Black Hills (BKH) 10-Q 3 Aug 23 2023 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-31303
Entity Registrant Name	Black Hills Corporation
Entity Incorporation, State or Country Code	SD
Entity Tax Identification Number	46-0458824
Entity Address, Address Line One	7001 Mount Rushmore Road
Entity Address, City or Town	Rapid City
Entity Address, State or Province	SD
Entity Address, Postal Zip Code	57702
City Area Code	605
Local Phone Number	721-1700
Title of 12(b) Security	Common stock of $1.00 par value
Trading Symbol	BKH
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		67,110,952
Entity Central Index Key	0001130464
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Revenue	$ 411,283	$ 474,195	$ 1,332,442	$ 1,297,765
Operating expenses:
Fuel, purchased power and cost of natural gas sold	121,245	188,171	647,512	625,097
Operations and maintenance	145,767	132,968	286,755	269,100
Depreciation, depletion and amortization	64,714	64,128	126,357	124,591
Taxes - property and production	16,041	16,539	33,419	33,235
Total operating expenses	347,767	401,806	1,094,043	1,052,023
Operating income	63,516	72,389	238,399	245,742
Other income (expense):
Interest expense incurred net of amounts capitalized	(43,267)	(39,053)	(87,332)	(77,874)
Interest income	1,746	289	2,307	565
Other income (expense), net	(1,540)	1,563	(866)	2,267
Total other income (expense)	(43,061)	(37,201)	(85,891)	(75,042)
Income before income taxes	20,455	35,188	152,508	170,700
Income tax benefit (expense)	6,089	658	(8,584)	(13,830)
Net income	26,544	35,846	143,924	156,870
Net income attributable to non-controlling interest	(3,491)	(2,431)	(6,787)	(5,929)
Net income available for common stock	$ 23,053	$ 33,415	$ 137,137	$ 150,941
Earnings per share of common stock:
Earnings per share, Basic (usd per share)	$ 0.35	$ 0.52	$ 2.07	$ 2.33
Earnings per share, Diluted (usd per share)	$ 0.35	$ 0.52	$ 2.06	$ 2.33
Weighted average common shares outstanding:
Basic (in shares)	66,591	64,721	66,315	64,643
Diluted (in shares)	66,684	64,883	66,419	64,822

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 26,544	$ 35,846	$ 143,924	$ 156,870
Other comprehensive income (loss), net of tax:
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $--, $8, $-- and $14, respectively)	0	(14)	0	(32)
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(27), $(68), $(43) and $(113), respectively)	16	119	44	262
Net unrealized gains (losses) on commodity derivatives (net of tax of $(35), $734, $233 and $394, respectively)	112	(2,314)	(743)	(1,267)
Other comprehensive income (loss), net of tax	1,035	(2,738)	2,255	(2,732)
Comprehensive income	27,579	33,108	146,179	154,138
Less: comprehensive income attributable to non-controlling interest	(3,491)	(2,431)	(6,787)	(5,929)
Comprehensive income available for common stock	24,088	30,677	139,392	148,209
Interest rate swaps
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	536	475	1,099	1,011
Commodity derivatives
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	$ 371	$ (1,004)	$ 1,855	$ (2,706)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	$ (27)	$ (68)	$ (43)	$ (113)
(Tax) benefit on reclassification adjustment of benefit plan liability - prior service cost	0	8	0	14
Interest Rate Swap
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit)	(177)	(238)	(327)	(415)
Commodity Contract
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit)	(118)	319	(584)	871
(Tax) benefit on net unrealized gains (losses) on commodity derivatives	$ (35)	$ 734	$ 233	$ 394

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 152,581	$ 21,430
Restricted cash and equivalents	5,966	5,555
Accounts receivable, net	260,350	508,192
Materials, supplies and fuel	136,534	207,421
Derivative assets, current	303	582
Income tax receivable, net	18,222	17,637
Regulatory assets, current	198,443	260,312
Other current assets	29,929	50,579
Total current assets	802,328	1,071,708
Property, plant and equipment	8,590,796	8,374,790
Less accumulated depreciation and depletion	(1,671,303)	(1,576,842)
Total property, plant and equipment, net	6,919,493	6,797,948
Other assets:
Goodwill	1,299,454	1,299,454
Intangible assets, net	9,002	9,589
Regulatory assets, non-current	325,228	392,669
Other assets, non-current	53,590	46,862
Total other assets, non-current	1,687,274	1,748,574
TOTAL ASSETS	9,409,095	9,618,230
Current liabilities:
Accounts payable	133,300	310,020
Accrued liabilities	217,259	243,457
Derivative liabilities, current	322	6,600
Regulatory liabilities, current	101,979	46,013
Notes payable	0	535,600
Current maturities of long-term debt	525,000	525,000
Total current liabilities	977,860	1,666,690
Long-term debt, net of current maturities	3,955,745	3,607,340
Deferred credits and other liabilities:
Deferred income tax liabilities, net	528,627	508,941
Regulatory liabilities, non-current	469,509	472,560
Benefit plan liabilities	118,841	116,742
Other deferred credits and other liabilities	155,746	156,062
Total deferred credits and other liabilities	1,272,723	1,254,305
Commitments, contingencies and guarantees (Note 3)
Equity:
Common stock $1 par value; 100,000,000 shares authorized; issued 67,115,403 and 66,140,396 shares, respectively	67,115	66,140
Additional paid-in capital	1,941,234	1,882,653
Retained earnings	1,118,145	1,064,122
Treasury stock, at cost - 48,623 and 36,726 shares, respectively	(3,167)	(2,435)
Accumulated other comprehensive income (loss)	(13,312)	(15,567)
Total stockholders’ equity	3,110,015	2,994,913
Non-controlling interest	92,752	94,982
Total equity	3,202,767	3,089,895
TOTAL LIABILITIES AND TOTAL EQUITY	$ 9,409,095	$ 9,618,230

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares, issued	67,115,403	66,140,396
Treasury stock, shares	48,623	36,726

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net income	$ 143,924	$ 156,870
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	126,357	124,591
Deferred financing cost amortization	4,853	4,953
Stock compensation	4,311	3,834
Deferred income taxes	9,203	13,860
Employee benefit plans	5,898	1,383
Other adjustments, net	(6,754)	(9,489)
Change in certain operating assets and liabilities:
Materials, supplies and fuel	73,022	(6,993)
Accounts receivable and other current assets	266,820	55,641
Accounts payable and other current liabilities	(201,389)	(24,130)
Regulatory assets	186,699	128,315
Other operating activities, net	(7,873)	(6,805)
Net cash provided by operating activities	605,071	442,030
Investing activities:
Property, plant and equipment additions	(261,739)	(293,803)
Other investing activities	16,367	2,418
Net cash (used in) investing activities	(245,372)	(291,385)
Financing activities:
Dividends paid on common stock	(83,114)	(77,136)
Common stock issued	54,689	20,095
Net borrowings (payments) of Revolving Credit Facility and CP Program	(535,600)	(85,130)
Long-term debt - issuance	350,000	0
Distributions to non-controlling interests	(9,017)	(8,604)
Other financing activities	(5,095)	1,682
Net cash (used in) financing activities	(228,137)	(149,093)
Net change in cash, restricted cash and cash equivalents	131,562	1,552
Cash, restricted cash and cash equivalents beginning of period	26,985	13,810
Cash, restricted cash and cash equivalents end of period	158,547	15,362
Supplemental cash flow information:
Interest (net of amounts capitalized)	(75,507)	(72,791)
Income taxes	34	752
Accrued property, plant and equipment purchases at June 30,	$ 50,081	$ 49,229

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2021		64,793,095	54,078
Beginning balance at Dec. 31, 2021	$ 2,887,123	$ 64,793	$ (3,509)	$ 1,783,436	$ 962,458	$ (20,084)	$ 100,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	121,024				117,526		3,498
Other comprehensive income, net of tax	6					6
Dividends on common stock	(38,533)				(38,533)
Share-based compensation (in shares)		425	(34,393)
Share-based compensation	2,031		$ 2,222	(191)
Issuance of common stock (in shares)		55,707
Issuance of common stock	3,832	$ 56		3,776
Issuance costs	(41)			(41)
Distributions to non-controlling interest	(4,420)						(4,420)
Ending balance (in shares) at Mar. 31, 2022		64,849,227	19,685
Ending balance at Mar. 31, 2022	2,971,022	$ 64,849	$ (1,287)	1,786,980	1,041,451	(20,078)	99,107
Beginning balance (in shares) at Dec. 31, 2021		64,793,095	54,078
Beginning balance at Dec. 31, 2021	2,887,123	$ 64,793	$ (3,509)	1,783,436	962,458	(20,084)	100,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	156,870
Other comprehensive income, net of tax	(2,732)
Ending balance (in shares) at Jun. 30, 2022		65,105,178	23,691
Ending balance at Jun. 30, 2022	2,982,801	$ 65,105	$ (1,542)	1,808,437	1,036,263	(22,816)	97,354
Beginning balance (in shares) at Mar. 31, 2022		64,849,227	19,685
Beginning balance at Mar. 31, 2022	2,971,022	$ 64,849	$ (1,287)	1,786,980	1,041,451	(20,078)	99,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,846				33,415		2,431
Other comprehensive income, net of tax	(2,738)					(2,738)
Dividends on common stock	(38,603)				(38,603)
Share-based compensation (in shares)		39,066	4,006
Share-based compensation	5,154	$ 39	$ (255)	5,370
Issuance of common stock (in shares)		216,885
Issuance of common stock	16,570	$ 217		16,353
Issuance costs	(266)			(266)
Distributions to non-controlling interest	(4,184)						(4,184)
Ending balance (in shares) at Jun. 30, 2022		65,105,178	23,691
Ending balance at Jun. 30, 2022	2,982,801	$ 65,105	$ (1,542)	1,808,437	1,036,263	(22,816)	97,354
Beginning balance (in shares) at Dec. 31, 2022		66,140,396	36,726
Beginning balance at Dec. 31, 2022	3,089,895	$ 66,140	$ (2,435)	1,882,653	1,064,122	(15,567)	94,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	117,380				114,084		3,296
Other comprehensive income, net of tax	1,220					1,220
Dividends on common stock	(41,362)				(41,362)
Share-based compensation (in shares)		84,735	4,388
Share-based compensation	1,709	$ 85	$ (262)	1,886
Issuance of common stock (in shares)		445,578
Issuance of common stock	27,719	$ 446		27,273
Issuance costs	(336)			(336)
Distributions to non-controlling interest	(4,494)						(4,494)
Ending balance (in shares) at Mar. 31, 2023		66,670,709	41,114
Ending balance at Mar. 31, 2023	3,191,731	$ 66,671	$ (2,697)	1,911,476	1,136,844	(14,347)	93,784
Beginning balance (in shares) at Dec. 31, 2022		66,140,396	36,726
Beginning balance at Dec. 31, 2022	3,089,895	$ 66,140	$ (2,435)	1,882,653	1,064,122	(15,567)	94,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	143,924
Other comprehensive income, net of tax	2,255
Ending balance (in shares) at Jun. 30, 2023		67,115,403	48,623
Ending balance at Jun. 30, 2023	3,202,767	$ 67,115	$ (3,167)	1,941,234	1,118,145	(13,312)	92,752
Beginning balance (in shares) at Mar. 31, 2023		66,670,709	41,114
Beginning balance at Mar. 31, 2023	3,191,731	$ 66,671	$ (2,697)	1,911,476	1,136,844	(14,347)	93,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,544				23,053		3,491
Other comprehensive income, net of tax	1,035					1,035
Dividends on common stock	(41,752)				(41,752)
Share-based compensation (in shares)		8,492	7,509
Share-based compensation	2,426	$ 8	$ (470)	2,888
Issuance of common stock (in shares)		436,202
Issuance of common stock	27,710	$ 436		27,274
Issuance costs	(404)			(404)
Distributions to non-controlling interest	(4,523)						(4,523)
Ending balance (in shares) at Jun. 30, 2023		67,115,403	48,623
Ending balance at Jun. 30, 2023	$ 3,202,767	$ 67,115	$ (3,167)	$ 1,941,234	$ 1,118,145	$ (13,312)	$ 92,752

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends on common stock (usd per share)	$ 0.625	$ 0.625	$ 0.595	$ 0.595

Management's Statement

Management's Statement	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Management's Statement	(1) Management’s Statement The unaudited Consolidated Financial Statements included herein have been prepared by Black Hills Corporation (together with our subsidiaries the “Company”, “us”, “we” or “our”), pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations; however, we believe that the footnotes adequately disclose the information presented. These Consolidated Financial Statements should be read in conjunction with the consolidated financial statements and the notes included in our 2022 Annual Report on Form 10-K. Use of Estimates and Basis of Presentation The information furnished in the accompanying Consolidated Financial Statements reflects certain estimates required and all adjustments, including accruals, which are, in the opinion of management, necessary for a fair presentation of the June 30, 2023, December 31, 2022 and June 30, 2022 financial information. Certain lines of business in which we operate are highly seasonal, and our interim results of operations are not necessarily indicative of the results of operations to be expected for an entire year.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2023
Regulated Operations [Abstract]
Regulatory Matters	(2) Regulatory Matters We had the following regulatory assets and liabilities (in thousands): As of As of June 30, 2023 December 31, 2022 Regulatory assets Winter Storm Uri $ 233,299 $ 347,980 Deferred energy and fuel cost adjustments 68,708 72,580 Deferred gas cost adjustments 8,777 12,147 Gas price derivatives - 8,793 Deferred taxes on AFUDC 7,305 7,333 Employee benefit plans and related deferred taxes 88,203 89,259 Environmental 1,346 1,343 Loss on reacquired debt 18,315 19,213 Deferred taxes on flow through accounting 74,165 69,529 Decommissioning costs 2,406 3,472 Other regulatory assets 21,147 21,332 Total regulatory assets 523,671 652,981 Less current regulatory assets ( 198,443 ) ( 260,312 ) Regulatory assets, non-current $ 325,228 $ 392,669 Regulatory liabilities Deferred energy and gas costs $ 99,649 $ 41,722 Employee benefit plan costs and related deferred taxes 33,065 34,258 Cost of removal 178,668 175,614 Excess deferred income taxes 250,728 254,833 Other regulatory liabilities 9,378 12,146 Total regulatory liabilities 571,488 518,573 Less current regulatory liabilities ( 101,979 ) ( 46,013 ) Regulatory liabilities, non-current $ 469,509 $ 472,560 Regulatory Activity Except as discussed below, there have been no other significant changes to our Regulatory Matters from those previously disclosed in Note 2 of the Notes to the Consolidated Financial Statements in our 2022 Annual Report on Form 10-K. Colorado Gas RMNG Rate Review On July 12, 2023, the CPUC approved a settlement agreement for RMNG's rate review filed on October 7, 2022. The agreement is expected to generate $ 8.2 million in new annual revenue and establishes a weighted average cost of capital of 6.93 % with a capital structure that reflects an equity range of 50 % to 52 %, a debt range of 50 % to 48 % and a return on equity range of 9.5 % to 9.7 %. The settlement also shifts $ 8.3 million of SSIR revenues to base rates and terminates the SSIR. New rates were effective July 15, 2023. Colorado Gas Rate Review On May 9, 2023, Colorado Gas filed a rate review with the CPUC seeking recovery of significant infrastructure investments in its 10,000 -mile natural gas pipeline system. The rate review requests $ 27 million in new annual revenue with a capital structure of 51 % equity and 49 % debt and a return on equity of 10.49 %. The request seeks to finalize rates in the first quarter of 2024. Wyoming Gas On May 18, 2023, Wyoming Gas filed a rate review with the WPSC seeking recovery of significant infrastructure investments in its 6,400 -mile natural gas pipeline system. The rate review requests $ 19 million in new annual revenue with a capital structure of 52 % equity and 48 % debt and a return on equity of 10.49 %. Additionally, Wyoming Gas is seeking renewal of the Wyoming Integrity Rider. The request seeks to finalize rates in the first quarter of 2024. Wyoming Electric On June 1, 2022, Wyoming Electric filed a rate review with the WPSC seeking recovery of significant infrastructure investments in its 1,330 -mile electric distribution and 59 -mile electric transmission systems. On January 26, 2023, the WPSC approved a settlement agreement with intervening parties for a general rate increase. The settlement is expected to generate $ 8.7 million in new annual revenue with a capital structure of 52 % equity and 48 % debt and a return on equity of 9.75 %. New rates were effective March 1, 2023. The agreement also includes approval of a new rider that will be filed annually to recover transmission investments and expenses.

Commitment, Contingencies And G

Commitment, Contingencies And Guarantees	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Guarantees	(3) Commitments, Contingencies and Guarantees There have been no significant changes to commitments, contingencies and guarantees from those previously disclosed in Note 3 of our Notes to the Consolidated Financial Statements in our 2022 Annual Report on Form 10-K.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue	(4) Revenue The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reportable segments for the three and six months ended June 30, 2023 and 2022. Sales tax and other similar taxes are excluded from revenues. Three Months Ended June 30, 2023 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: Retail $ 156,372 $ 174,781 $ - $ 331,153 Transportation - 35,913 ( 115 ) 35,798 Wholesale 5,739 - - 5,739 Market - off-system sales 8,364 43 - 8,407 Transmission/Other 19,231 9,203 ( 4,395 ) 24,039 Revenue from contracts with customers $ 189,706 $ 219,940 $ ( 4,510 ) $ 405,136 Other revenues 3,367 2,780 - 6,147 Total revenues $ 193,073 $ 222,720 $ ( 4,510 ) $ 411,283 Timing of revenue recognition: Services transferred at a point in time $ 7,844 $ - $ - $ 7,844 Services transferred over time 181,862 219,940 ( 4,510 ) 397,292 Revenue from contracts with customers $ 189,706 $ 219,940 $ ( 4,510 ) $ 405,136 Three Months Ended June 30, 2022 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: Retail $ 169,032 $ 229,074 $ - $ 398,106 Transportation - 34,667 ( 100 ) 34,567 Wholesale 8,428 - - 8,428 Market - off-system sales 8,666 178 - 8,844 Transmission/Other 15,183 9,344 ( 4,148 ) 20,379 Revenue from contracts with customers $ 201,309 $ 273,263 $ ( 4,248 ) $ 470,324 Other revenues 3,070 906 ( 105 ) 3,871 Total revenues $ 204,379 $ 274,169 $ ( 4,353 ) $ 474,195 Timing of revenue recognition: Services transferred at a point in time $ 6,671 $ - $ - $ 6,671 Services transferred over time 194,638 273,263 ( 4,248 ) 463,653 Revenue from contracts with customers $ 201,309 $ 273,263 $ ( 4,248 ) $ 470,324 Six Months Ended June 30, 2023 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: (in thousands) Retail $ 331,275 $ 810,326 $ - $ 1,141,601 Transportation - 88,756 ( 230 ) 88,526 Wholesale 15,137 - - 15,137 Market - off-system sales 24,488 324 - 24,812 Transmission/Other 36,635 19,226 ( 8,746 ) 47,115 Revenue from contracts with customers $ 407,535 $ 918,632 $ ( 8,976 ) $ 1,317,191 Other revenues 4,247 11,004 - 15,251 Total revenues $ 411,782 $ 929,636 $ ( 8,976 ) $ 1,332,442 Timing of revenue recognition: Services transferred at a point in time $ 16,501 $ - $ - $ 16,501 Services transferred over time 391,034 918,632 ( 8,976 ) 1,300,690 Revenue from contracts with customers $ 407,535 $ 918,632 $ ( 8,976 ) $ 1,317,191 Six Months Ended June 30, 2022 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: (in thousands) Retail $ 341,838 $ 790,087 $ - $ 1,131,925 Transportation - 84,190 ( 199 ) 83,991 Wholesale 18,703 - - 18,703 Market - off-system sales 15,820 416 - 16,236 Transmission/Other 30,616 18,919 ( 8,297 ) 41,238 Revenue from contracts with customers $ 406,977 $ 893,612 $ ( 8,496 ) $ 1,292,093 Other revenues 3,940 1,949 ( 217 ) 5,672 Total revenues $ 410,917 $ 895,561 $ ( 8,713 ) $ 1,297,765 Timing of revenue recognition: Services transferred at a point in time $ 13,784 $ - $ - $ 13,784 Services transferred over time 393,193 893,612 ( 8,496 ) 1,278,309 Revenue from contracts with customers $ 406,977 $ 893,612 $ ( 8,496 ) $ 1,292,093

Financing

Financing	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Financing	(5) Financing Shelf Registration Statement We maintain an effective shelf registration statement with the SEC under which we may issue, from time to time, an unspecified amount of senior debt securities, subordinated debt securities, common stock, preferred stock, warrants and other securities. In anticipation of the approaching expiration of our previous shelf registration statement on Form S-3 originally filed on August 4, 2020 (Registration No. 333-240320), we filed a new shelf registration statement on Form S-3 on June 16, 2023 (Registration No. 333-272739). Short-term Debt Revolving Credit Facility and CP Program On May 9, 2023, we amended and restated our corporate Revolving Credit Facility, which replaced LIBOR as a benchmark interest rate with the SOFR. The adoption of SOFR as a benchmark interest rate was in advance of the scheduled elimination of LIBOR as a benchmark interest rate on June 30, 2023. No other significant terms or conditions, including borrowing capacity, credit spreads or financial covenants were modified under these amendments and restatements. Our Revolving Credit Facility and CP Program, which are classified as Notes payable on the Consolidated Balance Sheets, had the following borrowings, outstanding letters of credit, and available capacity (dollars in thousands) as of: June 30, 2023 December 31, 2022 Amount outstanding $ — $ 535,600 Letters of credit (a) $ 2,751 $ 24,626 Available capacity $ 747,249 $ 189,774 Weighted average interest rates N/A 4.88 % (a) Letters of credit are off-balance sheet commitments that reduce the borrowing capacity available on our corporate Revolving Credit Facility . Revolving Credit Facility and CP Program borrowing activity was as follows (dollars in thousands): Six Months Ended June 30, 2023 2022 Maximum amount outstanding (based on daily outstanding balances) $ 548,700 $ 429,000 Average amount outstanding (based on daily outstanding balances) $ 164,719 $ 326,172 Weighted average interest rates 4.91 % 0.82 % Long-term Debt On March 7, 2023, we completed a public debt offering of $ 350 million, 5.95 % five year senior unsecured notes due March 15, 2028. The proceeds from the offering, which were net of $ 4.2 million of deferred financing costs, were used to repay notes outstanding under our CP Program and for other general corporate purposes. Debt Covenants Revolving Credit Facility We were in compliance with all of our Revolving Credit Facility covenants as of June 30, 2023 . We are required to maintain a Consolidated Indebtedness to Capitalization Ratio not to exceed 0.65 to 1.00. Subject to applicable cure periods, a violation of this covenant would constitute an event of default that entitles the lenders to terminate their remaining commitments and accelerate all principal and interest outstanding. As of June 30, 2023 , our Consolidated Indebtedness to Capitalization Ratio was 0.59 to 1.00. Wyoming Electric Wyoming Electric was in compliance with all covenants within its financing agreements as of June 30, 2023 . Wyoming Electric is required to maintain a debt to capitalization ratio of no more than 0.60 to 1.00. As of June 30, 2023 , Wyoming Electric's debt to capitalization ratio was 0.52 to 1.00. Equity At-the-Market Equity Offering Program As previously disclosed, on August 4, 2020, we entered into an Amended and Restated Equity Distribution Sales Agreement ("Previous Sales Agreement") to sell shares of common stock up to an aggregate of $ 400 million, from time to time, through our ATM program utilizing our shelf registration statement. In conjunction with the new shelf registration statement filing discussed above, we entered into a new Equity Distribution Sales Agreement ("Sales Agreement") on June 16, 2023. We also terminated the Previous Sales Agreement on June 16, 2023. The Sales Agreement is similar to the Previous Sales Agreement and allows us to sell shares of common stock up to an aggregate of $ 400 million through our ATM program. ATM activity was as follows (net proceeds and issuance costs in millions): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 August 4, 2020 ATM Program Proceeds, (net of issuance costs of $( 0.2 ), $( 0.2 ), $( 0.5 ) and $( 0.2 ), respectively) $ 21.0 $ 16.4 $ 48.5 $ 20.2 Number of shares issued 329,647 216,885 775,225 272,592 June 16, 2023 ATM Program Proceeds, (net of issuance costs of $( 0.1 ), $ 0 , $( 0.1 ) and $ 0 , respectively) $ 6.4 $ - $ 6.4 $ - Number of shares issued 106,555 - 106,555 - Total activity under both ATM Programs Proceeds, (net of issuance costs of $( 0.3 ), $( 0.2 ), $( 0.6 ) and $( 0.2 ), respectively) $ 27.4 $ 16.4 $ 54.9 $ 20.2 Number of shares issued 436,202 216,885 881,780 272,592 Average price per share $ 63.53 $ 76.39 $ 62.86 $ 74.84 As of June 30, 2023 , there were 46,696 shares issued under the June 16, 2023 ATM Program, but not settled. Shareholder Dividend Reinvestment and Stock Purchase Plan Effective as of July 7, 2023, we terminated our DRSPP. On July 10, 2023, we filed a post-effective amendment to amend the Registration Statement on Form S-3 (File No. 333-240319) filed with the SEC on August 4, 2020. The filing of this post-effective amendment de-registered all shares of common stock that were issuable under the DRSPP but not sold as of July 7, 2023. With the termination of the DRSPP, a direct stock purchase plan is being offered which will allow shareholders to continue making share transactions. This plan is sponsored and administered solely by EQ Shareowner Services, our transfer agent.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share	(6) Earnings Per Share A reconciliation of share amounts used to compute earnings per share in the accompanying Consolidated Statements of Income was as follows (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net income available for common stock $ 23,053 $ 33,415 $ 137,137 $ 150,941 Weighted average shares - basic 66,591 64,721 66,315 64,643 Dilutive effect of: Equity compensation 93 162 104 179 Weighted average shares - diluted 66,684 64,883 66,419 64,822 Earnings per share of common stock: Earnings per share, Basic $ 0.35 $ 0.52 $ 2.07 $ 2.33 Earnings per share, Diluted $ 0.35 $ 0.52 $ 2.06 $ 2.33 The following securities were excluded from the diluted earnings per share computation because of their anti-dilutive nature (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Equity compensation 76 - 47 - Restricted stock 1 - - 1 Anti-dilutive shares 77 - 47 1

Risk Management And Derivatives

Risk Management And Derivatives	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk Management And Derivatives	(7) Risk Management and Derivatives Market and Credit Risk Disclosures Our activities in the energy industry expose us to a number of risks in the normal operations of our businesses. Depending on the activity, we are exposed to varying degrees of market risk and credit risk. Valuation methodologies for our derivatives are detailed within Note 1 of the Notes to the Consolidated Financial Statements in our 2022 Annual Report on Form 10-K. Market Risk Market risk is the potential loss that may occur as a result of an adverse change in market price, rate or supply. We are exposed but not limited to, the following market risks: • Commodity price risk associated with our retail natural gas and wholesale electric power marketing activities and our fuel procurement for several of our gas-fired generation assets, which include market fluctuations due to unpredictable factors such as weather, geopolitical events, pandemics, market speculation, recession, inflation, pipeline constraints, and other factors that may impact natural gas and electric supply and demand; and • Interest rate risk associated with future debt, including reduced access to liquidity during periods of extreme capital markets volatility. Credit Risk Credit risk is the risk of financial loss resulting from non-performance of contractual obligations by a counterparty. We attempt to mitigate our credit exposure by conducting business primarily with high credit quality entities, setting tenor and credit limits commensurate with counterparty financial strength, obtaining master netting agreements and mitigating credit exposure with less creditworthy counterparties through parental guarantees, cash collateral requirements, letters of credit and other security agreements. We perform ongoing credit evaluations of our customers and adjust credit limits based upon payment history and the customers’ current creditworthiness, as determined by review of their current credit information. We maintain a provision for estimated credit losses based upon historical experience, changes in current market conditions, expected losses and any specific customer collection issue that is identified. Derivatives and Hedging Activity Our derivative and hedging activities included in the accompanying Consolidated Balance Sheets, Consolidated Statements of Income and Consolidated Statements of Comprehensive Income are detailed below and in Note 8 . The operations of our Utilities, including natural gas sold by our Gas Utilities and natural gas used by our Electric Utilities’ generation plants or those plants under PPAs where our Electric Utilities must provide the generation fuel (tolling agreements), expose our utility customers to natural gas price volatility. Therefore, as allowed or required by state utility commissions, we enter into commission approved hedging programs utilizing natural gas futures, options, over-the-counter swaps and basis swaps to reduce our customers’ underlying exposure to these fluctuations. These transactions are considered derivatives, and in accordance with accounting standards for derivatives and hedging, mark-to-market adjustments are recorded as Derivative assets or Derivative liabilities on the accompanying Consolidated Balance Sheets, net of balance sheet offsetting as permitted by GAAP. For our regulated Utilities’ hedging plans, unrealized and realized gains and losses, as well as option premiums and commissions on these transactions, are recorded as Regulatory assets or Regulatory liabilities in the accompanying Consolidated Balance Sheets in accordance with the state regulatory commission guidelines. When the related costs are recovered through our rates, the hedging activity is recognized in the Consolidated Statements of Income. We use wholesale power purchase and sale contracts to manage purchased power costs and load requirements associated with serving our electric customers. Periodically, certain wholesale energy contracts are considered derivative instruments due to not qualifying for the normal purchase and normal sales exception to derivative accounting. Changes in the fair value of these commodity derivatives are recognized in the Consolidated Statements of Income. To support our Choice Gas Program customers, we buy, sell and deliver natural gas at competitive prices by managing commodity price risk. As a result of these activities, this area of our business is exposed to risks associated with changes in the market price of natural gas. We manage our exposure to such risks using over-the-counter and exchange traded options and swaps with counterparties in anticipation of forecasted purchases and sales during time frames ranging from July 2023 through October 2025. A portion of our over-the-counter swaps have been designated as cash flow hedges to mitigate the commodity price risk associated with deliveries under fixed price forward contracts to deliver gas to our Choice Gas Program customers. The gain or loss on these designated derivatives is reported in AOCI in the accompanying Consolidated Balance Sheets and reclassified into earnings in the same period that the underlying hedged item is recognized in earnings. Effectiveness of our hedging position is evaluated at least quarterly. The contract or notional amounts and terms of the electric and natural gas derivative commodity instruments held at our Utilities are composed of both long and short positions. We had the following net long positions as of: June 30, 2023 December 31, 2022 Notional Amounts (MMBtus) Maximum Term (months) (a) Notional Amounts (MMBtus) Maximum Term (months) (a) Natural gas futures purchased 80,000 8 630,000 3 Natural gas options purchased, net 120,000 9 1,790,000 3 Natural gas basis swaps purchased 80,000 8 900,000 3 Natural gas over-the-counter swaps, net (b) 6,580,000 27 4,460,000 24 Natural gas physical contracts, net (c) 1,813,165 9 17,864,412 12 (a) Term reflects the maximum forward period hedged. (b) As of June 30, 2023 , 3,151,300 MMBtus of natural gas over-the-counter swaps purchases were designated as cash flow hedges. (c) Volumes exclude derivative contracts that qualify for the normal purchases and normal sales exception permitted by GAAP. We have certain derivative contracts which contain credit provisions. These credit provisions may require the Company to post collateral when credit exposure to the Company is in excess of a negotiated line of unsecured credit. At June 30, 2023, the Company post ed $ 0.6 million re lated to such provisions, which is included in Other current assets on the Consolidated Balance Sheets. Derivatives by Balance Sheet Classification As required by accounting standards for derivatives and hedges, fair values within the following tables are presented on a gross basis aside from the netting of asset and liability positions. Netting of positions is permitted in accordance with accounting standards for offsetting and under terms of our master netting agreements that allow us to settle positive and negative positions. The following table presents the fair value and balance sheet classification of our derivative instruments (in thousands) as of: Balance Sheet Location June 30, December 31, Derivatives designated as hedges: Asset derivative instruments: Current commodity derivatives Derivative assets, current $ 408 $ 118 Noncurrent commodity derivatives Other assets, non-current - 198 Liability derivative instruments: Current commodity derivatives Derivative liabilities, current - ( 1,703 ) Noncurrent commodity derivatives Other assets, non-current ( 64 ) - Total derivatives designated as hedges $ 344 $ ( 1,387 ) Derivatives not designated as hedges: Asset derivative instruments: Current commodity derivatives Derivative assets, current $ ( 105 ) $ 464 Noncurrent commodity derivatives Other assets, non-current - 337 Liability derivative instruments: Current commodity derivatives Derivative liabilities, current ( 322 ) ( 4,897 ) Noncurrent commodity derivatives Other deferred credits and other liabilities ( 84 ) ( 18 ) Total derivatives not designated as hedges $ ( 511 ) $ ( 4,114 ) Derivatives Designated as Hedge Instruments The impacts of cash flow hedges on our Consolidated Statements of Comprehensive Income and Consolidated Statements of Income are presented below for the three and six months ended June 30, 2023 and 2022. Note that this presentation does not reflect the gains or losses arising from the underlying physical transactions; therefore, it is not indicative of the economic profit or loss we realized when the underlying physical and financial transactions were settled. Three Months Ended Three Months Ended 2023 2022 2023 2022 Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI Income Statement Location Amount of Gain/(Loss) Reclassified from AOCI into Income (in thousands) (in thousands) Interest rate swaps $ 713 $ 713 Interest expense $ ( 713 ) $ ( 713 ) Commodity derivatives 636 ( 4,371 ) Fuel, purchased power and cost of natural gas sold ( 489 ) 1,323 Total $ 1,349 $ ( 3,658 ) $ ( 1,202 ) $ 610 Six Months Ended Six Months Ended 2023 2022 2023 2022 Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI Income Statement Location Amount of Gain/(Loss) Reclassified from AOCI into Income (in thousands) (in thousands) Interest rate swaps $ 1,426 $ 1,426 I nterest expense $ ( 1,426 ) $ ( 1,426 ) Commodity derivatives 1,463 ( 5,238 ) Fuel, purchased power and cost of natural gas sold ( 2,439 ) 3,577 Total $ 2,889 $ ( 3,812 ) $ ( 3,865 ) $ 2,151 As of June 30, 2023, $ 2.9 million of net losses related to our interest rate swaps and commodity derivatives are expected to be reclassified from AOCI into earnings within the next 12 months. As market prices fluctuate, estimated and actual realized gains or losses will change during future periods. Derivatives Not Designated as Hedge Instruments The following table summarizes the impacts of derivative instruments not designated as hedge instruments on our Consolidated Statements of Income for the three and six months ended June 30, 2023 and 2022. Note that this presentation does not reflect the expected gains or losses arising from the underlying physical transactions; therefore, it is not indicative of the economic profit or loss we realized when the underlying physical and financial transactions were settled. Three Months Ended June 30, 2023 2022 Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) on Derivatives Recognized in Income Amount of Gain/(Loss) on Derivatives Recognized in Income Commodity derivatives Fuel, purchased power and cost of natural gas sold $ 394 $ ( 2,332 ) $ 394 $ ( 2,332 ) Six Months Ended June 30, 2023 2022 Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) on Derivatives Recognized in Income Amount of Gain/(Loss) on Derivatives Recognized in Income Commodity derivatives Fuel, purchased power and cost of natural gas sold $ ( 2,700 ) $ 1,162 $ ( 2,700 ) $ 1,162 As discussed above, financial instruments used in our regulated Gas Utilities are not designated as cash flow hedges. However, there is no earnings impact because the unrealized gains and losses arising from the use of these financial instruments are recorded as Regulatory assets or Regulatory liabilities. The net unrealized gains included in our Regulatory liability accounts related to these financial instruments in our Gas Utilities were $ 0.1 million as of June 30, 2023 . The net unrealized losses included in our Regulatory asset accounts related to these financial instruments were $ 8.8 million as of December 31, 2022 . For our Electric Utilities, the unrealized gains and losses arising from these derivatives are recognized in the Consolidated Statements of Income.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	(8) Fair Value Measurements We use the following fair value hierarchy for determining inputs for our financial instruments. Our assets and liabilities for financial instruments are classified and disclosed in one of the following fair value categories: Level 1 — Unadjusted quoted prices available in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities. Level 1 instruments primarily consist of highly liquid and actively traded financial instruments with quoted pricing information on an ongoing basis. Level 2 — Pricing inputs include quoted prices for identical or similar assets and liabilities in active markets other than quoted prices in Level 1, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 — Pricing inputs are generally less observable from objective sources. These inputs reflect management’s best estimate of fair value using its own assumptions about the assumptions a market participant would use in pricing the asset or liability. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement within the fair value hierarchy levels. We record transfers, if necessary, between levels at the end of the reporting period for all of our financial instruments. Transfers into Level 3, if any, occur when significant inputs used to value the derivative instruments become less observable, such as a significant decrease in the frequency and volume in which the instrument is traded, negatively impacting the availability of observable pricing inputs. Transfers out of Level 3, if any, occur when the significant inputs become more observable, such as when the time between the valuation date and the delivery date of a transaction becomes shorter, positively impacting the availability of observable pricing inputs. Recurring Fair Value Measurements Derivatives The commodity contracts for our Utilities segments are valued using the market approach and include forward strip pricing at liquid delivery points, exchange-traded futures, options, basis swaps and over-the-counter swaps and options (Level 2) for wholesale electric energy and natural gas contracts. For exchange-traded futures, options and basis swap assets and liabilities, fair value was derived using broker quotes validated by the exchange settlement pricing for the applicable contract. For over-the-counter instruments, the fair value is obtained by utilizing a nationally recognized service that obtains observable inputs to compute the fair value, which we validate by comparing our valuation with the counterparty. The fair value of these swaps includes a credit valuation adjustment based on the credit spreads of the counterparties when we are in an unrealized gain position or on our own credit spread when we are in an unrealized loss position. For additional information, see Note 1 of our Notes to the Consolidated Financial Statements in our 2022 Annual Report on Form 10-K. The following tables set forth, by level within the fair value hierarchy, our gross assets and gross liabilities and related offsetting of cash collateral and contractual netting rights as permitted by GAAP that were accounted for at fair value on a recurring basis for derivative instruments. As of June 30, 2023 Level 1 Level 2 Level 3 Cash Collateral and Counterparty Netting (a) Total (in thousands) Assets: Commodity derivatives - Gas Utilities $ - $ 1,054 $ - $ ( 751 ) $ 303 Total $ - $ 1,054 $ - $ ( 751 ) $ 303 Liabilities: Commodity derivatives - Gas Utilities $ - $ 495 $ - $ ( 25 ) $ 470 Total $ - $ 495 $ - $ ( 25 ) $ 470 (a) As of June 30, 2023, $ 0.8 million of our commodity derivative assets and no ne of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements . As of December 31, 2022 Level 1 Level 2 Level 3 Cash Collateral and Counterparty Netting (a) Total (in thousands) Assets: Commodity derivatives - Gas Utilities $ - $ 5,407 $ - $ ( 4,290 ) $ 1,117 Total $ - $ 5,407 $ - $ ( 4,290 ) $ 1,117 Liabilities: Commodity derivatives - Gas Utilities $ - $ 11,455 $ - $ ( 4,837 ) $ 6,618 Total $ - $ 11,455 $ - $ ( 4,837 ) $ 6,618 (a) As of December 31, 2022 , $ 4.3 million of our commodity derivative assets and $ 4.8 million of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements. Pension and Postretirement Plan Assets Fair value measurements also apply to the valuation of our pension and postretirement plan assets. Current accounting guidance requires employers to annually disclose information about the fair value measurements of their assets of a defined benefit pension or other postretirement plan. The fair value of these assets is presented in Note 13 to the Consolidated Financial Statements included in our 2022 Annual Report on Form 10-K. Other Fair Value Measures The carrying amount of cash and cash equivalents, restricted cash and equivalents and short-term borrowings approximates fair value due to their liquid or short-term nature. Cash, cash equivalents and restricted cash are classified in Level 1 in the fair value hierarchy. Notes payable consist of commercial paper borrowings and are not traded on an exchange; therefore, they are classified as Level 2 in the fair value hierarchy. The following table presents the carrying amounts and fair values of financial instruments not recorded at fair value on the Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt, including current maturities (a) $ 4,480,745 $ 4,152,130 $ 4,132,340 $ 3,760,848 (a) Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified in Level 2 in the fair value hierarchy. Carrying amount of long-term debt is net of deferred financing costs.

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income	(9) Other Comprehensive Income We record deferred gains (losses) in AOCI related to interest rate swaps designated as cash flow hedges, commodity contracts designated as cash flow hedges and the amortization of components of our defined benefit plans. Deferred gains (losses) for our commodity contracts designated as cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate swaps are recognized in earnings as they are amortized. The following table details reclassifications out of AOCI and into Net income. The amounts in parentheses below indicate decreases to Net income in the Consolidated Statements of Income for the period, net of tax (in thousands): Amount Reclassified from AOCI Amount Reclassified from AOCI Location on the Consolidated Statements of Income Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Gains and (losses) on cash flow hedges: Interest rate swaps Interest expense $ ( 713 ) $ ( 713 ) $ ( 1,426 ) $ ( 1,426 ) Commodity contracts Fuel, purchased power and cost of natural gas sold ( 489 ) 1,323 ( 2,439 ) 3,577 $ ( 1,202 ) $ 610 $ ( 3,865 ) $ 2,151 Income tax Income tax expense 295 ( 81 ) 911 ( 456 ) Total reclassification adjustments related to cash flow hedges, net of tax $ ( 907 ) $ 529 $ ( 2,954 ) $ 1,695 Amortization of components of defined benefit plans: Prior service cost Operations and maintenance $ - $ 22 $ - $ 46 Actuarial gain (loss) Operations and maintenance ( 43 ) ( 187 ) ( 87 ) ( 375 ) $ ( 43 ) $ ( 165 ) $ ( 87 ) $ ( 329 ) Income tax Income tax expense 27 60 43 99 Total reclassification adjustments related to defined benefit plans, net of tax $ ( 16 ) $ ( 105 ) $ ( 44 ) $ ( 230 ) Total reclassifications $ ( 923 ) $ 424 $ ( 2,998 ) $ 1,465 Balances by classification included within AOCI, net of tax on the accompanying Consolidated Balance Sheets were as follows (in thousands): Derivatives Designated as Cash Flow Hedges Interest Rate Swaps Commodity Derivatives Employee Benefit Plans Total As of December 31, 2022 $ ( 8,255 ) $ ( 1,200 ) $ ( 6,112 ) $ ( 15,567 ) Other comprehensive income (loss) before reclassifications - ( 743 ) - ( 743 ) Amounts reclassified from AOCI 1,099 1,855 44 2,998 As of June 30, 2023 $ ( 7,156 ) $ ( 88 ) $ ( 6,068 ) $ ( 13,312 ) Derivatives Designated as Cash Flow Hedges Interest Rate Swaps Commodity Derivatives Employee Benefit Plans Total As of December 31, 2021 $ ( 10,384 ) $ 1,476 $ ( 11,176 ) $ ( 20,084 ) Other comprehensive income (loss) before reclassifications - ( 1,267 ) - ( 1,267 ) Amounts reclassified from AOCI 1,011 ( 2,706 ) 230 ( 1,465 ) As of June 30, 2022 $ ( 9,373 ) $ ( 2,497 ) $ ( 10,946 ) $ ( 22,816 )

Employee Benefits Plans

Employee Benefits Plans	6 Months Ended
	Jun. 30, 2023
Retirement Benefits [Abstract]
Employee Benefit Plans	(10) Employee Benefit Plans Components of Net Periodic Expense The components of net periodic expense were as follows (in thousands): Defined Benefit Pension Plan Supplemental Non-qualified Defined Benefit Plans Non-pension Defined Benefit Postretirement Healthcare Plan Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Service cost $ 614 $ 982 $ 770 $ ( 1,355 ) $ 381 $ 492 Interest cost 4,381 2,704 369 209 594 321 Expected return on plan assets ( 4,672 ) ( 4,630 ) - - ( 55 ) ( 31 ) Net amortization of prior service costs ( 17 ) ( 17 ) - - 10 ( 73 ) Recognized net actuarial loss 498 1,523 8 69 ( 3 ) 16 Net periodic expense (benefit) $ 804 $ 562 $ 1,147 $ ( 1,077 ) $ 927 $ 725 Defined Benefit Pension Plan Supplemental Non-qualified Defined Benefit Plans Non-pension Defined Benefit Postretirement Healthcare Plan Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Service cost $ 1,228 $ 1,964 $ 1,684 $ ( 1,747 ) $ 762 $ 984 Interest cost 8,761 5,409 738 417 1,188 642 Expected return on plan assets ( 9,344 ) ( 9,261 ) - - ( 111 ) ( 62 ) Net amortization of prior service costs ( 34 ) ( 34 ) - - 20 ( 145 ) Recognized net actuarial loss (gain) 996 3,046 16 138 ( 6 ) 32 Net periodic expense (benefit) $ 1,607 $ 1,124 $ 2,438 $ ( 1,192 ) $ 1,853 $ 1,451 Plan Contributions Contributions to the Defined Benefit Pension Plan are cash contributions made directly to the Pension Plan Trust account. Contributions to the Postretirement Healthcare and Supplemental Plans are made in the form of benefit payments. Contributions made in the first six months of 2023 and anticipated contributions for 2023 and 2024 are as follows (in thousands): Contributions Made Additional Contributions Contributions Six Months Ended June 30, 2023 Anticipated for Anticipated for Defined Benefit Pension Plan $ - $ - $ - Non-pension Defined Benefit Postretirement Healthcare Plan $ 2,460 $ 2,460 $ 4,808 Supplemental Non-qualified Defined Benefit and Defined Contribution Plans $ 1,116 $ 1,116 $ 2,417

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	(11) Income Taxes IRS Revenue Procedure 2023-15 On April 14, 2023, the IRS released Revenue Procedure 2023-15 “Amounts paid to improve tangible property.” The Revenue Procedure provides a safe harbor method of accounting that taxpayers may use to determine whether expenses to repair, maintain, replace, or improve natural gas transmission and distribution property must be capitalized. We are currently assessing the Revenue Procedure to determine its impact on our tax repairs deduction. Income Tax Benefit (Expense) and Effective Tax Rates Three Months Ended June 30, 2023 Compared to the Three Months Ended June 30, 2022 Income tax benefit for the three months ended June 30, 2023 was $ 6.1 million compared to $ 0.7 million reported for the same period in 2022. For the three months ended June 30, 2023, the effective tax rate was ( 29.8 )% compared to ( 1.9 )% for the same period in 2022 . The lower effective tax rate was primarily due to a $ 8.2 million tax benefit from a Nebraska income tax rate decrease compared to a $ 3.8 million benefit from a similar Nebraska tax rate decrease in 2022 and $ 2.3 million of lower wind PTCs driven by the March 2023 sale of Northern Iowa Windpower assets. Six Months Ended June 30, 2023 Compared to the Six Months Ended June 30, 2022 Income tax (expense) for the six months ended June 30, 2023 was $( 8.6 ) million compared to $( 13.8 ) million reported for the same period in 2022. For the six months ended June 30, 2023, the effective tax rate was 5.6 % compared to 8.1 % for the same period in 2022 . The lower effective tax rate was primarily due to a $ 8.2 million tax benefit from a Nebraska income tax rate decrease compared to a $ 3.8 million benefit from a similar Nebraska tax rate decrease in 2022 and $ 3.0 million of lower wind PTCs driven by the March 2023 sale of Northern Iowa Windpower assets.

Business Segment Information

Business Segment Information	6 Months Ended
	Jun. 30, 2023
Segment Reporting Information, Additional Information [Abstract]
Business Segment Information	(12) Business Segment Information Our Chief Executive Officer, who is considered to be our CODM, reviews financial information presented on an operating segment basis for purposes of making decisions, allocating resources and assessing financial performance. Our CODM assesses the performance of our operating segments based on operating income. We conduct our business operations through two operating segments: Electric Utilities and Gas Utilities. Certain unallocated corporate expenses that support our operating segments are presented as Corporate and Other. Our operating segments are equivalent to our reportable segments. Segment information was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Revenues: Electric Utilities External Customers $ 190,212 $ 201,450 $ 406,105 $ 405,059 Inter-segment 2,861 2,929 5,677 5,858 Total Electric Utilities Revenue 193,073 204,379 411,782 410,917 Gas Utilities External Customers 221,071 272,745 926,337 892,706 Inter-segment 1,649 1,424 3,299 2,855 Total Gas Utilities Revenue 222,720 274,169 929,636 895,561 Inter-segment eliminations ( 4,510 ) ( 4,353 ) ( 8,976 ) ( 8,713 ) Total Revenues $ 411,283 $ 474,195 $ 1,332,442 $ 1,297,765 Operating income (loss): Electric Utilities $ 46,619 $ 45,226 $ 107,679 $ 95,972 Gas Utilities 17,725 28,195 132,350 151,735 Corporate and Other ( 828 ) ( 1,032 ) ( 1,630 ) ( 1,965 ) Total Operating Income $ 63,516 $ 72,389 $ 238,399 $ 245,742 Total assets (net of inter-segment eliminations) as of: June 30, 2023 December 31, 2022 Electric Utilities $ 3,914,037 $ 3,929,721 Gas Utilities 5,252,521 5,578,282 Corporate and Other 242,537 110,227 Total assets $ 9,409,095 $ 9,618,230

Selected Balance Sheet Informat

Selected Balance Sheet Information	6 Months Ended
	Jun. 30, 2023
Selected Balance Sheet Information [Abstract]
Selected Balance Sheet Information	(13) Selected Balance Sheet Information Accounts Receivable and Allowance for Credit Losses Following is a summary of Accounts receivable, net included in the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Billed Accounts Receivable $ 192,444 $ 267,571 Unbilled Revenue 71,097 243,574 Less: Allowance for Credit Losses ( 3,191 ) ( 2,953 ) Account Receivable, net $ 260,350 $ 508,192 Changes to allowance for credit losses for the six months ended June 30, 2023 and 2022, respectively, were as follows (in thousands): Balance at Beginning of Year Additions Charged to Costs and Expenses Recoveries and Other Additions Write-offs and Other Deductions Balance at June 30, 2023 $ 2,953 $ 4,278 $ 1,444 $ ( 5,484 ) $ 3,191 2022 $ 2,113 $ 4,239 $ 1,266 $ ( 4,425 ) $ 3,193 Materials, Supplies and Fuel The following amounts by major classification are included in Materials, supplies and fuel on the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Materials and supplies $ 101,854 $ 99,734 Fuel - Electric Utilities 7,757 3,115 Natural gas in storage 26,923 104,572 Total materials, supplies and fuel $ 136,534 $ 207,421 Accrued Liabilities The following amounts by major classification are included in Accrued liabilities on the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Accrued employee compensation, benefits and withholdings $ 62,031 $ 62,890 Accrued property taxes 40,298 52,430 Customer deposits and prepayments 42,730 47,655 Accrued interest 40,715 33,798 Other (none of which is individually significant) 31,485 46,684 Total accrued liabilities $ 217,259 $ 243,457

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	(14) Subsequent Events Except as described in Notes 2 and 5 , there have been no events subsequent to June 30, 2023, which would require recognition in the consolidated financial statements or disclosures.

Management's Statement (Policie

Management's Statement (Policies)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates and Basis of Presentation	Use of Estimates and Basis of Presentation The information furnished in the accompanying Consolidated Financial Statements reflects certain estimates required and all adjustments, including accruals, which are, in the opinion of management, necessary for a fair presentation of the June 30, 2023, December 31, 2022 and June 30, 2022 financial information. Certain lines of business in which we operate are highly seasonal, and our interim results of operations are not necessarily indicative of the results of operations to be expected for an entire year.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2023
Regulated Operations [Abstract]
Schedule of Regulatory Assets and Liabilities	We had the following regulatory assets and liabilities (in thousands): As of As of June 30, 2023 December 31, 2022 Regulatory assets Winter Storm Uri $ 233,299 $ 347,980 Deferred energy and fuel cost adjustments 68,708 72,580 Deferred gas cost adjustments 8,777 12,147 Gas price derivatives - 8,793 Deferred taxes on AFUDC 7,305 7,333 Employee benefit plans and related deferred taxes 88,203 89,259 Environmental 1,346 1,343 Loss on reacquired debt 18,315 19,213 Deferred taxes on flow through accounting 74,165 69,529 Decommissioning costs 2,406 3,472 Other regulatory assets 21,147 21,332 Total regulatory assets 523,671 652,981 Less current regulatory assets ( 198,443 ) ( 260,312 ) Regulatory assets, non-current $ 325,228 $ 392,669 Regulatory liabilities Deferred energy and gas costs $ 99,649 $ 41,722 Employee benefit plan costs and related deferred taxes 33,065 34,258 Cost of removal 178,668 175,614 Excess deferred income taxes 250,728 254,833 Other regulatory liabilities 9,378 12,146 Total regulatory liabilities 571,488 518,573 Less current regulatory liabilities ( 101,979 ) ( 46,013 ) Regulatory liabilities, non-current $ 469,509 $ 472,560

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reportable segments for the three and six months ended June 30, 2023 and 2022. Sales tax and other similar taxes are excluded from revenues. Three Months Ended June 30, 2023 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: Retail $ 156,372 $ 174,781 $ - $ 331,153 Transportation - 35,913 ( 115 ) 35,798 Wholesale 5,739 - - 5,739 Market - off-system sales 8,364 43 - 8,407 Transmission/Other 19,231 9,203 ( 4,395 ) 24,039 Revenue from contracts with customers $ 189,706 $ 219,940 $ ( 4,510 ) $ 405,136 Other revenues 3,367 2,780 - 6,147 Total revenues $ 193,073 $ 222,720 $ ( 4,510 ) $ 411,283 Timing of revenue recognition: Services transferred at a point in time $ 7,844 $ - $ - $ 7,844 Services transferred over time 181,862 219,940 ( 4,510 ) 397,292 Revenue from contracts with customers $ 189,706 $ 219,940 $ ( 4,510 ) $ 405,136 Three Months Ended June 30, 2022 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: Retail $ 169,032 $ 229,074 $ - $ 398,106 Transportation - 34,667 ( 100 ) 34,567 Wholesale 8,428 - - 8,428 Market - off-system sales 8,666 178 - 8,844 Transmission/Other 15,183 9,344 ( 4,148 ) 20,379 Revenue from contracts with customers $ 201,309 $ 273,263 $ ( 4,248 ) $ 470,324 Other revenues 3,070 906 ( 105 ) 3,871 Total revenues $ 204,379 $ 274,169 $ ( 4,353 ) $ 474,195 Timing of revenue recognition: Services transferred at a point in time $ 6,671 $ - $ - $ 6,671 Services transferred over time 194,638 273,263 ( 4,248 ) 463,653 Revenue from contracts with customers $ 201,309 $ 273,263 $ ( 4,248 ) $ 470,324 Six Months Ended June 30, 2023 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: (in thousands) Retail $ 331,275 $ 810,326 $ - $ 1,141,601 Transportation - 88,756 ( 230 ) 88,526 Wholesale 15,137 - - 15,137 Market - off-system sales 24,488 324 - 24,812 Transmission/Other 36,635 19,226 ( 8,746 ) 47,115 Revenue from contracts with customers $ 407,535 $ 918,632 $ ( 8,976 ) $ 1,317,191 Other revenues 4,247 11,004 - 15,251 Total revenues $ 411,782 $ 929,636 $ ( 8,976 ) $ 1,332,442 Timing of revenue recognition: Services transferred at a point in time $ 16,501 $ - $ - $ 16,501 Services transferred over time 391,034 918,632 ( 8,976 ) 1,300,690 Revenue from contracts with customers $ 407,535 $ 918,632 $ ( 8,976 ) $ 1,317,191 Six Months Ended June 30, 2022 Electric Utilities Gas Utilities Inter-segment Revenues Total Customer types: (in thousands) Retail $ 341,838 $ 790,087 $ - $ 1,131,925 Transportation - 84,190 ( 199 ) 83,991 Wholesale 18,703 - - 18,703 Market - off-system sales 15,820 416 - 16,236 Transmission/Other 30,616 18,919 ( 8,297 ) 41,238 Revenue from contracts with customers $ 406,977 $ 893,612 $ ( 8,496 ) $ 1,292,093 Other revenues 3,940 1,949 ( 217 ) 5,672 Total revenues $ 410,917 $ 895,561 $ ( 8,713 ) $ 1,297,765 Timing of revenue recognition: Services transferred at a point in time $ 13,784 $ - $ - $ 13,784 Services transferred over time 393,193 893,612 ( 8,496 ) 1,278,309 Revenue from contracts with customers $ 406,977 $ 893,612 $ ( 8,496 ) $ 1,292,093

Financing (Tables)

Financing (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Short-term Debt	Our Revolving Credit Facility and CP Program, which are classified as Notes payable on the Consolidated Balance Sheets, had the following borrowings, outstanding letters of credit, and available capacity (dollars in thousands) as of: June 30, 2023 December 31, 2022 Amount outstanding $ — $ 535,600 Letters of credit (a) $ 2,751 $ 24,626 Available capacity $ 747,249 $ 189,774 Weighted average interest rates N/A 4.88 % (a) Letters of credit are off-balance sheet commitments that reduce the borrowing capacity available on our corporate Revolving Credit Facility . Revolving Credit Facility and CP Program borrowing activity was as follows (dollars in thousands): Six Months Ended June 30, 2023 2022 Maximum amount outstanding (based on daily outstanding balances) $ 548,700 $ 429,000 Average amount outstanding (based on daily outstanding balances) $ 164,719 $ 326,172 Weighted average interest rates 4.91 % 0.82 %
Summary of ATM Activity	ATM activity was as follows (net proceeds and issuance costs in millions): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 August 4, 2020 ATM Program Proceeds, (net of issuance costs of $( 0.2 ), $( 0.2 ), $( 0.5 ) and $( 0.2 ), respectively) $ 21.0 $ 16.4 $ 48.5 $ 20.2 Number of shares issued 329,647 216,885 775,225 272,592 June 16, 2023 ATM Program Proceeds, (net of issuance costs of $( 0.1 ), $ 0 , $( 0.1 ) and $ 0 , respectively) $ 6.4 $ - $ 6.4 $ - Number of shares issued 106,555 - 106,555 - Total activity under both ATM Programs Proceeds, (net of issuance costs of $( 0.3 ), $( 0.2 ), $( 0.6 ) and $( 0.2 ), respectively) $ 27.4 $ 16.4 $ 54.9 $ 20.2 Number of shares issued 436,202 216,885 881,780 272,592 Average price per share $ 63.53 $ 76.39 $ 62.86 $ 74.84

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	A reconciliation of share amounts used to compute earnings per share in the accompanying Consolidated Statements of Income was as follows (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net income available for common stock $ 23,053 $ 33,415 $ 137,137 $ 150,941 Weighted average shares - basic 66,591 64,721 66,315 64,643 Dilutive effect of: Equity compensation 93 162 104 179 Weighted average shares - diluted 66,684 64,883 66,419 64,822 Earnings per share of common stock: Earnings per share, Basic $ 0.35 $ 0.52 $ 2.07 $ 2.33 Earnings per share, Diluted $ 0.35 $ 0.52 $ 2.06 $ 2.33
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following securities were excluded from the diluted earnings per share computation because of their anti-dilutive nature (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Equity compensation 76 - 47 - Restricted stock 1 - - 1 Anti-dilutive shares 77 - 47 1

Risk Management And Derivativ_2

Risk Management And Derivatives (Tables)	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Contract or notional amounts and terms of marketing activities and derivative commodity instruments	The contract or notional amounts and terms of the electric and natural gas derivative commodity instruments held at our Utilities are composed of both long and short positions. We had the following net long positions as of: June 30, 2023 December 31, 2022 Notional Amounts (MMBtus) Maximum Term (months) (a) Notional Amounts (MMBtus) Maximum Term (months) (a) Natural gas futures purchased 80,000 8 630,000 3 Natural gas options purchased, net 120,000 9 1,790,000 3 Natural gas basis swaps purchased 80,000 8 900,000 3 Natural gas over-the-counter swaps, net (b) 6,580,000 27 4,460,000 24 Natural gas physical contracts, net (c) 1,813,165 9 17,864,412 12 (a) Term reflects the maximum forward period hedged. (b) As of June 30, 2023 , 3,151,300 MMBtus of natural gas over-the-counter swaps purchases were designated as cash flow hedges. (c) Volumes exclude derivative contracts that qualify for the normal purchases and normal sales exception permitted by GAAP.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value and balance sheet classification of our derivative instruments (in thousands) as of: Balance Sheet Location June 30, December 31, Derivatives designated as hedges: Asset derivative instruments: Current commodity derivatives Derivative assets, current $ 408 $ 118 Noncurrent commodity derivatives Other assets, non-current - 198 Liability derivative instruments: Current commodity derivatives Derivative liabilities, current - ( 1,703 ) Noncurrent commodity derivatives Other assets, non-current ( 64 ) - Total derivatives designated as hedges $ 344 $ ( 1,387 ) Derivatives not designated as hedges: Asset derivative instruments: Current commodity derivatives Derivative assets, current $ ( 105 ) $ 464 Noncurrent commodity derivatives Other assets, non-current - 337 Liability derivative instruments: Current commodity derivatives Derivative liabilities, current ( 322 ) ( 4,897 ) Noncurrent commodity derivatives Other deferred credits and other liabilities ( 84 ) ( 18 ) Total derivatives not designated as hedges $ ( 511 ) $ ( 4,114 )
Derivative Instruments, Gain (Loss)	The impacts of cash flow hedges on our Consolidated Statements of Comprehensive Income and Consolidated Statements of Income are presented below for the three and six months ended June 30, 2023 and 2022. Note that this presentation does not reflect the gains or losses arising from the underlying physical transactions; therefore, it is not indicative of the economic profit or loss we realized when the underlying physical and financial transactions were settled. Three Months Ended Three Months Ended 2023 2022 2023 2022 Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI Income Statement Location Amount of Gain/(Loss) Reclassified from AOCI into Income (in thousands) (in thousands) Interest rate swaps $ 713 $ 713 Interest expense $ ( 713 ) $ ( 713 ) Commodity derivatives 636 ( 4,371 ) Fuel, purchased power and cost of natural gas sold ( 489 ) 1,323 Total $ 1,349 $ ( 3,658 ) $ ( 1,202 ) $ 610 Six Months Ended Six Months Ended 2023 2022 2023 2022 Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI Income Statement Location Amount of Gain/(Loss) Reclassified from AOCI into Income (in thousands) (in thousands) Interest rate swaps $ 1,426 $ 1,426 I nterest expense $ ( 1,426 ) $ ( 1,426 ) Commodity derivatives 1,463 ( 5,238 ) Fuel, purchased power and cost of natural gas sold ( 2,439 ) 3,577 Total $ 2,889 $ ( 3,812 ) $ ( 3,865 ) $ 2,151 As of June 30, 2023, $ 2.9 million of net losses related to our interest rate swaps and commodity derivatives are expected to be reclassified from AOCI into earnings within the next 12 months. As market prices fluctuate, estimated and actual realized gains or losses will change during future periods. Derivatives Not Designated as Hedge Instruments The following table summarizes the impacts of derivative instruments not designated as hedge instruments on our Consolidated Statements of Income for the three and six months ended June 30, 2023 and 2022. Note that this presentation does not reflect the expected gains or losses arising from the underlying physical transactions; therefore, it is not indicative of the economic profit or loss we realized when the underlying physical and financial transactions were settled. Three Months Ended June 30, 2023 2022 Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) on Derivatives Recognized in Income Amount of Gain/(Loss) on Derivatives Recognized in Income Commodity derivatives Fuel, purchased power and cost of natural gas sold $ 394 $ ( 2,332 ) $ 394 $ ( 2,332 ) Six Months Ended June 30, 2023 2022 Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) on Derivatives Recognized in Income Amount of Gain/(Loss) on Derivatives Recognized in Income Commodity derivatives Fuel, purchased power and cost of natural gas sold $ ( 2,700 ) $ 1,162 $ ( 2,700 ) $ 1,162

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value Hierarchy, Measured on Recurring Basis	The following tables set forth, by level within the fair value hierarchy, our gross assets and gross liabilities and related offsetting of cash collateral and contractual netting rights as permitted by GAAP that were accounted for at fair value on a recurring basis for derivative instruments. As of June 30, 2023 Level 1 Level 2 Level 3 Cash Collateral and Counterparty Netting (a) Total (in thousands) Assets: Commodity derivatives - Gas Utilities $ - $ 1,054 $ - $ ( 751 ) $ 303 Total $ - $ 1,054 $ - $ ( 751 ) $ 303 Liabilities: Commodity derivatives - Gas Utilities $ - $ 495 $ - $ ( 25 ) $ 470 Total $ - $ 495 $ - $ ( 25 ) $ 470 (a) As of June 30, 2023, $ 0.8 million of our commodity derivative assets and no ne of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements . As of December 31, 2022 Level 1 Level 2 Level 3 Cash Collateral and Counterparty Netting (a) Total (in thousands) Assets: Commodity derivatives - Gas Utilities $ - $ 5,407 $ - $ ( 4,290 ) $ 1,117 Total $ - $ 5,407 $ - $ ( 4,290 ) $ 1,117 Liabilities: Commodity derivatives - Gas Utilities $ - $ 11,455 $ - $ ( 4,837 ) $ 6,618 Total $ - $ 11,455 $ - $ ( 4,837 ) $ 6,618 (a) As of December 31, 2022 , $ 4.3 million of our commodity derivative assets and $ 4.8 million of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements.
Fair Value, by Balance Sheet Grouping	The following table presents the carrying amounts and fair values of financial instruments not recorded at fair value on the Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt, including current maturities (a) $ 4,480,745 $ 4,152,130 $ 4,132,340 $ 3,760,848 (a) Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified in Level 2 in the fair value hierarchy. Carrying amount of long-term debt is net of deferred financing costs.

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Reclassification out of Accumulated Other Comprehensive Income	The following table details reclassifications out of AOCI and into Net income. The amounts in parentheses below indicate decreases to Net income in the Consolidated Statements of Income for the period, net of tax (in thousands): Amount Reclassified from AOCI Amount Reclassified from AOCI Location on the Consolidated Statements of Income Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Gains and (losses) on cash flow hedges: Interest rate swaps Interest expense $ ( 713 ) $ ( 713 ) $ ( 1,426 ) $ ( 1,426 ) Commodity contracts Fuel, purchased power and cost of natural gas sold ( 489 ) 1,323 ( 2,439 ) 3,577 $ ( 1,202 ) $ 610 $ ( 3,865 ) $ 2,151 Income tax Income tax expense 295 ( 81 ) 911 ( 456 ) Total reclassification adjustments related to cash flow hedges, net of tax $ ( 907 ) $ 529 $ ( 2,954 ) $ 1,695 Amortization of components of defined benefit plans: Prior service cost Operations and maintenance $ - $ 22 $ - $ 46 Actuarial gain (loss) Operations and maintenance ( 43 ) ( 187 ) ( 87 ) ( 375 ) $ ( 43 ) $ ( 165 ) $ ( 87 ) $ ( 329 ) Income tax Income tax expense 27 60 43 99 Total reclassification adjustments related to defined benefit plans, net of tax $ ( 16 ) $ ( 105 ) $ ( 44 ) $ ( 230 ) Total reclassifications $ ( 923 ) $ 424 $ ( 2,998 ) $ 1,465
Schedule of Accumulated Other Comprehensive Income (Loss)	Balances by classification included within AOCI, net of tax on the accompanying Consolidated Balance Sheets were as follows (in thousands): Derivatives Designated as Cash Flow Hedges Interest Rate Swaps Commodity Derivatives Employee Benefit Plans Total As of December 31, 2022 $ ( 8,255 ) $ ( 1,200 ) $ ( 6,112 ) $ ( 15,567 ) Other comprehensive income (loss) before reclassifications - ( 743 ) - ( 743 ) Amounts reclassified from AOCI 1,099 1,855 44 2,998 As of June 30, 2023 $ ( 7,156 ) $ ( 88 ) $ ( 6,068 ) $ ( 13,312 ) Derivatives Designated as Cash Flow Hedges Interest Rate Swaps Commodity Derivatives Employee Benefit Plans Total As of December 31, 2021 $ ( 10,384 ) $ 1,476 $ ( 11,176 ) $ ( 20,084 ) Other comprehensive income (loss) before reclassifications - ( 1,267 ) - ( 1,267 ) Amounts reclassified from AOCI 1,011 ( 2,706 ) 230 ( 1,465 ) As of June 30, 2022 $ ( 9,373 ) $ ( 2,497 ) $ ( 10,946 ) $ ( 22,816 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Benefit Cost	The components of net periodic expense were as follows (in thousands): Defined Benefit Pension Plan Supplemental Non-qualified Defined Benefit Plans Non-pension Defined Benefit Postretirement Healthcare Plan Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Service cost $ 614 $ 982 $ 770 $ ( 1,355 ) $ 381 $ 492 Interest cost 4,381 2,704 369 209 594 321 Expected return on plan assets ( 4,672 ) ( 4,630 ) - - ( 55 ) ( 31 ) Net amortization of prior service costs ( 17 ) ( 17 ) - - 10 ( 73 ) Recognized net actuarial loss 498 1,523 8 69 ( 3 ) 16 Net periodic expense (benefit) $ 804 $ 562 $ 1,147 $ ( 1,077 ) $ 927 $ 725 Defined Benefit Pension Plan Supplemental Non-qualified Defined Benefit Plans Non-pension Defined Benefit Postretirement Healthcare Plan Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Service cost $ 1,228 $ 1,964 $ 1,684 $ ( 1,747 ) $ 762 $ 984 Interest cost 8,761 5,409 738 417 1,188 642 Expected return on plan assets ( 9,344 ) ( 9,261 ) - - ( 111 ) ( 62 ) Net amortization of prior service costs ( 34 ) ( 34 ) - - 20 ( 145 ) Recognized net actuarial loss (gain) 996 3,046 16 138 ( 6 ) 32 Net periodic expense (benefit) $ 1,607 $ 1,124 $ 2,438 $ ( 1,192 ) $ 1,853 $ 1,451
Schedule of Employer Contribution to Employee Benefit Plans	Contributions made in the first six months of 2023 and anticipated contributions for 2023 and 2024 are as follows (in thousands): Contributions Made Additional Contributions Contributions Six Months Ended June 30, 2023 Anticipated for Anticipated for Defined Benefit Pension Plan $ - $ - $ - Non-pension Defined Benefit Postretirement Healthcare Plan $ 2,460 $ 2,460 $ 4,808 Supplemental Non-qualified Defined Benefit and Defined Contribution Plans $ 1,116 $ 1,116 $ 2,417

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting Information, Additional Information [Abstract]
Schedule of Segment Reporting Information, by Segment	Segment information was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Revenues: Electric Utilities External Customers $ 190,212 $ 201,450 $ 406,105 $ 405,059 Inter-segment 2,861 2,929 5,677 5,858 Total Electric Utilities Revenue 193,073 204,379 411,782 410,917 Gas Utilities External Customers 221,071 272,745 926,337 892,706 Inter-segment 1,649 1,424 3,299 2,855 Total Gas Utilities Revenue 222,720 274,169 929,636 895,561 Inter-segment eliminations ( 4,510 ) ( 4,353 ) ( 8,976 ) ( 8,713 ) Total Revenues $ 411,283 $ 474,195 $ 1,332,442 $ 1,297,765 Operating income (loss): Electric Utilities $ 46,619 $ 45,226 $ 107,679 $ 95,972 Gas Utilities 17,725 28,195 132,350 151,735 Corporate and Other ( 828 ) ( 1,032 ) ( 1,630 ) ( 1,965 ) Total Operating Income $ 63,516 $ 72,389 $ 238,399 $ 245,742 Total assets (net of inter-segment eliminations) as of: June 30, 2023 December 31, 2022 Electric Utilities $ 3,914,037 $ 3,929,721 Gas Utilities 5,252,521 5,578,282 Corporate and Other 242,537 110,227 Total assets $ 9,409,095 $ 9,618,230

Selected Balance Sheet Inform_2

Selected Balance Sheet Information (Tables)	6 Months Ended
	Jun. 30, 2023
Selected Balance Sheet Information [Abstract]
Account Receivable Schedule	Following is a summary of Accounts receivable, net included in the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Billed Accounts Receivable $ 192,444 $ 267,571 Unbilled Revenue 71,097 243,574 Less: Allowance for Credit Losses ( 3,191 ) ( 2,953 ) Account Receivable, net $ 260,350 $ 508,192
Financing Receivable, Current, Allowance for Credit Loss	Changes to allowance for credit losses for the six months ended June 30, 2023 and 2022, respectively, were as follows (in thousands): Balance at Beginning of Year Additions Charged to Costs and Expenses Recoveries and Other Additions Write-offs and Other Deductions Balance at June 30, 2023 $ 2,953 $ 4,278 $ 1,444 $ ( 5,484 ) $ 3,191 2022 $ 2,113 $ 4,239 $ 1,266 $ ( 4,425 ) $ 3,193
Materials, Supplies and Fuel	The following amounts by major classification are included in Materials, supplies and fuel on the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Materials and supplies $ 101,854 $ 99,734 Fuel - Electric Utilities 7,757 3,115 Natural gas in storage 26,923 104,572 Total materials, supplies and fuel $ 136,534 $ 207,421
Schedule of Accrued Liabilities	The following amounts by major classification are included in Accrued liabilities on the accompanying Consolidated Balance Sheets (in thousands) as of: June 30, 2023 December 31, 2022 Accrued employee compensation, benefits and withholdings $ 62,031 $ 62,890 Accrued property taxes 40,298 52,430 Customer deposits and prepayments 42,730 47,655 Accrued interest 40,715 33,798 Other (none of which is individually significant) 31,485 46,684 Total accrued liabilities $ 217,259 $ 243,457

Regulatory Matters_ Regulatory

Regulatory Matters: Regulatory Matters (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Regulatory assets	$ 523,671	$ 652,981
Regulatory assets, current	(198,443)	(260,312)
Regulatory assets, non-current	325,228	392,669
Regulatory liabilities	571,488	518,573
Regulatory liabilities, current	(101,979)	(46,013)
Regulatory liabilities, non-current	469,509	472,560
Deferred energy and gas costs
Regulatory liabilities	99,649	41,722
Employee benefit plan costs and related deferred taxes
Regulatory liabilities	33,065	34,258
Cost of removal
Regulatory liabilities	178,668	175,614
Excess deferred income taxes
Regulatory liabilities	250,728	254,833
Other regulatory liabilities
Regulatory liabilities	9,378	12,146
Storm Costs
Regulatory assets	233,299	347,980
Deferred energy and gas costs
Regulatory assets	68,708	72,580
Deferred gas cost adjustments
Regulatory assets	8,777	12,147
Gas price derivatives
Regulatory assets	0	8,793
Regulatory liabilities	100
Deferred taxes on AFUDC
Regulatory assets	7,305	7,333
Employee benefit plans and related deferred taxes
Regulatory assets	88,203	89,259
Environmental
Regulatory assets	1,346	1,343
Loss on reacquired debt
Regulatory assets	18,315	19,213
Deferred taxes on flow through accounting
Regulatory assets	74,165	69,529
Decommissioning costs
Regulatory assets	2,406	3,472
Other regulatory assets
Regulatory assets	$ 21,147	$ 21,332

Regulatory Matters_ Gas Utiliti

Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Millions	Jul. 12, 2023 USD ($)	May 18, 2023 USD ($) mi	May 09, 2023 USD ($) mi	Jan. 26, 2023 USD ($)	Jun. 01, 2022 mi
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi			10,000
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 27
Public utilities, requested equity capital structure, percentage			51%
Public utilities, requested debt capital structure, percentage			49%
Public Utilities, Requested Return on Equity, Percentage			10.49%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC.
Public Utilities, General Disclosures [Line Items]
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider	$ 8.3
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Weighted average cost of capital	6.93%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 8.2
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Minimum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage	50%
Public Utilities, Approved Debt Capital Structure, Percentage	50%
Public Utilities, Approved Return on Equity, Percentage	9.50%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Maximum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage	52%
Public Utilities, Approved Debt Capital Structure, Percentage	48%
Public Utilities, Approved Return on Equity, Percentage	9.70%
Wyoming Public Service Commission | Black Hills Energy - Wyoming Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi		6,400
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 19
Public utilities, requested equity capital structure, percentage		52%
Public utilities, requested debt capital structure, percentage		48%
Public Utilities, Requested Return on Equity, Percentage		10.49%
Wyoming Public Service Commission | Wyoming Electric | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments | mi					1,330
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments | mi					59
Wyoming Public Service Commission | Wyoming Electric | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage				52%
Public Utilities, Approved Debt Capital Structure, Percentage				48%
Public Utilities, Approved Return on Equity, Percentage				9.75%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 8.7

Revenue_ Disaggregation of Reve

Revenue: Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from contracts with customers	$ 405,136	$ 470,324	$ 1,317,191	$ 1,292,093
Revenue	411,283	474,195	1,332,442	1,297,765
Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	331,153	398,106	1,141,601	1,131,925
Transportation
Revenue from contracts with customers	35,798	34,567	88,526	83,991
Wholesale
Revenue from contracts with customers	5,739	8,428	15,137	18,703
Market - off-system sales
Revenue from contracts with customers	8,407	8,844	24,812	16,236
Transmission/Other
Revenue from contracts with customers	24,039	20,379	47,115	41,238
Other revenues
Revenue	6,147	3,871	15,251	5,672
Services transferred at a point in time
Revenue from contracts with customers	7,844	6,671	16,501	13,784
Services transferred over time
Revenue from contracts with customers	397,292	463,653	1,300,690	1,278,309
Electric Utilities
Revenue from contracts with customers	189,706	201,309	407,535	406,977
Revenue	193,073	204,379	411,782	410,917
Electric Utilities | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	156,372	169,032	331,275	341,838
Electric Utilities | Transportation
Revenue from contracts with customers	0	0	0	0
Electric Utilities | Wholesale
Revenue from contracts with customers	5,739	8,428	15,137	18,703
Electric Utilities | Market - off-system sales
Revenue from contracts with customers	8,364	8,666	24,488	15,820
Electric Utilities | Transmission/Other
Revenue from contracts with customers	19,231	15,183	36,635	30,616
Electric Utilities | Other revenues
Revenue	3,367	3,070	4,247	3,940
Electric Utilities | Services transferred at a point in time
Revenue from contracts with customers	7,844	6,671	16,501	13,784
Electric Utilities | Services transferred over time
Revenue from contracts with customers	181,862	194,638	391,034	393,193
Gas Utilities
Revenue from contracts with customers	219,940	273,263	918,632	893,612
Revenue	222,720	274,169	929,636	895,561
Gas Utilities | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	174,781	229,074	810,326	790,087
Gas Utilities | Transportation
Revenue from contracts with customers	35,913	34,667	88,756	84,190
Gas Utilities | Wholesale
Revenue from contracts with customers	0	0	0	0
Gas Utilities | Market - off-system sales
Revenue from contracts with customers	43	178	324	416
Gas Utilities | Transmission/Other
Revenue from contracts with customers	9,203	9,344	19,226	18,919
Gas Utilities | Other revenues
Revenue	2,780	906	11,004	1,949
Gas Utilities | Services transferred at a point in time
Revenue from contracts with customers	0	0	0	0
Gas Utilities | Services transferred over time
Revenue from contracts with customers	219,940	273,263	918,632	893,612
Inter-segment Revenues
Revenue from contracts with customers	(4,510)	(4,248)	(8,976)	(8,496)
Revenue	(4,510)	(4,353)	(8,976)	(8,713)
Inter-segment Revenues | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	0	0	0	0
Inter-segment Revenues | Transportation
Revenue from contracts with customers	(115)	(100)	(230)	(199)
Inter-segment Revenues | Wholesale
Revenue from contracts with customers	0	0	0	0
Inter-segment Revenues | Market - off-system sales
Revenue from contracts with customers	0	0	0	0
Inter-segment Revenues | Transmission/Other
Revenue from contracts with customers	(4,395)	(4,148)	(8,746)	(8,297)
Inter-segment Revenues | Other revenues
Revenue	0	(105)	0	(217)
Inter-segment Revenues | Services transferred at a point in time
Revenue from contracts with customers	0	0	0	0
Inter-segment Revenues | Services transferred over time
Revenue from contracts with customers	$ (4,510)	$ (4,248)	$ (8,976)	$ (8,496)

Financing - Schedule of Short-t

Financing - Schedule of Short-term Debt and Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Short-Term Debt [Line Items]
Amount outstanding	$ 0		$ 535,600
Revolving Credit Facility | Commercial Paper
Short-Term Debt [Line Items]
Amount outstanding	0		535,600
Letters of Credit	2,751		24,626
Available capacity	747,249		$ 189,774
Weighted average interest rates			4.88%
Maximum amount outstanding (based on daily outstanding balances)	548,700	$ 429,000
Average amount outstanding (based on daily outstanding balances)	$ 164,719	$ 326,172
Weighted average interest rates	4.91%	0.82%

Financing_ Long-Term Debt (Addi

Financing: Long-Term Debt (Additional Information) (Details) - Senior Unsecured Notes Due 2028 $ in Millions	Mar. 07, 2023 USD ($)
Debt Instrument [Line Items]
Stated interest rate (percent)	5.95%
Debt Instrument, Term	5 years
Less unamortized deferred financing costs	$ 4.2
Corporate, Non-Segment
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 350

Financing_ Debt Covenants (Addi

Financing: Debt Covenants (Additional Information) (Details)	Jun. 30, 2023
Line of Credit Facility [Line Items]
Consolidated indebtedness to capitalization ratio	0.59
Maximum
Line of Credit Facility [Line Items]
Consolidated indebtedness to capitalization ratio	0.65
Wyoming Electric
Line of Credit Facility [Line Items]
Consolidated indebtedness to capitalization ratio	0.52
Wyoming Electric | Maximum
Line of Credit Facility [Line Items]
Consolidated indebtedness to capitalization ratio	0.60

Financing_ At-the-Market Equity

Financing: At-the-Market Equity Offering Program (Additional Information) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 16, 2023	Aug. 04, 2020
Line of Credit Facility [Line Items]
At the market equity offering program authorized aggregate value		$ 400	$ 400
June 16, 2023 ATM Program
Line of Credit Facility [Line Items]
Number of shares issued	46,696

Financing_ At-the-Market Equi_2

Financing: At-the-Market Equity Offering Program (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Number of shares issued	436,202	216,885	881,780	272,592
August 4, 2020 ATM Program
Number of shares issued	329,647	216,885	775,225	272,592
June 16, 2023 ATM Program
Number of shares issued	106,555		106,555
Common Stock
Proceeds, (net of issuance costs)	$ 27.4	$ 16.4	$ 54.9	$ 20.2
Average price per share	$ 63.53	$ 76.39	$ 62.86	$ 74.84
Payments of Stock Issuance Costs	$ (0.3)	$ (0.2)	$ (0.6)	$ (0.2)
Common Stock | August 4, 2020 ATM Program
Proceeds, (net of issuance costs)	21	16.4	48.5	20.2
Payments of Stock Issuance Costs	(0.2)	(0.2)	(0.5)	(0.2)
Common Stock | June 16, 2023 ATM Program
Proceeds, (net of issuance costs)	6.4		6.4
Payments of Stock Issuance Costs	$ (0.1)	$ 0	$ (0.1)	$ 0

Earnings Per Share - Earnings P

Earnings Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income available for common stock	$ 23,053	$ 33,415	$ 137,137	$ 150,941
Weighted average shares - Basic (in shares)	66,591	64,721	66,315	64,643
Dilutive effect of:
Equity compensation (in shares)	93	162	104	179
Weighted average shares - diluted (in shares)	66,684	64,883	66,419	64,822
Earnings per share, Basic (usd per share)	$ 0.35	$ 0.52	$ 2.07	$ 2.33
Earnings per share, Diluted (usd per share)	$ 0.35	$ 0.52	$ 2.06	$ 2.33

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares (in shares)	77	0	47	1
Share-Based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares (in shares)	76	0	47	0
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares (in shares)	1	0	0	1

Risk Management and Derivativ_3

Risk Management and Derivatives: Utilities (Details) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2023 USD ($) MMBTU	Dec. 31, 2022 MMBTU
Derivative [Line Items]
Credit Risk Derivative Liabilities, at Fair Value | $		$ 0.6
Natural Gas, Distribution | Cash Flow Hedging
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		3,151,300
Natural Gas, Distribution | Natural gas futures purchased
Derivative [Line Items]
Derivative, Remaining Maturity	[1]	8 months	3 months
Natural Gas, Distribution | Natural gas futures purchased | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		80,000	630,000
Natural Gas, Distribution | Natural gas options purchased, net
Derivative [Line Items]
Derivative, Remaining Maturity	[1]	9 months	3 months
Natural Gas, Distribution | Natural gas options purchased, net | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		120,000	1,790,000
Natural Gas, Distribution | Natural gas basis swaps purchased
Derivative [Line Items]
Derivative, Remaining Maturity	[1]	8 months	3 months
Natural Gas, Distribution | Natural gas basis swaps purchased | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		80,000	900,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net
Derivative [Line Items]
Derivative, Remaining Maturity	[1],[2]	27 months	24 months
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	[2]	6,580,000	4,460,000
Natural Gas, Distribution | Natural gas physical contracts, net
Derivative [Line Items]
Derivative, Remaining Maturity	[1],[3]	9 months	12 months
Natural Gas, Distribution | Natural gas physical contracts, net | Long
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	[3]	1,813,165	17,864,412
[1] Term reflects the maximum forward period hedged. As of June 30, 2023 , 3,151,300 MMBtus of natural gas over-the-counter swaps purchases were designated as cash flow hedges. Volumes exclude derivative contracts that qualify for the normal purchases and normal sales exception permitted by GAAP.

Risk Management and Derivativ_4

Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 344	$ (1,387)
Commodity Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(511)	(4,114)
Derivative assets, current | Commodity Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	408	118
Derivative assets, current | Commodity Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	(105)	464
Other assets, non-current | Commodity Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	198
Derivative Liability, Fair Value, Gross Liability	(64)
Other assets, non-current | Commodity Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	337
Derivative liabilities, current | Commodity Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	(1,703)
Derivative liabilities, current | Commodity Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(322)	(4,897)
Other deferred credits and other liabilities | Commodity Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (84)	$ (18)

Risk Management and Derivativ_5

Risk Management and Derivatives: Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest rate swaps
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ 2,900
Designated as Hedging Instrument
Derivative [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ 1,349	$ (3,658)	2,889	$ (3,812)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (1,202)	$ 610	$ (3,865)	$ 2,151
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ 713	$ 713	$ 1,426	$ 1,426
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ (713)	$ (713)	$ (1,426)	$ (1,426)
Derivative Instrument, Loss Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Costs Incurred	Interest Costs Incurred	Interest Costs Incurred	Interest Costs Incurred
Designated as Hedging Instrument | Commodity Contract
Derivative [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ 636	$ (4,371)	$ 1,463	$ (5,238)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ (489)		$ (2,439)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		$ 1,323		$ 3,577
Derivative Instrument, Gain Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold

Risk Management and Derivativ_6

Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Regulatory assets	$ 523,671		$ 523,671		$ 652,981
Regulatory liabilities	571,488		571,488		518,573
Gas price derivatives
Derivative [Line Items]
Regulatory assets	0		0		$ 8,793
Regulatory liabilities	100		100
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 394	$ (2,332)	$ (2,700)	$ 1,162
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold
Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Derivative, Loss on Derivative		$ (2,332)	$ (2,700)
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold	Fuel, Purchased Power and Cost of Gas Sold
Derivative, Gain on Derivative	$ 394			$ 1,162

Fair Value Measurements_ Schedu

Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current	Derivative Asset, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current	Derivative Liability, Current
Contract Subject to Master Netting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 800,000	$ 4,300,000
Derivative Liability, Fair Value, Gross Liability	0	4,800,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(751,000)	(4,290,000)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(25,000)	(4,837,000)
Fair Value, Measurements, Recurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Total	303,000	1,117,000
Derivative Liabilities, Total	470,000	6,618,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Total	0	0
Derivative Liabilities, Total	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Total	1,054,000	5,407,000
Derivative Liabilities, Total	495,000	11,455,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Total	0	0
Derivative Liabilities, Total	0	0
Fair Value, Measurements, Recurring | Gas Utilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(751,000)	(4,290,000)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(25,000)	(4,837,000)
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	303,000	1,117,000
Derivative, Liabilities, Fair Value Disclosure	470,000	6,618,000
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	0	0
Derivative, Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	1,054,000	5,407,000
Derivative, Liabilities, Fair Value Disclosure	495,000	11,455,000
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	0	0
Derivative, Liabilities, Fair Value Disclosure	$ 0	$ 0

Fair Value Measurements_ Other

Fair Value Measurements: Other Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 4,480,745	$ 4,132,340
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 4,152,130	$ 3,760,848

Other Comprehensive Income_ Rec

Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	$ 43,267		$ 39,053		$ 87,332	$ 77,874
Fuel, purchased power and cost of natural gas sold	121,245		188,171		647,512	625,097
Operations and maintenance	145,767		132,968		286,755	269,100
Income Tax Expense (Benefit)	6,089		658		(8,584)	(13,830)
Net income	26,544	$ 117,380	35,846	$ 121,024	143,924	156,870
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Operations and maintenance	0		22		0	46
Net income	(923)		424		(2,998)	1,465
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	(1,202)		610		(3,865)	2,151
Income Tax Expense (Benefit)	295		(81)		911	(456)
Net income	(907)		529		(2,954)	1,695
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	(713)		(713)		(1,426)	(1,426)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Fuel, purchased power and cost of natural gas sold	(489)		1,323		(2,439)	3,577
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Operations and maintenance	(43)		(187)		(87)	(375)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	(43)		(165)		(87)	(329)
Income Tax Expense (Benefit)	27		60		43	99
Net income	$ (16)		$ (105)		$ (44)	$ (230)

Other Comprehensive Income_ Acc

Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	$ (15,567)	$ (20,084)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(13,312)	(22,816)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(6,112)	(11,176)
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from AOCI	44	230
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(6,068)	(10,946)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications	(743)	(1,267)
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	2,998	(1,465)
Interest Rate Swap | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(8,255)	(10,384)
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from AOCI	1,099	1,011
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(7,156)	(9,373)
Commodity Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(1,200)	1,476
Other comprehensive income (loss), before reclassifications	(743)	(1,267)
Amounts reclassified from AOCI	1,855	(2,706)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	$ (88)	$ (2,497)

Employee Benefit Plans_ Compone

Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 614	$ 982	$ 1,228	$ 1,964
Interest cost	4,381	2,704	8,761	5,409
Expected return on assets	(4,672)	(4,630)	(9,344)	(9,261)
Net amortization of prior service cost	(17)	(17)	(34)	(34)
Recognized net actuarial loss (gain)	498	1,523	996	3,046
Net periodic expense (benefit)	804	562	1,607	1,124
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	770	(1,355)	1,684	(1,747)
Interest cost	369	209	738	417
Expected return on assets	0	0	0	0
Net amortization of prior service cost	0	0	0	0
Recognized net actuarial loss (gain)	8	69	16	138
Net periodic expense (benefit)	1,147	(1,077)	2,438	(1,192)
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	381	492	762	984
Interest cost	594	321	1,188	642
Expected return on assets	(55)	(31)	(111)	(62)
Net amortization of prior service cost	10	(73)	20	(145)
Recognized net actuarial loss (gain)	(3)	16	(6)	32
Net periodic expense (benefit)	$ 927	$ 725	$ 1,853	$ 1,451

Employee Benefit Plans_ Plan Co

Employee Benefit Plans: Plan Contributions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	$ 0
Payment for Pension Benefits	0
Estimated Future Employer Contributions in Current Fiscal Year	0
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	4,808
Payment for Pension Benefits	2,460
Estimated Future Employer Contributions in Current Fiscal Year	2,460
Supplemental Non-Qualified Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	2,417
Payment for Pension Benefits	1,116
Estimated Future Employer Contributions in Current Fiscal Year	$ 1,116

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Income tax benefit (expense)	$ 6,089	$ 658	$ (8,584)	$ (13,830)
Effective Tax Rate	(29.80%)	(1.90%)	5.60%	8.10%
Northern Lowa Windpower Assets
Income Tax Disclosure [Line Items]
Income tax reconciliation due to sale of assets	$ 2,300		$ 3,000
Nebraska
Income Tax Disclosure [Line Items]
State income tax expense (benefit)	$ (8,200)		$ (8,200)		$ (3,800)

Business Segment Information -

Business Segment Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2023 Segment
Segment Reporting Information, Additional Information [Abstract]
Number of operating segments	2

Business Segment Information_ I

Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information
Revenue	$ 411,283	$ 474,195	$ 1,332,442	$ 1,297,765
Operating income (loss)	63,516	72,389	238,399	245,742
Electric Utilities
Segment Reporting Information
Revenue	193,073	204,379	411,782	410,917
Operating income (loss)	46,619	45,226	107,679	95,972
Gas Utilities
Segment Reporting Information
Revenue	222,720	274,169	929,636	895,561
Operating income (loss)	17,725	28,195	132,350	151,735
Corporate, Non-Segment
Segment Reporting Information
Operating income (loss)	(828)	(1,032)	(1,630)	(1,965)
Inter-segment Revenues
Segment Reporting Information
Revenue	(4,510)	(4,353)	(8,976)	(8,713)
External Customers | Electric Utilities
Segment Reporting Information
Revenue	190,212	201,450	406,105	405,059
External Customers | Gas Utilities
Segment Reporting Information
Revenue	221,071	272,745	926,337	892,706
Intercompany Customers | Electric Utilities
Segment Reporting Information
Revenue	2,861	2,929	5,677	5,858
Intercompany Customers | Gas Utilities
Segment Reporting Information
Revenue	$ 1,649	$ 1,424	$ 3,299	$ 2,855

Business Segment Information_ S

Business Segment Information: Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item
Total Assets	$ 9,409,095	$ 9,618,230
Corporate and Other
Segment Reporting, Asset Reconciling Item
Total Assets	242,537	110,227
Electric Utilities
Segment Reporting, Asset Reconciling Item
Total Assets	3,914,037	3,929,721
Gas Utilities
Segment Reporting, Asset Reconciling Item
Total Assets	$ 5,252,521	$ 5,578,282

Selected Balance Sheet Inform_3

Selected Balance Sheet Information: Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Selected Balance Sheet Information [Abstract]
Billed Accounts Receivable	$ 192,444	$ 267,571
Unbilled Revenue	71,097	243,574
Less: Allowance for Credit Losses	(3,191)	(2,953)	$ (3,193)	$ (2,113)
Account Receivable, net	$ 260,350	$ 508,192

Selected Balance Sheet Inform_4

Selected Balance Sheet Information: Changes to Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Selected Balance Sheet Information [Abstract]
Balance at Beginning of Year	$ 2,953	$ 2,113
Additions Charged to Costs and Expenses	4,278	4,239
Recoveries and Other Additions	1,444	1,266
Write-offs and Other Deductions	(5,484)	(4,425)
Balance at End of Year	$ 3,191	$ 3,193

Selected Balance Sheet Inform_5

Selected Balance Sheet Information: Materials, Supplies, and Fuel Schedule (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Selected Balance Sheet Information [Abstract]
Materials and supplies	$ 101,854	$ 99,734
Fuel - Electric Utilities	7,757	3,115
Natural gas in storage	26,923	104,572
Total materials, supplies and fuel	$ 136,534	$ 207,421

Selected Balance Sheet Inform_6

Selected Balance Sheet Information: Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Selected Balance Sheet Information [Abstract]
Accrued employee compensation, benefits and withholdings	$ 62,031	$ 62,890
Accrued property taxes	40,298	52,430
Customer deposits and prepayments	42,730	47,655
Accrued interest	40,715	33,798
Other (none of which is individually significant)	31,485	46,684
Total accrued liabilities	$ 217,259	$ 243,457