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Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2024

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventory

Inventories of materials and supplies, emission allowances, fuel stock and stored natural gas are recorded at average cost and consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30,				December 31,
		2024				2023
Materials and supplies		$	97,398			$	81,651
Emission allowances			69,885				56,097
Stored natural gas			11,239				16,272
Fuel stock			7,418				5,964
Total		$	185,940			$	159,984

Schedule of Other Current Assets

Other current assets consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30,				December 31,
		2024				2023
Prepayments		$	40,074			$	52,752
Income taxes receivable			9,102				29,234
Derivative assets net of collateral			6,785				11,821
Collateral posted for derivative instruments after netting with outstanding derivatives			4,858				—
Other			10,288				9,977
Total		$	71,107			$	103,784

Schedule of Net Utility Property Recorded at Original Cost Net of Accumulated Depreciation

Net utility property, which is recorded at original cost, net of accumulated depreciation, consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30,				December 31,
		2024				2023
Utility plant in service		$	8,067,517			$	7,799,481
Construction work in progress			246,490				179,527
Total			8,314,007				7,979,008
Less: Accumulated depreciation and amortization			2,389,617				2,278,952
Total		$	5,924,390			$	5,700,056

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30,				December 31,
		2024				2023
Equity investments		$	159,227			$	153,350
Operating lease ROU assets			66,334				67,585
Finance lease ROU assets			33,683				36,414
Non-utility property			33,504				33,813
Notes receivable			15,295				15,287
Long-term prepaid license fees			19,314				19,448
Pension asset			44,278				32,997
Investment in affiliated trust			11,547				11,547
Deferred compensation assets			8,962				7,794
Other			19,607				15,750
Total		$	411,751			$	393,985

Other Current Liabilities

Other current liabilities consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30, 2024				December 31, 2023
Accrued taxes other than income taxes		$	29,160			$	31,928
Derivative liabilities net of collateral			27,612				17,217
Employee paid time off accruals			33,222				32,072
Accrued interest			41,863				23,539
Climate Commitment Act obligations			—				19,081
Pensions and other postretirement benefits			14,852				14,082
Other			54,489				54,017
Total		$	201,198			$	191,936

Schedule of Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30, 2024				December 31, 2023
Operating lease liabilities		$	65,386			$	63,559
Finance lease liabilities			36,421				39,095
Deferred investment tax credits			28,303				28,233
Climate Commitment Act obligations			66,375				26,026
Asset retirement obligations			18,207				18,058
Derivative liabilities net of collateral			11,661				17,902
Other			21,253				17,357
Total		$	247,606			$	210,230

Schedule of Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of September 30, 2024 and December 31, 2023 (dollars in thousands):


		September 30, 2024								December 31, 2023
		Current				Non-Current				Current				Non-Current
Regulatory Assets
Energy commodity derivatives		$	38,033			$	12,708			$	51,419			$	17,720
Deferred Climate Commitment Act costs			36,102				21,834				—				46,022
Deferred power costs			13,410				22,724				29,190				20,654
Wildfire resiliency			8,277				14,312				—				23,737
Decoupling surcharge			10,476				8,123				4,638				5,469
Deferred natural gas costs			3,376				—				60,667				—
Income tax related assets			—				246,863				—				244,303
Pension and other postretirement benefit plans			—				111,844				—				117,658
Interest rate swaps			—				174,151				—				179,489
AFUDC above FERC allowed rate			—				48,232				—				49,985
Settlement with Coeur d'Alene Tribe			—				35,855				—				36,692
Advanced meter infrastructure			—				27,069				—				29,345
Utility plant abandoned			—				31,610				—				38,274
Colstrip excess depreciation			—				23,824				—				19,429
COVID-19 deferrals			—				11,846				—				12,142
Demand side management programs			—				27,496				—				10,033
Other regulatory assets			5,523				48,751				413				43,216
Total regulatory assets		$	115,197			$	867,242			$	146,327			$	894,168
Regulatory Liabilities
Other income tax related liabilities		$	8,918			$	53,859			$	25,129			$	56,582
Excess deferred income taxes			14,223				282,629				14,510				293,029
Deferred Climate Commitment Act revenues			32,947				14,296				—				37,231
Deferred power costs			7,172				5,312				—				4,000
Deferred natural gas costs			13,213				—				9,296				—
Decoupling rebate			7,495				3,150				18,680				6,344
Utility plant retirement costs			—				439,874				—				417,027
Interest rate swaps			—				23,580				—				23,752
COVID-19 deferrals			—				10,443				—				10,172
Other regulatory liabilities			8,227				6,904				8,392				8,529
Total regulatory liabilities		$	92,195			$	840,047			$	76,007			$	856,666