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Balance Sheet Components | 3 Months Ended
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Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract] |
Balance Sheet Components | 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 March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Materials and supplies |  | $ | 89,956 |  |  | $ | 81,651 |
Emission allowances |  |  | 60,168 |  |  |  | 56,097 |
Stored natural gas |  |  | 8,289 |  |  |  | 16,272 |
Fuel stock |  |  | 5,296 |  |  |  | 5,964 |
Total |  | $ | 163,709 |  |  | $ | 159,984 |
Other Current Assets Other current assets consisted of the following as of March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Prepayments |  | $ | 56,222 |  |  | $ | 52,752 |
Income taxes receivable |  |  | 8,727 |  |  |  | 29,234 |
Derivative assets net of collateral |  |  | 3,597 |  |  |  | 11,821 |
Collateral posted for derivative instruments after netting with outstanding derivatives |  |  | 4,314 |  |  |  | — |
Other |  |  | 10,538 |  |  |  | 9,977 |
Total |  | $ | 83,398 |  |  | $ | 103,784 |
Net Utility Property Net utility property, which is recorded at original cost, net of accumulated depreciation, consisted of the following as of March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Utility plant in service |  | $ | 7,848,978 |  |  | $ | 7,799,481 |
Construction work in progress |  |  | 195,727 |  |  |  | 179,527 |
Total |  |  | 8,044,705 |  |  |  | 7,979,008 |
Less: Accumulated depreciation and amortization |  |  | 2,296,410 |  |  |  | 2,278,952 |
Total |  | $ | 5,748,295 |  |  | $ | 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 March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Equity investments |  | $ | 156,156 |  |  | $ | 153,350 |
Operating lease ROU assets |  |  | 67,407 |  |  |  | 67,585 |
Finance lease ROU assets |  |  | 35,504 |  |  |  | 36,414 |
Non-utility property |  |  | 33,736 |  |  |  | 33,813 |
Notes receivable |  |  | 15,432 |  |  |  | 15,287 |
Long-term prepaid license fees |  |  | 18,447 |  |  |  | 19,448 |
Pension asset |  |  | 35,853 |  |  |  | 32,997 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Deferred compensation assets |  |  | 8,484 |  |  |  | 7,794 |
Other |  |  | 16,131 |  |  |  | 15,750 |
Total |  | $ | 398,697 |  |  | $ | 393,985 |
Other Current Liabilities Other current liabilities consisted of the following as of March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
Accrued taxes other than income taxes |  | $ | 38,452 |  |  | $ | 31,928 |
Derivative liabilities |  |  | 17,288 |  |  |  | 17,217 |
Employee paid time off accruals |  |  | 33,095 |  |  |  | 32,072 |
Accrued interest |  |  | 41,116 |  |  |  | 23,539 |
Climate Commitment Act obligations |  |  | — |  |  |  | 19,081 |
Pensions and other postretirement benefits |  |  | 13,280 |  |  |  | 14,082 |
Other |  |  | 44,329 |  |  |  | 54,017 |
Total |  | $ | 187,560 |  |  | $ | 191,936 |
Other Non-Current Liabilities and Deferred Credits Other non-current liabilities and deferred credits consisted of the following as of March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
Operating lease liabilities |  | $ | 64,377 |  |  | $ | 63,559 |
Finance lease liabilities |  |  | 38,204 |  |  |  | 39,095 |
Deferred investment tax credits |  |  | 28,033 |  |  |  | 28,233 |
Climate Commitment Act obligations |  |  | 60,701 |  |  |  | 26,026 |
Asset retirement obligations |  |  | 18,175 |  |  |  | 18,058 |
Derivative liabilities |  |  | 4,773 |  |  |  | 17,902 |
Other |  |  | 19,099 |  |  |  | 17,357 |
Total |  | $ | 233,362 |  |  | $ | 210,230 |
Regulatory Assets and Liabilities Regulatory assets and liabilities consisted of the following as of March 31, 2024 and December 31, 2023 (dollars in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
|  | Current |  |  | Non-Current |  |  | Current |  |  | Non-Current |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives |  | $ | 29,868 |  |  | $ | 4,458 |  |  | $ | 51,419 |  |  | $ | 17,720 |
Decoupling surcharge |  |  | 5,791 |  |  |  | 3,637 |  |  |  | 4,638 |  |  |  | 5,469 |
Deferred natural gas costs |  |  | 24,013 |  |  |  | — |  |  |  | 60,667 |  |  |  | — |
Deferred power costs |  |  | 24,420 |  |  |  | 18,261 |  |  |  | 29,190 |  |  |  | 20,654 |
Deferred income taxes |  |  | — |  |  |  | 245,260 |  |  |  | — |  |  |  | 244,303 |
Pension and other postretirement benefit plans |  |  | — |  |  |  | 116,658 |  |  |  | — |  |  |  | 117,658 |
Interest rate swaps |  |  | — |  |  |  | 177,563 |  |  |  | — |  |  |  | 179,489 |
AFUDC above FERC allowed rate |  |  | — |  |  |  | 49,317 |  |  |  | — |  |  |  | 49,985 |
Settlement with Coeur d'Alene Tribe |  |  | — |  |  |  | 36,413 |  |  |  | — |  |  |  | 36,692 |
Advanced meter infrastructure |  |  | — |  |  |  | 28,586 |  |  |  | — |  |  |  | 29,345 |
Utility plant abandoned |  |  | — |  |  |  | 36,774 |  |  |  | — |  |  |  | 38,274 |
Deferred Climate Commitment Act costs |  |  | — |  |  |  | 61,491 |  |  |  | — |  |  |  | 46,022 |
COVID-19 deferrals |  |  | — |  |  |  | 12,044 |  |  |  | — |  |  |  | 12,142 |
Unamortized debt repurchase costs |  |  | — |  |  |  | 5,584 |  |  |  | — |  |  |  | 5,701 |
Demand side management programs |  |  | — |  |  |  | 10,407 |  |  |  | — |  |  |  | 10,033 |
Other regulatory assets |  |  | 498 |  |  |  | 81,168 |  |  |  | 413 |  |  |  | 80,681 |
Total regulatory assets |  | $ | 84,590 |  |  | $ | 887,621 |  |  | $ | 146,327 |  |  | $ | 894,168 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Other income tax related liabilities |  | $ | 18,436 |  |  | $ | 55,264 |  |  | $ | 25,129 |  |  | $ | 56,582 |
Excess deferred income taxes |  |  | 14,240 |  |  |  | 289,738 |  |  |  | 14,510 |  |  |  | 293,029 |
Deferred natural gas costs |  |  | 8,916 |  |  |  | — |  |  |  | 9,296 |  |  |  | — |
Deferred power costs |  |  | — |  |  |  | 1,631 |  |  |  | — |  |  |  | 4,000 |
Decoupling rebate |  |  | 12,544 |  |  |  | 9,205 |  |  |  | 18,680 |  |  |  | 6,344 |
Utility plant retirement costs |  |  | — |  |  |  | 424,807 |  |  |  | — |  |  |  | 417,027 |
Interest rate swaps |  |  | — |  |  |  | 24,559 |  |  |  | — |  |  |  | 23,752 |
Deferred Climate Commitment Act revenues |  |  | — |  |  |  | 41,775 |  |  |  | — |  |  |  | 37,231 |
COVID-19 deferrals |  |  | — |  |  |  | 9,744 |  |  |  | — |  |  |  | 10,172 |
Other regulatory liabilities |  |  | 8,543 |  |  |  | 7,938 |  |  |  | 8,392 |  |  |  | 8,529 |
Total regulatory liabilities |  | $ | 62,679 |  |  | $ | 864,661 |  |  | $ | 76,007 |  |  | $ | 856,666 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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