Ended December 31, 2022
Revenues	$	543,024
Net loss	$	(36,945)

The unaudited pro forma information is for informational purposes only and is not necessarily indicative of the operating results that would have occurred had the transactions been completed at January 1, 2021, nor is it necessarily indicative of future operating results. The financial data was adjusted to give effect to pro forma events that are i) directly attributable to the transactions, ii) factually supportable, and iii) expected to have a continuing impact on the consolidated results of operations.

Significant adjustments to the pro forma information above include adjustments to interest expense and depreciation based on the purchase price allocated to property, plant, and equipment.

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REVENUE

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

REVENUE

4. REVENUE

The following table presents estimated revenue expected to be recognized over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated MVC shortfall payments.

The Partnership applies the practical expedient in paragraph 606-10-50-14 of Topic 606 for certain arrangements that are considered optional purchases (i.e., there is no enforceable obligation for the customer to make purchases) and those amounts are therefore excluded from the table.

	2024		2025		2026		2027		2028		Thereafter
	(in thousands)
Gathering services and related fees	$	65,472	$	45,594	$	29,292	$	7,685	$	5,137	$	—

Revenue by Category. In the following table, revenue is disaggregated by geographic area and major products and services. For more detailed information about reportable segments, see Note 17 -Segment Information.

	Year ended December 31, 2023
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	63,805	$	—	$	—	$	63,805
Rockies	65,869		173,688		15,474		255,031
Permian	—		—		3,570		3,570
Piceance	81,041		4,788		5,588		91,417
Barnett	37,508		778		6,831		45,117
Total reportable segments	248,223		179,254		31,463		458,940
Corporate and other	—		—		(37)		(37)
Total	$	248,223	$	179,254	$	31,426	$	458,903

	Year ended December 31, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	54,392	$	—	$	—	$	54,392
Rockies	67,838		59,208		16,557		143,603
Permian	3,668		17,382		4,101		25,151
Piceance	80,630		7,111		5,608		93,349
Barnett	41,830		2,503		7,763		52,096
Total reportable segments	248,358		86,204		34,029		368,591
Corporate and other	—		21		982		1,003
Total	$	248,358	$	86,225	$	35,011	$	369,594

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PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

5. PROPERTY, PLANT AND EQUIPMENT

Details on the Partnership’s property, plant and equipment follow.

	December 31, 2023		December 31, 2022
	(In thousands)
Gathering and processing systems and related equipment	$	2,335,980	$	2,262,330
Construction in progress	56,064		59,036
Land and line fill	11,534		11,756
Other	65,029		62,222
Total	2,468,607		2,395,344
Less accumulated depreciation	(770,022)		(676,590)
Property, plant and equipment, net	$	1,698,585	$	1,718,754

When the carrying amount of a long-lived asset is not recoverable, an impairment is recognized equal to the excess of the asset’s carrying value over its fair value, which is based on inputs that are not observable in the market, and thus represent Level 3 inputs under GAAP’s fair value hierarchy. The Partnership recognized $0.5 million and $91.6 million of impairments during the fiscal years ended December 31, 2023 and 2022, respectively. The Partnership cannot predict the likelihood of future impairments, if any.

Depreciation expense and capitalized interest for the Partnership follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation expense	$	95,307	$	93,457
Capitalized interest	1,284		838

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INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

6. INTANGIBLE ASSETS

Details regarding the Partnership’s intangible assets follow.

	December 31, 2023
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(15,747)	$	5,316
Contract intangibles	270,412		(247,024)		23,388
Rights-of-way	205,358		(66,906)		138,452
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	505,269	$	(329,677)	$	175,592

	December 31, 2022
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(14,809)	$	6,254
Contract intangibles	270,412		(228,143)		42,269
Rights-of-way	200,089		(58,330)		141,759
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	500,000	$	(301,282)	$	198,718

The Partnership recognized amortization expense of its favorable gas gathering contracts in Other revenues as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – favorable gas gathering contracts	$	938	$	938

The Partnership recognized amortization expense of its contract and right of way intangibles in costs and expenses as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – contract intangibles	$	18,881	$	18,935
Amortization expense – rights-of-way	8,576		6,527

The Partnership’s estimated aggregate annual amortization expected to be recognized for each of the five succeeding fiscal years and thereafter, as of December 31, 2023, follows.

	(In thousands)
2024	$	18,076
2025	17,892
2026	14,867
2027	8,878
2028	8,711
Thereafter	98,732
	$	167,156

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EQUITY METHOD INVESTMENTS

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

EQUITY METHOD INVESTMENTS

7. EQUITY METHOD INVESTMENTS

The Partnership has equity method investments in Double E and Ohio Gathering, the balances of which are included in the Investment in equity method investees caption on the consolidated balance sheets. Details of the Partnership’s equity method investments follows.

	December 31, 2023		December 31, 2022
	(In thousands)
Double E (1)	$	276,221	$	281,640
Ohio Gathering	210,213		225,037
Total	$	486,434	$	506,677

(1) The Partnership’s investment balance in Double E includes capitalized interest costs.

Double E. The Partnership, through its wholly owned subsidiary Summit Permian Transmission, LLC, has a 70% ownership in Double E Pipeline, LLC (“Double E”). Double E owns a long-haul natural gas pipeline (the “Double E Pipeline”) that provides transportation service for residue natural gas from multiple receipt points in the Delaware Basin to various delivery points in and around the Waha hub in Texas. The Double E Pipeline commenced operations in November 2021 and during the years ended December 31, 2023 and 2022, the Partnership made cash investments of $3.5 million and $8.4 million, respectively, in Double E. During the year ended December 31, 2023, Double E made distributions to its investors totaling $28.3 million of which the Partnership received $19.8 million, of which all amounts were utilized for payment of interest and principal on the Permian Transmission Term Loan and distributions to the holders of the Subsidiary Series A Preferred Units.

Double E is deemed to be a variable interest entity as defined in GAAP. Summit Permian Transmission was not deemed to be the primary beneficiary of Double E due to the voting rights of Double E’s other owner regarding significant matters. The Partnership accounts for its ownership interest in Double E as an equity method investment because it has significant influence over Double E.

Summarized balance sheet information for Double E follows (amounts represent 100% of investee financial information).

	December 31, 2023		December 31, 2022
	(In thousands)
Current assets	$	11,410	$	5,121
Noncurrent assets	391,777		403,594
Total assets	$	403,187	$	408,715
Current liabilities	$	6,373	$	8,635
Noncurrent liabilities	13,727		9,137
Total liabilities	$	20,100	$	17,772

Summarized statements of operations information for Double E follows (amounts represent 100% of investee financial information).

	Year Ended December 31, 2023		Year Ended December 31, 2022
	(In thousands)
Total revenues	$	42,335	$	32,418
Total operating expenses	26,868		25,685
Net income	$	15,467	$	6,733

At December 31, 2023 and 2022, the Partnership’s carrying amount of its interest in Double E approximated its underlying investment.

Ohio Gathering. The Partnership has investments in OGC and OCC that are collectively referred to as Ohio Gathering. Ohio Gathering owns, operates and is currently developing midstream infrastructure consisting of a liquids-rich natural gas gathering system, a dry natural gas gathering system and a condensate stabilization facility in the Utica Shale in southeastern Ohio. Ohio Gathering provides gathering services pursuant to primarily long-term, fee-based gathering agreements, which include acreage dedications. The Partnership made its initial investment in Ohio Gathering in 2014 and owned approximately 36.5% of OGC and approximately 38.2% of OCC at December 31, 2023 and approximately 37.2% of OGC and approximately 38.2% of OCC at December 31, 2022.

Ohio Gathering is accounted for as an equity method investment because it has joint control with non-affiliated owners, which gives the Partnership significant influence.

A reconciliation of the difference between the carrying amount of the Partnership’s interest in Ohio Gathering and the Partnership’s underlying investment in Ohio Gathering, per Ohio Gathering’s books and records, is shown below.

	2023		2022
	(In thousands)
Investment in Ohio Gathering, December 31	$	210,213	$	225,037
December cash distributions	3,950		2,673
Basis difference (1)	190,600		199,263
Investment in Ohio Gathering (Books and records), November 30,	$	404,763	$	426,973

(1) Amount consists of differences created as a result of equity method impairment charges previously recognized which are being amortized over the remaining average life of the underlying assets.

Summarized balance sheet information for OGC and OCC follows (amounts represent 100% of investee financial information).

	November 30, 2023				November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Current assets	$	42,716	$	5,885	$	36,062	$	5,195
Noncurrent assets	1,131,503		1,104		1,157,530		274
Total assets	$	1,174,219	$	6,989	$	1,193,592	$	5,469
Current liabilities	$	6,174	$	3,736	$	6,942	$	3,588
Noncurrent liabilities	14,088		1,149		13,380		3,096
Total liabilities	$	20,262	$	4,885	$	20,322	$	6,684

Summarized statements of operations information for OGC and OCC follows (amounts represent 100% of investee financial information).

	Twelve Months Ended November 30, 2023				Twelve Months Ended November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Total revenues	$	138,707	$	15,603	$	113,317	$	13,340
Total operating expenses	99,770		12,285		106,369		12,786
Net income	38,937		3,318		6,948		554

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DEFERRED REVENUE

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

DEFERRED REVENUE

8. DEFERRED REVENUE

The balances in deferred revenue as of December 31, 2023 and 2022 are primarily related to contributions in aid of construction which will be recognized as revenue over the life of the contract. An update of current deferred revenue is as follows.

	(In thousands)
Current deferred revenue, January 1, 2023	$	9,054
Additions	10,970
Less: revenue recognized and other	(9,828)
Current deferred revenue, December 31, 2023	$	10,196

An update of noncurrent deferred revenue follows.

	(In thousands)
Noncurrent deferred revenue, January 1, 2023	$	37,694
Additions	2,951
Less: reclassification to current deferred revenue and other	(10,560)
Noncurrent deferred revenue, December 31, 2023	$	30,085

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DEBT

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

DEBT

9. DEBT

Debt for the Partnership at December 31, 2023 and 2022 follows.

	December 31, 2023		December 31, 2022
	(In thousands)
ABL Facility: Summit Holdings’ asset based credit facility due May 1, 2026	$	313,000	$	330,000
Permian Transmission Term Loan: Permian Transmission’ variable rate senior secured term loan due January 2028	144,846		155,353
2026 Unsecured Notes: 12.00% senior unsecured notes due October 15, 2026	209,510		—
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025	49,783		259,463
2026 Secured Notes: 8.50% senior second lien notes due October 15, 2026	785,000		785,000
Less: unamortized debt discount and debt issuance costs	(31,449)		(39,454)
Total debt, net of unamortized debt discount and debt issuance costs	1,470,690		1,490,362
Less: current portion of Permian Transmission Term Loan	(15,524)		(10,507)
Total long-term debt	$	1,455,166	$	1,479,855

The aggregate amount of Partnership’s debt maturing during each of the years after December 31, 2023 are as follows (in thousands):

2024	$	15,524
2025	66,363
2026	1,324,477
2027	17,769
2028	78,006
Thereafter	—
Total debt	$	1,502,139

ABL Facility. On November 2, 2021, the Partnership, the Partnership’s subsidiary, Summit Holdings, and the subsidiaries of

Summit Holdings party thereto entered into a first-lien, senior secured credit facility, consisting of a $400.0 million asset-based revolving credit facility (the “ABL Facility”), subject to a borrowing base comprised of a percentage of eligible accounts receivable of Summit Holdings and its subsidiaries that guarantee the ABL Facility (collectively, the “ABL Facility Subsidiary Guarantors”) and a percentage of eligible above-ground fixed assets including eligible compression units, processing plants, compression stations and related equipment of Summit Holdings and the ABL Facility Subsidiary Guarantors. As of December 31, 2023, the most recent borrowing base determination of eligible assets totaled $723.2 million, an amount greater than the $400.0 million of aggregate lending commitments.

As of December 31, 2023, the applicable margin under the adjusted term SOFR borrowings was 3.25%, the interest rate was 8.71% and the unused portion of the ABL Facility totaled $82.7 million after giving effect to the issuance of $4.3 million in outstanding but undrawn irrevocable standby letters of credit.

On November 16, 2023, the Partnership amended the ABL Facility to, among other things, permit the 2023 Exchange Transactions, address springing borrowing base reserves in relation to the outstanding principal amount of the 2025 Senior Notes and amend the Interest Coverage Ratio (as defined in the ABL Agreement) covenant to 1.75x through the end of 2024 and 1.90x thereafter.

Summit Holdings entered into that certain Loan and Security Agreement governing the ABL Facility (the “ABL Agreement”), dated as of November 2, 2021, by and among Summit Holdings, as borrower, the Partnership, the ABL Facility Subsidiary Guarantors, Bank of America, N.A., as agent, ING Capital LLC, Royal Bank of Canada and Regions Bank, as co-syndication agents, and Bank of America, N.A., ING Capital LLC, RBC Capital Markets and Regions Capital Markets, as joint lead arrangers and joint bookrunners.

The ABL Facility will mature on May 1, 2026; provided that if the outstanding amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date (as defined in the ABL Agreement)) on such date equals or exceeds $50.0 million, then the ABL Facility will mature on December 13, 2024. As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

The ABL Facility (together with certain Secured Bank Product Obligations (as defined in the ABL Agreement)) will be jointly and severally guaranteed, on a senior first-priority secured basis (subject to permitted liens), by the Partnership, Summit Holdings and each of the ABL Facility Subsidiary Guarantors.

The ABL Facility restricts, among other things, Summit Holdings’ and its Restricted Subsidiaries’ (as defined in the ABL Agreement) ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions or repurchase equity; (iii) make payments on or redeem junior lien, unsecured or subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications.

The ABL Facility requires that Summit Holdings not permit (i) the First Lien Net Leverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be greater than 2.50:1.00, or (ii) the Interest Coverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be less than 1.75:1.00 through the end of 2024 or less than 1.90:1.00 thereafter. As of December 31, 2023, the First Lien Net Leverage Ratio was 1.22:1.00 and the Interest Coverage Ratio was 1.93:1.00 and the Partnership was in compliance with the financial covenants of the ABL Facility.

The ABL Facility contains certain events of default customary for instruments of this type. In the case of an event of default arising from certain events of bankruptcy, insolvency or reorganization with respect to Summit Holdings, all outstanding Obligations (as defined in the ABL Agreement) will become due and payable immediately without further action or notice and all commitments under the ABL Facility will terminate.

Pursuant to the ABL Agreement, the Obligations (as defined in the ABL Agreement) are (or, subject to post-closing periods for certain types of collateral, will be) generally secured by a first priority lien on and security interest in (subject to permitted liens), subject to certain exclusions and limitations set forth in the ABL Agreement, (i) substantially all of the personal property of Summit Holdings and the ABL Facility Subsidiary Guarantors, (ii) all equity interests in Summit Holdings and certain other entities, all debt securities and certain rights related to the foregoing, in each case, owned by the Partnership, (iii) Closing Date Material Gathering Station Real Property and Closing Date Pipeline Material Gathering Station Real Property (each, as defined in the ABL Agreement) and certain other material real property interests (including improvements thereon) of Summit Holdings and the ABL Facility Subsidiary Guarantors as provided in the ABL Agreement and (iv) all proceeds of the foregoing collateral.

Intercreditor Agreement.

On November 2, 2021, in connection with the entry into the ABL Facility and issuance of the 2026 Secured Notes, Summit Holdings and the other guarantors party thereto entered into an Intercreditor Agreement (the “Intercreditor Agreement”) with Bank of America, N.A., as first lien representative and collateral agent for the initial first lien claimholders, Regions Bank, as second lien representative for the initial second lien claimholders and collateral agent for the initial second lien claimholders, establishing (i) a first-priority lien (subject to permitted liens) status for the liens on the collateral securing the ABL Facility and any additional first-lien indebtedness and (ii) a junior priority lien (subject to permitted liens) status for the liens on the collateral securing the 2026 Secured Notes and any additional second-lien indebtedness.

Permian Transmission Credit Facilities. On March 8, 2021 (the “Permian Closing Date”), the Partnership’s unrestricted subsidiary, Permian Transmission, entered into a Credit Agreement which allows for $175.0 million of senior secured credit facilities, including a $160.0 million Term Loan Facility and a $15.0 million Working Capital Facility. The Permian Transmission Credit Facilities can be used to finance Permian Transmission’s capital calls associated with its investment in Double E, debt service and other general corporate purposes. Unexpended proceeds from draws on the Permian Transmission Credit Facilities are classified as restricted cash on the accompanying unaudited condensed consolidated balance sheets.

On June 27, 2023, we amended the Permian Transmission Credit Facilities to, among other things, transition the LIBOR based interest rates under the Permian Transmission Credit Facilities to term SOFR.

As of December 31, 2023, the applicable margin under adjusted term SOFR borrowings was 2.475%, the interest rate was 7.79% and the unused portion of the Permian Transmission Credit Facilities totaled $4.5 million, subject to a commitment fee of 0.7% after giving effect to the issuance of $10.5 million in outstanding but undrawn irrevocable standby letters of credit. Summit Permian Transmission, LLC entered into interest rate hedges with notional amounts representing approximately 90% of the Permian Term Loan facility at a fixed SOFR rate of 1.23%. As of December 31, 2023, the Partnership was in compliance with the financial covenants of the Permian Transmission Credit Facilities.

Permian Transmission Term Loan. As described above, in January 2022, the Permian Term Loan Facility was converted into a Term Loan (the “Permian Transmission Term Loan”). The Permian Transmission Term Loan is due January 2028. As of December 31, 2023, the applicable margin under adjusted term SOFR borrowings was 2.475% and the interest rate was 7.79%. As of December 31, 2023, the Partnership was in compliance with the financial covenants governing the Permian Transmission Term Loan.

In accordance with the terms of the Permian Transmission Term Loan, Permian Transmission is required to make mandatory principal repayments. Below is a summary of the remaining mandatory principal repayments as of December 31, 2023:

(In thousands)	Total		2024		2025		2026		2027		2028
Amortizing principal repayments	$	144,846	$	15,524	$	16,580	$	16,967	$	17,769	$	78,006

2026 Secured Notes. In 2021, the Co-Issuers issued $700.0 million of 8.500% Senior Secured Second Lien Notes due 2026 (the “2026 Secured Notes”) to eligible purchasers pursuant to Rule 144A and Regulation S of the Securities Act, at a price of 98.5% of their face value. Additionally, in November 2022, in connection with the 2022 DJ Acquisitions, the Co-Issuers issued an additional $85.0 million of 2026 Secured Notes at a price of 99.26% of their face value. The 2026 Secured Notes will pay interest semi-annually on April 15 and October 15 of each year, commencing on April 15, 2022, and are jointly and severally guaranteed, on a senior second-priority secured basis (subject to permitted liens), by the Partnership and each restricted subsidiary of the Partnership (other than the Co-Issuers) that is an obligor under the ABL Agreement, or under the Co-Issuers’ 2025 Senior Notes on the issue date of the 2026 Secured Notes.

The 2026 Secured Notes will mature on October 15, 2026; provided that, if the outstanding amount of the 2025 Senior Notes (or any refinancing indebtedness in respect thereof that has a final maturity on or prior to the date that is 91 days after the Initial Maturity Date (as defined in the 2026 Secured Notes Indenture)) is greater than or equal to $50.0 million on January 14, 2025, which is 91 days prior to the scheduled maturity date of the 2025 Senior Notes, then the 2026 Secured Notes will mature on January 14, 2025.

The Partnership used the net proceeds from the offering of the 2026 Secured Notes, together with cash on hand and borrowings under the ABL Facility, to repay in full all of Summit Holdings’ obligations under the Revolving Credit Facility.

2026 Secured Notes Indenture.

The Co-Issuers issued the 2026 Secured Notes pursuant to an indenture (the “2026 Secured Notes Indenture”), dated as of November 2, 2021, by and among the Co-Issuers, the Partnership, any other Restricted Subsidiary (as defined in the 2026 Secured Notes Indenture) of the Partnership that provides a Notes Guarantee (as defined in the 2026 Secured Notes Indenture) and Regions Bank, as trustee (the “2026 Secured Notes Trustee”) and collateral agent, setting forth specific terms applicable to the 2026 Secured Notes.

At any time prior to October 15, 2023, the Co-Issuers could have on any one or more occasions redeemed up to 35% of the aggregate principal amount of the 2026 Secured Notes (including any additional notes) issued under the 2026 Secured Notes Indenture at a redemption price of 108.5% of the principal amount of the 2026 Secured Notes, plus accrued and unpaid interest, if any, to, but not including, the redemption date, in an amount not greater than the net cash proceeds of certain equity offerings by the Partnership, provided that: (i) at least 65% of the initial aggregate principal amount of the 2026 Secured Notes (including any additional notes) remains outstanding immediately after the occurrence of such redemption (excluding notes held by the Partnership and its subsidiaries); and (ii) the redemption occurs within 180 days of the date of the closing of each such equity offering by the Partnership. On and after October 15, 2023, the Co-Issuers may redeem all or part of the 2026 Secured Notes at redemption prices (expressed as percentages of principal amount) equal to: (a) 104.250% for the twelve-month period beginning October 15, 2023; (b) 102.125% for the twelve-month period beginning October 15, 2024; and (c) 100.000% for the twelve-month period beginning on October 15, 2025 and at any time thereafter, in each case plus accrued and unpaid interest, if any, to, but not including, the redemption date. In certain circumstances, the Co-Issuers will be required to offer to purchase the 2026 Secured Notes with excess proceeds from asset sales, excess cash flow and upon the occurrence of certain change of control events.

The 2026 Secured Notes Indenture restricts the Partnership’s and its Restricted Subsidiaries’ ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions, repurchase equity or redeem junior lien, unsecured or subordinated debt; (iii) make payments on junior lien, unsecured or subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications. At any time when the 2026 Secured Notes are rated investment grade by at least two of Moody’s Investors Service, Inc., Standard & Poor’s Ratings Services or Fitch Ratings, Inc., many of these covenants will terminate. As of December 31, 2023, the Partnership was in compliance with the financial covenants of the 2026 Secured Notes.

The 2026 Secured Notes Indenture contains certain events of default customary for instruments of this type.

In the case of an event of default arising from certain events of bankruptcy, insolvency or reorganization with respect to either Co-Issuer, the Partnership, and certain significant subsidiaries of the Partnership, all outstanding Notes will become due and payable immediately without further action or notice. If any other event of default occurs and is continuing, the 2026 Secured Notes Trustee or the holders of at least 25% in principal amount of the then outstanding Notes may declare all the 2026 Secured Notes to be due and payable immediately.

Collateral Agreement.

On November 2, 2021, the Co-Issuers, as pledgors and grantors, entered into, in connection with the 2026 Secured Notes Indenture, a Collateral Agreement (Second Lien), with the Partnership, as a pledgor, each subsidiary guarantor listed therein and Regions Bank, as collateral agent (the “Collateral Agreement”). Pursuant to the Collateral Agreement and the 2026 Secured Notes Indenture, the obligations under the 2026 Secured Notes Indenture are (or, subject to post-closing periods for certain types of collateral, will be) generally secured by a second priority lien on and security interest in (subject to permitted liens) the assets of the Partnership, the Co-Issuers and the subsidiary guarantors securing their obligations under the ABL Facility (as described above under “ABL Facility”).

Excess Cash Flow Offers to Purchase.

Starting in the first quarter of 2023 with respect to the fiscal year ended 2022, and continuing annually through the fiscal year 2025, the Partnership is required under the terms of the 2026 Secured Notes Indenture to, if it has Excess Cash Flow (as defined in the 2026 Secured Notes Indenture), and subject to its ability to make such an offer under the ABL Facility, offer to purchase an amount of the 2026 Secured Notes, at 100% of the principal amount plus accrued and unpaid interest, equal to 100% of the Excess Cash Flow generated in the prior year. Excess Cash Flow is generally defined as consolidated cash flow minus the sum of capital expenditures and cash payments in respect of permitted investments and permitted restricted payments.

Generally, if the Partnership does not offer to purchase designated annual amounts of its 2026 Secured Notes or reduce its first lien capacity under the 2026 Secured Notes Indenture per annum from 2023 through 2025, the interest rate on the 2026 Secured Notes is subject to certain rate escalations. Per the terms of the 2026 Secured Notes Indenture, the designated amounts are to offer to purchase $50.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2023, otherwise the interest rate shall automatically increase by 50 basis points per annum; $100.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2024, otherwise the interest rate shall automatically increase by 100 basis points per annum (minus any amount previously increased); and $200.0 million aggregate principal amount of the 2026 Secured Notes by April 1, 2025, otherwise the interest rate shall automatically increase by 200 basis points per annum (minus any amount previously increased). The Partnership does not anticipate making offers to purchase in the designated amount for the fiscal year ended 2023, and, as a result, the interest rate on the 2026 Secured Notes will increase an incremental 50 basis points to 9.50% effective April 1, 2024, resulting in an incremental increase in annual interest expense of approximately $3.9 million.

To the extent the Partnership makes an offer to purchase, and the offer is not fully accepted by the holders of the 2026 Secured Notes, the Partnership may use any remaining amount not accepted for any purpose not prohibited by the 2026 Secured Notes Indenture or the ABL Facility.

2026 Unsecured Notes. In November 2023, the Co-Issuers issued a total of $209.5 million aggregate principal amount of 2026 Unsecured Notes in exchange for $180.0 million aggregate principal amount of the 2025 Senior Notes and $29.5 million in cash. The cash raised was used to repurchase $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. The Partnership pays interest on the 2026 Unsecured Notes semi-annually in cash in arrears on April 15 and October 15 of each year. The 2026 Unsecured Notes are senior, unsecured obligations and rank equally in right of payment with all of the Partnership’s existing and future senior obligations. The 2026 Unsecured Notes are effectively subordinated in right of payment to all of the Partnership’s secured indebtedness, to the extent of the collateral securing such indebtedness.

The Co-Issuers have the right to redeem all or part of the 2026 Unsecured Notes at a redemption price of (a) on or before April 15, 2025, 101.000%, and (b) after April 15, 2025, 102.000%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As December 31, 2023, the Partnership was in compliance with the financial covenants of the 2026 Unsecured Notes. The 2026 Unsecured Notes will mature on October 15, 2026.

2026 Unsecured Notes Indenture.

The Co-Issuers issued the 2026 Secured Notes pursuant to an indenture (the “2026 Unsecured Notes Indenture”), dated as of November 21, 2023, by and among the Co-Issuers, the guarantors party thereto and Regions Bank, as trustee (the “2026 Unsecured Notes Trustee”), setting forth specific terms applicable to the 2026 Unsecured Notes.

The indenture governing the 2026 Unsecured Notes restricts the Partnership’s and the Co-Issuers’ ability and the ability of certain of their subsidiaries to: (i) incur additional debt or issue preferred stock; (ii) make distributions, repurchase equity or redeem subordinated debt; (iii) make payments on subordinated indebtedness; (iv) create liens or other encumbrances; (v) make investments, loans or other guarantees; (vi) sell or otherwise dispose of a portion of their assets; (vii) engage in transactions with affiliates; and (viii) make acquisitions or merge or consolidate with another entity. These covenants are subject both to a number of important exceptions and qualifications. At any time when the 2026 Unsecured Notes are rated investment grade by Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Services and no Default or Event of Default (each as defined in the indenture governing the 2026 Unsecured Notes) has occurred and is continuing, many of these covenants will terminate.

The indenture governing the 2026 Unsecured Notes provides that each of the following is an Event of Default: (i) default for 30 days in the payment when due of interest on the 2026 Unsecured Notes; (ii) default in payment when due of the principal of, or premium, if any, on the 2026 Unsecured Notes; (iii) failure by the Co-Issuers or the Partnership to comply with certain covenants relating to merger, consolidation, sale of assets, change of control or asset sales; (iv) failure by the Partnership for 180 days after notice to comply with certain covenants relating to the filing of annual, quarterly and current reports with the SEC; (v) failure by the Co-Issuers or the Partnership for 30 days after notice to comply with any of the other agreements in the indenture governing the 2026 Unsecured Notes; (vi) default under any mortgage, indenture or instrument under which there may be issued or by which there may be secured or evidenced any indebtedness for money borrowed by the Partnership or any of its restricted subsidiaries (or the payment of which is guaranteed by the Partnership or any of its restricted subsidiaries) if that default: (a) is caused by a failure to pay principal of, or interest or premium, if any, on such indebtedness prior to the expiration of the grace period provided in such indebtedness (a “Payment Default”); or (b) results in the acceleration of such indebtedness prior to its stated maturity, and, in each case, the principal amount of any such indebtedness, together with the principal amount of any other such indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated, aggregates $75.0 million or more; (vii) failure by the Partnership or any of its restricted subsidiaries to pay final judgments aggregating in excess of $75.0 million, which judgments are not paid, discharged or stayed for a period of 60 days; (viii) except as permitted by the indenture governing the 2026 Unsecured Notes, any guarantee shall be held in any judicial proceeding to be unenforceable or invalid or shall cease for any reason to be in full force and effect or any Guarantor, or any person acting on behalf of any Guarantor, shall deny or disaffirm its obligations under its guarantee of the 2026 Unsecured Notes; and (ix) certain events of bankruptcy, insolvency or reorganization described in the indenture governing the 2026 Unsecured Notes with respect to the Co-Issuers, the Partnership or any of the Partnership’s restricted subsidiaries that is a significant subsidiary or any group of the Partnership’s restricted subsidiaries that, taken as a whole, would constitute a significant subsidiary of the Partnership.

In the case of an Event of Default arising from certain events of bankruptcy, insolvency or reorganization with respect to either Co-Issuer, the Partnership, any of the Partnership’s restricted subsidiaries that is a significant subsidiary or any group of the Partnership’s restricted subsidiaries that, taken as a whole, would constitute a significant subsidiary, all outstanding 2026 Unsecured Notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the 2026 Unsecured Notes Trustee or the holders of at least 25% in principal amount of the then outstanding 2026 Unsecured Notes may declare all the 2026 Unsecured Notes to be due and payable immediately.

2025 Senior Notes. In February 2017, the Co-Issuers co-issued the 2025 Senior Notes. The Partnership pays interest on the 2025 Senior Notes semi-annually in cash in arrears on April 15 and October 15 of each year. The 2025 Senior Notes are senior, unsecured obligations and rank equally in right of payment with all of the Partnership’s existing and future senior obligations. The 2025 Senior Notes are effectively subordinated in right of payment to all of the Partnership’s secured indebtedness, to the extent of the collateral securing such indebtedness.

The Co-Issuers have the right to redeem all or part of the 2025 Senior Notes at a redemption price of 100.00%, plus accrued and unpaid interest, if any, to, but not including, the redemption date.

As discussed above, in November, 2023, the Partnership exchanged $180.0 million aggregate principal amount of the 2025 Senior Notes and repurchased $29.7 million aggregate principal amount of the remaining 2025 Senior Notes that were not exchanged. As of December 31, 2023, the outstanding balance of the 2025 Senior Notes was $49.8 million.

As of December 31, 2023, the Partnership was in compliance with the financial covenants of the 2025 Senior Notes. The 2025 Senior Notes will mature on April 15, 2025.

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

10. COMMITMENTS AND CONTINGENCIES

Environmental Matters. Although the Partnership believes that it is in material compliance with applicable environmental regulations, the risk of environmental remediation costs and liabilities are inherent in pipeline ownership and operation. Furthermore, the Partnership can provide no assurances that significant environmental remediation costs and liabilities will not be incurred in the future. The Partnership is currently not aware of any material contingent liabilities that exist with respect to environmental matters, except as noted below.

As of December 31, 2023, the Partnership has recognized (i) a current liability for remediation effort expenditures expected to be incurred within the next 12 months and (ii) a noncurrent liability for estimated remediation expenditures expected to be incurred subsequent to December 31, 2024. Each of these amounts represent the Partnership’s best estimate for costs expected to be incurred. Neither of these amounts have been discounted to their present value.

An update of the Partnership’s undiscounted accrued environmental remediation is as follows and is primarily related to the 2015 Blacktail Release and other environmental remediation activities, as described below.

	(In thousands)
Accrued environmental remediation, December 31, 2021	$	5,606
Payments made	(2,746)
Additional accruals	845
Accrued environmental remediation, December 31, 2022	$	3,705
Payments made	(641)
Changes in estimates	(127)
Accrued environmental remediation, December 31, 2023	$	2,937

In 2015, the Partnership learned of the rupture of a four-inch produced water gathering pipeline on the Meadowlark Midstream system near Williston, North Dakota (“2015 Blacktail Release”). On August 4, 2021, subsidiaries of the Partnership entered into the following agreements to resolve the U.S. federal and North Dakota state governments’ environmental claims with respect to the 2015 Blacktail Release: (i) a Consent Decree with the U.S. Department of Justice (“DOJ”), the U.S. Environmental Protection Agency (“EPA”), and the State of North Dakota (“Consent Decree”); (ii) a Plea Agreement with the United States (“Plea Agreement”); and (iii) a Consent Agreement with the North Dakota Industrial Commission (“Consent Agreement” together with the Consent Decree and Plea Agreement, the “Global Settlement”). As of December 31, 2023 and 2022, the accrued loss liability for the 2015 Blacktail Release was $21.7 million and $28.3 million, respectively, and are recorded within Other noncurrent liabilities and Accrued settlements payable within the consolidated balance sheets.

Key terms of the Global Settlement included (i) payment of penalties and fines totaling $36.3 million, consisting of $1.25 million in natural resource damages payable to federal and state governments, a $25.0 million payable to the federal government over five years, and a $10.0 million payable to state governments over, for the federal and state civil amounts six years, and, for the federal criminal amounts, five years, with interest applied to unpaid amounts accruing at, for the federal and state civil amounts, a fixed rate of 3.25%, and, for the federal criminal amounts, a variable rate set by statute, and of which $6.7 million is expected to be paid within the next twelve months; (ii) continuation of remediation efforts at the site of the 2015 Blacktail Release; (iii) other injunctive relief including but not limited to control room management, environmental management system audit, training, and reporting; (iv) guilty pleas by Defendant subsidiary for (a) one charge of negligent discharge of a harmful quantity of oil and (b) one charge of knowing failure to immediately report a discharge of oil; and (v) organizational probation for a minimum period of three years from sentencing on December 6, 2021, including payment in full of certain components of the fines and penalty amounts. The agreements comprising the Global Settlement were subject to the approval of the U.S. District Court for the District of North Dakota (the “U.S. District Court”). The U.S. District Court entered an order making the civil components of the Global Settlement effective on September 28, 2021 and accepted the sentencing in the Plea Agreement on December 6, 2021, completing approval of the Global Settlement.

Subsidiaries of the Partnership are also participating in two proceedings before the EPA as a result of the Plea Agreement becoming effective. Following the U.S. District Court’s entering judgment on Defendant subsidiary’s guilty plea to one count of negligent discharge of produced water in violation of the Clean Water Act, Defendant subsidiary was statutorily debarred by operation of law pursuant to 33 U.S.C. § 1368(a) to participate in federal awards performed at the “violating facility,” which EPA determined to be the Marmon subsystem of the produced water gathering system in North Dakota. The scope and effect of the debarment as defined did not materially affect the Partnership’s operations. Defendant has submitted a petition for reinstatement, which was denied by the EPA’s suspension and debarment office (“SDO”) on July 11, 2022. The SDO determined that the term of probation in the Plea Agreement was the appropriate period of time to demonstrate Defendant subsidiary’s change of corporate attitude, policies, practices, and procedures. The Partnership and certain subsidiaries have also received a show cause notice from the EPA requesting us to “show cause” why SDO should not issue a Notice of Proposed Debarment to the Defendant subsidiary and certain affiliates under 2 C.F.R. § 180.800(d), to which we have responded, and in which proceeding no further developments have occurred.

Legal Proceedings. The Partnership is involved in various litigation and administrative proceedings arising in the ordinary course of business. In the opinion of management, any liabilities, which include insured claims, would not individually or in the aggregate have a material adverse effect on the Partnership's financial position or results of operations.

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FINANCIAL INSTRUMENTS

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

11. FINANCIAL INSTRUMENTS

Concentrations of Credit Risk. Financial instruments that potentially subject the Partnership to concentrations of credit risk consist of cash and cash equivalents, restricted cash and accounts receivable. The Partnership maintains its cash and cash

equivalents and restricted cash in bank deposit accounts that frequently exceed federally insured limits. The Partnership has not experienced any losses in such accounts and does not believe it is exposed to any significant risk.

Accounts receivable primarily comprise amounts due for the gathering, compression, treating and processing services the Partnership provides to its customers and also the sale of natural gas liquids resulting from its processing services. This industry concentration has the potential to impact its overall exposure to credit risk, either positively or negatively, in that the Partnership’s customers may be similarly affected by changes in economic, industry or other conditions. The Partnership monitors the creditworthiness of its counterparties and can require letters of credit or other forms of credit assurance for receivables from counterparties that are judged to have substandard credit, unless the credit risk can otherwise be mitigated.

Fair Value. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable and trade accounts payable reported on the consolidated balance sheet approximates fair value due to their short-term maturities.

A summary of the estimated fair value of the Partnership’s debt financial instruments follows.

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(in thousands)
2025 Senior Notes	$	49,783	$	48,414	$	259,463	$	221,733
2026 Secured Notes	$	785,000	$	778,131	$	785,000	$	750,983
2026 Unsecured Notes	$	209,510	$	203,225	$	—	$	—

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

The carrying value on the balance sheets of the ABL Facility and Permian Transmission Term Loan represent their fair value due to its floating interest rate. The fair value for the 2026 Unsecured Notes, 2026 Secured Notes and 2025 Senior Notes is based on an average of nonbinding broker quotes as of December 31, 2023 and 2022. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value of the Senior Notes.

Deferred earn-out. As a result of the acquisition of Sterling DJ, the Partnership assumed a deferred earn-out liability, which is remeasured each reporting period. As of December 31, 2023 and 2022, the estimated fair value of the deferred earn-out liability was $5.1 million and $5.2 million and was estimated using a discounted cash flow technique based on estimated future fresh water deliveries and appropriate discount rates, and the balances are recorded within other noncurrent liabilities on the consolidated balance sheets. Given the unobservable nature of the inputs, the fair value measurement of the deferred earn-out is deemed to use Level 3 inputs. The deferred earn-out sits within Centennial Water Pipelines LLC, one of the Partnership’s unrestricted subsidiaries.

Interest Rate Swaps. In connection with the Permian Transmission Term Loan, formerly the Permian Transmission Credit Facilities, the Partnership entered into amortizing interest rate swap agreements. As of December 31, 2023 and 2022, the outstanding notional amount of interest rate swaps was $130.4 million and $139.8 million, respectively. These interest rate swaps manage exposure to variability in expected cash flows attributable to interest rate risk. Interest rate swaps convert a portion of the Partnership’s variable rate debt to fixed rate debt. The Partnership chooses counterparties for its derivative instruments that it believes are creditworthy at the time the transactions are entered into, and the Partnership actively monitors the creditworthiness where applicable. However, there can be no assurance that a counterparty will be able to meet its obligations to the Partnership. The Partnership presents its derivative positions on a gross basis and does not net the asset and liability positions. During 2023, the Partnership amended its interest rate swap agreements to, among other things, replace its LIBOR based terms with a SOFR rate terms.

As of December 31, 2023 and 2022, the Partnership’s interest rate swap agreements had a fair value of $11.9 million and $15.2 million, respectively, and are recorded within other noncurrent assets within the consolidated balance sheets. The derivative instruments’ fair value are determined using level 2 inputs from the fair value hierarchy.

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PARTNERS' CAPITAL AND MEZZANINE CAPITAL

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

PARTNERS' CAPITAL AND MEZZANINE CAPITAL

12. PARTNERS' CAPITAL AND MEZZANINE CAPITAL

Common Units. An update on the number of common units is as follows for the period from December 31, 2021 to December 31, 2023.

	Common Units
December 31, 2021	7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes	2,853,875
Common units issued for SMLP LTIP, net	159,054
December 31, 2022	10,182,763
Common units issued for SMLP LTIP, net	193,426
December 31, 2023	10,376,189

Series A Preferred Units. In November 2017, the Partnership issued 300,000 Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series A Preferred Units”) representing limited partner interests in the Partnership at a price to the public of $1,000 per unit. 

The Series A Preferred Units rank senior to (i) common units representing limited partner interests in the Partnership and (ii) each other class or series of limited partner interests or other equity securities in the Partnership that may be established in the future that expressly ranks junior to the Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. The Series A Preferred Units rank equal in all respects with each class or series of limited partner interests or other equity securities in the Partnership that may be established in the future that is not expressly made senior or subordinated to the Series A Preferred Units as to the payment of distributions and amounts payable on a liquidation event. The Series A Preferred Units rank junior to (i) all of the Partnership’s existing and future indebtedness and other liabilities with respect to assets available to satisfy claims against the Partnership and (ii) each other class or series of limited partner interests or other equity securities in the Partnership established in the future that is expressly made senior to the Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. Income is allocated to the Series A Preferred Units in an amount equal to the earned distributions (whether these distributions are declared by the General Partner to be paid or not) for the respective reporting period.

Distributions on the Series A Preferred Units are cumulative and compounding and are payable semi-annually in arrears on the 15th day of each June and December through and including December 15, 2022, and, thereafter, quarterly in arrears on the 15th day of March, June, September and December of each year (each, a “Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Distribution Payment Date, in each case, when, as, and if declared by the General Partner out of legally available funds for such purpose.

The initial distribution rate for the Series A Preferred Units is 9.50% per annum of the $1,000 liquidation preference per Series A Preferred Unit. On and after December 15, 2022, distributions on the Series A Preferred Units will accumulate for each distribution period at a percentage of the liquidation preference equal to the three-month LIBOR plus a spread of 7.43%. During the fourth quarter of 2023, distributions on the Series A Preferred Units began to accumulate at a rate equal to the three-month SOFR plus a spread of 7.69%. The floating rate established on December 15, 2023 for the period ending March 31, 2024 was 13.1%.

The Partnership suspended its distributions to be paid to holders of its Series A Preferred Units, commencing with respect to the quarter ending March 31, 2020. As of December 31, 2023, the amount of accrued and unpaid distributions on the Series A Preferred Units was $33.0 million.

A rollforward of the number of outstanding Series A Preferred Units follows for the period from December 31, 2021 to December 31, 2023.

	Series A Preferred Units
December 31, 2021	143,447
2022 Preferred Exchange Offer	(77,939)
December 31, 2022	65,508
2023 activity	—
December 31, 2023	65,508

2022 Preferred Exchange Offer. In January 2022, the Partnership completed an offer to exchange its Series A Preferred Units for newly issued common units (the “2022 Preferred Exchange Offer”), whereby it issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units. Upon the settlement of the 2022 Preferred Exchange Offer, the Partnership eliminated $92.6 million of the Series A Preferred Unit liquidation preference amount, inclusive of accrued distributions due as of the settlement date.

Subsidiary Series A Preferred Units. The Partnership has Subsidiary Series A Preferred Units that ranks senior to each other class or series of limited partner interests or other equity securities in Permian Holdco that may be established in the future that expressly ranks junior to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. The Subsidiary Series A Preferred Units rank equal in all respects with each class or series of limited partner interests or other equity securities in Permian Holdco that may be established in the future that is not expressly made senior or subordinated to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable on a liquidation event. The Subsidiary Series A Preferred Units rank junior to (i) all of Permian Holdco’s or a subsidiary of Permian Holdco’s future indebtedness and other liabilities with respect to assets available to satisfy claims against Permian Holdco and (ii) each other class or series of limited partner interests or other equity securities in Permian Holdco established in the future that is expressly made senior to the Subsidiary Series A Preferred Units as to the payment of distributions and amounts payable upon a liquidation event. Income is allocated to the Subsidiary Series A Preferred Units in an amount equal to the earned distributions for the respective reporting period.

Distributions on the Subsidiary Series A Preferred Units are cumulative and compounding and are payable 21 days following the quarterly period ended March, June, September and December of each year (each, a “Series A Distribution Payment Date”) to holders of record as of the close of business on the first business day of the month of the applicable Series A Distribution Payment Date, in each case, when, as, and if declared by Permian Holdco out of legally available funds for such purpose.

The distribution rate for the Subsidiary Series A Preferred Units is 7.00% per annum of the $1,000 liquidation preference per Subsidiary Series A Preferred Unit. A pro-rated initial distribution on the Subsidiary Series A Preferred Units was Paid-in-kind (“PIK”) on January 21, 2020 in an amount equal to 7.00% per Subsidiary Series A Preferred Unit plus 1.00% per annum of the undrawn commitment units.

These Subsidiary Series A Preferred Units are considered redeemable securities under GAAP due to the existence of certain redemption provisions that are outside of the Partnership’s control. Therefore, the securities are classified as temporary equity in the mezzanine section of the consolidated balance sheets.

The Partnership records its Subsidiary Series A Preferred Units at fair value upon issuance, net of issuance costs, and subsequently records an effective interest method accretion amount each reporting period to accrete the carrying value to a most probable redemption value that is based on a predetermined internal rate of return measure. The Partnership also elected to make PIK distributions to holders of the Subsidiary Series A Preferred Units during portions of the year ended December 31, 2022, which increase the liquidation preference on each Subsidiary Series A Preferred Unit. Ultimately, Net Income (Loss) Attributable to common limited partners includes adjustments for PIK distributions and redemption accretion. During the year ended December 31, 2022, the Partnership issued 1,600 Subsidiary Series A Preferred Units, through PIK transactions. The Partnership did not make any PIK distributions during the year ended December 31, 2023. As of December 31, 2023 and 2022, the Partnership had 93,039 Subsidiary Series A Preferred Units outstanding.

If the Subsidiary Series A Preferred Units were redeemed on December 31, 2023, the redemption amount would be $125.5 million, when considering the applicable multiple of invested capital metric and make-whole amount provisions contained in the Amended and Restated Limited Liability Company Agreement of Permian Holdco. 

The following table shows the change in the Partnership’s Subsidiary Series A Preferred Unit balance from January 1, 2022 through December 31, 2023, net of $1.7 million and $2.2 million of unamortized issuance costs at December 31, 2023 and December 31, 2022, respectively:

	(in thousands)
Balance at January 1, 2022	$	106,325
PIK distributions	1,600
Redemption accretion, net of issuance cost amortization	15,544
Cash distribution (includes $1.6 million distributions payable as of December 31, 2022)	(4,885)
Balance at December 31, 2022	$	118,584
Redemption accretion, net of issuance cost amortization	12,581
Cash distribution (includes $1.6 million distributions payable as of December 31, 2023)	(6,513)
Balance at December 31, 2023	$	124,652

Cash Distribution Policy. The Partnership suspended its cash distributions to holders of its common units and Series A Preferred Units, commencing with respect to the quarter ending March 31, 2020. Upon the resumption of distributions, the Partnership Agreement requires that it distribute all available cash, subject to reserves established by its General Partner, within 45 days after the end of each quarter to unitholders of record on the applicable record date. The amount of distributions paid under this policy is subject to fluctuations based on the amount of cash the Partnership generates from its business and the

decision to make any distribution is determined by the General Partner, taking into consideration the terms of the Partnership Agreement.

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EARNINGS PER UNIT

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

EARNINGS PER UNIT

13. EARNINGS PER UNIT

The following table details the components of EPU.

	Year ended December 31,
	2023		2022
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net loss	$	(38,947)	$	(123,461)
Less: Net income attributable to Subsidiary Series A Preferred Units	(12,581)		(17,144)
Net loss attributable Summit Midstream Partners, LP	(51,528)		(140,605)
Less: Net income attributable to Series A Preferred Unit	(11,566)		(8,048)
Add: Deemed capital contribution	—		20,974
Net loss attributable to common limited partners	$	(63,094)	$	(127,679)
Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	10,334		10,048
Effect of nonvested phantom units	—		—
Weighted-average common units outstanding – diluted	10,334		10,048
Net Loss per limited partner unit:
Common unit – basic	$	(6.11)	$	(12.71)
Common unit – diluted	$	(6.11)	$	(12.71)
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	245		177

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SUPPLEMENTAL CASH FLOW INFORMATION

12 Months Ended

Dec. 31, 2023

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

14. SUPPLEMENTAL CASH FLOW INFORMATION

	Year ended December 31,
	2023		2022
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	127,022	$	89,472
Cash paid for taxes	15		149
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	11,612	$	6,724
2025 Senior Notes Exchange	180,030		—
Accretion of Subsidiary Series A Preferred Units	12,581		15,544
Right-of-use assets acquired in connection with Sterling DJ acquisition	—		9,865
2022 Preferred Exchange Offer	—		92,587

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UNIT-BASED AND NONCASH COMPENSATION

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

UNIT-BASED AND NONCASH COMPENSATION

15. UNIT-BASED AND NONCASH COMPENSATION

SMLP Long-Term Incentive Plan. The Partnership’s Long-Term Incentive Plan (“SMLP LTIP”) provides for equity awards to eligible officers, employees, consultants and directors of the Partnership, thereby linking the recipients' compensation directly to SMLP’s performance. The SMLP 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. Initially, a total of 1.0 million common units was reserved for issuance pursuant to and in accordance with the SMLP LTIP. On June 24, 2022 unitholders of the Partnership approved the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, which increased the number of common units available for issuance to the Partnership’s employees, consultants and directors. As of December 31, 2023, approximately 0.5 million common units remained available for future issuance under the SMLP LTIP, which includes the impact of 0.7 million granted but unvested phantom units.

Significant items for the year ended December 31, 2023:

•For the year ended December 31, 2023, the Partnership granted 212,893 phantom units and associated distribution equivalent rights to employees. These awards granted during the year ended December 31, 2023 had a fair values of $16.00 per common unit and vest ratably over a three-year period.

•For the year ended December 31, 2023, the Partnership granted 110,478 performance-based phantom units and associated distribution equivalent rights to certain members of management in connection with the Partnership’s annual incentive compensation award cycle. The grant date fair value of these awards total $2.2 million.

•For the year ended December 31, 2023, the Partnership issued 38,100 common units to the Partnership’s six independent directors in connection with their annual compensation plan. These awards had a grant date fair value of $16.00 per common unit and vested immediately.

The following table presents phantom unit activity for the periods presented:

	Units	Weighted-average grant date fair value
Nonvested phantom units, December 31, 2021	333,779	$	21.78
Phantom units granted	509,631	17.70
Phantom units vested	(229,551)	23.61
Phantom units forfeited	(8,717)	22.53
Nonvested phantom units, December 31, 2022	605,142	17.62
Phantom units granted	323,371	17.29
Phantom units vested	(236,154)	15.69
Phantom units forfeited	(3,892)	20.50
Nonvested phantom units, December 31, 2023	688,467	$	17.69

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.

Phantom units granted to date generally vest ratably over a three-year period. Grant date fair value is determined based on the closing price of SMLP’s common units on the date of grant multiplied by the number of phantom units awarded to the grantee. Forfeitures are recorded as incurred. Holders of all phantom units granted to date are entitled to receive distribution equivalent rights for each phantom unit, providing for a lump sum cash amount equal to the accrued distributions from the grant date of the phantom units to be paid in cash upon the vesting date. Upon vesting, phantom unit awards may be settled, at the Partnership’s discretion, in cash and/or common units, but the current intention is to settle all phantom unit awards with common units.

The intrinsic value of phantom units that vested during the years ended December 31, follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Intrinsic value of vested LTIP awards	$	3,758	$	5,420

As of December 31, 2023, the unrecognized unit-based compensation related to the SMLP LTIP was $5.9 million. Incremental unit-based compensation will be recorded over the remaining weighted-average vesting period of approximately 0.98 years.

Unit-based compensation recognized in general and administrative expense related to awards under the SMLP LTIP follows.

	Year ended December 31,
	2023		2022
	(In thousands)
SMLP LTIP unit-based compensation	$	6,566	$	3,778

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LEASES

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

LEASES

16. LEASES

Leases. The Partnership leases certain office space and equipment under operating leases. The Partnership leases office space for terms of between 3 and 10 years. Office space leases limit exposure to risks related to ownership, such as fluctuations in real estate prices. The Partnership leases equipment primarily to support its operations in response to the needs of its gathering systems for terms of between 3 and 4 years. The Partnership also leases vehicles under finance leases to support its operations in response to the needs of its gathering systems for a term of 3 years.

Some of the Partnership’s leases are subject to annual escalations relating to the Consumer Price Index (“CPI”). While lease liabilities are not remeasured as a result of changes to the CPI, changes to the CPI are treated as variable lease payments and recognized in the period in which the obligation for those payments was incurred.

Significant assumptions or judgments include the determination of whether a contract contains a lease and the discount rate used in the lease liabilities.

The rate implicit in the lease contracts are not readily determinable. In determining the discount rate used for lease liabilities, the Partnership analyzed certain factors in its incremental borrowing rate, including collateral assumptions and the term used. The Partnership’s incremental borrowing rate was 6.43% at December 31, 2023, which reflects the rate at which the Partnership could borrow a similar amount, for a similar term and with similar collateral as in the lease contracts at the commencement date.

ROU assets (included in the other noncurrent assets caption on the Partnership’s consolidated balance sheet) and lease liabilities (included in the Other current liabilities and Other noncurrent liabilities captions on the Partnership’s consolidated balance sheet) follow:

	December 31, 2023		December 31, 2022
	(In thousands)
ROU assets
Operating	$	10,352	$	11,633
Finance	2,400		1,389
	$	12,752	$	13,022
Lease liabilities, current
Operating	$	3,341	$	2,570
Finance	870		435
	$	4,211	$	3,005
Lease liabilities, noncurrent
Operating	$	7,360	$	9,672
Finance	1,197		679
	$	8,557	$	10,351

Lease cost and Other information follow:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease cost
Finance lease cost:
Amortization of ROU assets (included in depreciation and amortization)	$	686	$	673
Interest on lease liabilities (included in interest expense)	62		18
Operating lease cost (included in general and administrative expense)	1,999		1,815
	$	2,747	$	2,506

	Year ended December 31,
	2023			2022
	(In thousands)
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash outflows from operating leases	$	3,975		$	1,732
Operating cash outflows from finance leases	62			18
Financing cash outflows from finance leases	610			330
ROU assets obtained in exchange for new operating lease liabilities	3,516			9,865
ROU assets obtained in exchange for new finance lease liabilities	1,238			1,298
Weighted-average remaining lease term (years) - operating leases	3.6			4.7
Weighted-average remaining lease term (years) - finance leases	2.5			2.4
Weighted-average discount rate - operating leases	6		%	6		%
Weighted-average discount rate - finance leases	5		%	3		%

The Partnership recognizes total lease expense incurred or allocated to us in general and administrative expenses. Lease expense related to operating leases, including lease expense incurred on the Partnership’s behalf and allocated to us, was as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease expense	$	5,898	$	3,162

Future minimum lease payments due under noncancelable leases at December 31, 2023, were as follows:

	December 31, 2023
	(In thousands)
	Operating		Finance
2024	$	4,067	$	870
2025	3,573		736
2026	2,468		374
2027	2,074		87
2028	61		—
2029	27		—
Thereafter	330		—
Total future minimum lease payments	$	12,600	$	2,067

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SEGMENT INFORMATION

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

SEGMENT INFORMATION

17. SEGMENT INFORMATION

As of December 31, 2023, the Partnership’s current reportable segments are:

•Rockies – Includes the Partnership’s wholly owned midstream assets located in the Williston Basin and the DJ Basin.

•Permian – Includes the Partnership’s equity method investment in Double E.

•Northeast – Includes the Partnership’s wholly owned midstream assets located in the Utica and Marcellus shale plays and the equity method investment in Ohio Gathering that is focused on the Utica Shale.

•Piceance – Includes the Partnership’s wholly owned midstream assets located in the Piceance Basin.

•Barnett – Includes the Partnership’s wholly owned midstream assets located in the Barnett Shale.

Corporate and Other represents those results that: (i) are not specifically attributable to a reportable segment; (ii) are not individually reportable; or (iii) have not been allocated to a reportable segments for the purpose of evaluating their performance, including certain general and administrative expense items, certain natural gas and crude oil marketing services and transaction costs.

Assets by reportable segment follow.

	December 31,
	2023		2022
	(in thousands)
Assets:
Northeast	$	573,663	$	591,091
Rockies	904,974		886,629
Permian	291,073		298,906
Piceance	431,687		475,719
Barnett	281,861		295,473
Total reportable segment assets	2,483,258		2,547,818
Corporate and Other	10,940		12,146
Total assets	$	2,494,198	$	2,559,964

Revenues by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Revenues:
Northeast	$	63,805	$	54,392
Rockies	255,031		143,603
Permian	3,570		25,151
Piceance	91,417		93,349
Barnett	45,117		52,096
Total reportable segments revenue	458,940		368,591
Corporate and Other	(37)		1,003
Total revenues	$	458,903	$	369,594

Counterparties accounting for a significant portion of total revenues were as follows:

	Year ended December 31,
	2023		2022
Percentage of total revenues:
Counterparty A - Piceance	10	%	13	%
Counterparty B - Rockies	13	%	*

________________________________________________________

* Less than 10% in the aggregate

Depreciation and amortization, including the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in other revenues, by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation and amortization:
Northeast	$	17,856	$	17,501
Rockies	36,148		30,532
Permian	—		2,736
Piceance	52,014		51,352
Barnett(1)	16,171		16,116
Total reportable segment depreciation and amortization	122,189		118,237
Corporate and Other	1,513		1,756
Total depreciation and amortization	$	123,702	$	119,993

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in Other revenues.

Cash paid for capital expenditures by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Cash paid for capital expenditures:
Northeast	$	4,695	$	8,743
Rockies	54,969		11,903
Permian	—		1,407
Piceance	4,544		6,116
Barnett	186		366
Total reportable segment capital expenditures	64,394		28,535
Corporate and Other	4,511		1,937
Total cash paid for capital expenditures	$	68,905	$	30,472

The Partnership assesses the performance of its reportable segments based on segment adjusted EBITDA. The Partnership defines segment adjusted EBITDA as total revenues less total costs and expenses; plus (i) other income excluding interest income, (ii) proportional adjusted EBITDA for equity method investees, (iii) depreciation and amortization, (iv) adjustments related to MVC shortfall payments, (v) adjustments related to capital reimbursement activity, (vi) unit-based and noncash compensation, (vii) impairments (vii) other noncash expenses or losses, less other noncash income or gains and (ix) restructuring expenses. Proportional adjusted EBITDA for the Partnership’s equity method investees is defined as the product of (i) total revenues less total expenses, excluding impairments and other noncash income or expense items, and amortization for deferred contract costs; and (ii) ownership interest in Ohio Gathering during the respective period.

For the purpose of evaluating segment performance, the Partnership excludes the effect of Corporate and Other revenues and expenses, such as certain general and administrative expenses (including compensation-related expenses and professional services fees), certain natural gas and crude oil marketing services, transaction costs, interest expense and income tax expense or benefit from segment adjusted EBITDA.

Segment adjusted EBITDA by reportable segment follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reportable segment adjusted EBITDA
Northeast	$	94,249	$	77,046
Rockies	87,390		57,810
Permian	24,207		18,051
Piceance	59,749		60,055
Barnett	26,171		31,624
Total of reportable segments' measures of profit	$	291,766	$	244,586

A reconciliation of income or loss before income taxes and income or loss from equity method investees to total of reportable segments' measures of profit or loss follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reconciliation of loss before income taxes and income from equity method investees to total of reportable segments' measures of profit:
Loss before income taxes and income from equity method investees	$	(72,454)	$	(141,277)
Add:
Corporate and Other expense	30,758		29,118
Interest expense	140,784		102,459
Loss on early extinguishment of debt	10,934		—
Depreciation and amortization(1)	123,702		119,993
Proportional adjusted EBITDA for equity method investees	61,070		45,419
Adjustments related to capital reimbursement activity	(9,874)		(6,041)
Unit-based and noncash compensation	6,566		3,778
Gain on asset sales, net	(260)		(507)
Long-lived asset impairment	540		91,644
Total of reportable segments' measures of profit	$	291,766	$	244,586

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable gas gathering contracts as reported in other revenues.

Contributions in aid of construction are recognized over the remaining term of the respective contract. The Partnership includes adjustments related to capital reimbursement activity in its calculation of segment adjusted EBITDA to account for revenue recognized from contributions in aid of construction.

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Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net loss attributable to Summit Midstream Partners, LP	$ (51,528)	$ (140,605)

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Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Presentation and Consolidation

The Partnership prepares its consolidated financial statements in accordance with GAAP as established by the FASB. The Partnership makes 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 revenues and expenses and the disclosure of commitments and contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.

The consolidated financial statements include the assets, liabilities and results of operations of SMLP and its subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. Comprehensive income or loss is the same as net income or loss for all periods presented.

Cash, Cash Equivalents and Restricted Cash

The Partnership considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. Cash that is held by a major bank and has restrictions on its availability to the Partnership is classified as restricted cash. The restricted cash balance of $2.6 million and $1.7 million at December 31, 2023 and 2022, respectively, is related to proceeds which are available to finance Permian Transmission’s debt service or other general corporate purposes of Permian Transmission. See Note 9 - Debt for additional information.

Accounts Receivable

Accounts receivable relate to gathering and other services provided to the Partnership’s customers and other counterparties. The Partnership evaluates the collectability of its accounts receivable and the need for an allowance for doubtful accounts based on customer-specific facts and circumstances. To the extent the collectability of a specific customer or counterparty receivable is doubtful, the Partnership recognizes an allowance for doubtful accounts. Uncollectible receivables are written off when a settlement is reached for an amount that is less than the outstanding historical balance or a receivable amount is deemed otherwise unrealizable.

Property, Plant and Equipment

The Partnership records property, plant and equipment at historical cost of construction or fair value of the assets at acquisition. The Partnership capitalizes expenditures that extend the useful life of an asset or enhance its productivity or efficiency from its original design over the expected remaining period of use. For maintenance and repairs that do not add capacity or extend the useful life of an asset, the Partnership recognizes expenditures as an expense as incurred. The Partnership capitalizes project costs incurred during construction, including interest on funds borrowed to finance the construction of facilities and pipelines, as construction in progress. Accrued capital expenditures are reflected in trade accounts payable.

The Partnership records depreciation on a straight-line basis over an asset’s estimated useful life and bases its estimates for useful life on various factors including age (in the case of acquired assets), manufacturing specifications, technological advances and historical data concerning useful lives of similar assets. Estimates of useful lives follow.

	Useful lives (In years)
Gathering and processing systems and related equipment	12-30
Other	3-15

Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Land and line fill are not depreciated.

The Partnership bases an asset’s carrying value on estimates, assumptions and judgments for useful life and salvage value. Upon sale, retirement or other disposal, the Partnership removes the carrying value of an asset and its accumulated depreciation from its balance sheet and recognizes the related gain or loss, if any.

Asset Retirement Obligations

The Partnership records a liability for asset retirement obligations only if and when a future asset retirement obligation with a determinable life is identified. For identified asset retirement obligations, the Partnership evaluates whether the expected retirement date and related costs of retirement can be estimated. The Partnership has concluded that its gathering and processing assets have an indeterminate life because they are owned and will operate for an indeterminate period when properly maintained. Because the Partnership does not have sufficient information to reasonably estimate the amount or timing of such obligations and does not have any current plan to discontinue use of any significant assets, the Partnership did not provide for any asset retirement obligations as of December 31, 2023 or 2022.

Amortizing Intangibles

The Partnership has certain acquired gas gathering contracts that had above-market pricing structures at the acquisition date and the Partnership amortizes these favorable contracts using a straight-line method over the contract’s estimated useful life. The Partnership defines useful life as the period over which the contract is expected to contribute to the Partnership’s future cash flows. These favorable contracts have original terms ranging from 10 years to 20 years and the Partnership recognizes the amortization expense associated with these contracts in Other revenues.

The Partnership amortizes all other gas gathering contracts, or contract intangibles, over the period of economic benefit based upon expected revenues over the life of the contract. The useful life of these contracts ranges from 3 years to 25 years. The Partnership recognizes the amortization expense associated with these contracts in Depreciation and amortization expense.

The Partnership also has rights-of-way associated with municipal easements and easements granted within existing rights-of-way. The Partnership amortizes these intangible assets over the shorter of the contractual term of the rights-of-way or the estimated useful life of the gathering system. The contractual terms of the rights-of-way range from 20 years to 30 years and the Partnership recognizes the amortization expense associated with these rights-of-way assets in Depreciation and amortization expense.

Equity Method Investments

The Partnership accounts for investments in which it exercises significant influence using the equity method so long as it (i) does not control the investee and (ii) is not the primary beneficiary. The Partnership reflects these investments in its consolidated balance sheets under the caption titled “investment in equity method investees.”

The Partnership recognizes an other-than-temporary impairment for losses in the value of equity method investees when evidence indicates that the carrying amount is no longer supportable. Evidence of a loss in value might include, but is not limited to, absence of an ability to recover the carrying amount of the investment or an inability of the equity method investee to sustain an earnings capacity that would justify the carrying amount of the investment. A current fair value of an investment that is less than its carrying amount may indicate a loss in value of the investment. The Partnership evaluates its equity method investments for impairment whenever a triggering event exists that would indicate a need to assess the investment for potential impairment.

Impairment of Long-Lived Assets

The Partnership tests assets for impairment when events or circumstances indicate the carrying value of a long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If the Partnership concludes that an asset’s carrying value will not be recovered through future cash flows, the Partnership recognizes an impairment loss on the long-lived asset equal to the amount by which the carrying value exceeds its fair value. The Partnership determines fair value using a combination of market-based and income-based approaches.

Environmental Matters

The Partnership is subject to various federal, state and local laws and regulations relating to the protection of the environment. 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. The Partnership accrues

for losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Such accruals are adjusted as further information develops or circumstances change. Recoveries of environmental remediation costs from other parties or insurers are recorded as assets when their realization is assured beyond a reasonable doubt.

Commitments and Contingencies

When required, the Partnership records accruals for loss contingencies in accordance with FASB ASC 450, Contingencies. Such determinations are subject to interpretations of current facts and circumstances, forecasts of future events and estimates of the financial impacts of such events.

Mezzanine Capital

A noncontrolling interest is reported as a component of equity unless the noncontrolling interest is considered redeemable, in which case the noncontrolling interest is recorded between liabilities and equity (mezzanine or temporary equity) in the Partnership’s consolidated balance sheet.

Revenue Recognition

The Partnership provides gathering and/or processing services principally under contracts that contain one or more of the following arrangements described below:

•Fee-based arrangements. Under fee-based arrangements, the Partnership receives a fee or fees for one or more of the following services (i) natural gas gathering, treating, transporting, compressing and/or processing and (ii) crude oil and/or produced water gathering and (iii) fresh water delivery services.

•Percent-of-proceeds arrangements. Under percent-of-proceeds arrangements, the Partnership generally purchases natural gas from producers at the wellhead, or other receipt points, gathers the wellhead natural gas through its gathering system, treats and compresses the natural gas, processes the natural gas and/or sells the natural gas to a third party for processing. The Partnership then remits to its producers an agreed-upon percentage of the actual proceeds received from sales of the residue natural gas and NGLs. Certain of these arrangements may also result in returning all or a portion of the residue natural gas and/or the NGLs to the producer, in lieu of returning sales proceeds. The margins earned are directly related to the volume of natural gas that flows through the system and the price at which the Partnership is able to sell the residue natural gas and NGLs.

The majority of the Partnership’s contracts have a single performance obligation which is either to provide gathering services (an integrated service) or sell natural gas, NGLs and condensate, which are both satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. The Partnership also has certain contracts with multiple performance obligations. They include an option for the customer to acquire additional services such as contracts containing MVCs. These performance obligations would also be satisfied when the related natural gas, crude oil and produced water are received and transferred to an agreed upon delivery point. In these instances, the Partnership allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each service in the contract.

Performance obligations for gathering services are generally satisfied over time. The Partnership utilizes either an output method (i.e., measure of progress) for guaranteed, stand-ready service contracts or an asset/system delivery time estimate for non-guaranteed, as-available service contracts.

Performance obligations for the sale of natural gas, NGLs and condensate are satisfied at a point in time. There are no significant judgments for these transactions because the customer obtains control based on an agreed upon delivery point.

Services are typically billed on a monthly basis and the Partnership does not offer extended payment terms. The Partnership does not have contracts with financing components.

For the contracts described above, the Partnership reflects its revenues in the financial statement captions described below.

Financial statement caption:	Revenue description:
Revenues:
Gathering services and related fees	•Revenue earned from fee-based gathering, compression, treating and processing services;
Natural gas, NGLs and condensate sales	•Revenue from the sale of physical natural gas purchased from customers percent-of- proceeds arrangements (Costs are presented within cost of natural gas and NGLs); •Revenue from sale of condensate and NGLs retained from gathering services (Costs are presented within operation and maintenance expense);
Other revenues	•Reimbursements to the Partnership for costs incurred by the Partnership on customer’s behalf (Recorded on a gross basis with corresponding costs included in operations and maintenance expense); •Revenue for freshwater deliveries; •Contract amortization; and •Revenue for management fees related to Double E.

Certain of the Partnership’s gathering and/or processing agreements provide for monthly MVCs. Under these MVCs, customers agree to ship and/or process a minimum volume of production on its 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 the Partnership at the end of the contracted measurement period if its actual throughput volumes are less than its contractual MVC for that period. Certain customers are entitled to utilize shortfall payments to offset gathering fees in one or more subsequent contracted measurement periods to the extent that such customers throughput volumes in a subsequent contracted measurement period exceed its MVC for that contracted measurement period. The amount of the shortfall payment is based on the difference between the actual throughput volume shipped and/or processed for the applicable period and the MVC for the applicable period, multiplied by the applicable gathering or processing fee.

Many of the Partnership’s gas gathering agreements contain provisions that can reduce or delay the cash flows that it expects to receive from MVCs to the extent that a customer's actual throughput volumes are above or below its MVC for the applicable contracted measurement period. These provisions include the following: 

•To the extent that a customer's throughput volumes are less than its MVC for the applicable period and the customer makes a shortfall payment, it may be entitled to an offset in one or more subsequent periods to the extent that its throughput volumes in subsequent periods exceed its MVC for those periods. In such a situation, the Partnership would not receive gathering fees on throughput in excess of that customer's MVC (depending on the terms of the specific gas gathering agreement) to the extent that the customer had made a shortfall payment with respect to one or more preceding measurement periods (as applicable).

•To the extent that a customer's throughput volumes exceed its MVC in the applicable contracted measurement period, it may be entitled to apply the excess throughput against its aggregate MVC, thereby reducing the period for which its annual MVC applies. As a result of this mechanism, the weighted-average remaining period for which the Partnership’s MVCs apply will be less than the weighted-average of the originally stated MVC contractual terms.

•To the extent that certain of the Partnership’s customers' throughput volumes exceed its MVC for the applicable period, there is a crediting mechanism that allows the customer to build a bank of credits that it can utilize in the future to reduce shortfall payments owed in subsequent periods, subject to expiration if there is no shortfall in subsequent periods. The period over which this credit bank can be applied to future shortfall payments varies, depending on the particular gas gathering agreement.

The Partnership recognizes customer obligations under their MVCs as revenue and contract assets when (i) it considers it remote that the customer will utilize shortfall payments to offset gathering or processing fees in excess of its MVCs in subsequent periods; (ii) the customer incurs a shortfall in a contract with no banking mechanism or claw back provision; (iii) the customer’s banking mechanism has expired; or (iv) it is remote that the customer will use its unexercised right. In making

this determination, the Partnership considers both quantitative and qualitative facts and circumstances, including, but not limited to, contract terms, capacity of the associated pipeline or receipt point and/or expectations regarding future investment, drilling and production.

The majority of the Partnership’s revenue is derived from long-term, fee-based contracts with its customers, which include original terms of up to 25 years. The Partnership recognizes revenue earned from fee-based gathering, compression, treating and processing services in gathering services and related fees. The Partnership also earns revenue in the Rockies and Piceance reporting segments from the sale of physical natural gas purchased from its customers under certain percent-of-proceeds arrangements. Under ASC Topic 606, these gathering contracts are presented net within cost of natural gas and NGLs. The Partnership sells natural gas that it retains from certain customers in the Barnett reporting segment to offset the power expenses, included in operations and maintenance expense, of the electric-driven compression on the gathering system. The Partnership also sells condensate and NGLs retained from certain of its gathering services in the Piceance and Rockies reporting segments. Revenues from the sale of natural gas and condensate are recognized in Natural gas, NGLs and condensate sales; the associated expense is included in Operation and maintenance expense. Certain customers reimburse the Partnership for costs incurred on their behalf. The Partnership records costs incurred and reimbursed by its customers on a gross basis, with the revenue component recognized in Other revenues and the associated expense included in operations and maintenance expense.

The transaction price in the Partnership’s contracts is primarily based on the volume of natural gas, crude oil or produced water transferred by its gathering systems to the customer’s agreed upon delivery point multiplied by the contractual rate. For contracts that include MVCs, variable consideration up to the MVC will be included in the transaction price. For contracts that do not include MVCs, the Partnership does not estimate variable consideration because the performance obligations are completed and settled on a daily basis. For contracts containing noncash consideration such as fuel received in-kind, the Partnership measures the transaction price at the point of sale when the volume, mix and market price of the commodities are known.

The Partnership has contracts with MVCs that are variable and constrained. Contracts with longer than monthly MVCs are reviewed on a quarterly basis and adjustments to those estimates are made during each respective reporting period, if necessary.

The transaction price is allocated if the contract contains more than one performance obligation such as contracts that include MVCs. The transaction price allocated is based on the MVC for the applicable measurement period.

Unit-Based Compensation

For awards of unit-based compensation, the Partnership determines a grant date fair value and recognizes the related compensation expense in the statements of operations over the vesting period for each respective award.

Income Taxes

The Partnership is generally not subject to federal and state income taxes, except as noted below. However, its unitholders are individually responsible for paying federal and state income taxes on their share of its taxable income. Net income or loss for GAAP purposes may differ significantly from taxable income reportable to its unitholders as a result of differences between the tax basis and the GAAP basis of assets and liabilities and the taxable income allocation requirements of the Partnership’s governing documents. The aggregate difference in the basis of the Partnership’s net assets for financial and income tax purposes cannot be readily determined as the Partnership does not have access to the information about each partner’s tax attributes related to the Partnership.

In general, legal entities that are chartered, organized or conducting business in the state of Texas are subject to a 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. The Partnership’s financial statements reflect provisions for these tax obligations.

Interest Rate Swaps

Interest rate swap agreements are reported as either assets or liabilities on the consolidated balance sheet at fair value. Interest rate swap agreements are not designated as cash-flow hedges, and accordingly, the changes in the fair value are recorded in earnings. The Partnership does not use interest rate swap agreements for speculative purposes.

Accounting standards recently implemented. and New Accounting Standards Implemented in this Annual Report

Accounting standards recently implemented. ASU No. 2020-4 Reference Rate Reform (“ASU 2020-4”). ASU 2020-4 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform on financial reporting. Contract terms that are modified due to the replacement of a reference rate are not required to be remeasured or reassessed under relevant accounting standards. During the quarter ended June 30, 2023, the Partnership amended the terms of its Permian Transmission Credit Facility and Term Loan and interest rate swaps, which replaced its existing LIBOR based terms with SOFR rate terms. The amendments in ASU 2020-4 are effective as of March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU 2022-06, which amended Topic 848 to defer the sunset date to apply the practical expedients until December 31, 2024. The impact of the change in reference rate did not have a material impact on the Partnership’s consolidated financial statements. See Note 9 - Debt, for additional information.

New accounting standards not yet implemented in this Annual Report. ASU No. 2020-06 Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815 – 40) (“ASU 2020-06”). ASU 2020-06 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The ASU is part of the FASB’s simplification initiative, which aims to reduce unnecessary complexity in GAAP. The ASU’s amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. The Partnership does not expect the provisions of ASU 2020-06 will have a material impact on its consolidated financial statements and disclosures.

ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 enhances disclosures on reportable segments and provides additional detailed information about significant segment expenses. The guidance in ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Partnership continues to assess the impact of the new guidance, but does not expect the provisions of ASU 2023-07 will have a material impact on its consolidated financial statements and disclosures.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Useful lives of Property, Plant and Equipment

Estimates of useful lives follow.

	Useful lives (In years)
Gathering and processing systems and related equipment	12-30
Other	3-15

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ACQUISTIONS AND DIVESTITURES (Tables)

12 Months Ended

Dec. 31, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule of Fair Value of the Assets and Liabilities Acquired

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Outrigger DJ Acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Outrigger DJ	$	167,631
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	1,000
Accounts receivable	7,529
Other current assets	190
Property, plant and equipment, net	144,514
Intangible assets	21,447
Trade accounts payable, accrued expenses and other	(7,049)
Net assets acquired and liabilities assumed	$	167,631

The following table sets forth the preliminary fair value of the assets acquired and liabilities assumed as of the acquisition date. There were no material changes made during 2023 to the provisional purchase accounting measurements initially recorded in December 2022 for the Sterling DJ acquisition. The purchase price allocation was complete as of the fourth quarter of 2023.

(in thousands)
Total consideration paid for Sterling DJ	$	140,396
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	500
Accounts receivable	16,224
Other current assets	4,557
Property, plant and equipment, net	108,720
Intangible assets	38,678
Other noncurrent assets	9,865
Trade accounts payable, accrued expenses and other	(38,148)
Net assets acquired	$	140,396

Schedule of Pro Forma Information

The following table summarizes the unaudited pro forma condensed financial information of SMLP as if the acquisitions of Outrigger DJ and Sterling DJ, along with the dispositions of Bison Midstream and the Lane G&P System, had occurred on January 1, 2021:

	Year Ended December 31, 2022
Revenues	$	543,024
Net loss	$	(36,945)

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REVENUE (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Estimated Revenue Expected to be Recognized and MVC Shortfall Payments

The following table presents estimated revenue expected to be recognized over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated MVC shortfall payments.

The Partnership applies the practical expedient in paragraph 606-10-50-14 of Topic 606 for certain arrangements that are considered optional purchases (i.e., there is no enforceable obligation for the customer to make purchases) and those amounts are therefore excluded from the table.

	2024		2025		2026		2027		2028		Thereafter
	(in thousands)
Gathering services and related fees	$	65,472	$	45,594	$	29,292	$	7,685	$	5,137	$	—

Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments

In the following table, revenue is disaggregated by geographic area and major products and services. For more detailed information about reportable segments, see Note 17 -Segment Information.

	Year ended December 31, 2023
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	63,805	$	—	$	—	$	63,805
Rockies	65,869		173,688		15,474		255,031
Permian	—		—		3,570		3,570
Piceance	81,041		4,788		5,588		91,417
Barnett	37,508		778		6,831		45,117
Total reportable segments	248,223		179,254		31,463		458,940
Corporate and other	—		—		(37)		(37)
Total	$	248,223	$	179,254	$	31,426	$	458,903

	Year ended December 31, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Northeast	$	54,392	$	—	$	—	$	54,392
Rockies	67,838		59,208		16,557		143,603
Permian	3,668		17,382		4,101		25,151
Piceance	80,630		7,111		5,608		93,349
Barnett	41,830		2,503		7,763		52,096
Total reportable segments	248,358		86,204		34,029		368,591
Corporate and other	—		21		982		1,003
Total	$	248,358	$	86,225	$	35,011	$	369,594

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PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, and Equipment, Net

Details on the Partnership’s property, plant and equipment follow.

	December 31, 2023		December 31, 2022
	(In thousands)
Gathering and processing systems and related equipment	$	2,335,980	$	2,262,330
Construction in progress	56,064		59,036
Land and line fill	11,534		11,756
Other	65,029		62,222
Total	2,468,607		2,395,344
Less accumulated depreciation	(770,022)		(676,590)
Property, plant and equipment, net	$	1,698,585	$	1,718,754

Schedule of Depreciation Expense and Capitalized Interest Costs

Depreciation expense and capitalized interest for the Partnership follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation expense	$	95,307	$	93,457
Capitalized interest	1,284		838

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INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Liabilities Subject to Amortization

Details regarding the Partnership’s intangible assets follow.

	December 31, 2023
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(15,747)	$	5,316
Contract intangibles	270,412		(247,024)		23,388
Rights-of-way	205,358		(66,906)		138,452
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	505,269	$	(329,677)	$	175,592

	December 31, 2022
	Gross carrying amount		Accumulated amortization		Net
	(In thousands)
Favorable gas gathering contracts	$	21,063	$	(14,809)	$	6,254
Contract intangibles	270,412		(228,143)		42,269
Rights-of-way	200,089		(58,330)		141,759
Indefinite-lived intangibles	8,436		—		8,436
Total intangible assets	$	500,000	$	(301,282)	$	198,718

Schedule of Recognized Amortization Expense in Other Revenues and Cost and Expenses

The Partnership recognized amortization expense of its favorable gas gathering contracts in Other revenues as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – favorable gas gathering contracts	$	938	$	938

The Partnership recognized amortization expense of its contract and right of way intangibles in costs and expenses as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Amortization expense – contract intangibles	$	18,881	$	18,935
Amortization expense – rights-of-way	8,576		6,527

Schedule of Estimated Aggregate Annual Amortization Expected to be Recognized

The Partnership’s estimated aggregate annual amortization expected to be recognized for each of the five succeeding fiscal years and thereafter, as of December 31, 2023, follows.

	(In thousands)
2024	$	18,076
2025	17,892
2026	14,867
2027	8,878
2028	8,711
Thereafter	98,732
	$	167,156

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EQUITY METHOD INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

Details of the Partnership’s equity method investments follows.

	December 31, 2023		December 31, 2022
	(In thousands)
Double E (1)	$	276,221	$	281,640
Ohio Gathering	210,213		225,037
Total	$	486,434	$	506,677

(1) The Partnership’s investment balance in Double E includes capitalized interest costs.

Summarized balance sheet information for Double E follows (amounts represent 100% of investee financial information).

	December 31, 2023		December 31, 2022
	(In thousands)
Current assets	$	11,410	$	5,121
Noncurrent assets	391,777		403,594
Total assets	$	403,187	$	408,715
Current liabilities	$	6,373	$	8,635
Noncurrent liabilities	13,727		9,137
Total liabilities	$	20,100	$	17,772

Summarized statements of operations information for Double E follows (amounts represent 100% of investee financial information).

	Year Ended December 31, 2023		Year Ended December 31, 2022
	(In thousands)
Total revenues	$	42,335	$	32,418
Total operating expenses	26,868		25,685
Net income	$	15,467	$	6,733

A reconciliation of the difference between the carrying amount of the Partnership’s interest in Ohio Gathering and the Partnership’s underlying investment in Ohio Gathering, per Ohio Gathering’s books and records, is shown below.

	2023		2022
	(In thousands)
Investment in Ohio Gathering, December 31	$	210,213	$	225,037
December cash distributions	3,950		2,673
Basis difference (1)	190,600		199,263
Investment in Ohio Gathering (Books and records), November 30,	$	404,763	$	426,973

(1) Amount consists of differences created as a result of equity method impairment charges previously recognized which are being amortized over the remaining average life of the underlying assets.

Summarized balance sheet information for OGC and OCC follows (amounts represent 100% of investee financial information).

	November 30, 2023				November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Current assets	$	42,716	$	5,885	$	36,062	$	5,195
Noncurrent assets	1,131,503		1,104		1,157,530		274
Total assets	$	1,174,219	$	6,989	$	1,193,592	$	5,469
Current liabilities	$	6,174	$	3,736	$	6,942	$	3,588
Noncurrent liabilities	14,088		1,149		13,380		3,096
Total liabilities	$	20,262	$	4,885	$	20,322	$	6,684

Summarized statements of operations information for OGC and OCC follows (amounts represent 100% of investee financial information).

	Twelve Months Ended November 30, 2023				Twelve Months Ended November 30, 2022
	OGC		OCC		OGC		OCC
	(In thousands)
Total revenues	$	138,707	$	15,603	$	113,317	$	13,340
Total operating expenses	99,770		12,285		106,369		12,786
Net income	38,937		3,318		6,948		554

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DEFERRED REVENUE (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Rollforward Deferred Revenue

An update of current deferred revenue is as follows.

	(In thousands)
Current deferred revenue, January 1, 2023	$	9,054
Additions	10,970
Less: revenue recognized and other	(9,828)
Current deferred revenue, December 31, 2023	$	10,196

An update of noncurrent deferred revenue follows.

	(In thousands)
Noncurrent deferred revenue, January 1, 2023	$	37,694
Additions	2,951
Less: reclassification to current deferred revenue and other	(10,560)
Noncurrent deferred revenue, December 31, 2023	$	30,085

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DEBT (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Debt

Debt for the Partnership at December 31, 2023 and 2022 follows.

	December 31, 2023		December 31, 2022
	(In thousands)
ABL Facility: Summit Holdings’ asset based credit facility due May 1, 2026	$	313,000	$	330,000
Permian Transmission Term Loan: Permian Transmission’ variable rate senior secured term loan due January 2028	144,846		155,353
2026 Unsecured Notes: 12.00% senior unsecured notes due October 15, 2026	209,510		—
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025	49,783		259,463
2026 Secured Notes: 8.50% senior second lien notes due October 15, 2026	785,000		785,000
Less: unamortized debt discount and debt issuance costs	(31,449)		(39,454)
Total debt, net of unamortized debt discount and debt issuance costs	1,470,690		1,490,362
Less: current portion of Permian Transmission Term Loan	(15,524)		(10,507)
Total long-term debt	$	1,455,166	$	1,479,855

Schedule of Maturities of Long-Term Debt

The aggregate amount of Partnership’s debt maturing during each of the years after December 31, 2023 are as follows (in thousands):

2024	$	15,524
2025	66,363
2026	1,324,477
2027	17,769
2028	78,006
Thereafter	—
Total debt	$	1,502,139

Below is a summary of the remaining mandatory principal repayments as of December 31, 2023:

(In thousands)	Total		2024		2025		2026		2027		2028
Amortizing principal repayments	$	144,846	$	15,524	$	16,580	$	16,967	$	17,769	$	78,006

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of Accrued Environmental Remediation

An update of the Partnership’s undiscounted accrued environmental remediation is as follows and is primarily related to the 2015 Blacktail Release and other environmental remediation activities, as described below.

	(In thousands)
Accrued environmental remediation, December 31, 2021	$	5,606
Payments made	(2,746)
Additional accruals	845
Accrued environmental remediation, December 31, 2022	$	3,705
Payments made	(641)
Changes in estimates	(127)
Accrued environmental remediation, December 31, 2023	$	2,937

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FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Value of Debt Instruments

A summary of the estimated fair value of the Partnership’s debt financial instruments follows.

	December 31, 2023				December 31, 2022
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(in thousands)
2025 Senior Notes	$	49,783	$	48,414	$	259,463	$	221,733
2026 Secured Notes	$	785,000	$	778,131	$	785,000	$	750,983
2026 Unsecured Notes	$	209,510	$	203,225	$	—	$	—

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

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PARTNERS' CAPITAL AND MEZZANINE CAPITAL (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Partner Units Activity

An update on the number of common units is as follows for the period from December 31, 2021 to December 31, 2023.

	Common Units
December 31, 2021	7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes	2,853,875
Common units issued for SMLP LTIP, net	159,054
December 31, 2022	10,182,763
Common units issued for SMLP LTIP, net	193,426
December 31, 2023	10,376,189

A rollforward of the number of outstanding Series A Preferred Units follows for the period from December 31, 2021 to December 31, 2023.

	Series A Preferred Units
December 31, 2021	143,447
2022 Preferred Exchange Offer	(77,939)
December 31, 2022	65,508
2023 activity	—
December 31, 2023	65,508

Schedule of Change in Subsidiary

The following table shows the change in the Partnership’s Subsidiary Series A Preferred Unit balance from January 1, 2022 through December 31, 2023, net of $1.7 million and $2.2 million of unamortized issuance costs at December 31, 2023 and December 31, 2022, respectively:

	(in thousands)
Balance at January 1, 2022	$	106,325
PIK distributions	1,600
Redemption accretion, net of issuance cost amortization	15,544
Cash distribution (includes $1.6 million distributions payable as of December 31, 2022)	(4,885)
Balance at December 31, 2022	$	118,584
Redemption accretion, net of issuance cost amortization	12,581
Cash distribution (includes $1.6 million distributions payable as of December 31, 2023)	(6,513)
Balance at December 31, 2023	$	124,652

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EARNINGS PER UNIT (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Schedule of Earnings Per Limited Partner Unit

The following table details the components of EPU.

	Year ended December 31,
	2023		2022
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net loss	$	(38,947)	$	(123,461)
Less: Net income attributable to Subsidiary Series A Preferred Units	(12,581)		(17,144)
Net loss attributable Summit Midstream Partners, LP	(51,528)		(140,605)
Less: Net income attributable to Series A Preferred Unit	(11,566)		(8,048)
Add: Deemed capital contribution	—		20,974
Net loss attributable to common limited partners	$	(63,094)	$	(127,679)
Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	10,334		10,048
Effect of nonvested phantom units	—		—
Weighted-average common units outstanding – diluted	10,334		10,048
Net Loss per limited partner unit:
Common unit – basic	$	(6.11)	$	(12.71)
Common unit – diluted	$	(6.11)	$	(12.71)
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	245		177

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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

12 Months Ended

Dec. 31, 2023

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Cash Flow Information

	Year ended December 31,
	2023		2022
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	127,022	$	89,472
Cash paid for taxes	15		149
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	11,612	$	6,724
2025 Senior Notes Exchange	180,030		—
Accretion of Subsidiary Series A Preferred Units	12,581		15,544
Right-of-use assets acquired in connection with Sterling DJ acquisition	—		9,865
2022 Preferred Exchange Offer	—		92,587

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UNIT-BASED AND NONCASH COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Activity

The following table presents phantom unit activity for the periods presented:

	Units	Weighted-average grant date fair value
Nonvested phantom units, December 31, 2021	333,779	$	21.78
Phantom units granted	509,631	17.70
Phantom units vested	(229,551)	23.61
Phantom units forfeited	(8,717)	22.53
Nonvested phantom units, December 31, 2022	605,142	17.62
Phantom units granted	323,371	17.29
Phantom units vested	(236,154)	15.69
Phantom units forfeited	(3,892)	20.50
Nonvested phantom units, December 31, 2023	688,467	$	17.69

Schedule of Intrinsic Values

The intrinsic value of phantom units that vested during the years ended December 31, follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Intrinsic value of vested LTIP awards	$	3,758	$	5,420

Schedule of Unit-Based Compensation Recognized in General and Administrative Expense

Unit-based compensation recognized in general and administrative expense related to awards under the SMLP LTIP follows.

	Year ended December 31,
	2023		2022
	(In thousands)
SMLP LTIP unit-based compensation	$	6,566	$	3,778

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LEASES (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Schedule of Right-Of-Use Assets and Lease Liabilities

ROU assets (included in the other noncurrent assets caption on the Partnership’s consolidated balance sheet) and lease liabilities (included in the Other current liabilities and Other noncurrent liabilities captions on the Partnership’s consolidated balance sheet) follow:

	December 31, 2023		December 31, 2022
	(In thousands)
ROU assets
Operating	$	10,352	$	11,633
Finance	2,400		1,389
	$	12,752	$	13,022
Lease liabilities, current
Operating	$	3,341	$	2,570
Finance	870		435
	$	4,211	$	3,005
Lease liabilities, noncurrent
Operating	$	7,360	$	9,672
Finance	1,197		679
	$	8,557	$	10,351

Schedule of Lease Cost and Other Information

Lease cost and Other information follow:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease cost
Finance lease cost:
Amortization of ROU assets (included in depreciation and amortization)	$	686	$	673
Interest on lease liabilities (included in interest expense)	62		18
Operating lease cost (included in general and administrative expense)	1,999		1,815
	$	2,747	$	2,506

	Year ended December 31,
	2023			2022
	(In thousands)
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash outflows from operating leases	$	3,975		$	1,732
Operating cash outflows from finance leases	62			18
Financing cash outflows from finance leases	610			330
ROU assets obtained in exchange for new operating lease liabilities	3,516			9,865
ROU assets obtained in exchange for new finance lease liabilities	1,238			1,298
Weighted-average remaining lease term (years) - operating leases	3.6			4.7
Weighted-average remaining lease term (years) - finance leases	2.5			2.4
Weighted-average discount rate - operating leases	6		%	6		%
Weighted-average discount rate - finance leases	5		%	3		%

The Partnership recognizes total lease expense incurred or allocated to us in general and administrative expenses. Lease expense related to operating leases, including lease expense incurred on the Partnership’s behalf and allocated to us, was as follows:

	Year ended December 31,
	2023		2022
	(In thousands)
Lease expense	$	5,898	$	3,162

Schedule of Future Minimum Lease Payments Due and Future Minimum Rentals to be Received Under Noncancelable Leases and Subleases

Future minimum lease payments due under noncancelable leases at December 31, 2023, were as follows:

	December 31, 2023
	(In thousands)
	Operating		Finance
2024	$	4,067	$	870
2025	3,573		736
2026	2,468		374
2027	2,074		87
2028	61		—
2029	27		—
Thereafter	330		—
Total future minimum lease payments	$	12,600	$	2,067

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SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Assets by Reportable Segment

Assets by reportable segment follow.

	December 31,
	2023		2022
	(in thousands)
Assets:
Northeast	$	573,663	$	591,091
Rockies	904,974		886,629
Permian	291,073		298,906
Piceance	431,687		475,719
Barnett	281,861		295,473
Total reportable segment assets	2,483,258		2,547,818
Corporate and Other	10,940		12,146
Total assets	$	2,494,198	$	2,559,964

Schedule of Segment Reporting Information

Revenues by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Revenues:
Northeast	$	63,805	$	54,392
Rockies	255,031		143,603
Permian	3,570		25,151
Piceance	91,417		93,349
Barnett	45,117		52,096
Total reportable segments revenue	458,940		368,591
Corporate and Other	(37)		1,003
Total revenues	$	458,903	$	369,594

Depreciation and amortization, including the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in other revenues, by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Depreciation and amortization:
Northeast	$	17,856	$	17,501
Rockies	36,148		30,532
Permian	—		2,736
Piceance	52,014		51,352
Barnett(1)	16,171		16,116
Total reportable segment depreciation and amortization	122,189		118,237
Corporate and Other	1,513		1,756
Total depreciation and amortization	$	123,702	$	119,993

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable and unfavorable gas gathering contracts as reported in Other revenues.

Cash paid for capital expenditures by reportable segment follow.

	Year ended December 31,
	2023		2022
	(In thousands)
Cash paid for capital expenditures:
Northeast	$	4,695	$	8,743
Rockies	54,969		11,903
Permian	—		1,407
Piceance	4,544		6,116
Barnett	186		366
Total reportable segment capital expenditures	64,394		28,535
Corporate and Other	4,511		1,937
Total cash paid for capital expenditures	$	68,905	$	30,472

Schedule of Counterparties Accounting for More than 10% of Total Revenues

Counterparties accounting for a significant portion of total revenues were as follows:

	Year ended December 31,
	2023		2022
Percentage of total revenues:
Counterparty A - Piceance	10	%	13	%
Counterparty B - Rockies	13	%	*

________________________________________________________

* Less than 10% in the aggregate

Schedule of Reconciliation of Net Income to Adjusted EBITDA

Segment adjusted EBITDA by reportable segment follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reportable segment adjusted EBITDA
Northeast	$	94,249	$	77,046
Rockies	87,390		57,810
Permian	24,207		18,051
Piceance	59,749		60,055
Barnett	26,171		31,624
Total of reportable segments' measures of profit	$	291,766	$	244,586

A reconciliation of income or loss before income taxes and income or loss from equity method investees to total of reportable segments' measures of profit or loss follows.

	Year ended December 31,
	2023		2022
	(In thousands)
Reconciliation of loss before income taxes and income from equity method investees to total of reportable segments' measures of profit:
Loss before income taxes and income from equity method investees	$	(72,454)	$	(141,277)
Add:
Corporate and Other expense	30,758		29,118
Interest expense	140,784		102,459
Loss on early extinguishment of debt	10,934		—
Depreciation and amortization(1)	123,702		119,993
Proportional adjusted EBITDA for equity method investees	61,070		45,419
Adjustments related to capital reimbursement activity	(9,874)		(6,041)
Unit-based and noncash compensation	6,566		3,778
Gain on asset sales, net	(260)		(507)
Long-lived asset impairment	540		91,644
Total of reportable segments' measures of profit	$	291,766	$	244,586

______________________________________

(1)Includes the amortization expense associated with the Partnership’s favorable gas gathering contracts as reported in other revenues.

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Line Items]
Restricted cash	$ 2,601	$ 1,723
Original terms (in years)	25 years
Favorable gas gathering contracts | Minimum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	10 years
Favorable gas gathering contracts | Maximum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	20 years
Other Gas Gathering Contract | Minimum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	3 years
Other Gas Gathering Contract | Maximum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	25 years
Rights-of-way | Minimum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	20 years
Rights-of-way | Maximum
Summary of Significant Accounting Policies [Line Items]
Useful lives (In years)	30 years

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP - Property, Plant and Equipment (Details)	Dec. 31, 2023
Gathering and processing systems and related equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful lives (In years)	12 years
Gathering and processing systems and related equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful lives (In years)	30 years
Other | Minimum
Property, Plant and Equipment [Line Items]
Useful lives (In years)	3 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Useful lives (In years)	15 years

XML

ACQUISTIONS AND DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Lane G&P System
Business Acquisition [Line Items]
Proceeds from sale of business, net of cash sold in transaction		$ 0	$ 75,020
Bison Midstream, LLC
Business Acquisition [Line Items]
Proceeds from sale of business, net of cash sold in transaction		$ 0	38,920
Disposal, not discontinued operations | Lane G&P System
Business Acquisition [Line Items]
Impairment on disposition			84,500
Proceeds from sale of business, net of cash sold in transaction			75,000
Cash sold, working capital and other miscellaneous adjustments			2,000
Net book value of assets and liabilities divested			158,300
Other costs to sell			1,200
Disposal, not discontinued operations | Bison Midstream, LLC
Business Acquisition [Line Items]
Impairment on disposition			6,900
Proceeds from sale of business, net of cash sold in transaction			38,900
Net book value of assets and liabilities divested			$ 45,800
Outrigger DJ
Business Acquisition [Line Items]
Ownership interest (as a percent)	100.00%
Cash paid to acquire investment	$ 165,000
Intangible assets acquired	$ 21,447
Weighted average amortization period	30 years
Outrigger DJ | Rights-Of-Way Intangibles
Business Acquisition [Line Items]
Intangible assets acquired	$ 21,400
Sterling DJ
Business Acquisition [Line Items]
Ownership interest (as a percent)	100.00%
Cash paid to acquire investment	$ 140,000
Intangible assets acquired	$ 38,678
Weighted average amortization period	30 years
Sterling DJ | Rights-Of-Way Intangibles
Business Acquisition [Line Items]
Intangible assets acquired	$ 30,200
Sterling DJ | Water Rights Intangibles
Business Acquisition [Line Items]
Intangible assets acquired	$ 8,400

XML

ACQUISTIONS AND DIVESTITURES - Schedule of Fair Value of the Assets and Liabilities Acquired (Details) $ in Thousands	Dec. 01, 2022 USD ($)
Outrigger DJ
Business Acquisition [Line Items]
Consideration paid	$ 167,631
Cash	1,000
Accounts receivable	7,529
Other current assets	190
Property, plant and equipment, net	144,514
Intangible assets	21,447
Trade accounts payable, accrued expenses and other	(7,049)
Net assets acquired and liabilities assumed	167,631
Sterling DJ
Business Acquisition [Line Items]
Consideration paid	140,396
Cash	500
Accounts receivable	16,224
Other current assets	4,557
Property, plant and equipment, net	108,720
Intangible assets	38,678
Other noncurrent assets	9,865
Trade accounts payable, accrued expenses and other	(38,148)
Net assets acquired and liabilities assumed	$ 140,396

XML

ACQUISTIONS AND DIVESTITURES - Schedule of Pro Forma Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 543,024
Net loss	$ (36,945)

XML

REVENUE - Schedule of Estimated Revenue Expected to be Recognized (Details) - Gathering services and related fees $ in Thousands	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 65,472
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 45,594
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 29,292
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 7,685
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 5,137
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Revenue, remaining performance obligation, expected timing of satisfaction, Period	1 year

XML

REVENUE - Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 458,903	$ 369,594
Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	(37)	1,003
Gathering services and related fees
Disaggregation of Revenue [Line Items]
Total revenues	248,223	248,358
Gathering services and related fees | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Natural gas, NGLs and condensate sales
Disaggregation of Revenue [Line Items]
Total revenues	179,254	86,225
Natural gas, NGLs and condensate sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	0	21
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	31,426	35,011
Other revenues | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	(37)	982
Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	458,940	368,591
Reportable Segments | Northeast
Disaggregation of Revenue [Line Items]
Total revenues	63,805	54,392
Reportable Segments | Rockies
Disaggregation of Revenue [Line Items]
Total revenues	255,031	143,603
Reportable Segments | Permian
Disaggregation of Revenue [Line Items]
Total revenues	3,570	25,151
Reportable Segments | Piceance
Disaggregation of Revenue [Line Items]
Total revenues	91,417	93,349
Reportable Segments | Barnett
Disaggregation of Revenue [Line Items]
Total revenues	45,117	52,096
Reportable Segments | Gathering services and related fees
Disaggregation of Revenue [Line Items]
Total revenues	248,223	248,358
Reportable Segments | Gathering services and related fees | Northeast
Disaggregation of Revenue [Line Items]
Total revenues	63,805	54,392
Reportable Segments | Gathering services and related fees | Rockies
Disaggregation of Revenue [Line Items]
Total revenues	65,869	67,838
Reportable Segments | Gathering services and related fees | Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	3,668
Reportable Segments | Gathering services and related fees | Piceance
Disaggregation of Revenue [Line Items]
Total revenues	81,041	80,630
Reportable Segments | Gathering services and related fees | Barnett
Disaggregation of Revenue [Line Items]
Total revenues	37,508	41,830
Reportable Segments | Natural gas, NGLs and condensate sales
Disaggregation of Revenue [Line Items]
Total revenues	179,254	86,204
Reportable Segments | Natural gas, NGLs and condensate sales | Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Reportable Segments | Natural gas, NGLs and condensate sales | Rockies
Disaggregation of Revenue [Line Items]
Total revenues	173,688	59,208
Reportable Segments | Natural gas, NGLs and condensate sales | Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	17,382
Reportable Segments | Natural gas, NGLs and condensate sales | Piceance
Disaggregation of Revenue [Line Items]
Total revenues	4,788	7,111
Reportable Segments | Natural gas, NGLs and condensate sales | Barnett
Disaggregation of Revenue [Line Items]
Total revenues	778	2,503
Reportable Segments | Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	31,463	34,029
Reportable Segments | Other revenues | Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Reportable Segments | Other revenues | Rockies
Disaggregation of Revenue [Line Items]
Total revenues	15,474	16,557
Reportable Segments | Other revenues | Permian
Disaggregation of Revenue [Line Items]
Total revenues	3,570	4,101
Reportable Segments | Other revenues | Piceance
Disaggregation of Revenue [Line Items]
Total revenues	5,588	5,608
Reportable Segments | Other revenues | Barnett
Disaggregation of Revenue [Line Items]
Total revenues	$ 6,831	$ 7,763

XML

PROPERTY, PLANT, AND EQUIPMENT - Schedule of Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,468,607	$ 2,395,344
Less accumulated depreciation	(770,022)	(676,590)
Property, plant and equipment, net	1,698,585	1,718,754
Gathering and processing systems and related equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,335,980	2,262,330
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56,064	59,036
Land and line fill
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,534	11,756
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 65,029	$ 62,222

XML

PROPERTY, PLANT, AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Long-lived asset impairment	$ 540	$ 91,644

XML

PROPERTY, PLANT, AND EQUIPMENT - Schedule of Depreciation Expense and Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 95,307	$ 93,457
Capitalized interest	$ 1,284	$ 838

XML

INTANGIBLE ASSETS - Intangible Assets and Liabilities Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (329,677)	$ (301,282)
Net	167,156
Indefinite-lived intangibles	8,436	8,436
Total intangibles, gross	505,269	500,000
Intangible Assets, Net (Excluding Goodwill), Total	175,592	198,718
Favorable gas gathering contracts
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	21,063	21,063
Accumulated amortization	(15,747)	(14,809)
Net	5,316	6,254
Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	270,412	270,412
Accumulated amortization	(247,024)	(228,143)
Net	23,388	42,269
Rights-of-way
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	205,358	200,089
Accumulated amortization	(66,906)	(58,330)
Net	$ 138,452	$ 141,759

XML

INTANGIBLE ASSETS - Recognized Amortization Expense in Other Revenues and Cost and Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Revenue | Favorable gas gathering contracts
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 938	$ 938
Costs And Expenses | Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Amortization expense	18,881	18,935
Costs And Expenses | Rights-of-way
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 8,576	$ 6,527

XML

INTANGIBLE ASSETS - Estimated Aggregate Annual Amortization Expected to be Recognized (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 18,076
2025	17,892
2026	14,867
2027	8,878
2028	8,711
Thereafter	98,732
Net	$ 167,156

XML

EQUITY METHOD INVESTMENTS - Schedule of Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	$ 486,434	$ 506,677
Double E
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	276,221	281,640
Ohio Gathering
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	$ 210,213	$ 225,037

XML

EQUITY METHOD INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments	$ (3,500)	$ (8,444)
Distributions from equity method investees	$ 57,572	43,040
Double E
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest (as a percent)	70.00%
Payments to acquire equity method investments	$ (3,500)	$ (8,400)
Distributions from equity method investees	28,300
Distribution made to partnership from total distributions	$ 19,800
OGC | Principal Owner
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest (as a percent)		37.20%
OCC | Principal Owner
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest (as a percent)	38.20%	38.20%
Ohio Gathering | Principal Owner
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest (as a percent)	36.50%

XML

EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Nov. 30, 2023	Dec. 31, 2022	Nov. 30, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 98,422		$ 97,542
TOTAL ASSETS	2,494,198		2,559,964
Current liabilities	134,012		117,889
Total liabilities	1,650,983		1,676,562
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Current assets	11,410		5,121
Noncurrent assets	391,777		403,594
TOTAL ASSETS	403,187		408,715
Current liabilities	6,373		8,635
Noncurrent liabilities	13,727		9,137
Total liabilities	$ 20,100		$ 17,772
OGC
Schedule of Equity Method Investments [Line Items]
Current assets		$ 42,716		$ 36,062
Noncurrent assets		1,131,503		1,157,530
TOTAL ASSETS		1,174,219		1,193,592
Current liabilities		6,174		6,942
Noncurrent liabilities		14,088		13,380
Total liabilities		20,262		20,322
OCC
Schedule of Equity Method Investments [Line Items]
Current assets		5,885		5,195
Noncurrent assets		1,104		274
TOTAL ASSETS		6,989		5,469
Current liabilities		3,736		3,588
Noncurrent liabilities		1,149		3,096
Total liabilities		$ 4,885		$ 6,684

XML

EQUITY METHOD INVESTMENTS - Statements of Operations Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Nov. 30, 2023	Dec. 31, 2022	Nov. 30, 2022
Schedule of Equity Method Investments [Line Items]
Net loss	$ (38,947)		$ (123,461)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Total revenues	42,335		32,418
Total operating expenses	26,868		25,685
Net loss	$ 15,467		$ 6,733
Ohio Gathering
Schedule of Equity Method Investments [Line Items]
Total revenues		$ 138,707		$ 113,317
Total operating expenses		99,770		106,369
Net loss		38,937		6,948
OCC
Schedule of Equity Method Investments [Line Items]
Total revenues		15,603		13,340
Total operating expenses		12,285		12,786
Net loss		$ 3,318		$ 554

XML

EQUITY METHOD INVESTMENTS - Rollforward of the Investment in Equity Method Investees (Details) - USD ($) $ in Thousands	11 Months Ended		12 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Equity Method Investment [Roll Forward]
Beginning balance	$ 506,677		$ 506,677
December cash distributions			57,572	$ 43,040
Ending balance			486,434	506,677
Ohio Gathering
Equity Method Investment [Roll Forward]
Beginning balance	225,037		225,037
Ending balance			210,213	225,037
Ohio Gathering | Summit Midstream Partners, LLC
Equity Method Investment [Roll Forward]
Beginning balance	210,213	$ 225,037	$ 210,213	225,037
December cash distributions	3,950	2,673
Basis difference	190,600	199,263
Ending balance	$ 404,763	$ 426,973		$ 210,213

XML

DEFERRED REVENUE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Change in Contract With Customer, Liability, Current [Roll Forward]
Beginning balance	$ 9,054
Additions	10,970
Less: revenue recognized and other	(9,828)
Ending balance	10,196
Change in Contract With Customer, Liability, Noncurrent [Roll Forward]
Beginning balance	37,694
Additions	2,951
Less: reclassification to current deferred revenue and other	(10,560)
Ending balance	$ 30,085

XML

DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Total	$ 1,502,139
Less: unamortized debt discount and debt issuance costs	(31,449)	$ (39,454)
Total debt, net of unamortized debt discount and debt issuance costs	1,470,690	1,490,362
Less: current portion of Permian Transmission Term Loan	(15,524)	(10,507)
Total long-term debt	1,455,166	1,479,855
Asset Backed Lending Facility | Line of Credit
Line of Credit Facility [Line Items]
Secured notes	313,000	330,000
Permian Transmission Term Loan
Line of Credit Facility [Line Items]
Total	144,846
Permian Transmission Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Total	$ 144,846	155,353
2026 Unsecured Notes
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	12.00%
2026 Unsecured Notes | Unsecured Debt
Line of Credit Facility [Line Items]
Unsecured notes	$ 209,510	0
2025 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	5.75%
2025 Senior Notes | Senior Notes
Line of Credit Facility [Line Items]
Unsecured notes	$ 49,783	259,463
2026 Secured Notes
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	8.50%
2026 Secured Notes | Term Loan
Line of Credit Facility [Line Items]
Unsecured notes	$ 785,000	$ 785,000

XML

DEBT - Schedule of Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Disclosure [Abstract]
2024	$ 15,524
2025	66,363
2026	1,324,477
2027	17,769
2028	78,006
Thereafter	0
Total	$ 1,502,139

XML

DEBT - Narrative (Details)		1 Months Ended		12 Months Ended
	Nov. 02, 2021 USD ($)	Nov. 30, 2023 USD ($)	Feb. 28, 2017	Dec. 31, 2023 USD ($) covenant	Dec. 31, 2022 USD ($)	Nov. 16, 2023	Nov. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 08, 2021 USD ($)
Debt Instrument [Line Items]
Number of covenant | covenant				2
Revolving credit facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				3.25%
ABL Facility
Debt Instrument [Line Items]
Borrowing capacity	$ 400,000,000			$ 400,000,000
Borrowing base				$ 723,200,000
Interest rate (as a percent)				8.71%
Unused portion under the facility				$ 82,700,000
Secured notes				$ 4,300,000
Covenant, interest coverage ratio	1.75			1.93
Covenant, interest coverage ratio, thereafter	1.90
Mandatory redemption period (in days)				120 days
Maximum amount of debt outstanding for maturity to occur				$ 50,000,000
Covenant, first lien net leverage ratio	2.50			1.22
ABL Facility | Revolving credit facility
Debt Instrument [Line Items]
Covenant, interest coverage ratio						1.75
Covenant, interest coverage ratio, thereafter						1.90
2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)				5.75%
2025 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Unsecured notes				$ 49,783,000	$ 259,463,000
Credit Agreement
Debt Instrument [Line Items]
Borrowing capacity									$ 175,000,000
Unused borrowing capacity amount				$ 4,500,000
Credit Agreement | Summit Permian Transmission, LLC
Debt Instrument [Line Items]
Percentage of debt hedged by interest rate derivatives				90.00%
Credit Agreement | Standby Letters of Credit
Debt Instrument [Line Items]
Unused borrowing capacity amount				$ 10,500,000
Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.475%
Interest rate (as a percent)				7.79%
Commitment fee (as a percent)				0.70%
Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Interest Rate Contract | Summit Permian Transmission, LLC
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.23%
Credit Agreement | Term Loan Credit Facility
Debt Instrument [Line Items]
Borrowing capacity									160,000,000
Credit Agreement | Working Capital Credit Facility
Debt Instrument [Line Items]
Borrowing capacity									$ 15,000,000
Permian Transmission Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.475%
2026 Notes
Debt Instrument [Line Items]
Debt instrument, amount							$ 85,000,000	$ 700,000,000
Stated interest rate (as a percent)								8.50%
Debt instrument issued as a percentage of face value (as a percent)							99.26%	98.50%
2025 Senior Notes
Debt Instrument [Line Items]
Mandatory redemption period (in days)	91 days
Maximum amount of debt outstanding for maturity to occur	$ 50,000,000
Debt instrument, amount		$ 180,000,000
Cash to certain purchasers		29,500,000
Debt instrument, repurchased face amount		29,700,000
2025 Senior Notes | Redemption period three | Summit Holdings and Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)			100.00%
Secured Notes Indenture, 2026
Debt Instrument [Line Items]
Interest rate (as a percent)					9.50%
Redemption price, percentage of principal amount redeemed (as a percent)	35.00%
Redemption price, expressed as percentage of principal amount (as a percent)	108.50%
Covenant redemption, percent of initial principal amount remaining outstanding	65.00%
Ownership percentage of principal (as a percent)	25.00%
Repurchase amount of principal plus accrued interest (as a percent)	100.00%
Excess cash flow offer to purchase, period one	$ 50,000,000
Excess ash flow offer to purchase, basis point increase, period one	0.50%				0.50%
Excess cash flow offer to purchase, period two	$ 100,000,000
Excess cash flow offer to purchase, basis point increase, period two	1.00%
Excess cash flow offer to purchase, period three	$ 200,000,000
Excess cash flow offer to purchase, basis point increase, period three	2.00%
Interest expense					$ 3,900,000
Secured Notes Indenture, 2026 | Redemption period one
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)	104.25%
Secured Notes Indenture, 2026 | Redemption period two
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)	102.125%
Secured Notes Indenture, 2026 | Redemption period three
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)	100.00%
2026 Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, amount		$ 209,500,000
2026 Unsecured Notes | Redemption period one | Summit Holdings and Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)		101.00%
2026 Unsecured Notes | Redemption period two | Summit Holdings and Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount (as a percent)		102.00%
2026 Unsecured Notes Indenture
Debt Instrument [Line Items]
Debt default, compliance period (in days)		30 days
Payment default		$ 75,000,000
Restricted subsidiaries to pay final judgments		$ 75,000,000
Restricted subsidiaries, discharge period (in days)		60 days
Threshold percentage of principal amount outstanding (as a percent)		25.00%

XML

DEBT - Schedule of Maturities of Long-Term Debt (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Total	$ 1,502,139
2024	15,524
2025	66,363
2026	1,324,477
2027	17,769
2028	78,006
Permian Transmission Term Loan
Debt Instrument [Line Items]
Total	144,846
2024	15,524
2025	16,580
2026	16,967
2027	17,769
2028	$ 78,006

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COMMITMENTS AND CONTINGENCIES - Rollforward of Environmental Matters (Details) - Meadowlark Midstream Gathering System - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]
Accrued environmental remediation, beginning balance	$ 3,705	$ 5,606
Payments made	(641)	(2,746)
Additional accruals		845
Changes in estimates	(127)
Accrued environmental remediation, ending balance	$ 2,937	$ 3,705

XML

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) claim	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Legal fines and other fees	$ 36,300
Claims settled | claim	1
2015 Blacktail Release
Loss Contingencies [Line Items]
Loss contingency accrual	$ 21,700	$ 28,300
Penalties and fines, payment period	3 years
Unpaid penalties and fines, fixed rate (as a percent)	3.25%
Expected payment	$ 6,700
Claims settled | claim	1
Pending claims | claim	2
2015 Blacktail Release | Natural Resource Damages To Federal and State Governments
Loss Contingencies [Line Items]
Legal fines and other fees	$ 1,250
Penalties and fines, payment period	5 years
2015 Blacktail Release | Damages Payable To Federal Government over Five Years
Loss Contingencies [Line Items]
Legal fines and other fees	$ 25,000
2015 Blacktail Release | Damages Payable To State Governments Over Six Years
Loss Contingencies [Line Items]
Legal fines and other fees	$ 10,000
Penalties and fines, payment period	6 years
2015 Blacktail Release | Damages Payable To Federal Criminal Over Five Years
Loss Contingencies [Line Items]
Penalties and fines, payment period	5 years

XML

FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Interest Rate Swap
CONCENTRATIONS OF RISK
Derivative instrument, notional amount	$ 130,400,000	$ 139,800,000
Fair value of interest rate swap	11,900,000	15,200,000
Fair Value, Inputs, Level 3
CONCENTRATIONS OF RISK
Deferred earn-out liability	$ 5,100,000	$ 5,200,000

XML

FINANCIAL INSTRUMENTS - Fair value of Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Carrying Value | 2025 Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 49,783	$ 259,463
Carrying Value | 2026 Secured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	785,000	785,000
Carrying Value | 2026 Unsecured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	209,510	0
Fair Value | 2025 Senior Notes | Estimated fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	48,414	221,733
Fair Value | 2026 Secured Notes | Estimated fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	778,131	750,983
Fair Value | 2026 Unsecured Notes | Estimated fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 203,225	$ 0

XML

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Partners' Capital and Schedule of Units (Details) - shares	1 Months Ended	12 Months Ended
	Jan. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Common Units
Rollforwards of the number of partner units
Beginning balance (in shares)	7,169,834	10,182,763	7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes (in shares)	2,853,875		2,853,875
Common units issued for SMLP LTIP, net (in shares)		193,426	159,054
Ending balance (in shares)		10,376,189	10,182,763
Series A Preferred Units
Rollforwards of the number of partner units
Beginning balance (in shares)	143,447	65,508	143,447
2022 Preferred Exchange Offer (in shares)		0	(77,939)
Ending balance (in shares)		65,508	65,508

XML

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 15, 2023	Dec. 15, 2022	Jan. 21, 2020	Jan. 31, 2022	Nov. 30, 2017	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Partners Capital [Line Items]
Add: deemed capital contribution				$ 92.6
Maximum period following end of quarter to distribute all available cash							45 days
Subsidiary Series A Preferred Units
Partners Capital [Line Items]
Preferred units issued (in shares)						93,039,000	93,039,000
Preferred units issued during period (in shares)							1,600,000
Subsidiary Series A preferred unitholders, outstanding (in shares)						93,039,000	93,039,000
Common Units
Partners Capital [Line Items]
General partner units converted (in shares)				2,853,875				2,853,875
Series A Preferred Units
Partners Capital [Line Items]
Preferred units issued (in shares)				77,939	300,000
Interest in partnership per unit (in dollars per share)					$ 1,000
Distribution rate (as a percent)					9.50%		7.00%
Liquidation preference per unit (in dollars per share)					$ 1,000	$ 1,000	$ 1,000
Dividends payable						$ 33.0	$ 33.0
Redemption amount						$ 125.5	$ 125.5
Series A Preferred Units | Paid-in-kind
Partners Capital [Line Items]
Distribution percentage of subsidiary unit (as a percent)			7.00%
Distribution percentage of liquidation preference rate of undrawn commitment units (as a percent)			1.00%
Series A Preferred Units | London Interbank Offer Rate (LIBOR)
Partners Capital [Line Items]
Basis spread on variable rate (as a percent)	13.10%	7.43%
Series A Preferred Units | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Partners Capital [Line Items]
Basis spread on variable rate (as a percent)						7.69%

XML

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Change in Subsidiary Series A Preferred Unit Balance (Details) - Series A Preferred Units - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Partners Capital [Line Items]
Issuance costs	$ 1,700	$ 2,200
Rollforwards of the number of partner units
Beginning Balance	118,584	106,325
PIK distributions		1,600
Redemption accretion, net of issuance cost amortization	12,581	15,544
Cash distribution	(6,513)	(4,885)
Ending Balance	124,652	$ 118,584
Distribution payable	$ 1,600

XML

EARNINGS PER UNIT (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (38,947)	$ (123,461)
Net loss attributable to Summit Midstream Partners, LP	(51,528)	(140,605)
Parent Company
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Add: deemed capital contribution	$ 0	$ 20,974
Phantom Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU (in shares)	245	177
Series A Preferred Units | Subsidiaries
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Less: Net income attributable to Subsidiary Series A Preferred Units	$ (12,581)	$ (17,144)
Series A Preferred Units | Parent Company
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Less: Net income attributable to Subsidiary Series A Preferred Units	(11,566)	(8,048)
Common units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to limited partners	$ (63,094)	$ (127,679)
Weighted-average common units outstanding – basic (in shares)	10,334	10,048
Effect of nonvested phantom units (in shares)	0	0
Weighted-average common units outstanding – diluted (in shares)	10,334	10,048
Common unit - basic (in dollars per share)	$ (6.11)	$ (12.71)
Common unit - diluted (in dollars per share)	$ (6.11)	$ (12.71)

XML

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Supplemental cash flow information:
Cash interest paid	$ 127,022	$ 89,472
Cash paid for taxes	15	149
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	11,612	6,724
Right-of-use assets acquired in connection with Sterling DJ acquisition	0	9,865
2022 Preferred Exchange Offer	0	92,587
2025 Senior Notes
Noncash investing and financing activities:
2025 Senior Notes Exchange	180,030	0
Series A Preferred Units
Noncash investing and financing activities:
Accretion of Subsidiary Series A Preferred Units	$ 12,581	$ 15,544

XML

UNIT-BASED AND NONCASH COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) director $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining vesting period (in years)	11 months 23 days
SMLP LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for issuance (in shares)	1,000,000
Units remaining available (in shares)	500,000
Unrecognized unit-based compensation | $	$ 5.9
SMLP LTIP | Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested phantom units granted (in shares)	688,467	605,142	333,779
Units granted (in shares)	323,371	509,631
Granted (in dollars per unit) | $ / shares	$ 17.29	$ 17.70
SMLP LTIP | Phantom Share Units And Associated Distribution Equivalent Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	212,893
Vesting period (in years)	3 years
SMLP LTIP | Phantom Share Units And Associated Distribution Equivalent Rights | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per unit) | $ / shares	$ 16.00
SMLP LTIP | Phantom Share Units And Associated Distribution Equivalent Rights | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
SMLP LTIP | Common units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common units issued (in shares)	38,100
Number of directors | director	6
Grant date fair value (in dollars per share) | $ / shares	$ 16.00
SMLP LTIP | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	110,478
Grant date fair value | $	$ 2.2

XML

UNIT-BASED AND NONCASH COMPENSATION - SMLP Long-Term Incentive Plan (Details) - SMLP LTIP - Phantom Units - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Units
Beginning balance (in shares)	605,142	333,779
Granted (in shares)	323,371	509,631
Vested (in shares)	(236,154)	(229,551)
Forfeited (in shares)	(3,892)	(8,717)
Ending balance (in shares)	688,467	605,142
Weighted-average grant date fair value
Beginning balance (in dollars per unit)	$ 17.62	$ 21.78
Granted (in dollars per unit)	17.29	17.70
Vested (in dollars per unit)	15.69	23.61
Forfeited (in dollars per unit)	20.50	22.53
Ending balance (in dollars per unit)	$ 17.69	$ 17.62

XML

UNIT-BASED AND NONCASH COMPENSATION - Schedule of Intrinsic Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SMLP LTIP | Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of vested LTIP awards	$ 3,758	$ 5,420

XML

UNIT-BASED AND NONCASH COMPENSATION - SMP Net Profits Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SMLP LTIP unit-based compensation	$ 6,566	$ 3,778
SMLP LTIP | General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SMLP LTIP unit-based compensation		$ 3,778

XML

LEASES - Narrative (Details)	12 Months Ended
	Dec. 31, 2023
Loss Contingencies [Line Items]
Finance leases, term of contract (in years)	3 years
Revolving credit facility
Loss Contingencies [Line Items]
Percentage of operating lease incremental borrowing rate (as a percent)	6.43%
Minimum | Office Space
Loss Contingencies [Line Items]
Operating leases, term of contract (in years)	3 years
Minimum | Equipment
Loss Contingencies [Line Items]
Operating leases, term of contract (in years)	3 years
Maximum | Office Space
Loss Contingencies [Line Items]
Operating leases, term of contract (in years)	10 years
Maximum | Equipment
Loss Contingencies [Line Items]
Operating leases, term of contract (in years)	4 years

XML

LEASES - Schedule of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ROU assets
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets	Other noncurrent assets
Operating	$ 10,352	$ 11,633
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets	Other noncurrent assets
Finance	$ 2,400	$ 1,389
Total	$ 12,752	$ 13,022
Lease liabilities, current
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Operating	$ 3,341	$ 2,570
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Finance	$ 870	$ 435
Total	$ 4,211	$ 3,005
Lease liabilities, noncurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities	Other noncurrent liabilities
Operating	$ 7,360	$ 9,672
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities	Other noncurrent liabilities
Finance	$ 1,197	$ 679
Total	$ 8,557	$ 10,351

XML

LEASES - Schedule of Lease Cost and Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lease cost
Amortization of ROU assets (included in depreciation and amortization)	$ 686	$ 673
Interest on lease liabilities (included in interest expense)	62	18
Operating lease cost (included in general and administrative expense)	1,999	1,815
Total lease cost	2,747	2,506
Other information
Operating cash outflows from operating leases	3,975	1,732
Operating cash outflows from finance leases	62	18
Financing cash outflows from finance leases	610	330
ROU assets obtained in exchange for new operating lease liabilities	3,516	9,865
ROU assets obtained in exchange for new finance lease liabilities	$ 1,238	$ 1,298
Weighted-average remaining lease term (years) - operating leases	3 years 7 months 6 days	4 years 8 months 12 days
Weighted-average remaining lease term (years) - finance leases	2 years 6 months	2 years 4 months 24 days
Weighted-average discount rate - operating leases (as a percent)	6.00%	6.00%
Weighted-average discount rate - finance leases (as a percent)	5.00%	3.00%

XML

LEASES - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Lease expense	$ 5,898	$ 3,162

XML

LEASES - Future Minimum Lease Payments Due and Future Minimum Rentals to be Received under Noncancelable Leases (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Operating
2024	$ 4,067
2025	3,573
2026	2,468
2027	2,074
2028	61
2029	27
Thereafter	330
Total future minimum lease payments	12,600
Finance
2024	870
2025	736
2026	374
2027	87
2028	0
2029	0
Thereafter	0
Total future minimum lease payments	$ 2,067

XML

SEGMENT INFORMATION - Assets, Revenues, Depreciation and Amortization, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 2,494,198	$ 2,559,964
Total revenues	458,903	369,594
Depreciation and amortization	123,702	119,993
Total cash paid for capital expenditures	68,905	30,472
Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,483,258	2,547,818
Total revenues	458,940	368,591
Depreciation and amortization	122,189	118,237
Total cash paid for capital expenditures	64,394	28,535
Reportable Segments | Northeast
Segment Reporting Information [Line Items]
Total assets	573,663	591,091
Total revenues	63,805	54,392
Depreciation and amortization	17,856	17,501
Total cash paid for capital expenditures	4,695	8,743
Reportable Segments | Rockies
Segment Reporting Information [Line Items]
Total assets	904,974	886,629
Total revenues	255,031	143,603
Depreciation and amortization	36,148	30,532
Total cash paid for capital expenditures	54,969	11,903
Reportable Segments | Permian
Segment Reporting Information [Line Items]
Total assets	291,073	298,906
Total revenues	3,570	25,151
Depreciation and amortization	0	2,736
Total cash paid for capital expenditures	0	1,407
Reportable Segments | Piceance
Segment Reporting Information [Line Items]
Total assets	431,687	475,719
Total revenues	91,417	93,349
Depreciation and amortization	52,014	51,352
Total cash paid for capital expenditures	4,544	6,116
Reportable Segments | Barnett
Segment Reporting Information [Line Items]
Total assets	281,861	295,473
Total revenues	45,117	52,096
Depreciation and amortization	16,171	16,116
Total cash paid for capital expenditures	186	366
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	10,940	12,146
Total revenues	(37)	1,003
Depreciation and amortization	1,513	1,756
Total cash paid for capital expenditures	$ 4,511	$ 1,937

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SEGMENT INFORMATION - Concentration Risk (Details) - Sales Revenue, Net - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Piceance
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	10.00%	13.00%
Rockies
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	13.00%

XML

SEGMENT INFORMATION - Adjusted EBITDA by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	$ 291,766	$ 244,586
Northeast
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	94,249	77,046
Rockies
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	87,390	57,810
Permian
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	24,207	18,051
Piceance
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	59,749	60,055
Barnett
Segment Reporting Information [Line Items]
Total of reportable segments' measures of profit	$ 26,171	$ 31,624

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SEGMENT INFORMATION - Reconciliation of Net Loss to Adjusted EBITDA (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Loss before income taxes and equity method investment income	$ (72,454)	$ (141,277)
Add:
Corporate and Other expense	30,758	29,118
Interest expense	140,784	102,459
Loss on early extinguishment of debt	10,934	0
Depreciation and amortization	123,702	119,993
Proportional adjusted EBITDA for equity method investees	61,070	45,419
Adjustments related to capital reimbursement activity	(9,874)	(6,041)
Unit-based and noncash compensation	6,566	3,778
Gain on asset sales, net	(260)	(507)
Long-lived asset impairment	540	91,644
Total of reportable segments' measures of profit	$ 291,766	$ 244,586