10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended June 30, 2023

OR

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

For the transition period from _______ to _______

Commission File Number 1-16417

_________________________________________

NuStar Energy L.P.

(Exact name of registrant as specified in its charter)

_________________________________________

Delaware	74-2956831
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

19003 IH-10 West

San Antonio, Texas

(Address of principal executive offices)

78257

(Zip Code)

Registrant’s telephone number, including area code (210) 918-2000

 _______________________________________

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Units	NS	New York Stock Exchange
8.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprA	New York Stock Exchange
7.625% Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprB	New York Stock Exchange
9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprC	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes þ    No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes þ    No o

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

Large accelerated filer	þ	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

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

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

The number of common units outstanding as of July 31, 2023 was 110,907,171.

NUSTAR ENERGY L.P.

FORM 10-Q

TABLE OF CONTENTS

PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements	3
	Consolidated Balance Sheets as of June 30, 2023 and December 31, 2022	3
	Condensed Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2023 and 2022	4
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2023 and 2022	5
	Consolidated Statements of Partners’ Equity and Mezzanine Equity for the Three and Six Months Ended June 30, 2023 and 2022	6
	Condensed Notes to Consolidated Financial Statements	8
	1. Organization and Basis of Presentation	8
	2. Dispositions	8
	3. Revenue from Contracts with Customers	10
	4. Debt	11
	5. Commitments and Contingencies	12
	6. Series D Cumulative Convertible Preferred Units	12
	7. Partners' Equity	14
	8. Net Income (Loss) per Common Unit	16
	9. Supplemental Cash Flow Information	17
	10. Segment Information	18
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
	Cautionary Statement Regarding Forward-Looking Information	20
	Overview	20
	Results of Operations	23
	Liquidity and Capital Resources	29
	Critical Accounting Policies	35
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	36
Item 4.	Controls and Procedures	37
PART II – OTHER INFORMATION
Item 5.	Other Information	38
Item 6.	Exhibits	39
SIGNATURES		40

2

PART I – FINANCIAL INFORMATION

Item 1.Financial Statements

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited, Thousands of Dollars, Except Unit Data)

	June 30, 2023		December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	3,813	$	14,489
Accounts receivable, net	125,116		149,971
Inventories	10,477		15,397
Prepaid and other current assets	27,548		24,067
Total current assets	166,954		203,924
Property, plant and equipment, at cost	5,693,440		5,733,685
Accumulated depreciation and amortization	(2,397,938)		(2,330,602)
Property, plant and equipment, net	3,295,502		3,403,083
Intangible assets, net	494,880		513,696
Goodwill	732,356		732,356
Other long-term assets, net	200,723		120,627
Total assets	$	4,890,415	$	4,973,686
Liabilities, Mezzanine Equity and Partners’ Equity
Current liabilities:
Accounts payable	$	64,938	$	67,765
Current portion of finance leases	4,677		4,416
Accrued interest payable	38,476		37,607
Accrued liabilities	66,168		76,072
Taxes other than income tax	7,695		10,607
Total current liabilities	181,954		196,467
Long-term debt, less current portion of finance leases	3,310,561		3,293,415
Deferred income tax liability	3,262		3,219
Mandatorily redeemable Series D preferred units (Note 6)	81,229		—
Other long-term liabilities	213,828		131,299
Total liabilities	3,790,834		3,624,400
Commitments and contingencies (Note 5)
Series D preferred limited partners (Note 6)	230,264		446,970
Partners’ equity (Note 7):
Preferred limited partners
Series A (9,060,000 units outstanding as of June 30, 2023 and December 31, 2022)	218,307		218,307
Series B (15,400,000 units outstanding as of June 30, 2023 and December 31, 2022)	371,476		371,476
Series C (6,900,000 units outstanding as of June 30, 2023 and December 31, 2022)	166,518		166,518
Common limited partners (110,906,500 and 110,818,718 units outstanding as of June 30, 2023 and December 31, 2022, respectively)	144,409		177,620
Accumulated other comprehensive loss	(31,393)		(31,605)
Total partners’ equity	869,317		902,316
Total liabilities, mezzanine equity and partners’ equity	$	4,890,415	$	4,973,686

See Condensed Notes to Consolidated Financial Statements.

3

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited, Thousands of Dollars, Except Unit and Per Unit Data)

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Revenues:
Service revenues	$	275,367	$	278,067	$	560,633	$	543,372
Product sales	102,967		152,090		211,568		296,648
Total revenues	378,334		430,157		772,201		840,020
Costs and expenses:
Costs associated with service revenues:
Operating expenses (excluding depreciation and amortization expense)	93,363		94,948		182,525		181,350
Depreciation and amortization expense	62,530		62,240		124,584		125,543
Total costs associated with service revenues	155,893		157,188		307,109		306,893
Costs associated with product sales	86,914		134,178		180,375		260,893
Impairment loss	—		—		—		46,122
General and administrative expenses (excluding depreciation and amortization expense)	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total costs and expenses	275,464		321,098		550,421		672,535
Gain on sale of assets	—		—		41,075		—
Operating income	102,870		109,059		262,855		167,485
Interest expense, net	(58,170)		(50,941)		(115,541)		(100,759)
Other income, net	2,633		2,012		7,142		5,683
Income before income tax expense	47,333		60,130		154,456		72,409
Income tax expense	1,192		931		2,379		898
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Basic and diluted net (loss) income per common unit (Note 8)	$	(0.20)	$	0.20	$	0.42	$	(0.02)
Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201
Comprehensive income	$	46,149	$	100,073	$	152,289	$	113,317

See Condensed Notes to Consolidated Financial Statements.

4

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, Thousands of Dollars)

	Six Months Ended June 30,
	2023		2022
Cash flows from operating activities:
Net income	$	152,077	$	71,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	127,176		129,190
Amortization of unit-based compensation	7,302		6,746
Amortization of debt related items	5,224		5,085
Gain on sale of assets	(41,075)		—
Impairment loss	—		46,122
Changes in current assets and current liabilities (Note 9)	1,785		(30,940)
Decrease in other long-term assets, net	5,692		6,626
Increase (decrease) in other long-term liabilities	796		(6,218)
Other, net	(6,672)		(5,835)
Net cash provided by operating activities	252,305		222,287
Cash flows from investing activities:
Capital expenditures	(54,532)		(71,425)
Change in accounts payable related to capital expenditures	1,450		(8,716)
Proceeds from insurance recoveries	12,395		5,805
Proceeds from sale or disposition of assets, net of transaction costs	102,769		59,531
Net cash provided by (used in) investing activities	62,082		(14,805)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	443,000		480,400
Long-term debt repayments	(427,700)		(528,100)
Redemption of Series D preferred units	(174,515)		—
Distributions to preferred unitholders	(64,890)		(62,432)
Distributions to common unitholders	(88,724)		(88,164)
Other, net	(12,376)		(11,243)
Net cash used in financing activities	(325,205)		(209,539)
Effect of foreign exchange rate changes on cash	310		763
Net decrease in cash, cash equivalents and restricted cash	(10,508)		(1,294)
Cash, cash equivalents and restricted cash as of the beginning of the period	23,377		14,439
Cash, cash equivalents and restricted cash as of the end of the period	$	12,869	$	13,145

See Condensed Notes to Consolidated Financial Statements.

5

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY AND MEZZANINE EQUITY

Three Months Ended June 30, 2023 and 2022

(Unaudited, Thousands of Dollars, Except Per Unit Data)

	Limited Partners								Mezzanine Equity
	Preferred		Common		Accumulated Other Comprehensive Loss		Total Partners’ Equity (Note 7)		Series D Preferred Limited Partners (Note 6)		Total
Balance as of April 1, 2023	$	756,301	$	207,164	$	(31,401)	$	932,064	$	450,641	$	1,382,705
Net income	22,112		14,015		—		36,127		10,014		46,141
Other comprehensive income	—		—		8		8		—		8
Distributions to partners:
Series A, B and C preferred	(22,112)		—		—		(22,112)		—		(22,112)
Common ($0.40 per unit)	—		(44,362)		—		(44,362)		—		(44,362)
Series D preferred	—		—		—		—		(10,014)		(10,014)
Unit-based compensation	—		3,006		—		3,006		—		3,006
Series D preferred unit accretion	—		(3,303)		—		(3,303)		3,303		—
Series D preferred unit redemption	—		(32,067)		—		(32,067)		(223,677)		(255,744)
Other	—		(44)		—		(44)		(3)		(47)
Balance as of June 30, 2023	$	756,301	$	144,409	$	(31,393)	$	869,317	$	230,264	$	1,099,581

Balance as of April 1, 2022	$	756,301	$	239,010	$	(73,046)	$	922,265	$	621,018	$	1,543,283
Net income	15,669		27,676		—		43,345		15,854		59,199
Other comprehensive income	—		—		40,874		40,874		—		40,874
Distributions to partners:
Series A, B and C preferred	(15,669)		—		—		(15,669)		—		(15,669)
Common ($0.40 per unit)	—		(44,123)		—		(44,123)		—		(44,123)
Series D preferred	—		—		—		—		(15,854)		(15,854)
Unit-based compensation	—		2,681		—		2,681		—		2,681
Series D preferred unit accretion	—		(4,734)		—		(4,734)		4,734		—
Other	—		1		—		1		(1)		—
Balance as of June 30, 2022	$	756,301	$	220,511	$	(32,172)	$	944,640	$	625,751	$	1,570,391

See Condensed Notes to Consolidated Financial Statements.

6

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY AND MEZZANINE EQUITY

Six Months Ended June 30, 2023 and 2022

(Unaudited, Thousands of Dollars, Except Per Unit Data)

	Limited Partners								Mezzanine Equity
	Preferred		Common		Accumulated Other Comprehensive Loss		Total Partners’ Equity (Note 7)		Series D Preferred Limited Partners (Note 6)		Total
Balance as of January 1, 2023	$	756,301	$	177,620	$	(31,605)	$	902,316	$	446,970	$	1,349,286
Net income	43,696		87,218		—		130,914		21,163		152,077
Other comprehensive income	—		—		212		212		—		212
Distributions to partners:
Series A, B and C preferred	(43,696)		—		—		(43,696)		—		(43,696)
Common ($0.80 per unit)	—		(88,724)		—		(88,724)		—		(88,724)
Series D preferred	—		—		—		—		(21,163)		(21,163)
Unit-based compensation	—		7,390		—		7,390		—		7,390
Series D preferred unit accretion	—		(6,974)		—		(6,974)		6,974		—
Series D preferred unit redemption	—		(32,067)		—		(32,067)		(223,677)		(255,744)
Other	—		(54)		—		(54)		(3)		(57)
Balance as of June 30, 2023	$	756,301	$	144,409	$	(31,393)	$	869,317	$	230,264	$	1,099,581

Balance as of January 1, 2022	$	756,301	$	299,502	$	(73,978)	$	981,825	$	616,439	$	1,598,264
Net income	30,907		8,896		—		39,803		31,708		71,511
Other comprehensive income	—		—		41,806		41,806		—		41,806
Distributions to partners:
Series A, B and C preferred	(30,907)		—		—		(30,907)		—		(30,907)
Common ($0.80 per unit)	—		(88,164)		—		(88,164)		—		(88,164)
Series D preferred	—		—		—		—		(31,708)		(31,708)
Unit-based compensation	—		9,591		—		9,591		—		9,591
Series D preferred unit accretion	—		(9,315)		—		(9,315)		9,315		—
Other	—		1		—		1		(3)		(2)
Balance as of June 30, 2022	$	756,301	$	220,511	$	(32,172)	$	944,640	$	625,751	$	1,570,391

See Condensed Notes to Consolidated Financial Statements.

7

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. ORGANIZATION AND BASIS OF PRESENTATION

Organization and Operations

NuStar Energy L.P. (NYSE: NS) is a Delaware limited partnership primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole. Our business is managed under the direction of the board of directors of NuStar GP, LLC, the general partner of our general partner, Riverwalk Logistics, L.P., both of which are indirectly wholly owned subsidiaries of ours.

We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing.

Recent Developments

Partial Redemptions of Series D Preferred Units. On June 30, 2023, we redeemed an aggregate 5,500,000 of our Series D Cumulative Convertible Preferred Units (Series D Preferred Units), at a price per unit of $31.88, for an aggregate purchase price of $175.3 million. On June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem an aggregate 2,560,000 of our Series D Preferred Units, at a price per unit of $32.18 for an aggregate purchase price of $82.4 million. This redemption closed on July 31, 2023. Please see Note 6 for additional information on these redemptions.

Debt Amendments. On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement, mainly to extend the maturity date from April 27, 2025 to January 27, 2027. On June 29, 2023, we amended our $100.0 million receivables financing agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. Please refer to Note 4 for more information.

Basis of Presentation

These unaudited condensed consolidated financial statements include the accounts of the Partnership and subsidiaries in which the Partnership has a controlling interest. Inter-partnership balances and transactions have been eliminated in consolidation.

These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, and all disclosures are adequate. All such adjustments are of a normal recurring nature unless disclosed otherwise. Operating results for the six months ended June 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2022.

2. DISPOSITIONS

Sale-Leaseback Transaction

On March 21, 2023, we sold our corporate headquarters facility and approximately 24 acres of underlying land located in San Antonio, Texas (the Corporate Headquarters) for an aggregate cash sales price of approximately $103.0 million and immediately leased back the Corporate Headquarters for an initial term of twenty years, with two renewal options of ten years each (the Sale-Leaseback Transaction). Upon closing of the sale in the first quarter of 2023, the Sale-Leaseback Transaction qualified as a completed sale, and we recognized a gain of $41.1 million, which is presented in “Gain on sale of assets” on the condensed consolidated statements of comprehensive income. We entered into the Sale-leaseback Transaction in order to monetize the Corporate Headquarters and used the proceeds to repay borrowings on our revolving credit agreement.

8

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Pursuant to the lease agreement, rent for the initial term starts at $6.4 million per year and increases annually by 2.5%. At inception of the lease, right-of-use assets and lease liabilities associated with the Sale-Leaseback Transaction assumed a reasonably certain term of 20 years and were included in our consolidated balance sheet as follows (thousands of dollars):

Operating lease right-of-use assets:
Other long-term assets, net	$	82,230
Operating lease liabilities:
Accrued liabilities	$	710
Other long-term liabilities	81,498
Total operating lease liabilities	$	82,208

Following our entrance into the Sale-Leaseback Transaction, the weighted-average discount rate for our operating leases was 6.1%.

Point Tupper Terminal Disposition

On April 29, 2022, we sold the equity interests in our wholly owned subsidiaries that owned our Point Tupper terminal facility in Nova Scotia, Canada (the Point Tupper Terminal Operations) to EverWind Fuels for $60.0 million. The terminal facility had a storage capacity of 7.8 million barrels and was included in the storage segment. We used the sales proceeds to reduce debt and improve our debt metrics.

During the first quarter of 2022, we determined the Point Tupper Terminal Operations met the criteria to be classified as held for sale. We compared the carrying value of the Point Tupper Terminal Operations, which included $42.2 million in cumulative foreign currency translation losses accumulated since our acquisition of the Point Tupper terminal facility in 2005, to its fair value less costs to sell, and we recognized a pre-tax impairment loss of $46.1 million in the first quarter of 2022, which is presented in "Impairment loss" on the condensed consolidated statements of comprehensive income. We believe that the sales price of $60.0 million provided a reasonable indication of the fair value of the Point Tupper Terminal Operations as it represented an exit price in an orderly transaction between market participants. The sales price was a quoted price for identical assets and liabilities in a market that was not active and, thus, our fair value estimate fell within Level 2 of the fair value hierarchy. Upon closing in the second quarter of 2022, we released $39.6 million of foreign currency translation losses from accumulated other comprehensive loss and finalized our sales price, resulting in a gain of $1.6 million, which was presented in “Other income, net” on the condensed consolidated statement of comprehensive income for the period.

9

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

3. REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract Assets and Contract Liabilities

The following table provides information about contract assets and contract liabilities from contracts with customers:

	2023				2022
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,612	$	(17,647)	$	2,336	$	(15,443)
Noncurrent portion	304		(41,405)		504		(46,027)
Total	2,916		(59,052)		2,840		(61,470)
Activity:
Additions	3,782		(45,998)		2,112		(17,692)
Transfer to accounts receivable	(2,856)		—		(2,198)		—
Transfer to revenues	—		33,718		(83)		24,841
Total	926		(12,280)		(169)		7,149
Balances as of June 30:
Current portion	2,703		(27,379)		2,251		(13,555)
Noncurrent portion	1,139		(43,953)		420		(40,766)
Total	$	3,842	$	(71,332)	$	2,671	$	(54,321)

Current contract assets are included in “Prepaid and other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheets. The current portion of contract liabilities is included in “Accrued liabilities” and the noncurrent portion of contract liabilities is included in “Other long-term liabilities” on the consolidated balance sheets.

Remaining Performance Obligations

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2023:

	Remaining Performance Obligations
	(Thousands of Dollars)
2023 (remaining)	$	204,812
2024	337,666
2025	229,535
2026	163,771
2027	81,059
Thereafter	124,800
Total	$	1,141,643

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to customer contracts that have fixed pricing and fixed volume terms and conditions, including contracts with payment obligations for minimum volume commitments.

10

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Disaggregation of Revenues

The following table disaggregates our revenues:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	93,186	$	94,010	$	189,789	$	180,134
Refined products and ammonia pipelines	113,515		106,555		230,095		209,114
Total pipeline segment revenues from contracts with customers	206,701		200,565		419,884		389,248
Storage segment:
Throughput terminals	23,839		30,929		51,154		57,370
Storage terminals (excluding lessor revenues)	43,049		47,089		85,065		97,808
Total storage segment revenues from contracts with customers	66,888		78,018		136,219		155,178
Lessor revenues	11,321		10,765		22,647		21,526
Total storage segment revenues	78,209		88,783		158,866		176,704
Fuels marketing segment:
Revenues from contracts with customers	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

4. DEBT

Revolving Credit Agreement

On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement (the Revolving Credit Agreement), mainly to extend the maturity date from April 27, 2025 to January 27, 2027. The amendment also includes a requirement that we certify that the sum of our Revolving Credit Agreement availability and unrestricted cash balance is no less than $150.0 million on a pro forma basis prior to using any borrowings under the Revolving Credit Agreement to redeem certain unsecured indebtedness or our Series D Preferred Units.

As of June 30, 2023, the Revolving Credit Agreement had $750.4 million available for borrowing and $245.0 million of borrowings outstanding. Letters of credit issued under the Revolving Credit Agreement totaled $4.6 million as of June 30, 2023 and limit the amount we can borrow under the Revolving Credit Agreement. Obligations under the Revolving Credit Agreement are guaranteed by NuStar Energy and NuPOP. The Revolving Credit Agreement provides for U.S. dollar borrowings, which bear interest, at our option, based on an alternative base rate or a SOFR-based rate. The Revolving Credit Agreement and certain fees under the Receivables Financing Agreement, defined below, are the only debt arrangements with interest rates that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of June 30, 2023, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 7.7%.

The Revolving Credit Agreement is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount that is less than the total amount available for borrowing. For a rolling period of four quarters, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may not exceed 5.00-to-1.00, and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. As of June 30, 2023, we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

11

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC, a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $100.0 million receivables financing agreement with a third-party lender (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). Under the Securitization Program, certain of NuStar Energy’s wholly owned subsidiaries sell their accounts receivable to NuStar Finance on an ongoing basis, and NuStar Finance provides the newly acquired accounts receivable as collateral for its revolving borrowings under the Receivables Financing Agreement. On June 29, 2023, we amended the Receivables Financing Agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. As of June 30, 2023, the amount of borrowings outstanding under the Receivables Financing Agreement totaled $71.2 million, the interest rate related to outstanding borrowings was 6.7% and $108.2 million of our accounts receivable was included in the Securitization Program.

Fair Value of Long-Term Debt

The estimated fair values and carrying amounts of long-term debt, excluding finance leases, were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Fair value	$	3,250,699	$	3,169,664
Carrying amount	$	3,260,205	$	3,242,289

We have estimated the fair value of our publicly traded notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded notes falls in Level 1 of the fair value hierarchy. With regard to our other debt, for which a quoted market price is not available, we have estimated the fair value using a discounted cash flow analysis using current incremental borrowing rates for similar types of borrowing arrangements and determined that the fair value falls in Level 2 of the fair value hierarchy. The carrying amount includes unamortized debt issuance costs.

5. COMMITMENTS AND CONTINGENCIES

We have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $1.3 million and $0.3 million for contingent losses as of June 30, 2023 and December 31, 2022, respectively. The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

6. SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

Partial Redemptions

On May 25, 2023 and June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem a portion of our outstanding Series D Preferred Units. The redemptions closed on June 30, 2023 and July 31, 2023, respectively, and were primarily funded with borrowings under our Revolving Credit Agreement, which had been partially paid down in the first quarter of 2023 with proceeds from the Sale-Leaseback Transaction. On the respective notification dates, those Series D Preferred Units became mandatorily redeemable; therefore, we reclassified those Series D Preferred Units from mezzanine equity to liability-classified “Mandatorily redeemable Series D preferred units” valued at the redemption price, excluding accrued distributions (Net Redemption Price). As of June 30, 2023, we presented the liability-classified Series D Preferred Units as non-current on our balance sheet as we had the intent and ability to refinance them on a long-term basis using our Revolving Credit Agreement. We recorded the difference between the carrying value of those Series D Preferred Units prior to reclassification and the Net Redemption Price as a deemed distribution, which reduced our common equity and reduced net income attributable to common units in the calculation of basic and diluted net income (loss) per common unit. At each closing, we accounted for the redemptions as extinguishments of debt. Distributions accrued for redeemed units from the notification dates to the redemption dates totaled $1.7 million for the three and six months ended June 30, 2023, and are reported in “Interest expense, net” on the condensed consolidated statements of comprehensive income.

12

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Information related to the redemptions is shown below (thousands of dollars, except date, unit and per unit data):

	June 30, 2023 Redemption		July 31, 2023 Redemption
Notification date	May 25, 2023		June 29, 2023
Units redeemed	5,500,000		2,560,000
Redemption price per unit, including accrued distributions	$	31.88	$	32.18
Redemption price, including accrued distributions	$	175,340	$	82,381
Accrued distributions	825		1,152
Net Redemption Price	$	174,515	$	81,229
Carrying value of units at notification date	$	152,467	$	71,210
Net Redemption Price	174,515		81,229
Loss to common limited partners attributable to redemption	$	(22,048)	$	(10,019)
Loss per common limited partner unit attributable to redemption	$	(0.20)	$	(0.09)

Distributions

We allocate net income to our Series D Preferred Units equal to the amount of distributions earned during the period. Distributions on the Series D Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates and are payable on the 15th day (or next business day) of each of March, June, September and December, beginning September 17, 2018, to holders of record on the first business day of each payment month. The distribution rates on the Series D Preferred Units are as follows: (i) 9.75% per annum ($0.619 per unit per distribution period) for the first two years; (ii) 10.75% per annum ($0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter. While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. Any Series D Preferred Unit distributions in excess of $0.635 per unit may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash.

The distribution rate on our Series D Preferred Units increased on June 15, 2023, to the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit. Total distribution excludes amounts reported in “Interest expense, net” as described above under “Partial Redemptions of Series D Preferred Units.” Distribution information on our Series D Preferred Units is as follows:

Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148
June 15, 2022 - September 14, 2022	$	0.682	$	15,854
March 15, 2022 - June 14, 2022	$	0.682	$	15,854
December 15, 2021 - March 14, 2022	$	0.682	$	15,854

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

In July 2023, our board of directors declared distributions with respect to the Series D Preferred Units to be paid on September 15, 2023.

13

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Units Issued and Outstanding

The following is a summary of our Series D Preferred Units issued and outstanding:

	Transaction Date	Price per Unit	Number of Units
Issuance	June 29, 2018	$25.38	15,760,441
Issuance	July 13, 2018	$25.38	7,486,209
Total units issued			23,246,650
Repurchase	November 22, 2022	$32.73	(6,900,000)
Units outstanding as of December 31, 2022			16,346,650
Redemption	June 30, 2023	$31.88	(5,500,000)
Units outstanding as of June 30, 2023			10,846,650

As of June 30, 2023, we reported 2,560,000 of the Series D Preferred Units outstanding in “Mandatorily redeemable Series D preferred units” and 8,286,650 Series D Preferred Units in “Mezzanine Equity” on the consolidated balance sheets. After the July 31, 2023 redemption, 8,286,650 Series D Preferred Units remain outstanding.

7. PARTNERS' EQUITY

Series A, B and C Preferred Units

We allocate net income to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units) equal to the amount of distributions earned during the period. Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month.

Information on our Series A, B and C Preferred Units is shown below:

Units	Units Issued and Outstanding as of June 30, 2023	Optional Redemption Date/Date When Distribution Rate Became Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	9,060,000	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	15,400,000	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	6,900,000	December 15, 2022	Three-month LIBOR plus 6.88%

Distribution information on our Series A, B and C Preferred Units is as follows:

	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)
June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010
June 15, 2022 - September 14, 2022	$	0.54808	$	4,966	$	0.47789	$	7,360	$	0.56250	$	3,881
March 15, 2022 - June 14, 2022	$	0.47817	$	4,332	$	0.47657	$	7,339	$	0.56250	$	3,881
December 15, 2021 - March 14, 2022	$	0.43606	$	3,951	$	0.47657	$	7,339	$	0.56250	$	3,881

(a) Total distributions are estimated based on the number of units outstanding as of June 30, 2023.

In July 2023, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on September 15, 2023.

Common Limited Partners

We make quarterly distributions to common unitholders of 100% of our “Available Cash,” generally defined as cash receipts less cash disbursements, including distributions to our preferred units, and cash reserves established by the general partner, in

14

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

its sole discretion. These quarterly distributions are declared and paid within 45 days subsequent to each quarter-end. The common unitholders receive a distribution each quarter as determined by the board of directors, subject to limitation by the distributions in arrears, if any, on our preferred units. In July 2023, our board of directors declared distributions with respect to our common units for the quarter ended June 30, 2023.

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

Accumulated Other Comprehensive Income (Loss) (AOCI)

The balance of and changes in the components included in AOCI were as follows:

	Three Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of April 1	$	497	$	(33,865)	$	1,967	$	(31,401)	$	(40,932)	$	(35,957)	$	3,843	$	(73,046)
Other comprehensive income before reclassification adjustments	249		—		—		249		1,133		—		—		1,133
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(736)		(736)		—		—		(420)		(420)
Net loss on cash flow hedges reclassified into interest expense, net	—		505		—		505		—		521		—		521
Other	—		—		(10)		(10)		—		—		(6)		(6)
Other comprehensive income (loss)	249		505		(746)		8		40,779		521		(426)		40,874
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

15

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

	Six Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1	$	62	$	(34,380)	$	2,713	$	(31,605)	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)
Other comprehensive income before reclassification adjustments	684		—		—		684		1,962		—		—		1,962
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(1,473)		(1,473)		—		—		(840)		(840)
Net loss on cash flow hedges reclassified into interest expense, net	—		1,020		—		1,020		—		1,050		—		1,050
Other	—		—		(19)		(19)		—		—		(12)		(12)
Other comprehensive income (loss)	684		1,020		(1,492)		212		41,608		1,050		(852)		41,806
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

As of June 30, 2023, we expect to reclassify a loss of $3.3 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

8. NET INCOME (LOSS) PER COMMON UNIT

Basic and diluted net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans and, beginning on June 15, 2023, the Series D Preferred Units. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to common units by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit by dividing net income (loss) attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units include the Series D Preferred Units.

The Series D Preferred Units contain certain unitholder conversion and redemption features, and we use the if-converted method to calculate the dilutive effect of the conversion or redemption feature that is most advantageous to our Series D preferred unitholders. The effect of the assumed conversion or redemption of the Series D Preferred Units outstanding was antidilutive for each of the three and six months ended June 30, 2023 and 2022; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

16

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

The following table details the calculation of basic and diluted net (loss) income per common unit:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Distributions to preferred limited partners	(32,126)		(31,523)		(64,859)		(62,615)
Distributions to common limited partners	(44,363)		(44,128)		(88,759)		(88,293)
Distribution equivalent rights to restricted units	(667)		(617)		(1,339)		(1,250)
Distributions in excess of income	$	(31,015)	$	(17,069)	$	(2,880)	$	(80,647)
Distributions to common limited partners	$	44,363	$	44,128	$	88,759	$	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)		(17,069)		(2,880)		(80,647)
Series D Preferred Unit accretion	(3,303)		(4,734)		(6,974)		(9,315)
Series D Preferred Unit redemption	(32,067)		—		(32,067)		—
Net (loss) income attributable to common units	$	(22,022)	$	22,325	$	46,838	$	(1,669)
Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201
Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	0.42	$	(0.02)

9. SUPPLEMENTAL CASH FLOW INFORMATION

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	12,356	$	(21,262)
Inventories	4,920		1,439
Other current assets	(3,508)		705
Increase (decrease) in current liabilities:
Accounts payable	(2,427)		5,082
Accrued interest payable	869		567
Accrued liabilities	(8,300)		(14,448)
Taxes other than income tax	(2,125)		(3,023)
Changes in current assets and current liabilities	$	1,785	$	(30,940)

The above changes in current assets and current liabilities may differ from changes between amounts reflected in the applicable consolidated balance sheets due to:

•the change in the amount accrued for capital expenditures;

•the effect of accrued compensation expense paid with fully vested common unit awards; and

•current assets and current liabilities disposed of during the period.

17

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Other supplemental cash flow information is as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	110,195	$	95,112
Cash paid for income taxes, net of tax refunds received	$	2,842	$	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	$	82,372	$	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$	1,818	$	1,342

Restricted cash, representing legally restricted funds that are unavailable for general use, is included in "Other long-term assets, net" on the consolidated balance sheets. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows is included in the consolidated balance sheets as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Cash and cash equivalents	$	3,813	$	14,489
Other long-term assets, net	9,056		8,888
Cash, cash equivalents and restricted cash	$	12,869	$	23,377

10. SEGMENT INFORMATION

Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level.

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Revenues:
Pipeline	$	206,701	$	200,565	$	419,884	$	389,248
Storage	78,209		88,783		158,866		176,704
Fuels marketing	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020
Operating income:
Pipeline	$	107,804	$	100,953	$	227,662	$	196,705
Storage	21,213		31,207		43,979		16,232
Fuels marketing	6,510		6,631		13,076		13,175
Total segment operating income	135,527		138,791		284,717		226,112
Gain on sale of assets	—		—		41,075		—
General and administrative expenses	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total operating income	$	102,870	$	109,059	$	262,855	$	167,485

18

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Total assets by reportable segment were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Pipeline	$	3,304,918	$	3,360,685
Storage	1,410,647		1,438,609
Fuels marketing	29,045		37,763
Total segment assets	4,744,610		4,837,057
Other partnership assets	145,805		136,629
Total consolidated assets	$	4,890,415	$	4,973,686

19

Table of Contents

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

Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

In this Form 10-Q, we make certain forward-looking statements, such as statements regarding our plans, strategies, objectives, expectations, estimates, predictions, projections, assumptions, intentions, resources and the future impact of economic activity and the actions by oil-producing nations on our business. While these forward-looking statements, and any assumptions upon which they are based, are made in good faith and reflect our current judgment regarding the direction of our business, actual results will almost always vary, sometimes materially, from any estimates, predictions, projections, assumptions or other future performance suggested in this report. These forward-looking statements can generally be identified by the words “anticipates,” “believes,” “expects,” “plans,” “intends,” “estimates,” “forecasts,” “budgets,” “projects,” “will,” “could,” “should,” “may” and similar expressions. These statements reflect our current views with regard to future events and are subject to various risks, uncertainties and assumptions, which may cause actual results to differ materially. Please read Item 1A. “Risk Factors” contained in our Annual Report on Form 10-K for the year ended December 31, 2022, as well as additional information provided from time to time in our subsequent filings with the Securities and Exchange Commission, for a discussion of certain of those risks, uncertainties and assumptions.

If one or more of these risks or uncertainties materialize, or if the underlying assumptions prove incorrect, our actual results may vary materially from those described in any forward-looking statement. Other unknown or unpredictable factors could also have material adverse effects on our future results. Readers are cautioned not to place undue reliance on this forward-looking information, which is as of the date of this Form 10-Q. We do not intend to update these statements unless we are required by the securities laws to do so, and we undertake no obligation to publicly release the result of any revisions to any such forward-looking statements that may be made to reflect events or circumstances after the date of this report or to reflect the occurrence of unanticipated events.

Our Management’s Discussion and Analysis of Financial Condition and Results of Operations is presented in four sections:

•Overview, including Trends and Outlook

•Results of Operations

•Liquidity and Capital Resources

•Critical Accounting Policies

OVERVIEW

NuStar Energy L.P. (NYSE: NS) is primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. We also market petroleum products. Our business is managed under the direction of the board of directors of NuStar GP, LLC, the general partner of our general partner, Riverwalk Logistics, L.P., both of which are wholly owned subsidiaries of ours.

Our operations consist of three reportable business segments: pipeline, storage and fuels marketing. As of June 30, 2023, our assets included 9,475 miles of pipeline and 63 terminal and storage facilities, which provided approximately 49 million barrels of storage capacity. We conduct our operations through our wholly owned subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). The term “throughput” as used in this document generally refers to barrels of crude oil, refined product or renewable fuels or tons of ammonia, as applicable, that pass through our pipelines, terminals or storage tanks. We generate revenue primarily from:

•tariffs for transportation through our pipelines;

•fees for the use of our terminal and storage facilities and related ancillary services; and

•sales of petroleum products.

The following factors affect the results of our operations:

•economic factors and price volatility;

•industry factors, such as changes in the prices of petroleum products that affect demand or production, or regulatory changes that could increase costs or impose restrictions on operations;

•factors that affect our customers and the markets they serve, such as utilization rates and maintenance turnaround schedules of our refining company customers and drilling activity by our crude oil production customers;

20

Table of Contents

•company-specific factors, such as facility integrity issues, maintenance requirements and outages that impact the throughput rates of our assets; and

•seasonal factors that affect the demand for products transported by and/or stored in our assets and the demand for products we sell.

Recent Developments

Partial Redemptions of Series D Preferred Units. On June 30, 2023, we redeemed an aggregate 5,500,000 of our Series D Cumulative Convertible Preferred Units (Series D Preferred Units), at a price per unit of $31.88, for an aggregate purchase price of $175.3 million. On June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem an aggregate 2,560,000 of our Series D Preferred Units, at a price per unit of $32.18 for an aggregate purchase price of $82.4 million. This redemption closed on July 31, 2023. The redemptions in June and July were primarily funded with borrowings under our $1.0 billion unsecured revolving credit agreement. For the three and six months ended June 30, 2023, we recorded an aggregate $0.29 loss per common unit attributable to the redemptions. Please see Note 6 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for additional information on these transactions.

Debt Amendments. On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement, mainly to extend the maturity date from April 27, 2025 to January 27, 2027. On June 29, 2023, we amended our $100.0 million receivables financing agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. Please refer to Note 4 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for more information.

Sale-leaseback Transaction. On March 21, 2023, we consummated a sale-leaseback transaction with respect to our corporate headquarters facility and approximately 24 acres of underlying land located in San Antonio, Texas (the Corporate Headquarters) for approximately $103.0 million and recognized a gain of $41.1 million. We entered into the sale-leaseback transaction in order to monetize the Corporate Headquarters and used the proceeds to repay borrowings on our revolving credit agreement. Please refer to Note 2 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for additional information.

Other Event

Point Tupper Terminal Disposition. On April 29, 2022, we sold the equity interests in our wholly owned subsidiaries that owned our Point Tupper terminal facility in Nova Scotia, Canada (the Point Tupper Terminal Operations) to EverWind Fuels for $60.0 million (the Point Tupper Terminal Disposition). The terminal facility had a storage capacity of 7.8 million barrels and was included in the storage segment. We recognized a non-cash, pre-tax impairment loss of $46.1 million in the first quarter of 2022 and a non-cash gain on the sale of $1.6 million in the second quarter of 2022. Please refer to Note 2 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for additional information.

Trends and Outlook

In 2023, we are continuing to execute our plan to strengthen our balance sheet, and in the first quarter of 2023, we completed the sale-leaseback of our Corporate Headquarters for about $103.0 million of cash, as described above. We deployed the proceeds to reduce our debt balance, which facilitated our redemption of a portion of our Series D Preferred Units in June and July 2023, as described above. For the full-year 2023, we expect to fund all of our expenses, distribution requirements and capital expenditures using internally generated cash flows, as we did in 2022 and 2021. We will continue to evaluate sources of liquidity to facilitate the planned redemption of the remaining Series D Preferred Units, which we expect to complete several years ahead of the holders’ redemption option in 2028. We plan to continue to manage our operations with fiscal discipline in order to best maximize unitholder value.

For the remainder of 2023, we expect most of our pipeline systems to benefit from the positive revenue impacts of our tariff indexation increases effective in July 2022 and July 2023, which is an important counterbalance to the impact of inflation on our business.

While many terminals in our storage segment are somewhat insulated from demand volatility due to contracted rates for storage, index rate adjustments and minimum volume commitments, revenues at our St. James and Corpus Christi North Beach facilities continue to be negatively impacted by ongoing global economic uncertainty and continued crude oil price backwardation. Conversely, we expect our West Coast region to continue to benefit in 2023 from the completion of renewable fuel projects, which continue to expand the capacity of our renewable fuels distribution system and further solidify the significant role NuStar plays in facilitating California’s transition to low-carbon renewable fuels.

21

Table of Contents

Economic metrics thus far in 2023 have indicated a slowing in inflationary pressures that were prevalent in 2021 and 2022. However, the current mix of uncertain market conditions, rising interest rates, supply chain disruptions and tight labor markets could cause us to see higher costs of operating our assets and executing on our capital projects in 2023. In an effort to curb inflation, the U.S. Federal Reserve (the Fed) raised interest rates in 2022 and continued to do so in 2023. The Fed may implement additional increases in 2023, which will increase the cost of our variable-rate debt, as well as the cost of our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units, which have distribution rates that increase or decrease along with current interest rates. On the other hand, our ability to pass along rate increases reflecting changes in producer and/or consumer price indices to our customers, under our tariffs and contracts, should help to counterbalance the impact of inflation on our costs. Additionally, we expect to further mitigate the impact of inflation in 2023 through our expense optimization initiative we began in early 2022.

Our outlook for the partnership, both overall and for any of our segments, may change, as we base our expectations on our continuing evaluation of several factors, many of which are outside our control. These factors include, but are not limited to, the state of the economy and the capital markets; the impact of health crises; war and other armed conflicts; changes to our customers’ refinery maintenance schedules and unplanned refinery downtime; actions of oil-producing nations; crude oil prices; the supply of and demand for petroleum products, renewable fuels and anhydrous ammonia; demand for our transportation and storage services; the availability and costs of personnel, equipment, supplies and services essential to our operations; the ability to obtain timely permitting approvals; and changes in laws and regulations affecting our operations.

22

Table of Contents

RESULTS OF OPERATIONS

Consolidated Results of Operations

Three Months Ended June 30, 2023 Compared to Three Months Ended June 30, 2022

	Three Months Ended June 30,				Change
	2023		2022
	(Unaudited, Thousands of Dollars, Except Per Unit Data)
Statement of Income Data:
Revenues:
Service revenues	$	275,367	$	278,067	$	(2,700)
Product sales	102,967		152,090		(49,123)
Total revenues	378,334		430,157		(51,823)
Costs and expenses:
Costs associated with service revenues	155,893		157,188		(1,295)
Costs associated with product sales	86,914		134,178		(47,264)
General and administrative expenses	31,620		27,909		3,711
Other depreciation and amortization expense	1,037		1,823		(786)
Total costs and expenses	275,464		321,098		(45,634)
Operating income	102,870		109,059		(6,189)
Interest expense, net	(58,170)		(50,941)		(7,229)
Other income, net	2,633		2,012		621
Income before income tax expense	47,333		60,130		(12,797)
Income tax expense	1,192		931		261
Net income	$	46,141	$	59,199	$	(13,058)
Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	(0.40)

Consolidated Overview

Net income decreased $13.1 million for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, mainly due to lower operating income of $6.2 million and higher interest expense of $7.2 million. Operating income declined primarily due to lower operating income from our storage segment and higher general and administrative expenses, partially offset by higher operating income from our pipeline segment, as further discussed below.

General and administrative expenses increased $3.7 million for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, mainly due to an increase in rent expense of $2.0 million related to the Corporate Headquarters following the sale-leaseback transaction in the first quarter of 2023 and higher compensation expenses.

Interest expense, net, increased $7.2 million for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, primarily due to higher interest rates on our variable-rate debt in 2023.

Basic and diluted net (loss) income per common unit: In the second quarter of 2023, we notified the holders of our Series D Preferred Units of our intent to redeem a portion of the Series D Preferred Units outstanding, and we recognized an aggregate loss of $0.29 per common unit for the three months ended June 30, 2023, related to these redemptions. Please see Notes 6 and 8 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for additional information.

23

Table of Contents

Six Months Ended June 30, 2023 Compared to Six Months Ended June 30, 2022

	Six Months Ended June 30,				Change
	2023		2022
	(Unaudited, Thousands of Dollars, Except Per Unit Data)
Statement of Income Data:
Revenues:
Service revenues	$	560,633	$	543,372	$	17,261
Product sales	211,568		296,648		(85,080)
Total revenues	772,201		840,020		(67,819)
Costs and expenses:
Costs associated with service revenues	307,109		306,893		216
Cost associated with product sales	180,375		260,893		(80,518)
Impairment loss	—		46,122		(46,122)
General and administrative expenses	60,345		54,980		5,365
Other depreciation and amortization expense	2,592		3,647		(1,055)
Total costs and expenses	550,421		672,535		(122,114)
Gain on sale of assets	41,075		—		41,075
Operating income	262,855		167,485		95,370
Interest expense, net	(115,541)		(100,759)		(14,782)
Other income, net	7,142		5,683		1,459
Income before income tax expense	154,456		72,409		82,047
Income tax expense	2,379		898		1,481
Net income	$	152,077	$	71,511	$	80,566
Basic and diluted net income (loss) per common unit	$	0.42	$	(0.02)	$	0.44

Consolidated Overview

Net income increased $80.6 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to higher operating income of $95.4 million, partially offset by an increase in interest expense, net of $14.8 million. Operating income increased primarily due to a gain of $41.1 million related to the sale-leaseback transaction of the Corporate Headquarters in the first quarter of 2023, a non-cash, pre-tax impairment loss of $46.1 million in the first quarter of 2022 and higher operating income from our pipeline segment in the first half of 2023, partially offset by lower revenues from our storage segment in the first half of 2023.

General and administrative expenses increased $5.4 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to an increase in rent expense of $2.2 million related to the Corporate Headquarters following the sale-leaseback transaction in the first quarter of 2023 and higher compensation expenses.

Interest expense, net, increased $14.8 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, primarily due to higher interest rates on our variable-rate debt in 2023.

Basic and diluted net income (loss) per common unit: In the second quarter of 2023, we notified the holders of our Series D Preferred Units of our intent to redeem a portion of the Series D Preferred Units outstanding, and we recognized an aggregate loss of $0.29 per common unit for the six months ended June 30, 2023, related to these redemptions. Please see Notes 6 and 8 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for additional information.

24

Table of Contents

Pipeline Segment

As of June 30, 2023, our pipeline assets consist of 9,475 miles of pipeline with 33 terminals and 13.0 million barrels of storage capacity. Our Central West System includes 2,915 miles of refined product pipelines and 2,065 miles of crude oil pipelines. In addition, our Central East System includes 2,495 miles of refined product pipelines, consisting of the East and North Pipelines, and an approximately 2,000-mile ammonia pipeline (the Ammonia Pipeline). We charge tariffs on a per barrel basis for transportation in our refined product and crude oil pipelines and on a per ton basis for transportation in the Ammonia Pipeline. Throughputs on the Ammonia Pipeline are converted from tons to barrels for reporting purposes only. Other revenues include product sales of surplus pipeline loss allowance (PLA) volumes.

Three Months Ended June 30, 2023 Compared to Three Months Ended June 30, 2022

	Three Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars, Except Barrels/Day Information)
Pipeline Segment:
Crude oil pipelines throughput (barrels/day)	1,111,120		1,220,758		(109,638)
Refined products and ammonia pipelines throughput (barrels/day)	597,162		582,182		14,980
Total throughput (barrels/day)	1,708,282		1,802,940		(94,658)
Throughput and other revenues	$	206,701	$	200,565	$	6,136
Operating expenses	55,042		55,170		(128)
Depreciation and amortization expense	43,855		44,442		(587)
Segment operating income	$	107,804	$	100,953	$	6,851

Pipeline segment revenues increased $6.1 million, despite a decrease in throughputs of 94,658 barrels per day for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, mainly due to the following:

•an increase in revenues of $7.0 million and an increase in throughputs of 40,617 barrels per day on our McKee System pipelines, primarily due to operational issues at a customer’s refinery in 2022, as well as higher demand on most of our pipelines in the second quarter of 2023;

•an increase in revenues of $1.3 million, despite comparable throughputs on our Valley Pipeline, due to the timing of recognizing minimum volume commitment settlements with customers and the tariff indexation increases effective in July 2022;

•an increase in revenues of $1.1 million, despite comparable throughputs on our Ammonia Pipeline, due to the tariff indexation increases effective in July 2022;

•throughputs decreased 20,474 barrels per day on our Permian Crude System, due to decreased customer production supplying this system, while revenues remained comparable due to the tariff indexation increases effective in July 2022;

•a decrease in revenues of $1.9 million and a decrease in throughputs of 45,446 barrels per day on the Ardmore System, due to a turnaround at a customer’s refinery in the second quarter of 2023; and

•a decrease in revenues of $1.5 million and a decrease in throughputs of 62,444 barrels per day on our Corpus Christi Crude Pipeline System, mainly due to unfavorable market conditions and reductions in minimum volume commitments, while increased volumes on certain pipelines in this system in the second quarter of 2023 partially offset the overall decreases.

25

Table of Contents

Six Months Ended June 30, 2023 Compared to Six Months Ended June 30, 2022

	Six Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars, Except Barrels/Day Information)
Pipeline Segment:
Crude oil pipelines throughput (barrels/day)	1,217,610		1,264,678		(47,068)
Refined products and ammonia pipelines throughput (barrels/day)	596,396		572,767		23,629
Total throughput (barrels/day)	1,814,006		1,837,445		(23,439)
Throughput and other revenues	$	419,884	$	389,248	$	30,636
Operating expenses	104,817		103,273		1,544
Depreciation and amortization expense	87,405		89,270		(1,865)
Segment operating income	$	227,662	$	196,705	$	30,957

Pipeline segment revenues increased $30.6 million, despite a decrease in throughputs of 23,439 barrels per day for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to the following:

•an increase in revenues of $13.8 million and an increase in throughputs of 43,657 barrels per day on our McKee System pipelines, primarily due to operational issues at a customer’s refinery in 2022, as well as higher demand on our pipeline serving the Denver, Colorado market in 2023;

•an increase in revenues of $7.2 million, despite comparable throughputs on our Central East System, mainly due to the tariff indexation increases effective in July 2022;

•an increase in revenues of $7.1 million, despite comparable throughputs on our Permian Crude System, mainly due to more barrels moved at higher average tariffs in the first half of 2023 and the tariff indexation increases effective in July 2022; these increases were partially offset by a decrease of $2.9 million due to lower commodity prices on PLA volumes sold;

•an increase in revenues of $2.9 million and an increase in throughputs of 1,953 barrels per day on our Valley Pipeline, due to higher demand in the markets served by this pipeline in 2023, the timing of recognizing minimum volume commitment settlements with customers and the tariff indexation increases effective in July 2022;

•an increase in revenues of $2.1 million and an increase in throughputs of 1,312 barrels per day on our Three Rivers System, mainly due to pipeline expansions that were placed in service in July 2022;

•a decrease in revenues of $2.7 million and a decrease in throughputs of 22,388 barrels per day on the Ardmore System due to a turnaround at a customer’s refinery in the second quarter of 2023; and

•a decrease in throughputs of 45,944 barrels per day on our Corpus Christi Crude Pipeline System, mainly due to unfavorable market conditions and reductions in minimum volume commitments, while increased volumes on certain pipelines in this system in the first half of 2023 kept revenues comparable to the same period last year.

Depreciation and amortization expense decreased $1.9 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to more fully depreciated assets.

Storage Segment

Our storage segment is composed of our facilities that provide storage, handling and other services for refined products, crude oil, specialty chemicals, renewable fuels and other liquids. As of June 30, 2023, we owned and operated 29 terminal and storage facilities in the U.S. and one terminal in Nuevo Laredo, Mexico, with an aggregate storage capacity of 36.4 million barrels. Revenues for the storage segment include fees for tank storage agreements, under which a customer agrees to pay for a certain amount of storage in a tank over a period of time (storage terminal revenues), and throughput agreements, under which a customer pays a fee per barrel for volumes moved through our terminals (throughput terminal revenues).

Point Tupper Terminal Disposition. In the first quarter of 2022, we recorded a non-cash, pre-tax impairment loss of $46.1 million related to our Point Tupper Terminal Operations, which were sold on April 29, 2022.

26

Table of Contents

Three Months Ended June 30, 2023 Compared to Three Months Ended June 30, 2022

	Three Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars, Except Barrels/Day Information)
Storage Segment:
Throughput (barrels/day) (a)	391,495		446,057		(54,562)
Throughput terminal revenues	$	23,839	$	30,929	$	(7,090)
Storage terminal revenues	54,370		57,854		(3,484)
Total revenues	78,209		88,783		(10,574)
Operating expenses	38,321		39,778		(1,457)
Depreciation and amortization expense	18,675		17,798		877
Segment operating income	$	21,213	$	31,207	$	(9,994)

(a)Prior period throughputs for our Corpus Christi North Beach terminal were restated consistent with current period presentation.

Throughput terminal revenues decreased $7.1 million and throughputs decreased 54,562 barrels per day for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, mainly due to a decrease in revenues of $9.0 million and a decrease in throughputs of 68,431 barrels per day at our Corpus Christi North Beach terminal, due to unfavorable market conditions and reductions in minimum volume commitments. The overall decrease was partially offset by an increase in revenues of $1.9 million and an increase in throughputs of 13,869 barrels per day on our Central West Terminals due to higher demand in the second quarter of 2023.

Storage terminal revenues decreased $3.5 million for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, primarily due to:

•a decrease in revenues of $10.3 million at our St. James terminal due to customers not renewing expiring contracts in the current backwardated market; and

•a decrease in revenues of $1.8 million due to the Point Tupper Terminal Disposition in April 2022.

These decreases were partially offset by an increase in revenues of $7.5 million at our West Coast Terminals, primarily due to new contracts, rate escalations and higher throughput and handling fees.

Operating expenses decreased $1.5 million for the three months ended June 30, 2023, compared to the three months ended June 30, 2022, primarily due to a decrease in operating expenses of $1.8 million due to the Point Tupper Terminal Disposition in April 2022.

Six Months Ended June 30, 2023 Compared to Six Months Ended June 30, 2022

	Six Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars, Except Barrels/Day Information)
Storage Segment:
Throughput (barrels/day) (a)	446,798		464,191		(17,393)
Throughput terminal revenues	$	51,154	$	57,370	$	(6,216)
Storage terminal revenues	107,712		119,334		(11,622)
Total revenues	158,866		176,704		(17,838)
Operating expenses	77,708		78,077		(369)
Depreciation and amortization expense	37,179		36,273		906
Impairment loss	—		46,122		(46,122)
Segment operating income	$	43,979	$	16,232	$	27,747

(a)Prior period throughputs for our Corpus Christi North Beach terminal were restated consistent with current period presentation.

Throughput terminal revenues decreased $6.2 million and throughputs decreased 17,393 barrels per day for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, primarily due to a decrease in revenues of $9.6 million

27

Table of Contents

and a decrease in throughputs of 33,039 barrels per day at our Corpus Christi North Beach terminal, mainly due to unfavorable market conditions and reductions in minimum volume commitments. These decreases were partially offset by an increase in revenues of $3.4 million and an increase in throughputs of 15,646 barrels per day at our Central West Terminals, primarily due to higher demand in the first half of 2023 and operating issues at a customer’s refinery in 2022.

Storage terminal revenues decreased $11.6 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, primarily due to the following:

•a decrease in revenues of $20.0 million at our St. James terminal due to customers not renewing expiring contracts in the current backwardated market; and

•a decrease in revenues of $9.6 million due to the Point Tupper Terminal Disposition in April 2022.

These decreases were partially offset by the following:

•an increase in revenues of $15.8 million at our West Coast Terminals, primarily due to new contracts, rate escalations and higher throughput and handling fees; and

•an increase in revenues of $1.1 million due to rate escalations on our refinery storage tanks.

Operating expenses decreased $0.4 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, primarily due to an aggregate decrease in operating expenses of $7.9 million due to the Point Tupper Terminal Disposition in April 2022, mostly offset by increases in reimbursable expenses of $3.7 million and maintenance and regulatory expenses of $3.4 million, across various terminals.

Fuels Marketing Segment

The fuels marketing segment mainly includes our bunkering operations in the Gulf Coast, as well as certain of our blending operations associated with our Central East System. The results of operations for the fuels marketing segment depend largely on the margin between our costs and the sales prices of the products we market. Therefore, the results of operations for this segment are more sensitive to changes in commodity prices compared to the operations of the pipeline and storage segments. We enter into derivative contracts to attempt to mitigate the effects of commodity price fluctuations. The financial impacts of the derivative financial instruments associated with commodity price risk were not material for any periods presented.

Three Months Ended June 30, 2023 Compared to Three Months Ended June 30, 2022

	Three Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars)
Fuels Marketing Segment:
Product sales	$	93,426	$	140,809	$	(47,383)
Cost of goods	86,349		133,741		(47,392)
Gross margin	7,077		7,068		9
Operating expenses	567		437		130
Segment operating income	$	6,510	$	6,631	$	(121)

Segment operating income was comparable for the three months ended June 30, 2023 and the three months ended June 30, 2022. Higher blending gross margins of $2.1 million from lower fuel costs were offset by a decrease of $1.2 million in gross margins from our bunkering operations due to lower fuel prices and a decrease of $0.9 million in other product sales.

28

Table of Contents

Six Months Ended June 30, 2023 Compared to Six Months Ended June 30, 2022

	Six Months Ended June 30,				Change
	2023		2022
	(Thousands of Dollars)
Fuels Marketing Segment:
Product sales	$	193,453	$	274,069	$	(80,616)
Cost of goods	179,535		259,864		(80,329)
Gross margin	13,918		14,205		(287)
Operating expenses	842		1,030		(188)
Segment operating income	$	13,076	$	13,175	$	(99)

Segment operating income was comparable for the six months ended June 30, 2023 and the six months ended June 30, 2022. Higher blending gross margins of $3.8 million from lower fuel costs were offset by a decrease of $2.1 million in gross margins from our bunkering operations due to lower fuel prices and a decrease of $2.0 million in other product sales.

LIQUIDITY AND CAPITAL RESOURCES

OVERVIEW

Our primary cash requirements are for distributions to our partners, debt service, capital expenditures and operating expenses. Our partnership agreement requires that we distribute all “Available Cash” to our common limited partners each quarter. “Available Cash” is defined in the partnership agreement generally as cash on hand at the end of the quarter, plus certain permitted borrowings made subsequent to the end of the quarter, less cash reserves determined by our board of directors, subject to requirements for distributions for our preferred units. We may maintain our distribution level with other sources of Available Cash, as provided in our partnership agreement, including borrowings under our revolving credit agreement and proceeds from the sale of assets.

In 2022 and 2021, we were able to fund all of our expenses, distribution requirements and capital expenditures using internally generated cash flows. We reduced our leverage to position ourselves to repurchase 6,900,000 of our Series D Preferred Units in November 2022, representing approximately one-third of the outstanding units, using borrowings under our revolving credit agreement.

For the full-year 2023, we expect to fund all of our expenses, distribution requirements and capital expenditures using internally generated cash flows. In the first quarter of 2023, we completed the sale-leaseback of our Corporate Headquarters for approximately $103.0 million, which we used to repay borrowings on our revolving credit agreement. In the second quarter of 2023, we extended the maturity date on our $1.0 billion unsecured revolving credit agreement to January 27, 2027, and extended the scheduled termination date on our $100.0 million receivables financing agreement to July 1, 2026. In the second quarter of 2023, we also redeemed an aggregate 5,500,000 of our Series D Preferred Units, representing approximately one-third of the then outstanding units, and in July of 2023, we redeemed an aggregate 2,560,000 of our Series D Preferred Units. These redemptions were primarily funded with borrowings under our $1.0 billion unsecured revolving credit agreement, which had been partially paid down in the first quarter of 2023 with proceeds from the Sale-Leaseback Transaction.

Beginning in 2028, the holders of the Series D Preferred Units have the option to require us to redeem their units. We will continue to evaluate other sources of liquidity to facilitate the planned redemption of the remaining 8,286,650 outstanding Series D Preferred Units, representing approximately 36% of the original issuances.

We have no long-term debt maturities until 2025, and we expect to be able to access debt capital markets to refinance those maturities.

29

Table of Contents

CASH FLOWS FOR THE SIX MONTHS ENDED JUNE 30, 2023 AND 2022

The following table summarizes our cash flows from operating, investing and financing activities (please refer to our Consolidated Statements of Cash Flows in Item 1. “Financial Statements”):

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Net cash provided by (used in):
Operating activities	$	252,305	$	222,287
Investing activities	62,082		(14,805)
Financing activities	(325,205)		(209,539)
Effect of foreign exchange rate changes on cash	310		763
Net decrease in cash, cash equivalents and restricted cash	$	(10,508)	$	(1,294)

Net cash provided by operating activities increased $30.0 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to changes in working capital. Generally, working capital requirements are affected by our accounts receivable, accounts payable and accrued liabilities balances, which vary depending on the timing of payments. Our working capital decreased $1.8 million for the six months ended June 30, 2023, compared to an increase of $30.9 million for the six months ended June 30, 2022, mainly due to changes in accounts receivable due to timing of payments and receipt of insurance proceeds.

For the six months ended June 30, 2023, we recorded net cash provided by investing activities of $62.1 million, compared to net cash used in investing activities of $14.8 million for the six months ended June 30, 2022, primarily due to proceeds of approximately $103.0 million from the sale of the Corporate Headquarters in the first quarter of 2023 compared to proceeds from asset sales of $59.5 million in the second quarter of 2022. Additionally, for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, capital expenditures decreased $16.9 million and we received $6.6 million more in insurance proceeds.

Net cash used in financing activities increased $115.7 million for the six months ended June 30, 2023, compared to the six months ended June 30, 2022, mainly due to the partial redemption of Series D Preferred Units for $174.5 million in June 2023. The overall increase was partially offset by net debt borrowings of $15.3 million for the six months ended June 30, 2023, compared to net debt repayments of $47.7 million for the six months ended June 30, 2022.

SOURCES OF LIQUIDITY

Revolving Credit Agreement

On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement (the Revolving Credit Agreement), mainly to extend the maturity date from April 27, 2025 to January 27, 2027. The amendment also includes a requirement that we certify that the sum of our Revolving Credit Agreement availability and unrestricted cash balance is no less than $150.0 million on a pro forma basis prior to using any borrowings under the Revolving Credit Agreement to redeem certain unsecured indebtedness or our Series D Preferred Units.

The Revolving Credit Agreement is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount that is less than the total amount available for borrowing. For a rolling period of four quarters, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may not exceed 5.00-to-1.00, and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. As of June 30, 2023, our consolidated debt coverage ratio was 3.73x and our consolidated interest coverage ratio was 2.20x. As of June 30, 2023, we had $750.4 million available for borrowing. Letters of credit issued under the Revolving Credit Agreement totaled $4.6 million as of June 30, 2023 and limit the amount we can borrow under the Revolving Credit Agreement. Borrowings under the Revolving Credit Agreement bear interest, at our option, at an alternate base rate or a SOFR rate, each as defined in the Revolving Credit Agreement.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $100.0 million receivables financing agreement with a third-party lender (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries. On June 29, 2023, we amended the Receivables Financing Agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. As of June 30, 2023, $108.2 million of our accounts receivable was included in the Securitization Program and the amount of

30

Table of Contents

borrowings outstanding under the Receivables Financing Agreement totaled $71.2 million. The amount available for borrowing under the Receivables Financing Agreement is based on the availability of eligible receivables and other customary factors and conditions. Borrowings under the Receivables Financing Agreement bear interest, at NuStar Finance’s option, at a base rate or a SOFR rate, each as defined in the Receivables Financing Agreement.

The interest rate on the Revolving Credit Agreement and certain fees under the Receivables Financing Agreement are the only debt arrangements that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. Please refer to Note 4 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further discussion of certain of our debt agreements.

Asset Sales

We used the proceeds from the sale of our Corporate Headquarters on March 21, 2023 and from the Point Tupper Terminal Disposition on April 29, 2022 to repay outstanding borrowings under our Revolving Credit Agreement. Please refer to Note 2 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further discussion of these dispositions.

MATERIAL CASH REQUIREMENTS

Capital Expenditures

Our operations require significant investments to maintain, upgrade or enhance the operating capacity of our existing assets. Our capital expenditures consist of:

•strategic capital expenditures, such as those to expand or upgrade the operating capacity, increase efficiency or increase the earnings potential of existing assets, whether through construction or acquisition, as well as certain capital expenditures related to support functions; and

•reliability capital expenditures, such as those required to maintain the current operating capacity of existing assets or extend their useful lives, as well as those required to maintain equipment reliability and safety.

The following table summarizes our capital expenditures:

	Strategic Capital Expenditures		Reliability Capital Expenditures		Total
	(Thousands of Dollars)
For the six months ended June 30:
2023	$	43,797	$	10,735	$	54,532
2022	$	58,020	$	13,405	$	71,425
Expected for the year ended December 31, 2023	$125,000 - 145,000		$25,000 - 35,000

Strategic capital expenditures for the six months ended June 30, 2023 and 2022 mainly consisted of expansion projects on our Permian Crude System and Central West Refined Products Pipelines, as well as biofuel and other projects at our West Coast Terminals. Reliability capital expenditures primarily related to maintenance upgrade projects at our terminals.

We expect our strategic capital expenditures for the year ended December 31, 2023 to include spending of approximately $35.0 to $45.0 million on expansion projects to accommodate production growth in the Permian Basin and approximately $25.0 million on projects to expand our renewable fuels network on the West Coast. We expect a portion of the remaining strategic capital expenditures to also include connection projects on our ammonia pipeline. We continue to evaluate our capital budget and internal growth projects can be accelerated or scaled back depending on market conditions or customer demand. Therefore, our actual capital expenditures for 2023 may increase or decrease from the expected amounts noted above.

Series D Preferred Units Redemption Features

We have redeemed and repurchased a portion of our Series D Preferred Units, as shown below:

Redemption/Repurchase Date	Units Redeemed/Repurchased	Redemption/ Repurchase Price per Unit, including Accrued Distributions	Redemption/Repurchase Price, including Accrued Distributions
			(Thousands of Dollars)
July 31, 2023	2,560,000	$32.18	$	82,381
June 30, 2023	5,500,000	$31.88	$	175,340
November 22, 2022	6,900,000	$32.73	$	225,837

31

Table of Contents

We may redeem all or any portion of the remaining 8,286,650 Series D Preferred Units outstanding as of July 31, 2023 in an amount not less than $50.0 million for cash at a redemption price equal to, as applicable: (i) $31.73 per Series D Preferred Unit, or up to $262.9 million, at any time on or after June 29, 2023 but prior to June 29, 2024; (ii) $30.46 per Series D Preferred Unit, or up to $252.4 million, at any time on or after June 29, 2024 but prior to June 29, 2025; (iii) $29.19 per Series D Preferred Unit, or up to $241.9 million, at any time on or after June 29, 2025; plus, in each case, the sum of any unpaid distributions on the applicable Series D Preferred Unit plus the distributions prorated for the number of days elapsed (not to exceed 90) in the period of redemption (Series D Partial Period Distributions).

Additionally, at any time on or after June 29, 2028, each holder of Series D Preferred Units will have the right to require us to redeem all of the Series D Preferred Units held by such holder at a redemption price equal to $29.19 per Series D Preferred Unit, plus any unpaid Series D distributions plus the Series D Partial Period Distributions. If a holder of Series D Preferred Units exercises its redemption right, we may elect to pay up to 50% of such amount in common units (which shall be valued at 93% of a volume-weighted average trading price of the common units); provided, that the common units to be issued do not, in the aggregate, exceed 15% of NuStar Energy’s common equity market capitalization at the time.

Distributions

Preferred Units. Distributions on our preferred units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month.

The distribution rates on the outstanding Series D Preferred Units are as follows: (i) 9.75% per annum ($0.619 per unit per distribution period) for the first two years (beginning with the September 17, 2018 distribution); (ii) 10.75% per annum ($0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter. The number of Series D Preferred Units outstanding as of June 30, 2023 and December 31, 2022 totaled 10,846,650 and 16,346,650, respectively. While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. Any Series D Preferred Unit distributions in excess of $0.635 may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash.

The distribution rate on our Series D Preferred Units increased on June 15, 2023, to the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit. Distributions accrued for redeemed units from the notification dates to the redemption dates are reported in “Interest expense, net” on the condensed consolidated statements of comprehensive income and are excluded from total distributions below. Distribution information on our Series D Preferred Units is as follows:

Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

Information on our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units) is shown below:

Units	Units Issued and Outstanding as of June 30, 2023	Optional Redemption Date/Date When Distribution Rate Became Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	9,060,000	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	15,400,000	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	6,900,000	December 15, 2022	Three-month LIBOR plus 6.88%

32

Table of Contents

Distribution information on our Series A, B and C Preferred Units is as follows:

	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)
June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010

(a) Total distributions are estimated based on the number of units outstanding as of June 30, 2023.

In July 2023, our board of directors declared distributions with respect to the Series A, B and C Preferred Units and the Series D Preferred Units to be paid on September 15, 2023.

Common Units. Distribution payments are made to our common limited partners within 45 days after the end of each quarter as of a record date that is set after the end of each quarter. In July 2023, our board of directors declared distributions with respect to our common units for the quarter ended June 30, 2023. The following table summarizes information about quarterly cash distributions to our common limited partners applicable to the period in which the distributions were earned:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

Debt Obligations

The following table summarizes our debt obligations:

	Maturity			Outstanding Obligations as of June 30, 2023
				(Thousands of Dollars)
5.75% senior notes	October 1, 2025			$	600,000
6.00% senior notes	June 1, 2026			$	500,000
Receivables Financing Agreement, 6.7% as of June 30, 2023	July 1, 2026			$	71,200
Revolving Credit Agreement, 7.7% as of June 30, 2023	January 27, 2027			$	245,000
5.625% senior notes	April 28, 2027			$	550,000
6.375% senior notes	October 1, 2030			$	600,000
GoZone Bonds 5.85% - 6.35%	2038	thru	2041	$	322,140
Subordinated Notes, 12.0% as of June 30, 2023	January 15, 2043			$	402,500

We believe that, as of June 30, 2023, we are in compliance with the ratios and covenants applicable to our debt obligations. A default under certain of our debt obligations would be considered an event of default under other of our debt obligations. Please refer to Note 4 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a discussion of certain of our debt obligations.

Guarantor Summarized Financial Information. NuStar Energy has no operations, and its assets consist mainly of its 100% ownership interest in its indirectly owned subsidiaries, NuStar Logistics and NuPOP. The senior and subordinated notes issued by NuStar Logistics are fully and unconditionally guaranteed by NuStar Energy and NuPOP. Each guarantee of the senior notes by NuStar Energy and NuPOP ranks equally in right of payment with all other existing and future unsecured senior indebtedness of that guarantor, is structurally subordinated to all existing and any future indebtedness and obligations of any subsidiaries of that guarantor that do not guarantee the notes and ranks senior to its guarantee of our subordinated indebtedness. Each guarantee of the subordinated notes by NuStar Energy and NuPOP ranks equal in right of payment with all other existing and future subordinated indebtedness of that guarantor and subordinated in right of payment and upon liquidation to the prior payment in full of all other existing and future senior indebtedness of that guarantor. NuPOP will be released from its guarantee when it no longer guarantees any obligations of NuStar Energy or any of its subsidiaries, including NuStar Logistics, under any bank credit facility or public debt instrument. The rights of holders of our senior and subordinated notes may be limited under

33

Table of Contents

the U.S. Bankruptcy Code or state fraudulent transfer or conveyance law. Please refer to Note 4 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a discussion of certain of our debt obligations.

The following tables present summarized combined balance sheet and income statement information for NuStar Energy, NuStar Logistics and NuPOP (collectively, the Guarantor Issuer Group). Intercompany items among the Guarantor Issuer Group have been eliminated in the summarized combined financial information below, as well as intercompany balances and activity for the Guarantor Issuer Group with non-guarantor subsidiaries, including the Guarantor Issuer Group’s investment balances in non-guarantor subsidiaries.

Summarized Combined Balance Sheet Information:
	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Current assets	$	36,319	$	44,328
Long-term assets	$	3,178,600	$	3,210,483
Current liabilities (a)	$	128,114	$	120,633
Long-term liabilities, including long-term debt	$	3,390,522	$	3,279,200
Mandatorily redeemable Series D preferred units	$	81,229	$	—
Series D preferred limited partners interests	$	230,264	$	446,970
(a)Excludes $1,784.1 million and $1,694.4 million of net intercompany payables as of June 30, 2023 and December 31, 2022, respectively, due to the non-guarantor subsidiaries from the Guarantor Issuer Group.

Long-term assets for the non-guarantor subsidiaries totaled $1,544.9 million and $1,559.3 million as of June 30, 2023 and December 31, 2022, respectively.

Summarized Combined Income Statement Information:
	Six Months Ended June 30, 2023
	(Thousands of Dollars)
Revenues	$	401,386
Operating income	$	173,518
Interest expense, net	$	(114,320)
Net income	$	59,539

Revenues and net income for the non-guarantor subsidiaries totaled $370.8 million and $92.5 million, respectively, for the six months ended June 30, 2023.

Contractual Obligations

On March 21, 2023, we entered into an operating lease agreement for our Corporate Headquarters with an initial term of twenty years, with two renewal options of ten years each. During the initial term, rent under the lease starts at $6.4 million per year and increases annually by 2.5%. Please refer to Note 2 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further discussion.

Environmental, Health and Safety

Our operations in the U.S. and Mexico are subject to extensive international, federal, state and local environmental laws and regulations, including those relating to the discharge of materials into the environment, waste management, remediation, the characteristics and composition of fuels, climate change and greenhouse gases. Our operations are also subject to extensive health, safety and security laws and regulations, including those relating to worker and pipeline safety, pipeline and storage tank integrity and operations security. Because more stringent environmental and safety laws and regulations are continuously being enacted or proposed, the level of expenditures required for environmental, health and safety matters is expected to increase in the future.

34

Table of Contents

CRITICAL ACCOUNTING POLICIES

The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions related thereto that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Our critical accounting policies are disclosed in our Annual Report on Form 10-K for the year ended December 31, 2022.

35

Table of Contents

Item 3.     Quantitative and Qualitative Disclosures About Market Risk

INTEREST RATE RISK

Debt

We manage our exposure to changing interest rates principally through the use of a combination of fixed-rate debt and variable-rate debt. Borrowings under our variable-rate debt expose us to increases in interest rates.

On June 30, 2023, we amended our Revolving Credit Agreement, mainly to extend the maturity date from April 27, 2025 to January 27, 2027. On June 29, 2023, we amended our Receivables Financing Agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. Please refer to Note 4 of the Condensed Notes to the Consolidated Financial Statements in Item 1. "Financial Statements" for more information.

The following tables present principal cash flows and related weighted-average interest rates by expected maturity dates for our long-term debt, excluding finance leases:

	June 30, 2023
	Expected Maturity Dates
	2023		2024		2025			2026			2027			Thereafter			Total			Fair Value
	(Thousands of Dollars, Except Interest Rates)
Fixed-rate debt	$	—	$	—	$	600,000		$	500,000		$	550,000		$	922,140		$	2,572,140		$	2,526,199
Weighted-average rate	—		—		5.8		%	6.0		%	5.6		%	6.3		%	6.0		%	—
Variable-rate debt	$	—	$	—	$	—		$	71,200		$	245,000		$	402,500		$	718,700		$	724,500
Weighted-average rate	—		—		—			6.7		%	7.7		%	12.0		%	10.0		%	—

	December 31, 2022
	Expected Maturity Dates
	2023		2024		2025			2026			2027			Thereafter			Total			Fair Value
	(Thousands of Dollars, Except Interest Rates)
Fixed-rate debt	$	—	$	—	$	600,000		$	500,000		$	550,000		$	922,140		$	2,572,140		$	2,478,720
Weighted-average rate	—		—		5.8		%	6.0		%	5.6		%	6.3		%	6.0		%	—
Variable-rate debt	$	—	$	—	$	300,900		$	—		$	—		$	402,500		$	703,400		$	690,944
Weighted-average rate	—		—		6.7		%	—			—			10.8		%	9.0		%	—

Series A, B and C Preferred Units

Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or the next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month. The Series A, B and C Preferred Units expose us to changes in interest rates as the distribution rates on these units converted to a floating rate on December 15, 2021, June 15, 2022 and December 15, 2022, respectively. Based upon the 9,060,000 Series A Preferred Units, 15,400,000 Series B Preferred Units and 6,900,000 Series C Preferred Units outstanding at June 30, 2023 and the $25.00 liquidation preference per unit, a change of 1.0% in interest rates would increase or decrease the annual distributions on our Series A, B and C Preferred Units by an aggregate amount of $7.8 million. Please see Note 7 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for additional information on our Series A, B and C Preferred Units.

COMMODITY PRICE RISK

Since the operations of our fuels marketing segment expose us to commodity price risk, we also use derivative instruments to attempt to mitigate the effects of commodity price fluctuations. Derivative financial instruments associated with commodity price risk were not material for any periods presented.

36

Table of Contents

Item 4.     Controls and Procedures

(a)Evaluation of disclosure controls and procedures.

Our management has evaluated, with the participation of the principal executive officer and principal financial officer of NuStar GP, LLC, the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934) as of the end of the period covered by this report, and has concluded that our disclosure controls and procedures were effective as of June 30, 2023.

(b)Changes in internal control over financial reporting.

There has been no change in our internal control over financial reporting that occurred during our last fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

37

Table of Contents

PART II - OTHER INFORMATION

Item 5.     Other Information

Rule 10b5-1 under the Exchange Act provides an affirmative defense that enables prearranged transactions in securities in a manner that avoids concerns about initiating transactions at a future date while possibly in possession of material nonpublic information. Our Insider Trading Policy permits our directors and executive officers to enter into trading plans designed to comply with Rule 10b5-1. During the three-month period ending June 30, 2023, none of our executive officers or directors adopted or terminated a Rule 10b5-1 trading plan or adopted or terminated a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K).

38

Table of Contents

Item 6.Exhibits

Exhibit Number		Description
10.01		First Amendment to Second Amended and Restated 5-Year Revolving Credit Agreement, dated as of June 30, 2023, among NuStar Logistics, L.P., NuStar Energy L.P., NuStar Pipeline Operating Partnership L.P., Wells Fargo Bank, National Association, and the lenders party thereto (incorporated by reference to Exhibit 10.01 to NuStar Energy L.P.’s Current Report on Form 8-K filed June 30, 2023 (File No. 001-16417))
10.02		Seventh Amendment to the Receivables Financing Agreement, dated as of June 29, 2023, among NuStar Finance LLC, NuStar Energy L.P. and PNC Bank, National Association (incorporated by reference to Exhibit 10.02 to NuStar Energy L.P.’s Current Report on Form 8-K filed June 30, 2023 (File No. 001-16417))
10.03		Amended and Restated NuStar Energy L.P. 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.01 to NuStar Energy L.P.’s Current Report on Form 8-K filed April 28, 2023 (File No. 001-16417))
22.01		Subsidiary Guarantors and Issuers of Guaranteed Securities (incorporated by reference to Exhibit 22.01 to NuStar Energy L.P.’s Annual Report on Form 10-K for year ended December 31, 2022 (File No. 001-16417))
*31.01		Rule 13a-14(a) Certification (under Section 302 of the Sarbanes-Oxley Act of 2002) of principal executive officer
*31.02		Rule 13a-14(a) Certification (under Section 302 of the Sarbanes-Oxley Act of 2002) of principal financial officer
**32.01		Section 1350 Certification (under Section 906 of the Sarbanes-Oxley Act of 2002) of principal executive officer
**32.02		Section 1350 Certification (under Section 906 of the Sarbanes-Oxley Act of 2002) of principal financial officer
*101.INS		Inline XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
*101.SCH		Inline XBRL Taxonomy Extension Schema Document
*101.CAL		Inline XBRL Taxonomy Extension Calculation Linkbase Document
*101.DEF		Inline XBRL Taxonomy Extension Definition Linkbase Document
*101.LAB		Inline XBRL Taxonomy Extension Label Linkbase Document
*101.PRE		Inline XBRL Taxonomy Extension Presentation Linkbase Document
*104		Cover Page Interactive Data File - Formatted in Inline XBRL and contained in Exhibit 101
*	Filed herewith.
**	Furnished herewith.

39

Table of Contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

NUSTAR ENERGY L.P.

(Registrant)

By: Riverwalk Logistics, L.P., its general partner

By: NuStar GP, LLC, its general partner

By:	/s/ Bradley C. Barron
	Bradley C. Barron
	Chairman of the Board, President and Chief Executive Officer
	August 4, 2023
By:	/s/ Thomas R. Shoaf
	Thomas R. Shoaf
	Executive Vice President and Chief Financial Officer
	August 4, 2023
By:	/s/ Jorge A. del Alamo
	Jorge A. del Alamo
	Senior Vice President and Controller
	August 4, 2023

40

EX-31.01

Exhibit 31.01

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Bradley C. Barron, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NuStar Energy L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

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

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2023

/s/ Bradley C. Barron

Bradley C. Barron

Chairman of the Board, President and Chief Executive Officer

EX-31.02

Exhibit 31.02

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas R. Shoaf, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NuStar Energy L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

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

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2023

/s/ Thomas R. Shoaf

Thomas R. Shoaf

Executive Vice President and Chief Financial Officer

EX-32.01

Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NuStar Energy L.P. (the Partnership) on Form 10-Q for the quarter ended June 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Bradley C. Barron, Chairman of the Board, President and Chief Executive Officer of NuStar GP, LLC, the general partner of the general partner of the Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

/s/ Bradley C. Barron

Bradley C. Barron

Chairman of the Board, President and Chief Executive Officer

August 4, 2023

EX-32.02

Exhibit 32.02

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NuStar Energy L.P. (the Partnership) on Form 10-Q for the quarter ended June 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Thomas R. Shoaf, Executive Vice President and Chief Financial Officer of NuStar GP, LLC, the general partner of the general partner of the Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

/s/ Thomas R. Shoaf

Thomas R. Shoaf

Executive Vice President and Chief Financial Officer

August 4, 2023

XML

DEI Document - shares	6 Months Ended
	Jun. 30, 2023	Jul. 31, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	1-16417
Entity Registrant Name	NuStar Energy L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2956831
Entity Address, Street	19003 IH-10 West
Entity Address, City	San Antonio
Entity Address, State	TX
Entity Address, Zip Code	78257
City Area Code	210
Entity Local Phone Number	918-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Partnership Units Outstanding		110,907,171
Entity Central Index Key	0001110805
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Units
Trading Symbol	NS
Security Exchange Name	NYSE
Series A Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	8.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprA
Security Exchange Name	NYSE
Series B Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	7.625% Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprB
Security Exchange Name	NYSE
Series C Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprC
Security Exchange Name	NYSE

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 3,813	$ 14,489
Accounts receivable, net	125,116	149,971
Inventories	10,477	15,397
Prepaid and other current assets	27,548	24,067
Total current assets	166,954	203,924
Property, plant and equipment, at cost	5,693,440	5,733,685
Accumulated depreciation and amortization	(2,397,938)	(2,330,602)
Property, plant and equipment, net	3,295,502	3,403,083
Intangible assets, net	494,880	513,696
Goodwill	732,356	732,356
Other long-term assets, net	200,723	120,627
Total assets	4,890,415	4,973,686
Current liabilities:
Accounts payable	64,938	67,765
Current portion of finance leases	4,677	4,416
Accrued interest payable	38,476	37,607
Accrued liabilities	66,168	76,072
Taxes other than income tax	7,695	10,607
Total current liabilities	181,954	196,467
Long-term debt, less current portion of finance leases	3,310,561	3,293,415
Deferred income tax liability	3,262	3,219
Mandatorily redeemable Series D preferred units (Note 6)	81,229	0
Other long-term liabilities	213,828	131,299
Total liabilities	3,790,834	3,624,400
Commitments and contingencies (Note 5)
Series D preferred limited partners (Note 6)	230,264	446,970
Partners’ equity (Note 7):
Common limited partners (110,906,500 and 110,818,718 units outstanding as of June 30, 2023 and December 31, 2022, respectively)	144,409	177,620
Accumulated other comprehensive loss	(31,393)	(31,605)
Total partners’ equity	869,317	902,316
Total liabilities, mezzanine equity and partners’ equity	4,890,415	4,973,686
Series A Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	218,307	218,307
Series B Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	371,476	371,476
Series C Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	$ 166,518	$ 166,518

XML

CONSOLIDATED BALANCE SHEETS (parenthetical) - shares	Jun. 30, 2023	Dec. 31, 2022
Limited partners common units outstanding	110,906,500	110,818,718
Series A Preferred Limited Partner [Member]
Preferred units outstanding	9,060,000	9,060,000
Series B Preferred Limited Partner [Member]
Preferred units outstanding	15,400,000	15,400,000
Series C Preferred Limited Partner [Member]
Preferred units outstanding	6,900,000	6,900,000

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Impairment loss	$ 0	$ 0	$ 0	$ 46,122
General and administrative expenses (excluding depreciation and amortization expense)	31,620	27,909	60,345	54,980
Other depreciation and amortization expense	1,037	1,823	2,592	3,647
Total costs and expenses	275,464	321,098	550,421	672,535
Gain on sale of assets	0	0	41,075	0
Operating income	102,870	109,059	262,855	167,485
Income before income tax expense	47,333	60,130	154,456	72,409
Net income	46,141	59,199	152,077	71,511
Costs and expenses:
Interest expense, net	(58,170)	(50,941)	(115,541)	(100,759)
Other income, net	2,633	2,012	7,142	5,683
Income tax expense	$ 1,192	$ 931	$ 2,379	$ 898
Basic net income (loss) per common unit (Note 8)	$ (0.20)	$ 0.20	$ 0.42	$ (0.02)
Diluted net income (loss) per common unit (Note 8)	$ (0.20)	$ 0.20	$ 0.42	$ (0.02)
Basic weighted-average common units outstanding	110,905,471	110,306,641	110,893,293	110,242,201
Diluted weighted-average common units outstanding	110,905,471	110,306,641	110,893,293	110,242,201
Comprehensive income	$ 46,149	$ 100,073	$ 152,289	$ 113,317
Service [Member]
Revenues:
Total revenues	275,367	278,067	560,633	543,372
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	93,363	94,948	182,525	181,350
Depreciation and amortization expense	62,530	62,240	124,584	125,543
Total costs associated with service revenues/Costs associated with product sales	155,893	157,188	307,109	306,893
Product [Member]
Revenues:
Total revenues	102,967	152,090	211,568	296,648
Costs and expenses:
Total costs associated with service revenues/Costs associated with product sales	86,914	134,178	180,375	260,893
Product and Service [Member]
Revenues:
Total revenues	$ 378,334	$ 430,157	$ 772,201	$ 840,020

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows from Operating Activities:
Net income (loss)	$ 152,077	$ 71,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	127,176	129,190
Amortization of unit-based compensation	7,302	6,746
Amortization of debt related items	5,224	5,085
Gain on sale of assets	(41,075)	0
Impairment loss	0	46,122
Changes in current assets and current liabilities (Note 9)	1,785	(30,940)
Decrease in other long-term assets, net	5,692	6,626
Increase (decrease) in other long-term liabilities	796	(6,218)
Other, net	(6,672)	(5,835)
Net cash provided by operating activities	252,305	222,287
Cash Flows from Investing Activities:
Capital expenditures	(54,532)	(71,425)
Change in accounts payable related to capital expenditures	1,450	(8,716)
Proceeds from insurance recoveries	12,395	5,805
Proceeds from sale or disposition of assets, net of transaction costs	102,769	59,531
Net cash provided by (used in) investing activities	62,082	(14,805)
Cash Flows from Financing Activities:
Proceeds from long-term debt borrowings	443,000	480,400
Long-term debt repayments	(427,700)	(528,100)
Redemption of Series D preferred units	(174,515)	0
Distributions to preferred unitholders	(64,890)	(62,432)
Distributions to common unitholders	(88,724)	(88,164)
Other, net	(12,376)	(11,243)
Net cash used in financing activities	(325,205)	(209,539)
Effect of foreign exchange rate changes on cash	310	763
Net decrease in cash, cash equivalents and restricted cash	(10,508)	(1,294)
Cash, cash equivalents and restricted cash as of the beginning of the period	23,377	14,439
Cash, cash equivalents and restricted cash as of the end of the period	$ 12,869	$ 13,145

XML

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY - USD ($) $ in Thousands	Total	AOCI [Member]	Preferred Limited Partner [Member]	Common Limited Partner [Member]	Series D Preferred Limited Partner [Member]
Partners' capital - beginning balance at Dec. 31, 2021	$ 981,825	$ (73,978)	$ 756,301	$ 299,502
Temporary equity - beginning balance at Dec. 31, 2021	616,439
Partners' capital and temporary equity - beginning balance at Dec. 31, 2021	1,598,264
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	71,511	0	30,907	8,896
Net income (loss) excluding portion attributable to temporary equity	39,803
Net income, temporary equity					$ 31,708
Other comprehensive income (loss)	41,806	41,806
Cash distributions to partners			(30,907)	(88,164)
Cash distributions to partners, temporary equity					(31,708)
Unit-based compensation	9,591			9,591
Series D Preferred Unit accretion, common	(9,315)			(9,315)
Series D Preferred Unit accretion, preferred					9,315
Series D Preferred Unit accretion, total	0
Other	1	0	0	1
Other, temporary equity					(3)
Other, including temporary equity	(2)
Partners' capital - ending balance at Jun. 30, 2022	944,640	(32,172)	756,301	220,511
Temporary equity - ending balance at Jun. 30, 2022	625,751
Partners' capital and temporary equity - ending balance at Jun. 30, 2022	1,570,391
Partners' capital - beginning balance at Mar. 31, 2022	922,265	(73,046)	756,301	239,010
Temporary equity - beginning balance at Mar. 31, 2022	621,018
Partners' capital and temporary equity - beginning balance at Mar. 31, 2022	1,543,283
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	59,199	0	15,669	27,676
Net income (loss) excluding portion attributable to temporary equity	43,345
Net income, temporary equity					15,854
Other comprehensive income (loss)	40,874	40,874
Cash distributions to partners			(15,669)	(44,123)
Cash distributions to partners, temporary equity					(15,854)
Unit-based compensation	2,681			2,681
Series D Preferred Unit accretion, common	(4,734)			(4,734)
Series D Preferred Unit accretion, preferred					4,734
Series D Preferred Unit accretion, total	0
Other	1	0	0	1
Other, temporary equity					(1)
Other, including temporary equity	0
Partners' capital - ending balance at Jun. 30, 2022	944,640	(32,172)	756,301	220,511
Temporary equity - ending balance at Jun. 30, 2022	625,751
Partners' capital and temporary equity - ending balance at Jun. 30, 2022	1,570,391
Partners' capital - beginning balance at Dec. 31, 2022	902,316	(31,605)	756,301	177,620
Temporary equity - beginning balance at Dec. 31, 2022	446,970
Partners' capital and temporary equity - beginning balance at Dec. 31, 2022	1,349,286
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	152,077	0	43,696	87,218
Net income (loss) excluding portion attributable to temporary equity	130,914
Net income, temporary equity					21,163
Other comprehensive income (loss)	212	212
Cash distributions to partners			(43,696)	(88,724)
Cash distributions to partners, temporary equity					(21,163)
Unit-based compensation	7,390			7,390
Series D Preferred Unit accretion, common	(6,974)			(6,974)
Series D Preferred Unit accretion, preferred					6,974
Series D Preferred Unit accretion, total	0
Series D preferred unit redemption	(255,744)			(32,067)	(223,677)
Other	(54)	0	0	(54)
Other, temporary equity					(3)
Other, including temporary equity	(57)
Partners' capital - ending balance at Jun. 30, 2023	869,317	(31,393)	756,301	144,409
Temporary equity - ending balance at Jun. 30, 2023	230,264
Partners' capital and temporary equity - ending balance at Jun. 30, 2023	1,099,581
Partners' capital - beginning balance at Mar. 31, 2023	932,064	(31,401)	756,301	207,164
Temporary equity - beginning balance at Mar. 31, 2023	450,641
Partners' capital and temporary equity - beginning balance at Mar. 31, 2023	1,382,705
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	46,141	0	22,112	14,015
Net income (loss) excluding portion attributable to temporary equity	36,127
Net income, temporary equity					10,014
Other comprehensive income (loss)	8	8
Cash distributions to partners			(22,112)	(44,362)
Cash distributions to partners, temporary equity					(10,014)
Unit-based compensation	3,006			3,006
Series D Preferred Unit accretion, common	(3,303)			(3,303)
Series D Preferred Unit accretion, preferred					3,303
Series D Preferred Unit accretion, total	0
Series D preferred unit redemption	(255,744)			(32,067)	(223,677)
Other	(44)	0	0	(44)
Other, temporary equity					$ (3)
Other, including temporary equity	(47)
Partners' capital - ending balance at Jun. 30, 2023	869,317	$ (31,393)	$ 756,301	$ 144,409
Temporary equity - ending balance at Jun. 30, 2023	230,264
Partners' capital and temporary equity - ending balance at Jun. 30, 2023	$ 1,099,581

XML

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Common Limited Partner [Member]
Cash distributions paid, per unit	$ 0.40	$ 0.40	$ 0.80	$ 0.80

XML

ORGANIZATION AND BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND BASIS OF PRESENTATION

ORGANIZATION AND BASIS OF PRESENTATION

Organization and Operations

NuStar Energy L.P. (NYSE: NS) is a Delaware limited partnership primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole. Our business is managed under the direction of the board of directors of NuStar GP, LLC, the general partner of our general partner, Riverwalk Logistics, L.P., both of which are indirectly wholly owned subsidiaries of ours.

We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing.

Recent Developments

Partial Redemptions of Series D Preferred Units. On June 30, 2023, we redeemed an aggregate 5,500,000 of our Series D Cumulative Convertible Preferred Units (Series D Preferred Units), at a price per unit of $31.88, for an aggregate purchase price of $175.3 million. On June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem an aggregate 2,560,000 of our Series D Preferred Units, at a price per unit of $32.18 for an aggregate purchase price of $82.4 million. This redemption closed on July 31, 2023. Please see Note 6 for additional information on these redemptions.

Debt Amendments. On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement, mainly to extend the maturity date from April 27, 2025 to January 27, 2027. On June 29, 2023, we amended our $100.0 million receivables financing agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. Please refer to Note 4 for more information.

Basis of Presentation

These unaudited condensed consolidated financial statements include the accounts of the Partnership and subsidiaries in which the Partnership has a controlling interest. Inter-partnership balances and transactions have been eliminated in consolidation.

These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, and all disclosures are adequate. All such adjustments are of a normal recurring nature unless disclosed otherwise. Operating results for the six months ended June 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2022.

XML

DISPOSITIONS

6 Months Ended

Jun. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITIONS

DISPOSITIONS

Sale-Leaseback Transaction

On March 21, 2023, we sold our corporate headquarters facility and approximately 24 acres of underlying land located in San Antonio, Texas (the Corporate Headquarters) for an aggregate cash sales price of approximately $103.0 million and immediately leased back the Corporate Headquarters for an initial term of twenty years, with two renewal options of ten years each (the Sale-Leaseback Transaction). Upon closing of the sale in the first quarter of 2023, the Sale-Leaseback Transaction qualified as a completed sale, and we recognized a gain of $41.1 million, which is presented in “Gain on sale of assets” on the condensed consolidated statements of comprehensive income. We entered into the Sale-leaseback Transaction in order to monetize the Corporate Headquarters and used the proceeds to repay borrowings on our revolving credit agreement.

Pursuant to the lease agreement, rent for the initial term starts at $6.4 million per year and increases annually by 2.5%. At inception of the lease, right-of-use assets and lease liabilities associated with the Sale-Leaseback Transaction assumed a reasonably certain term of 20 years and were included in our consolidated balance sheet as follows (thousands of dollars):

Operating lease right-of-use assets:
Other long-term assets, net	$	82,230
Operating lease liabilities:
Accrued liabilities	$	710
Other long-term liabilities	81,498
Total operating lease liabilities	$	82,208

Following our entrance into the Sale-Leaseback Transaction, the weighted-average discount rate for our operating leases was 6.1%.

Point Tupper Terminal Disposition

On April 29, 2022, we sold the equity interests in our wholly owned subsidiaries that owned our Point Tupper terminal facility in Nova Scotia, Canada (the Point Tupper Terminal Operations) to EverWind Fuels for $60.0 million. The terminal facility had a storage capacity of 7.8 million barrels and was included in the storage segment. We used the sales proceeds to reduce debt and improve our debt metrics.

During the first quarter of 2022, we determined the Point Tupper Terminal Operations met the criteria to be classified as held for sale. We compared the carrying value of the Point Tupper Terminal Operations, which included $42.2 million in cumulative foreign currency translation losses accumulated since our acquisition of the Point Tupper terminal facility in 2005, to its fair value less costs to sell, and we recognized a pre-tax impairment loss of $46.1 million in the first quarter of 2022, which is presented in "Impairment loss" on the condensed consolidated statements of comprehensive income. We believe that the sales price of $60.0 million provided a reasonable indication of the fair value of the Point Tupper Terminal Operations as it represented an exit price in an orderly transaction between market participants. The sales price was a quoted price for identical assets and liabilities in a market that was not active and, thus, our fair value estimate fell within Level 2 of the fair value hierarchy. Upon closing in the second quarter of 2022, we released $39.6 million of foreign currency translation losses from accumulated other comprehensive loss and finalized our sales price, resulting in a gain of $1.6 million, which was presented in “Other income, net” on the condensed consolidated statement of comprehensive income for the period.

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

REVENUE FROM CONTRACTS WITH CUSTOMERS

REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract Assets and Contract Liabilities

The following table provides information about contract assets and contract liabilities from contracts with customers:

	2023				2022
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,612	$	(17,647)	$	2,336	$	(15,443)
Noncurrent portion	304		(41,405)		504		(46,027)
Total	2,916		(59,052)		2,840		(61,470)
Activity:
Additions	3,782		(45,998)		2,112		(17,692)
Transfer to accounts receivable	(2,856)		—		(2,198)		—
Transfer to revenues	—		33,718		(83)		24,841
Total	926		(12,280)		(169)		7,149
Balances as of June 30:
Current portion	2,703		(27,379)		2,251		(13,555)
Noncurrent portion	1,139		(43,953)		420		(40,766)
Total	$	3,842	$	(71,332)	$	2,671	$	(54,321)

Current contract assets are included in “Prepaid and other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheets. The current portion of contract liabilities is included in “Accrued liabilities” and the noncurrent portion of contract liabilities is included in “Other long-term liabilities” on the consolidated balance sheets.

Remaining Performance Obligations

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2023:

	Remaining Performance Obligations
	(Thousands of Dollars)
2023 (remaining)	$	204,812
2024	337,666
2025	229,535
2026	163,771
2027	81,059
Thereafter	124,800
Total	$	1,141,643

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to customer contracts that have fixed pricing and fixed volume terms and conditions, including contracts with payment obligations for minimum volume commitments.

Disaggregation of Revenues

The following table disaggregates our revenues:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	93,186	$	94,010	$	189,789	$	180,134
Refined products and ammonia pipelines	113,515		106,555		230,095		209,114
Total pipeline segment revenues from contracts with customers	206,701		200,565		419,884		389,248
Storage segment:
Throughput terminals	23,839		30,929		51,154		57,370
Storage terminals (excluding lessor revenues)	43,049		47,089		85,065		97,808
Total storage segment revenues from contracts with customers	66,888		78,018		136,219		155,178
Lessor revenues	11,321		10,765		22,647		21,526
Total storage segment revenues	78,209		88,783		158,866		176,704
Fuels marketing segment:
Revenues from contracts with customers	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

XML

DEBT

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

DEBT

DEBT

Revolving Credit Agreement

On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement (the Revolving Credit Agreement), mainly to extend the maturity date from April 27, 2025 to January 27, 2027. The amendment also includes a requirement that we certify that the sum of our Revolving Credit Agreement availability and unrestricted cash balance is no less than $150.0 million on a pro forma basis prior to using any borrowings under the Revolving Credit Agreement to redeem certain unsecured indebtedness or our Series D Preferred Units.

As of June 30, 2023, the Revolving Credit Agreement had $750.4 million available for borrowing and $245.0 million of borrowings outstanding. Letters of credit issued under the Revolving Credit Agreement totaled $4.6 million as of June 30, 2023 and limit the amount we can borrow under the Revolving Credit Agreement. Obligations under the Revolving Credit Agreement are guaranteed by NuStar Energy and NuPOP. The Revolving Credit Agreement provides for U.S. dollar borrowings, which bear interest, at our option, based on an alternative base rate or a SOFR-based rate. The Revolving Credit Agreement and certain fees under the Receivables Financing Agreement, defined below, are the only debt arrangements with interest rates that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of June 30, 2023, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 7.7%.

The Revolving Credit Agreement is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount that is less than the total amount available for borrowing. For a rolling period of four quarters, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may not exceed 5.00-to-1.00, and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. As of June 30, 2023, we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC, a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $100.0 million receivables financing agreement with a third-party lender (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). Under the Securitization Program, certain of NuStar Energy’s wholly owned subsidiaries sell their accounts receivable to NuStar Finance on an ongoing basis, and NuStar Finance provides the newly acquired accounts receivable as collateral for its revolving borrowings under the Receivables Financing Agreement. On June 29, 2023, we amended the Receivables Financing Agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. As of June 30, 2023, the amount of borrowings outstanding under the Receivables Financing Agreement totaled $71.2 million, the interest rate related to outstanding borrowings was 6.7% and $108.2 million of our accounts receivable was included in the Securitization Program.

Fair Value of Long-Term Debt

The estimated fair values and carrying amounts of long-term debt, excluding finance leases, were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Fair value	$	3,250,699	$	3,169,664
Carrying amount	$	3,260,205	$	3,242,289

We have estimated the fair value of our publicly traded notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded notes falls in Level 1 of the fair value hierarchy. With regard to our other debt, for which a quoted market price is not available, we have estimated the fair value using a discounted cash flow analysis using current incremental borrowing rates for similar types of borrowing arrangements and determined that the fair value falls in Level 2 of the fair value hierarchy. The carrying amount includes unamortized debt issuance costs.

XML

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIESWe have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $1.3 million and $0.3 million for contingent losses as of June 30, 2023 and December 31, 2022, respectively. The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

6 Months Ended

Jun. 30, 2023

Temporary Equity Disclosure [Abstract]

SERIES D CUMULATIVE COVERTIBLE PREFERRED UNITS

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

Partial Redemptions

On May 25, 2023 and June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem a portion of our outstanding Series D Preferred Units. The redemptions closed on June 30, 2023 and July 31, 2023, respectively, and were primarily funded with borrowings under our Revolving Credit Agreement, which had been partially paid down in the first quarter of 2023 with proceeds from the Sale-Leaseback Transaction. On the respective notification dates, those Series D Preferred Units became mandatorily redeemable; therefore, we reclassified those Series D Preferred Units from mezzanine equity to liability-classified “Mandatorily redeemable Series D preferred units” valued at the redemption price, excluding accrued distributions (Net Redemption Price). As of June 30, 2023, we presented the liability-classified Series D Preferred Units as non-current on our balance sheet as we had the intent and ability to refinance them on a long-term basis using our Revolving Credit Agreement. We recorded the difference between the carrying value of those Series D Preferred Units prior to reclassification and the Net Redemption Price as a deemed distribution, which reduced our common equity and reduced net income attributable to common units in the calculation of basic and diluted net income (loss) per common unit. At each closing, we accounted for the redemptions as extinguishments of debt. Distributions accrued for redeemed units from the notification dates to the redemption dates totaled $1.7 million for the three and six months ended June 30, 2023, and are reported in “Interest expense, net” on the condensed consolidated statements of comprehensive income.

Information related to the redemptions is shown below (thousands of dollars, except date, unit and per unit data):

	June 30, 2023 Redemption		July 31, 2023 Redemption
Notification date	May 25, 2023		June 29, 2023
Units redeemed	5,500,000		2,560,000
Redemption price per unit, including accrued distributions	$	31.88	$	32.18
Redemption price, including accrued distributions	$	175,340	$	82,381
Accrued distributions	825		1,152
Net Redemption Price	$	174,515	$	81,229
Carrying value of units at notification date	$	152,467	$	71,210
Net Redemption Price	174,515		81,229
Loss to common limited partners attributable to redemption	$	(22,048)	$	(10,019)
Loss per common limited partner unit attributable to redemption	$	(0.20)	$	(0.09)

Distributions

We allocate net income to our Series D Preferred Units equal to the amount of distributions earned during the period. Distributions on the Series D Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates and are payable on the 15th day (or next business day) of each of March, June, September and December, beginning September 17, 2018, to holders of record on the first business day of each payment month. The distribution rates on the Series D Preferred Units are as follows: (i) 9.75% per annum ($0.619 per unit per distribution period) for the first two years; (ii) 10.75% per annum ($0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter. While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. Any Series D Preferred Unit distributions in excess of $0.635 per unit may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash.

The distribution rate on our Series D Preferred Units increased on June 15, 2023, to the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit. Total distribution excludes amounts reported in “Interest expense, net” as described above under “Partial Redemptions of Series D Preferred Units.” Distribution information on our Series D Preferred Units is as follows:

Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148
June 15, 2022 - September 14, 2022	$	0.682	$	15,854
March 15, 2022 - June 14, 2022	$	0.682	$	15,854
December 15, 2021 - March 14, 2022	$	0.682	$	15,854

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

In July 2023, our board of directors declared distributions with respect to the Series D Preferred Units to be paid on September 15, 2023.

Units Issued and Outstanding

The following is a summary of our Series D Preferred Units issued and outstanding:

	Transaction Date	Price per Unit	Number of Units
Issuance	June 29, 2018	$25.38	15,760,441
Issuance	July 13, 2018	$25.38	7,486,209
Total units issued			23,246,650
Repurchase	November 22, 2022	$32.73	(6,900,000)
Units outstanding as of December 31, 2022			16,346,650
Redemption	June 30, 2023	$31.88	(5,500,000)
Units outstanding as of June 30, 2023			10,846,650

As of June 30, 2023, we reported 2,560,000 of the Series D Preferred Units outstanding in “Mandatorily redeemable Series D preferred units” and 8,286,650 Series D Preferred Units in “Mezzanine Equity” on the consolidated balance sheets. After the July 31, 2023 redemption, 8,286,650 Series D Preferred Units remain outstanding.

XML

PARTNERS' EQUITY

6 Months Ended

Jun. 30, 2023

Partners' Capital Notes [Abstract]

PARTNERS' EQUITY

PARTNERS' EQUITY

Series A, B and C Preferred Units

We allocate net income to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units) equal to the amount of distributions earned during the period. Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month.

Information on our Series A, B and C Preferred Units is shown below:

Units	Units Issued and Outstanding as of June 30, 2023	Optional Redemption Date/Date When Distribution Rate Became Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	9,060,000	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	15,400,000	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	6,900,000	December 15, 2022	Three-month LIBOR plus 6.88%

Distribution information on our Series A, B and C Preferred Units is as follows:

	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)
June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010
June 15, 2022 - September 14, 2022	$	0.54808	$	4,966	$	0.47789	$	7,360	$	0.56250	$	3,881
March 15, 2022 - June 14, 2022	$	0.47817	$	4,332	$	0.47657	$	7,339	$	0.56250	$	3,881
December 15, 2021 - March 14, 2022	$	0.43606	$	3,951	$	0.47657	$	7,339	$	0.56250	$	3,881

(a) Total distributions are estimated based on the number of units outstanding as of June 30, 2023.

In July 2023, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on September 15, 2023.

Common Limited Partners

We make quarterly distributions to common unitholders of 100% of our “Available Cash,” generally defined as cash receipts less cash disbursements, including distributions to our preferred units, and cash reserves established by the general partner, in

its sole discretion. These quarterly distributions are declared and paid within 45 days subsequent to each quarter-end. The common unitholders receive a distribution each quarter as determined by the board of directors, subject to limitation by the distributions in arrears, if any, on our preferred units. In July 2023, our board of directors declared distributions with respect to our common units for the quarter ended June 30, 2023.

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

Accumulated Other Comprehensive Income (Loss) (AOCI)

The balance of and changes in the components included in AOCI were as follows:

	Three Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of April 1	$	497	$	(33,865)	$	1,967	$	(31,401)	$	(40,932)	$	(35,957)	$	3,843	$	(73,046)
Other comprehensive income before reclassification adjustments	249		—		—		249		1,133		—		—		1,133
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(736)		(736)		—		—		(420)		(420)
Net loss on cash flow hedges reclassified into interest expense, net	—		505		—		505		—		521		—		521
Other	—		—		(10)		(10)		—		—		(6)		(6)
Other comprehensive income (loss)	249		505		(746)		8		40,779		521		(426)		40,874
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

	Six Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1	$	62	$	(34,380)	$	2,713	$	(31,605)	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)
Other comprehensive income before reclassification adjustments	684		—		—		684		1,962		—		—		1,962
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(1,473)		(1,473)		—		—		(840)		(840)
Net loss on cash flow hedges reclassified into interest expense, net	—		1,020		—		1,020		—		1,050		—		1,050
Other	—		—		(19)		(19)		—		—		(12)		(12)
Other comprehensive income (loss)	684		1,020		(1,492)		212		41,608		1,050		(852)		41,806
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

As of June 30, 2023, we expect to reclassify a loss of $3.3 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

XML

NET INCOME (LOSS) PER COMMON UNIT

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER COMMON UNIT

NET INCOME (LOSS) PER COMMON UNIT

Basic and diluted net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans and, beginning on June 15, 2023, the Series D Preferred Units. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to common units by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit by dividing net income (loss) attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units include the Series D Preferred Units.

The Series D Preferred Units contain certain unitholder conversion and redemption features, and we use the if-converted method to calculate the dilutive effect of the conversion or redemption feature that is most advantageous to our Series D preferred unitholders. The effect of the assumed conversion or redemption of the Series D Preferred Units outstanding was antidilutive for each of the three and six months ended June 30, 2023 and 2022; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

The following table details the calculation of basic and diluted net (loss) income per common unit:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Distributions to preferred limited partners	(32,126)		(31,523)		(64,859)		(62,615)
Distributions to common limited partners	(44,363)		(44,128)		(88,759)		(88,293)
Distribution equivalent rights to restricted units	(667)		(617)		(1,339)		(1,250)
Distributions in excess of income	$	(31,015)	$	(17,069)	$	(2,880)	$	(80,647)
Distributions to common limited partners	$	44,363	$	44,128	$	88,759	$	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)		(17,069)		(2,880)		(80,647)
Series D Preferred Unit accretion	(3,303)		(4,734)		(6,974)		(9,315)
Series D Preferred Unit redemption	(32,067)		—		(32,067)		—
Net (loss) income attributable to common units	$	(22,022)	$	22,325	$	46,838	$	(1,669)
Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201
Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	0.42	$	(0.02)

XML

SUPPLEMENTAL CASH FLOW INFORMATION

6 Months Ended

Jun. 30, 2023

Supplemental Cash Flow Information [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

SUPPLEMENTAL CASH FLOW INFORMATION

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	12,356	$	(21,262)
Inventories	4,920		1,439
Other current assets	(3,508)		705
Increase (decrease) in current liabilities:
Accounts payable	(2,427)		5,082
Accrued interest payable	869		567
Accrued liabilities	(8,300)		(14,448)
Taxes other than income tax	(2,125)		(3,023)
Changes in current assets and current liabilities	$	1,785	$	(30,940)

The above changes in current assets and current liabilities may differ from changes between amounts reflected in the applicable consolidated balance sheets due to:

•the change in the amount accrued for capital expenditures;

•the effect of accrued compensation expense paid with fully vested common unit awards; and

•current assets and current liabilities disposed of during the period.

Other supplemental cash flow information is as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	110,195	$	95,112
Cash paid for income taxes, net of tax refunds received	$	2,842	$	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	$	82,372	$	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$	1,818	$	1,342

Restricted cash, representing legally restricted funds that are unavailable for general use, is included in "Other long-term assets, net" on the consolidated balance sheets. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows is included in the consolidated balance sheets as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Cash and cash equivalents	$	3,813	$	14,489
Other long-term assets, net	9,056		8,888
Cash, cash equivalents and restricted cash	$	12,869	$	23,377

XML

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level.

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Revenues:
Pipeline	$	206,701	$	200,565	$	419,884	$	389,248
Storage	78,209		88,783		158,866		176,704
Fuels marketing	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020
Operating income:
Pipeline	$	107,804	$	100,953	$	227,662	$	196,705
Storage	21,213		31,207		43,979		16,232
Fuels marketing	6,510		6,631		13,076		13,175
Total segment operating income	135,527		138,791		284,717		226,112
Gain on sale of assets	—		—		41,075		—
General and administrative expenses	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total operating income	$	102,870	$	109,059	$	262,855	$	167,485

Total assets by reportable segment were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Pipeline	$	3,304,918	$	3,360,685
Storage	1,410,647		1,438,609
Fuels marketing	29,045		37,763
Total segment assets	4,744,610		4,837,057
Other partnership assets	145,805		136,629
Total consolidated assets	$	4,890,415	$	4,973,686

XML

ORGANIZATION AND BASIS OF PRESENTATION (Policies)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	Inter-partnership balances and transactions have been eliminated in consolidation.
Basis of Presentation	These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, and all disclosures are adequate. All such adjustments are of a normal recurring nature unless disclosed otherwise.

XML

NET INCOME (LOSS) PER COMMON UNIT (Policies)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Basic and Diluted Net Income (Loss) per Common Unit

Basic and diluted net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans and, beginning on June 15, 2023, the Series D Preferred Units. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to common units by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit by dividing net income (loss) attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units include the Series D Preferred Units.

The Series D Preferred Units contain certain unitholder conversion and redemption features, and we use the if-converted method to calculate the dilutive effect of the conversion or redemption feature that is most advantageous to our Series D preferred unitholders. The effect of the assumed conversion or redemption of the Series D Preferred Units outstanding was antidilutive for each of the three and six months ended June 30, 2023 and 2022; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

XML

SUPPLEMENTAL CASH FLOW INFORMATION (Policies)	6 Months Ended
	Jun. 30, 2023
Supplemental Cash Flow Information [Abstract]
Restricted Cash	Restricted cash, representing legally restricted funds that are unavailable for general use, is included in "Other long-term assets, net" on the consolidated balance sheets.

XML

DISPOSITIONS (Tables)

6 Months Ended

Jun. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

Sale leaseback transactions

At inception of the lease, right-of-use assets and lease liabilities associated with the Sale-Leaseback Transaction assumed a reasonably certain term of 20 years and were included in our consolidated balance sheet as follows (thousands of dollars):

Operating lease right-of-use assets:
Other long-term assets, net	$	82,230
Operating lease liabilities:
Accrued liabilities	$	710
Other long-term liabilities	81,498
Total operating lease liabilities	$	82,208

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides information about contract assets and contract liabilities from contracts with customers:

	2023				2022
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,612	$	(17,647)	$	2,336	$	(15,443)
Noncurrent portion	304		(41,405)		504		(46,027)
Total	2,916		(59,052)		2,840		(61,470)
Activity:
Additions	3,782		(45,998)		2,112		(17,692)
Transfer to accounts receivable	(2,856)		—		(2,198)		—
Transfer to revenues	—		33,718		(83)		24,841
Total	926		(12,280)		(169)		7,149
Balances as of June 30:
Current portion	2,703		(27,379)		2,251		(13,555)
Noncurrent portion	1,139		(43,953)		420		(40,766)
Total	$	3,842	$	(71,332)	$	2,671	$	(54,321)

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2023:

	Remaining Performance Obligations
	(Thousands of Dollars)
2023 (remaining)	$	204,812
2024	337,666
2025	229,535
2026	163,771
2027	81,059
Thereafter	124,800
Total	$	1,141,643

Disaggregation of Revenue [Table Text Block]

The following table disaggregates our revenues:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	93,186	$	94,010	$	189,789	$	180,134
Refined products and ammonia pipelines	113,515		106,555		230,095		209,114
Total pipeline segment revenues from contracts with customers	206,701		200,565		419,884		389,248
Storage segment:
Throughput terminals	23,839		30,929		51,154		57,370
Storage terminals (excluding lessor revenues)	43,049		47,089		85,065		97,808
Total storage segment revenues from contracts with customers	66,888		78,018		136,219		155,178
Lessor revenues	11,321		10,765		22,647		21,526
Total storage segment revenues	78,209		88,783		158,866		176,704
Fuels marketing segment:
Revenues from contracts with customers	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

XML

DEBT (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Fair Value and Carrying Value of Debt [Table Text Block]

The estimated fair values and carrying amounts of long-term debt, excluding finance leases, were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Fair value	$	3,250,699	$	3,169,664
Carrying amount	$	3,260,205	$	3,242,289

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS (Tables)

6 Months Ended

Jun. 30, 2023

Temporary Equity Disclosure [Abstract]

Mandatorily Redeemable Capital Stock

Information related to the redemptions is shown below (thousands of dollars, except date, unit and per unit data):

	June 30, 2023 Redemption		July 31, 2023 Redemption
Notification date	May 25, 2023		June 29, 2023
Units redeemed	5,500,000		2,560,000
Redemption price per unit, including accrued distributions	$	31.88	$	32.18
Redemption price, including accrued distributions	$	175,340	$	82,381
Accrued distributions	825		1,152
Net Redemption Price	$	174,515	$	81,229
Carrying value of units at notification date	$	152,467	$	71,210
Net Redemption Price	174,515		81,229
Loss to common limited partners attributable to redemption	$	(22,048)	$	(10,019)
Loss per common limited partner unit attributable to redemption	$	(0.20)	$	(0.09)

Schedule of Series D Preferred Units [Table Text Block]

Distribution information on our Series D Preferred Units is as follows:

Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148
June 15, 2022 - September 14, 2022	$	0.682	$	15,854
March 15, 2022 - June 14, 2022	$	0.682	$	15,854
December 15, 2021 - March 14, 2022	$	0.682	$	15,854

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

The following is a summary of our Series D Preferred Units issued and outstanding:

	Transaction Date	Price per Unit	Number of Units
Issuance	June 29, 2018	$25.38	15,760,441
Issuance	July 13, 2018	$25.38	7,486,209
Total units issued			23,246,650
Repurchase	November 22, 2022	$32.73	(6,900,000)
Units outstanding as of December 31, 2022			16,346,650
Redemption	June 30, 2023	$31.88	(5,500,000)
Units outstanding as of June 30, 2023			10,846,650

XML

PARTNERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2023

Distribution Made to Preferred Limited Partner [Line Items]

Schedule of Preferred Units

Information on our Series A, B and C Preferred Units is shown below:

Units	Units Issued and Outstanding as of June 30, 2023	Optional Redemption Date/Date When Distribution Rate Became Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	9,060,000	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	15,400,000	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	6,900,000	December 15, 2022	Three-month LIBOR plus 6.88%

Distribution information on our Series A, B and C Preferred Units is as follows:

	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)
June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010
June 15, 2022 - September 14, 2022	$	0.54808	$	4,966	$	0.47789	$	7,360	$	0.56250	$	3,881
March 15, 2022 - June 14, 2022	$	0.47817	$	4,332	$	0.47657	$	7,339	$	0.56250	$	3,881
December 15, 2021 - March 14, 2022	$	0.43606	$	3,951	$	0.47657	$	7,339	$	0.56250	$	3,881

Distributions Made to Limited Partner, by Distribution [Table Text Block]

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The balance of and changes in the components included in AOCI were as follows:

	Three Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of April 1	$	497	$	(33,865)	$	1,967	$	(31,401)	$	(40,932)	$	(35,957)	$	3,843	$	(73,046)
Other comprehensive income before reclassification adjustments	249		—		—		249		1,133		—		—		1,133
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(736)		(736)		—		—		(420)		(420)
Net loss on cash flow hedges reclassified into interest expense, net	—		505		—		505		—		521		—		521
Other	—		—		(10)		(10)		—		—		(6)		(6)
Other comprehensive income (loss)	249		505		(746)		8		40,779		521		(426)		40,874
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

	Six Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1	$	62	$	(34,380)	$	2,713	$	(31,605)	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)
Other comprehensive income before reclassification adjustments	684		—		—		684		1,962		—		—		1,962
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(1,473)		(1,473)		—		—		(840)		(840)
Net loss on cash flow hedges reclassified into interest expense, net	—		1,020		—		1,020		—		1,050		—		1,050
Other	—		—		(19)		(19)		—		—		(12)		(12)
Other comprehensive income (loss)	684		1,020		(1,492)		212		41,608		1,050		(852)		41,806
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

swaps.

XML

NET INCOME (LOSS) PER COMMON UNIT (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Schedule of Net Income (Loss) Per Common Unit

The following table details the calculation of basic and diluted net (loss) income per common unit:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Distributions to preferred limited partners	(32,126)		(31,523)		(64,859)		(62,615)
Distributions to common limited partners	(44,363)		(44,128)		(88,759)		(88,293)
Distribution equivalent rights to restricted units	(667)		(617)		(1,339)		(1,250)
Distributions in excess of income	$	(31,015)	$	(17,069)	$	(2,880)	$	(80,647)
Distributions to common limited partners	$	44,363	$	44,128	$	88,759	$	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)		(17,069)		(2,880)		(80,647)
Series D Preferred Unit accretion	(3,303)		(4,734)		(6,974)		(9,315)
Series D Preferred Unit redemption	(32,067)		—		(32,067)		—
Net (loss) income attributable to common units	$	(22,022)	$	22,325	$	46,838	$	(1,669)
Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201
Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	0.42	$	(0.02)

XML

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2023

Supplemental Cash Flow Information [Abstract]

Schedule of Changes in Current Assets and Liabilities [Table Text Block]

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	12,356	$	(21,262)
Inventories	4,920		1,439
Other current assets	(3,508)		705
Increase (decrease) in current liabilities:
Accounts payable	(2,427)		5,082
Accrued interest payable	869		567
Accrued liabilities	(8,300)		(14,448)
Taxes other than income tax	(2,125)		(3,023)
Changes in current assets and current liabilities	$	1,785	$	(30,940)

Schedule of Supplemental Cash Flow Information [Table Text Block]

Other supplemental cash flow information is as follows:

	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	110,195	$	95,112
Cash paid for income taxes, net of tax refunds received	$	2,842	$	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	$	82,372	$	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$	1,818	$	1,342

Schedule of Cash and Cash Equivalents [Table Text Block]

“Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows is included in the consolidated balance sheets as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Cash and cash equivalents	$	3,813	$	14,489
Other long-term assets, net	9,056		8,888
Cash, cash equivalents and restricted cash	$	12,869	$	23,377

XML

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Revenues:
Pipeline	$	206,701	$	200,565	$	419,884	$	389,248
Storage	78,209		88,783		158,866		176,704
Fuels marketing	93,426		140,809		193,453		274,069
Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020
Operating income:
Pipeline	$	107,804	$	100,953	$	227,662	$	196,705
Storage	21,213		31,207		43,979		16,232
Fuels marketing	6,510		6,631		13,076		13,175
Total segment operating income	135,527		138,791		284,717		226,112
Gain on sale of assets	—		—		41,075		—
General and administrative expenses	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total operating income	$	102,870	$	109,059	$	262,855	$	167,485

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

Total assets by reportable segment were as follows:

	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Pipeline	$	3,304,918	$	3,360,685
Storage	1,410,647		1,438,609
Fuels marketing	29,045		37,763
Total segment assets	4,744,610		4,837,057
Other partnership assets	145,805		136,629
Total consolidated assets	$	4,890,415	$	4,973,686

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments	3

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 Series D Preferred Units (Details) - Series D Preferred Limited Partner [Member] $ in Thousands	Jul. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares
Class of Stock [Line Items]
Series D Preferred Units redeemed, units | shares		5,500,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions | $ / shares		31.88
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions | $		$ 175,340
Subsequent Event [Member]
Class of Stock [Line Items]
Series D Preferred Units redeemed, units | shares	2,560,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions | $ / shares	32.18
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions | $	$ 82,381

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 3 - Debt ammendments (Details) $ in Millions	Jun. 30, 2023 USD ($)
Revolving Credit Agreement [Member] | Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000.0
Receivables Financing Agreement [Member] | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100.0

XML

DISPOSITIONS Narrative 1 - Sale Leaseback Transaction (Details) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 21, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Sale Leaseback Transaction [Line Items]
Cash sales price					$ 102,769	$ 59,531
Gain on Sale-Leaseback Transaction		$ 0		$ 0	$ 41,075	$ 0
Corporate headquarters facility and underlying land
Sale Leaseback Transaction [Line Items]
Number of acres of land sold	24
Cash sales price	$ 103,000
Initial term	20 years
Number of renewal periods	2
Renewal terms	10 years
Rent, annual increase rate			2.50%
Operating lease, reasonably certain lease term			20 years
Corporate headquarters facility and underlying land | Gain on sale of assets
Sale Leaseback Transaction [Line Items]
Gain on Sale-Leaseback Transaction			$ 41,100
Corporate headquarters facility and underlying land | April 1, 2023 - March 31, 2024
Sale Leaseback Transaction [Line Items]
Rent for initial term, starting rent for first year			$ 6,400

XML

DISPOSITIONS Table 1 - Sale Leaseback Transaction (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Sale Leaseback Transaction [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities
Corporate headquarters facility and underlying land
Sale Leaseback Transaction [Line Items]
Operating lease, right-of-use assets	$ 82,230
Operating lease, liabilities, current	710
Operating lease, liabilities, long-term	81,498
Operating lease, liabilities, total	$ 82,208

XML

DISPOSITIONS Narrative 2 Operating Lease Information (Details)	Mar. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Operating lease, weighted average discount rate, percent	6.10%

XML

DISPOSITIONS Narrative 3 - Point Tupper Terminal Disposition (Details) $ in Thousands, bbl in Millions		3 Months Ended			6 Months Ended
	Apr. 29, 2022 USD ($) bbl	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Segment Information
Proceeds from sale of business	$ 60,000
Foreign currency translation losses				$ 42,200
Impairment loss		$ 0	$ 0		$ 0	$ 46,122
Foreign currency translation losses released			39,600
Gain on sale			$ 1,600
Gain on sale, location on consolidated statement of comprehensive income (loss) [Extensible Enumeration]						Other income, net
Impairment loss
Segment Information
Impairment loss				$ 46,100
Storage Segment
Segment Information
Storage capacity sold (barrels) | bbl	7.8

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Contract assets
Total	$ 3,842	$ 2,671	$ 2,916	$ 2,840
Additions	3,782	2,112
Transfer to accounts receivable	(2,856)	(2,198)
Transfer to revenues, contract assets	0	(83)
Total activity	926	(169)
Contract liabilities
Total	(71,332)	(54,321)	(59,052)	(61,470)
Additions	(45,998)	(17,692)
Transfer to revenues, contract liabilities	33,718	24,841
Total activity	(12,280)	7,149
Prepaid and other current assets
Contract assets
Current portion	2,703	2,251	2,612	2,336
Accrued liabilities
Contract liabilities
Current portion	(27,379)	(13,555)	(17,647)	(15,443)
Other long-term assets, net
Contract assets
Noncurrent portion	1,139	420	304	504
Other long-term liabilities
Contract liabilities
Noncurrent portion	$ (43,953)	$ (40,766)	$ (41,405)	$ (46,027)

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1,141,643
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 204,812
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 337,666
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 229,535
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 163,771
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 81,059
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, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 124,800

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ (2)	$ 0	$ (2)	$ (1)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	206,701	200,565	419,884	389,248
Pipeline Segment | Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	93,186	94,010	189,789	180,134
Pipeline Segment | Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	113,515	106,555	230,095	209,114
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	66,888	78,018	136,219	155,178
Lessor revenues	11,321	10,765	22,647	21,526
Total revenues	78,209	88,783	158,866	176,704
Storage Segment | Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	23,839	30,929	51,154	57,370
Storage Segment | Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	43,049	47,089	85,065	97,808
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	93,426	140,809	193,453	274,069
Operating Segments, Net of Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	$ 378,334	$ 430,157	$ 772,201	$ 840,020

XML

DEBT Narrative 1 - Revolving Credit Agreement (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($)
Maximum [Member]
Debt Instrument [Line Items]
Maximum consolidated debt coverage ratio (as defined in the Revolving Credit Agreement)	5.00
Minimum [Member]
Debt Instrument [Line Items]
Minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement)	1.75
Revolving Credit Agreement [Member] | Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000,000
Line of credit facility, requirement, pro forma amount	150,000
Current remaining borrowing capacity	750,400
Long-term debt	245,000
Letters of credit outstanding, amount	$ 4,600
Line of credit facility, weighted-average interest rate	7.70%

XML

DEBT Narrative 2 - Receivables Financing Agreement (Details) - Receivables Financing Agreement [Member] - Secured Debt $ in Thousands	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100,000
Long-term debt	$ 71,200
Interest rate	6.70%
Debt instrument, collateral amount	$ 108,200

XML

DEBT Table - Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Fair value, long-term debt, excluding finance leases	$ 3,250,699	$ 3,169,664
Long-term debt, excluding finance leases	$ 3,260,205	$ 3,242,289

XML

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual, at carrying value	$ 1.3	$ 0.3

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 1 (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Interest expense, net
Temporary Equity [Line Items]
Series D Preferred Units, distributions on mandatorily redeemable units	$ 1,700	$ 1,700

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 1 - Unit redemptions (Details) $ / shares in Units, $ in Thousands					1 Months Ended	2 Months Ended	3 Months Ended								6 Months Ended
	Jul. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 29, 2023 USD ($) $ / shares	May 25, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Jul. 30, 2023 USD ($)	Sep. 14, 2023 USD ($)	Jun. 30, 2023 USD ($) $ / shares	Jun. 14, 2023 USD ($)	Mar. 14, 2023 USD ($)	Sep. 14, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 14, 2022 USD ($)	Mar. 14, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date		$ 230,264			$ 230,264			$ 230,264				$ 625,751			$ 230,264	$ 625,751	$ 450,641	$ 446,970	$ 621,018	$ 616,439
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption								$ (32,067)				0			$ (32,067)	0
Preferred Stock Redeemed June 30, 2023
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date				$ 152,467
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption				$ (22,048)
Loss per common limited partner unit attributable to redemption of Series D preferred units | $ / shares				$ (0.20)
Preferred Stock Redeemed July 31, 2023
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date			$ 71,210
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption			$ (10,019)
Loss per common limited partner unit attributable to redemption of Series D preferred units | $ / shares			$ (0.09)
Series D Preferred Limited Partner [Member]
Temporary Equity [Line Items]
Series D Preferred Units redeemed, units | shares		5,500,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions | $ / shares		31.88			31.88			31.88							31.88
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions		$ 175,340
Series D Preferred Units, accrued distributions								$ 10,014	$ 10,315	$ 11,148	$ 15,854	$ 15,854	$ 15,854	$ 15,854	$ 21,163	$ 31,708
Series D Preferred Limited Partner [Member] | Preferred Stock Redeemed June 30, 2023
Temporary Equity [Line Items]
Series D Preferred Units, accrued distributions					$ 825
Net Redemption Price		$ 174,515
Series D Preferred Limited Partner [Member] | Subsequent Event [Member]
Temporary Equity [Line Items]
Series D Preferred Units redeemed, units | shares	2,560,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions | $ / shares	32.18
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions	$ 82,381
Series D Preferred Units, accrued distributions							$ 7,598
Series D Preferred Limited Partner [Member] | Subsequent Event [Member] | Preferred Stock Redeemed July 31, 2023
Temporary Equity [Line Items]
Series D Preferred Units, accrued distributions						$ 1,152
Net Redemption Price	$ 81,229

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 2 - Distributions (Details) - Series D Preferred Limited Partner [Member] - $ / shares	3 Months Ended					6 Months Ended
	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 14, 2022	Mar. 14, 2022	Jun. 30, 2023
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners	$ 0.682	$ 0.682	$ 0.682	$ 0.682	$ 0.682
Series D preferred units, required amount of per unit cash dividends to permit dividend paid in kind						$ 0.635
Preferred Stock, Distributions, Period - June 29, 2018 to June 14, 2020 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						9.75%
Cash distributions per unit applicable to limited partners						$ 0.619
Preferred Stock, Distributions, Period - June 15, 2020 to June 14, 2023
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						10.75%
Cash distributions per unit applicable to limited partners						$ 0.682
Minimum [Member] | Preferred Stock, Distributions, Period - June 15, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						13.75%
Cash distributions per unit applicable to limited partners						$ 0.872

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 2 - Distributions (Details) - Series D Preferred Limited Partner [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended
	Sep. 14, 2023	Jun. 30, 2023	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 30, 2022	Jun. 14, 2022	Mar. 14, 2022	Jun. 30, 2023	Jun. 30, 2022
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners			$ 0.682	$ 0.682	$ 0.682		$ 0.682	$ 0.682
Series D Preferred Units, accrued distributions		$ 10,014	$ 10,315	$ 11,148	$ 15,854	$ 15,854	$ 15,854	$ 15,854	$ 21,163	$ 31,708
Preferred Stock, Distributions, Period - June 15, 2023 and thereafter [Member] | Minimum [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum									13.75%
Cash distributions per unit applicable to limited partners									$ 0.872
Subsequent Event [Member]
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners	$ 0.872
Series D Preferred Units, accrued distributions	$ 7,598

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 3 - Issued and Outstanding (Details)	Jun. 30, 2023 $ / shares shares	Nov. 22, 2022 $ / shares shares	Dec. 31, 2022 shares	Jul. 14, 2018 shares	Jul. 13, 2018 $ / shares shares	Jun. 29, 2018 $ / shares shares
Class of Stock [Line Items]
Series D preferred units issued, price per unit | $ / shares					$ 25.38	$ 25.38
Series D preferred units repurchased, price per unit | $ / shares		32.73
Series D preferred units issued				23,246,650	7,486,209	15,760,441
Series D preferred units repurchased		(6,900,000)
Series D preferred units outstanding	8,286,650		16,346,650
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Series D preferred units redeemed, redemption price per unit, including accrued distributions | $ / shares	31.88
Series D Preferred Units redeemed, units	(5,500,000)
Preferred units outstanding	10,846,650

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 3 (Details) - shares	Jul. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Series D preferred units outstanding		8,286,650	16,346,650
Subsequent Event [Member]
Class of Stock [Line Items]
Series D preferred units outstanding	8,286,650
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units outstanding		10,846,650
Mandatorily Redeemable Preferred Stock | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units outstanding		2,560,000

XML

PARTNERS' EQUITY Narrative 1 (Details)	6 Months Ended
	Jun. 30, 2023
Series A Preferred Limited Partner [Member] | November 25, 2016 - December 14, 2021
Class of Stock [Line Items]
Preferred units distribution percentage	8.50%
Series B Preferred Limited Partner [Member] | April 28, 2017 - June 14, 2022
Class of Stock [Line Items]
Preferred units distribution percentage	7.625%
Series C Preferred Limited Partner [Member] | November 30, 2017 - December 14, 2022
Class of Stock [Line Items]
Preferred units distribution percentage	9.00%

XML

PARTNERS' EQUITY Table 1 - Cash Distributions - Preferred Units (Details) - $ / shares				6 Months Ended
	Nov. 30, 2017	Apr. 28, 2017	Nov. 25, 2016	Jun. 30, 2023	Dec. 31, 2022
Series A Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued			9,060,000
Preferred units outstanding				9,060,000	9,060,000
Series A Preferred Limited Partner [Member] | December 15, 2021 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series A Preferred Limited Partner [Member] | December 15, 2021 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				6.766%
Series B Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued		15,400,000
Preferred units outstanding				15,400,000	15,400,000
Series B Preferred Limited Partner [Member] | June 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series B Preferred Limited Partner [Member] | June 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				5.643%
Series C Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued	6,900,000
Preferred units outstanding				6,900,000	6,900,000
Series C Preferred Limited Partner [Member] | December 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series C Preferred Limited Partner [Member] | December 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				6.88%

XML

PARTNERS' EQUITY Table 2 - Cash Distributions - Preferred Units - Floating Distribution Rate (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 14, 2023	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 14, 2022	Mar. 14, 2022
Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.73169	$ 0.71889	$ 0.54808	$ 0.47817	$ 0.43606
Series D Preferred Units, accrued distributions		$ 6,629	$ 6,513	$ 4,966	$ 4,332	$ 3,951
Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.66150	$ 0.64871	$ 0.47789
Series D Preferred Units, accrued distributions		$ 10,187	$ 9,990	$ 7,360
Preferred unit distribution, per unit					$ 0.47657	$ 0.47657
Distributions to partners, fixed					$ 7,339	$ 7,339
Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.73881	$ 0.72602
Series D Preferred Units, accrued distributions		$ 5,098	$ 5,010
Preferred unit distribution, per unit				$ 0.56250	$ 0.56250	$ 0.56250
Distributions to partners, fixed				$ 3,881	$ 3,881	$ 3,881
Subsequent Event [Member] | Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.76715
Series D Preferred Units, accrued distributions	$ 6,950
Subsequent Event [Member] | Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.69696
Series D Preferred Units, accrued distributions	$ 10,733
Subsequent Event [Member] | Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.77428
Series D Preferred Units, accrued distributions	$ 5,343

XML

PARTNERS' EQUITY Narrative 2 (Details)	6 Months Ended
	Jun. 30, 2023
Partners' Capital Notes [Abstract]
Percent of available cash distributed	100.00%
Number of days after each quarter-end within which distribution is declared and paid to common unitholders	45

XML

PARTNERS' EQUITY Table 3 - Cash Distributions - Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Partners' Capital Notes [Abstract]
Common limited partners' distribution, per unit	$ 0.40	$ 0.40	$ 0.40
Common limited partners' distribution	$ 44,363	$ 44,396	$ 44,328	$ 44,128	$ 88,759	$ 88,293

XML

PARTNERS' EQUITY Table 4 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (31,605)
Ending balance	$ (31,393)		(31,393)
Loss to be reclassified during next 12 months, forward-starting interest rate swaps	(3,300)		(3,300)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	497	$ (40,932)	62	$ (41,761)
Other comprehensive income before reclassification adjustments	249	1,133	684	1,962
Other	0	0	0	0
Other comprehensive income (loss)	249	40,779	684	41,608
Ending balance	746	(153)	746	(153)
Foreign Currency Translation [Member] | Point Tupper Terminal Disposition
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0	39,646	0	39,646
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(33,865)	(35,957)	(34,380)	(36,486)
Other comprehensive income before reclassification adjustments	0	0	0	0
Other	0	0	0	0
Other comprehensive income (loss)	505	521	1,020	1,050
Ending balance	(33,360)	(35,436)	(33,360)	(35,436)
Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,967	3,843	2,713	4,269
Other comprehensive income before reclassification adjustments	0	0	0	0
Other	(10)	(6)	(19)	(12)
Other comprehensive income (loss)	(746)	(426)	(1,492)	(852)
Ending balance	1,221	3,417	1,221	3,417
Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(31,401)	(73,046)	(31,605)	(73,978)
Other comprehensive income before reclassification adjustments	249	1,133	684	1,962
Other	(10)	(6)	(19)	(12)
Other comprehensive income (loss)	8	40,874	212	41,806
Ending balance	(31,393)	(32,172)	(31,393)	(32,172)
Total [Member] | Point Tupper Terminal Disposition
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0	39,646	0	39,646
Other income, net | Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI			(1,473)	(840)
Other income, net | Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI			(1,473)	(840)
Interest expense, net | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	505	521	1,020	1,050
Interest expense, net | Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	505	521	$ 1,020	$ 1,050
Pension Plan [Member] | Other income, net | Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(736)	(420)
Pension Plan [Member] | Other income, net | Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	$ (736)	$ (420)

XML

NET INCOME (LOSS) PER COMMON UNIT Table - Net Income (Loss) per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income (loss)	$ 46,141			$ 59,199	$ 152,077	$ 71,511
Distributions to preferred limited partners	(32,126)			(31,523)	(64,859)	(62,615)
Distributions to common limited partners	(44,363)	$ (44,396)	$ (44,328)	(44,128)	(88,759)	(88,293)
Distribution equivalent rights to restricted units	(667)			(617)	(1,339)	(1,250)
Distributions in excess of income	(31,015)			(17,069)	(2,880)	(80,647)
Distributions to common limited partners	44,363	$ 44,396	$ 44,328	44,128	88,759	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)			(17,069)	(2,880)	(80,647)
Series D Preferred Unit accretion	(3,303)			(4,734)	(6,974)	(9,315)
Series D Preferred Unit redemption	(32,067)			0	(32,067)	0
Net (loss) income attributable to common units	$ (22,022)			$ 22,325	$ 46,838	$ (1,669)
Basic weighted-average common units outstanding	110,905,471			110,306,641	110,893,293	110,242,201
Diluted weighted-average common units outstanding	110,905,471			110,306,641	110,893,293	110,242,201
Basic net income (loss) per common unit	$ (0.20)			$ 0.20	$ 0.42	$ (0.02)
Diluted net income (loss) per common unit	$ (0.20)			$ 0.20	$ 0.42	$ (0.02)

XML

SUPPLEMENTAL CASH FLOW INFORMATION - Table 1 - Changes in Current Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Decrease (increase) in accounts receivable	$ 12,356	$ (21,262)
Decrease (increase) in inventories	4,920	1,439
Decrease (increase) in other currrent assets	(3,508)	705
Increase (decrease) in accounts payable	(2,427)	5,082
Increase (decrease) in accrued interest payable	869	567
Increase (decrease) in accrued liabilities	(8,300)	(14,448)
Increase (decrease) in taxes other than income tax	(2,125)	(3,023)
Changes in current assets and current liabilities	$ 1,785	$ (30,940)

XML

SUPPLEMENTAL CASH FLOW INFORMATION - Table 2 - Other Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amount capitalized	$ 110,195	$ 95,112
Cash paid for income taxes, net of tax refunds received	2,842	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	82,372	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$ 1,818	$ 1,342

XML

SUPPLEMENTAL CASH FLOW INFORMATION - Table 3 - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 3,813	$ 14,489
Restricted cash	9,056	8,888
Cash, cash equivalents and restricted cash	$ 12,869	$ 23,377	$ 13,145	$ 14,439
Restricted cash, location on consolidated balance sheets [Extensible Enumeration]	Other long-term assets, net	Other long-term assets, net

XML

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating income:
Gain on sale of assets	$ 0	$ 0	$ 41,075	$ 0
General and administrative expenses	31,620	27,909	60,345	54,980
Other depreciation and amortization expense	1,037	1,823	2,592	3,647
Operating income (loss)	102,870	109,059	262,855	167,485
Storage Segment
Revenues:
Total revenues	78,209	88,783	158,866	176,704
Operating Segments, Net of Intersegment Eliminations
Revenues:
Total revenues	378,334	430,157	772,201	840,020
Total segment
Operating income:
Operating income (loss)	135,527	138,791	284,717	226,112
Total segment | Pipeline Segment
Revenues:
Total revenues	206,701	200,565	419,884	389,248
Operating income:
Operating income (loss)	107,804	100,953	227,662	196,705
Total segment | Storage Segment
Revenues:
Total revenues	78,209	88,783	158,866	176,704
Operating income:
Operating income (loss)	21,213	31,207	43,979	16,232
Total segment | Fuels Marketing Segment
Revenues:
Total revenues	93,426	140,809	193,453	274,069
Operating income:
Operating income (loss)	6,510	6,631	13,076	13,175
Intersegment Eliminations [Member]
Revenues:
Total revenues	$ (2)	$ 0	$ (2)	$ (1)

XML

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Information
Total assets	$ 4,890,415	$ 4,973,686
Total segment assets
Segment Information
Total assets	4,744,610	4,837,057
Total segment assets | Pipeline Segment
Segment Information
Total assets	3,304,918	3,360,685
Total segment assets | Storage Segment
Segment Information
Total assets	1,410,647	1,438,609
Total segment assets | Fuels Marketing Segment
Segment Information
Total assets	29,045	37,763
Other partnership assets
Segment Information
Total assets	$ 145,805	$ 136,629