Balance Sheet Components

9 Months Ended

Sep. 30, 2023

Balance Sheet Related Disclosures [Abstract]

NOTE 3. BALANCE SHEET COMPONENTS

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


	September 30,		December 31,
	2023		2022
Materials and supplies	$	80,916	$	75,766
Emission allowances		40,842		—
Stored natural gas		17,841		26,788
Fuel stock		5,575		5,120
Total	$	145,174	$	107,674

Other Current Assets

Other current assets consisted of the following as of September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30,		December 31,
	2023		2022
Prepayments	$	51,194	$	30,201
Income taxes receivable		32,157		30,740
Derivative assets net of collateral		1,981		18,198
Collateral posted for derivative instruments after netting with outstanding derivatives		—		66,142
Other		8,257		5,886
Total	$	93,589	$	151,167

Net Utility Property

Net utility property, which is recorded at original cost, net of accumulated depreciation, consisted of the following as of September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30,		December 31,
	2023		2022
Utility plant in service	$	7,708,173	$	7,561,688
Construction work in progress		199,365		164,147
Total		7,907,538		7,725,835
Less: Accumulated depreciation and amortization		2,282,470		2,281,126
Total	$	5,625,068	$	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 September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30,		December 31,
	2023		2022
Equity investments	$	154,873	$	147,809
Operating lease ROU assets		68,087		68,238
Finance lease ROU assets		37,324		40,056
Non-utility property		30,909		25,401
Notes receivable		18,234		17,954
Long-term prepaid license fees		16,293		17,936
Pension asset		22,268		13,382
Investment in affiliated trust		11,547		11,547
Deferred compensation assets		7,763		7,541
Other		22,919		15,221
Total	$	390,217	$	365,085

Other Current Liabilities

Other current liabilities consisted of the following as of September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30, 2023		December 31, 2022
Accrued taxes other than income taxes	$	29,722	$	38,568
Derivative liabilities		19,684		26,910
Employee paid time off accruals		31,231		29,279
Accrued interest		42,610		20,863
Deferred wholesale revenue		—		8,481
Pensions and other postretirement benefits		14,327		15,625
Other		45,227		49,689
Total	$	182,801	$	189,415

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30, 2023		December 31, 2022
Operating lease liabilities	$	67,088	$	64,284
Finance lease liabilities		39,945		42,495
Deferred investment tax credits		28,371		28,784
Climate Commitment Act obligations		30,457		—
Asset retirement obligations		16,024		15,783
Derivative liabilities		14,035		7,892
Other		16,786		16,617
Total	$	212,706	$	175,855

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of September 30, 2023 and December 31, 2022 (dollars in thousands):


	September 30, 2023				December 31, 2022
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	45,144	$	13,715	$	112,090	$	18,185
Decoupling surcharge		2,087		3,407		6,250		5,449
Deferred natural gas costs		84,851		—		52,091		—
Deferred power costs		34,751		17,766		23,356		24,043
Deferred income taxes		—		242,498		—		240,325
Pension and other postretirement benefit plans		—		131,269		—		135,337
Interest rate swaps		—		181,050		—		185,919
AFUDC above FERC allowed rate		—		49,778		—		51,649
Settlement with Coeur d'Alene Tribe		—		36,972		—		37,809
Advanced meter infrastructure		—		30,104		—		32,381
Utility plant abandoned		—		30,362		—		24,389
Deferred Climate Commitment Act costs		—		30,760		—		—
COVID-19 deferrals		—		10,170		—		9,793
Unamortized debt repurchase costs		—		5,817		—		6,177
Demand side management programs		—		2,728		—		3,683
Other regulatory assets		1,094		68,703		—		58,189
Total regulatory assets	$	167,927	$	855,099	$	193,787	$	833,328
Regulatory Liabilities
Income tax related liabilities	$	41,680	$	357,812	$	73,267	$	390,734
Deferred natural gas costs		6,599		—		—		—
Deferred power costs		—		3,712		—		—
Decoupling rebate		13,644		21,327		9,469		20,476
Utility plant retirement costs		—		411,250		—		376,817
Interest rate swaps		—		26,681		—		24,204
Deferred Climate Commitment Act revenues		—		21,675		—		—
COVID-19 deferrals		—		10,640		—		11,874
Other regulatory liabilities		11,920		10,620		12,929		16,732
Total regulatory liabilities	$	73,843	$	863,717	$	95,665	$	840,837