0001549922-24-000046 | 10-Q | XBRL Viewer | Summit Midstream Partners LP

PARTNERS' CAPITAL AND MEZZANINE CAPITAL (Tables)

3 Months Ended

Mar. 31, 2024

An update on the number of common units is as follows for the period from December 31, 2023 to March 31, 2024.


			Common Units
Units, December 31, 2023			10,376,189

Common units issued for SMLP LTIP, net			272,496
Units, March 31, 2024			10,648,685

Schedule of Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net

The following table shows the change in the Partnership’s Subsidiary Series A Preferred Unit balance from January 1, 2024 to March 31, 2024, net of $1.6 million and $1.7 million of unamortized issuance costs at March 31, 2024 and December 31, 2023, respectively:


	(In thousands)
Balance at December 31, 2023	$	124,652
Redemption accretion, net of issuance cost amortization	3,770
Cash distribution (includes a $1.6 million distribution payable as of March 31, 2024)	(1,628)
Balance at March 31, 2024	$	126,794

DEBT

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

DEBT

8. DEBT

Debt for the Partnership at March 31, 2024 and December 31, 2023, follows:


	March 31, 2024		December 31, 2023
	(In thousands)
ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026	$	—	$	313,000

Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028	141,052		144,846
2026 Unsecured Notes: 12.00% senior unsecured notes due October 15, 2026	209,510		209,510
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025	49,783		49,783
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	(28,960)		(31,449)
Total debt, net of unamortized debt discount and debt issuance costs	1,156,385		1,470,690
Less: current portion of Permian Transmission Term Loan and 2026 Secured Notes tender	(29,098)		(15,524)
Total long-term debt	$	1,127,287	$	1,455,166

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 March 31, 2024, the most recent borrowing base determination of eligible assets totaled $683.6 million, an amount greater than the $400.0 million of aggregate lending commitments.

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 March 31, 2024, the outstanding balance of the 2025 Senior Notes was $49.8 million.

As of March 31, 2024, the applicable margin under the adjusted SOFR borrowings was 3.25%, the interest rate was 8.69% and the available borrowing capacity of the ABL Facility totaled $383.7 million after giving effect to the issuance of $4.3 million in outstanding but undrawn irrevocable standby letters of credit and $12.0 million of commitment reserves.

In connection with the closing of the Utica Sale, the ABL Facility was amended to, among other things, (i) permit the Utica Sale, (ii) amend the change of control provision to permit certain structural changes in connection with a conversion to a C-corporation and (iii) amend the Interest Coverage Ratio (as defined in the ABL Agreement) covenant such that the Interest Coverage Ratio as of the last day of any fiscal quarter must be less than (a) for any fiscal quarter ending on or before December 31, 2024, (x) if no loans under the Credit Agreement are outstanding and unrestricted cash exceeds $200.0 million, 1.50:1.00 and (y) if any loans under the Credit Agreement are outstanding or unrestricted cash is less than such threshold, 1.75:1.00 and (b) thereafter, 1.90:1.00.

The ABL Facility also requires that Summit Holdings not permit 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. As of March 31, 2024, the First Lien Net Leverage Ratio was -0.26:1.00 and the Interest Coverage Ratio was 1.87:1.00. As of March 31, 2024, the Partnership was in compliance with the financial covenants of the ABL Facility.

A portion of the proceeds from the Utica Sale were used to repay all amounts outstanding under the ABL Facility. As of March 31, 2024, there were no amounts outstanding under the ABL Facility.

Permian Transmission Credit Facilities. On March 8, 2021, the Partnership’s unrestricted subsidiary, Summit Permian Transmission, entered into a Credit Agreement which allows for $175.0 million of senior secured credit facilities (the “Permian Transmission 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 Summit 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.

As of March 31, 2024, the applicable margin under adjusted term SOFR borrowings was 2.475%, the average 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 March 31, 2024, the Partnership was in compliance with the financial covenants of the Permian Transmission Credit Facilities.

Permian Transmission Term Loan. In accordance with the terms of the Permian Transmission Credit Facilities, 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 March 31, 2024, the applicable margin under adjusted term SOFR borrowings was 2.475% and the average interest rate was 7.79%. As of March 31, 2024, 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, Summit Permian Transmission is required to make mandatory principal repayments. Below is a summary of the remaining mandatory principal repayments as of March 31, 2024:


(In thousands)	Total		2024		2025		2026		2027		2028
Amortizing principal repayments	$	141,052	$	11,730	$	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 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 are effectively subordinated to any of our or the guarantors’ current and future secured first lien indebtedness, including indebtedness incurred under the ABL Facility, to the extent of the value of the collateral securing such

indebtedness, and our and the guarantors’ current and future debt that is secured by liens on assets other than the collateral, to the extent of the value of such assets. The 2026 Secured Notes are structurally subordinated to all indebtedness and other liabilities of our subsidiaries that do not guarantee the 2026 Secured Notes. The 2026 Secured Notes are effectively equal to our and the guarantors’ obligations under any future second lien indebtedness and effectively senior to all of our future junior lien indebtedness and existing and future unsecured indebtedness, including our outstanding senior unsecured notes, to the extent of the value of the collateral, and senior to any of our future subordinated indebtedness. The 2026 Secured Notes will mature on October 15, 2026.

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. As of March 31, 2024, the Partnership was in compliance with the financial covenants governing its 2026 Secured Notes.

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. 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).

Based on the amount of our Excess Cash Flow for the fiscal year ended 2023, on March 27, 2024, the Partnership commenced a cash tender offer to purchase up to $19.3 million aggregate principal amount of the outstanding 2026 Secured Notes at 100% of the principal amount plus accrued and unpaid interest. The cash flow offer expired on April 24, 2024 with $13.6 million tendered and validly accepted. Accordingly, $13.6 million of the 2026 Secured Notes is reflected as current debt in the March 31, 2024 unaudited condensed consolidated balance sheet.

As of April 1, 2024, the Partnership had not made offers to purchase in the required amount of $100.0 million and the interest rate on the 2026 Secured Notes increased an incremental 50 basis points to 9.50% effective on such date.

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 March 31, 2024, the Partnership was in compliance with the financial covenants of the 2026 Unsecured Notes. The 2026 Unsecured Notes will mature on October 15, 2026.

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 March 31, 2024, the Partnership was in compliance with the financial covenants of the 2025 Senior Notes. The 2025 Senior Notes will mature on April 15, 2025.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
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-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//470/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Section 50
-Paragraph 1B
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1C
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

REVENUE - Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 118,871	$ 112,499
Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	74	(37)
Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	118,797	112,536
Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	16,853	12,755
Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	68,594	65,251
Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	910	893
Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	22,580	22,186
Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	9,860	11,451
Gathering services and related fees
Disaggregation of Revenue [Line Items]
Total revenues	61,985	57,371
Gathering services and related fees \| Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Gathering services and related fees \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	61,985	57,371
Gathering services and related fees \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	16,853	12,755
Gathering services and related fees \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	16,516	15,303
Gathering services and related fees \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Gathering services and related fees \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	20,387	19,119
Gathering services and related fees \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	8,229	10,194
Natural gas, NGLs and condensate sales
Disaggregation of Revenue [Line Items]
Total revenues	49,092	49,163
Natural gas, NGLs and condensate sales \| Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Natural gas, NGLs and condensate sales \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	49,092	49,163
Natural gas, NGLs and condensate sales \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Natural gas, NGLs and condensate sales \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	47,970	47,329
Natural gas, NGLs and condensate sales \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Natural gas, NGLs and condensate sales \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	948	1,641
Natural gas, NGLs and condensate sales \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	174	193
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	7,794	5,965
Other revenues \| Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues	74	(37)
Other revenues \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	7,720	6,002
Other revenues \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Other revenues \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	4,108	2,619
Other revenues \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	910	893
Other revenues \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	1,245	1,426
Other revenues \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,457	$ 1,064

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

14. 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 March 31, 2024, 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 March 31, 2025. 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 detailed below.


	(In thousands)
Accrued environmental remediation, December 31, 2023	$	2,937
Payments made	(226)
Changes in estimates	421
Accrued environmental remediation, March 31, 2024	$	3,132

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 March 31, 2024 and December 31, 2023, the accrued loss liability for the 2015 Blacktail Release was $21.7 million and are recorded within Other noncurrent liabilities and Accrued settlement payable within the unaudited condensed 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 5 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 do not materially affect our 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 the Partnership has 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.

FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

A summary of the estimated fair value of our debt financial instruments follows.


	March 31, 2024				December 31, 2023
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(In thousands)

2025 Senior Notes	$	49,783	$	49,016	$	49,783	$	48,414
2026 Secured Notes	$	785,000	$	794,485	$	785,000	$	778,131
2026 Unsecured Notes	$	209,510	$	211,605	$	209,510	$	203,225

________

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

DEFERRED REVENUE (Details) $ in Thousands	3 Months Ended
DEFERRED REVENUE (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Change in Contract with Customer, Liability, Current [Roll Forward]
Current deferred revenue, beginning balance	$ 10,196
Add: additions	1,696
Less: revenue recognized and other	(2,993)
Current deferred revenue, ending balance	8,899
Change in Contract with Customer, Liability, Noncurrent [Roll Forward]
Noncurrent deferred revenue, beginning balance	30,085
Add: additions	563
Less: reclassification to current deferred revenue and other	(1,887)
Noncurrent deferred revenue, ending balance	$ 28,761

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Mar. 31, 2024	Dec. 31, 2023
Partners' Capital
Common limited partner capital, issued (in shares)	10,648,685	10,376,189
Common limited partner capital, outstanding (in shares)	10,648,685	10,376,189
Subsidiary Series A Preferred Units
Series A Preferred Units Issued (in shares)	93,039,000	93,039,000
Series A Preferred Units Outstanding (in shares)	93,039,000	93,039,000
Series A Preferred Units
Subsidiary Series A preferred unitholders, issued (in shares)	65,508	65,508
Partners' Capital
Preferred units, outstanding (in shares)	65,508	65,508

PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Details on the Partnership’s property, plant and equipment follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Gathering and processing systems and related equipment	$	2,124,517	$	2,335,980
Construction in progress	41,888		56,064
Land and line fill	11,546		11,534
Other	64,319		65,029
Total	2,242,270		2,468,607
Less: accumulated depreciation	(794,827)		(770,022)
Property, plant and equipment, net	$	1,447,443	$	1,698,585

Schedule Of Depreciation Expense And Capitalized Interest Costs

Depreciation expense and capitalized interest for the Partnership follow.


	Three Months Ended March 31,
	2024		2023
	(In thousands)
Depreciation expense	$	23,571	$	22,918
Capitalized interest	472		193

EQUITY METHOD INVESTMENTS

3 Months Ended

Mar. 31, 2024

Equity Method Investments and Joint Ventures [Abstract]

EQUITY METHOD INVESTMENTS

6. EQUITY METHOD INVESTMENTS

As of March 31, 2024, the Partnership has an equity method investment in Double E, the balance of which is included in the Investment in equity method investees caption on the unaudited condensed consolidated balance sheets. On March 22, 2024, in connection with the Utica Sale, the Partnership sold its investment in Ohio Gathering and recognized an estimated $126.3 million gain, which is recorded within Gain on sale of equity method investment within the unaudited condensed consolidated statements of operations. See Note 3 - Divestitures for additional information.

Details of the Partnership’s equity method investments follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Double E	$	273,476	$	276,221
Ohio Gathering	—		210,213
Total	$	273,476	$	486,434

SUBSEQUENT EVENTS	3 Months Ended
SUBSEQUENT EVENTS	Mar. 31, 2024
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	16. SUBSEQUENT EVENTS Mountaineer Midstream. On May 1, 2024, the Partnership completed the sale of its Mountaineer Midstream system, to Antero Midstream LLC for a cash sale price of $70 million, subject to customary post-closing adjustments (the “Mountaineer Transaction”). Mountaineer Midstream is the owner of midstream assets located in the Marcellus Shale. Prior to closing the Mountaineer Transaction, the Partnership sold related compression assets located in the Marcellus Shale to a compression service provider for approximately $5 million in April 2024. During the three months ended March 31, 2024, the Partnership recognized an impairment of $68 million, in connection with the Mountaineer Transaction and the sale of compression assets, based on total cash proceeds of approximately $75 million and net assets of approximately $143 million. Cash Tender. As discussed in Note 8 - Debt, on March 27, 2024, the Partnership commenced a cash tender offer to purchase up to $19.3 million aggregate principal amount of the outstanding 2026 Secured Notes at 100% of the principal amount plus accrued and unpaid interest. The cash flow offer expired on April 24, 2024 with $13.6 million tendered and validly accepted. Accordingly, $13.6 million of the 2026 Secured Notes is reflected as current debt in the March 31, 2024 unaudited condensed consolidated balance sheet.

EARNINGS PER UNIT (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table details the components of EPU.


	Three Months Ended March 31,
		2024		2023
		(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net income (loss)		$	132,927	$	(14,163)
Less: Net income attributable to Subsidiary Series A Preferred Units		(3,770)		(1,746)
Net income (loss) attributable to Summit Midstream Partners, LP		$	129,157	(15,909)

Less: Net income attributable to Series A Preferred Units		$	(3,220)	(2,639)


Net income (loss) attributable to common limited partners		$	125,937	$	(18,548)

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic		10,449		10,213
Effect of nonvested phantom units		531		—
Weighted-average common units outstanding – diluted		10,980		10,213

Net income (loss) per limited partner unit:
Common unit – basic		$	12.05	$	(1.82)
Common unit – diluted		$	11.47	$	(1.82)

Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU		38		285

SEGMENT INFORMATION - Adjusted EBITDA by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 79,493	$ 67,067
Rockies
Segment Reporting Information [Line Items]
Adjusted EBITDA	22,874	23,130
Permian
Segment Reporting Information [Line Items]
Adjusted EBITDA	7,265	5,073
Northeast
Segment Reporting Information [Line Items]
Adjusted EBITDA	29,021	17,854
Piceance
Segment Reporting Information [Line Items]
Adjusted EBITDA	15,233	13,983
Barnett
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 5,100	$ 7,027

REVENUE

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

REVENUE

4. REVENUE

The following table presents estimated revenue expected to be recognized during the remainder of 2024 and over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated MVC shortfall payments.


(In thousands)	2024		2025		2026		2027		2028		Thereafter

Gathering services and related fees	$	48,833	$	45,594	$	29,292	$	7,685	$	5,137	$	—

Revenue by category. In the following tables, revenue is disaggregated by geographic area and major products and services. For more detailed information about reportable segments, see Note 15 – Segment Information.


	Three Months Ended March 31, 2024
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	16,853	$	—	$	—	$	16,853
Rockies	16,516		47,970		4,108		68,594
Permian	—		—		910		910
Piceance	20,387		948		1,245		22,580
Barnett	8,229		174		1,457		9,860
Total reportable segments	61,985		49,092		7,720		118,797
Corporate and other	—		—		74		74
Total	$	61,985	$	49,092	$	7,794	$	118,871


	Three Months Ended March 31, 2023
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	12,755	$	—	$	—	$	12,755
Rockies	15,303		47,329		2,619		65,251
Permian	—		—		893		893
Piceance	19,119		1,641		1,426		22,186
Barnett	10,194		193		1,064		11,451
Total reportable segments	57,371		49,163		6,002		112,536
Corporate and other	—		—		(37)		(37)
Total	$	57,371	$	49,163	$	5,965	$	112,499

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 15
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 12
-Subparagraph (a)
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 12
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION	3 Months Ended
	Mar. 31, 2024
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. 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. As of March 31, 2024, other than the Partnership’s investment in Double E, all of its business activities are conducted through wholly owned operating subsidiaries. Presentation and Consolidation. The Partnership prepares its condensed consolidated financial statements in accordance with GAAP as established by the FASB and pursuant to the rules and regulations of the SEC pertaining to interim financial information. The unaudited condensed consolidated financial statements contained in this report include all normal and recurring material adjustments that, in the opinion of management, are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented herein. These unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and related notes that are included in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2023. 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 unaudited condensed 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.

COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Schedule of Accrued Environmental Remediation


	(In thousands)
Accrued environmental remediation, December 31, 2023	$	2,937
Payments made	(226)
Changes in estimates	421
Accrued environmental remediation, March 31, 2024	$	3,132

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 344,590	$ 14,044
Restricted cash	3,454	2,601
Accounts receivable	66,587	76,275
Other current assets	5,935	5,502
Total current assets	420,566	98,422
Property, plant and equipment, net	1,447,443	1,698,585
Intangible assets, net	147,304	175,592
Investment in equity method investees	273,476	486,434
Other noncurrent assets	31,786	35,165
TOTAL ASSETS	2,320,575	2,494,198
LIABILITIES AND CAPITAL
Trade accounts payable	18,063	22,714
Accrued expenses	36,554	32,377
Deferred revenue	8,899	10,196
Ad valorem taxes payable	3,282	8,543
Accrued compensation and employee benefits	2,824	6,815
Accrued interest	44,826	19,298
Accrued environmental remediation	1,854	1,483
Accrued settlement payable	6,667	6,667
Current portion of long-term debt	29,098	15,524
Other current liabilities	7,476	10,395
Total current liabilities	159,543	134,012
Long-term debt, net of issuance costs	1,127,287	1,455,166
Noncurrent deferred revenue	28,761	30,085
Noncurrent accrued environmental remediation	1,278	1,454
Other noncurrent liabilities	28,298	30,266
TOTAL LIABILITIES	1,345,167	1,650,983
Commitments and contingencies (Note 14)
Mezzanine Capital
Subsidiary Series A Preferred Units (93,039 units issued and outstanding at March 31, 2024 and December 31, 2023)	126,794	124,652
Partners' Capital
Series A Preferred Units (65,508 units issued and outstanding at March 31, 2024 and December 31, 2023)	100,113	96,893
Common limited partner capital (10,648,685 and 10,376,189 units issued and outstanding at March 31, 2024 and December 31, 2023, respectively)	748,501	621,670
Total partners' capital	848,614	718,563
TOTAL LIABILITIES AND CAPITAL	$ 2,320,575	$ 2,494,198

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues:
Total revenues	$ 118,871	$ 112,499
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	$ 30,182	$ 30,882
Operation and maintenance	25,012	23,972
General and administrative	14,785	9,987
Depreciation and amortization	27,867	29,824
Transaction costs	7,791	302
Acquisition integration costs	40	1,502
Gain on asset sales, net	(27)	(68)
Long-lived asset impairments	67,916	0
Total costs and expenses	173,566	96,401
Other income (expense), net	(13)	56
Gain (loss) on interest rate swaps	2,590	(1,273)
Gain on sale of business	86,202	18
Gain on sale of equity method investment	126,261	0
Interest expense	(37,846)	(34,223)
Income (loss) before income taxes and equity method investment income	122,499	(19,324)
Income tax benefit (expense)	(210)	252
Income from equity method investees	10,638	4,909
Net income (loss)	132,927	(14,163)
Less: Net income attributable to Subsidiary Series A Preferred Units	(3,770)	(1,746)
Net income (loss) attributable to Summit Midstream Partners, LP	129,157	(15,909)
Less: net income attributable to Series A Preferred Units	(3,220)	(2,639)
Net income (loss) attributable to common limited partners	$ 125,937	$ (18,548)
Net income (loss) per limited partner unit:
Common unit - basic (in dollars per share)	$ 12.05	$ (1.82)
Common unit - diluted (in dollars per share)	$ 11.47	$ (1.82)
Weighted-average limited partner units outstanding:
Common units - basic (in shares)	10,449	10,213
Common units - diluted (in shares)	10,980	10,213
Gathering services and related fees
Revenues:
Total revenues	$ 61,985	$ 57,371
Natural gas, NGLs and condensate sales
Revenues:
Total revenues	49,092	49,163
Other revenues
Revenues:
Total revenues	$ 7,794	$ 5,965

UNIT-BASED AND NONCASH COMPENSATION (Details) - SMLP LTIP $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) director shares
Phantom Share Units And Associated Distribution Equivalent Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units (in shares)	230,815
Vesting period	3 years
Grant date fair value \| $	$ 3.7
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units (in shares)	122,867
Vesting period	3 years
Grant date fair value \| $	$ 2.4
Common Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value \| $	$ 0.6
Issued units (in shares)	39,486
Number of directors \| director	6
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units remaining available (in shares)	100,000
Unvested phantom units granted (in shares)	700,000

UNIT-BASED AND NONCASH COMPENSATION	3 Months Ended
UNIT-BASED AND NONCASH COMPENSATION	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
UNIT-BASED AND NONCASH COMPENSATION	13. 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. Significant items to note: •For the three-month period ended March 31, 2024, the Partnership granted 230,815 time-based phantom units and associated distribution equivalent rights to employees in connection with the Partnership’s annual incentive compensation award cycle. The grant date fair value of these awards totaled $3.7 million and the awards vest ratably over a 3-year period. •For the three-month period ended March 31, 2024, the Partnership granted 122,867 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 totaled $2.4 million and the awards vest at the end of three years. •For the three-month period ended March 31, 2024, the Partnership issued 39,486 common units to the Partnership’s six independent directors in connection with their annual compensation plan. The grant date fair value of these awards totaled $0.6 million and became fully vested at the grant date. •As of March 31, 2024, approximately 0.1 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.

COMMITMENTS AND CONTINGENCIES - Schedule of Environmental Matters (Details) - Meadowlark Midstream Gathering System $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Accrued environmental remediation, beginning balance	$ 2,937
Payments made	(226)
Changes in estimates	421
Accrued environmental remediation, ending balance	$ 3,132

DIVESTITURES	3 Months Ended
DIVESTITURES	Mar. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
DIVESTITURES	3. DIVESTITURES Summit Utica Sale. On March 22, 2024, the Partnership completed the disposition of Summit Utica, LLC (“Summit Utica”) to a subsidiary of MPLX LP (“MPLX”) for a cash sale price of $625.0 million, subject to customary post-closing adjustments (the “Utica Sale”). Summit Utica is the owner of (i) approximately 36% of the issued and outstanding equity interests in OGC, (ii) approximately 38% of the issued and outstanding equity interests in OCC, together with OGC, Ohio Gathering and (iii) midstream assets located in the Utica Shale. Ohio Gathering is the owner of a natural gas gathering system and condensate stabilization facility located in Belmont and Monroe counties in the Utica Shale in southeastern Ohio. During the quarterly period ended March 31, 2024, the Partnership recognized a total gain on the disposition of Summit Utica of $212.5 million based on total cash proceeds received of $625.0 million and net assets sold of $412.5 million. A portion of the cash proceeds was used to reduce amounts outstanding under the ABL Facility (see Note 8 - Debt, for additional information) and are subject to final working capital adjustments. The $625.0 million sale price did not discretely list values for either OGC, OCC or the Partnership’s midstream assets located in the Utica Shale. Using fair value methods allowed by GAAP, the Partnership derived a preliminary fair value estimate for the disposed assets and then determined the appropriate gain recognition amount for each disposal to include in its unaudited condensed consolidated financial statements. The estimated fair values were determined utilizing a discounted cash flow technique based on estimated revenues, costs, capital expenditures and an appropriate discount rate. Given the unobservable nature of the inputs, the fair value measurement is deemed to use Level 3 inputs. These fair value estimates are preliminary, and subject to change and such changes could be material. Based on these preliminary fair values, the Partnership recognized a gain on the disposition of the Utica midstream business of $86.2 million, which is recorded within gain on sale of business in the unaudited condensed consolidated statements of operations, and a gain of $126.3 million related to the disposition of Ohio Gathering, which is recorded within gain on sale of equity method investment in the unaudited condensed consolidated statements of operations.

DEBT (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of Debt

Debt for the Partnership at March 31, 2024 and December 31, 2023, follows:


	March 31, 2024		December 31, 2023
	(In thousands)
ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026	$	—	$	313,000

Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028	141,052		144,846
2026 Unsecured Notes: 12.00% senior unsecured notes due October 15, 2026	209,510		209,510
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025	49,783		49,783
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	(28,960)		(31,449)
Total debt, net of unamortized debt discount and debt issuance costs	1,156,385		1,470,690
Less: current portion of Permian Transmission Term Loan and 2026 Secured Notes tender	(29,098)		(15,524)
Total long-term debt	$	1,127,287	$	1,455,166

Schedule of Maturities of Long-term Debt

Below is a summary of the remaining mandatory principal repayments as of March 31, 2024:


(In thousands)	Total		2024		2025		2026		2027		2028
Amortizing principal repayments	$	141,052	$	11,730	$	16,580	$	16,967	$	17,769	$	78,006

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482949/835-30-55-8

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-8

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-6

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-7

+ Details

SUPPLEMENTAL CASH FLOW INFORMATION

3 Months Ended

Mar. 31, 2024

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

12. SUPPLEMENTAL CASH FLOW INFORMATION


	Three Months Ended March 31,
	2024		2023
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	9,210	$	9,420


Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	6,183	$	8,735
Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization	$	3,770	$	1,746

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total	$ 2,242,270	$ 2,468,607
Less: accumulated depreciation	(794,827)	(770,022)
Property, plant and equipment, net	1,447,443	1,698,585
Gathering and processing systems and related equipment
Property, Plant and Equipment [Line Items]
Total	2,124,517	2,335,980
Construction in progress
Property, Plant and Equipment [Line Items]
Total	41,888	56,064
Land and line fill
Property, Plant and Equipment [Line Items]
Total	11,546	11,534
Other
Property, Plant and Equipment [Line Items]
Total	$ 64,319	$ 65,029

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2020	Dec. 31, 2023
Partners Capital [Line Items]
Maximum period following end of quarter to distribute all available cash		45 days
Series A Preferred Units
Partners Capital [Line Items]
Subsidiary Series A preferred unitholders, outstanding (in shares)	65,508		65,508
Preferred units issued (in shares)	65,508		65,508
Series A Preferred Units
Partners Capital [Line Items]
Accrued and unpaid distributions	$ 36.3
Redemption amount	127.1
Issuance costs	$ 1.6		$ 1.7

PROPERTY, PLANT AND EQUIPMENT - Schedule of Depreciation Expense and Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 23,571	$ 22,918
Capitalized interest	$ 472	$ 193

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

3 Months Ended

Mar. 31, 2024

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures


	Three Months Ended March 31,
	2024		2023
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	9,210	$	9,420


Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	6,183	$	8,735
Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization	$	3,770	$	1,746

EQUITY METHOD INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2024

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

Details of the Partnership’s equity method investments follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Double E	$	273,476	$	276,221
Ohio Gathering	—		210,213
Total	$	273,476	$	486,434

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Partners' Capital and Schedule of Units (Details) - Common Units	3 Months Ended
	Mar. 31, 2024 shares
Increase (Decrease) in Partners' Capital [Roll Forward]
Units, beginning balance (in shares)	10,376,189
Common units issued for SMLP LTIP, net (in shares)	272,496
Units, ending balance (in shares)	10,648,685

EQUITY METHOD INVESTMENTS - Schedule of Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Gain on sale of equity method investment	$ 126,261	$ 0
Investment in equity method investees	273,476		$ 486,434
Double E
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	273,476		276,221
Ohio Gathering
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	$ 0		$ 210,213

FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

9. FINANCIAL INSTRUMENTS

Fair Value. A summary of the estimated fair value of our debt financial instruments follows.


	March 31, 2024				December 31, 2023
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(In thousands)

2025 Senior Notes	$	49,783	$	49,016	$	49,783	$	48,414
2026 Secured Notes	$	785,000	$	794,485	$	785,000	$	778,131
2026 Unsecured Notes	$	209,510	$	211,605	$	209,510	$	203,225

________

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

The carrying values on the balance sheets of the ABL Facility and Permian Transmission Term Loan represent their fair value due to their floating interest rates. The fair values of the 2026 Unsecured Notes, 2026 Secured Notes and 2025 Senior Notes are based on an average of nonbinding broker quotes as of March 31, 2024 and December 31, 2023. The use of different market assumptions or valuation methodologies may have a material effect on their estimated fair value of the Senior Notes.

Deferred earn-out. The Partnership’s deferred earn-out liability is remeasured each reporting period. As of March 31, 2024 and December 31, 2023, the estimated fair value of the deferred earn-out liability was $4.9 million and $5.1 million, respectively, and was estimated using a discounted cash flow technique based on estimated future freshwater deliveries and appropriate discount rates. 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, the Partnership entered into amortizing interest rate swap agreements. As of March 31, 2024 and December 31, 2023, the outstanding notional amounts of interest rate swaps were $126.9 million and $130.4 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.

As of March 31, 2024 and December 31, 2023, the Partnership’s interest rate swap agreements had a fair value of $13.2 million and $11.9 million, respectively, and are recorded within other noncurrent assets within the unaudited condensed consolidated balance sheets. The derivative instruments’ fair value are determined using level 2 inputs from the fair value hierarchy. For the three months ended March 31, 2024 and 2023, the Partnership recorded a gain on interest rate swaps of $2.6 million and a loss on interest rate swaps of $1.3 million, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 22, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of business	$ 86,202	$ 18
Proceeds from sale of business	292,266	0
Gain on sale of equity method investment	126,261	$ 0
Summit Utica \| OGC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest			36.00%
Summit Utica \| OCC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest			38.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of business	86,200
Net book value of assets and liabilities divested	143,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Summit Utica
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration			$ 625,000
Gain on disposition of business	212,500
Proceeds from sale of business	625,000
Net book value of assets and liabilities divested	$ 412,500

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	The Partnership prepares its condensed consolidated financial statements in accordance with GAAP as established by the FASB and pursuant to the rules and regulations of the SEC pertaining to interim financial information. The unaudited condensed consolidated financial statements contained in this report include all normal and recurring material adjustments that, in the opinion of management, are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented herein.
Use of Estimates	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.
Consolidation	The unaudited condensed 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.
Accounting standards recently implemented and New accounting standards not yet implemented	Accounting standards recently implemented. 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 provisions of ASU 2020-06 did not have a material impact on the Partnership’s condensed consolidated financial statements and disclosures. New accounting standards not yet implemented. 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.

DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Less: unamortized debt discount and debt issuance costs	$ (28,960)	$ (31,449)
Total debt, net of unamortized debt discount and debt issuance costs	1,156,385	1,470,690
Less: current portion of Permian Transmission Term Loan and 2026 Secured Notes tender	(29,098)	(15,524)
Total long-term debt	1,127,287	1,455,166
ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026 \| Line of Credit
Line of Credit Facility [Line Items]
Secured notes	0	313,000
Permian Transmission Term Loan and 2026 Secured Notes
Line of Credit Facility [Line Items]
Less: current portion of Permian Transmission Term Loan and 2026 Secured Notes tender	(29,098)	(15,524)
Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028
Line of Credit Facility [Line Items]
Term loan	141,052
Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028 \| Line of Credit
Line of Credit Facility [Line Items]
Term loan	141,052	144,846
2026 Unsecured Notes: $12.00% senior unsecured notes due October 15, 2026 \| Unsecured Debt
Line of Credit Facility [Line Items]
Unsecured notes	$ 209,510	$ 209,510
Stated interest rate (as a percent)	12.00%
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	5.75%	5.75%
2025 Senior Notes: 5.75% senior unsecured notes due April 15, 2025 \| Senior Notes
Line of Credit Facility [Line Items]
Unsecured notes	$ 49,783	$ 49,783
2026 Secured Notes: 8.50% senior second lien notes due October 15, 2026
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	8.50%	8.50%
2026 Secured Notes: 8.50% senior second lien notes due October 15, 2026 \| Secured Debt
Line of Credit Facility [Line Items]
Unsecured notes	$ 785,000	$ 785,000

REVENUE - Schedule of Estimated Revenue Expected to be Recognized (Details) - Gathering services and related fees $ in Thousands	Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 48,833
Revenue, remaining performance obligation, expected timing of satisfaction	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 45,594
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 29,292
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7,685
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5,137
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction	1 year

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP	3 Months Ended
	Mar. 31, 2024
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 There have been no changes to the Partnership’s significant accounting policies since December 31, 2023. Accounting standards recently implemented. 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 provisions of ASU 2020-06 did not have a material impact on the Partnership’s condensed consolidated financial statements and disclosures. New accounting standards not yet implemented. 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.

EARNINGS PER UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income (loss)	$ 132,927	$ (14,163)
Less: net income attributable to Series A Preferred Units	(3,220)	(2,639)
Net income (loss) attributable to Summit Midstream Partners, LP	129,157	(15,909)
Net income (loss) attributable to common limited partners	$ 125,937	$ (18,548)
Common units - basic (in shares)	10,449,000	10,213,000
Effect of nonvested phantom units (in shares)	531,000	0
Weighted-average common units outstanding – diluted (in shares)	10,980,000	10,213,000
Common unit - basic (in dollars per share)	$ 12.05	$ (1.82)
Common unit - diluted (in dollars per share)	$ 11.47	$ (1.82)
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU (in shares)	38	285

SEGMENT INFORMATION - Reconciliation of Net Loss to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting [Abstract]
Income (loss) before income taxes and equity method investment income	$ 122,499	$ (19,324)
Add:
Corporate and Other expense	15,096	9,796
Interest expense	37,846	34,223
Depreciation and amortization	28,102	30,059
Proportional adjusted EBITDA for equity method investees	20,675	11,638
Adjustments related to capital reimbursement activity	(2,923)	(1,186)
Unit-based and noncash compensation	2,772	1,929
Gain on asset sales, net	(27)	(68)
Gain on sale of business	(86,202)	0
Gain on sale of equity method investment	(126,261)	0
Long-lived asset impairments	67,916	0
Total of reportable segments' measures of profit	$ 79,493	$ 67,067

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ 132,927	$ (14,163)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	28,102	30,059
Noncash lease expense	1,009	784
Amortization of debt issuance costs	3,505	3,161
Unit-based and noncash compensation	2,772	1,929
Income from equity method investees	(10,638)	(4,909)
Distributions from equity method investees	17,082	10,403
Gain on asset sales, net	(27)	(68)
Foreign currency (gain) loss	19	(32)
Gain on sale of business	(86,202)	0
Gain on sale of equity method investment	(126,261)	0
Unrealized (gain) loss on interest rate swaps	(1,244)	2,417
Long-lived asset impairment	67,916	0
Changes in operating assets and liabilities:
Accounts receivable	2,961	12,377
Trade accounts payable	(3,497)	6,033
Accrued expenses	3,833	2,816
Deferred revenue, net	(2,293)	(1,082)
Ad valorem taxes payable	(5,261)	(6,990)
Accrued interest	25,528	21,961
Accrued environmental remediation, net	195	(289)
Other, net	(6,810)	(14,712)
Net cash provided by operating activities	43,616	49,695
Cash flows from investing activities:
Proceeds from sale of business	292,266	0
Capital expenditures	(16,398)	(16,438)
Proceeds from asset sale	27	0
Investment in Double E equity method investee	0	(3,500)
Other, net	0	(2,611)
Net cash provided by (used in) investing activities	608,629	(22,549)
Cash flows from financing activities:
Repayments on ABL Facility	(313,000)	(13,000)
Repayments on Permian Transmission Term Loan	(3,794)	(2,519)
Distributions on Subsidiary Series A Preferred Units	(1,628)	(1,628)
Debt issuance costs	0	(97)
Other, net	(2,424)	(150)
Net cash used in financing activities	(320,846)	(17,394)
Net change in cash, cash equivalents and restricted cash	331,399	9,752
Cash, cash equivalents and restricted cash, beginning of period	16,645	13,531
Cash, cash equivalents and restricted cash, end of period	348,044	23,283
Summit Utica
Cash flows from investing activities:
Proceeds from sale of equity method investment	$ 332,734	$ 0

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Change in Subsidiary (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption accretion, net of issuance cost amortization	$ 3,770	$ 1,746
Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	124,652
Cash distribution (includes a $1.6 million distribution payable as of March 31, 2024)	(1,628)
Ending balance	126,794
Distribution payable	$ 1,600

REVENUE (Tables)

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Estimated Revenue Expected to be Recognized and MVC Shortfall Payments


(In thousands)	2024		2025		2026		2027		2028		Thereafter

Gathering services and related fees	$	48,833	$	45,594	$	29,292	$	7,685	$	5,137	$	—

Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments


	Three Months Ended March 31, 2024
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	16,853	$	—	$	—	$	16,853
Rockies	16,516		47,970		4,108		68,594
Permian	—		—		910		910
Piceance	20,387		948		1,245		22,580
Barnett	8,229		174		1,457		9,860
Total reportable segments	61,985		49,092		7,720		118,797
Corporate and other	—		—		74		74
Total	$	61,985	$	49,092	$	7,794	$	118,871


	Three Months Ended March 31, 2023
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	12,755	$	—	$	—	$	12,755
Rockies	15,303		47,329		2,619		65,251
Permian	—		—		893		893
Piceance	19,119		1,641		1,426		22,186
Barnett	10,194		193		1,064		11,451
Total reportable segments	57,371		49,163		6,002		112,536
Corporate and other	—		—		(37)		(37)
Total	$	57,371	$	49,163	$	5,965	$	112,499

SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	Mar. 27, 2024	Nov. 02, 2021	Apr. 30, 2024	Mar. 31, 2024	Mar. 31, 2023	May 01, 2024	Apr. 24, 2024	Dec. 31, 2023
Subsequent Event [Line Items]
Long-lived asset impairments				$ 67,916	$ 0
Proceeds from divestiture of businesses				292,266	0
Current portion of long-term debt				29,098				$ 15,524
Proceeds from asset sale				27	$ 0
Secured Notes Indenture, 2026
Subsequent Event [Line Items]
Debt instrument, cash tender offer	$ 19,300
Redemption price, expressed as percentage of principal amount	100.00%	108.50%
Subsequent Event \| Secured Notes Indenture, 2026
Subsequent Event [Line Items]
Current portion of long-term debt							$ 13,600
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Subsequent Event [Line Items]
Long-lived asset impairments				68,000
Net book value of assets and liabilities divested				143,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Mountaineer Midstream Company, LLC
Subsequent Event [Line Items]
Proceeds from divestiture of businesses				$ 75,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Mountaineer Midstream Company, LLC \| Subsequent Event
Subsequent Event [Line Items]
Cash consideration						$ 70,000
Proceeds from asset sale			$ 5,000

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Common Limited Partners Capital	Common Limited Partners Capital Series A Preferred Units
Beginning balance at Dec. 31, 2022	$ 764,818	$ 679,491	$ 85,327
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(15,909)	(18,548)	2,639
Unit-based compensation	1,929	1,929	0
Tax withholdings and associated payments on vested SMLP LTIP awards	(1,136)	(1,136)	0
Ending balance at Mar. 31, 2023	749,702	661,736	87,966
Beginning balance at Dec. 31, 2023	718,563	621,670	96,893
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	129,157	125,937	3,220
Unit-based compensation	2,772	2,772	0
Tax withholdings and associated payments on vested SMLP LTIP awards	(1,878)	(1,878)	0
Ending balance at Mar. 31, 2024	$ 848,614	$ 748,501	$ 100,113

DEBT - Narrative (Details)				1 Months Ended			3 Months Ended
DEBT - Narrative (Details)	Apr. 01, 2024	Mar. 27, 2024 USD ($)	Nov. 02, 2021 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2021 USD ($)	Feb. 28, 2017	Mar. 31, 2024 USD ($)	Apr. 24, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 08, 2021 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt							$ 29,098,000		$ 15,524,000
Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)							3.25%
ABL Facility
Debt Instrument [Line Items]
Borrowing capacity			$ 400,000,000				$ 400,000,000
Borrowing base capacity							$ 683,600,000
Mandatory redemption period							120 days
Maximum amount of debt outstanding for maturity to occur							$ 50,000,000
Debt instrument, interest rate							8.69%
Unused portion under the facility							$ 383,700,000
Debt instrument, covenant, unrestricted cash threshold			$ 200,000,000
Interest coverage ratio							1.87
Interest coverage ratio, thereafter			1.90
First lien net leverage ratio (as a percent)			2.50				(0.26)
ABL Facility \| Exceeds cash threshold
Debt Instrument [Line Items]
Interest coverage ratio			1.50
ABL Facility \| Less than cash threshold
Debt Instrument [Line Items]
Interest coverage ratio			1.75
ABL Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Secured notes							$ 4,300,000
ABL Facility \| Other Credit Facility Reserves
Debt Instrument [Line Items]
Secured notes							12,000,000
2025 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Unsecured notes							$ 49,800,000
Credit Agreement
Debt Instrument [Line Items]
Borrowing capacity												$ 175,000,000
Interest rate during period (as a percent)							7.79%
Unused portion of the permian transmission credit facility							$ 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 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)							2.475%
Commitment fee (as a percent)							0.70%
Credit Agreement \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Summit Permian Transmission, LLC \| Interest Rate Contract
Debt Instrument [Line Items]
Applicable margin (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
Credit Agreement \| Standby Letters of Credit
Debt Instrument [Line Items]
Unused portion of the permian transmission credit facility							$ 10,500,000
Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028
Debt Instrument [Line Items]
Interest rate during period (as a percent)							7.79%
Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)							2.475%
2026 Notes
Debt Instrument [Line Items]
Debt offering										$ 85,000,000	$ 700,000,000
Stated interest rate (as a percent)											8.50%
Debt issued as a percent of face value										99.26%	98.50%
Secured Notes Indenture, 2026
Debt Instrument [Line Items]
Debt instrument, interest rate	9.50%
Redemption price, expressed as percentage of principal amount		100.00%	108.50%
Debt instrument, principal interest rate					100.00%
Debt instrument, covenant, excess cash flow offer to purchase, period one					$ 50,000,000
Debt instrument, covenant, excess cash flow offer to purchase, basis point increase, period one	0.50%				0.50%
Debt instrument, covenant, excess cash flow offer to purchase, period two					$ 100,000,000
Debt instrument, covenant, excess cash flow offer to purchase, basis point increase, period two					1.00%
Debt instrument, covenant, excess cash flow offer to purchase, period three					$ 200,000,000
Debt instrument, covenant, excess cash flow offer to purchase, basis point increase, period three					2.00%
Debt instrument, cash tender offer		$ 19,300,000
Redemption percentage (as a percent)			35.00%
Debt Instrument, Covenant, Redemption, Percent of Initial Principal Amount Remaining Outstanding			65.00%
Secured Notes Indenture, 2026 \| Subsequent Event
Debt Instrument [Line Items]
Current portion of long-term debt								$ 13,600,000
Secured Notes Indenture, 2026 \| Beginning October 15, 2023
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount					104.25%
Secured Notes Indenture, 2026 \| Beginning October 15, 2024
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount					102.125%
Secured Notes Indenture, 2026 \| Beginning October 15, 2025
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount					100.00%
2026 Unsecured Notes
Debt Instrument [Line Items]
Debt offering				$ 209,500,000
2026 Unsecured Notes \| Beginning October 15, 2023 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount				101.00%
2026 Unsecured Notes \| Beginning October 15, 2024 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount				102.00%
2025 Senior Notes
Debt Instrument [Line Items]
Debt offering				$ 180,000,000
Debt instrument, repurchase amount				29,500,000
Debt instrument, repurchased face amount				$ 29,700,000
2025 Senior Notes \| Beginning October 15, 2025 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount						100.00%

PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

5. PROPERTY, PLANT AND EQUIPMENT

Details on the Partnership’s property, plant and equipment follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Gathering and processing systems and related equipment	$	2,124,517	$	2,335,980
Construction in progress	41,888		56,064
Land and line fill	11,546		11,534
Other	64,319		65,029
Total	2,242,270		2,468,607
Less: accumulated depreciation	(794,827)		(770,022)
Property, plant and equipment, net	$	1,447,443	$	1,698,585

Depreciation expense and capitalized interest for the Partnership follow.


	Three Months Ended March 31,
	2024		2023
	(In thousands)
Depreciation expense	$	23,571	$	22,918
Capitalized interest	472		193

PARTNERS' CAPITAL AND MEZZANINE CAPITAL

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

PARTNERS' CAPITAL AND MEZZANINE CAPITAL

10. PARTNERS' CAPITAL AND MEZZANINE CAPITAL

Common Units. An update on the number of common units is as follows for the period from December 31, 2023 to March 31, 2024.


			Common Units
Units, December 31, 2023			10,376,189

Common units issued for SMLP LTIP, net			272,496
Units, March 31, 2024			10,648,685

Series A Preferred Units. As of March 31, 2024, the Partnership had 65,508 Series A Preferred Units outstanding and $36.3 million of accrued and unpaid distributions on its Series A Preferred Units.

Subsidiary Series A Preferred Units. 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.

As of March 31, 2024, the Partnership had 93,039 Subsidiary Series A Preferred Units issued and outstanding.

If the Subsidiary Series A Preferred Units were redeemed on March 31, 2024, the redemption amount would be $127.1 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.


	(In thousands)
Balance at December 31, 2023	$	124,652
Redemption accretion, net of issuance cost amortization	3,770
Cash distribution (includes a $1.6 million distribution payable as of March 31, 2024)	(1,628)
Balance at March 31, 2024	$	126,794

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 ended 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. There were no distributions paid during the three months ended March 31, 2024 or during the twelve months ended December 31, 2023.

FINANCIAL INSTRUMENTS - Fair Value of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
2025 Senior Notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 49,783	$ 49,783
2025 Senior Notes \| Fair Value \| Estimated Fair Value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	49,016	48,414
2026 Secured Notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	785,000	785,000
2026 Secured Notes \| Fair Value \| Estimated Fair Value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	794,485	778,131
2026 Unsecured Notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	209,510	209,510
2026 Unsecured Notes \| Fair Value \| Estimated Fair Value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 211,605	$ 203,225

FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Concentration Risk [Line Items]
Gain (loss) on interest rate swaps	$ 2,590	$ (1,273)
Fair Value, Inputs, Level 3 \| Sterling DJ
Concentration Risk [Line Items]
Deferred earn-out liability	4,900		$ 5,100
Interest Rate Swap
Concentration Risk [Line Items]
Derivative liability, notional amount	126,900		130,400
Fair value of interest rate swap	13,200		$ 11,900
Gain (loss) on interest rate swaps	$ 2,600

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References + Details

SEGMENT INFORMATION - Assets, Revenues, Depreciation and Amortization, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Assets	$ 2,320,575	$ 2,494,198
Reportable Segments
Segment Reporting Information [Line Items]
Assets	1,973,633	2,483,258
Reportable Segments \| Rockies
Segment Reporting Information [Line Items]
Assets	906,854	904,974
Reportable Segments \| Permian
Segment Reporting Information [Line Items]
Assets	290,168	291,073
Reportable Segments \| Northeast
Segment Reporting Information [Line Items]
Assets	80,460	573,663
Reportable Segments \| Piceance
Segment Reporting Information [Line Items]
Assets	419,773	431,687
Reportable Segments \| Barnett
Segment Reporting Information [Line Items]
Assets	276,378	281,861
Corporate and Other
Segment Reporting Information [Line Items]
Assets	$ 346,942	$ 10,940

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

DEFERRED REVENUE (Tables)

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Contract with Customer, Contract Asset, Contract Liability, and Receivable

An update of current deferred revenue follows.


	Total
	(In thousands)
Current deferred revenue, December 31, 2023	$	10,196
Add: additions	1,696
Less: revenue recognized and other	(2,993)
Current deferred revenue, March 31, 2024	$	8,899

An update of noncurrent deferred revenue follows.


	Total
	(In thousands)
Noncurrent deferred revenue, December 31, 2023	$	30,085
Add: additions	563
Less: reclassification to current deferred revenue and other	(1,887)
Noncurrent deferred revenue, March 31, 2024	$	28,761

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Supplemental cash flow information:
Cash interest paid	$ 9,210	$ 9,420
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	6,183	8,735
Series A Preferred Units
Noncash investing and financing activities:
Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization	$ 3,770	$ 1,746

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

SEGMENT INFORMATION

15. SEGMENT INFORMATION

As of March 31, 2024, the Partnership’s 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 Marcellus shale play and its wholly owned midstream assets located in the Utica shale play together with its equity method investment in Ohio Gathering that is focused on the Utica Shale. For additional information regarding the Utica Sale, see Note 3 - Divestitures regarding the disposition of Northeast assets.

•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 our reportable segments, including certain general and administrative expense items, transaction costs, acquisition integration costs and interest expense.

Assets by reportable segment follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Assets:
Rockies	$	906,854	$	904,974
Permian	290,168		291,073
Northeast	80,460		573,663
Piceance	419,773		431,687
Barnett	276,378		281,861
Total reportable segment assets	1,973,633		2,483,258
Corporate and Other	346,942		10,940
Total assets	$	2,320,575	$	2,494,198

Segment adjusted EBITDA by reportable segment follows.


	Three Months Ended March 31,
		2024		2023
		(In thousands)
Reportable segment adjusted EBITDA
Rockies		$	22,874	$	23,130
Permian		7,265		5,073
Northeast		29,021		17,854
Piceance		15,233		13,983
Barnett		5,100		7,027
Total of reportable segments' measures of profit		$	79,493	$	67,067

A reconciliation of income or loss before income taxes and income from equity method investees to total of reportable segments' measures of profit follows.


	Three Months Ended March 31,
			2024		2023
		(In thousands)
Reconciliation of loss before income taxes and income from equity method
investees to total of reportable segments' measures of profit:
Income (loss) before income taxes and income from equity method investees			$	122,499	$	(19,324)
Add:
Corporate and Other expense			15,096		9,796
Interest expense			37,846		34,223
Depreciation and amortization (1)			28,102		30,059
Proportional adjusted EBITDA for equity method investees			20,675		11,638
Adjustments related to capital reimbursement activity			(2,923)		(1,186)
Unit-based and noncash compensation			2,772		1,929
Gain on asset sales, net			(27)		(68)
Gain on sale of business			(86,202)		—
Gain on sale of equity method investment			(126,261)		—
Long-lived asset impairment			67,916		—
Total of reportable segments' measures of profit			$	79,493	$	67,067

________

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

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

DEBT - Schedule of Maturities (Details) - Permian Transmission Term Loan: Summit Permian Transmission's variable rate senior secured term loan due January 2028 $ in Thousands	Mar. 31, 2024 USD ($)
Debt
Amortizing principal repayments	$ 141,052
2024	11,730
2025	16,580
2026	16,967
2027	17,769
2028	$ 78,006

EARNINGS PER UNIT

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

EARNINGS PER UNIT

11. EARNINGS PER UNIT

The following table details the components of EPU.


	Three Months Ended March 31,
		2024		2023
		(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net income (loss)		$	132,927	$	(14,163)
Less: Net income attributable to Subsidiary Series A Preferred Units		(3,770)		(1,746)
Net income (loss) attributable to Summit Midstream Partners, LP		$	129,157	(15,909)

Less: Net income attributable to Series A Preferred Units		$	(3,220)	(2,639)


Net income (loss) attributable to common limited partners		$	125,937	$	(18,548)

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic		10,449		10,213
Effect of nonvested phantom units		531		—
Weighted-average common units outstanding – diluted		10,980		10,213

Net income (loss) per limited partner unit:
Common unit – basic		$	12.05	$	(1.82)
Common unit – diluted		$	11.47	$	(1.82)

Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU		38		285

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Schedule of Reconciliation of Assets from Segment to Consolidated

Assets by reportable segment follow.


	March 31, 2024		December 31, 2023
	(In thousands)
Assets:
Rockies	$	906,854	$	904,974
Permian	290,168		291,073
Northeast	80,460		573,663
Piceance	419,773		431,687
Barnett	276,378		281,861
Total reportable segment assets	1,973,633		2,483,258
Corporate and Other	346,942		10,940
Total assets	$	2,320,575	$	2,494,198

Schedule of Reconciliation of Net Income to Adjusted EBITDA

Segment adjusted EBITDA by reportable segment follows.


	Three Months Ended March 31,
		2024		2023
		(In thousands)
Reportable segment adjusted EBITDA
Rockies		$	22,874	$	23,130
Permian		7,265		5,073
Northeast		29,021		17,854
Piceance		15,233		13,983
Barnett		5,100		7,027
Total of reportable segments' measures of profit		$	79,493	$	67,067

A reconciliation of income or loss before income taxes and income from equity method investees to total of reportable segments' measures of profit follows.


	Three Months Ended March 31,
			2024		2023
		(In thousands)
Reconciliation of loss before income taxes and income from equity method
investees to total of reportable segments' measures of profit:
Income (loss) before income taxes and income from equity method investees			$	122,499	$	(19,324)
Add:
Corporate and Other expense			15,096		9,796
Interest expense			37,846		34,223
Depreciation and amortization (1)			28,102		30,059
Proportional adjusted EBITDA for equity method investees			20,675		11,638
Adjustments related to capital reimbursement activity			(2,923)		(1,186)
Unit-based and noncash compensation			2,772		1,929
Gain on asset sales, net			(27)		(68)
Gain on sale of business			(86,202)		—
Gain on sale of equity method investment			(126,261)		—
Long-lived asset impairment			67,916		—
Total of reportable segments' measures of profit			$	79,493	$	67,067

________

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

(2) The Partnership records financial results of its investment in Ohio Gathering on a one-month lag and is based on the financial information available to us during the reporting period. With the divestiture of Ohio Gathering in March 2024, proportional adjusted EBITDA includes financial results from December 1, 2023 through March 22, 2024.

DEFERRED REVENUE

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

DEFERRED REVENUE

7. DEFERRED REVENUE

Certain of the Partnership’s gathering and/or processing agreements provide for monthly or annual MVCs. 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.

The balances in deferred revenue as of March 31, 2024 and December 31, 2023 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 follows.


	Total
	(In thousands)
Current deferred revenue, December 31, 2023	$	10,196
Add: additions	1,696
Less: revenue recognized and other	(2,993)
Current deferred revenue, March 31, 2024	$	8,899

An update of noncurrent deferred revenue follows.


	Total
	(In thousands)
Noncurrent deferred revenue, December 31, 2023	$	30,085
Add: additions	563
Less: reclassification to current deferred revenue and other	(1,887)
Noncurrent deferred revenue, March 31, 2024	$	28,761

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2024	Apr. 30, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,648,685
Entity Central Index Key	0001549922
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) claim
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
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
Natural Resource Damages To Federal and State Governments \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 1,250
Penalties and fines, payment period	5 years
Damages Payable To Federal Government over Five Years \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 25,000
Damages Payable To State Governments Over Six Years \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 10,000
Penalties and fines, payment period	6 years
Damages Payable To Federal Criminal Over Five Years \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Penalties and fines, payment period	5 years