10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2022

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 1-03480

MDU RESOURCES GROUP INC

(Exact name of registrant as specified in its charter)

Delaware	30-1133956
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1200 West Century Avenue

P.O. Box 5650

Bismarck, North Dakota 58506-5650

(Address of principal executive offices)

(Zip Code)

(701) 530-1000

(Registrant's telephone number, including area code)

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 Stock, par value $1.00 per share	MDU	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 ☒ No ☐.

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

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

Large Accelerated Filer	☒	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. ☐

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

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of October 27, 2022: 203,350,740 shares.

1

Index
	Page
Definitions	3
Introduction	5
Part I -- Financial Information
Item 1. Financial Statements	6
Consolidated Statements of Income -- Three and Nine Months Ended September 30, 2022 and 2021	6
Consolidated Statements of Comprehensive Income -- Three and Nine Months Ended September 30, 2022 and 2021	7
Consolidated Balance Sheets -- September 30, 2022 and 2021, and December 31, 2021	8
Consolidated Statements of Equity -- Nine Months Ended September 30, 2022 and 2021	9
Consolidated Statements of Cash Flows -- Nine Months Ended September 30, 2022 and 2021	11
Notes to Consolidated Financial Statements	12
1. Basis of presentation	12
2. New accounting standards	13
3. Seasonality of operations	13
4. Receivables and allowance for expected credit losses	13
5. Inventories and natural gas in storage	14
6. Earnings per share	15
7. Equity	15
8. Accumulated other comprehensive loss	16
9. Revenue from contracts with customers	17
10. Business combinations	20
11. Leases	20
12. Goodwill and other intangible assets	21
13. Regulatory assets and liabilities	22
14. Fair value measurements	23
15. Debt	25
16. Cash flow information	26
17. Business segment data	27
18. Employee benefit plans	29
19. Regulatory matters	29
20. Contingencies	31
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	33
Item 3. Quantitative and Qualitative Disclosures About Market Risk	56
Item 4. Controls and Procedures	56
Part II -- Other Information
Item 1. Legal Proceedings	57
Item 1A. Risk Factors	57
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	58
Item 4. Mine Safety Disclosures	58
Item 5. Other Information	58
Item 6. Exhibits	58
Exhibits Index	59
Signatures	60

2

Definitions

The following abbreviations and acronyms used in this Form 10-Q are defined below:

Abbreviation or Acronym
2021 Annual Report	Company's Annual Report on Form 10-K for the year ended December 31, 2021
AFUDC	Allowance for funds used during construction
ASC	FASB Accounting Standards Codification
ASU	FASB Accounting Standards Update
Cascade	Cascade Natural Gas Corporation, an indirect wholly owned subsidiary of MDU Energy Capital
Centennial	Centennial Energy Holdings, Inc., a direct wholly owned subsidiary of the Company
Centennial Capital	Centennial Holdings Capital LLC, a direct wholly owned subsidiary of Centennial
Coincident Load Factor	The discount from peak requirements when the Company's peak is at a time different from the MISO system peak for the winter season.
Company	MDU Resources Group, Inc.
COVID-19	Coronavirus disease 2019. In March 2020, the World Health Organization declared the COVID-19 outbreak a pandemic and the President of the United States declared the COVID-19 outbreak a national emergency.
Coyote Creek	Coyote Creek Mining Company, LLC, a subsidiary of The North American Coal Corporation
Coyote Station	427-MW coal-fired electric generating facility near Beulah, North Dakota (25 percent ownership)
Diamond Willow	Diamond Willow Wind Farm located in Montana
dk	Decatherm
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
EPA	United States Environmental Protection Agency
Exchange Act	Securities Exchange Act of 1934, as amended
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
Federal Reserve	Federal Reserve System, the central banking system of the United States.
Fidelity	Fidelity Exploration & Production Company, a direct wholly owned subsidiary of WBI Holdings (previously referred to as the Company's exploration and production segment)
GAAP	Accounting principles generally accepted in the United States of America
GHG	Greenhouse gas
Great Plains	Great Plains Natural Gas Co., a public utility division of Montana-Dakota
Intermountain	Intermountain Gas Company, an indirect wholly owned subsidiary of MDU Energy Capital
IRA	Inflation Reduction Act of 2022
IRS	Internal Revenue Service
Knife River	Knife River Corporation, a direct wholly owned subsidiary of Centennial
kWh	Kilowatt-hour
kV	Kilovolt
LIBOR	London Inter-bank Offered Rate
MDU Construction Services	MDU Construction Services Group, Inc., a direct wholly owned subsidiary of Centennial
MDU Energy Capital	MDU Energy Capital, LLC, a direct wholly owned subsidiary of the Company
MISO	Midcontinent Independent System Operator, Inc., the organization that provides open-access transmission services and monitors the high-voltage transmission system in the Midwest United States and Manitoba, Canada and a southern United States region which includes much of Arkansas, Mississippi, and Louisiana.
MMcf	Million cubic feet
MMdk	Million dk
MNPUC	Minnesota Public Utilities Commission

3

Montana-Dakota	Montana-Dakota Utilities Co., a direct wholly owned subsidiary of MDU Energy Capital
MW	Megawatt
NDDEQ	North Dakota Department of Environmental Quality
NDPSC	North Dakota Public Service Commission
NERC	North American Electric Reliability Corporation
Oil	Includes crude oil and condensate
PHMSA	Pipeline and Hazardous Materials Safety Administration
Regional Haze Rule	The EPA developed the Regional Haze Rule requiring states to develop and implement comprehensive plans to reduce human-caused regional haze in designated areas such as national parks and wilderness areas.
SDPUC	South Dakota Public Utilities Commission
SEC	United States Securities and Exchange Commission
SOFR	Secured Overnight Financing Rate
VIE	Variable interest entity
Washington DOE	Washington State Department of Ecology
WBI Energy	WBI Energy, Inc., an indirect wholly owned subsidiary of WBI Holdings
WBI Holdings	WBI Holdings, Inc., a direct wholly owned subsidiary of Centennial
WUTC	Washington Utilities and Transportation Commission

4

Introduction

The Company's mission is to deliver superior value to stakeholders by providing essential infrastructure and services to America. The Company generates, transmits and distributes electricity and provides natural gas distribution, transportation and storage services that are regulated by state public service commissions and/or the FERC. The Company also provides construction services to a variety of industries, including commercial, industrial and utility customers, and provides construction materials through aggregate mining and marketing of related products, such as ready-mix concrete, asphalt and asphalt oil.

Montana-Dakota was incorporated under the state laws of Delaware in 1924. The Company was incorporated under the state laws of Delaware in 2018 upon the completion of an internal holding company reorganization, which resulted in Montana-Dakota becoming a subsidiary of the Company. Its principal executive offices are located at 1200 West Century Avenue, P.O. Box 5650, Bismarck, North Dakota 58506-5650, telephone (701) 530-1000.

On August 4, 2022, the Company announced its Board of Directors unanimously approved a plan to pursue the separation of Knife River from the Company. The separation is planned as a tax-free spinoff transaction to the Company’s stockholders for U.S. federal income tax purposes. The separation is expected to result in two independent, publicly traded companies: (1) MDU Resources Group, Inc., the existing company and (2) Knife River, a construction materials and contracting company.

As the next step of the Company’s strategic planning, the Board of Directors has unanimously determined the best way to optimize value would be to create two pure-play companies: a leading construction materials company and a regulated energy delivery company. Accordingly, the board has authorized management to commence a strategic review process for MDU Construction Services with the objective of achieving the board’s goal of creating two pure-play public companies. For more information on the Company's risks associated with the anticipated separation or the proposed future structure of the companies, see Item 1A. Risk Factors.

The Company is organized into five reportable business segments. These business segments include: electric, natural gas distribution, pipeline, construction materials and contracting, and construction services. The Company's business segments are determined based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these segments is defined based on the reporting and review process used by the Company's chief executive officer.

The Company, through its wholly owned subsidiary, MDU Energy Capital, owns Montana-Dakota, Cascade and Intermountain. The electric segment is comprised of Montana-Dakota while the natural gas distribution segment is comprised of Montana-Dakota, Cascade and Intermountain.

The Company, through its wholly owned subsidiary, Centennial, owns WBI Energy, Knife River, MDU Construction Services and Centennial Capital. WBI Energy is the pipeline segment, Knife River is the construction materials and contracting segment, MDU Construction Services is the construction services segment and Centennial Capital is reflected in the Other category.

For more information on the Company's business segments, see Note 17 of the Notes to Consolidated Financial Statements.

5

Part I -- Financial Information

Item 1. Financial Statements

MDU Resources Group, Inc.
Consolidated Statements of Income
(Unaudited)
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands, except per share amounts)
Operating revenues:
Electric, natural gas distribution and regulated pipeline	$	263,614	$	237,065	$	1,140,528	$	940,017
Non-regulated pipeline, construction materials and contracting, construction services and other	1,713,592		1,348,948		3,974,158		3,297,591
Total operating revenues	1,977,206		1,586,013		5,114,686		4,237,608
Operating expenses:
Operation and maintenance:
Electric, natural gas distribution and regulated pipeline	89,502		90,058		281,430		273,796
Non-regulated pipeline, construction materials and contracting, construction services and other	1,457,350		1,122,840		3,490,120		2,828,557
Total operation and maintenance	1,546,852		1,212,898		3,771,550		3,102,353
Purchased natural gas sold	61,863		41,135		444,527		280,584
Depreciation, depletion and amortization	82,293		75,229		247,173		222,613
Taxes, other than income	56,267		48,096		185,303		163,819
Electric fuel and purchased power	20,080		19,486		68,370		56,216
Total operating expenses	1,767,355		1,396,844		4,716,923		3,825,585
Operating income	209,851		189,169		397,763		412,023
Other income (expense)	4,769		5,930		(1,877)		18,310
Interest expense	31,369		23,389		84,741		70,224
Income before income taxes	183,251		171,710		311,145		360,109
Income taxes	35,318		32,748		60,847		68,860
Income from continuing operations	147,933		138,962		250,298		291,249
Discontinued operations, net of tax	38		314		103		348
Net income	$	147,971	$	139,276	$	250,401	$	291,597
Earnings per share - basic:
Income from continuing operations	$	.73	$	.68	$	1.23	$	1.44
Discontinued operations, net of tax	—		—		—		—
Earnings per share - basic	$	.73	$	.68	$	1.23	$	1.44
Earnings per share - diluted:
Income from continuing operations	$	.73	$	.68	$	1.23	$	1.44
Discontinued operations, net of tax	—		—		—		—
Earnings per share - diluted	$	.73	$	.68	$	1.23	$	1.44
Weighted average common shares outstanding - basic	203,351		202,863		203,351		201,647
Weighted average common shares outstanding - diluted	203,644		203,190		203,407		201,955

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

6

MDU Resources Group, Inc.
Consolidated Statements of Comprehensive Income
(Unaudited)
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Net income	$	147,971	$	139,276	$	250,401	$	291,597
Other comprehensive income (loss):
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $37 and $36 for the three months ended and $109 and $109 for the nine months ended in 2022 and 2021, respectively	111		111		334		334
Postretirement liability adjustment:
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $148 and $151 for the three months ended and $460 and $462 for the nine months ended in 2022 and 2021, respectively	461		466		1,367		1,389
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $— and $— for the three months ended and $(1,086) and $— for the nine months ended in 2022 and 2021, respectively	—		—		(3,265)		—
Postretirement liability adjustment	461		466		(1,898)		1,389
Net unrealized loss on available-for-sale investments:
Net unrealized loss on available-for-sale investments arising during the period, net of tax of $(88) and $(15) for the three months ended and $(207) and $(40) for the nine months ended in 2022 and 2021, respectively	(329)		(54)		(777)		(150)
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $12 and $6 for the three months ended and $27 and $21 for the nine months ended in 2022 and 2021, respectively	42		20		99		80
Net unrealized loss on available-for-sale investments	(287)		(34)		(678)		(70)
Other comprehensive income (loss)	285		543		(2,242)		1,653
Comprehensive income attributable to common stockholders	$	148,256	$	139,819	$	248,159	$	293,250

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

7

MDU Resources Group, Inc.
Consolidated Balance Sheets
(Unaudited)
	September 30, 2022		September 30, 2021		December 31, 2021
Assets	(In thousands, except shares and per share amounts)
Current assets:
Cash and cash equivalents	$	74,620	$	57,241	$	54,161
Receivables, net	1,298,019		979,862		946,741
Inventories	398,642		312,285		335,609
Current regulatory assets	148,160		133,135		118,691
Prepayments and other current assets	104,850		83,364		95,741
Total current assets	2,024,291		1,565,887		1,550,943
Noncurrent assets:
Property, plant and equipment	9,257,067		8,634,737		8,972,849
Less accumulated depreciation, depletion and amortization	3,263,217		3,175,756		3,216,461
Net property, plant and equipment	5,993,850		5,458,981		5,756,388
Goodwill	763,262		717,646		765,386
Other intangible assets, net	18,745		22,241		22,578
Regulatory assets	344,442		379,245		357,851
Investments	157,860		171,859		175,476
Operating lease right-of-use assets	119,586		109,439		124,138
Other	185,094		143,565		157,675
Total noncurrent assets	7,582,839		7,002,976		7,359,492
Total assets	$	9,607,130	$	8,568,863	$	8,910,435
Liabilities and Stockholders' Equity
Current liabilities:
Short-term borrowings	$	100,000	$	50,000	$	—
Long-term debt due within one year	214,453		1,548		148,053
Accounts payable	630,699		525,704		478,933
Taxes payable	93,565		87,455		80,372
Dividends payable	44,229		43,212		44,229
Accrued compensation	99,824		105,867		81,904
Operating lease liabilities due within one year	34,569		30,502		35,368
Regulatory liabilities due within one year	18,599		16,491		16,303
Other accrued liabilities	232,364		212,140		207,078
Total current liabilities	1,468,302		1,072,919		1,092,240
Noncurrent liabilities:
Long-term debt	2,773,999		2,326,718		2,593,847
Deferred income taxes	617,996		557,582		591,962
Asset retirement obligations	472,931		455,522		458,061
Regulatory liabilities	433,212		426,141		428,790
Operating lease liabilities	85,884		79,397		89,253
Other	262,948		318,306		273,408
Total noncurrent liabilities	4,646,970		4,163,666		4,435,321
Commitments and contingencies
Stockholders' equity:
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,889,661 at September 30, 2022, 203,889,661 at September 30, 2021 and 203,889,661 at December 31, 2021	203,889		203,889		203,889
Other paid-in capital	1,455,241		1,458,208		1,461,205
Retained earnings	1,879,600		1,720,232		1,762,410
Accumulated other comprehensive loss	(43,246)		(46,425)		(41,004)
Treasury stock at cost - 538,921 shares	(3,626)		(3,626)		(3,626)
Total stockholders' equity	3,491,858		3,332,278		3,382,874
Total liabilities and stockholders' equity	$	9,607,130	$	8,568,863	$	8,910,435

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

8

MDU Resources Group, Inc.
Consolidated Statements of Equity
(Unaudited)
				Other Paid-in Capital		Retained Earnings		Accumu-lated Other Compre-hensive Loss
	Common Stock									Treasury Stock
	Shares	Amount								Shares	Amount		Total
	(In thousands, except shares)
At December 31, 2021	203,889,661	$	203,889	$	1,461,205	$	1,762,410	$	(41,004)	(538,921)	$	(3,626)	$	3,382,874
Net income	—	—		—		31,763		—		—	—		31,763
Other comprehensive income	—	—		—		—		269		—	—		269
Dividends declared on common stock	—	—		—		(44,447)		—		—	—		(44,447)
Stock-based compensation	—	—		2,689		—		—		—	—		2,689
Repurchase of common stock	—	—		—		—		—		(266,821)	(7,399)		(7,399)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	—	—		(12,303)		—		—		266,821	7,399		(4,904)
Issuance of common stock	—	—		(127)		—		—		—	—		(127)
At March 31, 2022	203,889,661	$	203,889	$	1,451,464	$	1,749,726	$	(40,735)	(538,921)	$	(3,626)	$	3,360,718
Net income	—	—		—		70,667		—		—	—		70,667
Other comprehensive loss	—	—		—		—		(2,796)		—	—		(2,796)
Dividends declared on common stock	—	—		—		(44,446)		—		—	—		(44,446)
Stock-based compensation	—	—		2,689		—		—		—	—		2,689
Issuance of common stock	—	—		(22)		—		—		—	—		(22)
At June 30, 2022	203,889,661	$	203,889	$	1,454,131	$	1,775,947	$	(43,531)	(538,921)	$	(3,626)	$	3,386,810
Net income	—	—		—		147,971		—		—	—		147,971
Other comprehensive income	—	—		—		—		285		—	—		285
Dividends declared on common stock	—	—		—		(44,318)		—		—	—		(44,318)
Stock-based compensation	—	—		1,110		—		—		—	—		1,110
At September 30, 2022	203,889,661	$	203,889	$	1,455,241	$	1,879,600	$	(43,246)	(538,921)	$	(3,626)	$	3,491,858

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

9

MDU Resources Group, Inc.
Consolidated Statements of Equity
(Unaudited)
				Other Paid-in Capital		Retained Earnings		Accumu-lated Other Compre-hensive Loss
	Common Stock									Treasury Stock
	Shares	Amount								Shares	Amount		Total
	(In thousands, except shares)
At December 31, 2020	201,061,198	$	201,061	$	1,371,385	$	1,558,363	$	(48,078)	(538,921)	$	(3,626)	$	3,079,105
Net income	—	—		—		52,131		—		—	—		52,131
Other comprehensive income	—	—		—		—		568		—	—		568
Dividends declared on common stock	—	—		—		(42,943)		—		—	—		(42,943)
Stock-based compensation	—	—		2,574		—		—		—	—		2,574
Repurchase of common stock	—	—		—		—		—		(392,294)	(6,701)		(6,701)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	—	—		(10,828)		—		—		392,294	6,701		(4,127)
Issuance of common stock	672,260	672		19,027		—		—		—	—		19,699
At March 31, 2021	201,733,458	$	201,733	$	1,382,158	$	1,567,551	$	(47,510)	(538,921)	$	(3,626)	$	3,100,306
Net income	—	—		—		100,190		—		—	—		100,190
Other comprehensive income	—	—		—		—		542		—	—		542
Dividends declared on common stock	—	—		—		(43,336)		—		—	—		(43,336)
Stock-based compensation	—	—		6,150		—		—		—	—		6,150
Issuance of common stock	1,088,843	1,089		33,861		—		—		—	—		34,950
At June 30, 2021	202,822,301	$	202,822	$	1,422,169	$	1,624,405	$	(46,968)	(538,921)	$	(3,626)	$	3,198,802
Net income	—	—		—		139,276		—		—	—		139,276
Other comprehensive income	—	—		—		—		543		—	—		543
Dividends declared on common stock	—	—		—		(43,449)		—		—	—		(43,449)
Stock-based compensation	—	—		2,925		—		—		—	—		2,925
Issuance of common stock	1,067,360	1,067		33,114		—		—		—	—		34,181
At September 30, 2021	203,889,661	$	203,889	$	1,458,208	$	1,720,232	$	(46,425)	(538,921)	$	(3,626)	$	3,332,278

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

10

MDU Resources Group, Inc.
Consolidated Statements of Cash Flows
(Unaudited)
	Nine Months Ended
	September 30,
	2022		2021
	(In thousands)
Operating activities:
Net income	$	250,401	$	291,597
Discontinued operations, net of tax	103		348
Income from continuing operations	250,298		291,249
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	247,173		222,613
Deferred income taxes	18,741		30,353
Provision for credit losses	3,258		(801)
Amortization of debt issuance costs	1,080		997
Employee stock-based compensation costs	6,488		11,649
Pension and postretirement benefit plan net periodic benefit credit	(4,515)		(3,690)
Unrealized (gains) losses on investments	15,529		(4,408)
Gains on sales of assets	(8,500)		(10,518)
Changes in current assets and liabilities, net of acquisitions:
Receivables	(346,879)		(103,637)
Inventories	(60,670)		(21,402)
Other current assets	(31,405)		(74,413)
Accounts payable	148,456		33,173
Other current liabilities	62,106		14,175
Pension and postretirement benefit plan contributions	(375)		(326)
Other noncurrent changes	(15,835)		(19,129)
Net cash provided by continuing operations	284,950		365,885
Net cash used in discontinued operations	(17)		(75)
Net cash provided by operating activities	284,933		365,810
Investing activities:
Capital expenditures	(463,002)		(428,114)
Acquisitions, net of cash acquired	450		(13,721)
Net proceeds from sale or disposition of property and other	1,615		12,954
Investments	(4,411)		(3,777)
Net cash used in investing activities	(465,348)		(432,658)
Financing activities:
Issuance of short-term borrowings	100,000		50,000
Repayment of short-term borrowings	—		(50,000)
Issuance of long-term debt	270,250		178,879
Repayment of long-term debt	(23,155)		(63,835)
Debt issuance costs	(1,082)		(362)
Net proceeds from issuance of common stock	(149)		88,830
Dividends paid	(132,687)		(128,142)
Repurchase of common stock	(7,399)		(6,701)
Tax withholding on stock-based compensation	(4,904)		(4,127)
Net cash provided by financing activities	200,874		64,542
Increase (decrease) in cash and cash equivalents	20,459		(2,306)
Cash and cash equivalents -- beginning of year	54,161		59,547
Cash and cash equivalents -- end of period	$	74,620	$	57,241

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

11

MDU Resources Group, Inc.

Notes to Consolidated

Financial Statements

September 30, 2022 and 2021

(Unaudited)

Note 1 - Basis of presentation

The accompanying consolidated interim financial statements were prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Interim financial statements do not include all disclosures provided in annual financial statements and, accordingly, these financial statements should be read in conjunction with those appearing in the 2021 Annual Report. The information is unaudited but includes all adjustments that are, in the opinion of management, necessary for a fair presentation of the accompanying consolidated interim financial statements and are of a normal recurring nature. Depreciation, depletion and amortization expense is reported separately on the Consolidated Statements of Income and therefore is excluded from the other line items within operating expenses.

On August 4, 2022, the Company announced its Board of Directors unanimously approved a plan to pursue the separation of Knife River from the Company. The separation is planned as a tax-free spinoff transaction to the Company’s stockholders for U.S. federal income tax purposes. As the next step of the Company’s strategic planning, on November 2, 2022, the board of directors unanimously determined the best way to optimize value would be to create two pure-play companies: a leading construction materials company and a regulated energy delivery company. Accordingly, the board has authorized management to commence a strategic review process for MDU Construction Services with the objective of achieving the board’s goal of creating two pure-play public companies.

Discontinued operations include the supporting activities of Fidelity and are shown in income from discontinued operations on the Consolidated Statements of Income. Unless otherwise indicated, the amounts presented in the accompanying notes to the consolidated financial statements relate to the Company's continuing operations.

In the fourth quarter of 2021, the Company made changes to the presentation of the Consolidated Statements of Cash Flows to provide further clarity on the sources and uses of net cash provided by operating activities and net cash provided by (used in) financing activities. Certain prior period amounts have been reclassified to conform to the current year presentation. These reclassifications did not impact total net cash provided by operating activities or net cash provided by financing activities for the nine months ended September 30, 2021.

Management has also evaluated the impact of events occurring after September 30, 2022, up to the date of the issuance of these consolidated interim financial statements on November 3, 2022, that would require recognition or disclosure in the Consolidated Financial Statements.

12

Note 2 - New accounting standards

The following table provides a brief description of the accounting pronouncements applicable to the Company and the potential impact on its Consolidated Financial Statements and/or disclosures:

Standard	Description	Effective date	Impact on financial statements/disclosures
ASU 2021-10 - Government Assistance	In November 2021, the FASB issued guidance on modifying the disclosure requirements to increase the transparency of government assistance including disclosure of the types of assistance, an entity's accounting for the assistance and the effect of the assistance on an entity's financial statements.	January 1, 2022	The Company is currently evaluating the impact the guidance will have on its disclosures for the year ended December 31, 2022.
ASU 2020-04 - Reference Rate Reform	In March 2020, the FASB issued optional guidance to ease the facilitation of the effects of reference rate reform on financial reporting. The guidance applies to certain contract modifications, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Beginning January 1, 2022, LIBOR or other discontinued reference rates cannot be applied to new contracts. New contracts will incorporate a new reference rate, which includes SOFR. LIBOR or other discontinued reference rates cannot be applied to contract modifications or hedging relationships entered into or evaluated after December 31, 2022. Existing contracts referencing LIBOR or other reference rates expected to be discontinued must identify a replacement rate by June 30, 2023.	Effective as of March 12, 2020 and will continue through December 31, 2022	The Company has updated its credit agreements to include language regarding the successor or alternate rate to LIBOR, and a review of other contracts and agreements is on-going. The Company does not expect the guidance to have a material impact on its results of operations, financial position, cash flows or disclosures.

Note 3 - Seasonality of operations

Some of the Company's operations are highly seasonal and revenues from, and certain expenses for, such operations may fluctuate significantly among quarterly periods. Accordingly, the interim results for particular businesses, and for the Company as a whole, may not be indicative of results for the full fiscal year.

Note 4 - Receivables and allowance for expected credit losses

Receivables consists primarily of trade receivables from the sale of goods and services, which are recorded at the invoiced amount, and contract assets, net of expected credit losses. For more information on contract assets, see Note 9. The Company's trade receivables are all due in 12 months or less. The total balance of receivables past due 90 days or more was $41.5 million, $37.9 million and $44.8 million at September 30, 2022 and 2021, and December 31, 2021, respectively.

The Company's expected credit losses are determined through a review using historical credit loss experience; changes in asset specific characteristics; current conditions; and reasonable and supportable future forecasts, among other specific account data, and is performed at least quarterly. The Company develops and documents its methodology to determine its allowance for expected credit losses at each of its reportable business segments. Risk characteristics used by the business segments may include customer mix, knowledge of customers and general economic conditions of the various local economies, among others. Specific account balances are written off when management determines the amounts to be uncollectible. Management has reviewed the balance reserved through the allowance for expected credit losses and believes it is reasonable.

13

Details of the Company's expected credit losses were as follows:

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2021	$	269	$	1,506	$	2	$	5,406	$	2,533	$	9,716
Current expected credit loss provision	565		1,369		—		(253)		54		1,735
Less write-offs charged against the allowance	597		932		—		27		71		1,627
Credit loss recoveries collected	124		180		—		—		28		332
At March 31, 2022	$	361	$	2,123	$	2	$	5,126	$	2,544	$	10,156
Current expected credit loss provision	113		92		—		12		292		509
Less write-offs charged against the allowance	234		939		—		108		104		1,385
Credit loss recoveries collected	108		177		—		—		—		285
At June 30, 2022	$	348	$	1,453	$	2	$	5,030	$	2,732	$	9,565
Current expected credit loss provision	300		881		—		(55)		(111)		1,015
Less write-offs charged against the allowance	399		1,822		—		75		152		2,448
Credit loss recoveries collected	85		169		—		—		40		294
At September 30, 2022	$	334	$	681	$	2	$	4,900	$	2,509	$	8,426

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2020	$	899	$	2,571	$	2	$	6,164	$	5,722	$	15,358
Current expected credit loss provision	538		1,273		—		(1,049)		(1,079)		(317)
Less write-offs charged against the allowance	888		1,107		—		273		401		2,669
Credit loss recoveries collected	129		213		—		—		—		342
At March 31, 2021	$	678	$	2,950	$	2	$	4,842	$	4,242	$	12,714
Current expected credit loss provision	(110)		(103)		—		11		(639)		(841)
Less write-offs charged against the allowance	341		787		—		232		64		1,424
Credit loss recoveries collected	100		199		—		—		—		299
At June 30, 2021	$	327	$	2,259	$	2	$	4,621	$	3,539	$	10,748
Current expected credit loss provision	388		411		—		233		(675)		357
Less write-offs charged against the allowance	525		1,178		—		184		265		2,152
Credit loss recoveries collected	92		168		—		—		93		353
At September 30, 2021	$	282	$	1,660	$	2	$	4,670	$	2,692	$	9,306

Note 5 - Inventories and natural gas in storage

Natural gas in storage for the Company's regulated operations is generally valued at lower of cost or market using the last-in, first-out method or lower of cost or net realizable value using the average cost or first-in, first-out method. The majority of all other inventories are valued at the lower of cost or net realizable value using the average cost method. The portion of the cost of natural gas in storage expected to be used within 12 months was included in inventories. Inventories on the Consolidated Balance Sheets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Aggregates held for resale	$	198,711	$	183,693	$	184,363
Asphalt oil	56,609		32,964		57,002
Natural gas in storage (current)	48,532		28,683		18,867
Materials and supplies	42,359		27,253		30,629
Merchandise for resale	39,198		26,639		28,501
Other	13,233		13,053		16,247
Total	$	398,642	$	312,285	$	335,609

The remainder of natural gas in storage, which largely represents the cost of gas required to maintain pressure levels for normal operating purposes, was included in noncurrent assets - other and was $47.2 million at September 30, 2022 and $47.5 million at both September 30, 2021 and December 31, 2021.

14

Note 6 - Earnings per share

Basic earnings per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the applicable period. Diluted earnings per share is computed by dividing net income by the total of the weighted average number of shares of common stock outstanding during the applicable period, plus the effect of non-vested performance share awards and restricted stock units. Common stock outstanding includes issued shares less shares held in treasury. Net income was the same for both the basic and diluted earnings per share calculations. A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands, except per share amounts)
Weighted average common shares outstanding - basic	203,351		202,863		203,351		201,647
Effect of dilutive performance share awards and restricted stock units	293		327		56		308
Weighted average common shares outstanding - diluted	203,644		203,190		203,407		201,955
Shares excluded from the calculation of diluted earnings per share	—		—		77		—
Dividends declared per common share	$	.2175	$	.2125	$	.6525	$	.6375

Note 7 - Equity

The Company currently has a shelf registration statement on file with the SEC, under which the Company may issue and sell any combination of common stock and debt securities. The Company may sell such securities if warranted by market conditions and the Company's capital requirements.

In August 2020, the Company amended the Distribution Agreement dated February 22, 2019, with J.P. Morgan Securities LLC and MUFG Securities Americas Inc., as sales agents. This agreement, as amended, allows the offering, issuance and sale of up to 6.4 million shares of the Company's common stock in connection with an "at-the-market" offering. The common stock may be offered for sale, from time to time, in accordance with the terms and conditions of this agreement. As of September 30, 2022, the Company had capacity to issue up to 3.6 million additional shares of common stock under the "at-the-market" offering program.

Details of the Company's "at-the-market" offering activity was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2022		2021			2022		2021
	(In millions)
Shares issued	—		1.0			—		2.8
Net proceeds *	$	—	$	34.2	**	$	(.1)	$	88.8	**

*    Net proceeds include issuance costs of $— and $149,000 for the three and nine months ended September 30, 2022, respectively, and $425,000 and $1.2 million for the three and nine months ended September 30, 2021, respectively.

**    Net proceeds were used for capital expenditures.

15

Note 8 - Accumulated other comprehensive loss

The after-tax changes in the components of accumulated other comprehensive loss were as follows:

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2021	$	(538)	$	(40,461)	$	(5)	$	(41,004)
Other comprehensive loss before reclassifications	—		—		(320)		(320)
Amounts reclassified from accumulated other comprehensive loss	112		445		32		589
Net current-period other comprehensive income (loss)	112		445		(288)		269
At March 31, 2022	$	(426)	$	(40,016)	$	(293)	$	(40,735)
Other comprehensive loss before reclassifications	—		—		(128)		(128)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset	—		(3,265)		—		(3,265)
Amounts reclassified from accumulated other comprehensive loss	111		461		25		597
Net current-period other comprehensive income (loss)	111		(2,804)		(103)		(2,796)
At June 30, 2022	$	(315)	$	(42,820)	$	(396)	$	(43,531)
Other comprehensive loss before reclassifications	—		—		(329)		(329)
Amounts reclassified from accumulated other comprehensive loss	111		461		42		614
Net current-period other comprehensive income (loss)	111		461		(287)		285
At September 30, 2022	$	(204)	$	(42,359)	$	(683)	$	(43,246)

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2020	$	(984)	$	(47,207)	$	113	$	(48,078)
Other comprehensive loss before reclassifications	—		—		(44)		(44)
Amounts reclassified from accumulated other comprehensive loss	111		466		35		612
Net current-period other comprehensive income (loss)	111		466		(9)		568
At March 31, 2021	$	(873)	$	(46,741)	$	104	$	(47,510)
Other comprehensive loss before reclassifications	—		—		(52)		(52)
Amounts reclassified from accumulated other comprehensive loss	112		457		25		594
Net current-period other comprehensive income (loss)	112		457		(27)		542
At June 30, 2021	$	(761)	$	(46,284)	$	77	$	(46,968)
Other comprehensive loss before reclassifications	—		—		(54)		(54)
Amounts reclassified from accumulated other comprehensive loss	111		466		20		597
Net current-period other comprehensive income (loss)	111		466		(34)		543
At September 30, 2021	$	(650)	$	(45,818)	$	43	$	(46,425)

16

The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended				Nine Months Ended				Location on Consolidated Statements of Income
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	(148)	$	(147)	$	(443)	$	(443)	Interest expense
	37		36		109		109		Income taxes
	(111)		(111)		(334)		(334)
Amortization of postretirement liability losses included in net periodic benefit credit	(609)		(617)		(1,827)		(1,851)		Other income
	148		151		460		462		Income taxes
	(461)		(466)		(1,367)		(1,389)
Reclassification adjustment on available-for-sale investments included in net income	(54)		(26)		(126)		(101)		Other income
	12		6		27		21		Income taxes
	(42)		(20)		(99)		(80)
Total reclassifications	$	(614)	$	(597)	$	(1,800)	$	(1,803)

Note 9 - Revenue from contracts with customers

Revenue is recognized when a performance obligation is satisfied by transferring control over a product or service to a customer. Revenue is measured based on consideration specified in a contract with a customer and excludes any sales incentives and amounts collected on behalf of third parties. The Company is considered an agent for certain taxes collected from customers. As such, the Company presents revenues net of these taxes at the time of sale to be remitted to governmental authorities, including sales and use taxes.

Disaggregation

In the following tables, revenue is disaggregated by the type of customer or service provided. The Company believes this level of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The table also includes a reconciliation of the disaggregated revenue by reportable segments. For more information on the Company's business segments, see Note 17.

Three Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,981	$	64,074	$	—	$	—	$	—	$	—	$	101,055
Commercial utility sales	38,785		43,734		—		—		—		—		82,519
Industrial utility sales	10,838		7,209		—		—		—		—		18,047
Other utility sales	2,002		—		—		—		—		—		2,002
Natural gas transportation	—		11,910		32,144		—		—		—		44,054
Natural gas storage	—		—		3,595		—		—		—		3,595
Contracting services	—		—		—		492,207		—		—		492,207
Construction materials	—		—		—		742,982		—		—		742,982
Intrasegment eliminations	—		—		—		(259,761)		—		—		(259,761)
Electrical & mechanical specialty contracting	—		—		—		—		543,717		—		543,717
Transmission & distribution specialty contracting	—		—		—		—		181,550		—		181,550
Other	10,758		3,494		3,815		—		200		4,438		22,705
Intersegment eliminations	(124)		(139)		(3,595)		(343)		(2,229)		(4,438)		(10,868)
Revenues from contracts with customers	99,240		130,282		35,959		975,085		723,238		—		1,963,804
Other revenues	(47)		1,792		86		—		11,571		—		13,402
Total external operating revenues	$	99,193	$	132,074	$	36,045	$	975,085	$	734,809	$	—	$	1,977,206

17

Three Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,412	$	55,284	$	—	$	—	$	—	$	—	$	91,696
Commercial utility sales	39,033		35,338		—		—		—		—		74,371
Industrial utility sales	10,495		5,395		—		—		—		—		15,890
Other utility sales	1,993		—		—		—		—		—		1,993
Natural gas transportation	—		11,812		28,058		—		—		—		39,870
Natural gas storage	—		—		3,483		—		—		—		3,483
Contracting services	—		—		—		415,106		—		—		415,106
Construction materials	—		—		—		617,823		—		—		617,823
Intrasegment eliminations	—		—		—		(201,630)		—		—		(201,630)
Electrical & mechanical specialty contracting	—		—		—		—		317,238		—		317,238
Transmission & distribution specialty contracting	—		—		—		—		185,842		—		185,842
Other	12,589		2,110		3,290		—		75		3,423		21,487
Intersegment eliminations	(136)		(142)		(3,908)		(110)		(289)		(3,398)		(7,983)
Revenues from contracts with customers	100,386		109,797		30,923		831,189		502,866		25		1,575,186
Other revenues	(1,456)		581		45		—		11,657		—		10,827
Total external operating revenues	$	98,930	$	110,378	$	30,968	$	831,189	$	514,523	$	25	$	1,586,013

Nine Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	103,648	$	439,639	$	—	$	—	$	—	$	—	$	543,287
Commercial utility sales	108,400		279,697		—		—		—		—		388,097
Industrial utility sales	32,067		29,242		—		—		—		—		61,309
Other utility sales	5,632		—		—		—		—		—		5,632
Natural gas transportation	—		35,747		95,685		—		—		—		131,432
Natural gas storage	—		—		10,210		—		—		—		10,210
Contracting services	—		—		—		937,156		—		—		937,156
Construction materials	—		—		—		1,535,077		—		—		1,535,077
Intrasegment eliminations	—		—		—		(475,026)		—		—		(475,026)
Electrical & mechanical specialty contracting	—		—		—		—		1,443,758		—		1,443,758
Transmission & distribution specialty contracting	—		—		—		—		496,190		—		496,190
Other	33,727		9,854		8,200		—		357		13,168		65,306
Intersegment eliminations	(371)		(416)		(37,328)		(674)		(5,090)		(13,168)		(57,047)
Revenues from contracts with customers	283,103		793,763		76,767		1,996,533		1,935,215		—		5,085,381
Other revenues	(4,854)		(831)		210		—		34,780		—		29,305
Total external operating revenues	$	278,249	$	792,932	$	76,977	$	1,996,533	$	1,969,995	$	—	$	5,114,686

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Nine Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	99,106	$	341,901	$	—	$	—	$	—	$	—	$	441,007
Commercial utility sales	105,795		203,002		—		—		—		—		308,797
Industrial utility sales	30,878		20,387		—		—		—		—		51,265
Other utility sales	5,384		—		—		—		—		—		5,384
Natural gas transportation	—		35,715		85,160		—		—		—		120,875
Natural gas storage	—		—		10,606		—		—		—		10,606
Contracting services	—		—		—		791,964		—		—		791,964
Construction materials	—		—		—		1,332,997		—		—		1,332,997
Intrasegment eliminations	—		—		—		(394,126)		—		—		(394,126)
Electrical & mechanical specialty contracting	—		—		—		—		1,020,130		—		1,020,130
Transmission & distribution specialty contracting	—		—		—		—		502,328		—		502,328
Other	31,827		7,913		10,760		—		168		10,152		60,820
Intersegment eliminations	(407)		(425)		(38,000)		(314)		(2,128)		(10,082)		(51,356)
Revenues from contracts with customers	272,583		608,493		68,526		1,730,521		1,520,498		70		4,200,691
Other revenues	(5,329)		5,880		127		—		36,239		—		36,917
Total external operating revenues	$	267,254	$	614,373	$	68,653	$	1,730,521	$	1,556,737	$	70	$	4,237,608

Presented in the previous tables are intrasegment revenues within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.

Contract balances

The timing of revenue recognition may differ from the timing of invoicing to customers. The timing of invoicing to customers does not necessarily correlate with the timing of revenues being recognized under the cost-to-cost method of accounting. Contracts for construction work are billed as work progresses in accordance with agreed upon contractual terms. Generally, billing to the customer occurs contemporaneous to revenue recognition. A variance in timing of the billings may result in a contract asset or a contract liability. A contract asset occurs when revenues are recognized under the cost-to-cost measure of progress, which exceeds amounts billed on uncompleted contracts. Such amounts will be billed as standard contract terms allow, usually based on various measures of performance or achievement. A contract liability occurs when there are billings in excess of revenues recognized under the cost-to-cost measure of progress on uncompleted contracts. Contract liabilities decrease as revenue is recognized from the satisfaction of the related performance obligation.

The changes in contract assets and liabilities were as follows:

	September 30, 2022		December 31, 2021		Change		Location on Consolidated Balance Sheets
	(In thousands)
Contract assets	$	265,585	$	125,742	$	139,843	Receivables, net
Contract liabilities - current	(216,439)		(179,140)		(37,299)		Accounts payable
Contract liabilities - noncurrent	(12)		(118)		106		Noncurrent liabilities - other
Net contract assets (liabilities)	$	49,134	$	(53,516)	$	102,650

The Company recognized $11.2 million and $147.9 million in revenue for the three and nine months ended September 30, 2022, respectively, which was previously included in contract liabilities at December 31, 2021. The Company recognized $7.1 million and $152.4 million in revenue for the three and nine months ended September 30, 2021, respectively, which was previously included in contract liabilities at December 31, 2020.

The Company recognized a net increase in revenues of $14.5 million and $54.1 million for the three and nine months ended September 30, 2022, respectively, from performance obligations satisfied in prior periods. The company recognized a net increase in revenues of $19.2 million and $63.3 million for the three and nine months ended September 30, 2021, respectively, from performance obligations satisfied in prior periods.

19

Remaining performance obligations

The remaining performance obligations, also referred to as backlog, at the construction materials and contracting and construction services segments include unrecognized revenues that the Company reasonably expects to be realized. These unrecognized revenues can include: projects that have a written award, a letter of intent, a notice to proceed, an agreed upon work order to perform work on mutually accepted terms and conditions and change orders or claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under master service agreements. The majority of the Company's construction contracts have an original duration of less than two years.

The remaining performance obligations at the pipeline segment include firm transportation contracts with fixed pricing and fixed volumes. The Company has applied the practical expedient, which does not require additional disclosures for contracts with an original duration of less than 12 months, to certain firm transportation and non-regulated contracts. The Company's firm transportation contracts included in the remaining performance obligations have weighted average remaining durations of less than five years.

At September 30, 2022, the Company's remaining performance obligations were $3.3 billion. The Company expects to recognize the following revenue amounts in future periods related to these remaining performance obligations: $2.6 billion within the next 12 months or less; $369.7 million within the next 13 to 24 months; and $418.1 million in 25 months or more.

Note 10 - Business combinations

The following acquisitions were accounted for as business combinations in accordance with ASC 805 - Business Combinations. The results of the acquired businesses have been included in the Consolidated Financial Statements beginning on the acquisition date. Pro forma financial amounts reflecting the effects of the business combinations are not presented, as none of these business combinations, individually or in the aggregate, were material to the Company's financial position or results of operations.

The acquisitions are also subject to customary adjustments based on, among other things, the amount of cash, debt and working capital in the business as of the closing date. The amounts included in the Consolidated Balance Sheets for these adjustments are considered provisional until final settlement has occurred.

The Company had no acquisitions in the nine months ended September 30, 2022.

In 2021, the construction materials and contracting segment's acquisitions included:

•Baker Rock Resources and Oregon Mainline Paving, two construction materials companies located around the Portland, Oregon metro area, acquired in November 2021. As of September 30, 2022, the purchase price allocation was settled with no material adjustments to the provisional accounting.

•Mt. Hood Rock, a construction aggregates business in Oregon, acquired in April 2021. As of March 31, 2022, the purchase price allocation was settled with no material adjustments to the provisional accounting.

In 2021, the total purchase price for acquisitions was $236.1 million, subject to certain adjustments, with cash acquired totaling $900,000. The purchase price includes consideration paid of $235.2 million. The amounts allocated to the aggregated assets acquired and liabilities assumed during 2021 were as follows: $17.0 million to current assets; $179.8 million to property, plant and equipment; $50.6 million to goodwill; $2.2 million to other intangible assets; $8.7 million to current liabilities; $2.5 million to noncurrent liabilities - other; and $3.2 million to deferred tax liabilities. During the first quarter of 2022, measurement period adjustments were made to previously reported provisional amounts, which decreased goodwill and increased property, plant and equipment by $2.1 million. The Company issued debt to finance these acquisitions.

Costs incurred for acquisitions are included in operation and maintenance expense on the Consolidated Statements of Income. For the nine months ended September 30, 2022, the Company had no acquisition costs. For the nine months ended September 30, 2021, acquisition costs were not material.

Note 11 - Leases

The Company's leases primarily include operating leases for equipment, buildings, easements and vehicles. The Company leases certain equipment to third parties through its utility and construction services segments, which are considered short-term operating leases with terms of less than 12 months.

The Company recognized revenue from operating leases of $11.7 million and $35.1 million for the three and nine months ended September 30, 2022, respectively. The Company recognized revenue from operating leases of $11.8 million and $36.6 million for the three and nine months ended September 30, 2021, respectively. At September 30, 2022, the Company had $9.1 million of lease receivables with a majority due within 12 months.

20

Note 12 - Goodwill and other intangible assets

The changes in the carrying amount of goodwill were as follows:

	Balance at January 1, 2022		Goodwill Acquired During  the Year		Measurement Period Adjustments		Balance at September 30, 2022
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	276,426		—		(2,124)		274,302
Construction services	143,224		—		—		143,224
Total	$	765,386	$	—	$	(2,124)	$	763,262

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		2,900		(217)		228,686
Construction services	143,224		—		—		143,224
Total	$	714,963	$	2,900	$	(217)	$	717,646

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		50,640		(217)		276,426
Construction services	143,224		—		—		143,224
Total	$	714,963	$	50,640	$	(217)	$	765,386

Other amortizable intangible assets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Customer relationships	$	28,990	$	29,423	$	29,740
Less accumulated amortization	12,768		9,705		10,650
	16,222		19,718		19,090
Noncompete agreements	4,591		3,991		4,591
Less accumulated amortization	3,377		2,710		2,856
	1,214		1,281		1,735
Other	5,279		11,957		12,601
Less accumulated amortization	3,970		10,715		10,848
	1,309		1,242		1,753
Total	$	18,745	$	22,241	$	22,578

The previous tables include goodwill and intangible assets associated with the business combinations completed during 2021. For more information related to these business combinations, see Note 10.

Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2022, was $1.3 million and $3.8 million, respectively. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2021, was $1.2 million and $3.9 million, respectively. Estimated amortization expense for identifiable intangible assets as of September 30, 2022, was:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Amortization expense	$	1,159	$	4,591	$	4,249	$	2,200	$	1,781	$	4,765

21

Note 13 - Regulatory assets and liabilities

The following table summarizes the individual components of unamortized regulatory assets and liabilities:

	Estimated Recovery or Refund Period as of September 30, 2022	*	September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Regulatory assets:
Current:
Natural gas costs recoverable through rate adjustments	Up to 1 year		$	112,079	$	98,211	$	86,371
Conservation programs	Up to 1 year		9,363		8,495		8,225
Decoupling	Up to 1 year		6,549		7,195		9,131
Cost recovery mechanisms	Up to 1 year		3,354		4,693		4,536
Other	Up to 1 year		16,815		14,541		10,428
			148,160		133,135		118,691
Noncurrent:
Pension and postretirement benefits	**		137,582		155,888		142,681
Cost recovery mechanisms	Up to 10 years		67,094		43,955		44,870
Plant costs/asset retirement obligations	Over plant lives		61,941		73,528		63,116
Plant to be retired	-		24,740		48,544		50,070
Manufactured gas plant site remediation	-		25,963		26,000		26,053
Taxes recoverable from customers	Over plant lives		12,394		11,438		12,339
Long-term debt refinancing costs	Up to 38 years		3,335		3,952		3,794
Natural gas costs recoverable through rate adjustments	Up to 2 years		462		6,084		5,186
Other	Up to 17 years		10,931		9,856		9,742
			344,442		379,245		357,851
Total regulatory assets			$	492,602	$	512,380	$	476,542
Regulatory liabilities:
Current:
Taxes refundable to customers	Up to 1 year		$	4,264	$	3,867	$	3,841
Electric fuel and purchased power deferral	Up to 1 year		3,763		3,205		—
Cost recovery mechanisms	Up to 1 year		2,674		2,797		214
Natural gas costs refundable through rate adjustments	Up to 1 year		873		—		6,700
Other	Up to 1 year		7,025		6,622		5,548
			18,599		16,491		16,303
Noncurrent:
Taxes refundable to customers	Over plant lives		205,517		218,566		215,421
Plant removal and decommissioning costs	Over plant lives		174,481		172,683		168,152
Pension and postretirement benefits	**		19,687		16,915		20,434
Accumulated deferred investment tax credit	Up to 20 years		14,665		12,403		12,696
Cost recovery mechanisms	Up to 20 years		12,535		—		7,727
Other	Up to 16 years		6,327		5,574		4,360
			433,212		426,141		428,790
Total regulatory liabilities			$	451,811	$	442,632	$	445,093
Net regulatory position			$	40,791	$	69,748	$	31,449

*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers.

**    Recovered as expense is incurred or cash contributions are made.

At September 30, 2022 and 2021, and December 31, 2021, approximately $264.4 million, $318.2 million and $296.6 million, respectively, of regulatory assets were not earning a rate of return; however, these regulatory assets are expected to be recovered from customers in future rates. These assets are largely comprised of the unfunded portion of pension and postretirement benefits, asset retirement obligations, accelerated depreciation on plant retirement and the estimated future cost of manufactured gas plant site remediation.

In the last half of 2021 and in 2022, the Company has experienced higher natural gas costs due to the increase in demand outpacing the supply along with the impact of global events. This increase in natural gas costs experienced in certain jurisdictions has been partially offset by the recovery of prior period natural gas costs being recovered over a period longer than the normal one-year period, as further discussed below.

22

In February 2021, a prolonged period of unseasonably cold temperatures in the central United States significantly increased the demand for electric and natural gas services and contributed to increased market prices. Overall, Montana-Dakota and Great Plains incurred approximately $44.0 million in increased natural gas costs in order to maintain services for its customers. These extraordinary gas costs were recorded as regulatory assets as they are expected to be recovered from customers. With the exception of $845,000 in Minnesota, Montana-Dakota and Great Plains have received approval for the recovery of purchased gas adjustments related to the cold-weather event in all jurisdictions impacted, including out-of-cycle purchased gas adjustment requests in most jurisdictions. For a discussion of the Company's most recent cases by jurisdiction, see Note 19.

In 2019, the Company experienced increased natural gas costs in Washington from the rupture of the Enbridge pipeline in Canada in late 2018. As a result, the Company requested, and the WUTC approved, recovery through 2022 of the balance of natural gas costs recoverable related to this period of time, which was over three years rather than its normal one-year recovery period.

In February 2019, the Company announced the retirement of three aging coal-fired electric generating units. The Company accelerated the depreciation related to these facilities in property, plant and equipment and recorded the difference between the accelerated depreciation, in accordance with GAAP, and the depreciation approved for rate-making purposes as regulatory assets. Requests were filed with the NDPSC and SDPUC, and subsequently approved, to offset the savings associated with the cessation of operations of these units with the amortization of the deferred regulatory assets. The Company ceased operations of Lewis & Clark Station in March 2021 and Units 1 and 2 at Heskett Station in February 2022. The Company subsequently reclassified the costs being recovered for these facilities from plant retirement to cost recovery mechanisms in the previous table and began amortizing the associated plant retirement and closure costs in the jurisdictions where requests were filed, as previously discussed. The Company expects to recover the regulatory assets related to the plant retirements in future rates.

If, for any reason, the Company's regulated businesses cease to meet the criteria for application of regulatory accounting for all or part of their operations, the regulatory assets and liabilities relating to those portions ceasing to meet such criteria would be written off and included in the statement of income or accumulated other comprehensive loss in the period in which the discontinuance of regulatory accounting occurs.

Note 14 - Fair value measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The fair value ASC establishes a hierarchy for grouping assets and liabilities, based on the significance of inputs. The estimated fair values of the Company's assets and liabilities measured on a recurring basis are determined using the market approach.

The Company measures its investments in certain fixed-income and equity securities at fair value with changes in fair value recognized in income. The Company anticipates using these investments, which consist of insurance contracts, to satisfy its obligations under its unfunded, nonqualified defined benefit and defined contribution plans for executive officers and certain key management employees, and invests in these fixed-income and equity securities for the purpose of earning investment returns and capital appreciation. These investments, which totaled $95.2 million, $106.4 million and $109.6 million, at September 30, 2022 and 2021, and December 31, 2021, respectively, are classified as investments on the Consolidated Balance Sheets. The net unrealized loss on these investments was $2.6 million and $16.8 million for the three and nine months ended September 30, 2022, respectively. The net unrealized gain on these investments was $373,000 and $4.2 million for the three and nine months ended September 30, 2021. The change in fair value, which is considered part of the cost of the plan, is classified in other income on the Consolidated Statements of Income.

The Company did not elect the fair value option, which records gains and losses in income, for its available-for-sale securities, which include mortgage-backed securities and U.S. Treasury securities. These available-for-sale securities are recorded at fair value and are classified as investments on the Consolidated Balance Sheets. Unrealized gains or losses are recorded in accumulated other comprehensive loss. Details of available-for-sale securities were as follows:

September 30, 2022	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,486	$	—	$	783	$	7,703
U.S. Treasury securities	2,468		—		82		2,386
Total	$	10,954	$	—	$	865	$	10,089

23

September 30, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,597	$	93	$	11	$	8,679
U.S. Treasury securities	2,681		—		28		2,653
Total	$	11,278	$	93	$	39	$	11,332

December 31, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,702	$	51	$	47	$	8,706
U.S. Treasury securities	2,407		—		11		2,396
Total	$	11,109	$	51	$	58	$	11,102

The Company's assets measured at fair value on a recurring basis were as follows:

	Fair Value Measurements at September 30, 2022, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2022
	(In thousands)
Assets:
Money market funds	$	—	$	7,309	$	—	$	7,309
Insurance contracts*	—		95,170		—		95,170
Available-for-sale securities:
Mortgage-backed securities	—		7,703		—		7,703
U.S. Treasury securities	—		2,386		—		2,386
Total assets measured at fair value	$	—	$	112,568	$	—	$	112,568

*    The insurance contracts invest approximately 65 percent in fixed-income investments, 14 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.

	Fair Value Measurements at September 30, 2021, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	9,907	$	—	$	9,907
Insurance contracts*	—		106,371		—		106,371
Available-for-sale securities:
Mortgage-backed securities	—		8,679		—		8,679
U.S. Treasury securities	—		2,653		—		2,653
Total assets measured at fair value	$	—	$	127,610	$	—	$	127,610

*    The insurance contracts invest approximately 63 percent in fixed-income investments, 16 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 1 percent in cash equivalents.

24

	Fair Value Measurements at December 31, 2021, Using
	Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Balance at December 31, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	10,190	$	—	$	10,190
Insurance contracts*	—		109,603		—		109,603
Available-for-sale securities:
Mortgage-backed securities	—		8,706		—		8,706
U.S. Treasury securities	—		2,396		—		2,396
Total assets measured at fair value	$	—	$	130,895	$	—	$	130,895

*    The insurance contracts invest approximately 61 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.

The Company's money market funds are valued at the net asset value of shares held at the end of the period, based on published market quotations on active markets, or using other known sources including pricing from outside sources. The estimated fair value of the Company's mortgage-backed securities and U.S. Treasury securities are based on comparable market transactions, other observable inputs or other sources, including pricing from outside sources. The estimated fair value of the Company's insurance contracts are based on contractual cash surrender values that are determined primarily by investments in managed separate accounts of the insurer. These amounts approximate fair value. The managed separate accounts are valued based on other observable inputs or corroborated market data.

Though the Company believes the methods used to estimate fair value are consistent with those used by other market participants, the use of other methods or assumptions could result in a different estimate of fair value.

The Company applies the provisions of the fair value measurement standard to its nonrecurring, non-financial measurements, including long-lived asset impairments. These assets are not measured at fair value on an ongoing basis but are subject to fair value adjustments only in certain circumstances. The Company reviews the carrying value of its long-lived assets, excluding goodwill, whenever events or changes in circumstances indicate that such carrying amounts may not be recoverable.

The Company performed fair value assessments of the assets acquired and liabilities assumed in the business combinations that occurred during 2021. The fair value of these assets and liabilities were determined based on Level 2 and Level 3 inputs.

The Company's long-term debt is not measured at fair value on the Consolidated Balance Sheets and the fair value is being provided for disclosure purposes only. The fair value was categorized as Level 2 in the fair value hierarchy and was based on discounted future cash flows using current market interest rates. The estimated fair value of the Company's Level 2 long-term debt was as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Carrying amount	$	2,988,452	$	2,328,266	$	2,741,900
Fair value	$	2,647,387	$	2,599,907	$	2,984,866

The carrying amounts of the Company's remaining financial instruments included in current assets and current liabilities approximate their fair values.

Note 15 - Debt

Certain debt instruments of the Company's subsidiaries contain restrictive and financial covenants and cross-default provisions. In order to borrow under the debt agreements, the subsidiary companies must be in compliance with the applicable covenants and certain other conditions, all of which the subsidiaries, as applicable, were in compliance with at September 30, 2022. In the event the subsidiaries do not comply with the applicable covenants and other conditions, alternative sources of funding may need to be pursued.

Montana-Dakota's and Centennial's respective commercial paper programs are supported by revolving credit agreements. While the amount of commercial paper outstanding does not reduce available capacity under the respective revolving credit agreements, Montana-Dakota and Centennial do not issue commercial paper in an aggregate amount exceeding the available capacity under the credit agreements. The commercial paper borrowings may vary during the period, largely the result of fluctuations in working capital requirements due to the seasonality of certain operations of the Company's subsidiaries.

25

Short-term debt

Centennial On March 18, 2022, Centennial entered into a $100.0 million term loan agreement with a SOFR-based variable interest rate and a maturity date of March 17, 2023. The agreement contains customary covenants and provisions, including a covenant of Centennial not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent. The covenants also include certain restrictions on the sale of certain assets, loans and investments.

Long-term debt

Long-term Debt Outstanding Long-term debt outstanding was as follows:

	Weighted Average Interest Rate at September 30, 2022		September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Senior Notes due on dates ranging from October 22, 2022 to June 15, 2062	4.29	%	$	2,365,000	$	2,025,000	$	2,125,000
Commercial paper supported by revolving credit agreements	3.66	%	460,600		168,800		450,300
Credit agreements due on June 7, 2024	4.55	%	125,580		94,300		127,500
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029	7.32	%	35,000		35,000		35,000
Term Loan Agreement due on September 3, 2032	3.64	%	7,000		7,700		7,700
Other notes due on dates ranging from January 1, 2024 to January 1, 2061	.97	%	2,349		3,198		2,564
Less unamortized debt issuance costs			6,633		5,709		6,090
Less discount			444		23		74
Total long-term debt			2,988,452		2,328,266		2,741,900
Less current maturities			214,453		1,548		148,053
Net long-term debt			$	2,773,999	$	2,326,718	$	2,593,847

Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at September 30, 2022, were as follows:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Long-term debt maturities	$	147,253	$	77,923	$	646,983	$	177,802	$	140,802	$	1,804,766

Note 16 - Cash flow information

Cash expenditures for interest and income taxes were as follows:

	Nine Months Ended
	September 30,
	2022		2021
	(In thousands)
Interest, net*	$	75,425	$	59,876
Income taxes paid, net	$	17,664	$	61,250

*    AFUDC - borrowed was $2.4 million and $1.6 million for the nine months ended September 30, 2022 and 2021, respectively.

Noncash investing and financing transactions were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Right-of-use assets obtained in exchange for new operating lease liabilities	$	36,492	$	26,120	$	55,987
Property, plant and equipment additions in accounts payable	$	44,277	$	88,355	$	57,605
Debt assumed in connection with a business combination	$	—	$	—	$	10

26

Note 17 - Business segment data

The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer. The Company's operations are located within the United States.

The electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The natural gas distribution segment distributes natural gas in those states, as well as in Idaho, Minnesota, Oregon and Washington. These operations also supply related value-added services.

The pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides non-regulated cathodic protection and other energy-related services.

The construction materials and contracting segment mines, processes and sells construction aggregates (crushed stone, sand and gravel); produces and sells asphalt mix; and supplies ready-mix concrete. This segment focuses on vertical integration of its contracting services with its construction materials to support the aggregate-based product lines including aggregate placement, asphalt and concrete paving, and site development and grading. Although not common to all locations, other products include the sale of cement, asphalt oil for various commercial and roadway applications, various finished concrete products and other building materials and related contracting services. This segment operates in the central, southern and western United States, including Alaska and Hawaii.

The construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services across the United States. These specialty contracting services are provided to utilities and manufacturing, transportation, commercial, industrial, institutional, renewable and governmental customers. Its electrical and mechanical contracting services include construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. Its transmission and distribution contracting services include construction and maintenance of overhead and underground electrical, gas and communication infrastructure, as well as manufacturing and distribution of transmission line construction equipment and tools.

The Other category includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries. The function of the captive insurer is to fund the self-insured layers of the insured Company's general liability, automobile liability, pollution liability and other coverages. Centennial Capital also owns certain real and personal property. In addition, the Other category includes certain assets, liabilities and tax adjustments of the holding company primarily associated with corporate functions and certain general and administrative costs (reflected in operation and maintenance expense) and interest expense, which were previously allocated to the refining business and Fidelity and do not meet the criteria for income (loss) from discontinued operations, as well as transaction costs associated with the anticipated separation of Knife River.

Discontinued operations include the supporting activities of Fidelity other than certain general and administrative costs and interest expense as described above.

The information below follows the same accounting policies as described in Note 2 of the Notes to Consolidated Financial Statements in the 2021 Annual Report. Information on the Company's segments was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
External operating revenues:
Regulated operations:
Electric	$	99,193	$	98,930	$	278,249	$	267,254
Natural gas distribution	132,074		110,378		792,932		614,373
Pipeline	32,347		27,757		69,347		58,390
	263,614		237,065		1,140,528		940,017

27

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Non-regulated operations:
Pipeline	3,698		3,211		7,630		10,263
Construction materials and contracting	975,085		831,189		1,996,533		1,730,521
Construction services	734,809		514,523		1,969,995		1,556,737
Other	—		25		—		70
	1,713,592		1,348,948		3,974,158		3,297,591
Total external operating revenues	$	1,977,206	$	1,586,013	$	5,114,686	$	4,237,608
Intersegment operating revenues:
Regulated operations:
Electric	$	124	$	136	$	371	$	407
Natural gas distribution	139		142		416		425
Pipeline	3,508		3,845		36,845		37,530
	3,771		4,123		37,632		38,362
Non-regulated operations:
Pipeline	87		63		483		470
Construction materials and contracting	343		110		674		314
Construction services	2,229		289		5,090		2,128
Other	4,438		3,398		13,168		10,082
	7,097		3,860		19,415		12,994
Intersegment eliminations	(10,868)		(7,983)		(57,047)		(51,356)
Total intersegment operating revenues	$	—	$	—	$	—	$	—
Operating income (loss):
Electric	$	30,395	$	27,310	$	53,764	$	53,982
Natural gas distribution	(16,688)		(14,249)		38,929		42,925
Pipeline	14,963		12,284		39,447		35,896
Construction materials and contracting	147,367		133,712		157,116		171,274
Construction services	34,949		30,120		110,588		108,172
Other	(1,135)		(8)		(2,081)		(226)
Total operating income	$	209,851	$	189,169	$	397,763	$	412,023
Net income (loss):
Regulated operations:
Electric	$	21,596	$	20,564	$	37,476	$	41,618
Natural gas distribution	(18,058)		(15,390)		10,758		20,081
Pipeline	9,379		10,225		24,527		27,508
	12,917		15,399		72,761		89,207
Non-regulated operations:
Pipeline	492		356		(187)		1,166
Construction materials and contracting	102,764		96,282		95,337		116,865
Construction services	27,977		23,130		83,755		81,839
Other	3,783		3,795		(1,368)		2,172
	135,016		123,563		177,537		202,042
Income from continuing operations	147,933		138,962		250,298		291,249
Discontinued operations, net of tax	38		314		103		348
Net income	$	147,971	$	139,276	$	250,401	$	291,597

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Note 18 - Employee benefit plans

Pension and other postretirement plans

The Company has noncontributory qualified defined benefit pension plans and other postretirement benefit plans for certain eligible employees.

Components of net periodic benefit credit for the Company's pension benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,630	$	2,455	$	7,892	$	7,365
Expected return on assets	(4,864)		(4,894)		(14,592)		(14,682)
Amortization of net actuarial loss	1,670		2,004		5,012		6,012
Net periodic benefit credit	$	(564)	$	(435)	$	(1,688)	$	(1,305)

Components of net periodic benefit credit for the Company's other postretirement benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400	$	1,062	$	1,200
Interest cost	474		466		1,422		1,398
Expected return on assets	(1,322)		(1,275)		(3,966)		(3,825)
Amortization of prior service credit	(350)		(349)		(1,050)		(1,047)
Amortization of net actuarial (gain) loss	(55)		6		(163)		18
Net periodic benefit credit, including amount capitalized	(899)		(752)		(2,695)		(2,256)
Less amount capitalized	48		46		132		129
Net periodic benefit credit	$	(947)	$	(798)	$	(2,827)	$	(2,385)

The components of net periodic benefit credit, other than the service cost component, are included in other income on the Consolidated Statements of Income. The service cost component is included in operation and maintenance expense on the Consolidated Statements of Income.

Nonqualified defined benefit plans

In addition to the qualified defined benefit pension plans reflected in the table at the beginning of this note, the Company also has unfunded, nonqualified defined benefit plans for executive officers and certain key management employees. The Company's net periodic benefit cost for these plans was $773,000 and $769,000 for the three months ended September 30, 2022 and 2021, respectively, and $2.3 million for both the nine months ended September 30, 2022 and 2021. The components of net periodic benefit cost for these plans are included in other income on the Consolidated Statements of Income.

Note 19 - Regulatory matters

The Company regularly reviews the need for electric and natural gas rate changes in each of the jurisdictions in which service is provided. The Company files for rate adjustments to seek recovery of operating costs and capital investments, as well as reasonable returns as allowed by regulators. Certain regulatory proceedings and cases may also contain recurring mechanisms that can have an annual true-up. Examples of these recurring mechanisms include: infrastructure riders, transmission trackers, renewable resource cost adjustment riders, as well as weather normalization and decoupling mechanisms. The following paragraphs summarize the Company's significant open regulatory proceedings and cases by jurisdiction including updates to those reported in the 2021 Annual Report and should be read in conjunction with previous filings. The Company is unable to predict the ultimate outcome of these matters, the timing of final decisions of the various regulators and courts, or the effect on the Company's results of operations, financial position or cash flows.

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MNPUC

Great Plains defers the difference between the actual cost of gas spent to serve customers and that recovered from customers on a monthly basis. Annually, Great Plains prepares a true-up pursuant to the purchased gas adjustment tariff. On August 30, 2021, the MNPUC issued an order to allow Great Plains recovery of an out-of-cycle cost of gas adjustment of $8.8 million over a period of 27 months. The order was effective September 1, 2021, and was subject to a prudence review by the MNPUC. The requested increase was for the February 2021 extreme cold weather, primarily in the central United States, and market conditions surrounding the natural gas commodity market. On October 19, 2022, the MNPUC issued a final order disallowing $845,000 of the gas costs. These costs, which were deferred as a regulatory asset in natural gas costs recoverable through rate adjustments, were then recorded to expense as they were no longer recoverable from customers.

On June 1, 2022, Great Plains filed an application with the MNPUC for a decrease in its depreciation and amortization rates of approximately $1.2 million annually or a decrease from a combined rate of 4.5 percent to 2.8 percent. Great Plains has requested the rates be retroactive to January 1, 2022. This matter is pending before the MNPUC.

NDPSC

On May 16, 2022, Montana-Dakota filed an application with the NDPSC for an electric general rate increase of approximately $25.4 million annually or 12.3 percent above current rates. The requested increase is primarily to recover investments in production, transmission and distribution facilities and the associated depreciation, operation and maintenance expenses and taxes associated with the increased investment. The NDPSC has 7 months to render a final decision on the rate case. On July 14, 2022, the NDPSC approved an interim rate increase of approximately $10.9 million annually or 5.3 percent above current rates, subject to refund, for service rendered on and after July 15, 2022. The lower interim rate increase is largely due to excluding the recovery of Heskett Unit 4, which is expected to be in service in the first half of 2023.

On July 15, 2022, Montana-Dakota filed an application with the NDPSC to request an update to its transmission cost adjustment rider requesting to recover revenues of $12.9 million, which includes a true-up of the prior period adjustment, resulting in a decrease of $1.6 million from current rates. The request is to recover transmission-related expenses and the revenue requirement for transmission facilities not currently recovered through electric service rates. On October 5, 2022, the NDPSC approved the decrease with rates effective November 1, 2022.

Montana-Dakota has a renewable resource cost adjustment rate tariff that allows for annual adjustments for recent projected capital costs and related expenses for projects determined to be recoverable under the tariff. On November 1, 2022, Montana-Dakota filed an annual update to its renewable resource cost adjustment requesting to recover a revenue requirement of approximately $17.9 million annually. The update reflects a decrease of approximately $127,000 from the revenues currently included in rates.

WUTC

On September 30, 2021, Cascade filed an application with the WUTC for a natural gas rate increase of approximately $13.7 million annually or approximately 5.1 percent above current rates. The requested increase was primarily to recover investments made in infrastructure upgrades, as well as to recover 2021 wage increases. On March 22, 2022, Cascade filed a multi-party settlement and stipulation on behalf of Cascade and the staff of the WUTC that would result in a revenue requirement increase of approximately $10.7 million annually or approximately 4.0 percent above current rates. The WUTC issued a final order on August 23, 2022, adjusting the settlement primarily for 2020 actual depreciation expense. The final order approved an increase of $7.2 million annually with an effective date of September 1, 2022.

On March 24, 2022, Cascade filed a request for a tariff revision with the WUTC to rectify an inadvertent IRS normalization violation resulting from its tariff established in 2018 that passes back to customers the reversal of plant-related excess deferred income taxes through an annual rate adjustment. This request was made in response to the issuance of an IRS private letter ruling to another Washington utility with the same annual rate adjustment tariff, which addressed its normalization violation. The private letter ruling concluded the tariff to refund excess deferred income taxes without corresponding adjustments for other components of rate base or changes in depreciation or income tax expense, is an impermissible methodology under the IRS normalization and consistency rules. Cascade's request proposes a similar remedy through the tariff to recover the excess amounts refunded to customers while this tariff has been in place, and revises the method going forward to reflect excess deferred income taxes in rates in the same manner as other components of rate base from its most recent general rate case. Cascade has requested recovery of the excess refunded to customers of approximately $3.3 million and elimination of the currently deferred, but not yet refunded balance. A multi-party settlement was filed with the WUTC on October 21, 2022. This matter is pending before the WUTC.

On October 14, 2022, Cascade filed an update to its annual pipeline cost recovery mechanism requesting an increase in annual revenue of approximately $1.2 million or approximately 0.4 percent. The filing was effective November 1, 2022.

FERC

On September 1, 2022, Montana-Dakota filed an update to its transmission formula rate under the MISO tariff for its multi-value project and network upgrade charges for $15.4 million, which is effective January 1, 2023.

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Note 20 - Contingencies

The Company is party to claims and lawsuits arising out of its business and that of its consolidated subsidiaries, which may include, but are not limited to, matters involving property damage, personal injury, and environmental, contractual, statutory and regulatory obligations. The Company accrues a liability for those contingencies when the incurrence of a loss is probable and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The Company does not accrue liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is probable or reasonably possible and which are material, the Company discloses the nature of the contingency and, in some circumstances, an estimate of the possible loss. Accruals are based on the best information available, but in certain situations management is unable to estimate an amount or range of a reasonably possible loss including, but not limited to when: (1) the damages are unsubstantiated or indeterminate, (2) the proceedings are in the early stages, (3) numerous parties are involved, or (4) the matter involves novel or unsettled legal theories.

At September 30, 2022 and 2021, and December 31, 2021, the Company accrued contingent liabilities, which have not been discounted, of $33.6 million, $34.7 million and $37.0 million, respectively. At September 30, 2022 and 2021, and December 31, 2021, the Company also recorded corresponding insurance receivables of $11.9 million, $11.7 million and $14.1 million, respectively, and regulatory assets of $20.5 million, $21.1 million and $21.2 million, respectively, related to the accrued liabilities. The accruals are for contingencies resulting from litigation, production taxes, royalty claims and environmental matters. This includes amounts that have been accrued for matters discussed in Environmental matters within this note. The Company will continue to monitor each matter and adjust accruals as might be warranted based on new information and further developments. Management believes that the outcomes with respect to probable and reasonably possible losses in excess of the amounts accrued, net of insurance recoveries, while uncertain, either cannot be estimated or will not have a material effect upon the Company's financial position, results of operations or cash flows. Unless otherwise required by GAAP, legal costs are expensed as they are incurred.

Environmental matters

The Company is a party to claims for the cleanup of environmental contamination at certain manufactured gas plant sites, as well as a superfund site. There were no material changes to the Company's environmental matters that were previously reported in the 2021 Annual Report.

Guarantees

Certain subsidiaries of the Company have outstanding guarantees to third parties that guarantee the performance of other subsidiaries of the Company. These guarantees are related to construction contracts, insurance deductibles and loss limits, and certain other guarantees. At September 30, 2022, the fixed maximum amounts guaranteed under these agreements aggregate $333.7 million. Certain of the guarantees also have no fixed maximum amounts specified. At September 30, 2022, the amounts of scheduled expiration of the maximum amounts guaranteed under these agreements aggregate to $10.8 million in 2022; $68.6 million in 2023; $110.6 million in 2024; $130.5 million in 2025; $1.3 million in 2026; $700,000 thereafter; and $11.2 million, which has no scheduled maturity date. There were no amounts outstanding under the previously mentioned guarantees at September 30, 2022. In the event of default under these guarantee obligations, the subsidiary issuing the guarantee for that particular obligation would be required to make payments under its guarantee.

Certain subsidiaries have outstanding letters of credit to third parties related to insurance policies and other agreements, some of which are guaranteed by other subsidiaries of the Company. At September 30, 2022, the fixed maximum amounts guaranteed under these letters of credit aggregated $25.0 million. At September 30, 2022, the amounts of scheduled expiration of the maximum amounts guaranteed under these letters of credit aggregate to $21.8 million in 2022, $2.7 million in 2023 and $500,000 in 2024. There were no amounts outstanding under the previously mentioned letters of credit at September 30, 2022. In the event of default under these letter of credit obligations, the subsidiary guaranteeing the letter of credit would be obligated for reimbursement of payments made under the letter of credit.

In addition, Centennial, Knife River and MDU Construction Services have issued guarantees to third parties related to the routine purchase of maintenance items, materials and lease obligations for which no fixed maximum amounts have been specified. These guarantees have no scheduled maturity date. In the event a subsidiary of the Company defaults under these obligations, Centennial, Knife River or MDU Construction Services would be required to make payments under these guarantees. Any amounts outstanding by subsidiaries of the Company were reflected on the Consolidated Balance Sheet at September 30, 2022.

In the normal course of business, Centennial has surety bonds related to construction contracts and reclamation obligations of its subsidiaries. In the event a subsidiary of Centennial does not fulfill a bonded obligation, Centennial would be responsible to the surety bond company for completion of the bonded contract or obligation. A large portion of the surety bonds is expected to expire within the next 12 months; however, Centennial will likely continue to enter into surety bonds for its subsidiaries in the future. At September 30, 2022, approximately $932.4 million of surety bonds were outstanding, which were not reflected on the Consolidated Balance Sheet.

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Variable interest entities

The Company evaluates its arrangements and contracts with other entities to determine if they are VIEs and if so, if the Company is the primary beneficiary.

Fuel Contract Coyote Station entered into a coal supply agreement with Coyote Creek that provides for the purchase of coal necessary to supply the coal requirements of the Coyote Station for the period May 2016 through December 2040. Coal purchased under the coal supply agreement is reflected in inventories on the Consolidated Balance Sheets and is recovered from customers as a component of electric fuel and purchased power.

The coal supply agreement creates a variable interest in Coyote Creek due to the transfer of all operating and economic risk to the Coyote Station owners, as the agreement is structured so that the price of the coal will cover all costs of operations, as well as future reclamation costs. The Coyote Station owners are also providing a guarantee of the value of the assets of Coyote Creek as they would be required to buy the assets at book value should they terminate the contract prior to the end of the contract term and are providing a guarantee of the value of the equity of Coyote Creek in that they are required to buy the entity at the end of the contract term at equity value. Although the Company has determined that Coyote Creek is a VIE, the Company has concluded that it is not the primary beneficiary of Coyote Creek because the authority to direct the activities of the entity is shared by the four unrelated owners of the Coyote Station, with no primary beneficiary existing. As a result, Coyote Creek is not required to be consolidated in the Company's financial statements.

At September 30, 2022, the Company's exposure to loss as a result of the Company's involvement with the VIE, based on the Company's ownership percentage, was $30.0 million.

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

The Company is Building a Strong America® by providing essential infrastructure and services. The Company and its employees work hard to keep the economy of America moving with the products and services provided, which include powering, heating and connecting homes, factories, offices and stores; and building roads, highways, data infrastructure and airports. The Company is authorized to conduct business in nearly every state in the United States and during peak construction season has employed over 16,000 employees. The Company's organic investments are strong drivers of high-quality earnings and continue to be an important part of the Company's growth. Management believes the Company is well positioned in the industries and markets in which it operates.

On August 4, 2022, the Company announced its Board of Directors unanimously approved a plan to pursue a separation of Knife River from the Company. The separation is planned as a tax-free spinoff transaction to the Company’s stockholders for U.S. federal income tax purposes. The transaction is expected to result in two independent, publicly traded and well-capitalized companies. Completion of the separation will be subject to, among other things, the effectiveness of a registration statement on Form 10 with the SEC, final approval from the Company’s Board of Directors, receipt of a tax opinion and a private letter ruling from the IRS, and other customary conditions. The Company may, at any time and for any reason until the proposed transaction is complete, abandon the separation or modify or change its terms. The separation is expected to be complete in 2023, but there can be no assurance regarding the ultimate timing of the separation or that the separation will ultimately occur. See Part II, Item 1A. Risk Factors for a description of some of the risks and uncertainties associated with the proposed transaction.

As the next step of the Company's strategic planning, on November 2, 2022, the Board of Directors unanimously determined the best way to optimize value would be to create two pure-play companies: a leading construction materials company and a regulated energy delivery company. Accordingly, the board has authorized management to commence a strategic review process for MDU Construction Services with the objective of achieving the board’s goal of creating two pure-play public companies. See Part II, Item 1A. Risk Factors for a description of some of the risks and uncertainties with the proposed future structure.

The Company continues to manage the inflationary pressures experienced throughout the United States. Inflation rates in the Unites States have increased significantly, relative to historical precedent, and may continue to rise. The Company has continued to evaluate its businesses and has increased pricing for its products and services where necessary as evidenced by the increase in revenues recognized in 2022. The ability to raise selling prices to cover higher costs due to inflation are subject to customer demand, industry competition and the availability of materials, among other things. Rising interest rates have resulted in and will likely continue to result in higher borrowing costs on new debt, resulting in impacts to the Company's asset valuations and negatively impacting the purchasing power of its customers.

The Company continues to monitor the impact that inflation, rising interest rates, rising commodity prices and supply chain disruptions may have on its businesses and customers and proactively looks for ways to lessen the impact to its businesses. For more information on possible impacts to the Company's businesses, see the Outlook for each segment below and Part I, Item 1A. Risk Factors in the 2021 Annual Report.

Forward-Looking Statements

The following sections contain forward-looking statements within the meaning of Section 21E of the Exchange Act. Forward-looking statements are all statements other than statements of historical fact, including without limitation those statements that are identified by the words "anticipates," "estimates," "expects," "intends," "plans," "predicts" and similar expressions, and include statements concerning plans, trends, objectives, goals, strategies, future events, including the separation of Knife River, or performance, and underlying assumptions (many of which are based, in turn, upon further assumptions) and other statements that are other than statements of historical facts. From time to time, the Company may publish or otherwise make available forward-looking statements of this nature, including statements contained within Business Segment Financial and Operating Data.

Forward-looking statements involve risks and uncertainties, which could cause actual results or outcomes to differ materially from those expressed. The Company's expectations, beliefs and projections are expressed in good faith and are believed by the Company to have a reasonable basis, including without limitation, management's examination of historical operating trends, data contained in the Company's records and other data available from third parties. Nonetheless, the Company's expectations, beliefs or projections may not be achieved or accomplished and changes in such assumptions and factors could cause actual future results to differ materially.

Any forward-looking statement contained in this document speaks only as of the date on which the statement is made, and the Company undertakes no obligation to update any forward-looking statement or statements to reflect events or circumstances that occur after the date on which the statement is made or to reflect the occurrence of unanticipated events, except as required by law. New factors emerge from time to time, and it is not possible for management to predict all the factors, nor can it assess the effect of each factor on the Company's business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statement. All forward-looking statements, whether written or oral and whether made by or on behalf of the Company, are expressly qualified by the risk factors and cautionary statements reported in Part II, Item 1A. Risk Factors in this quarterly report, Part I, Item 1A. Risk Factors in the 2021 Annual Report and subsequent filings with the SEC.

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Consolidated Earnings Overview

The following table summarizes the contribution to the consolidated income by each of the Company's business segments.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In millions, except per share amounts)
Electric	$	21.6	$	20.6	$	37.5	$	41.6
Natural gas distribution	(18.1)		(15.4)		10.8		20.1
Pipeline	9.8		10.6		24.3		28.7
Construction materials and contracting	102.8		96.3		95.3		116.9
Construction services	28.0		23.1		83.8		81.8
Other	3.8		3.8		(1.4)		2.2
Income from continuing operations	147.9		139.0		250.3		291.3
Discontinued operations, net of tax	—		.3		.1		.3
Net income	$	147.9	$	139.3	$	250.4	$	291.6
Earnings per share - basic:
Income from continuing operations	$	.73	$	.68	$	1.23	$	1.44
Discontinued operations, net of tax	—		—		—		—
Earnings per share - basic	$	.73	$	.68	$	1.23	$	1.44
Earnings per share - diluted:
Income from continuing operations	$	.73	$	.68	$	1.23	$	1.44
Discontinued operations, net of tax	—		—		—		—
Earnings per share - diluted	$	.73	$	.68	$	1.23	$	1.44

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 The Company's consolidated earnings increased $8.6 million.

The Company's earnings primarily benefited from earnings at the construction businesses. The construction materials and contracting business benefited from higher average pricing on materials and increased contracting workloads, and the construction services business benefited from higher margins on electrical and mechanical work, primarily in the industrial, institutional and commercial sectors, as well as higher utility margins. Both of the construction business's earnings were negatively impacted by inflationary pressures, including higher diesel fuel and other operating costs; however, these costs are largely being recovered through price increases. Earnings at the electric business were positively impacted by interim rate relief in certain jurisdictions and lower operation and maintenance expenses as a result of the coal-fired electric plant closures and the absence of a planned maintenance outage in 2021. Partially offsetting the increased earnings was an increased seasonal loss at the natural gas distribution business as a result of higher operating expenses, including increased subcontractor costs and depreciation expense, and increased interest expense at the pipeline business as a result of higher debt balances, partially offset by the net benefit of the North Bakken Expansion project. Also negatively impacting results were transaction costs of $4.1 million, after tax, associated with the anticipated spinoff of Knife River included in Other.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 The Company's consolidated earnings decreased $41.2 million.

The Company experienced decreased earnings across most of the Company's businesses. While the construction materials and contracting business experienced higher average pricing on materials and increased contracting workloads, results were negatively impacted by ongoing inflationary pressures, including higher diesel fuel and other operating costs. The natural gas distribution business experienced higher operating expenses, including subcontractor costs, as well as higher depreciation and interest expenses, partially offset by increased sales volumes and approved rate recovery in certain jurisdictions. The pipeline business experienced higher interest expense and lower non-regulated project margins, partially offset by the net benefit of the North Bakken Expansion project. Increased operating costs related to a planned maintenance outage at Coyote Station along with lower per unit average rates decreased earnings at the electric business, partially offset by interim rate relief in certain jurisdictions and higher transmission revenues. The Company's earnings were further impacted by $20.8 million in lower returns on the Company's nonqualified benefit plan investments, as discussed in Note 14, and the transaction costs of $4.1 million, after tax, associated with the anticipated spinoff of Knife River included in Other. Partially offsetting the decreases were increased earnings at the construction services business resulting primarily from higher commercial and service margins and earnings from the Company's joint ventures, partially offset by higher overall operating costs related to inflationary pressures and higher selling, general and administrative expenses.

A discussion of key financial data from the Company's business segments follows.

34

Business Segment Financial and Operating Data

The following sections include key financial and operating data for each of the Company's business segments. Also included are highlights on key growth strategies, projections and certain assumptions for the Company and its subsidiaries and other matters of the Company's business segments.

For information pertinent to various commitments and contingencies, see the Notes to Consolidated Financial Statements. For a summary of the Company's business segments, see Note 17 of the Notes to Consolidated Financial Statements.

Electric and Natural Gas Distribution

Strategy and challenges The electric and natural gas distribution segments provide electric and natural gas distribution services to customers, as discussed in Note 17. Both segments strive to be top performing utility companies measured by integrity, employee safety and satisfaction, customer service and stockholder return. The segments provide safe, reliable, competitively priced and environmentally responsible energy service to customers while focusing on growth and expansion opportunities within and beyond its existing territories. The Company is focused on cultivating organic growth while managing operating costs and monitoring opportunities for these segments to retain, grow and expand their customer base through extensions of existing operations, including building and upgrading electric generation, transmission and distribution, and natural gas systems, and through selected acquisitions of companies and properties with similar operating and growth objectives at prices that will provide stable cash flows and an opportunity to earn a competitive return on investment. The continued efforts to create operational improvements and efficiencies across both segments promotes the Company's business integration strategy. The primary factors that impact the results of these segments are the ability to earn authorized rates of return, cost of natural gas, cost of electric fuel and purchased power, weather, climate change initiatives, competitive factors in the energy industry, population growth and economic conditions in the segments' service areas.

The electric and natural gas distribution segments are subject to extensive regulation in the jurisdictions where they conduct operations with respect to costs, timely recovery of investments and permitted returns on investment. The Company is focused on modernizing utility infrastructure to meet the varied energy needs of both its customers and communities while ensuring the delivery of safe, reliable, affordable and environmentally responsible energy. The segments continue to invest in facility upgrades to be in compliance with existing and known future regulations. To assist in the reduction of regulatory lag in obtaining revenue increases to align with increased investments, tracking mechanisms have been implemented in certain jurisdictions. The Company also seeks rate adjustments for operating costs and capital investments, as well as reasonable returns on investments, not covered by tracking mechanisms. For more information on the Company's tracking mechanisms and recent cases, see Note 19 and the 2021 Annual Report.

These segments are also subject to extensive regulation related to certain operational and environmental compliance, cybersecurity, permit terms and system integrity. Both segments are faced with the ongoing need to actively evaluate cybersecurity processes and procedures related to its transmission and distribution systems for opportunities to further strengthen its cybersecurity protections. Implementation of enhancements and additional requirements is ongoing.

To date, many states have enacted and others are considering, mandatory clean energy standards requiring utilities to meet certain thresholds of renewable and/or carbon-free energy supply. The current presidential administration has made climate change a focus, as further discussed in the Outlook section. Over the long-term, the Company expects overall electric demand to be positively impacted by increased electrification trends, including electric vehicle adoption, as a means to address economy-wide carbon emission concerns and changing customer conservation patterns. MISO and NERC have recently announced concerns with reliability of the electric grid due to capacity shortages, which has resulted from rapid expansion of renewables and rapid reduction of baseload resources such as coal, while load growth has increased faster than expected. MISO has recently approved a seasonal resource adequacy construct, or accreditation process, versus the existing annual summer peak capacity requirement process. The new construct will include a higher planning reserve margin in winter, spring and fall and a higher Coincident Load Factor for Montana-Dakota in the winter season. This is a change from the current summer requirement only process. Both of these will likely require Montana-Dakota to obtain additional accredited seasonal capacity. These changes could result in increased costs to produce electricity; however, the impact of these changes on the Company is unknown. The Company will continue to monitor the progress of these changes and assess the potential impacts they may have on its stakeholders, business processes, results of operations, cash flows and disclosures.

Revenues are impacted by both customer growth and usage, the latter of which is primarily impacted by weather, as well as impacts associated with commercial and industrial slow-downs, including economic recessions, and energy efficiencies. Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among residential and commercial customers. Average consumption among both electric and natural gas customers has tended to decline as more efficient appliances and furnaces are installed, and as the Company has implemented conservation programs. Natural gas weather normalization and decoupling mechanisms in certain jurisdictions have been implemented to largely mitigate the effect that would otherwise be caused by variations in volumes sold to these customers due to weather and changing consumption patterns on the Company's distribution margins.

The Company continues to monitor and work with its manufacturers to reduce the effects of increased pricing and lead times on delivery of certain raw materials and equipment used in electric transmission and distribution system and natural gas pipeline

35

projects. Long lead times are attributable to increased demand for steel products from pipeline companies as they continue pipeline system safety and integrity replacement projects driven by PHMSA regulations, as well as delays in the manufacturing and shipping of electrical equipment as a result of the COVID-19 pandemic and subsequent supply chain issues. While not material, these segments have experienced delays and inflationary pressures, including increased costs related to purchased natural gas and capital expenditures. The Company expects these delays and inflationary pressures to continue throughout the remainder of 2022 and into 2023.

The ability to grow through acquisitions is subject to significant competition and acquisition premiums. In addition, the ability of the segments to grow their service territory and customer base is affected by regulatory constraints, the economic environment of the markets served and competition from other energy providers and fuels. As the industry continues to expand the use of renewable energy sources, the need for additional transmission is growing. On July 25, 2022, as part of its long range transmission plan, MISO announced approval of 18 transmission projects totaling $10.3 billion of investments in MISO's midwest subregion, of which Montana-Dakota is a part. As part of MISO's long range transmission plan, in August 2022, the Company announced its intent to develop, construct and co-own an approximately 95 mile 345 kV transmission line with Otter Tail Power Company in central North Dakota. The construction of new electric generating facilities, transmission lines and other service facilities is subject to increasing costs and lead times, extensive permitting procedures, and federal and state legislative and regulatory initiatives, which may necessitate increases in electric energy prices.

Earnings overview - The following information summarizes the performance of the electric segment.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	99.3	$	99.1	—	%	$	278.6	$	267.7	4	%
Operating expenses:
Electric fuel and purchased power	20.1		19.5		3	%	68.3		56.2		22	%
Operation and maintenance	28.7		31.2		(8)	%	91.0		93.8		(3)	%
Depreciation, depletion and amortization	15.7		17.0		(8)	%	52.0		50.0		4	%
Taxes, other than income	4.4		4.1		7	%	13.5		13.7		(1)	%
Total operating expenses	68.9		71.8		(4)	%	224.8		213.7		5	%
Operating income	30.4		27.3		11	%	53.8		54.0		—	%
Other income (expense)	.5		1.2		(58)	%	(.8)		3.4		(124)	%
Interest expense	7.0		6.6		6	%	21.0		19.8		6	%
Income before income taxes	23.9		21.9		9	%	32.0		37.6		(15)	%
Income tax (benefit) expense	2.3		1.3		77	%	(5.5)		(4.0)		38	%
Net income	$	21.6	$	20.6	5	%	$	37.5	$	41.6	(10)	%

Operating statistics	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Revenues (millions)
Retail sales:
Residential	$	36.6	$	35.4	$	100.6	$	96.0
Commercial	38.4		38.0		105.3		102.5
Industrial	10.8		10.2		31.3		29.9
Other	2.0		1.9		5.4		5.2
	87.8		85.5		242.6		233.6
Transportation and other	11.5		13.6		36.0		34.1
	$	99.3	$	99.1	$	278.6	$	267.7
Volumes (million kWh)
Retail Sales:
Residential	304.9		317.3		906.7		906.3
Commercial	358.3		393.0		1,051.7		1,101.9
Industrial	143.7		145.1		431.7		433.7
Other	21.6		23.8		61.7		65.1
	828.5		879.2		2,451.8		2,507.0
Average cost of electric fuel and purchased power per kWh	$	.022	$	.020	$	.026	$	.020

36

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 Electric earnings increased $1.0 million as a result of:

•Revenue was comparable to the same period in the prior year. Interim rate relief in certain jurisdictions was mostly offset by lower retail sales volumes across all customer classes.

•Electric fuel and purchased power increased $600,000 as a result of increased energy costs, offset in revenue above.

•Operation and maintenance decreased $2.5 million.

◦Largely the result of:

•Decreased payroll-related costs, largely due to lower incentive accruals of $1.2 million and plant closures of $700,000.

•Decreased contract services due to lower transmission expense and the absence of the Big Stone Station outage costs during 2021.

•Depreciation, depletion and amortization decreased $1.3 million.

◦Primarily due to decreased amortization of plant retirement and closure costs of $1.6 million resulting from an extension to the recovery period for these costs, which are recovered in operating revenues, as discussed in Note 13.

◦Partially offset by increased property, plant and equipment balances, primarily as a result of transmission projects placed in service.

•Taxes, other than income were comparable to the same period in the prior year.

•Other income decreased $700,000, primarily resulting from lower returns on the Company's nonqualified benefit plan investments, as discussed in Note 14.

•Interest expense increased $400,000, largely resulting from higher long-term debt balances from debt issued in 2021, partially offset by higher AFUDC largely due to higher rates.

•Income tax expense increased $1.0 million, largely due to higher income before income taxes and lower production tax credits of $400,000 driven by lower wind production.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 Electric earnings decreased $4.1 million as a result of:

•Revenue increased $10.9 million.

◦Largely due to:

•Higher fuel and purchased power costs of $12.1 million recovered in customer rates and offset in expense, as described below.

•Interim rate relief in certain jurisdictions of $2.5 million.

•Higher transmission revenues, primarily from higher net transmission of $2.3 million and higher transmission interconnect upgrades of $500,000.

◦Partially offset by:

•Lower renewable tracker revenues associated with higher production tax credits.

•Lower per unit average rates of $1.9 million related to block rates in certain jurisdictions.

•Electric fuel and purchased power increased $12.1 million.

◦Primarily the result of higher MISO costs as a result of increased energy costs, partially offset by decreased fuel costs associated with the Heskett Station and Lewis & Clark Station plant closures.

•Operation and maintenance decreased $2.8 million.

◦Primarily due to:

•Decreased payroll-related costs, largely due to lower incentive accruals of $2.2 million and plant closures of $2.1 million, as previously discussed.

•Decreased materials costs of $1.2 million as a result of plant closures, as previously discussed.

•Reduced costs from the Heskett Station plant closure and the absence of the Big Stone outage during 2021.

◦Partially offset by increased contract service costs associated with a planned outage at Coyote Station of $2.6 million.

•Depreciation, depletion and amortization increased $2.0 million, primarily due to:

◦Increased amortization of plant retirement and closure costs of $1.2 million recovered in operating revenues, as discussed in Note 13.

◦Increased property, plant and equipment balances placed in service, largely related to growth and replacement projects.

•Taxes, other than income were comparable to the same period in the prior year.

•Other income (expense) decreased $4.2 million, largely lower returns on the Company's nonqualified benefit plan investments of $4.4 million, as discussed in Note 14, partially offset by higher AFUDC largely due to higher rates.

37

•Interest expense increased $1.2 million, largely resulting from higher long-term debt balances from debt issued in 2021, partially offset by higher AFUDC largely due to higher rates.

•Income tax benefit increased $1.5 million.

◦Largely due to:

•Higher production tax credits of $1.5 million driven by higher wind production.

•Lower income before income taxes.

◦Partially offset by permanent tax adjustments and excess deferred tax amortization of $700,000.

Earnings overview - The following information summarizes the performance of the natural gas distribution segment.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	132.2	$	110.5	20	%	$	793.3	$	614.8	29	%
Operating expenses:
Purchased natural gas sold	65.3		44.9		45	%	481.3		318.0		51	%
Operation and maintenance	49.5		47.7		4	%	154.4		145.0		6	%
Depreciation, depletion and amortization	22.7		21.5		6	%	67.4		64.2		5	%
Taxes, other than income	11.4		10.6		8	%	51.3		44.7		15	%
Total operating expenses	148.9		124.7		19	%	754.4		571.9		32	%
Operating income (loss)	(16.7)		(14.2)		18	%	38.9		42.9		(9)	%
Other income	1.4		1.3		8	%	.3		5.4		(94)	%
Interest expense	10.7		9.3		15	%	29.8		27.6		8	%
Income (loss) before income taxes	(26.0)		(22.2)		17	%	9.4		20.7		(55)	%
Income tax (benefit) expense	(7.9)		(6.8)		16	%	(1.4)		.6		(333)	%
Net income (loss)	$	(18.1)	$	(15.4)	17	%	$	10.8	$	20.1	(46)	%

Operating statistics	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Revenues (millions)
Retail sales:
Residential	$	64.9	$	55.3	$	438.5	$	344.0
Commercial	44.5		35.6		278.3		204.5
Industrial	7.2		5.4		29.2		20.5
	116.6		96.3		746.0		569.0
Transportation and other	15.6		14.2		47.3		45.8
	$	132.2	$	110.5	$	793.3	$	614.8
Volumes (MMdk)
Retail sales:
Residential	4.5		4.5		47.3		42.3
Commercial	4.2		4.2		32.9		29.3
Industrial	.9		.9		3.9		3.5
	9.6		9.6		84.1		75.1
Transportation sales:
Commercial	.3		.2		1.4		1.3
Industrial	42.1		44.7		118.0		127.5
	42.4		44.9		119.4		128.8
Total throughput	52.0		54.5		203.5		203.9
Average cost of natural gas per dk	$	6.82	$	4.72	$	5.72	$	4.24

38

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 Natural gas distribution's seasonal loss increased $2.7 million as a result of:

•Operating revenues increased $21.7 million, largely resulting from:

◦Higher purchased natural gas sold of $19.5 million recovered in customer rates that was offset in expense, as described below.

◦Higher weather normalization and decoupling mechanisms of $2.6 million in certain jurisdictions.

•Purchased natural gas sold increased $20.4 million, primarily due to higher natural gas costs as a result of higher market prices, including the higher recovery of purchased gas adjustments related to the February 2021 cold weather event and the 2018 Enbridge pipeline rupture. Purchased natural gas sold includes the disallowance of $845,000 ordered by MNPUC, as discussed in Note 19.

•Operation and maintenance increased $1.8 million largely resulting from higher subcontractor costs.

•Depreciation, depletion and amortization increased $1.2 million, primarily resulting from increased property, plant and equipment balances from growth and replacement projects placed in service.

•Taxes, other than income increased $800,000, largely from higher revenue-based taxes which are recovered in rates.

•Other income was comparable to the same period in the prior year. Lower returns on the Company's nonqualified benefit plan investments were largely offset by higher interest income.

•Interest expense increased $1.4 million, primarily due to higher long-term debt balances from debt issued in 2022 and 2021 and higher interest rates, partially offset by higher AFUDC of $400,000.

•Income tax benefit increased $1.1 million as a result of an increased seasonal loss.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 Natural gas distribution's earnings decreased $9.3 million as a result of:

•Operating revenues increased $178.5 million, largely resulting from:

◦Higher purchased natural gas sold of $162.4 million recovered in customer rates that was offset in expense, as described below.

◦Higher retail sales volumes of approximately 12.0 percent across all customer classes due to colder weather, partially offset by weather normalization and decoupling mechanisms in certain jurisdictions.

◦Higher revenue-based taxes recovered in rates of $6.4 million that were offset in expense, as described below.

◦Higher pipeline replacement mechanisms of $1.3 million, as well as approved rate relief of $1.2 million.

•Purchased natural gas sold increased $163.3 million, primarily due to:

◦Higher natural gas costs as a result of higher market prices of $125.1 million, including the higher recovery of purchased gas adjustments related to the February 2021 cold weather event and the 2018 Enbridge pipeline rupture.

◦Higher volumes of natural gas purchased.

•Operation and maintenance increased $9.4 million.

◦Primarily due to:

•Higher contract services of $4.5 million, primarily higher subcontractor costs.

•Higher software costs of $1.7 million.

•Higher other costs, partially resulting from inflation, including vehicle fuel costs of $800,000; higher bad debt expense of $700,000; and higher office, travel, materials, and other miscellaneous employee costs.

•Depreciation, depletion and amortization increased $3.2 million from increased property, plant and equipment balances from growth and replacement projects placed in service.

•Taxes, other than income increased $6.6 million resulting from higher revenue-based taxes which are recovered in rates.

•Other income decreased $5.1 million, primarily the result of lower returns on the Company's nonqualified benefit plan investments of $6.8 million, as discussed in Note 14, partially offset by increased interest income.

•Interest expense increased $2.2 million, primarily due to higher long-term debt balances from debt issued in 2022 and 2021 and higher interest rates, partially offset by higher AFUDC.

•Income tax (benefit) expense decreased $2.0 million, largely the result of lower income before income taxes.

39

Outlook The Company expects these segments will grow rate base by approximately 5 percent annually over the next five years on a compound basis. Operations are spread across eight states where the Company expects customer growth to be higher than the national average. The Company expects customer growth to continue to average 1 percent to 2 percent per year and as of September 30, 2022, these segments experienced retail customer growth of approximately 1.6 percent. This customer growth, along with system upgrades and replacements needed to supply safe and reliable service, will require investments in new and replacement electric and natural gas systems.

These segments are exposed to energy price volatility and may be impacted by changes in oil and natural gas exploration and production activity. Rate schedules in the jurisdictions in which the Company's natural gas distribution segment operates contain clauses that permit the Company to file for rate adjustments for changes in the cost of purchased natural gas. Although changes in the price of natural gas are passed through to customers and have minimal impact on the Company's earnings, the natural gas distribution segment's customers benefit from lower natural gas prices through the Company's utilization of storage and fixed price contracts. During the last half of 2021 and in 2022, the Company experienced increased natural gas prices and expects this trend to continue through the next winter heating season due to the increase in demand outpacing the supply along with the impact of global events. As a result, the Company filed an out-of-cycle cost of gas adjustment in Idaho to assist in the timely recovery of these costs. The Company will continue to monitor natural gas prices, as well as oil and natural gas production levels.

In February 2019, the Company announced the retirement of three aging coal-fired electric generating units. The Company ceased operations of Unit 1 at Lewis & Clark Station in Sidney, Montana, in March 2021 and Units 1 and 2 at Heskett Station near Mandan, North Dakota, in February 2022. In addition, in May 2022 the Company began construction of Heskett Unit 4, an 88-MW simple-cycle natural gas-fired combustion turbine peaking unit at the existing Heskett Station near Mandan, North Dakota, with an expected in service date in the first half of 2023.

The Company is one of four owners of Coyote Station and cannot make a unilateral decision on the plant's future; therefore, the Company could be negatively impacted by decisions of the other owners. In September 2021, Otter Tail Power Company filed its 2022 Integrated Resource Plan in Minnesota and North Dakota, which included its intent to start the process of withdrawal from its 35 percent ownership interest in Coyote Station with an anticipated exit from the plant by December 31, 2028. In October 2022, Otter Tail Power Company requested permission from the MNPUC to extend the deadline for its Integrated Resource Plan with the intent to update its modeling in light of recent developments in the industry, including capacity requirements in MISO. The joint owners continue to collaborate in analyzing data and weighing decisions that impact the plant and its employees as well as each company's customers and communities served. Further state implementation of pollution control plans to improve visibility at Class I areas, such as national parks, under the EPA's Regional Haze Rule could require the owners of Coyote Station to incur significant new costs. If the owners decide to incur such costs, the costs could, dependent on determination by state regulatory commissions on approval to recover such costs from customers, negatively impact the Company's results of operations, financial position and cash flows. The NDDEQ submitted their state implementation plan to the EPA in August 2022 and expects a decision on the plan sometime in 2023. The plan, as submitted by the NDDEQ, does not require additional controls for any units in North Dakota, including Coyote Station.

Legislation and rulemaking The Company continues to monitor legislation and rulemaking related to clean energy standards that may impact its segments. Below are some of the specific legislative actions the Company is monitoring.

•The current presidential administration is considering changes to the federal Clean Air Act, some of which were amended by the previous presidential administration. The content and impacts of the changes under consideration are uncertain and the Company continues to monitor for potential actions by the EPA.

•In Oregon, the Climate Protection Program Rule was approved in December 2021, which requires natural gas companies to reduce GHG emissions 50 percent below the baseline by 2035 and 90 percent below the baseline by 2050, which may be achieved through surrendering emissions allowances, investing in additional customer conservation and energy efficiency programs, purchasing community climate investment credits, and purchasing low carbon fuels such as renewable natural gas. The Company expects the compliance costs for these regulations to be recovered through customer rates. On September 30, 2022, the Company filed a request for the use of deferred accounting for costs related to the rule and will begin deferring those costs. The Company, along with the other two local natural gas distribution companies in Oregon, filed a lawsuit on March 18, 2022, challenging the Climate Protection Program Rule. The lawsuit was filed on behalf of customers as the Company does not believe the rule accomplishes environmental stewardship in the most effective and affordable way possible.

•In Washington, the Climate Commitment Act signed into law in May 2021 requires natural gas distribution companies to reduce overall GHG emissions 45 percent below 1990 levels by 2030, 70 percent below 1990 levels by 2040 and 95 percent below 1990 levels by 2050, which may be achieved through increased energy efficiency and conservation measures, purchased emission allowances and offsets, and purchases of low carbon fuels. As directed by the Climate Commitment Act, in September 2022 the Washington DOE published its final rule on the Climate Commitment Program. The rule is effective on October 30, 2022, and emissions compliance begins on January 1, 2023. The Company has begun reviewing compliance options and expects the compliance costs for these regulations will be recovered through customer rates. On October 14, 2022, the Company filed a request for the use of deferred accounting for costs related to the rule and will begin deferring those costs.

•On April 22, 2022, the Washington State Building Code Council approved revisions to the state's commercial energy code that will significantly limit the use of natural gas for space and water heating in new and retrofitted commercial and multifamily buildings and proposed the review of similar restrictions in the future for residential buildings. The Company is currently assessing the impact of these revisions.

40

•The Company has reviewed the income tax provisions of the IRA signed into law in August 2022 and does not expect any material income tax benefits as a result. The Company will continue to explore whether any of the new or renewed energy tax credits will provide a benefit.

Pipeline

Strategy and challenges The pipeline segment provides natural gas transportation, underground storage and energy-related services, as discussed in Note 17. The segment focuses on utilizing its extensive expertise in the design, construction and operation of energy infrastructure and related services to increase market share and profitability through optimization of existing operations, organic growth and investments in energy-related assets within or in close proximity to its current operating areas. The segment focuses on the continual safety and reliability of its systems, which entails building, operating and maintaining safe natural gas pipelines and facilities. The segment continues to evaluate growth opportunities including the expansion of natural gas facilities; incremental pipeline projects; and expansion of energy-related services leveraging on its core competencies. In support of this strategy, the North Bakken Expansion project in western North Dakota was placed in service in February of 2022. The project has capacity to transport 250 MMcf of natural gas per day and can be increased to 625 MMcf per day with additional compression. In addition, the Line Section 7 Expansion project was placed in service in August of 2022 and increased system capacity by 6.7 MMcf per day.

The segment is exposed to energy price volatility which is impacted by the fluctuations in pricing, production and basis differentials of the energy market's commodities. Legislative and regulatory initiatives on increased pipeline safety regulations and environmental matters such as the reduction of methane emissions could also impact the price and demand for natural gas.

The pipeline segment is subject to extensive regulation related to certain operational and environmental compliance, cybersecurity, permit terms and system integrity. The Company continues to actively evaluate cybersecurity processes and procedures, including changes in the industry's cybersecurity regulations, for opportunities to further strengthen its cybersecurity protections. Implementation of enhancements and additional requirements is ongoing. The segment reviews and secures existing permits and easements, as well as new permits and easements as necessary, to meet current demand and future growth opportunities on an ongoing basis. Groups opposing natural gas pipelines could also cause negative impacts on the segment with increased costs, potential delays to project completion or cancellation of prospective projects.

The Company is actively managing the national supply chain challenges and inflationary costs including working with its manufacturers and suppliers to help mitigate some of these risks on its business. The segment regularly experiences extended lead times on raw materials that are critical to the segment's construction and maintenance work which could delay maintenance work and construction projects potentially causing lost revenues and/or increased costs. The segment is also currently experiencing increased fuel and raw material costs, as well as other inflationary pressures. The Company expects supply chain challenges and inflationary pressures to continue throughout the remainder of 2022 and into 2023.

The segment focuses on the recruitment and retention of a skilled workforce to remain competitive and provide services to its customers. The industry in which it operates relies on a skilled workforce to construct energy infrastructure and operate existing infrastructure in a safe manner. A shortage of skilled personnel can create a competitive labor market which could increase costs incurred by the segment. Competition from other pipeline companies can also have a negative impact on the segment.

Earnings overview - The following information summarizes the performance of the pipeline segment.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	39.7	$	34.9	14	%	$	114.3	$	106.7	7	%
Operating expenses:
Operation and maintenance	14.6		14.2		3	%	44.9		45.5		(1)	%
Depreciation, depletion and amortization	6.9		5.2		33	%	20.0		15.5		29	%
Taxes, other than income	3.2		3.2		—	%	10.0		9.8		2	%
Total operating expenses	24.7		22.6		9	%	74.9		70.8		6	%
Operating income	15.0		12.3		22	%	39.4		35.9		10	%
Other income	.6		2.8		(79)	%	—		5.6		(100)	%
Interest expense	3.0		1.7		76	%	8.1		5.6		45	%
Income before income taxes	12.6		13.4		(6)	%	31.3		35.9		(13)	%
Income tax expense	2.8		2.8		—	%	7.0		7.2		(3)	%
Net income	$	9.8	$	10.6	(7)	%	$	24.3	$	28.7	(15)	%

41

Operating statistics	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2022	2021	2022	2021
Transportation volumes (MMdk)	130.9	122.0	357.1	351.5
Customer natural gas storage balance (MMdk):
Beginning of period	14.8	16.0	23.0	25.5
Net injections	13.3	12.8	5.1	3.3
End of period	28.1	28.8	28.1	28.8

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 Pipeline earnings decreased $800,000 as a result of:

•Revenues increased $4.8 million, primarily driven by increased transportation volume revenues, largely due to the North Bakken Expansion project placed in service in February 2022.

•Operation and maintenance increased $400,000 primarily from higher contract services costs, non-regulated project costs and materials, partially offset by lower payroll-related costs largely due to lower incentive accruals.

•Depreciation, depletion and amortization increased $1.7 million due to increased property, plant and equipment balances, largely related to the North Bakken Expansion project.

•Taxes, other than income were comparable to the same period in the prior year.

•Other income decreased $2.2 million, driven primarily by lower AFUDC as a result of the completion of the North Bakken Expansion project placed in service in February 2022.

•Interest expense increased $1.3 million, primarily from higher debt balances to fund capital expenditures and lower AFUDC as a result of the completion of the North Bakken Expansion project placed in service in February 2022.

•Income tax expense was comparable to the same period in the prior year.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 Pipeline earnings decreased $4.4 million as a result of:

•Revenues increased $7.6 million.

◦Driven by increased transportation volume revenues of $11.8 million, largely due to the North Bakken Expansion project placed in service in February 2022.

◦Partially offset by:

•Lower non-regulated project revenues of $2.5 million.

•Lower storage-related revenues of $900,000.

•Lower transmission rates, due to expired negotiated contracts converted to tariff rate.

•Operation and maintenance decreased $600,000.

◦Primarily due to:

•Lower payroll-related costs of $1.7 million, largely related to lower incentive accruals.

•Lower non-regulated project costs of $1.5 million directly associated with lower non-regulated project revenues, as previously discussed.

◦Partially offset by higher contract services, materials and legal costs.

•Depreciation, depletion and amortization increased $4.5 million due to increased property, plant and equipment balances, largely related to the North Bakken Expansion project.

•Taxes, other than income were comparable to the same period in the prior year.

•Other income decreased $5.6 million, resulting from:

◦Lower AFUDC of $3.7 million as a result of the completion of the North Bakken Expansion project placed in service in February 2022.

◦Lower returns on the Company's nonqualified benefit plan investments, as discussed in Note 14.

•Interest expense increased $2.5 million, primarily due to interest associated with higher debt balances to fund capital expenditures and lower AFUDC as a result of the North Bakken Expansion project placed in service in February 2022.

•Income tax expense was comparable to the same period in the prior year.

42

Outlook On February 18, 2022, the FERC issued two policy statements regarding the certification of new interstate natural gas facilities. The two policy statements were subsequently converted to draft policy statements by the FERC on March 24, 2022. The first draft policy statement, the Updated Certificate Policy Statement, describes how the FERC will determine whether a new interstate natural gas transportation project is required by public convenience and necessity. It includes increased focus on a project's purpose and need and the environmental impacts; as well as impacts on landowners and environmental justice communities. The FERC also clarified the updated policy statement will not apply to projects that have been filed with the FERC prior to the policy statement being finalized. The second draft policy statement, the Interim GHG Policy Statement, explains how the FERC will assess the impacts of natural gas infrastructure projects on climate change in its reviews under the National Environmental Policy Act and Natural Gas Act. The FERC invited public comment on the draft policy statements which were due April 25, 2022. The Company continues to monitor and assess these initiatives and the potential impacts they may have on its business processes, current and future projects, results of operations and disclosures.

The Company has reviewed the income tax provisions of the IRA signed into law in August 2022 and does not expect any material income tax benefits as a result. The Company has also evaluated the impacts of the methane emissions charge imposed under the IRA legislation and does not expect any material fees given the current GHG reporting thresholds. The Company continues to monitor, evaluate and implement additional GHG emissions reduction strategies, including increased monitoring frequency and emission source control technologies to minimize potential risk.

The Company has continued to experience the effect of associated natural gas production in the Bakken, which has provided opportunities for organic growth projects and increased demand. The completion of organic growth projects has contributed to higher volumes of natural gas the Company transports through its system. Associated natural gas production in the Bakken fell during the pandemic delaying previously forecasted production growth. Natural gas production has rebounded to pre-pandemic levels and drilling rig activity continues to increase. The production delay along with long-term contractual commitments on the North Bakken Expansion project placed in service in the first quarter of 2022 has negatively impacted customer renewals of certain contracts. Bakken natural gas production outlook remains positive with continued growth expected due to new oil wells and increasing gas to oil ratios.

The low levels of natural gas in storage nationally, which continue to trend below the five-year average, along with global events, has put upward pressure on natural gas prices and increased volatility. While the Company believes there will continue to be varying pressures on natural gas production levels and prices, the long-term outlook for natural gas prices continues to provide growth opportunity for industrial supply-related projects and seasonal pricing differentials provide opportunities for storage services.

The Company continues to focus on improving existing operations and growth opportunities through organic projects in all areas in which it operates, which includes additional projects with local distribution companies and industrial customers in various stages of development.

In July 2021, the Company announced plans for a natural gas pipeline expansion project in eastern North Dakota. The Wahpeton Expansion project consists of 60 miles of pipe and ancillary facilities and is designed to increase capacity by 20 MMcf per day, which is supported by long-term customer agreements with Montana-Dakota and its utility customers. Construction is expected to begin in early 2024, depending on regulatory approvals, with an anticipated completion date later in 2024. On May 27, 2022, the Company filed with FERC its application for this project.

On September 19, 2022, the Company filed with the FERC its prior notice application for its 2023 Line Section 27 Expansion project. This project consists of a new compressor station and ancillary facilities and is designed to increase capacity by 175 MMcf per day, which is supported by a long-term customer agreement. Construction is expected to begin in early 2023, pending regulatory approvals, with an anticipated completion date in late 2023.

In addition to the Wahpeton Expansion and 2023 Line Section 27 Expansion projects, the Company has also entered into long-term customer agreements for the construction of two additional growth projects, which are dependent on regulatory approvals and anticipated to be completed in 2023. Estimated capital expenditures for these projects is approximately $65 million and is included in the pipeline segment's estimated capital expenditures for 2022 and 2023. The projects are anticipated to add total incremental system capacity of 119 MMcf per day.

Construction Materials and Contracting

Strategy and challenges The construction materials and contracting segment provides an integrated set of aggregate-based services, as discussed in Note 17. The segment focuses on high-growth strategic markets located near major transportation corridors and desirable mid-sized metropolitan areas; strengthening the long-term, strategic aggregate reserve position through available purchase and/or lease opportunities; enhancing profitability through cost containment, margin discipline and vertical integration of the segment's operations; development and recruitment of talented employees; and continued growth through organic and strategic acquisition opportunities.

A key element of the Company's long-term strategy for this business is to further expand its market presence in the higher-margin materials business (rock, sand, gravel, ready-mix concrete, asphalt concrete and related products), complementing and expanding on the segment's expertise. The Company's continued acquisition activity supports this strategy.

43

As one of the country's largest sand and gravel producers, the segment continues to strategically manage its aggregate reserves, as well as take further advantage of being vertically integrated. The segment's vertical integration allows it to manage operations from aggregate mining to final lay-down of concrete and asphalt, with control of and access to permitted aggregate reserves being significant. The Company's aggregate reserves are naturally declining and, as a result, the Company seeks acquisition opportunities to replace the reserves.

The segment's management continually monitors its operating margins and has been proactive in addressing the inflationary impacts seen across the United States. The Company has increased its product pricing where necessary to mitigate the effects on the segment's gross margin. Due to existing contractual provisions, there can be a lag between the announced price increases and the time when they can be fully recognized. The Company will continue to evaluate future price increases on a regular cadence to keep pace with inflationary pressures as they are expected to continue throughout the remainder of 2022 and into 2023.

The segment operates in geographically diverse and competitive markets that can put negative pressure on the segment's operating margins. The segment's margins can also be impacted by volatility in the cost of raw materials such as diesel fuel, gasoline, asphalt oil, cement and steel, with diesel fuel and asphalt oil costs having the most significant impact on the segment's recent results. Such volatility and inflationary pressures may continue to have an impact on the segment's margins, including fixed-price construction contracts that are particularly vulnerable to the volatility of energy and material prices. While the Company has experienced some supply chain constraints, the Company has good relationships with its suppliers and has not experienced significant shortages or delays on materials or experienced any material adverse impacts to its results of operations. Other variables that can impact the segment's margins include adverse weather conditions, the timing of project starts or completions and declines or delays in new and existing projects due to the cyclical nature of the construction industry and governmental infrastructure spending. Accordingly, operating results in any particular period may not be indicative of the results that can be expected for any other period.

As a people first company, the segment continually takes steps to address the challenge of recruitment and retention of employees. In order to help attract new workers to the construction industry and enhance the skills of its current employees, the Company has completed construction of a corporate-wide state-of-the-art training center located in the Pacific Northwest. The training facility offers hands-on training for heavy equipment operators and truck drivers, as well as leadership and safety training. Trends in the labor market include an aging workforce and availability issues, and most of the markets the segment operates in have experienced labor shortages, largely truck drivers, causing increased labor-related costs and delays or inefficiencies on projects. The new training facility is expected to help address some of these challenges. The Company continues to monitor the labor markets and assess additional opportunities to enhance and support its workforce. Despite these efforts, the Company expects labor costs to continue to increase based on the increased demand for services and, to a lesser extent, the recent escalated inflationary environment in the United States.

Earnings overview - The following information summarizes the performance of the construction materials and contracting segment.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	975.4	$	831.3	17	%	$	1,997.2	$	1,730.8	15	%
Cost of sales:
Operation and maintenance	758.7		636.3		19	%	1,633.9		1,376.5		19	%
Depreciation, depletion and amortization	29.2		24.5		19	%	84.9		71.1		19	%
Taxes, other than income	15.3		13.9		10	%	41.3		37.6		10	%
Total cost of sales	803.2		674.7		19	%	1,760.1		1,485.2		19	%
Gross margin	172.2		156.6		10	%	237.1		245.6		(3)	%
Selling, general and administrative expense:
Operation and maintenance	22.9		20.9		10	%	71.6		66.8		7	%
Depreciation, depletion and amortization	1.2		1.0		20	%	3.7		3.1		19	%
Taxes, other than income	.7		1.0		(30)	%	4.7		4.4		7	%
Total selling, general and administrative expense	24.8		22.9		8	%	80.0		74.3		8	%
Operating income	147.4		133.7		10	%	157.1		171.3		(8)	%
Other income (expense)	(1.3)		(.3)		333	%	(6.1)		.8		(863)	%
Interest expense	8.8		4.8		83	%	21.5		14.4		49	%
Income before income taxes	137.3		128.6		7	%	129.5		157.7		(18)	%
Income tax expense	34.5		32.3		7	%	34.2		40.8		(16)	%
Net income	$	102.8	$	96.3	7	%	$	95.3	$	116.9	(18)	%

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Operating statistics	Revenues								Gross margin
	Three Months Ended				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
	2022		2021		2022		2021		2022		2021		2022		2021
	(In millions)
Aggregates	$	171.8	$	144.2	$	385.8	$	339.7	$	34.4	$	28.9	$	50.2	$	43.7
Asphalt	205.5		153.1		345.2		268.9		28.1		24.7		32.5		33.4
Ready-mix concrete	198.9		182.4		475.5		446.2		29.8		25.1		54.1		50.7
Other products*	166.7		138.1		328.5		278.1		44.3		43.3		42.7		55.7
Contracting services	492.2		415.1		937.2		792.0		35.6		34.6		57.6		62.1
Intracompany eliminations	(259.7)		(201.6)		(475.0)		(394.1)		—		—		—		—
	$	975.4	$	831.3	$	1,997.2	$	1,730.8	$	172.2	$	156.6	$	237.1	$	245.6

*Other products includes cement, asphalt oil, merchandise, fabric, spreading and other products that individually are not considered to be a major line of business for the segment.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Sales (thousands):
Aggregates (tons)	12,399		11,346		26,890		25,687
Asphalt (tons)	3,550		3,290		5,967		5,675
Ready-mix concrete (cubic yards)	1,306		1,350		3,179		3,283
Average selling price:
Aggregates (per ton)	$	13.86	$	12.71	$	14.35	$	13.22
Asphalt (per ton)	$	57.90	$	46.55	$	57.85	$	47.38
Ready-mix concrete (per cubic yard)	$	152.34	$	135.10	$	149.59	$	135.93

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 Construction materials and contracting's earnings increased $6.5 million as a result of:

•Revenues increased $144.1 million.

◦Primarily the result of increased revenues across all product lines.

•The Company benefited from higher average selling prices of nearly $100 million across all product lines. Also positively impacting materials revenues were:

◦Increased aggregates sales volumes due to additional revenue from recent acquisitions, including the benefit of approximately 700,000 tons, and higher volumes in certain markets as a result of higher demand.

◦Increased asphalt sales volumes, largely from higher demand due to more available public work in Minnesota of 198,000 tons and Montana and Wyoming of 82,000 tons. Also contributing was higher sales volumes due to the recent acquisitions, which contributed an additional 76,000 tons.

◦Partially offsetting these increases were lower ready-mix sales volumes as a result of lower demand in certain regions.

•Increased contracting revenues due to more available work, strong demand in some regions and revenue from recent acquisitions of $15.8 million.

◦Partially offset by:

•An increase in internal materials sales used in other product lines and contracting services provided.

•Gross margin increased $15.6 million, directly resulting from the higher revenues previously discussed, partially offset by higher operating costs across the business primarily as a result of inflationary pressures, including diesel fuel costs of $12.9 million and higher labor, materials, equipment and production costs.

•Selling, general and administrative expense increased $1.9 million as a result of increased payroll-related costs, partially resulting from inflationary pressures.

•Other expense increased $1.0 million due to lower returns on the Company's nonqualified benefit plan investments, as discussed in Note 14.

•Interest expense increased $4.0 million, largely the result of higher debt balances, largely to fund recent acquisitions and higher working capital needs, and higher average interest rates.

•Income tax expense increased $2.2 million, largely due to higher income before income taxes.

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Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 Construction materials and contracting's earnings decreased $21.6 million as a result of:

•Revenues increased $266.4 million.

◦Primarily the result of increased revenues across all product lines.

•The Company benefited from higher average selling prices of nearly $175 million across all product lines. Also impacting materials revenues were:

◦Increased asphalt sales volumes of 294,000 tons from recent acquisitions.

◦Increased aggregate sales volumes of 1.7 million tons from recent acquisitions. Also contributing was strong market demand in Idaho and Montana.

◦Increased other revenues from other retail and cement revenues.

◦Lower ready-mix concrete sales volumes in Oregon, Hawaii and Alaska due to the decreased demand and the absence of certain large projects, and higher delivery costs in South Dakota.

•Increased contracting revenue across all regions as a result of more available work and increased pricing related to inflationary costs, as well as revenues from recent acquisitions.

◦These increases were partially offset by:

•An increase in internal materials sales used in other product lines and contracting services provided.

•Gross margin decreased $8.5 million.

◦Primarily the result of higher operating costs across the business primarily as a result of inflationary pressures, including diesel fuel costs of $30.9 million and higher labor, materials, repair and maintenance, equipment, delivery and production costs. In addition, contracting services margins decreased from the mix of work and project delays.

◦Partially offset by increased margins for aggregates and ready-mix as a result of the increased revenues previously discussed.

•Selling, general and administrative expense increased $5.7 million, largely due to:

◦Increased payroll-related costs of $2.9 million, partially resulting from inflationary pressures.

◦Higher professional fees of $800,000, partially due to increased audit fees and acquisition-related costs.

◦Lower recovery of bad debt expense of $800,000.

◦Higher depreciation and amortization of $600,000, primarily due to the completion of the training center.

◦Increased technology expenses.

•Other income (expense) decreased $6.9 million, mainly due to lower returns on the Company's nonqualified benefit plan investments, as discussed in Note 14.

•Interest expense increased $7.1 million, largely the result of higher debt balances to fund recent acquisitions and higher working capital needs.

•Income tax expense decreased $6.6 million, largely due to lower income before income taxes.

Outlook In August 2022, the Company announced its intent to separate this segment into a standalone publicly traded company. The separation is expected to result in two independent, publicly traded companies: (1) MDU Resources Group, Inc., the existing company and (2) Knife River, a construction materials and contracting company. The separation is expected to be completed in 2023 and is expected to unlock the inherent value within the two companies, which each have unique growth prospects and investment opportunities.

The American Rescue Plan Act enacted in the first quarter of 2021 provides $1.9 trillion in COVID-19 relief funding for states, schools and local governments. States are beginning to move forward with allocating these funds based on federal criteria and state needs, and in some cases, funding of infrastructure projects could positively impact the segment. Additionally, the bipartisan infrastructure proposal, known as the Infrastructure Investment and Jobs Act, was enacted in the fourth quarter of 2021. This initiative is providing long-term opportunities by designating $119 billion for the repair and rebuilding of roads and bridges across the Company's footprint. In addition, the IRA provides $369 billion in new funding for clean energy programs. These programs include new tax incentives for solar, battery storage and hydrogen development along with funding to expand the production of electric vehicles and the build out of infrastructure to support electric vehicles. In addition to federal funding, 13 out of the 14 of the states in which the Company operates have implemented their own funding mechanisms for public projects, including projects related to highways, airports and other public infrastructure. The Company continues to monitor the implementation of these legislative items.

The segment's vertically integrated aggregates-based business model provides the Company with the ability to capture margin throughout the sales delivery process. The aggregate products are sold internally and externally for use in other products such as ready-mix concrete, asphaltic concrete and public and private construction markets. The contracting services and construction materials are sold in connection with street, highway and other public infrastructure projects, as well as private commercial, industrial and residential development projects. The public infrastructure projects have traditionally been more stable markets as public funding is more secure during periods of economic decline. The public projects are, however, dependent on federal and state funding such as appropriations to the Federal Highway Administration. Spending on private development is highly dependent on both local and national economic cycles, providing additional sales during times of strong economic cycles and potential for reductions during times of inflation or supply shortages.

46

During 2021, the Company made strategic purchases and completed acquisitions that support the Company's long-term strategy to expand its market presence in the higher-margin materials markets. The Company continues to evaluate additional acquisition opportunities. For more information on the Company's business combinations, see Note 10. In 2022, the Company is also upgrading its prestress facility located in Spokane, Washington. The state of the art facility is expected to be in service in December 2022. The facility is expected be a platform for growth through improved productivity and quality, which will help meet strong market demand for prefabricated concrete solutions.

The construction materials and contracting segment's backlog remained strong at September 30, 2022, at $895.0 million, as compared to backlog of $651.7 million at September 30, 2021. A significant portion of the Company's backlog relates to publicly funded projects, largely street and highway construction projects. Period over period increases or decreases in backlog cannot be used as an indicator of future revenues or net income. Of the $895.0 million of backlog at September 30, 2022, the Company expects to complete an estimated $820.5 million during the next 12 months. While the Company believes the current backlog of work remains firm, prolonged delays in the receipt of critical supplies and materials or continued increases to pricing could result in customers seeking to delay or terminate existing or pending agreements. Factors noted in Part I, Item 1A. Risk Factors in the 2021 Annual Report can cause revenues to be realized in periods and at levels that are different from originally projected.

The labor contracts that the construction materials and contracting segment was negotiating at December 31, 2021, as reported in Items 1 and 2 - Business Properties - General in the 2021 Annual Report, have been ratified.

Construction Services

Strategy and challenges The construction services segment provides electrical and mechanical and transmission and distribution specialty contracting services, as discussed in Note 17. The construction services segment focuses on safely executing projects; providing a superior return on investment by building new and strengthening existing customer relationships; ensuring quality service; effectively controlling costs; retaining, developing and recruiting talented employees; growing through organic and strategic acquisition opportunities; and focusing efforts on projects that will permit higher margins while properly managing risk. The growth experienced by the segment in recent years is due in part to its ability to support national customers in most of the regions in which it operates.

The construction services segment faces challenges, which are not under direct control of the business, in competitive markets in which it operates, including those described in Part I, Item 1A. Risk Factors in the 2021 Annual Report. These factors, and those noted below, have caused fluctuations in revenues, gross margins and earnings in the past and are likely to cause fluctuations in the future.

•Revenue mix and impact on margins. The mix of revenues based on the types of services the segment provides can impact margins as certain industries and services provide higher margin opportunities. Larger or more complex projects typically result in higher margin opportunities since the segment assumes a higher degree of performance risk and there is greater utilization of the segment's resources for longer construction timelines. However, larger or more complex projects have a higher risk of regulatory and seasonal or cyclical delay. Project schedules fluctuate, which can affect the amount of work performed in a given period. Smaller or less complex projects typically have a greater number of companies competing for them, and competitors at times may be more aggressive when pursuing available work. A greater percentage of smaller scale or less complex work in a given period could negatively impact margins due to the inefficiency of transitioning between a greater number of smaller projects versus continuous production on a few larger projects.

•Project variability and performance. Margins for a single project may fluctuate period to period due to changes in the volume or type of work performed, the pricing structure under the project contract or job productivity. Productivity and performance on a project can vary period to period based on a number of factors, including unexpected project difficulties; unexpected project site conditions; project location, including locations with challenging operating conditions or difficult geographic characteristics; whether the work is on an open or encumbered right of way; inclement weather or severe weather events; environmental restrictions or regulatory delays; political or legal challenges related to a project; and the performance of third parties. In addition, the type of contract can impact the margin on a project. Under fixed-price contracts, which are more common with larger or more complex projects, the segment assumes risk related to project estimates versus execution. Revenues under this type of contract can vary, sometimes significantly, from original projects due to additional project complexity; timing uncertainty or extended bidding; extended regulatory or permitting processes; and other factors, which can result in a reduction in profit or losses on a project.

•Subcontractor work and provision of materials. Some work under project contracts is subcontracted out to other companies and margins on subcontractor work is generally lower than work performed by the Company. Increased subcontractor work in a given period may therefore result in lower margins. In addition, inflationary or other pressures may increase the cost of materials under fixed-price contracts and may result in decreased margins on the project. The Company has worked to implement provisions in project contracts to allow for the pass-through of inflationary costs to customers where feasible and will continue to do so to mitigate the impacts.

The segment's management continually monitors its operating margins and has been proactive in addressing the inflationary impacts seen across the United States. The segment is currently experiencing increased fuel and material costs as well as impacts from delays in the national supply chain. The segment is working with suppliers and providers of goods and services in advance of

47

construction to secure pricing and reduce delays for goods and services. The inflationary costs and national supply chain challenges experienced by the segment have increased costs but have not had significant impacts to the procurement of project materials. The Company expects these inflationary pressures and national supply chain challenges to continue throughout the remainder of 2022 and into 2023. Accordingly, operating results in any particular period may not be indicative of the results that can be expected for any other period.

The need to ensure available specialized labor resources for projects also drives strategic relationships with customers and project margins. These trends include an aging workforce and labor availability issues, as well as increasing duration and complexity of customer capital programs. Most of the markets the segment operates in have experienced labor shortages which in some cases have caused increased labor-related costs. The Company continues to monitor the labor markets and expects labor costs to continue to increase based on increases included in collective bargaining agreements and, to a lesser extent, the recent escalated inflationary environment in the United States. Due to these and other factors, the Company believes overall customer and competitor demand for labor resources will continue to increase.

Earnings overview - The following information summarizes the performance of the construction services segment.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	737.0	$	514.8	43	%	$	1,975.1	$	1,558.9	27	%
Cost of sales:
Operation and maintenance	651.8		441.5		48	%	1,708.0		1,310.7		30	%
Depreciation, depletion and amortization	4.3		3.9		10	%	12.6		11.8		7	%
Taxes, other than income	20.2		14.2		42	%	60.5		49.9		21	%
Total cost of sales	676.3		459.6		47	%	1,781.1		1,372.4		30	%
Gross margin	60.7		55.2		10	%	194.0		186.5		4	%
Selling, general and administrative expense:
Operation and maintenance	23.5		23.0		2	%	76.1		71.2		7	%
Depreciation, depletion and amortization	1.2		1.0		20	%	3.3		3.4		(3)	%
Taxes, other than income	1.1		1.1		—	%	4.0		3.7		8	%
Total selling, general and administrative expense	25.8		25.1		3	%	83.4		78.3		7	%
Operating income	34.9		30.1		16	%	110.6		108.2		2	%
Other income	3.5		.9		289	%	4.6		2.6		77	%
Interest expense	1.7		.9		89	%	3.8		2.6		46	%
Income before income taxes	36.7		30.1		22	%	111.4		108.2		3	%
Income tax expense	8.7		7.0		24	%	27.6		26.4		5	%
Net income	$	28.0	$	23.1	21	%	$	83.8	$	81.8	2	%

Operating Statistics	Revenues								Gross Margin
	Three Months Ended				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
	2022		2021		2022		2021		2022		2021		2022		2021
	(In millions)
Electrical & mechanical
Commercial	$	276.6	$	143.2	$	706.6	$	457.0	$	21.8	$	20.8	$	67.2	$	56.7
Industrial	132.3		99.8		339.4		350.2		11.3		7.5		33.4		37.3
Institutional	58.9		36.3		155.0		108.2		1.0		(1.4)		2.3		2.0
Renewables	43.4		2.1		122.8		4.7		(3.9)		.2		.1		.6
Service & other	35.3		38.2		127.0		106.2		3.7		3.8		14.8		13.7
	546.5		319.6		1,450.8		1,026.3		33.9		30.9		117.8		110.3
Transmission & distribution
Utility	179.6		168.6		477.5		465.6		25.8		20.8		72.2		68.5
Transportation	16.1		30.0		59.5		78.2		1.0		3.5		4.0		7.7
	195.7		198.6		537.0		543.8		26.8		24.3		76.2		76.2
Intrasegment eliminations	(5.2)		(3.4)		(12.7)		(11.2)		—		—		—		—
	$	737.0	$	514.8	$	1,975.1	$	1,558.9	$	60.7	$	55.2	$	194.0	$	186.5

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Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021 Construction services earnings increased $4.9 million as a result of:

•Revenues increased $222.2 million.

◦Largely due to higher electrical and mechanical workloads as a result of:

•Higher commercial workloads driven largely by a $97.5 million increase in the hospitality sector, primarily from the progress on large projects; a $30.0 million increase in data center work from the number of and progress on projects started during the quarter; and an increase in the general commercial sector.

•Higher renewable workloads of $41.3 million due to the timing of and progress on commercial renewable projects.

•Higher industrial workloads in the high-tech sector of $22.1 million, the general industrial sector of $14.8 million and the maintenance sector of $14.7 million, all of which benefited from the mix of project work; partially offset by lower refinery workloads.

•Higher institutional workloads, primarily in the healthcare sector of $11.2 million, the education sector of $8.4 million and the government sector, all of which benefited from the mix of project work in the quarter.

◦Also contributing were higher utility workloads as a result of increases in the electrical sector of $14.1 million, the underground sector of $11.9 million, the substation sector of $5.6 million and the distribution sector, all of which benefited from the project timing. These were offset by lower transportation workloads for street lighting also due to project timing.

•Gross margin increased $5.5 million.

◦Largely due to:

•Higher margins on electrical and mechanical work in the industrial, institutional and commercial sectors due to project mix, as well as gains associated with completed commercial jobs.

•Higher utility margins of $7.8 million resulting from the mix of customer projects, partially offset by lower storm margins.

◦Partially offset by:

•Higher overall operating costs related to inflationary pressures, including increased fuel and material costs and higher labor costs from decreased efficiencies on certain projects.

•Lower margins on renewable work, partly due to revisions in estimates on a project due to delays and labor impacts.

•Lower transportation margins, primarily for street lighting and electrical sectors due to customer demand.

•Selling, general and administrative expense increased $700,000.

◦Primarily due to:

•Increased reserve for uncollectible accounts of $600,000.

•Increased office expenses of $400,000

◦Partially offset by decreased payroll-related costs, primarily due to lower incentive accruals.

•Other income increased $2.6 million, primarily related to the Company's joint ventures.

•Interest expense increased $800,000 due to higher working capital needs.

•Income tax expense increased $1.7 million primarily resulting from an increase in income before income taxes.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021 Construction services earnings increased $2.0 million as a result of:

•Revenues increased $416.2 million.

◦Largely due to higher electrical and mechanical workloads as a result of:

•Higher commercial workloads driven largely by a $127.5 million increase in the hospitality sector as a result of progress on large projects; a $58.3 million increase in the data center sector from the number of and progress on projects; and an increase in general commercial workloads as a result of project mix and the progress on contracts.

•Higher renewable workloads due to the timing of and progress on commercial renewable projects.

•Higher institutional workloads, with the education sector contributing an additional $21.0 million, the healthcare sector contributing an additional $18.4 million, and the government sector contributing $4.9 million, all of which were the result of increased activity from project mix and progress on projects.

•Higher service workloads due to the demand for the repair and maintenance of electrical and mechanical systems.

◦Also contributing were higher utility workloads, primarily from an increase in the electrical sector of $32.6 million, the underground sector of $17.3 million, the distribution and substation sectors of $16.1 million and the telecommunications sector of $5.6 million, all of which benefited from increased customer released projects, partially offset by lower transmission and storm work from decreased customer demand.

◦Partially offset by:

•Lower transportation workloads, primarily in the street lighting sector of $25.3 million due to lower demand, partially offset by higher traffic signalization and government workloads.

•Lower industrial workloads, primarily in the high-tech sector of $26.5 million, largely due to the completion of a large high-tech project as well as the timing of other projects, and the maintenance sector of $8.4 million related to the timing of projects. Partially offsetting these decreases was an increase in general industrial sector from project mix and timing.

49

•Gross margin increased $7.5 million.

◦Largely due to:

•Higher commercial and service margins primarily the result of project mix and progression on projects.

•Higher utility margins from the mix of utility projects, offset in part by lower storm margins.

◦Partially offset by:

•Higher overall operating costs related to inflationary pressures, including increased fuel and material costs and higher labor costs from decreased efficiencies on certain projects.

•Lower industrial margins of $3.9 million from the absence of certain higher margin work in 2021, as well as the timing of project completions and project starts.

•Lower transportation margins on street lighting and traffic signalization projects.

•Renewable project margin was negatively impacted from revisions in estimates on a project due to delays and labor impacts.

•Selling, general and administrative expense increased $5.1 million.

◦Primarily due to:

•Increased reserve for uncollectible accounts of $2.6 million.

•Increased office expenses of $1.3 million from an increase in facility costs.

•Increased payroll-related costs of $1.2 million, largely related to higher employee incentive accruals from the higher number of employees.

•Other income increased $2.0 million, primarily related to the Company's joint ventures.

•Interest expense increased $1.2 million due to higher working capital needs.

•Income tax expense increased $1.2 million directly resulting from an increase in income before income taxes.

Outlook The American Rescue Plan provides $1.9 trillion in COVID-19 relief funding for states, schools and local government including broadband infrastructure. States are beginning to move forward with allocating these funds based on federal criteria and state needs, and in some cases, funding of infrastructure projects could positively impact the segment. Additionally, the bipartisan infrastructure proposal, known as the Infrastructure Investment and Jobs Act, was enacted in the fourth quarter of 2021. These include investments for upgrades to electric and grid infrastructure, transportation systems, airports and electric vehicle infrastructure, all industries this segment supports. In addition, the IRA provides $369 billion in new funding for clean energy programs. These programs include new tax incentives for solar, battery storage and hydrogen development along with funding to expand the production of electric vehicles and the build out of infrastructure to support electric vehicles. The Company will continue to monitor the implementation of these legislative items.

The Company continues to have bidding opportunities in the specialty contracting markets in which it operated in during 2022 as evidenced by the segment's backlog. Although bidding remains highly competitive in all areas, the Company expects the segment's relationship with existing customers, skilled workforce, quality of service and effective cost management will continue to provide a benefit in securing and executing profitable projects in the future. The Company has also seen rapidly growing needs for services across the electric vehicle charging, wind generation and energy storage markets that complement existing renewable projects performed by the Company.

The construction services segment's backlog at September 30, was as follows:

	2022		2021
	(In millions)
Electrical & mechanical	$	1,724	$	1,041
Transmission & distribution	278		232
	$	2,002	$	1,273

The 57 percent increase in backlog at September 30, 2022, as compared to backlog at September 30, 2021, was largely attributable to the new project opportunities that the Company continues to be awarded across its diverse operations, particularly within the commercial, institutional, utility and industrial markets. These increases were partially offset by decreases in the transportation market due to the timing of project completions. Period over period increases or decreases in backlog cannot be used as an indicator of future revenues or net income. Of the $2.0 billion of backlog at September 30, 2022, the Company expects to complete an estimated $1.67 billion during the next 12 months. While the Company believes the current backlog of work remains firm, prolonged delays in the receipt of critical supplies and materials could result in customers seeking to delay or terminate existing or pending agreements. As of September 30, 2022, customers have not provided the Company any indications that they no longer wish to proceed with planned projects that have been included in backlog. Additionally, the Company continues to further evaluate potential acquisition opportunities that would be accretive to earnings of the Company and continue to grow the segment's backlog. Factors noted in Part I, Item 1A. Risk Factors in the 2021 Annual Report can cause revenues to be realized in periods and at levels that are different from originally projected.

The labor contract that the construction services segment was negotiating at December 31, 2021, as reported in Items 1 and 2 - Business Properties - General in the 2021 Annual Report, has been ratified.

50

Other

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022		2021		Variance		2022		2021		Variance
	(In millions)
Operating revenues	$	4.4	$	3.4	29	%	$	13.2	$	10.1	31	%
Operating expenses:
Operation and maintenance	4.5		2.3		96	%	11.9		6.9		72	%
Depreciation, depletion and amortization	1.1		1.1		—	%	3.3		3.5		(6)	%
Total operating expenses	5.6		3.4		65	%	15.2		10.4		46	%
Operating loss	(1.2)		—		—	%	(2.0)		(.3)		567	%
Other income	.3		—		—	%	.4		.5		(20)	%
Interest expense	.4		.1		300	%	.8		.2		300	%
Loss before income taxes	(1.3)		(.1)		1200	%	(2.4)		—		—	%
Income tax benefit	(5.1)		(3.9)		31	%	(1.0)		(2.2)		(55)	%
Net income (loss)	$	3.8	$	3.8	—	%	$	(1.4)	$	2.2	(163)	%

Three Months Ended September 30, 2022, Compared to Three Months Ended September 30, 2021

Other was positively impacted by income tax adjustments related to the consolidated company's annualized estimated tax rate. Operating expenses were positively impacted from a reduction in estimated losses recorded at the captive insurer. In addition, higher premiums for the captive insurer were experienced in 2022 compared to 2021, which impacts both operation and maintenance expense and operating revenues. Also included in Other are general and administrative costs and interest expense previously allocated to the exploration and production and refining businesses that do not meet the criteria for income (loss) from discontinued operations, as well as transaction costs associated with the anticipated spinoff of Knife River.

Nine Months Ended September 30, 2022, Compared to Nine Months Ended September 30, 2021

Other was negatively impacted by income tax adjustments related to the consolidated company's annualized estimated tax rate. Operating expenses were positively impacted from a reduction in estimated losses recorded at the captive insurer, partially offset by a loss on the disposal of assets recorded in operation and maintenance expense. In addition, higher premiums for the captive insurer were experienced in 2022 compared to 2021, which impacts both operation and maintenance expense and operating revenues. Also included in Other are general and administrative costs and interest expense previously allocated to the exploration and production and refining businesses that do not meet the criteria for income (loss) from discontinued operations, as well as transaction costs associated with the anticipated spinoff of Knife River.

Intersegment Transactions

Amounts presented in the preceding tables will not agree with the Consolidated Statements of Income due to the Company's elimination of intersegment transactions. The amounts related to these items were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In millions)
Intersegment transactions:
Operating revenues	$	10.8	$	8.0	$	57.0	$	51.4
Operation and maintenance	7.3		4.2		20.2		14.0
Purchased natural gas sold	3.5		3.8		36.8		37.4

For more information on intersegment eliminations, see Note 17.

Liquidity and Capital Commitments

At September 30, 2022, the Company had cash and cash equivalents of $74.6 million and available borrowing capacity of $371.6 million under the outstanding credit facilities of the Company's subsidiaries. The Company expects to meet its obligations for debt maturing within one year and its other operating and capital requirements from various sources, including internally generated funds; credit facilities and commercial paper of the Company's subsidiaries, as described in Capital resources; and issuance of debt and equity securities if necessary.

51

Cash flows

	Nine Months Ended
	September 30,
	2022		2021
	(In millions)
Net cash provided by (used in):
Operating activities	$	284.9	$	365.8
Investing activities	(465.4)		(432.6)
Financing activities	200.9		64.5
Increase (decrease) in cash and cash equivalents	20.4		(2.3)
Cash and cash equivalents -- beginning of year	54.2		59.6
Cash and cash equivalents -- end of period	$	74.6	$	57.3

Operating activities 

	Nine Months Ended
	September 30,
	2022		2021		Variance
	(In millions)
Components of net cash provided by operating activities:
Income from continuing operations	$	250.3	$	291.3	$	(41.0)
Adjustments to reconcile net income to net cash provided by operating activities	279.3		246.1		33.2
Changes in current assets and liabilities, net of acquisitions:
Receivables	(346.9)		(103.6)		(243.3)
Inventories	(60.7)		(21.4)		(39.3)
Other current assets	(31.4)		(74.4)		43.0
Accounts payable	148.4		33.1		115.3
Other current liabilities	62.1		14.2		47.9
Pension and postretirement benefit plan contributions	(.4)		(.3)		(.1)
Other noncurrent changes	(15.8)		(19.1)		3.3
Net cash used in discontinued operations	—		(.1)		.1
Net cash provided by operating activities	$	284.9	$	365.8	$	(80.9)

The changes in cash flows from operating activities generally follow the results of operations, as discussed in Business Segment Financial and Operating Data, and are affected by changes in working capital. The decrease in cash flows provided by operating activities in the previous table was largely driven by higher working capital needs at the construction services and construction materials and contracting businesses due to fluctuations in job activity resulting in higher receivables in the period, as well as lower collections of accounts receivable compared to first nine months of 2021 offset in part by increased accounts payable. Also contributing to the decrease were increased inventories related to higher gas costs at the natural gas distribution business and lower earnings across most of the Company's businesses. Partially offsetting the net decrease in cash flows provided by operating activities was the recovery of purchased gas adjustment balances and the absence of higher natural gas purchases in February 2021, as discussed in Note 13. Other current assets and liabilities were also impacted by the Company's net tax position.

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Investing activities

	Nine Months Ended
	September 30,
	2022		2021		Variance
	(In millions)
Components of net cash used in investing activities:
Capital expenditures	$	(463.0)	$	(428.1)	$	(34.9)
Acquisitions, net of cash acquired	.4		(13.7)		14.1
Net proceeds from sale or disposition of property and other	1.6		13.0		(11.4)
Investments	(4.4)		(3.8)		(.6)
Net cash used in investing activities	$	(465.4)	$	(432.6)	$	(32.8)

The increase in cash used in investing activities in the previous table was primarily due to increased capital expenditures in 2022 related to increased electric production projects, including the construction of Heskett Unit 4 and the repower of Diamond Willow at the electric business; higher natural gas distribution projects, including natural gas mains and meters at the natural gas distribution business; and the construction of a new building at the construction services business. The construction services and electric businesses also experienced lower proceeds from asset sales in 2022 related to the sale of a building and decommissioning activities related to plant closures, respectively. Offsetting the increased cash used in investing activities was decreased capital expenditures at the pipeline business as a result of the North Bakken Expansion project being placed in service in February 2022 and lower cash used for acquisition activity at the construction materials and contracting business.

Financing activities

	Nine Months Ended
	September 30,
	2022		2021		Variance
	(In millions)
Components of net cash provided by financing activities:
Issuance of short-term borrowings	$	100.0	$	50.0	$	50.0
Repayment of short-term borrowings	—		(50.0)		50.0
Issuance of long-term debt	270.3		178.9		91.4
Repayment of long-term debt	(23.1)		(63.8)		40.7
Debt issuance costs	(1.1)		(.4)		(.7)
Net proceeds from issuance of common stock	(.1)		88.8		(88.9)
Dividends paid	(132.7)		(128.1)		(4.6)
Repurchase of common stock	(7.4)		(6.7)		(.7)
Tax withholding on stock-based compensation	(5.0)		(4.2)		(.8)
Net cash provided by financing activities	$	200.9	$	64.5	$	136.4

The increase in cash provided by financing activities in the previous table was largely the result of increased issuance of short-term and long-term debt at the construction services and construction materials and contracting businesses to fund higher working capital needs and at the electric and natural gas distribution business to fund capital expenditures and higher natural gas costs. The issuances were partially offset by the repayment of commercial paper borrowings that were replaced by short-term debt and private placement borrowings. Also partially offsetting the increase in cash provided by financing activities was the absence of the issuance of common stock under the Company's "at-the-market" offering during 2022, as discussed in Note 7.

Defined benefit pension plans

The Company has noncontributory qualified defined benefit pension plans. Various assumptions are used in calculating the benefit expense (income) and liability (asset) related to these plans, as such costs of providing these benefits bear the risk of changes as they are dependent upon assumptions of future conditions.

For 2022, the Company assumed a long-term rate of return on its qualified defined pension plan assets of 6 percent. Through September 30, 2022, due to the decline in the equity and fixed-income markets, the Company experienced a 25 percent loss on its qualified defined pension plan assets. Differences between actuarial assumptions and actual plan results are deferred and amortized into expense when the accumulated differences exceed 10 percent of the greater of the projected benefit obligation or the market-related value of plan assets. Therefore, this change in asset values will be reflected in future expenses of the plans, beginning in 2023.

There were no other material changes to the Company's qualified noncontributory defined benefit pension plans from those reported in the 2021 Annual Report. For more information, see Note 18 and Part II, Item 7 in the 2021 Annual Report.

53

Capital expenditures

Capital expenditures for the first nine months of 2022 and 2021 were $451.1 million and $507.9 million, respectively. Capital expenditures allocated to the Company's business segments are estimated to be approximately $702 million for 2022. Capital expenditures have been updated from what was previously reported in the 2021 Annual Report to accommodate project timeline and scope changes made throughout the first three quarters of 2022.

The Company has included in the estimated capital expenditures for 2022 multiple organic growth projects at the pipeline business and construction of Heskett Unit 4 at the electric business, as previously discussed in Business Segment Financial and Operating Data, as well as system upgrades; routine replacements; service extensions; routine equipment maintenance and replacements; buildings, land and building improvements; pipeline and natural gas storage projects; power generation and transmission opportunities, environmental upgrades; and other growth opportunities.

The Company continues to evaluate potential future acquisitions and other growth opportunities that would be incremental to the outlined capital program; however, they are dependent upon the availability of economic opportunities and, as a result, capital expenditures may vary significantly from the estimate previously discussed. The Company continuously monitors its capital expenditures for project delays and changes in economic viability and adjusts as necessary. It is anticipated that all of the funds required for capital expenditures for 2022 will be funded by various sources, including internally generated funds; credit facilities and commercial paper of the Company's subsidiaries, as described later; and issuance of debt and equity securities if necessary.

Capital resources

The Company requires significant cash to support and grow its businesses. The primary sources of cash other than cash generated from operating activities are cash from revolving credit facilities, cash from the issuance of long-term debt and cash from the sale of equity securities.

Debt resources

Certain debt instruments of the Company's subsidiaries contain restrictive and financial covenants and cross-default provisions. In order to borrow under the respective debt instruments, the subsidiary companies must be in compliance with the applicable covenants and certain other conditions, all of which the subsidiaries, as applicable, were in compliance with at September 30, 2022. In the event the subsidiaries do not comply with the applicable covenants and other conditions, alternative sources of funding may need to be pursued. For more information on the covenants, certain other conditions and cross-default provisions, see Part II, Item 8 in the 2021 Annual Report.

The following table summarizes the outstanding revolving credit facilities of the Company's subsidiaries at September 30, 2022:

Company	Facility		Facility Limit			Amount Outstanding		Letters of Credit			Expiration Date
			(In millions)
Montana-Dakota Utilities Co.	Commercial paper/Revolving credit agreement	(a)	$	175.0		$	86.7	$	—		12/19/24
Cascade Natural Gas Corporation	Revolving credit agreement		$	100.0	(b)	$	60.6	$	2.2	(c)	6/7/24
Intermountain Gas Company	Revolving credit agreement		$	85.0	(d)	$	65.0	$	—		6/7/24
Centennial Energy Holdings, Inc.	Commercial paper/Revolving credit agreement	(e)	$	600.0		$	373.9	$	—		12/19/24

(a)The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Montana-Dakota on stated conditions, up to a maximum of $225.0 million). At September 30, 2022, there were no amounts outstanding under the revolving credit agreement.

(b)Certain provisions allow for increased borrowings, up to a maximum of $125.0 million.

(c)Outstanding letter(s) of credit reduce the amount available under the credit agreement.

(d)Certain provisions allow for increased borrowings, up to a maximum of $110.0 million.

(e)The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Centennial on stated conditions, up to a maximum of $700.0 million). At September 30, 2022, there were no amounts outstanding under the revolving credit agreement.

The respective commercial paper programs are supported by revolving credit agreements. While the amount of commercial paper outstanding does not reduce available capacity under the respective revolving credit agreements, Montana-Dakota and Centennial do not issue commercial paper in an aggregate amount exceeding the available capacity under the credit agreements. The commercial paper borrowings may vary during the period, largely the result of fluctuations in working capital requirements due to the seasonality of certain operations of the Company's subsidiaries.

Total equity as a percent of total capitalization was 53 percent, 58 percent and 55 percent at September 30, 2022 and 2021, and December 31, 2021, respectively. This ratio is calculated as the Company's total equity, divided by the Company's total capital.

54

Total capital is the Company's total debt, including short-term borrowings and long-term debt due within one year, plus total equity. This ratio is an indicator of how a company is financing its operations, as well as its financial strength.

Cascade On June 15, 2022, Cascade issued $50.0 million of senior notes under a note purchase agreement with maturity dates ranging from June 15, 2032 to June 15, 2052, at a weighted average interest rate of 4.50 percent. The agreement contains customary covenants and provisions, including a covenant of Cascade not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent.

Intermountain On June 15, 2022, Intermountain issued $40.0 million of senior notes under a note purchase agreement with maturity dates ranging from June 15, 2052 to June 15, 2062, at a weighted average interest rate of 4.68 percent. The agreement contains customary covenants and provisions, including a covenant of Intermountain not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent.

On October 13, 2022, Intermountain amended and restated its revolving credit agreement to increase the borrowing capacity to $100.0 million and extend the maturity date to October 13, 2027. Any borrowings under the revolving credit agreement are classified as long-term debt as they are intended to be refinanced on a long-term basis through continued borrowings.

Centennial On March 18, 2022, Centennial entered into a $100.0 million term loan agreement with a SOFR-based variable interest rate and a maturity date of March 17, 2023. The agreement contains customary covenants and provisions, including a covenant of Centennial not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent. The covenants also include certain restrictions on the sale of certain assets, loans and investments.

On March 23, 2022, Centennial issued $150.0 million of senior notes under a note purchase agreement with maturity dates ranging from March 23, 2032 to March 23, 2034, at a weighted average interest rate of 3.71 percent. The agreement contains customary covenants and provisions, including a covenant of Centennial not to permit, at any time, the ratio of total debt to total capitalization to be greater than 60 percent.

Equity Resources

The Company currently has a shelf registration statement on file with the SEC, under which the Company may issue and sell any combination of common stock and debt securities. The Company may sell such securities if warranted by market conditions and the Company's capital requirements.

In August 2020, the Company amended the Distribution Agreement dated February 22, 2019, with J.P. Morgan Securities LLC and MUFG Securities Americas Inc., as sales agents. This agreement, as amended, allows the offering, issuance and sale of up to 6.4 million shares of the Company's common stock in connection with an "at-the-market" offering. The common stock may be offered for sale, from time to time, in accordance with the terms and conditions of this agreement. As of September 30, 2022, the Company had capacity to issue up to 3.6 million additional shares of common stock under the "at-the-market" offering program. Proceeds from the sale of shares of common stock under this agreement have been and are expected to be used for general corporate purposes, which may include, among other things, working capital, capital expenditures, debt repayment and the financing of acquisitions.

Details of the Company's "at-the-market" offering activity was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2022		2021			2022		2021
	(In millions)
Shares issued	—		1.0			—		2.8
Net proceeds *	$	—	$	34.2	**	$	(.1)	$	88.8	**

*    Net proceeds include issuance costs of $— and $149,000 for the three and nine months ended September 30, 2022, respectively, and $425,000 and $1.2 million for the three and nine months ended September 30, 2021, respectively.

**    Net proceeds were used for capital expenditures.

Material cash requirements

For more information on the Company's contractual obligations on long-term debt, operating leases and purchase commitments, see Part II, Item 7 in the 2021 Annual Report. There were no material changes in the Company's contractual obligations related to asset retirement obligations, uncertain tax positions and minimum funding requirements for its defined benefit plans for 2022 from those reported in the 2021 Annual Report.

55

At September 30, 2022, the Company's future estimated interest payments increased 12 percent since December 31, 2021, due to higher debt balances and rising interest rates. The Company expects interest rates will continue to increase the remainder of 2022 as indicated by the Federal Reserve. At September 30, 2022, the Company's future purchase commitments increased 7 percent since December 31, 2021, down from an increase of 14 percent at June 30, 2022. The increase in purchase commitments is largely due to increases to the cost of asphalt oil at the construction materials and contracting business and higher natural gas costs and contract extensions associated with natural gas supply at the natural gas distribution business. The Company anticipates that these items will be funded by various sources, including internally generated funds, as well as credit facilities and commercial paper of the Company's subsidiaries.

Material short-term cash requirements of the Company include repayment of outstanding borrowings and interest payments on those agreements, payments on operating lease agreements, payment of obligations on purchase commitments and asset retirement obligations.

Material long-term cash requirements of the Company include repayment of outstanding borrowings and interest payments on those agreements, payments on operating lease agreements, payment of obligations on purchase commitments and asset retirement obligations.

New Accounting Standards

For information regarding new accounting standards, see Note 2, which is incorporated by reference.

Critical Accounting Estimates

The Company's critical accounting estimates include impairment testing of goodwill; fair values of acquired assets and liabilities under the acquisition method of accounting; regulatory assets expected to be recovered in rates charged to customers; revenue recognized using the cost-to-cost measure of progress for contracts; actuarially determined benefit costs; and tax provisions. There were no material changes in the Company's critical accounting estimates from those reported in the 2021 Annual Report. For more information on critical accounting estimates, see Part II, Item 7 in the 2021 Annual Report.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The Company is exposed to the impact of market fluctuations associated with interest rates and commodity prices. The Company has policies and procedures to assist in controlling these market risks and from time to time has utilized derivatives to manage a portion of its risk.

Interest rate risk

There were no material changes to interest rate risk faced by the Company from those reported in the 2021 Annual Report.

At September 30, 2022, the Company had no outstanding interest rate hedges.

Commodity price risk

There were no material changes to commodity price risk faced by the Company from those reported in the 2021 Annual Report.

Item 4. Controls and Procedures

Evaluation of disclosure controls and procedures

The term "disclosure controls and procedures" is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act. The Company's disclosure controls and other procedures are designed to provide reasonable assurance that information required to be disclosed in the reports that the Company files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms. The Company's disclosure controls and other procedures are designed to provide reasonable assurance that information required to be disclosed is accumulated and communicated to management, including the Company's chief executive officer and chief financial officer, to allow timely decisions regarding required disclosure. The Company's management, with the participation of the Company's chief executive officer and chief financial officer, has evaluated the effectiveness of the Company's disclosure controls and other procedures as of the end of the period covered by this report. Based upon that evaluation, the chief executive officer and the chief financial officer have concluded that, as of the end of the period covered by this report, such controls and procedures were effective at a reasonable assurance level.

Changes in internal controls

No change in the Company's internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the three months ended September 30, 2022, that has materially affected, or is reasonably likely to materially affect, the Company's internal control over financial reporting.

56

Part II -- Other Information

Item 1. Legal Proceedings

There were no material changes to the Company's legal proceedings in Part 1, Item 3 - Legal Proceedings in the 2021 Annual Report.

Item 1A. Risk Factors

Please refer to the Company's risk factors that are disclosed in Part I, Item 1A. Risk Factors in the 2021 Annual Report that could be materially harmful to the Company's business, prospects, financial condition or financial results if they occur. At September 30, 2022, there were no material changes to the Company's risk factors provided in Part I, Item 1A. Risk Factors in the 2021 Annual Report other than as set forth below.

The proposed separation of Knife River into an independent, publicly traded company is subject to various risks and uncertainties, and may not be completed on the terms or timeline currently contemplated, if at all. In addition, the Company's review of options to optimize the value of its construction services business is subject to various risks and uncertainties and may not achieve its intended goals.

On August 4, 2022, the Company announced its plan to separate Knife River, the construction materials and contracting business, from the Company, resulting in two independent, publicly traded companies. The proposed separation is expected to be effected as a tax-free spinoff to the Company’s stockholders for U.S. federal income tax purposes and is expected to be completed in 2023, subject to the satisfaction of customary conditions, including final approval by the Company’s Board of Directors, receipt of a tax opinion and a private letter ruling from the IRS, and the effectiveness of a registration statement on Form 10 to be filed with the SEC.

The execution of the proposed separation will require significant time and attention from the Company’s senior management and employees, which could disrupt the Company’s ongoing business and adversely affect financial results and results of operations. The proposed separation is also complex, and completion of the proposed separation and the timing of its completion will be subject to a number of factors and conditions, including the readiness of the new company to operate as an independent public company and finalization of the capital structure of the new company. Unanticipated developments could delay, prevent or otherwise adversely affect the proposed separation, including, but not limited to, changes in general economic and financial market conditions, material adverse changes in business or industry conditions, unanticipated costs and potential problems or delays in obtaining various regulatory and tax approvals or clearances. In particular, changes in interest or exchange rates and the effects of inflation could delay or adversely affect the proposed separation, including in connection with any debt financing transactions undertaken in connection with the separation or the terms of any indebtedness incurred in connection therewith. There can be no assurances that the Company will be able to complete the proposed separation on the terms or on the timeline that was announced, if at all. In addition, if the separation is completed, the Company may not be able to achieve the full strategic and financial benefits that are expected to result from the separation. There can be no assurance that the combined value of the common stock of the two companies will be equal to or greater than what the value of the Company’s common stock would have been had the proposed separation not occurred, or that the separation will not adversely impact the ability of the Company to maintain its historical practices with respect to dividends.

In addition, on November 3, 2022, the Company announced its intention to create two pure-play publicly traded companies, one focused on regulated energy delivery and the other on construction materials, and that, to achieve this future structure, the board has authorized management to commence a strategic review process of MDU Construction Services. The Company's intent to create two pure-play publicly traded companies is subject to changing market conditions and may not receive the level of market support that the Company expects, and may not be completed timely or at all.

57

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table includes information with respect to the Company's purchase of equity securities:

ISSUER PURCHASES OF EQUITY SECURITIES
Period	(a) Total Number of Shares (or Units) Purchased (1)	(b) Average Price Paid per Share (or Unit)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs (2)	(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs (2)
July 1 through July 31, 2022	—	$	—	—	—
August 1 through August 31, 2022	—	$	—	—	—
September 1 through September 30, 2022	—	$	—	—	—
Total	—	$	—	—	—

(1)    Represents shares of common stock purchased on the open market in connection with the vesting of shares granted pursuant to the Long-Term Performance-Based Incentive Plan.

(2)    Not applicable. The Company does not currently have in place any publicly announced plans or programs to purchase equity securities.

Item 4. Mine Safety Disclosures

For information regarding mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Act and Item 104 of Regulation S-K, see Exhibit 95 to this Form 10-Q, which is incorporated herein by reference.

Item 5. Other Information

None.

Item 6. Exhibits

See the index to exhibits immediately preceding the signature page to this report.

58

Exhibits Index
			Incorporated by Reference
Exhibit Number	Exhibit Description	Filed Herewith	Form	Period Ended	Exhibit	Filing Date	File Number
3(a)	Amended and Restated Certificate of Incorporation of MDU Resources Group, Inc.		8-K		3.2	5/8/19	1-03480
3(b)	Amended and Restated Bylaws of MDU Resources Group, Inc.		8-K		3.1	2/15/19	1-03480
+10(a)	MDU Resources Group, Inc. 401(k) Retirement Plan, as amended August 17, 2022	X
31(a)	Certification of Chief Executive Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	X
31(b)	Certification of Chief Financial Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	X
32	Certification of Chief Executive Officer and Chief Financial Officer furnished pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	X
95	Mine Safety Disclosures	X
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

+    Management contract, compensatory plan or arrangement.

59

Signatures

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

		MDU RESOURCES GROUP, INC.
DATE:	November 3, 2022	BY:	/s/ Jason L. Vollmer
			Jason L. Vollmer
			Vice President and Chief Financial Officer
		BY:	/s/ Stephanie A. Barth
			Stephanie A. Barth
			Vice President, Chief Accounting Officer and Controller

60

EX-31.A

CERTIFICATION

I, David L. Goodin, certify that:

1.I have reviewed this quarterly report on Form 10-Q of MDU Resources Group, Inc.;

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: November 3, 2022 

/s/ David L. Goodin

David L. Goodin

President and Chief Executive Officer

EX-31.B

CERTIFICATION

I, Jason L. Vollmer, certify that:

1.I have reviewed this quarterly report on Form 10-Q of MDU Resources Group, Inc.;

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:  November 3, 2022

/s/ Jason L. Vollmer

Jason L. Vollmer

Vice President and Chief Financial Officer

EX-32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

    Each of the undersigned, David L. Goodin, the President and Chief Executive Officer, and Jason L. Vollmer, the Vice President and Chief Financial Officer of MDU Resources Group, Inc. (the "Company"), DOES HEREBY CERTIFY that:

    1.  The Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2022 (the "Report"), fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

    2.  Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

    IN WITNESS WHERE OF, each of the undersigned has executed this statement this 3rd day of November, 2022.

/s/ David L. Goodin

David L. Goodin

President and Chief Executive Officer

/s/ Jason L. Vollmer

Jason L. Vollmer

Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to MDU Resources Group, Inc. and will be retained by MDU Resources Group, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-95

MDU RESOURCES GROUP, INC.

MINE SAFETY INFORMATION

The Dodd-Frank Wall Street Reform and Consumer Protection Act (Dodd-Frank Act) requires issuers to include in periodic reports filed with the SEC certain information relating to citations or orders for violations of standards under the Federal Mine Safety and Health Act of 1977 (Mine Act), as amended by the Mine Improvement and New Emergency Response Act of 2006 (Mine Safety Act). The Dodd-Frank Act requires reporting of the following types of citations or orders:

1.    Citations issued under Section 104 of the Mine Safety Act for violations that could significantly and substantially contribute to the cause and effect of a coal or other mine safety or health hazard.

2.    Orders issued under Section 104(b) of the Mine Safety Act. Orders are issued under this section when citations issued under Section 104 have not been totally abated within the time period allowed by the citation or subsequent extensions.

3.    Citations or orders issued under Section 104(d) of the Mine Safety Act. Citations or orders are issued under this section when it has been determined that the violation is caused by an unwarrantable failure of the mine operator to comply with the standards. An unwarrantable failure occurs when the mine operator is deemed to have engaged in aggravated conduct constituting more than ordinary negligence.

4.    Citations issued under Section 110(b)(2) of the Mine Safety Act for flagrant violations. Violations are considered flagrant for repeat or reckless failures to make reasonable efforts to eliminate a known violation of a mandatory health and safety standard that substantially and proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

5.    Imminent danger orders issued under Section 107(a) of the Mine Safety Act. An imminent danger is defined as the existence of any condition or practice in a coal or other mine which could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated.

6.    Notice received under Section 104(e) of the Mine Safety Act of a pattern of violations or the potential to have such a pattern of violations that could significantly and substantially contribute to the cause and effect of mine health and safety standards.

During the three months ended September 30, 2022, none of the Company's operating subsidiaries received citations or orders under the following sections of the Mine Safety Act: 104(b), 104(d), 110(b)(2), 107(a) or 104(e). The Company did not have any mining-related fatalities during this period.

1

MSHA Identification Number/Contractor ID	Section 104 S&S Citations (#)	Total Dollar Value of MSHA Assessments Proposed ($)		Legal Actions Pending as of Last Day of Period (#)	Legal Actions Initiated During Period (#)	Legal Actions Resolved During Period (#)
04-00081	1	$	321	—	—	—
21-02614	—	133		—	—	—
21-03872	—	133		—	—	—
24-02095	—	133		—	—	—
32-00774	4	2,518		—	—	—
32-00950	—	133		—	—	—
35-02382	1	273		—	—	—
35-02968	—	—		1	—	—
35-03022	—	—		1	1	1
35-03321	—	266		—	—	—
35-03527	1	597		—	—	—
35-03558	1	133		—	—	—
35-03581	—	133		—	—	1
35-03590	—	133		—	—	—
35-03642	—	133		—	—	—
39-00008	—	708		—	—	—
41-02639	—	266		—	—	—
41-03931	—	133		—	—	—
41-05498	—	133		—	—	—
48-00715	—	133		—	—	—
48-01598	3	—		—	—	—
50-00883	—	266		—	—	—
50-01196	2	—		—	—	—
	13	$	6,678	2	1	2

Legal actions pending before the Federal Mine Safety and Health Review Commission (the Commission) may involve, among other questions, challenges by operators to citations, orders and penalties they have received from the Federal Mine Safety and Health Administration (MSHA) or complaints of discrimination by miners under section 105 of the Mine Act. The following is a brief description of the types of legal actions that may be brought before the Commission.

•Contests of Citations and Orders - A contest proceeding may be filed with the Commission by operators, miners or miners' representatives to challenge the issuance of a citation or order issued by MSHA.

•Contests of Proposed Penalties (Petitions for Assessment of Penalties) - A contest of a proposed penalty is an administrative proceeding before the Commission challenging a civil penalty that MSHA has proposed for the alleged violation contained in a citation or order.

•Complaints for Compensation - A complaint for compensation may be filed with the Commission by miners entitled to compensation when a mine is closed by certain withdrawal orders issued by MSHA. The purpose of the proceeding is to determine the amount of compensation, if any, due miners idled by the orders.

•Complaints of Discharge, Discrimination or Interference - A discrimination proceeding is a case that involves a miner's allegation that he or she has suffered a wrong by the operator because he or she engaged in some type of activity protected under the Mine Act, such as making a safety complaint.

•Applications for Temporary Relief - Applications for temporary relief from any modification or termination of any order or from any order issued under section 104 of the Mine Act.

•Appeals of Judges' Decisions or Orders to the Commission - A filing with the Commission for discretionary review of a judge's decision or order by a person who has been adversely affected or aggrieved by such decision or order.

2

The following table reflects the types of legal actions pending before the Commission as of September 30, 2022:

MSHA Identification Number	Contests of Citations and Orders	Contests of Proposed Penalties	Complaints for Compensation	Complaints of Discharge, Discrimination or Interference	Applications for Temporary Relief	Appeals of Judges' Decisions or Orders to the Commission
35-02968	1	—	—	—	—	—
35-03022	1	—	—	—	—	—
	2	—	—	—	—	—

3

EX-10.A

FOURTH AMENDMENT

TO THE

MDU RESOURCES GROUP, INC.

401(k) RETIREMENT PLAN

The MDU Resources Group, Inc. 401(k) Retirement Plan (the “Plan”), as most recently amended and restated effective April 1, 2020 is hereby further amended by this Fourth Amendment effective as of January 1, 2022, as follows:

By adding the following paragraphs in Section C.1-2 Eligibility of Schedule C.1 Retirement Contributions – Certain Participating Affiliates and Section C.2-2 Eligibility of Schedule C.2 Retirement Contributions – MDU Resources Group, Inc. and Certain Participating Affiliates:

Notwithstanding the foregoing, eligible employees of Cascade Natural Gas Corporation, Great Plains Natural Gas Co., Intermountain Gas Company, Knife River Corporation, MDU Construction Services Group, Inc., MDU Resources Group, Inc., Montana-Dakota Utilities Co., WBI Energy, Inc., WBI Energy Midstream, LLC, and WBI Energy Transmission, Inc. who are compensated for 960 hours or more through June 30, 2022 will receive a pro-rata allocation mid-year based on compensation paid through June 30, 2022.

IN WITNESS WHEREOF, MDU Resources Group, Inc., as Sponsoring Employer of the Plan, has caused this amendment to be duly executed by a member of the MDU Resources Group, Inc. Employee Benefits Committee on this day 17th of August, 2022.

MDU RESOURCES GROUP, INC.

EMPLOYEE BENEFITS COMMITTEE

By: /s/ Jason L. Vollmer           

Jason L. Vollmer, Chairman

XML

Cover page - shares	9 Months Ended
	Sep. 30, 2022	Oct. 27, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	1-03480
Entity Registrant Name	MDU RESOURCES GROUP INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-1133956
Entity Address, Address Line One	1200 West Century Avenue
Entity Address, Address Line Two	P.O. Box 5650
Entity Address, City or Town	Bismarck
Entity Address, State or Province	ND
Entity Address, Postal Zip Code	58506-5650
City Area Code	701
Local Phone Number	530-1000
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	MDU
Security Exchange Name	NYSE
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 common stock, shares outstanding		203,350,740
Entity Central Index Key	0000067716
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false

XML

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating revenues:
Operating revenues:	$ 1,977,206	$ 1,586,013	$ 5,114,686	$ 4,237,608
Operating expenses:
Operation and maintenance:	1,546,852	1,212,898	3,771,550	3,102,353
Purchased natural gas sold	61,863	41,135	444,527	280,584
Depreciation, depletion and amortization	82,293	75,229	247,173	222,613
Taxes, other than income	56,267	48,096	185,303	163,819
Electric fuel and purchased power	20,080	19,486	68,370	56,216
Total operating expenses	1,767,355	1,396,844	4,716,923	3,825,585
Operating income	209,851	189,169	397,763	412,023
Other income (expense)	4,769	5,930	(1,877)	18,310
Interest expense	31,369	23,389	84,741	70,224
Income before income taxes	183,251	171,710	311,145	360,109
Income taxes	35,318	32,748	60,847	68,860
Income from continuing operations	147,933	138,962	250,298	291,249
Discontinued operations, net of tax	38	314	103	348
Net income	$ 147,971	$ 139,276	$ 250,401	$ 291,597
Earnings per share - basic:
Income from continuing operations	$ 0.73	$ 0.68	$ 1.23	$ 1.44
Discontinued operations, net of tax	0	0	0	0
Earnings per share - basic	0.73	0.68	1.23	1.44
Earnings per share - diluted:
Income from continuing operations	0.73	0.68	1.23	1.44
Discontinued operations, net of tax	0	0	0	0
Earnings per share - diluted	$ 0.73	$ 0.68	$ 1.23	$ 1.44
Weighted average common shares outstanding - basic	203,351	202,863	203,351	201,647
Weighted average common shares outstanding - diluted	203,644	203,190	203,407	201,955
Regulated operation
Operating revenues:
Operating revenues:	$ 263,614	$ 237,065	$ 1,140,528	$ 940,017
Operating expenses:
Operation and maintenance:	89,502	90,058	281,430	273,796
Income from continuing operations	12,917	15,399	72,761	89,207
Nonregulated operation
Operating revenues:
Operating revenues:	1,713,592	1,348,948	3,974,158	3,297,591
Operating expenses:
Operation and maintenance:	1,457,350	1,122,840	3,490,120	2,828,557
Income from continuing operations	$ 135,016	$ 123,563	$ 177,537	$ 202,042

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 147,971	$ 139,276	$ 250,401	$ 291,597
Other comprehensive income (loss):
Reclassification adjustment for loss on derivative instruments included in net income, tax	37	36	109	109
Reclassification adjustment for loss on derivative instruments included in net income, net of tax	111	111	334	334
Postretirement liability adjustment:
Amortization of postretirement liability losses included in net periodic benefit credit, tax	148	151	460	462
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax	461	466	1,367	1,389
Reclassification of postretirement liability adjustment from regulatory asset, tax	0	0	(1,086)	0
Reclassification of postretirement liability adjustment from regulatory asset, net of tax	0	0	(3,265)	0
Postretirement liability adjustment	461	466	(1,898)	1,389
Net unrealized loss on available-for-sale investments:
Net unrealized loss on available-for-sale investments arising during the period, tax	(88)	(15)	(207)	(40)
Net unrealized loss on available-for-sale investments arising during the period, net of tax	(329)	(54)	(777)	(150)
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	12	6	27	21
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax	42	20	99	80
Net unrealized loss on available-for-sale investments	(287)	(34)	(678)	(70)
Other comprehensive income (loss)	285	543	(2,242)	1,653
Comprehensive income attributable to common stockholders	$ 148,256	$ 139,819	$ 248,159	$ 293,250

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 74,620	$ 54,161	$ 57,241
Receivables, net	1,298,019	946,741	979,862
Inventories	398,642	335,609	312,285
Current regulatory assets	148,160	118,691	133,135
Prepayments and other current assets	104,850	95,741	83,364
Total current assets	2,024,291	1,550,943	1,565,887
Noncurrent assets:
Property, plant and equipment	9,257,067	8,972,849	8,634,737
Less accumulated depreciation, depletion and amortization	3,263,217	3,216,461	3,175,756
Net property, plant and equipment	5,993,850	5,756,388	5,458,981
Goodwill	763,262	765,386	717,646
Other intangible assets, net	18,745	22,578	22,241
Regulatory assets	344,442	357,851	379,245
Investments	157,860	175,476	171,859
Operating lease right-of-use assets	119,586	124,138	109,439
Other	185,094	157,675	143,565
Total noncurrent assets	7,582,839	7,359,492	7,002,976
Total assets	9,607,130	8,910,435	8,568,863
Current liabilities:
Short-term borrowings	100,000	0	50,000
Long-term debt due within one year	214,453	148,053	1,548
Accounts payable	630,699	478,933	525,704
Taxes payable	93,565	80,372	87,455
Dividends payable	44,229	44,229	43,212
Accrued compensation	99,824	81,904	105,867
Operating lease liabilities due within one year	34,569	35,368	30,502
Regulatory liabilities due within one year	18,599	16,303	16,491
Other accrued liabilities	232,364	207,078	212,140
Total current liabilities	1,468,302	1,092,240	1,072,919
Noncurrent liabilities:
Long-term debt	2,773,999	2,593,847	2,326,718
Deferred income taxes	617,996	591,962	557,582
Asset retirement obligations	472,931	458,061	455,522
Regulatory liabilities	433,212	428,790	426,141
Operating lease liabilities	85,884	89,253	79,397
Other	262,948	273,408	318,306
Total noncurrent liabilities	4,646,970	4,435,321	4,163,666
Commitments and contingencies
Stockholders' equity:
Common stock	203,889	203,889	203,889
Other paid-in capital	1,455,241	1,461,205	1,458,208
Retained earnings	1,879,600	1,762,410	1,720,232
Accumulated other comprehensive loss	(43,246)	(41,004)	(46,425)
Treasury stock at cost - 538,921 shares	(3,626)	(3,626)	(3,626)
Total stockholders' equity	3,491,858	3,382,874	3,332,278
Total liabilities and stockholders' equity	$ 9,607,130	$ 8,910,435	$ 8,568,863
Common Stock, Shares Authorized	500,000,000	500,000,000	500,000,000
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00	$ 1.00
Common Stock, Shares, Issued	203,889,661	203,889,661	203,889,661
Treasury Stock, Common, Shares	538,921	538,921	538,921

XML

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common stock	Other paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock
Common stock balance (in shares) at Dec. 31, 2020		201,061,198
Treasury stock (in shares) at Dec. 31, 2020						(538,921)
Balance at Dec. 31, 2020	$ 3,079,105	$ 201,061	$ 1,371,385	$ 1,558,363	$ (48,078)	$ (3,626)
Net income	52,131			52,131
Other comprehensive income	568				568
Dividends declared on common stock	(42,943)			(42,943)
Stock-based compensation	2,574		2,574
Repurchase of common stock						(392,294)
Repurchase of common stock	(6,701)					$ (6,701)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			(10,828)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						392,294
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						$ 6,701
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	(4,127)
Issuance of common stock (shares)		672,260
Issuance of common stock	19,699	$ 672	19,027
Common stock balance (in shares) at Mar. 31, 2021		201,733,458
Treasury stock (in shares) at Mar. 31, 2021						(538,921)
Balance at Mar. 31, 2021	3,100,306	$ 201,733	1,382,158	1,567,551	(47,510)	$ (3,626)
Common stock balance (in shares) at Dec. 31, 2020		201,061,198
Treasury stock (in shares) at Dec. 31, 2020						(538,921)
Balance at Dec. 31, 2020	3,079,105	$ 201,061	1,371,385	1,558,363	(48,078)	$ (3,626)
Net income	291,597
Other comprehensive income	1,653
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	$ (4,127)
Common stock balance (in shares) at Sep. 30, 2021	203,889,661	203,889,661
Treasury stock (in shares) at Sep. 30, 2021						(538,921)
Balance at Sep. 30, 2021	$ 3,332,278	$ 203,889	1,458,208	1,720,232	(46,425)	$ (3,626)
Common stock balance (in shares) at Mar. 31, 2021		201,733,458
Treasury stock (in shares) at Mar. 31, 2021						(538,921)
Balance at Mar. 31, 2021	3,100,306	$ 201,733	1,382,158	1,567,551	(47,510)	$ (3,626)
Net income	100,190			100,190
Other comprehensive income	542				542
Dividends declared on common stock	(43,336)			(43,336)
Stock-based compensation	6,150		6,150
Issuance of common stock (shares)		1,088,843
Issuance of common stock	34,950	$ 1,089	33,861
Common stock balance (in shares) at Jun. 30, 2021		202,822,301
Treasury stock (in shares) at Jun. 30, 2021						(538,921)
Balance at Jun. 30, 2021	3,198,802	$ 202,822	1,422,169	1,624,405	(46,968)	$ (3,626)
Net income	139,276			139,276
Other comprehensive income	543				543
Dividends declared on common stock	(43,449)			(43,449)
Stock-based compensation	2,925		2,925
Issuance of common stock (shares)		1,067,360
Issuance of common stock	$ 34,181	$ 1,067	33,114
Common stock balance (in shares) at Sep. 30, 2021	203,889,661	203,889,661
Treasury stock (in shares) at Sep. 30, 2021						(538,921)
Balance at Sep. 30, 2021	$ 3,332,278	$ 203,889	1,458,208	1,720,232	(46,425)	$ (3,626)
Common stock balance (in shares) at Dec. 31, 2021	203,889,661	203,889,661
Treasury stock (in shares) at Dec. 31, 2021						(538,921)
Balance at Dec. 31, 2021	$ 3,382,874	$ 203,889	1,461,205	1,762,410	(41,004)	$ (3,626)
Net income	31,763			31,763
Other comprehensive income	269				269
Dividends declared on common stock	(44,447)			(44,447)
Stock-based compensation	2,689		2,689
Repurchase of common stock						(266,821)
Repurchase of common stock	(7,399)					$ (7,399)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			(12,303)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						266,821
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						$ 7,399
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	(4,904)
Issuance of common stock	(127)		(127)
Common stock balance (in shares) at Mar. 31, 2022		203,889,661
Treasury stock (in shares) at Mar. 31, 2022						(538,921)
Balance at Mar. 31, 2022	$ 3,360,718	$ 203,889	1,451,464	1,749,726	(40,735)	$ (3,626)
Common stock balance (in shares) at Dec. 31, 2021	203,889,661	203,889,661
Treasury stock (in shares) at Dec. 31, 2021						(538,921)
Balance at Dec. 31, 2021	$ 3,382,874	$ 203,889	1,461,205	1,762,410	(41,004)	$ (3,626)
Net income	250,401
Other comprehensive income	(2,242)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	$ (4,904)
Common stock balance (in shares) at Sep. 30, 2022	203,889,661	203,889,661
Treasury stock (in shares) at Sep. 30, 2022						(538,921)
Balance at Sep. 30, 2022	$ 3,491,858	$ 203,889	1,455,241	1,879,600	(43,246)	$ (3,626)
Common stock balance (in shares) at Mar. 31, 2022		203,889,661
Treasury stock (in shares) at Mar. 31, 2022						(538,921)
Balance at Mar. 31, 2022	3,360,718	$ 203,889	1,451,464	1,749,726	(40,735)	$ (3,626)
Net income	70,667			70,667
Other comprehensive income	(2,796)				(2,796)
Dividends declared on common stock	(44,446)			(44,446)
Stock-based compensation	2,689		2,689
Issuance of common stock	(22)		(22)
Common stock balance (in shares) at Jun. 30, 2022		203,889,661
Treasury stock (in shares) at Jun. 30, 2022						(538,921)
Balance at Jun. 30, 2022	3,386,810	$ 203,889	1,454,131	1,775,947	(43,531)	$ (3,626)
Net income	147,971			147,971
Other comprehensive income	285				285
Dividends declared on common stock	(44,318)			(44,318)
Stock-based compensation	$ 1,110		1,110
Common stock balance (in shares) at Sep. 30, 2022	203,889,661	203,889,661
Treasury stock (in shares) at Sep. 30, 2022						(538,921)
Balance at Sep. 30, 2022	$ 3,491,858	$ 203,889	$ 1,455,241	$ 1,879,600	$ (43,246)	$ (3,626)

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net income	$ 250,401	$ 291,597
Discontinued operations, net of tax	103	348
Income from continuing operations	250,298	291,249
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	247,173	222,613
Deferred income taxes	18,741	30,353
Provision for credit losses	3,258	(801)
Amortization of debt issuance costs	1,080	997
Employee stock-based compensation costs	6,488	11,649
Pension and postretirement benefit plan net periodic benefit credit	(4,515)	(3,690)
Unrealized (gains) losses on investments	15,529	(4,408)
Gains on sales of assets	(8,500)	(10,518)
Changes in current assets and liabilities, net of acquisitions:
Receivables	(346,879)	(103,637)
Inventories	(60,670)	(21,402)
Other current assets	(31,405)	(74,413)
Accounts payable	148,456	33,173
Other current liabilities	62,106	14,175
Pension and postretirement benefit plan contributions	(375)	(326)
Other noncurrent changes	(15,835)	(19,129)
Net cash provided by continuing operations	284,950	365,885
Net cash used in discontinued operations	(17)	(75)
Net cash provided by operating activities	284,933	365,810
Investing activities:
Capital expenditures	(463,002)	(428,114)
Acquisitions, net of cash acquired	450	(13,721)
Net proceeds from sale or disposition of property and other	1,615	12,954
Investments	(4,411)	(3,777)
Net cash used in investing activities	(465,348)	(432,658)
Financing activities:
Issuance of short-term borrowings	100,000	50,000
Repayment of short-term borrowings	0	(50,000)
Issuance of long-term debt	270,250	178,879
Repayment of long-term debt	(23,155)	(63,835)
Debt issuance costs	(1,082)	(362)
Net proceeds from issuance of common stock	(149)	88,830
Dividends paid	(132,687)	(128,142)
Repurchase of common stock	(7,399)	(6,701)
Tax withholding on stock-based compensation	(4,904)	(4,127)
Net cash provided by financing activities	200,874	64,542
Increase (decrease) in cash and cash equivalents	20,459	(2,306)
Cash and cash equivalents -- beginning of year	54,161	59,547
Cash and cash equivalents -- end of period	$ 74,620	$ 57,241

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Basis of presentation

9 Months Ended

Sep. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of presentation

Basis of presentation

The accompanying consolidated interim financial statements were prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Interim financial statements do not include all disclosures provided in annual financial statements and, accordingly, these financial statements should be read in conjunction with those appearing in the 2021 Annual Report. The information is unaudited but includes all adjustments that are, in the opinion of management, necessary for a fair presentation of the accompanying consolidated interim financial statements and are of a normal recurring nature. Depreciation, depletion and amortization expense is reported separately on the Consolidated Statements of Income and therefore is excluded from the other line items within operating expenses.

On August 4, 2022, the Company announced its Board of Directors unanimously approved a plan to pursue the separation of Knife River from the Company. The separation is planned as a tax-free spinoff transaction to the Company’s stockholders for U.S. federal income tax purposes. As the next step of the Company’s strategic planning, on November 2, 2022, the board of directors unanimously determined the best way to optimize value would be to create two pure-play companies: a leading construction materials company and a regulated energy delivery company. Accordingly, the board has authorized management to commence a strategic review process for MDU Construction Services with the objective of achieving the board’s goal of creating two pure-play public companies.

Discontinued operations include the supporting activities of Fidelity and are shown in income from discontinued operations on the Consolidated Statements of Income. Unless otherwise indicated, the amounts presented in the accompanying notes to the consolidated financial statements relate to the Company's continuing operations.

In the fourth quarter of 2021, the Company made changes to the presentation of the Consolidated Statements of Cash Flows to provide further clarity on the sources and uses of net cash provided by operating activities and net cash provided by (used in) financing activities. Certain prior period amounts have been reclassified to conform to the current year presentation. These reclassifications did not impact total net cash provided by operating activities or net cash provided by financing activities for the nine months ended September 30, 2021.

Management has also evaluated the impact of events occurring after September 30, 2022, up to the date of the issuance of these consolidated interim financial statements on November 3, 2022, that would require recognition or disclosure in the Consolidated Financial Statements.

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New accounting standards

9 Months Ended

Sep. 30, 2022

Accounting Standards Update and Change in Accounting Principle [Abstract]

New accounting standards

New accounting standards

The following table provides a brief description of the accounting pronouncements applicable to the Company and the potential impact on its Consolidated Financial Statements and/or disclosures:

Standard	Description	Effective date	Impact on financial statements/disclosures
ASU 2021-10 - Government Assistance	In November 2021, the FASB issued guidance on modifying the disclosure requirements to increase the transparency of government assistance including disclosure of the types of assistance, an entity's accounting for the assistance and the effect of the assistance on an entity's financial statements.	January 1, 2022	The Company is currently evaluating the impact the guidance will have on its disclosures for the year ended December 31, 2022.
ASU 2020-04 - Reference Rate Reform	In March 2020, the FASB issued optional guidance to ease the facilitation of the effects of reference rate reform on financial reporting. The guidance applies to certain contract modifications, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Beginning January 1, 2022, LIBOR or other discontinued reference rates cannot be applied to new contracts. New contracts will incorporate a new reference rate, which includes SOFR. LIBOR or other discontinued reference rates cannot be applied to contract modifications or hedging relationships entered into or evaluated after December 31, 2022. Existing contracts referencing LIBOR or other reference rates expected to be discontinued must identify a replacement rate by June 30, 2023.	Effective as of March 12, 2020 and will continue through December 31, 2022	The Company has updated its credit agreements to include language regarding the successor or alternate rate to LIBOR, and a review of other contracts and agreements is on-going. The Company does not expect the guidance to have a material impact on its results of operations, financial position, cash flows or disclosures.

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Seasonality of operations	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Seasonality of operations	Seasonality of operations Some of the Company's operations are highly seasonal and revenues from, and certain expenses for, such operations may fluctuate significantly among quarterly periods. Accordingly, the interim results for particular businesses, and for the Company as a whole, may not be indicative of results for the full fiscal year.

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Receivables and allowance for expected credit losses

9 Months Ended

Sep. 30, 2022

Credit Loss [Abstract]

Receivables and allowance for expected credit loss

Receivables and allowance for expected credit losses

Receivables consists primarily of trade receivables from the sale of goods and services, which are recorded at the invoiced amount, and contract assets, net of expected credit losses. For more information on contract assets, see Note 9. The Company's trade receivables are all due in 12 months or less. The total balance of receivables past due 90 days or more was $41.5 million, $37.9 million and $44.8 million at September 30, 2022 and 2021, and December 31, 2021, respectively.

The Company's expected credit losses are determined through a review using historical credit loss experience; changes in asset specific characteristics; current conditions; and reasonable and supportable future forecasts, among other specific account data, and is performed at least quarterly. The Company develops and documents its methodology to determine its allowance for expected credit losses at each of its reportable business segments. Risk characteristics used by the business segments may include customer mix, knowledge of customers and general economic conditions of the various local economies, among others. Specific account balances are written off when management determines the amounts to be uncollectible. Management has reviewed the balance reserved through the allowance for expected credit losses and believes it is reasonable.

Details of the Company's expected credit losses were as follows:

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2021	$	269	$	1,506	$	2	$	5,406	$	2,533	$	9,716
Current expected credit loss provision	565		1,369		—		(253)		54		1,735
Less write-offs charged against the allowance	597		932		—		27		71		1,627
Credit loss recoveries collected	124		180		—		—		28		332
At March 31, 2022	$	361	$	2,123	$	2	$	5,126	$	2,544	$	10,156
Current expected credit loss provision	113		92		—		12		292		509
Less write-offs charged against the allowance	234		939		—		108		104		1,385
Credit loss recoveries collected	108		177		—		—		—		285
At June 30, 2022	$	348	$	1,453	$	2	$	5,030	$	2,732	$	9,565
Current expected credit loss provision	300		881		—		(55)		(111)		1,015
Less write-offs charged against the allowance	399		1,822		—		75		152		2,448
Credit loss recoveries collected	85		169		—		—		40		294
At September 30, 2022	$	334	$	681	$	2	$	4,900	$	2,509	$	8,426

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2020	$	899	$	2,571	$	2	$	6,164	$	5,722	$	15,358
Current expected credit loss provision	538		1,273		—		(1,049)		(1,079)		(317)
Less write-offs charged against the allowance	888		1,107		—		273		401		2,669
Credit loss recoveries collected	129		213		—		—		—		342
At March 31, 2021	$	678	$	2,950	$	2	$	4,842	$	4,242	$	12,714
Current expected credit loss provision	(110)		(103)		—		11		(639)		(841)
Less write-offs charged against the allowance	341		787		—		232		64		1,424
Credit loss recoveries collected	100		199		—		—		—		299
At June 30, 2021	$	327	$	2,259	$	2	$	4,621	$	3,539	$	10,748
Current expected credit loss provision	388		411		—		233		(675)		357
Less write-offs charged against the allowance	525		1,178		—		184		265		2,152
Credit loss recoveries collected	92		168		—		—		93		353
At September 30, 2021	$	282	$	1,660	$	2	$	4,670	$	2,692	$	9,306

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Inventories and natural gas in storage

9 Months Ended

Sep. 30, 2022

Inventory Disclosure [Abstract]

Inventories and natural gas in storage

Inventories and natural gas in storage

Natural gas in storage for the Company's regulated operations is generally valued at lower of cost or market using the last-in, first-out method or lower of cost or net realizable value using the average cost or first-in, first-out method. The majority of all other inventories are valued at the lower of cost or net realizable value using the average cost method. The portion of the cost of natural gas in storage expected to be used within 12 months was included in inventories. Inventories on the Consolidated Balance Sheets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Aggregates held for resale	$	198,711	$	183,693	$	184,363
Asphalt oil	56,609		32,964		57,002
Natural gas in storage (current)	48,532		28,683		18,867
Materials and supplies	42,359		27,253		30,629
Merchandise for resale	39,198		26,639		28,501
Other	13,233		13,053		16,247
Total	$	398,642	$	312,285	$	335,609

The remainder of natural gas in storage, which largely represents the cost of gas required to maintain pressure levels for normal operating purposes, was included in noncurrent assets - other and was $47.2 million at September 30, 2022 and $47.5 million at both September 30, 2021 and December 31, 2021.

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Earnings per share

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Earnings per share

Earnings per share

Basic earnings per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the applicable period. Diluted earnings per share is computed by dividing net income by the total of the weighted average number of shares of common stock outstanding during the applicable period, plus the effect of non-vested performance share awards and restricted stock units. Common stock outstanding includes issued shares less shares held in treasury. Net income was the same for both the basic and diluted earnings per share calculations. A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands, except per share amounts)
Weighted average common shares outstanding - basic	203,351		202,863		203,351		201,647
Effect of dilutive performance share awards and restricted stock units	293		327		56		308
Weighted average common shares outstanding - diluted	203,644		203,190		203,407		201,955
Shares excluded from the calculation of diluted earnings per share	—		—		77		—
Dividends declared per common share	$	.2175	$	.2125	$	.6525	$	.6375

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Equity

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Equity

Equity

The Company currently has a shelf registration statement on file with the SEC, under which the Company may issue and sell any combination of common stock and debt securities. The Company may sell such securities if warranted by market conditions and the Company's capital requirements.

In August 2020, the Company amended the Distribution Agreement dated February 22, 2019, with J.P. Morgan Securities LLC and MUFG Securities Americas Inc., as sales agents. This agreement, as amended, allows the offering, issuance and sale of up to 6.4 million shares of the Company's common stock in connection with an "at-the-market" offering. The common stock may be offered for sale, from time to time, in accordance with the terms and conditions of this agreement. As of September 30, 2022, the Company had capacity to issue up to 3.6 million additional shares of common stock under the "at-the-market" offering program.

Details of the Company's "at-the-market" offering activity was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2022		2021			2022		2021
	(In millions)
Shares issued	—		1.0			—		2.8
Net proceeds *	$	—	$	34.2	**	$	(.1)	$	88.8	**

*    Net proceeds include issuance costs of $— and $149,000 for the three and nine months ended September 30, 2022, respectively, and $425,000 and $1.2 million for the three and nine months ended September 30, 2021, respectively.

**    Net proceeds were used for capital expenditures.

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Accumulated other comprehensive loss

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Accumulated other comprehensive loss

Accumulated other comprehensive loss

The after-tax changes in the components of accumulated other comprehensive loss were as follows:

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2021	$	(538)	$	(40,461)	$	(5)	$	(41,004)
Other comprehensive loss before reclassifications	—		—		(320)		(320)
Amounts reclassified from accumulated other comprehensive loss	112		445		32		589
Net current-period other comprehensive income (loss)	112		445		(288)		269
At March 31, 2022	$	(426)	$	(40,016)	$	(293)	$	(40,735)
Other comprehensive loss before reclassifications	—		—		(128)		(128)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset	—		(3,265)		—		(3,265)
Amounts reclassified from accumulated other comprehensive loss	111		461		25		597
Net current-period other comprehensive income (loss)	111		(2,804)		(103)		(2,796)
At June 30, 2022	$	(315)	$	(42,820)	$	(396)	$	(43,531)
Other comprehensive loss before reclassifications	—		—		(329)		(329)
Amounts reclassified from accumulated other comprehensive loss	111		461		42		614
Net current-period other comprehensive income (loss)	111		461		(287)		285
At September 30, 2022	$	(204)	$	(42,359)	$	(683)	$	(43,246)

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2020	$	(984)	$	(47,207)	$	113	$	(48,078)
Other comprehensive loss before reclassifications	—		—		(44)		(44)
Amounts reclassified from accumulated other comprehensive loss	111		466		35		612
Net current-period other comprehensive income (loss)	111		466		(9)		568
At March 31, 2021	$	(873)	$	(46,741)	$	104	$	(47,510)
Other comprehensive loss before reclassifications	—		—		(52)		(52)
Amounts reclassified from accumulated other comprehensive loss	112		457		25		594
Net current-period other comprehensive income (loss)	112		457		(27)		542
At June 30, 2021	$	(761)	$	(46,284)	$	77	$	(46,968)
Other comprehensive loss before reclassifications	—		—		(54)		(54)
Amounts reclassified from accumulated other comprehensive loss	111		466		20		597
Net current-period other comprehensive income (loss)	111		466		(34)		543
At September 30, 2021	$	(650)	$	(45,818)	$	43	$	(46,425)

The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended				Nine Months Ended				Location on Consolidated Statements of Income
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	(148)	$	(147)	$	(443)	$	(443)	Interest expense
	37		36		109		109		Income taxes
	(111)		(111)		(334)		(334)
Amortization of postretirement liability losses included in net periodic benefit credit	(609)		(617)		(1,827)		(1,851)		Other income
	148		151		460		462		Income taxes
	(461)		(466)		(1,367)		(1,389)
Reclassification adjustment on available-for-sale investments included in net income	(54)		(26)		(126)		(101)		Other income
	12		6		27		21		Income taxes
	(42)		(20)		(99)		(80)
Total reclassifications	$	(614)	$	(597)	$	(1,800)	$	(1,803)

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Revenue from contracts with customers

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Revenue from contracts with customers

Revenue from contracts with customers

Revenue is recognized when a performance obligation is satisfied by transferring control over a product or service to a customer. Revenue is measured based on consideration specified in a contract with a customer and excludes any sales incentives and amounts collected on behalf of third parties. The Company is considered an agent for certain taxes collected from customers. As such, the Company presents revenues net of these taxes at the time of sale to be remitted to governmental authorities, including sales and use taxes.

Disaggregation

In the following tables, revenue is disaggregated by the type of customer or service provided. The Company believes this level of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The table also includes a reconciliation of the disaggregated revenue by reportable segments. For more information on the Company's business segments, see Note 17.

Three Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,981	$	64,074	$	—	$	—	$	—	$	—	$	101,055
Commercial utility sales	38,785		43,734		—		—		—		—		82,519
Industrial utility sales	10,838		7,209		—		—		—		—		18,047
Other utility sales	2,002		—		—		—		—		—		2,002
Natural gas transportation	—		11,910		32,144		—		—		—		44,054
Natural gas storage	—		—		3,595		—		—		—		3,595
Contracting services	—		—		—		492,207		—		—		492,207
Construction materials	—		—		—		742,982		—		—		742,982
Intrasegment eliminations	—		—		—		(259,761)		—		—		(259,761)
Electrical & mechanical specialty contracting	—		—		—		—		543,717		—		543,717
Transmission & distribution specialty contracting	—		—		—		—		181,550		—		181,550
Other	10,758		3,494		3,815		—		200		4,438		22,705
Intersegment eliminations	(124)		(139)		(3,595)		(343)		(2,229)		(4,438)		(10,868)
Revenues from contracts with customers	99,240		130,282		35,959		975,085		723,238		—		1,963,804
Other revenues	(47)		1,792		86		—		11,571		—		13,402
Total external operating revenues	$	99,193	$	132,074	$	36,045	$	975,085	$	734,809	$	—	$	1,977,206

Three Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,412	$	55,284	$	—	$	—	$	—	$	—	$	91,696
Commercial utility sales	39,033		35,338		—		—		—		—		74,371
Industrial utility sales	10,495		5,395		—		—		—		—		15,890
Other utility sales	1,993		—		—		—		—		—		1,993
Natural gas transportation	—		11,812		28,058		—		—		—		39,870
Natural gas storage	—		—		3,483		—		—		—		3,483
Contracting services	—		—		—		415,106		—		—		415,106
Construction materials	—		—		—		617,823		—		—		617,823
Intrasegment eliminations	—		—		—		(201,630)		—		—		(201,630)
Electrical & mechanical specialty contracting	—		—		—		—		317,238		—		317,238
Transmission & distribution specialty contracting	—		—		—		—		185,842		—		185,842
Other	12,589		2,110		3,290		—		75		3,423		21,487
Intersegment eliminations	(136)		(142)		(3,908)		(110)		(289)		(3,398)		(7,983)
Revenues from contracts with customers	100,386		109,797		30,923		831,189		502,866		25		1,575,186
Other revenues	(1,456)		581		45		—		11,657		—		10,827
Total external operating revenues	$	98,930	$	110,378	$	30,968	$	831,189	$	514,523	$	25	$	1,586,013

Nine Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	103,648	$	439,639	$	—	$	—	$	—	$	—	$	543,287
Commercial utility sales	108,400		279,697		—		—		—		—		388,097
Industrial utility sales	32,067		29,242		—		—		—		—		61,309
Other utility sales	5,632		—		—		—		—		—		5,632
Natural gas transportation	—		35,747		95,685		—		—		—		131,432
Natural gas storage	—		—		10,210		—		—		—		10,210
Contracting services	—		—		—		937,156		—		—		937,156
Construction materials	—		—		—		1,535,077		—		—		1,535,077
Intrasegment eliminations	—		—		—		(475,026)		—		—		(475,026)
Electrical & mechanical specialty contracting	—		—		—		—		1,443,758		—		1,443,758
Transmission & distribution specialty contracting	—		—		—		—		496,190		—		496,190
Other	33,727		9,854		8,200		—		357		13,168		65,306
Intersegment eliminations	(371)		(416)		(37,328)		(674)		(5,090)		(13,168)		(57,047)
Revenues from contracts with customers	283,103		793,763		76,767		1,996,533		1,935,215		—		5,085,381
Other revenues	(4,854)		(831)		210		—		34,780		—		29,305
Total external operating revenues	$	278,249	$	792,932	$	76,977	$	1,996,533	$	1,969,995	$	—	$	5,114,686

Nine Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	99,106	$	341,901	$	—	$	—	$	—	$	—	$	441,007
Commercial utility sales	105,795		203,002		—		—		—		—		308,797
Industrial utility sales	30,878		20,387		—		—		—		—		51,265
Other utility sales	5,384		—		—		—		—		—		5,384
Natural gas transportation	—		35,715		85,160		—		—		—		120,875
Natural gas storage	—		—		10,606		—		—		—		10,606
Contracting services	—		—		—		791,964		—		—		791,964
Construction materials	—		—		—		1,332,997		—		—		1,332,997
Intrasegment eliminations	—		—		—		(394,126)		—		—		(394,126)
Electrical & mechanical specialty contracting	—		—		—		—		1,020,130		—		1,020,130
Transmission & distribution specialty contracting	—		—		—		—		502,328		—		502,328
Other	31,827		7,913		10,760		—		168		10,152		60,820
Intersegment eliminations	(407)		(425)		(38,000)		(314)		(2,128)		(10,082)		(51,356)
Revenues from contracts with customers	272,583		608,493		68,526		1,730,521		1,520,498		70		4,200,691
Other revenues	(5,329)		5,880		127		—		36,239		—		36,917
Total external operating revenues	$	267,254	$	614,373	$	68,653	$	1,730,521	$	1,556,737	$	70	$	4,237,608

Presented in the previous tables are intrasegment revenues within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.

Contract balances

The timing of revenue recognition may differ from the timing of invoicing to customers. The timing of invoicing to customers does not necessarily correlate with the timing of revenues being recognized under the cost-to-cost method of accounting. Contracts for construction work are billed as work progresses in accordance with agreed upon contractual terms. Generally, billing to the customer occurs contemporaneous to revenue recognition. A variance in timing of the billings may result in a contract asset or a contract liability. A contract asset occurs when revenues are recognized under the cost-to-cost measure of progress, which exceeds amounts billed on uncompleted contracts. Such amounts will be billed as standard contract terms allow, usually based on various measures of performance or achievement. A contract liability occurs when there are billings in excess of revenues recognized under the cost-to-cost measure of progress on uncompleted contracts. Contract liabilities decrease as revenue is recognized from the satisfaction of the related performance obligation.

The changes in contract assets and liabilities were as follows:

	September 30, 2022		December 31, 2021		Change		Location on Consolidated Balance Sheets
	(In thousands)
Contract assets	$	265,585	$	125,742	$	139,843	Receivables, net
Contract liabilities - current	(216,439)		(179,140)		(37,299)		Accounts payable
Contract liabilities - noncurrent	(12)		(118)		106		Noncurrent liabilities - other
Net contract assets (liabilities)	$	49,134	$	(53,516)	$	102,650

The Company recognized $11.2 million and $147.9 million in revenue for the three and nine months ended September 30, 2022, respectively, which was previously included in contract liabilities at December 31, 2021. The Company recognized $7.1 million and $152.4 million in revenue for the three and nine months ended September 30, 2021, respectively, which was previously included in contract liabilities at December 31, 2020.

The Company recognized a net increase in revenues of $14.5 million and $54.1 million for the three and nine months ended September 30, 2022, respectively, from performance obligations satisfied in prior periods. The company recognized a net increase in revenues of $19.2 million and $63.3 million for the three and nine months ended September 30, 2021, respectively, from performance obligations satisfied in prior periods.

Remaining performance obligations

The remaining performance obligations, also referred to as backlog, at the construction materials and contracting and construction services segments include unrecognized revenues that the Company reasonably expects to be realized. These unrecognized revenues can include: projects that have a written award, a letter of intent, a notice to proceed, an agreed upon work order to perform work on mutually accepted terms and conditions and change orders or claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under master service agreements. The majority of the Company's construction contracts have an original duration of less than two years.

The remaining performance obligations at the pipeline segment include firm transportation contracts with fixed pricing and fixed volumes. The Company has applied the practical expedient, which does not require additional disclosures for contracts with an original duration of less than 12 months, to certain firm transportation and non-regulated contracts. The Company's firm transportation contracts included in the remaining performance obligations have weighted average remaining durations of less than five years.

At September 30, 2022, the Company's remaining performance obligations were $3.3 billion. The Company expects to recognize the following revenue amounts in future periods related to these remaining performance obligations: $2.6 billion within the next 12 months or less; $369.7 million within the next 13 to 24 months; and $418.1 million in 25 months or more.

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Business Combinations

9 Months Ended

Sep. 30, 2022

Business Combinations [Abstract]

Business Combinations

Business combinations

The following acquisitions were accounted for as business combinations in accordance with ASC 805 - Business Combinations. The results of the acquired businesses have been included in the Consolidated Financial Statements beginning on the acquisition date. Pro forma financial amounts reflecting the effects of the business combinations are not presented, as none of these business combinations, individually or in the aggregate, were material to the Company's financial position or results of operations.

The acquisitions are also subject to customary adjustments based on, among other things, the amount of cash, debt and working capital in the business as of the closing date. The amounts included in the Consolidated Balance Sheets for these adjustments are considered provisional until final settlement has occurred.

The Company had no acquisitions in the nine months ended September 30, 2022.

In 2021, the construction materials and contracting segment's acquisitions included:

•Baker Rock Resources and Oregon Mainline Paving, two construction materials companies located around the Portland, Oregon metro area, acquired in November 2021. As of September 30, 2022, the purchase price allocation was settled with no material adjustments to the provisional accounting.

•Mt. Hood Rock, a construction aggregates business in Oregon, acquired in April 2021. As of March 31, 2022, the purchase price allocation was settled with no material adjustments to the provisional accounting.

In 2021, the total purchase price for acquisitions was $236.1 million, subject to certain adjustments, with cash acquired totaling $900,000. The purchase price includes consideration paid of $235.2 million. The amounts allocated to the aggregated assets acquired and liabilities assumed during 2021 were as follows: $17.0 million to current assets; $179.8 million to property, plant and equipment; $50.6 million to goodwill; $2.2 million to other intangible assets; $8.7 million to current liabilities; $2.5 million to noncurrent liabilities - other; and $3.2 million to deferred tax liabilities. During the first quarter of 2022, measurement period adjustments were made to previously reported provisional amounts, which decreased goodwill and increased property, plant and equipment by $2.1 million. The Company issued debt to finance these acquisitions.

Costs incurred for acquisitions are included in operation and maintenance expense on the Consolidated Statements of Income. For the nine months ended September 30, 2022, the Company had no acquisition costs. For the nine months ended September 30, 2021, acquisition costs were not material.

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Leases

9 Months Ended

Sep. 30, 2022

Leases [Abstract]

Lessee, Operating Leases

Leases

The Company's leases primarily include operating leases for equipment, buildings, easements and vehicles. The Company leases certain equipment to third parties through its utility and construction services segments, which are considered short-term operating leases with terms of less than 12 months.

The Company recognized revenue from operating leases of $11.7 million and $35.1 million for the three and nine months ended September 30, 2022, respectively. The Company recognized revenue from operating leases of $11.8 million and $36.6 million for the three and nine months ended September 30, 2021, respectively. At September 30, 2022, the Company had $9.1 million of lease receivables with a majority due within 12 months.

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Goodwill and other intangible assets

9 Months Ended

Sep. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and other intangible assets

Goodwill and other intangible assets

The changes in the carrying amount of goodwill were as follows:

	Balance at January 1, 2022		Goodwill Acquired During  the Year		Measurement Period Adjustments		Balance at September 30, 2022
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	276,426		—		(2,124)		274,302
Construction services	143,224		—		—		143,224
Total	$	765,386	$	—	$	(2,124)	$	763,262

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		2,900		(217)		228,686
Construction services	143,224		—		—		143,224
Total	$	714,963	$	2,900	$	(217)	$	717,646

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		50,640		(217)		276,426
Construction services	143,224		—		—		143,224
Total	$	714,963	$	50,640	$	(217)	$	765,386

Other amortizable intangible assets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Customer relationships	$	28,990	$	29,423	$	29,740
Less accumulated amortization	12,768		9,705		10,650
	16,222		19,718		19,090
Noncompete agreements	4,591		3,991		4,591
Less accumulated amortization	3,377		2,710		2,856
	1,214		1,281		1,735
Other	5,279		11,957		12,601
Less accumulated amortization	3,970		10,715		10,848
	1,309		1,242		1,753
Total	$	18,745	$	22,241	$	22,578

The previous tables include goodwill and intangible assets associated with the business combinations completed during 2021. For more information related to these business combinations, see Note 10.

Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2022, was $1.3 million and $3.8 million, respectively. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2021, was $1.2 million and $3.9 million, respectively. Estimated amortization expense for identifiable intangible assets as of September 30, 2022, was:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Amortization expense	$	1,159	$	4,591	$	4,249	$	2,200	$	1,781	$	4,765

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Regulatory assets and liabilities

9 Months Ended

Sep. 30, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

Regulatory assets and liabilities

The following table summarizes the individual components of unamortized regulatory assets and liabilities:

	Estimated Recovery or Refund Period as of September 30, 2022	*	September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Regulatory assets:
Current:
Natural gas costs recoverable through rate adjustments	Up to 1 year		$	112,079	$	98,211	$	86,371
Conservation programs	Up to 1 year		9,363		8,495		8,225
Decoupling	Up to 1 year		6,549		7,195		9,131
Cost recovery mechanisms	Up to 1 year		3,354		4,693		4,536
Other	Up to 1 year		16,815		14,541		10,428
			148,160		133,135		118,691
Noncurrent:
Pension and postretirement benefits	**		137,582		155,888		142,681
Cost recovery mechanisms	Up to 10 years		67,094		43,955		44,870
Plant costs/asset retirement obligations	Over plant lives		61,941		73,528		63,116
Plant to be retired	-		24,740		48,544		50,070
Manufactured gas plant site remediation	-		25,963		26,000		26,053
Taxes recoverable from customers	Over plant lives		12,394		11,438		12,339
Long-term debt refinancing costs	Up to 38 years		3,335		3,952		3,794
Natural gas costs recoverable through rate adjustments	Up to 2 years		462		6,084		5,186
Other	Up to 17 years		10,931		9,856		9,742
			344,442		379,245		357,851
Total regulatory assets			$	492,602	$	512,380	$	476,542
Regulatory liabilities:
Current:
Taxes refundable to customers	Up to 1 year		$	4,264	$	3,867	$	3,841
Electric fuel and purchased power deferral	Up to 1 year		3,763		3,205		—
Cost recovery mechanisms	Up to 1 year		2,674		2,797		214
Natural gas costs refundable through rate adjustments	Up to 1 year		873		—		6,700
Other	Up to 1 year		7,025		6,622		5,548
			18,599		16,491		16,303
Noncurrent:
Taxes refundable to customers	Over plant lives		205,517		218,566		215,421
Plant removal and decommissioning costs	Over plant lives		174,481		172,683		168,152
Pension and postretirement benefits	**		19,687		16,915		20,434
Accumulated deferred investment tax credit	Up to 20 years		14,665		12,403		12,696
Cost recovery mechanisms	Up to 20 years		12,535		—		7,727
Other	Up to 16 years		6,327		5,574		4,360
			433,212		426,141		428,790
Total regulatory liabilities			$	451,811	$	442,632	$	445,093
Net regulatory position			$	40,791	$	69,748	$	31,449

*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers.

**    Recovered as expense is incurred or cash contributions are made.

At September 30, 2022 and 2021, and December 31, 2021, approximately $264.4 million, $318.2 million and $296.6 million, respectively, of regulatory assets were not earning a rate of return; however, these regulatory assets are expected to be recovered from customers in future rates. These assets are largely comprised of the unfunded portion of pension and postretirement benefits, asset retirement obligations, accelerated depreciation on plant retirement and the estimated future cost of manufactured gas plant site remediation.

In the last half of 2021 and in 2022, the Company has experienced higher natural gas costs due to the increase in demand outpacing the supply along with the impact of global events. This increase in natural gas costs experienced in certain jurisdictions has been partially offset by the recovery of prior period natural gas costs being recovered over a period longer than the normal one-year period, as further discussed below.

In February 2021, a prolonged period of unseasonably cold temperatures in the central United States significantly increased the demand for electric and natural gas services and contributed to increased market prices. Overall, Montana-Dakota and Great Plains incurred approximately $44.0 million in increased natural gas costs in order to maintain services for its customers. These extraordinary gas costs were recorded as regulatory assets as they are expected to be recovered from customers. With the exception of $845,000 in Minnesota, Montana-Dakota and Great Plains have received approval for the recovery of purchased gas adjustments related to the cold-weather event in all jurisdictions impacted, including out-of-cycle purchased gas adjustment requests in most jurisdictions. For a discussion of the Company's most recent cases by jurisdiction, see Note 19.

In 2019, the Company experienced increased natural gas costs in Washington from the rupture of the Enbridge pipeline in Canada in late 2018. As a result, the Company requested, and the WUTC approved, recovery through 2022 of the balance of natural gas costs recoverable related to this period of time, which was over three years rather than its normal one-year recovery period.

In February 2019, the Company announced the retirement of three aging coal-fired electric generating units. The Company accelerated the depreciation related to these facilities in property, plant and equipment and recorded the difference between the accelerated depreciation, in accordance with GAAP, and the depreciation approved for rate-making purposes as regulatory assets. Requests were filed with the NDPSC and SDPUC, and subsequently approved, to offset the savings associated with the cessation of operations of these units with the amortization of the deferred regulatory assets. The Company ceased operations of Lewis & Clark Station in March 2021 and Units 1 and 2 at Heskett Station in February 2022. The Company subsequently reclassified the costs being recovered for these facilities from plant retirement to cost recovery mechanisms in the previous table and began amortizing the associated plant retirement and closure costs in the jurisdictions where requests were filed, as previously discussed. The Company expects to recover the regulatory assets related to the plant retirements in future rates.

If, for any reason, the Company's regulated businesses cease to meet the criteria for application of regulatory accounting for all or part of their operations, the regulatory assets and liabilities relating to those portions ceasing to meet such criteria would be written off and included in the statement of income or accumulated other comprehensive loss in the period in which the discontinuance of regulatory accounting occurs.

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Fair value measurements

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Fair value measurements

Fair value measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The fair value ASC establishes a hierarchy for grouping assets and liabilities, based on the significance of inputs. The estimated fair values of the Company's assets and liabilities measured on a recurring basis are determined using the market approach.

The Company measures its investments in certain fixed-income and equity securities at fair value with changes in fair value recognized in income. The Company anticipates using these investments, which consist of insurance contracts, to satisfy its obligations under its unfunded, nonqualified defined benefit and defined contribution plans for executive officers and certain key management employees, and invests in these fixed-income and equity securities for the purpose of earning investment returns and capital appreciation. These investments, which totaled $95.2 million, $106.4 million and $109.6 million, at September 30, 2022 and 2021, and December 31, 2021, respectively, are classified as investments on the Consolidated Balance Sheets. The net unrealized loss on these investments was $2.6 million and $16.8 million for the three and nine months ended September 30, 2022, respectively. The net unrealized gain on these investments was $373,000 and $4.2 million for the three and nine months ended September 30, 2021. The change in fair value, which is considered part of the cost of the plan, is classified in other income on the Consolidated Statements of Income.

The Company did not elect the fair value option, which records gains and losses in income, for its available-for-sale securities, which include mortgage-backed securities and U.S. Treasury securities. These available-for-sale securities are recorded at fair value and are classified as investments on the Consolidated Balance Sheets. Unrealized gains or losses are recorded in accumulated other comprehensive loss. Details of available-for-sale securities were as follows:

September 30, 2022	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,486	$	—	$	783	$	7,703
U.S. Treasury securities	2,468		—		82		2,386
Total	$	10,954	$	—	$	865	$	10,089

September 30, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,597	$	93	$	11	$	8,679
U.S. Treasury securities	2,681		—		28		2,653
Total	$	11,278	$	93	$	39	$	11,332

December 31, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,702	$	51	$	47	$	8,706
U.S. Treasury securities	2,407		—		11		2,396
Total	$	11,109	$	51	$	58	$	11,102

The Company's assets measured at fair value on a recurring basis were as follows:

	Fair Value Measurements at September 30, 2022, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2022
	(In thousands)
Assets:
Money market funds	$	—	$	7,309	$	—	$	7,309
Insurance contracts*	—		95,170		—		95,170
Available-for-sale securities:
Mortgage-backed securities	—		7,703		—		7,703
U.S. Treasury securities	—		2,386		—		2,386
Total assets measured at fair value	$	—	$	112,568	$	—	$	112,568

*    The insurance contracts invest approximately 65 percent in fixed-income investments, 14 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.

	Fair Value Measurements at September 30, 2021, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	9,907	$	—	$	9,907
Insurance contracts*	—		106,371		—		106,371
Available-for-sale securities:
Mortgage-backed securities	—		8,679		—		8,679
U.S. Treasury securities	—		2,653		—		2,653
Total assets measured at fair value	$	—	$	127,610	$	—	$	127,610

*    The insurance contracts invest approximately 63 percent in fixed-income investments, 16 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 1 percent in cash equivalents.

	Fair Value Measurements at December 31, 2021, Using
	Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Balance at December 31, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	10,190	$	—	$	10,190
Insurance contracts*	—		109,603		—		109,603
Available-for-sale securities:
Mortgage-backed securities	—		8,706		—		8,706
U.S. Treasury securities	—		2,396		—		2,396
Total assets measured at fair value	$	—	$	130,895	$	—	$	130,895

*    The insurance contracts invest approximately 61 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.

The Company's money market funds are valued at the net asset value of shares held at the end of the period, based on published market quotations on active markets, or using other known sources including pricing from outside sources. The estimated fair value of the Company's mortgage-backed securities and U.S. Treasury securities are based on comparable market transactions, other observable inputs or other sources, including pricing from outside sources. The estimated fair value of the Company's insurance contracts are based on contractual cash surrender values that are determined primarily by investments in managed separate accounts of the insurer. These amounts approximate fair value. The managed separate accounts are valued based on other observable inputs or corroborated market data.

Though the Company believes the methods used to estimate fair value are consistent with those used by other market participants, the use of other methods or assumptions could result in a different estimate of fair value.

The Company applies the provisions of the fair value measurement standard to its nonrecurring, non-financial measurements, including long-lived asset impairments. These assets are not measured at fair value on an ongoing basis but are subject to fair value adjustments only in certain circumstances. The Company reviews the carrying value of its long-lived assets, excluding goodwill, whenever events or changes in circumstances indicate that such carrying amounts may not be recoverable.

The Company performed fair value assessments of the assets acquired and liabilities assumed in the business combinations that occurred during 2021. The fair value of these assets and liabilities were determined based on Level 2 and Level 3 inputs.

The Company's long-term debt is not measured at fair value on the Consolidated Balance Sheets and the fair value is being provided for disclosure purposes only. The fair value was categorized as Level 2 in the fair value hierarchy and was based on discounted future cash flows using current market interest rates. The estimated fair value of the Company's Level 2 long-term debt was as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Carrying amount	$	2,988,452	$	2,328,266	$	2,741,900
Fair value	$	2,647,387	$	2,599,907	$	2,984,866

The carrying amounts of the Company's remaining financial instruments included in current assets and current liabilities approximate their fair values.

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Debt

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Debt

Debt

Certain debt instruments of the Company's subsidiaries contain restrictive and financial covenants and cross-default provisions. In order to borrow under the debt agreements, the subsidiary companies must be in compliance with the applicable covenants and certain other conditions, all of which the subsidiaries, as applicable, were in compliance with at September 30, 2022. In the event the subsidiaries do not comply with the applicable covenants and other conditions, alternative sources of funding may need to be pursued.

Montana-Dakota's and Centennial's respective commercial paper programs are supported by revolving credit agreements. While the amount of commercial paper outstanding does not reduce available capacity under the respective revolving credit agreements, Montana-Dakota and Centennial do not issue commercial paper in an aggregate amount exceeding the available capacity under the credit agreements. The commercial paper borrowings may vary during the period, largely the result of fluctuations in working capital requirements due to the seasonality of certain operations of the Company's subsidiaries.

Short-term debt

Centennial On March 18, 2022, Centennial entered into a $100.0 million term loan agreement with a SOFR-based variable interest rate and a maturity date of March 17, 2023. The agreement contains customary covenants and provisions, including a covenant of Centennial not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent. The covenants also include certain restrictions on the sale of certain assets, loans and investments.

Long-term debt

Long-term Debt Outstanding Long-term debt outstanding was as follows:

	Weighted Average Interest Rate at September 30, 2022		September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Senior Notes due on dates ranging from October 22, 2022 to June 15, 2062	4.29	%	$	2,365,000	$	2,025,000	$	2,125,000
Commercial paper supported by revolving credit agreements	3.66	%	460,600		168,800		450,300
Credit agreements due on June 7, 2024	4.55	%	125,580		94,300		127,500
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029	7.32	%	35,000		35,000		35,000
Term Loan Agreement due on September 3, 2032	3.64	%	7,000		7,700		7,700
Other notes due on dates ranging from January 1, 2024 to January 1, 2061	.97	%	2,349		3,198		2,564
Less unamortized debt issuance costs			6,633		5,709		6,090
Less discount			444		23		74
Total long-term debt			2,988,452		2,328,266		2,741,900
Less current maturities			214,453		1,548		148,053
Net long-term debt			$	2,773,999	$	2,326,718	$	2,593,847

Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at September 30, 2022, were as follows:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Long-term debt maturities	$	147,253	$	77,923	$	646,983	$	177,802	$	140,802	$	1,804,766

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Cash flow information

9 Months Ended

Sep. 30, 2022

Supplemental Cash Flow Information [Abstract]

Cash flow information

Cash flow information

Cash expenditures for interest and income taxes were as follows:

	Nine Months Ended
	September 30,
	2022		2021
	(In thousands)
Interest, net*	$	75,425	$	59,876
Income taxes paid, net	$	17,664	$	61,250

*    AFUDC - borrowed was $2.4 million and $1.6 million for the nine months ended September 30, 2022 and 2021, respectively.

Noncash investing and financing transactions were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Right-of-use assets obtained in exchange for new operating lease liabilities	$	36,492	$	26,120	$	55,987
Property, plant and equipment additions in accounts payable	$	44,277	$	88,355	$	57,605
Debt assumed in connection with a business combination	$	—	$	—	$	10

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Business segment data

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Business segment data

Business segment data

The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer. The Company's operations are located within the United States.

The electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The natural gas distribution segment distributes natural gas in those states, as well as in Idaho, Minnesota, Oregon and Washington. These operations also supply related value-added services.

The pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides non-regulated cathodic protection and other energy-related services.

The construction materials and contracting segment mines, processes and sells construction aggregates (crushed stone, sand and gravel); produces and sells asphalt mix; and supplies ready-mix concrete. This segment focuses on vertical integration of its contracting services with its construction materials to support the aggregate-based product lines including aggregate placement, asphalt and concrete paving, and site development and grading. Although not common to all locations, other products include the sale of cement, asphalt oil for various commercial and roadway applications, various finished concrete products and other building materials and related contracting services. This segment operates in the central, southern and western United States, including Alaska and Hawaii.

The construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services across the United States. These specialty contracting services are provided to utilities and manufacturing, transportation, commercial, industrial, institutional, renewable and governmental customers. Its electrical and mechanical contracting services include construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. Its transmission and distribution contracting services include construction and maintenance of overhead and underground electrical, gas and communication infrastructure, as well as manufacturing and distribution of transmission line construction equipment and tools.

The Other category includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries. The function of the captive insurer is to fund the self-insured layers of the insured Company's general liability, automobile liability, pollution liability and other coverages. Centennial Capital also owns certain real and personal property. In addition, the Other category includes certain assets, liabilities and tax adjustments of the holding company primarily associated with corporate functions and certain general and administrative costs (reflected in operation and maintenance expense) and interest expense, which were previously allocated to the refining business and Fidelity and do not meet the criteria for income (loss) from discontinued operations, as well as transaction costs associated with the anticipated separation of Knife River.

Discontinued operations include the supporting activities of Fidelity other than certain general and administrative costs and interest expense as described above.

The information below follows the same accounting policies as described in Note 2 of the Notes to Consolidated Financial Statements in the 2021 Annual Report. Information on the Company's segments was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
External operating revenues:
Regulated operations:
Electric	$	99,193	$	98,930	$	278,249	$	267,254
Natural gas distribution	132,074		110,378		792,932		614,373
Pipeline	32,347		27,757		69,347		58,390
	263,614		237,065		1,140,528		940,017

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Non-regulated operations:
Pipeline	3,698		3,211		7,630		10,263
Construction materials and contracting	975,085		831,189		1,996,533		1,730,521
Construction services	734,809		514,523		1,969,995		1,556,737
Other	—		25		—		70
	1,713,592		1,348,948		3,974,158		3,297,591
Total external operating revenues	$	1,977,206	$	1,586,013	$	5,114,686	$	4,237,608
Intersegment operating revenues:
Regulated operations:
Electric	$	124	$	136	$	371	$	407
Natural gas distribution	139		142		416		425
Pipeline	3,508		3,845		36,845		37,530
	3,771		4,123		37,632		38,362
Non-regulated operations:
Pipeline	87		63		483		470
Construction materials and contracting	343		110		674		314
Construction services	2,229		289		5,090		2,128
Other	4,438		3,398		13,168		10,082
	7,097		3,860		19,415		12,994
Intersegment eliminations	(10,868)		(7,983)		(57,047)		(51,356)
Total intersegment operating revenues	$	—	$	—	$	—	$	—
Operating income (loss):
Electric	$	30,395	$	27,310	$	53,764	$	53,982
Natural gas distribution	(16,688)		(14,249)		38,929		42,925
Pipeline	14,963		12,284		39,447		35,896
Construction materials and contracting	147,367		133,712		157,116		171,274
Construction services	34,949		30,120		110,588		108,172
Other	(1,135)		(8)		(2,081)		(226)
Total operating income	$	209,851	$	189,169	$	397,763	$	412,023
Net income (loss):
Regulated operations:
Electric	$	21,596	$	20,564	$	37,476	$	41,618
Natural gas distribution	(18,058)		(15,390)		10,758		20,081
Pipeline	9,379		10,225		24,527		27,508
	12,917		15,399		72,761		89,207
Non-regulated operations:
Pipeline	492		356		(187)		1,166
Construction materials and contracting	102,764		96,282		95,337		116,865
Construction services	27,977		23,130		83,755		81,839
Other	3,783		3,795		(1,368)		2,172
	135,016		123,563		177,537		202,042
Income from continuing operations	147,933		138,962		250,298		291,249
Discontinued operations, net of tax	38		314		103		348
Net income	$	147,971	$	139,276	$	250,401	$	291,597

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Employee benefit plans

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Employee benefit plans

Employee benefit plans

Pension and other postretirement plans

The Company has noncontributory qualified defined benefit pension plans and other postretirement benefit plans for certain eligible employees.

Components of net periodic benefit credit for the Company's pension benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,630	$	2,455	$	7,892	$	7,365
Expected return on assets	(4,864)		(4,894)		(14,592)		(14,682)
Amortization of net actuarial loss	1,670		2,004		5,012		6,012
Net periodic benefit credit	$	(564)	$	(435)	$	(1,688)	$	(1,305)

Components of net periodic benefit credit for the Company's other postretirement benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400	$	1,062	$	1,200
Interest cost	474		466		1,422		1,398
Expected return on assets	(1,322)		(1,275)		(3,966)		(3,825)
Amortization of prior service credit	(350)		(349)		(1,050)		(1,047)
Amortization of net actuarial (gain) loss	(55)		6		(163)		18
Net periodic benefit credit, including amount capitalized	(899)		(752)		(2,695)		(2,256)
Less amount capitalized	48		46		132		129
Net periodic benefit credit	$	(947)	$	(798)	$	(2,827)	$	(2,385)

The components of net periodic benefit credit, other than the service cost component, are included in other income on the Consolidated Statements of Income. The service cost component is included in operation and maintenance expense on the Consolidated Statements of Income.

Nonqualified defined benefit plans

In addition to the qualified defined benefit pension plans reflected in the table at the beginning of this note, the Company also has unfunded, nonqualified defined benefit plans for executive officers and certain key management employees. The Company's net periodic benefit cost for these plans was $773,000 and $769,000 for the three months ended September 30, 2022 and 2021, respectively, and $2.3 million for both the nine months ended September 30, 2022 and 2021. The components of net periodic benefit cost for these plans are included in other income on the Consolidated Statements of Income.

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Regulatory matters

9 Months Ended

Sep. 30, 2022

Regulated Operations [Abstract]

Regulatory Matters

Regulatory matters The Company regularly reviews the need for electric and natural gas rate changes in each of the jurisdictions in which service is provided. The Company files for rate adjustments to seek recovery of operating costs and capital investments, as well as reasonable returns as allowed by regulators. Certain regulatory proceedings and cases may also contain recurring mechanisms that can have an annual true-up. Examples of these recurring mechanisms include: infrastructure riders, transmission trackers, renewable resource cost adjustment riders, as well as weather normalization and decoupling mechanisms. The following paragraphs summarize the Company's significant open regulatory proceedings and cases by jurisdiction including updates to those reported in the 2021 Annual Report and should be read in conjunction with previous filings. The Company is unable to predict the ultimate outcome of these matters, the timing of final decisions of the various regulators and courts, or the effect on the Company's results of operations, financial position or cash flows.

MNPUC

Great Plains defers the difference between the actual cost of gas spent to serve customers and that recovered from customers on a monthly basis. Annually, Great Plains prepares a true-up pursuant to the purchased gas adjustment tariff. On August 30, 2021, the MNPUC issued an order to allow Great Plains recovery of an out-of-cycle cost of gas adjustment of $8.8 million over a period of 27 months. The order was effective September 1, 2021, and was subject to a prudence review by the MNPUC. The requested increase was for the February 2021 extreme cold weather, primarily in the central United States, and market conditions surrounding the natural gas commodity market. On October 19, 2022, the MNPUC issued a final order disallowing $845,000 of the gas costs. These costs, which were deferred as a regulatory asset in natural gas costs recoverable through rate adjustments, were then recorded to expense as they were no longer recoverable from customers.

On June 1, 2022, Great Plains filed an application with the MNPUC for a decrease in its depreciation and amortization rates of approximately $1.2 million annually or a decrease from a combined rate of 4.5 percent to 2.8 percent. Great Plains has requested the rates be retroactive to January 1, 2022. This matter is pending before the MNPUC.

NDPSC

On May 16, 2022, Montana-Dakota filed an application with the NDPSC for an electric general rate increase of approximately $25.4 million annually or 12.3 percent above current rates. The requested increase is primarily to recover investments in production, transmission and distribution facilities and the associated depreciation, operation and maintenance expenses and taxes associated with the increased investment. The NDPSC has 7 months to render a final decision on the rate case. On July 14, 2022, the NDPSC approved an interim rate increase of approximately $10.9 million annually or 5.3 percent above current rates, subject to refund, for service rendered on and after July 15, 2022. The lower interim rate increase is largely due to excluding the recovery of Heskett Unit 4, which is expected to be in service in the first half of 2023.

On July 15, 2022, Montana-Dakota filed an application with the NDPSC to request an update to its transmission cost adjustment rider requesting to recover revenues of $12.9 million, which includes a true-up of the prior period adjustment, resulting in a decrease of $1.6 million from current rates. The request is to recover transmission-related expenses and the revenue requirement for transmission facilities not currently recovered through electric service rates. On October 5, 2022, the NDPSC approved the decrease with rates effective November 1, 2022.

Montana-Dakota has a renewable resource cost adjustment rate tariff that allows for annual adjustments for recent projected capital costs and related expenses for projects determined to be recoverable under the tariff. On November 1, 2022, Montana-Dakota filed an annual update to its renewable resource cost adjustment requesting to recover a revenue requirement of approximately $17.9 million annually. The update reflects a decrease of approximately $127,000 from the revenues currently included in rates.

WUTC

On September 30, 2021, Cascade filed an application with the WUTC for a natural gas rate increase of approximately $13.7 million annually or approximately 5.1 percent above current rates. The requested increase was primarily to recover investments made in infrastructure upgrades, as well as to recover 2021 wage increases. On March 22, 2022, Cascade filed a multi-party settlement and stipulation on behalf of Cascade and the staff of the WUTC that would result in a revenue requirement increase of approximately $10.7 million annually or approximately 4.0 percent above current rates. The WUTC issued a final order on August 23, 2022, adjusting the settlement primarily for 2020 actual depreciation expense. The final order approved an increase of $7.2 million annually with an effective date of September 1, 2022.

On March 24, 2022, Cascade filed a request for a tariff revision with the WUTC to rectify an inadvertent IRS normalization violation resulting from its tariff established in 2018 that passes back to customers the reversal of plant-related excess deferred income taxes through an annual rate adjustment. This request was made in response to the issuance of an IRS private letter ruling to another Washington utility with the same annual rate adjustment tariff, which addressed its normalization violation. The private letter ruling concluded the tariff to refund excess deferred income taxes without corresponding adjustments for other components of rate base or changes in depreciation or income tax expense, is an impermissible methodology under the IRS normalization and consistency rules. Cascade's request proposes a similar remedy through the tariff to recover the excess amounts refunded to customers while this tariff has been in place, and revises the method going forward to reflect excess deferred income taxes in rates in the same manner as other components of rate base from its most recent general rate case. Cascade has requested recovery of the excess refunded to customers of approximately $3.3 million and elimination of the currently deferred, but not yet refunded balance. A multi-party settlement was filed with the WUTC on October 21, 2022. This matter is pending before the WUTC.

On October 14, 2022, Cascade filed an update to its annual pipeline cost recovery mechanism requesting an increase in annual revenue of approximately $1.2 million or approximately 0.4 percent. The filing was effective November 1, 2022.

FERC

On September 1, 2022, Montana-Dakota filed an update to its transmission formula rate under the MISO tariff for its multi-value project and network upgrade charges for $15.4 million, which is effective January 1, 2023.

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Contingencies

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Contingencies

Contingencies

The Company is party to claims and lawsuits arising out of its business and that of its consolidated subsidiaries, which may include, but are not limited to, matters involving property damage, personal injury, and environmental, contractual, statutory and regulatory obligations. The Company accrues a liability for those contingencies when the incurrence of a loss is probable and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The Company does not accrue liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is probable or reasonably possible and which are material, the Company discloses the nature of the contingency and, in some circumstances, an estimate of the possible loss. Accruals are based on the best information available, but in certain situations management is unable to estimate an amount or range of a reasonably possible loss including, but not limited to when: (1) the damages are unsubstantiated or indeterminate, (2) the proceedings are in the early stages, (3) numerous parties are involved, or (4) the matter involves novel or unsettled legal theories.

At September 30, 2022 and 2021, and December 31, 2021, the Company accrued contingent liabilities, which have not been discounted, of $33.6 million, $34.7 million and $37.0 million, respectively. At September 30, 2022 and 2021, and December 31, 2021, the Company also recorded corresponding insurance receivables of $11.9 million, $11.7 million and $14.1 million, respectively, and regulatory assets of $20.5 million, $21.1 million and $21.2 million, respectively, related to the accrued liabilities. The accruals are for contingencies resulting from litigation, production taxes, royalty claims and environmental matters. This includes amounts that have been accrued for matters discussed in Environmental matters within this note. The Company will continue to monitor each matter and adjust accruals as might be warranted based on new information and further developments. Management believes that the outcomes with respect to probable and reasonably possible losses in excess of the amounts accrued, net of insurance recoveries, while uncertain, either cannot be estimated or will not have a material effect upon the Company's financial position, results of operations or cash flows. Unless otherwise required by GAAP, legal costs are expensed as they are incurred.

Environmental matters

The Company is a party to claims for the cleanup of environmental contamination at certain manufactured gas plant sites, as well as a superfund site. There were no material changes to the Company's environmental matters that were previously reported in the 2021 Annual Report.

Guarantees

Certain subsidiaries of the Company have outstanding guarantees to third parties that guarantee the performance of other subsidiaries of the Company. These guarantees are related to construction contracts, insurance deductibles and loss limits, and certain other guarantees. At September 30, 2022, the fixed maximum amounts guaranteed under these agreements aggregate $333.7 million. Certain of the guarantees also have no fixed maximum amounts specified. At September 30, 2022, the amounts of scheduled expiration of the maximum amounts guaranteed under these agreements aggregate to $10.8 million in 2022; $68.6 million in 2023; $110.6 million in 2024; $130.5 million in 2025; $1.3 million in 2026; $700,000 thereafter; and $11.2 million, which has no scheduled maturity date. There were no amounts outstanding under the previously mentioned guarantees at September 30, 2022. In the event of default under these guarantee obligations, the subsidiary issuing the guarantee for that particular obligation would be required to make payments under its guarantee.

Certain subsidiaries have outstanding letters of credit to third parties related to insurance policies and other agreements, some of which are guaranteed by other subsidiaries of the Company. At September 30, 2022, the fixed maximum amounts guaranteed under these letters of credit aggregated $25.0 million. At September 30, 2022, the amounts of scheduled expiration of the maximum amounts guaranteed under these letters of credit aggregate to $21.8 million in 2022, $2.7 million in 2023 and $500,000 in 2024. There were no amounts outstanding under the previously mentioned letters of credit at September 30, 2022. In the event of default under these letter of credit obligations, the subsidiary guaranteeing the letter of credit would be obligated for reimbursement of payments made under the letter of credit.

In addition, Centennial, Knife River and MDU Construction Services have issued guarantees to third parties related to the routine purchase of maintenance items, materials and lease obligations for which no fixed maximum amounts have been specified. These guarantees have no scheduled maturity date. In the event a subsidiary of the Company defaults under these obligations, Centennial, Knife River or MDU Construction Services would be required to make payments under these guarantees. Any amounts outstanding by subsidiaries of the Company were reflected on the Consolidated Balance Sheet at September 30, 2022.

In the normal course of business, Centennial has surety bonds related to construction contracts and reclamation obligations of its subsidiaries. In the event a subsidiary of Centennial does not fulfill a bonded obligation, Centennial would be responsible to the surety bond company for completion of the bonded contract or obligation. A large portion of the surety bonds is expected to expire within the next 12 months; however, Centennial will likely continue to enter into surety bonds for its subsidiaries in the future. At September 30, 2022, approximately $932.4 million of surety bonds were outstanding, which were not reflected on the Consolidated Balance Sheet.

Variable interest entities

The Company evaluates its arrangements and contracts with other entities to determine if they are VIEs and if so, if the Company is the primary beneficiary.

Fuel Contract Coyote Station entered into a coal supply agreement with Coyote Creek that provides for the purchase of coal necessary to supply the coal requirements of the Coyote Station for the period May 2016 through December 2040. Coal purchased under the coal supply agreement is reflected in inventories on the Consolidated Balance Sheets and is recovered from customers as a component of electric fuel and purchased power.

The coal supply agreement creates a variable interest in Coyote Creek due to the transfer of all operating and economic risk to the Coyote Station owners, as the agreement is structured so that the price of the coal will cover all costs of operations, as well as future reclamation costs. The Coyote Station owners are also providing a guarantee of the value of the assets of Coyote Creek as they would be required to buy the assets at book value should they terminate the contract prior to the end of the contract term and are providing a guarantee of the value of the equity of Coyote Creek in that they are required to buy the entity at the end of the contract term at equity value. Although the Company has determined that Coyote Creek is a VIE, the Company has concluded that it is not the primary beneficiary of Coyote Creek because the authority to direct the activities of the entity is shared by the four unrelated owners of the Coyote Station, with no primary beneficiary existing. As a result, Coyote Creek is not required to be consolidated in the Company's financial statements.

At September 30, 2022, the Company's exposure to loss as a result of the Company's involvement with the VIE, based on the Company's ownership percentage, was $30.0 million.

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Basis of presentation (Policies)	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	The accompanying consolidated interim financial statements were prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Interim financial statements do not include all disclosures provided in annual financial statements and, accordingly, these financial statements should be read in conjunction with those appearing in the 2021 Annual Report. The information is unaudited but includes all adjustments that are, in the opinion of management, necessary for a fair presentation of the accompanying consolidated interim financial statements and are of a normal recurring nature. Depreciation, depletion and amortization expense is reported separately on the Consolidated Statements of Income and therefore is excluded from the other line items within operating expenses.

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New accounting standards (Policies)

9 Months Ended

Sep. 30, 2022

Accounting Standards Update and Change in Accounting Principle [Abstract]

New accounting standards

The following table provides a brief description of the accounting pronouncements applicable to the Company and the potential impact on its Consolidated Financial Statements and/or disclosures:

Standard	Description	Effective date	Impact on financial statements/disclosures
ASU 2021-10 - Government Assistance	In November 2021, the FASB issued guidance on modifying the disclosure requirements to increase the transparency of government assistance including disclosure of the types of assistance, an entity's accounting for the assistance and the effect of the assistance on an entity's financial statements.	January 1, 2022	The Company is currently evaluating the impact the guidance will have on its disclosures for the year ended December 31, 2022.
ASU 2020-04 - Reference Rate Reform	In March 2020, the FASB issued optional guidance to ease the facilitation of the effects of reference rate reform on financial reporting. The guidance applies to certain contract modifications, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Beginning January 1, 2022, LIBOR or other discontinued reference rates cannot be applied to new contracts. New contracts will incorporate a new reference rate, which includes SOFR. LIBOR or other discontinued reference rates cannot be applied to contract modifications or hedging relationships entered into or evaluated after December 31, 2022. Existing contracts referencing LIBOR or other reference rates expected to be discontinued must identify a replacement rate by June 30, 2023.	Effective as of March 12, 2020 and will continue through December 31, 2022	The Company has updated its credit agreements to include language regarding the successor or alternate rate to LIBOR, and a review of other contracts and agreements is on-going. The Company does not expect the guidance to have a material impact on its results of operations, financial position, cash flows or disclosures.

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Receivables and allowance for expected credit losses (Policies)	9 Months Ended
	Sep. 30, 2022
Credit Loss [Abstract]
Accounts receivable and allowance for doubtful accounts	Receivables consists primarily of trade receivables from the sale of goods and services, which are recorded at the invoiced amount, and contract assets, net of expected credit losses. For more information on contract assets, see Note 9. The Company's trade receivables are all due in 12 months or less.
Expected credit loss	The Company's expected credit losses are determined through a review using historical credit loss experience; changes in asset specific characteristics; current conditions; and reasonable and supportable future forecasts, among other specific account data, and is performed at least quarterly. The Company develops and documents its methodology to determine its allowance for expected credit losses at each of its reportable business segments. Risk characteristics used by the business segments may include customer mix, knowledge of customers and general economic conditions of the various local economies, among others. Specific account balances are written off when management determines the amounts to be uncollectible.

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Inventories and natural gas in storage (Policies)	9 Months Ended
	Sep. 30, 2022
Inventory Disclosure [Abstract]
Inventories and natural gas in storage	Natural gas in storage for the Company's regulated operations is generally valued at lower of cost or market using the last-in, first-out method or lower of cost or net realizable value using the average cost or first-in, first-out method. The majority of all other inventories are valued at the lower of cost or net realizable value using the average cost method.

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Earnings per share (Policies)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings per share	Basic earnings per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the applicable period. Diluted earnings per share is computed by dividing net income by the total of the weighted average number of shares of common stock outstanding during the applicable period, plus the effect of non-vested performance share awards and restricted stock units. Common stock outstanding includes issued shares less shares held in treasury.

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Revenue from contracts with customers (Policies)	9 Months Ended
	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from contracts with customers	Revenue is recognized when a performance obligation is satisfied by transferring control over a product or service to a customer. Revenue is measured based on consideration specified in a contract with a customer and excludes any sales incentives and amounts collected on behalf of third parties. The Company is considered an agent for certain taxes collected from customers. As such, the Company presents revenues net of these taxes at the time of sale to be remitted to governmental authorities, including sales and use taxes.

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Business Combinations (Policies)	9 Months Ended
	Sep. 30, 2022
Business Combinations [Abstract]
Business Combinations Policy	The following acquisitions were accounted for as business combinations in accordance with ASC 805 - Business Combinations. The results of the acquired businesses have been included in the Consolidated Financial Statements beginning on the acquisition date. Pro forma financial amounts reflecting the effects of the business combinations are not presented, as none of these business combinations, individually or in the aggregate, were material to the Company's financial position or results of operations.

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Fair value disclosures (Policies)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair value measurements	The Company measures its investments in certain fixed-income and equity securities at fair value with changes in fair value recognized in income.
Investments	The Company did not elect the fair value option, which records gains and losses in income, for its available-for-sale securities, which include mortgage-backed securities and U.S. Treasury securities. These available-for-sale securities are recorded at fair value and are classified as investments on the Consolidated Balance Sheets.

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Business segment data (Policies)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Business segment data	The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer.

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Contingencies (Policies)	9 Months Ended
	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Contingencies	The Company is party to claims and lawsuits arising out of its business and that of its consolidated subsidiaries, which may include, but are not limited to, matters involving property damage, personal injury, and environmental, contractual, statutory and regulatory obligations. The Company accrues a liability for those contingencies when the incurrence of a loss is probable and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The Company does not accrue liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is probable or reasonably possible and which are material, the Company discloses the nature of the contingency and, in some circumstances, an estimate of the possible loss. Accruals are based on the best information available, but in certain situations management is unable to estimate an amount or range of a reasonably possible loss including, but not limited to when: (1) the damages are unsubstantiated or indeterminate, (2) the proceedings are in the early stages, (3) numerous parties are involved, or (4) the matter involves novel or unsettled legal theories.
Variable interest entity	The Company evaluates its arrangements and contracts with other entities to determine if they are VIEs and if so, if the Company is the primary beneficiary.

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Receivables and allowance for expected credit losses (Tables)

9 Months Ended

Sep. 30, 2022

Credit Loss [Abstract]

Accounts Receivable, Allowance for Credit Loss

Details of the Company's expected credit losses were as follows:

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2021	$	269	$	1,506	$	2	$	5,406	$	2,533	$	9,716
Current expected credit loss provision	565		1,369		—		(253)		54		1,735
Less write-offs charged against the allowance	597		932		—		27		71		1,627
Credit loss recoveries collected	124		180		—		—		28		332
At March 31, 2022	$	361	$	2,123	$	2	$	5,126	$	2,544	$	10,156
Current expected credit loss provision	113		92		—		12		292		509
Less write-offs charged against the allowance	234		939		—		108		104		1,385
Credit loss recoveries collected	108		177		—		—		—		285
At June 30, 2022	$	348	$	1,453	$	2	$	5,030	$	2,732	$	9,565
Current expected credit loss provision	300		881		—		(55)		(111)		1,015
Less write-offs charged against the allowance	399		1,822		—		75		152		2,448
Credit loss recoveries collected	85		169		—		—		40		294
At September 30, 2022	$	334	$	681	$	2	$	4,900	$	2,509	$	8,426

	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Total
	(In thousands)
At December 31, 2020	$	899	$	2,571	$	2	$	6,164	$	5,722	$	15,358
Current expected credit loss provision	538		1,273		—		(1,049)		(1,079)		(317)
Less write-offs charged against the allowance	888		1,107		—		273		401		2,669
Credit loss recoveries collected	129		213		—		—		—		342
At March 31, 2021	$	678	$	2,950	$	2	$	4,842	$	4,242	$	12,714
Current expected credit loss provision	(110)		(103)		—		11		(639)		(841)
Less write-offs charged against the allowance	341		787		—		232		64		1,424
Credit loss recoveries collected	100		199		—		—		—		299
At June 30, 2021	$	327	$	2,259	$	2	$	4,621	$	3,539	$	10,748
Current expected credit loss provision	388		411		—		233		(675)		357
Less write-offs charged against the allowance	525		1,178		—		184		265		2,152
Credit loss recoveries collected	92		168		—		—		93		353
At September 30, 2021	$	282	$	1,660	$	2	$	4,670	$	2,692	$	9,306

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Inventories and natural gas in storage (Tables)

9 Months Ended

Sep. 30, 2022

Inventory Disclosure [Abstract]

Inventories

Inventories on the Consolidated Balance Sheets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Aggregates held for resale	$	198,711	$	183,693	$	184,363
Asphalt oil	56,609		32,964		57,002
Natural gas in storage (current)	48,532		28,683		18,867
Materials and supplies	42,359		27,253		30,629
Merchandise for resale	39,198		26,639		28,501
Other	13,233		13,053		16,247
Total	$	398,642	$	312,285	$	335,609

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Earnings per share (Tables)

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Weighted average common shares outstanding

A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands, except per share amounts)
Weighted average common shares outstanding - basic	203,351		202,863		203,351		201,647
Effect of dilutive performance share awards and restricted stock units	293		327		56		308
Weighted average common shares outstanding - diluted	203,644		203,190		203,407		201,955
Shares excluded from the calculation of diluted earnings per share	—		—		77		—
Dividends declared per common share	$	.2175	$	.2125	$	.6525	$	.6375

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Equity (Tables)

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Schedule of Stock by Class

Details of the Company's "at-the-market" offering activity was as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2022		2021			2022		2021
	(In millions)
Shares issued	—		1.0			—		2.8
Net proceeds *	$	—	$	34.2	**	$	(.1)	$	88.8	**

*    Net proceeds include issuance costs of $— and $149,000 for the three and nine months ended September 30, 2022, respectively, and $425,000 and $1.2 million for the three and nine months ended September 30, 2021, respectively.

**    Net proceeds were used for capital expenditures.

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Accumulated other comprehensive loss (Tables)

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Accumulated comprehensive loss

The after-tax changes in the components of accumulated other comprehensive loss were as follows:

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2021	$	(538)	$	(40,461)	$	(5)	$	(41,004)
Other comprehensive loss before reclassifications	—		—		(320)		(320)
Amounts reclassified from accumulated other comprehensive loss	112		445		32		589
Net current-period other comprehensive income (loss)	112		445		(288)		269
At March 31, 2022	$	(426)	$	(40,016)	$	(293)	$	(40,735)
Other comprehensive loss before reclassifications	—		—		(128)		(128)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset	—		(3,265)		—		(3,265)
Amounts reclassified from accumulated other comprehensive loss	111		461		25		597
Net current-period other comprehensive income (loss)	111		(2,804)		(103)		(2,796)
At June 30, 2022	$	(315)	$	(42,820)	$	(396)	$	(43,531)
Other comprehensive loss before reclassifications	—		—		(329)		(329)
Amounts reclassified from accumulated other comprehensive loss	111		461		42		614
Net current-period other comprehensive income (loss)	111		461		(287)		285
At September 30, 2022	$	(204)	$	(42,359)	$	(683)	$	(43,246)

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  Liability Adjustment		Net Unrealized Gain (Loss) on Available-for-sale Investments		Total Accumulated  Other Comprehensive  Loss
	(In thousands)
At December 31, 2020	$	(984)	$	(47,207)	$	113	$	(48,078)
Other comprehensive loss before reclassifications	—		—		(44)		(44)
Amounts reclassified from accumulated other comprehensive loss	111		466		35		612
Net current-period other comprehensive income (loss)	111		466		(9)		568
At March 31, 2021	$	(873)	$	(46,741)	$	104	$	(47,510)
Other comprehensive loss before reclassifications	—		—		(52)		(52)
Amounts reclassified from accumulated other comprehensive loss	112		457		25		594
Net current-period other comprehensive income (loss)	112		457		(27)		542
At June 30, 2021	$	(761)	$	(46,284)	$	77	$	(46,968)
Other comprehensive loss before reclassifications	—		—		(54)		(54)
Amounts reclassified from accumulated other comprehensive loss	111		466		20		597
Net current-period other comprehensive income (loss)	111		466		(34)		543
At September 30, 2021	$	(650)	$	(45,818)	$	43	$	(46,425)

Reclassification out of accumulated other comprehensive loss

The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended				Nine Months Ended				Location on Consolidated Statements of Income
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	(148)	$	(147)	$	(443)	$	(443)	Interest expense
	37		36		109		109		Income taxes
	(111)		(111)		(334)		(334)
Amortization of postretirement liability losses included in net periodic benefit credit	(609)		(617)		(1,827)		(1,851)		Other income
	148		151		460		462		Income taxes
	(461)		(466)		(1,367)		(1,389)
Reclassification adjustment on available-for-sale investments included in net income	(54)		(26)		(126)		(101)		Other income
	12		6		27		21		Income taxes
	(42)		(20)		(99)		(80)
Total reclassifications	$	(614)	$	(597)	$	(1,800)	$	(1,803)

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Revenue from contracts with customers (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

In the following tables, revenue is disaggregated by the type of customer or service provided. The Company believes this level of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The table also includes a reconciliation of the disaggregated revenue by reportable segments. For more information on the Company's business segments, see Note 17.

Three Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,981	$	64,074	$	—	$	—	$	—	$	—	$	101,055
Commercial utility sales	38,785		43,734		—		—		—		—		82,519
Industrial utility sales	10,838		7,209		—		—		—		—		18,047
Other utility sales	2,002		—		—		—		—		—		2,002
Natural gas transportation	—		11,910		32,144		—		—		—		44,054
Natural gas storage	—		—		3,595		—		—		—		3,595
Contracting services	—		—		—		492,207		—		—		492,207
Construction materials	—		—		—		742,982		—		—		742,982
Intrasegment eliminations	—		—		—		(259,761)		—		—		(259,761)
Electrical & mechanical specialty contracting	—		—		—		—		543,717		—		543,717
Transmission & distribution specialty contracting	—		—		—		—		181,550		—		181,550
Other	10,758		3,494		3,815		—		200		4,438		22,705
Intersegment eliminations	(124)		(139)		(3,595)		(343)		(2,229)		(4,438)		(10,868)
Revenues from contracts with customers	99,240		130,282		35,959		975,085		723,238		—		1,963,804
Other revenues	(47)		1,792		86		—		11,571		—		13,402
Total external operating revenues	$	99,193	$	132,074	$	36,045	$	975,085	$	734,809	$	—	$	1,977,206

Three Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	36,412	$	55,284	$	—	$	—	$	—	$	—	$	91,696
Commercial utility sales	39,033		35,338		—		—		—		—		74,371
Industrial utility sales	10,495		5,395		—		—		—		—		15,890
Other utility sales	1,993		—		—		—		—		—		1,993
Natural gas transportation	—		11,812		28,058		—		—		—		39,870
Natural gas storage	—		—		3,483		—		—		—		3,483
Contracting services	—		—		—		415,106		—		—		415,106
Construction materials	—		—		—		617,823		—		—		617,823
Intrasegment eliminations	—		—		—		(201,630)		—		—		(201,630)
Electrical & mechanical specialty contracting	—		—		—		—		317,238		—		317,238
Transmission & distribution specialty contracting	—		—		—		—		185,842		—		185,842
Other	12,589		2,110		3,290		—		75		3,423		21,487
Intersegment eliminations	(136)		(142)		(3,908)		(110)		(289)		(3,398)		(7,983)
Revenues from contracts with customers	100,386		109,797		30,923		831,189		502,866		25		1,575,186
Other revenues	(1,456)		581		45		—		11,657		—		10,827
Total external operating revenues	$	98,930	$	110,378	$	30,968	$	831,189	$	514,523	$	25	$	1,586,013

Nine Months Ended September 30, 2022	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	103,648	$	439,639	$	—	$	—	$	—	$	—	$	543,287
Commercial utility sales	108,400		279,697		—		—		—		—		388,097
Industrial utility sales	32,067		29,242		—		—		—		—		61,309
Other utility sales	5,632		—		—		—		—		—		5,632
Natural gas transportation	—		35,747		95,685		—		—		—		131,432
Natural gas storage	—		—		10,210		—		—		—		10,210
Contracting services	—		—		—		937,156		—		—		937,156
Construction materials	—		—		—		1,535,077		—		—		1,535,077
Intrasegment eliminations	—		—		—		(475,026)		—		—		(475,026)
Electrical & mechanical specialty contracting	—		—		—		—		1,443,758		—		1,443,758
Transmission & distribution specialty contracting	—		—		—		—		496,190		—		496,190
Other	33,727		9,854		8,200		—		357		13,168		65,306
Intersegment eliminations	(371)		(416)		(37,328)		(674)		(5,090)		(13,168)		(57,047)
Revenues from contracts with customers	283,103		793,763		76,767		1,996,533		1,935,215		—		5,085,381
Other revenues	(4,854)		(831)		210		—		34,780		—		29,305
Total external operating revenues	$	278,249	$	792,932	$	76,977	$	1,996,533	$	1,969,995	$	—	$	5,114,686

Nine Months Ended September 30, 2021	Electric		Natural gas distribution		Pipeline		Construction materials and contracting		Construction services		Other		Total
	(In thousands)
Residential utility sales	$	99,106	$	341,901	$	—	$	—	$	—	$	—	$	441,007
Commercial utility sales	105,795		203,002		—		—		—		—		308,797
Industrial utility sales	30,878		20,387		—		—		—		—		51,265
Other utility sales	5,384		—		—		—		—		—		5,384
Natural gas transportation	—		35,715		85,160		—		—		—		120,875
Natural gas storage	—		—		10,606		—		—		—		10,606
Contracting services	—		—		—		791,964		—		—		791,964
Construction materials	—		—		—		1,332,997		—		—		1,332,997
Intrasegment eliminations	—		—		—		(394,126)		—		—		(394,126)
Electrical & mechanical specialty contracting	—		—		—		—		1,020,130		—		1,020,130
Transmission & distribution specialty contracting	—		—		—		—		502,328		—		502,328
Other	31,827		7,913		10,760		—		168		10,152		60,820
Intersegment eliminations	(407)		(425)		(38,000)		(314)		(2,128)		(10,082)		(51,356)
Revenues from contracts with customers	272,583		608,493		68,526		1,730,521		1,520,498		70		4,200,691
Other revenues	(5,329)		5,880		127		—		36,239		—		36,917
Total external operating revenues	$	267,254	$	614,373	$	68,653	$	1,730,521	$	1,556,737	$	70	$	4,237,608

Contract balances

The changes in contract assets and liabilities were as follows:

	September 30, 2022		December 31, 2021		Change		Location on Consolidated Balance Sheets
	(In thousands)
Contract assets	$	265,585	$	125,742	$	139,843	Receivables, net
Contract liabilities - current	(216,439)		(179,140)		(37,299)		Accounts payable
Contract liabilities - noncurrent	(12)		(118)		106		Noncurrent liabilities - other
Net contract assets (liabilities)	$	49,134	$	(53,516)	$	102,650

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Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill

The changes in the carrying amount of goodwill were as follows:

	Balance at January 1, 2022		Goodwill Acquired During  the Year		Measurement Period Adjustments		Balance at September 30, 2022
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	276,426		—		(2,124)		274,302
Construction services	143,224		—		—		143,224
Total	$	765,386	$	—	$	(2,124)	$	763,262

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		2,900		(217)		228,686
Construction services	143,224		—		—		143,224
Total	$	714,963	$	2,900	$	(217)	$	717,646

	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		50,640		(217)		276,426
Construction services	143,224		—		—		143,224
Total	$	714,963	$	50,640	$	(217)	$	765,386

Other amortizable intangible assets

Other amortizable intangible assets were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Customer relationships	$	28,990	$	29,423	$	29,740
Less accumulated amortization	12,768		9,705		10,650
	16,222		19,718		19,090
Noncompete agreements	4,591		3,991		4,591
Less accumulated amortization	3,377		2,710		2,856
	1,214		1,281		1,735
Other	5,279		11,957		12,601
Less accumulated amortization	3,970		10,715		10,848
	1,309		1,242		1,753
Total	$	18,745	$	22,241	$	22,578

Estimated amortization expense

Estimated amortization expense for identifiable intangible assets as of September 30, 2022, was:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Amortization expense	$	1,159	$	4,591	$	4,249	$	2,200	$	1,781	$	4,765

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Regulatory assets and liabilities (Tables)

9 Months Ended

Sep. 30, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets

The following table summarizes the individual components of unamortized regulatory assets and liabilities:

	Estimated Recovery or Refund Period as of September 30, 2022	*	September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Regulatory assets:
Current:
Natural gas costs recoverable through rate adjustments	Up to 1 year		$	112,079	$	98,211	$	86,371
Conservation programs	Up to 1 year		9,363		8,495		8,225
Decoupling	Up to 1 year		6,549		7,195		9,131
Cost recovery mechanisms	Up to 1 year		3,354		4,693		4,536
Other	Up to 1 year		16,815		14,541		10,428
			148,160		133,135		118,691
Noncurrent:
Pension and postretirement benefits	**		137,582		155,888		142,681
Cost recovery mechanisms	Up to 10 years		67,094		43,955		44,870
Plant costs/asset retirement obligations	Over plant lives		61,941		73,528		63,116
Plant to be retired	-		24,740		48,544		50,070
Manufactured gas plant site remediation	-		25,963		26,000		26,053
Taxes recoverable from customers	Over plant lives		12,394		11,438		12,339
Long-term debt refinancing costs	Up to 38 years		3,335		3,952		3,794
Natural gas costs recoverable through rate adjustments	Up to 2 years		462		6,084		5,186
Other	Up to 17 years		10,931		9,856		9,742
			344,442		379,245		357,851
Total regulatory assets			$	492,602	$	512,380	$	476,542
Regulatory liabilities:
Current:
Taxes refundable to customers	Up to 1 year		$	4,264	$	3,867	$	3,841
Electric fuel and purchased power deferral	Up to 1 year		3,763		3,205		—
Cost recovery mechanisms	Up to 1 year		2,674		2,797		214
Natural gas costs refundable through rate adjustments	Up to 1 year		873		—		6,700
Other	Up to 1 year		7,025		6,622		5,548
			18,599		16,491		16,303
Noncurrent:
Taxes refundable to customers	Over plant lives		205,517		218,566		215,421
Plant removal and decommissioning costs	Over plant lives		174,481		172,683		168,152
Pension and postretirement benefits	**		19,687		16,915		20,434
Accumulated deferred investment tax credit	Up to 20 years		14,665		12,403		12,696
Cost recovery mechanisms	Up to 20 years		12,535		—		7,727
Other	Up to 16 years		6,327		5,574		4,360
			433,212		426,141		428,790
Total regulatory liabilities			$	451,811	$	442,632	$	445,093
Net regulatory position			$	40,791	$	69,748	$	31,449

*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers.

**    Recovered as expense is incurred or cash contributions are made.

Regulatory Liabilities

The following table summarizes the individual components of unamortized regulatory assets and liabilities:

	Estimated Recovery or Refund Period as of September 30, 2022	*	September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Regulatory assets:
Current:
Natural gas costs recoverable through rate adjustments	Up to 1 year		$	112,079	$	98,211	$	86,371
Conservation programs	Up to 1 year		9,363		8,495		8,225
Decoupling	Up to 1 year		6,549		7,195		9,131
Cost recovery mechanisms	Up to 1 year		3,354		4,693		4,536
Other	Up to 1 year		16,815		14,541		10,428
			148,160		133,135		118,691
Noncurrent:
Pension and postretirement benefits	**		137,582		155,888		142,681
Cost recovery mechanisms	Up to 10 years		67,094		43,955		44,870
Plant costs/asset retirement obligations	Over plant lives		61,941		73,528		63,116
Plant to be retired	-		24,740		48,544		50,070
Manufactured gas plant site remediation	-		25,963		26,000		26,053
Taxes recoverable from customers	Over plant lives		12,394		11,438		12,339
Long-term debt refinancing costs	Up to 38 years		3,335		3,952		3,794
Natural gas costs recoverable through rate adjustments	Up to 2 years		462		6,084		5,186
Other	Up to 17 years		10,931		9,856		9,742
			344,442		379,245		357,851
Total regulatory assets			$	492,602	$	512,380	$	476,542
Regulatory liabilities:
Current:
Taxes refundable to customers	Up to 1 year		$	4,264	$	3,867	$	3,841
Electric fuel and purchased power deferral	Up to 1 year		3,763		3,205		—
Cost recovery mechanisms	Up to 1 year		2,674		2,797		214
Natural gas costs refundable through rate adjustments	Up to 1 year		873		—		6,700
Other	Up to 1 year		7,025		6,622		5,548
			18,599		16,491		16,303
Noncurrent:
Taxes refundable to customers	Over plant lives		205,517		218,566		215,421
Plant removal and decommissioning costs	Over plant lives		174,481		172,683		168,152
Pension and postretirement benefits	**		19,687		16,915		20,434
Accumulated deferred investment tax credit	Up to 20 years		14,665		12,403		12,696
Cost recovery mechanisms	Up to 20 years		12,535		—		7,727
Other	Up to 16 years		6,327		5,574		4,360
			433,212		426,141		428,790
Total regulatory liabilities			$	451,811	$	442,632	$	445,093
Net regulatory position			$	40,791	$	69,748	$	31,449

*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers.

**    Recovered as expense is incurred or cash contributions are made.

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Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Available-for-sale securities

Details of available-for-sale securities were as follows:

September 30, 2022	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,486	$	—	$	783	$	7,703
U.S. Treasury securities	2,468		—		82		2,386
Total	$	10,954	$	—	$	865	$	10,089

September 30, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,597	$	93	$	11	$	8,679
U.S. Treasury securities	2,681		—		28		2,653
Total	$	11,278	$	93	$	39	$	11,332

December 31, 2021	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Mortgage-backed securities	$	8,702	$	51	$	47	$	8,706
U.S. Treasury securities	2,407		—		11		2,396
Total	$	11,109	$	51	$	58	$	11,102

Assets and liabilities measured at fair value on a recurring basis

The Company's assets measured at fair value on a recurring basis were as follows:

	Fair Value Measurements at September 30, 2022, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2022
	(In thousands)
Assets:
Money market funds	$	—	$	7,309	$	—	$	7,309
Insurance contracts*	—		95,170		—		95,170
Available-for-sale securities:
Mortgage-backed securities	—		7,703		—		7,703
U.S. Treasury securities	—		2,386		—		2,386
Total assets measured at fair value	$	—	$	112,568	$	—	$	112,568

*    The insurance contracts invest approximately 65 percent in fixed-income investments, 14 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.

	Fair Value Measurements at September 30, 2021, Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	9,907	$	—	$	9,907
Insurance contracts*	—		106,371		—		106,371
Available-for-sale securities:
Mortgage-backed securities	—		8,679		—		8,679
U.S. Treasury securities	—		2,653		—		2,653
Total assets measured at fair value	$	—	$	127,610	$	—	$	127,610

*    The insurance contracts invest approximately 63 percent in fixed-income investments, 16 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 1 percent in cash equivalents.

	Fair Value Measurements at December 31, 2021, Using
	Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Balance at December 31, 2021
	(In thousands)
Assets:
Money market funds	$	—	$	10,190	$	—	$	10,190
Insurance contracts*	—		109,603		—		109,603
Available-for-sale securities:
Mortgage-backed securities	—		8,706		—		8,706
U.S. Treasury securities	—		2,396		—		2,396
Total assets measured at fair value	$	—	$	130,895	$	—	$	130,895

*    The insurance contracts invest approximately 61 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.

Fair value of long term debt outstanding

The estimated fair value of the Company's Level 2 long-term debt was as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Carrying amount	$	2,988,452	$	2,328,266	$	2,741,900
Fair value	$	2,647,387	$	2,599,907	$	2,984,866

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Debt (Tables)

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Long-term debt outstanding

Long-term debt outstanding was as follows:

	Weighted Average Interest Rate at September 30, 2022		September 30, 2022		September 30, 2021		December 31, 2021
			(In thousands)
Senior Notes due on dates ranging from October 22, 2022 to June 15, 2062	4.29	%	$	2,365,000	$	2,025,000	$	2,125,000
Commercial paper supported by revolving credit agreements	3.66	%	460,600		168,800		450,300
Credit agreements due on June 7, 2024	4.55	%	125,580		94,300		127,500
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029	7.32	%	35,000		35,000		35,000
Term Loan Agreement due on September 3, 2032	3.64	%	7,000		7,700		7,700
Other notes due on dates ranging from January 1, 2024 to January 1, 2061	.97	%	2,349		3,198		2,564
Less unamortized debt issuance costs			6,633		5,709		6,090
Less discount			444		23		74
Total long-term debt			2,988,452		2,328,266		2,741,900
Less current maturities			214,453		1,548		148,053
Net long-term debt			$	2,773,999	$	2,326,718	$	2,593,847

Schedule of debt maturities

Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at September 30, 2022, were as follows:

	Remainder of 2022		2023		2024		2025		2026		Thereafter
	(In thousands)
Long-term debt maturities	$	147,253	$	77,923	$	646,983	$	177,802	$	140,802	$	1,804,766

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Cash flow information (Tables)

9 Months Ended

Sep. 30, 2022

Supplemental Cash Flow Information [Abstract]

Cash expenditures for interest and income taxes and noncash investing and financing transactions

Cash expenditures for interest and income taxes were as follows:

	Nine Months Ended
	September 30,
	2022		2021
	(In thousands)
Interest, net*	$	75,425	$	59,876
Income taxes paid, net	$	17,664	$	61,250

*    AFUDC - borrowed was $2.4 million and $1.6 million for the nine months ended September 30, 2022 and 2021, respectively.

Noncash investing and financing transactions were as follows:

	September 30, 2022		September 30, 2021		December 31, 2021
	(In thousands)
Right-of-use assets obtained in exchange for new operating lease liabilities	$	36,492	$	26,120	$	55,987
Property, plant and equipment additions in accounts payable	$	44,277	$	88,355	$	57,605
Debt assumed in connection with a business combination	$	—	$	—	$	10

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Business segment data (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Information on the Company's businesses

Information on the Company's segments was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
External operating revenues:
Regulated operations:
Electric	$	99,193	$	98,930	$	278,249	$	267,254
Natural gas distribution	132,074		110,378		792,932		614,373
Pipeline	32,347		27,757		69,347		58,390
	263,614		237,065		1,140,528		940,017

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Non-regulated operations:
Pipeline	3,698		3,211		7,630		10,263
Construction materials and contracting	975,085		831,189		1,996,533		1,730,521
Construction services	734,809		514,523		1,969,995		1,556,737
Other	—		25		—		70
	1,713,592		1,348,948		3,974,158		3,297,591
Total external operating revenues	$	1,977,206	$	1,586,013	$	5,114,686	$	4,237,608
Intersegment operating revenues:
Regulated operations:
Electric	$	124	$	136	$	371	$	407
Natural gas distribution	139		142		416		425
Pipeline	3,508		3,845		36,845		37,530
	3,771		4,123		37,632		38,362
Non-regulated operations:
Pipeline	87		63		483		470
Construction materials and contracting	343		110		674		314
Construction services	2,229		289		5,090		2,128
Other	4,438		3,398		13,168		10,082
	7,097		3,860		19,415		12,994
Intersegment eliminations	(10,868)		(7,983)		(57,047)		(51,356)
Total intersegment operating revenues	$	—	$	—	$	—	$	—
Operating income (loss):
Electric	$	30,395	$	27,310	$	53,764	$	53,982
Natural gas distribution	(16,688)		(14,249)		38,929		42,925
Pipeline	14,963		12,284		39,447		35,896
Construction materials and contracting	147,367		133,712		157,116		171,274
Construction services	34,949		30,120		110,588		108,172
Other	(1,135)		(8)		(2,081)		(226)
Total operating income	$	209,851	$	189,169	$	397,763	$	412,023
Net income (loss):
Regulated operations:
Electric	$	21,596	$	20,564	$	37,476	$	41,618
Natural gas distribution	(18,058)		(15,390)		10,758		20,081
Pipeline	9,379		10,225		24,527		27,508
	12,917		15,399		72,761		89,207
Non-regulated operations:
Pipeline	492		356		(187)		1,166
Construction materials and contracting	102,764		96,282		95,337		116,865
Construction services	27,977		23,130		83,755		81,839
Other	3,783		3,795		(1,368)		2,172
	135,016		123,563		177,537		202,042
Income from continuing operations	147,933		138,962		250,298		291,249
Discontinued operations, net of tax	38		314		103		348
Net income	$	147,971	$	139,276	$	250,401	$	291,597

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Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of net benefit costs

Components of net periodic benefit credit for the Company's pension benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,630	$	2,455	$	7,892	$	7,365
Expected return on assets	(4,864)		(4,894)		(14,592)		(14,682)
Amortization of net actuarial loss	1,670		2,004		5,012		6,012
Net periodic benefit credit	$	(564)	$	(435)	$	(1,688)	$	(1,305)

Components of net periodic benefit credit for the Company's other postretirement benefit plans were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400	$	1,062	$	1,200
Interest cost	474		466		1,422		1,398
Expected return on assets	(1,322)		(1,275)		(3,966)		(3,825)
Amortization of prior service credit	(350)		(349)		(1,050)		(1,047)
Amortization of net actuarial (gain) loss	(55)		6		(163)		18
Net periodic benefit credit, including amount capitalized	(899)		(752)		(2,695)		(2,256)
Less amount capitalized	48		46		132		129
Net periodic benefit credit	$	(947)	$	(798)	$	(2,827)	$	(2,385)

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Receivables and allowance for expected credit losses (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Credit Loss [Abstract]
Accounts Receivable, Noncurrent, 90 Days or More Past Due, Still Accruing	$ 41.5	$ 44.8	$ 37.9

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Receivables and allowance for expected credit losses (Details 2) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses							$ 3,258	$ (801)
Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	$ 9,565	$ 10,156	$ 9,716	$ 10,748	$ 12,714	$ 15,358	9,716	15,358
Provision for credit losses	1,015	509	1,735	357	(841)	(317)
Less write-offs charged against the allowance	2,448	1,385	1,627	2,152	1,424	2,669
Credit loss recoveries collected	294	285	332	353	299	342
Balance	8,426	9,565	10,156	9,306	10,748	12,714	8,426	9,306
Electric | Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	348	361	269	327	678	899	269	899
Provision for credit losses	300	113	565	388	(110)	538
Less write-offs charged against the allowance	399	234	597	525	341	888
Credit loss recoveries collected	85	108	124	92	100	129
Balance	334	348	361	282	327	678	334	282
Natural gas distribution | Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	1,453	2,123	1,506	2,259	2,950	2,571	1,506	2,571
Provision for credit losses	881	92	1,369	411	(103)	1,273
Less write-offs charged against the allowance	1,822	939	932	1,178	787	1,107
Credit loss recoveries collected	169	177	180	168	199	213
Balance	681	1,453	2,123	1,660	2,259	2,950	681	1,660
Pipeline | Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	2	2	2	2	2	2	2	2
Provision for credit losses	0	0	0	0	0	0
Less write-offs charged against the allowance	0	0	0	0	0	0
Credit loss recoveries collected	0	0	0	0	0	0
Balance	2	2	2	2	2	2	2	2
Construction materials and contracting | Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	5,030	5,126	5,406	4,621	4,842	6,164	5,406	6,164
Provision for credit losses	(55)	12	(253)	233	11	(1,049)
Less write-offs charged against the allowance	75	108	27	184	232	273
Credit loss recoveries collected	0	0	0	0	0	0
Balance	4,900	5,030	5,126	4,670	4,621	4,842	4,900	4,670
Construction services | Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance	2,732	2,544	2,533	3,539	4,242	5,722	2,533	5,722
Provision for credit losses	(111)	292	54	(675)	(639)	(1,079)
Less write-offs charged against the allowance	152	104	71	265	64	401
Credit loss recoveries collected	40	0	28	93	0	0
Balance	$ 2,509	$ 2,732	$ 2,544	$ 2,692	$ 3,539	$ 4,242	$ 2,509	$ 2,692

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Inventories and natural gas in storage (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Inventory Disclosure [Abstract]
Aggregates held for resale	$ 198,711	$ 184,363	$ 183,693
Asphalt oil	56,609	57,002	32,964
Natural gas in storage (current)	48,532	18,867	28,683
Materials and supplies	42,359	30,629	27,253
Merchandise for resale	39,198	28,501	26,639
Other	13,233	16,247	13,053
Total	398,642	335,609	312,285
Natural gas in storage noncurrent	$ 47,200	$ 47,500	$ 47,500

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Earnings per share (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Weighted average common shares outstanding - basic	203,351	202,863	203,351	201,647
Effect of dilutive performance share awards and restricted stock units	293	327	56	308
Weighted average common shares outstanding - diluted	203,644	203,190	203,407	201,955
Shares excluded from the calculation of diluted earnings per share	0	0	77	0
Dividends declared per common share	$ 0.2175	$ 0.2125	$ 0.6525	$ 0.6375

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Equity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Class of Stock [Line Items]
Common stock shares authorized under equity program	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000
Net proceeds *			$ (149,000)	$ 88,830,000
At-the-market offering
Class of Stock [Line Items]
Common stock shares authorized under equity program	6,400,000		6,400,000
Common stock shares reserved for future issuance	3,600,000		3,600,000
Shares issued	0	1,000,000.0	0	2,800,000
Net proceeds *	$ 0	$ 34,200,000	$ (100,000)	$ 88,800,000
Issuance costs	$ 0	$ 425,000	$ 149,000	$ 1,200,000

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Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated other comprehensive loss [Roll Forward]
Balance	$ 3,386,810	$ 3,360,718	$ 3,382,874	$ 3,198,802	$ 3,100,306	$ 3,079,105	$ 3,382,874	$ 3,079,105
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset	0			0			(3,265)	0
Other comprehensive income (loss)	285	(2,796)	269	543	542	568	(2,242)	1,653
Balance	3,491,858	3,386,810	3,360,718	3,332,278	3,198,802	3,100,306	3,491,858	3,332,278
Net unrealized gain (loss) on derivative instruments qualifying as hedges
Accumulated other comprehensive loss [Roll Forward]
Balance	(315)	(426)	(538)	(761)	(873)	(984)	(538)	(984)
Other comprehensive loss before reclassifications	0	0	0	0	0	0
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset		0
Amounts reclassified from accumulated other comprehensive loss	111	111	112	111	112	111
Other comprehensive income (loss)	111	111	112	111	112	111
Balance	(204)	(315)	(426)	(650)	(761)	(873)	(204)	(650)
Postretirement liability adjustment
Accumulated other comprehensive loss [Roll Forward]
Balance	(42,820)	(40,016)	(40,461)	(46,284)	(46,741)	(47,207)	(40,461)	(47,207)
Other comprehensive loss before reclassifications	0	0	0	0	0	0
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset		(3,265)
Amounts reclassified from accumulated other comprehensive loss	461	461	445	466	457	466
Other comprehensive income (loss)	461	(2,804)	445	466	457	466
Balance	(42,359)	(42,820)	(40,016)	(45,818)	(46,284)	(46,741)	(42,359)	(45,818)
Net unrealized gain (loss) on available-for-sale investments
Accumulated other comprehensive loss [Roll Forward]
Balance	(396)	(293)	(5)	77	104	113	(5)	113
Other comprehensive loss before reclassifications	(329)	(128)	(320)	(54)	(52)	(44)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset		0
Amounts reclassified from accumulated other comprehensive loss	42	25	32	20	25	35
Other comprehensive income (loss)	(287)	(103)	(288)	(34)	(27)	(9)
Balance	(683)	(396)	(293)	43	77	104	(683)	43
Total accumulated other comprehensive loss
Accumulated other comprehensive loss [Roll Forward]
Balance	(43,531)	(40,735)	(41,004)	(46,968)	(47,510)	(48,078)	(41,004)	(48,078)
Other comprehensive loss before reclassifications	(329)	(128)	(320)	(54)	(52)	(44)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset		(3,265)
Amounts reclassified from accumulated other comprehensive loss	614	597	589	597	594	612
Other comprehensive income (loss)	285	(2,796)	269	543	542	568
Balance	$ (43,246)	$ (43,531)	$ (40,735)	$ (46,425)	$ (46,968)	$ (47,510)	$ (43,246)	$ (46,425)

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Reclassification out of accumulated other comprehensive loss (Details 2) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]
Interest expense	$ (31,369)			$ (23,389)			$ (84,741)	$ (70,224)
Income taxes	(35,318)			(32,748)			(60,847)	(68,860)
Other income	4,769			5,930			(1,877)	18,310
Net income	147,971	$ 70,667	$ 31,763	139,276	$ 100,190	$ 52,131	250,401	291,597
Reclassification out of accumulated other comprehensive loss
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]
Net income	(614)			(597)			(1,800)	(1,803)
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive loss | Interest rate contract
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]
Interest expense	(148)			(147)			(443)	(443)
Income taxes	37			36			109	109
Net income	(111)			(111)			(334)	(334)
Amortization of postretirement liability losses included in net periodic benefit credit | Reclassification out of accumulated other comprehensive loss
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]
Income taxes	148			151			460	462
Other income	(609)			(617)			(1,827)	(1,851)
Net income	(461)			(466)			(1,367)	(1,389)
Reclassification adjustment on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive loss
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]
Income taxes	12			6			27	21
Other income	(54)			(26)			(126)	(101)
Net income	$ (42)			$ (20)			$ (99)	$ (80)

XML

Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Operating revenues:	$ 1,977,206	$ 1,586,013	$ 5,114,686	$ 4,237,608
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(10,868)	(7,983)	(57,047)	(51,356)
Intrasegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(259,761)	(201,630)	(475,026)	(394,126)
Natural gas transportation
Disaggregation of Revenue [Line Items]
Operating revenues:	44,054	39,870	131,432	120,875
Natural gas storage
Disaggregation of Revenue [Line Items]
Operating revenues:	3,595	3,483	10,210	10,606
Contracting services
Disaggregation of Revenue [Line Items]
Operating revenues:	492,207	415,106	937,156	791,964
Construction materials
Disaggregation of Revenue [Line Items]
Operating revenues:	742,982	617,823	1,535,077	1,332,997
Electrical & mechanical specialty contracting
Disaggregation of Revenue [Line Items]
Operating revenues:	543,717	317,238	1,443,758	1,020,130
Transmission & distribution specialty contracting
Disaggregation of Revenue [Line Items]
Operating revenues:	181,550	185,842	496,190	502,328
Other
Disaggregation of Revenue [Line Items]
Operating revenues:	22,705	21,487	65,306	60,820
Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	1,963,804	1,575,186	5,085,381	4,200,691
Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	13,402	10,827	29,305	36,917
Residential utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	101,055	91,696	543,287	441,007
Commercial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	82,519	74,371	388,097	308,797
Industrial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	18,047	15,890	61,309	51,265
Other utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	2,002	1,993	5,632	5,384
Electric
Disaggregation of Revenue [Line Items]
Operating revenues:	99,193	98,930	278,249	267,254
Electric | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(124)	(136)	(371)	(407)
Electric | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	10,758	12,589	33,727	31,827
Electric | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	99,240	100,386	283,103	272,583
Electric | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	(47)	(1,456)	(4,854)	(5,329)
Electric | Residential utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	36,981	36,412	103,648	99,106
Electric | Commercial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	38,785	39,033	108,400	105,795
Electric | Industrial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	10,838	10,495	32,067	30,878
Electric | Other utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	2,002	1,993	5,632	5,384
Natural gas distribution
Disaggregation of Revenue [Line Items]
Operating revenues:	132,074	110,378	792,932	614,373
Natural gas distribution | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(139)	(142)	(416)	(425)
Natural gas distribution | Natural gas transportation
Disaggregation of Revenue [Line Items]
Operating revenues:	11,910	11,812	35,747	35,715
Natural gas distribution | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	3,494	2,110	9,854	7,913
Natural gas distribution | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	130,282	109,797	793,763	608,493
Natural gas distribution | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	1,792	581	(831)	5,880
Natural gas distribution | Residential utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	64,074	55,284	439,639	341,901
Natural gas distribution | Commercial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	43,734	35,338	279,697	203,002
Natural gas distribution | Industrial utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	7,209	5,395	29,242	20,387
Natural gas distribution | Other utility sales
Disaggregation of Revenue [Line Items]
Operating revenues:	0	0	0	0
Pipeline
Disaggregation of Revenue [Line Items]
Operating revenues:	36,045	30,968	76,977	68,653
Pipeline | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(3,595)	(3,908)	(37,328)	(38,000)
Pipeline | Natural gas transportation
Disaggregation of Revenue [Line Items]
Operating revenues:	32,144	28,058	95,685	85,160
Pipeline | Natural gas storage
Disaggregation of Revenue [Line Items]
Operating revenues:	3,595	3,483	10,210	10,606
Pipeline | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	3,815	3,290	8,200	10,760
Pipeline | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	35,959	30,923	76,767	68,526
Pipeline | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	86	45	210	127
Construction materials and contracting
Disaggregation of Revenue [Line Items]
Operating revenues:	975,085	831,189	1,996,533	1,730,521
Construction materials and contracting | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(343)	(110)	(674)	(314)
Construction materials and contracting | Intrasegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(259,761)	(201,630)	(475,026)	(394,126)
Construction materials and contracting | Contracting services
Disaggregation of Revenue [Line Items]
Operating revenues:	492,207	415,106	937,156	791,964
Construction materials and contracting | Construction materials
Disaggregation of Revenue [Line Items]
Operating revenues:	742,982	617,823	1,535,077	1,332,997
Construction materials and contracting | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	0	0	0	0
Construction materials and contracting | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	975,085	831,189	1,996,533	1,730,521
Construction materials and contracting | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	0	0	0	0
Construction services
Disaggregation of Revenue [Line Items]
Operating revenues:	734,809	514,523	1,969,995	1,556,737
Construction services | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(2,229)	(289)	(5,090)	(2,128)
Construction services | Electrical & mechanical specialty contracting
Disaggregation of Revenue [Line Items]
Operating revenues:	543,717	317,238	1,443,758	1,020,130
Construction services | Transmission & distribution specialty contracting
Disaggregation of Revenue [Line Items]
Operating revenues:	181,550	185,842	496,190	502,328
Construction services | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	200	75	357	168
Construction services | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	723,238	502,866	1,935,215	1,520,498
Construction services | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	11,571	11,657	34,780	36,239
Other
Disaggregation of Revenue [Line Items]
Operating revenues:	0	25	0	70
Other | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Operating revenues:	(4,438)	(3,398)	(13,168)	(10,082)
Other | Other
Disaggregation of Revenue [Line Items]
Operating revenues:	4,438	3,423	13,168	10,152
Other | Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Operating revenues:	0	25	0	70
Other | Other revenues
Disaggregation of Revenue [Line Items]
Operating revenues:	$ 0	$ 0	$ 0	$ 0

XML

Contract balances (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 265,585		$ 265,585		$ 125,742
Change in contract assets			139,843
Contract liabilities - current	(216,439)		(216,439)		(179,140)
Change in contract liabilities - current			(37,299)
Contract liabilities - noncurrent	(12)		(12)		(118)
Change in contract liabilities - noncurrent			106
Net contract assets (liabilities)	49,134		49,134		$ (53,516)
Change in net contract assets (liabilities)			102,650
Amounts included in contract liability at the beginning of the period	11,200	$ 7,100	147,900	$ 152,400
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 14,500	$ 19,200	$ 54,100	$ 63,300

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Revenue from contracts with customers Remaining performance obligations (Details 3) $ in Millions	Sep. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,300.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,600.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 369.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	13 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 418.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	25 months

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Business Combinations (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 763,262,000	$ 765,386,000	$ 717,646,000	$ 714,963,000
Business Acquisition, Transaction Costs	0		$ 0
2021 Acquisition
Business Acquisition [Line Items]
Gross Aggregate Consideration		236,100,000
Cash Assumed		900,000
Business Combination, Consideration Transferred		235,200,000
Current Assets		17,000,000
Property, Plant, and Equipment		179,800,000
Goodwill		50,600,000
Other Intangibles		2,200,000
Current Liabilities		8,700,000
Noncurrent Liabilities - Other		2,500,000
Deferred Tax Liabilities		$ 3,200,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	$ 2,100,000

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Lessor accounting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating Lease, Lease Income	$ 11.7	$ 11.8	$ 35.1	$ 36.6
Lessor, Operating Lease, Payments to be Received, Next Twelve Months	$ 9.1		$ 9.1

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Goodwill rollforward (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill [Roll Forward]
Balance at beginning of period	$ 765,386	$ 714,963	$ 714,963
Goodwill acquired during the year	0	2,900	50,640
Measurement period adjustments	(2,124)	(217)	(217)
Balance at end of period	763,262	717,646	765,386
Natural gas distribution
Goodwill [Roll Forward]
Balance at beginning of period	345,736	345,736	345,736
Goodwill acquired during the year	0	0	0
Measurement period adjustments	0	0	0
Balance at end of period	345,736	345,736	345,736
Construction materials and contracting
Goodwill [Roll Forward]
Balance at beginning of period	276,426	226,003	226,003
Goodwill acquired during the year	0	2,900	50,640
Measurement period adjustments	(2,124)	(217)	(217)
Balance at end of period	274,302	228,686	276,426
Construction services
Goodwill [Roll Forward]
Balance at beginning of period	143,224	143,224	143,224
Goodwill acquired during the year	0	0	0
Measurement period adjustments	0	0	0
Balance at end of period	$ 143,224	$ 143,224	$ 143,224

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Other intangible assets (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net (excluding goodwill)	$ 18,745	$ 22,241	$ 18,745	$ 22,241	$ 22,578
Amortization of intangible assets	1,300	1,200	3,800	3,900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	28,990	29,423	28,990	29,423	29,740
Intangible assets, less accumulated amortization	12,768	9,705	12,768	9,705	10,650
Intangible assets, net (excluding goodwill)	16,222	19,718	16,222	19,718	19,090
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,591	3,991	4,591	3,991	4,591
Intangible assets, less accumulated amortization	3,377	2,710	3,377	2,710	2,856
Intangible assets, net (excluding goodwill)	1,214	1,281	1,214	1,281	1,735
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	5,279	11,957	5,279	11,957	12,601
Intangible assets, less accumulated amortization	3,970	10,715	3,970	10,715	10,848
Intangible assets, net (excluding goodwill)	$ 1,309	$ 1,242	$ 1,309	$ 1,242	$ 1,753

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Future amortization expense (Details 3) $ in Thousands	Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2022	$ 1,159
2023	4,591
2024	4,249
2025	2,200
2026	1,781
Thereafter	$ 4,765

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Regulatory assets (Details) - USD ($)		9 Months Ended
	Oct. 19, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Feb. 28, 2021
Regulatory Assets
Regulatory Assets, Current		$ 148,160,000	$ 118,691,000	$ 133,135,000
Regulatory Assets, Noncurrent		344,442,000	357,851,000	379,245,000
Total regulatory assets		492,602,000	476,542,000	512,380,000
Regulatory assets not earning a rate of return		264,400,000	296,600,000	318,200,000
Gas Distribution [Member] | MNPUC [Member] | Subsequent Event [Member] | Great Plains Natural Gas Co. [Member]
Regulatory Assets
Disallowed Gas Costs	$ (845,000)
Natural gas costs recoverable through rate adjustments
Regulatory Assets
Regulatory Assets, Current		112,079,000	86,371,000	98,211,000
Regulatory Assets, Noncurrent		$ 462,000	5,186,000	6,084,000
Total regulatory assets					$ 44,000,000
Natural gas costs recoverable through rate adjustments | Minimum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 1 year
Natural gas costs recoverable through rate adjustments | Maximum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 2 years
Conservation programs
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 1 year
Regulatory Assets, Current		$ 9,363,000	8,225,000	8,495,000
Decoupling
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 1 year
Regulatory Assets, Current		$ 6,549,000	9,131,000	7,195,000
Cost recovery mechanisms
Regulatory Assets
Regulatory Assets, Current		3,354,000	4,536,000	4,693,000
Regulatory Assets, Noncurrent		$ 67,094,000	44,870,000	43,955,000
Cost recovery mechanisms | Minimum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 1 year
Cost recovery mechanisms | Maximum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 10 years
Other regulatory assets
Regulatory Assets
Regulatory Assets, Current		$ 16,815,000	10,428,000	14,541,000
Regulatory Assets, Noncurrent		$ 10,931,000	9,742,000	9,856,000
Other regulatory assets | Minimum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 1 year
Other regulatory assets | Maximum [Member]
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 17 years
Pension and postretirement benefits
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		**
Regulatory Assets, Noncurrent		$ 137,582,000	142,681,000	155,888,000
Plant costs/asset retirement obligations
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Over plant lives
Regulatory Assets, Noncurrent		$ 61,941,000	63,116,000	73,528,000
Plant to be retired
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		-
Regulatory Assets, Noncurrent		$ 24,740,000	50,070,000	48,544,000
Manufactured gas plant site remediation
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		-
Regulatory Assets, Noncurrent		$ 25,963,000	26,053,000	26,000,000
Taxes recoverable from customers
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Over plant lives
Regulatory Assets, Noncurrent		$ 12,394,000	12,339,000	11,438,000
Long-term debt refinancing costs
Regulatory Assets
Estimated Recovery or Refund Period as of September 30, 2022		Up to 38 years
Regulatory Assets, Noncurrent		$ 3,335,000	$ 3,794,000	$ 3,952,000

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Regulatory liabilities (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Regulatory Liabilities [Line Items]
Regulatory liabilities due within one year	$ 18,599	$ 16,303	$ 16,491
Regulatory liabilities	433,212	428,790	426,141
Total regulatory liabilities	451,811	445,093	442,632
Net regulatory position	40,791	31,449	69,748
Taxes refundable to customers
Regulatory Liabilities [Line Items]
Regulatory liabilities due within one year	4,264	3,841	3,867
Regulatory liabilities	$ 205,517	215,421	218,566
Taxes refundable to customers | Minimum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 1 year
Taxes refundable to customers | Maximum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Over plant lives
Electric fuel and purchased power deferral
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 1 year
Regulatory liabilities due within one year	$ 3,763	0	3,205
Cost Recovery Mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities due within one year	2,674	214	2,797
Regulatory liabilities	$ 12,535	7,727	0
Cost Recovery Mechanisms | Minimum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 1 year
Cost Recovery Mechanisms | Maximum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 20 years
Natural gas costs refundable through rate adjustments
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 1 year
Regulatory liabilities due within one year	$ 873	6,700	0
Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities due within one year	7,025	5,548	6,622
Regulatory liabilities	$ 6,327	4,360	5,574
Other regulatory liabilities | Minimum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 1 year
Other regulatory liabilities | Maximum [Member]
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 16 years
Plant removal and decommissioning costs
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Over plant lives
Regulatory liabilities	$ 174,481	168,152	172,683
Pension and postretirement benefits
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	**
Regulatory liabilities	$ 19,687	20,434	16,915
Accumulated Deferred ITC
Regulatory Liabilities [Line Items]
Estimated Recovery or Refund Period as of September 30, 2022	Up to 20 years
Regulatory liabilities	$ 14,665	$ 12,696	$ 12,403

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Fair value measurements Insurance contracts (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Investments used to satisfy nonqualified benefit plans obligations	$ 95,200,000	$ 106,400,000	$ 95,200,000	$ 106,400,000	$ 109,600,000
Net unrealized gain (loss) on investments used to satisfy obligations under nonqualified benefit plans	$ 2,600,000	$ 373,000	$ 16,800,000	$ 4,200,000

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Available-for-sale securities (Details 2) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Available-for-sale securities [Abstract]
Cost	$ 10,954	$ 11,109	$ 11,278
Gross Unrealized Gains	0	51	93
Gross Unrealized Losses	865	58	39
Fair Value	10,089	11,102	11,332
Mortgage-backed securities
Available-for-sale securities [Abstract]
Cost	8,486	8,702	8,597
Gross Unrealized Gains	0	51	93
Gross Unrealized Losses	783	47	11
Fair Value	7,703	8,706	8,679
U.S. Treasury securities
Available-for-sale securities [Abstract]
Cost	2,468	2,407	2,681
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	82	11	28
Fair Value	$ 2,386	$ 2,396	$ 2,653

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Fair value measurements (Details 3) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Concentration risks, percentage [Abstract]
Percentage in fixed-income and other investments	65.00%	61.00%	63.00%
Percentage investment in common stock of large-cap companies	14.00%	17.00%	16.00%
Percentage investment in common stock of mid-cap companies	7.00%	8.00%	8.00%
Percentage investment in common stock of small-cap companies	6.00%	7.00%	7.00%
Percentage investment in target date investments	6.00%	5.00%	5.00%
Percentage investment in cash and cash equivalents	2.00%	2.00%	1.00%
Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	$ 112,568	$ 130,895	$ 127,610
Fair value, inputs, level 2 | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	112,568	130,895	127,610
Money market funds | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	7,309	10,190	9,907
Money market funds | Fair value, inputs, level 2 | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	7,309	10,190	9,907
Insurance contracts* | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	95,170	109,603	106,371
Insurance contracts* | Fair value, inputs, level 2 | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	95,170	109,603	106,371
Mortgage-backed securities | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	7,703	8,706	8,679
Mortgage-backed securities | Fair value, inputs, level 2 | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	7,703	8,706	8,679
U.S. Treasury securities | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	2,386	2,396	2,653
U.S. Treasury securities | Fair value, inputs, level 2 | Fair value, measurements, recurring
Fair value measurements [Line Items]
Assets, fair value disclosure	$ 2,386	$ 2,396	$ 2,653

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Fair value measurements (Details 4) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Fair value, balance sheet grouping [Line Items]
Long-term debt	$ 2,988,452	$ 2,741,900	$ 2,328,266
Carrying amount
Fair value, balance sheet grouping [Line Items]
Long-term debt	2,988,452	2,741,900	2,328,266
Fair value
Fair value, balance sheet grouping [Line Items]
Long-term debt, fair value	$ 2,647,387	$ 2,984,866	$ 2,599,907

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Short-term Debt (Details 1) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 18, 2022	Dec. 31, 2021	Sep. 30, 2021
Short-term Debt [Line Items]
Short-term borrowings	$ 100,000		$ 0	$ 50,000
Term Loan Agreement | Centennial Energy Holdings, Inc.
Short-term Debt [Line Items]
Short-term borrowings		$ 100,000
Ratio of total debt to total capitalization as specified in debt covenants		65.00%

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Long-term debt outstanding (Details 2) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Long-term debt outstanding [Line Items]
Long-term debt	$ 2,988,452	$ 2,741,900	$ 2,328,266
Long-term debt due within one year	214,453	148,053	1,548
Long-term debt	$ 2,773,999	2,593,847	2,326,718
Senior Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	4.29%
Long-term debt	$ 2,365,000	2,125,000	2,025,000
Commercial Paper
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	3.66%
Long-term debt	$ 460,600	450,300	168,800
Credit Agreements
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	4.55%
Long-term debt	$ 125,580	127,500	94,300
Medium-term Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	7.32%
Long-term debt	$ 35,000	35,000	35,000
Term Loan Agreements
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	3.64%
Long-term debt	$ 7,000	7,700	7,700
Other Notes
Long-term debt outstanding [Line Items]
Weighted Average Interest Rate	0.97%
Long-term debt	$ 2,349	2,564	3,198
Long-term Debt
Long-term debt outstanding [Line Items]
Unamortized Debt Issuance Costs	6,633	6,090	5,709
Discount	$ 444	$ 74	$ 23

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Schedule of debt maturities (Details 3) $ in Thousands	Sep. 30, 2022 USD ($)
Long-term debt maturities [Line Items]
Remainder of 2022	$ 147,253
2023	77,923
2024	646,983
2025	177,802
2026	140,802
Thereafter	$ 1,804,766

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Cash flow information (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Interest, net*	$ 75,425	$ 59,876
Income taxes paid, net	17,664	61,250
AFUDC borrowed	2,400	1,600
Right-of-use assets obtained in exchange for new operating lease liabilities	36,492	26,120	$ 55,987
Property, plant and equipment additions in accounts payable	44,277	88,355	57,605
Debt assumed in connection with a business combination	$ 0	$ 0	$ 10

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Business segment data (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,977,206			$ 1,586,013			$ 5,114,686	$ 4,237,608
Operating income	209,851			189,169			397,763	412,023
Income from continuing operations	147,933			138,962			250,298	291,249
Discontinued operations, net of tax	38			314			103	348
Net income	147,971	$ 70,667	$ 31,763	139,276	$ 100,190	$ 52,131	250,401	291,597
Electric
Segment Reporting Information [Line Items]
Revenues	99,193			98,930			278,249	267,254
Operating income	30,395			27,310			53,764	53,982
Natural gas distribution
Segment Reporting Information [Line Items]
Revenues	132,074			110,378			792,932	614,373
Operating income	(16,688)			(14,249)			38,929	42,925
Pipeline
Segment Reporting Information [Line Items]
Revenues	36,045			30,968			76,977	68,653
Operating income	14,963			12,284			39,447	35,896
Construction materials and contracting
Segment Reporting Information [Line Items]
Revenues	975,085			831,189			1,996,533	1,730,521
Operating income	147,367			133,712			157,116	171,274
Construction services
Segment Reporting Information [Line Items]
Revenues	734,809			514,523			1,969,995	1,556,737
Operating income	34,949			30,120			110,588	108,172
Other
Segment Reporting Information [Line Items]
Revenues	0			25			0	70
Operating income	(1,135)			(8)			(2,081)	(226)
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenues	(10,868)			(7,983)			(57,047)	(51,356)
Intersegment eliminations | Electric
Segment Reporting Information [Line Items]
Revenues	(124)			(136)			(371)	(407)
Intersegment eliminations | Natural gas distribution
Segment Reporting Information [Line Items]
Revenues	(139)			(142)			(416)	(425)
Intersegment eliminations | Pipeline
Segment Reporting Information [Line Items]
Revenues	(3,595)			(3,908)			(37,328)	(38,000)
Intersegment eliminations | Construction materials and contracting
Segment Reporting Information [Line Items]
Revenues	(343)			(110)			(674)	(314)
Intersegment eliminations | Construction services
Segment Reporting Information [Line Items]
Revenues	(2,229)			(289)			(5,090)	(2,128)
Intersegment eliminations | Other
Segment Reporting Information [Line Items]
Revenues	(4,438)			(3,398)			(13,168)	(10,082)
Total intersegment operating revenues
Segment Reporting Information [Line Items]
Revenues	0			0			0	0
Regulated operation
Segment Reporting Information [Line Items]
Revenues	263,614			237,065			1,140,528	940,017
Income from continuing operations	12,917			15,399			72,761	89,207
Regulated operation | Electric
Segment Reporting Information [Line Items]
Revenues	99,193			98,930			278,249	267,254
Income from continuing operations	21,596			20,564			37,476	41,618
Regulated operation | Natural gas distribution
Segment Reporting Information [Line Items]
Revenues	132,074			110,378			792,932	614,373
Income from continuing operations	(18,058)			(15,390)			10,758	20,081
Regulated operation | Pipeline
Segment Reporting Information [Line Items]
Revenues	32,347			27,757			69,347	58,390
Income from continuing operations	9,379			10,225			24,527	27,508
Regulated operation | Intersegment eliminations
Segment Reporting Information [Line Items]
Revenues	3,771			4,123			37,632	38,362
Regulated operation | Intersegment eliminations | Electric
Segment Reporting Information [Line Items]
Revenues	124			136			371	407
Regulated operation | Intersegment eliminations | Natural gas distribution
Segment Reporting Information [Line Items]
Revenues	139			142			416	425
Regulated operation | Intersegment eliminations | Pipeline
Segment Reporting Information [Line Items]
Revenues	3,508			3,845			36,845	37,530
Nonregulated operation
Segment Reporting Information [Line Items]
Revenues	1,713,592			1,348,948			3,974,158	3,297,591
Income from continuing operations	135,016			123,563			177,537	202,042
Nonregulated operation | Pipeline
Segment Reporting Information [Line Items]
Revenues	3,698			3,211			7,630	10,263
Income from continuing operations	492			356			(187)	1,166
Nonregulated operation | Construction materials and contracting
Segment Reporting Information [Line Items]
Revenues	975,085			831,189			1,996,533	1,730,521
Income from continuing operations	102,764			96,282			95,337	116,865
Nonregulated operation | Construction services
Segment Reporting Information [Line Items]
Revenues	734,809			514,523			1,969,995	1,556,737
Income from continuing operations	27,977			23,130			83,755	81,839
Nonregulated operation | Other
Segment Reporting Information [Line Items]
Revenues	0			25			0	70
Income from continuing operations	3,783			3,795			(1,368)	2,172
Nonregulated operation | Intersegment eliminations
Segment Reporting Information [Line Items]
Revenues	7,097			3,860			19,415	12,994
Nonregulated operation | Intersegment eliminations | Pipeline
Segment Reporting Information [Line Items]
Revenues	87			63			483	470
Nonregulated operation | Intersegment eliminations | Construction materials and contracting
Segment Reporting Information [Line Items]
Revenues	343			110			674	314
Nonregulated operation | Intersegment eliminations | Construction services
Segment Reporting Information [Line Items]
Revenues	2,229			289			5,090	2,128
Nonregulated operation | Intersegment eliminations | Other
Segment Reporting Information [Line Items]
Revenues	$ 4,438			$ 3,398			$ 13,168	$ 10,082

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Employee benefit plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Qualified plan | Underfunded plan | Pension benefits
Defined benefit plan disclosure, net periodic benefit cost [Line Items]
Interest cost	$ 2,630,000	$ 2,455,000	$ 7,892,000	$ 7,365,000
Expected return on assets	(4,864,000)	(4,894,000)	(14,592,000)	(14,682,000)
Amortization of net actuarial (gain) loss	1,670,000	2,004,000	5,012,000	6,012,000
Net periodic benefit cost (credit)	(564,000)	(435,000)	(1,688,000)	(1,305,000)
Qualified plan | Overfunded Plan | Other postretirement benefits
Defined benefit plan disclosure, net periodic benefit cost [Line Items]
Service cost	354,000	400,000	1,062,000	1,200,000
Interest cost	474,000	466,000	1,422,000	1,398,000
Expected return on assets	(1,322,000)	(1,275,000)	(3,966,000)	(3,825,000)
Amortization of prior service credit	(350,000)	(349,000)	(1,050,000)	(1,047,000)
Amortization of net actuarial (gain) loss	(55,000)	6,000	(163,000)	18,000
Net periodic benefit credit, including amount capitalized	(899,000)	(752,000)	(2,695,000)	(2,256,000)
Less amount capitalized	48,000	46,000	132,000	129,000
Net periodic benefit cost (credit)	(947,000)	(798,000)	(2,827,000)	(2,385,000)
Nonqualified plan | Unfunded plan | Supplemental employee retirement plans
Defined benefit plan disclosure, net periodic benefit cost [Line Items]
Net periodic benefit cost (credit)	$ 773,000	$ 769,000	$ 2,300,000	$ 2,300,000

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MNPUC (Details) - MNPUC [Member] - Gas Distribution [Member] - Great Plains Natural Gas Co. [Member] - USD ($)	Oct. 19, 2022	Jun. 01, 2022	Sep. 01, 2021
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 8,800,000
Pending Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Depreciation and Amortization Requested Rate Increase (Decrease), Amount		$ (1,200,000)
Depreciation and Amortization, Rate, Percent		4.50%
Depreciation and Amortization, Requested Rate, Percent		2.80%
Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Disallowed Gas Costs	$ (845,000)

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NDPSC (Details 2) - Electric - NDPSC [Member] - Montana-Dakota Utilities Co. [Member] - USD ($)	Nov. 01, 2022	Jul. 14, 2022	May 16, 2022
Public Utilities, General Disclosures [Line Items]
Public Utilities, Interim Rate Increase (Decrease), Amount		$ 10,900,000
Public Utilities, Interim Rate Increase (Decrease), Percentage		5.30%
Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Total Transmission Cost Adjustment Rider	$ 12,900,000
Public Utilities, Approved Rate Increase (Decrease), Amount	(1,600,000)
Pending Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 25,400,000
Public Utilities, Requested Rate Increase (Decrease), Percentage			12.30%
Pending Rate Case [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	(127,000)
Renewable Resource Cost Adjustment Rate Tariff	$ 17,900,000

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WUTC (Details 3) - WUTC [Member] - Cascade Natural Gas [Member] - USD ($) $ in Millions	Nov. 01, 2022	Sep. 01, 2022	Mar. 24, 2022	Mar. 22, 2022	Sep. 30, 2021
Gas Distribution [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount					$ 13.7
Public Utilities, Requested Rate Increase (Decrease), Percentage					5.10%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount				$ 10.7
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage				4.00%
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 7.2
Pipeline Cost Recovery Mechanism | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 1.2
Public Utilities, Approved Rate Increase (Decrease), Percentage	0.40%
Pending Rate Case [Member] | Gas Distribution [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 3.3

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FERC (Details 4) $ in Millions	Jan. 01, 2023 USD ($)
Electric | FERC [Member] | Montana-Dakota Utilities Co. [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Transmission Formula Revenue Requirement	$ 15.4

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Litigation (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Loss Contingencies [Line Items]
Potential liabilities related to litigation and environmental matters	$ 33.6	$ 37.0	$ 34.7
Insurance Receivable	11.9	14.1	11.7
Regulatory Assets	$ 20.5	$ 21.2	$ 21.1

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Guarantees (Details 2)	Sep. 30, 2022 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 333,700,000
Fixed maximum amounts guaranteed by year 2022	10,800,000
Fixed maximum amounts guaranteed by year 2023	68,600,000
Fixed maximum amounts guaranteed by year 2024	110,600,000
Fixed maximum amounts guaranteed by year 2025	130,500,000
Fixed maximum amounts guaranteed by year 2026	1,300,000
Fixed maximum amounts guaranteed, thereafter	700,000
No scheduled maturity date	11,200,000
Amount outstanding under guarantees that is reflected on balance sheet	0
Letters of credit	25,000,000
Letters of credit set to expire - 2022	21,800,000
Letters of credit set to expire - 2023	2,700,000
Letters of credit set to expire - 2024	500,000
Outstanding letters of credit	0
Amount of surety bonds outstanding	$ 932,400,000

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Variable interest entities (Details 3) $ in Millions	Sep. 30, 2022 USD ($)
Fuel contract
Variable Interest Entities [Line Items]
Variable interest entity, reporting entity involvement, maximum loss exposure, amount	$ 30.0