Balance Sheet Components

3 Months Ended

Mar. 31, 2023

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

NOTE 3. BALANCE SHEET COMPONENTS

Inventory

Inventories of materials and supplies, emissions allowances, fuel stock and stored natural gas are recorded at average cost and consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31,		December 31,
	2023		2022
Materials and supplies	$	81,523	$	75,766
Emission allowance		13,774		—
Stored natural gas		1,921		26,788
Fuel stock		4,557		5,120
Total	$	101,775	$	107,674

Other Current Assets

Other current assets consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31,		December 31,
	2023		2022
Prepayments	$	47,245	$	30,201
Income taxes receivable		27,815		30,740
Derivative assets net of collateral		871		18,198
Collateral posted for derivative instruments after netting with outstanding    derivatives		34,383		66,142
Other		6,351		5,886
Total	$	116,665	$	151,167

Net Utility Property

Net utility property, which is recorded at original cost, net of accumulated depreciation, consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31,		December 31,
	2023		2022
Utility plant in service	$	7,511,264	$	7,561,688
Construction work in progress		171,785		164,147
Total		7,683,049		7,725,835
Less: Accumulated depreciation and amortization		2,210,915		2,281,126
Total	$	5,472,134	$	5,444,709

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 March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31,		December 31,
	2023		2022
Equity investments	$	150,681	$	147,809
Operating lease ROU assets		69,098		68,238
Finance lease ROU assets		39,145		40,056
Non-utility property		25,535		25,401
Notes receivable		18,272		17,954
Long-term prepaid license fees		17,696		17,936
Pension assets		16,007		13,382
Investment in affiliated trust		11,547		11,547
Deferred compensation assets		7,435		7,541
Held for sale		3,259		—
Other		15,719		15,221
Total	$	374,394	$	365,085

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31, 2023		December 31, 2022
Accrued taxes other than income taxes	$	37,834	$	38,568
Derivative liabilities		10,006		26,910
Employee paid time off accruals		30,843		29,279
Accrued interest		34,310		20,863
Deferred wholesale revenue		—		8,481
Pensions and other postretirement benefits		14,826		15,625
Other		34,576		49,689
Total	$	162,395	$	189,415

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31, 2023		December 31, 2022
Operating lease liabilities	$	66,044	$	64,284
Finance lease liabilities		41,645		42,495
Deferred investment tax credits		28,647		28,784
Climate Commitment Act obligations		21,652		—
Asset retirement obligations		15,880		15,783
Derivative liabilities		5,062		7,892
Other		15,861		16,617
Total	$	194,791	$	175,855

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2023 and December 31, 2022 (dollars in thousands):

	March 31, 2023				December 31, 2022
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	73,968	$	10,769	$	112,090	$	18,185
Decoupling surcharge		4,362		787		6,250		5,449
Deferred natural gas costs		94,653		—		52,091		—
Deferred power costs		37,114		24,143		23,356		24,043
Deferred income taxes		—		237,263		—		240,325
Pension and other postretirement benefit plans		—		133,837		—		135,337
Interest rate swaps		—		184,784		—		185,919
AFUDC above FERC allowed rate		—		50,973		—		51,649
Settlement with Coeur d'Alene Tribe		—		37,530		—		37,809
Advanced meter infrastructure		—		31,622		—		32,381
Utility plant abandoned		—		32,794		—		24,389
Deferred Climate Commitment Act costs		—		19,019		—		—
COVID-19 deferrals		—		9,797		—		9,793
Unamortized debt repurchase costs		—		6,057		—		6,177
Demand side management programs		—		451		—		3,683
Other regulatory assets		—		59,446		—		58,189
Total regulatory assets	$	210,097	$	839,272	$	193,787	$	833,328
Regulatory Liabilities
Income tax related liabilities	$	58,931	$	372,765	$	73,267	$	390,734
Decoupling rebate		11,032		31,754		9,469		20,476
Utility plant retirement costs		—		383,743		—		376,817
Interest rate swaps		—		23,191		—		24,204
COVID-19 deferrals		—		11,637		—		11,874
Other regulatory liabilities		15,499		17,121		12,929		16,732
Total regulatory liabilities	$	85,462	$	840,211	$	95,665	$	840,837