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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 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 June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Materials and supplies |  | $ | 92,446 |  |  | $ | 81,651 |
Emission allowances |  |  | 64,925 |  |  |  | 56,097 |
Stored natural gas |  |  | 10,937 |  |  |  | 16,272 |
Fuel stock |  |  | 7,280 |  |  |  | 5,964 |
Total |  | $ | 175,588 |  |  | $ | 159,984 |
Schedule of Other Current Assets | Other current assets consisted of the following as of June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Prepayments |  | $ | 52,276 |  |  | $ | 52,752 |
Income taxes receivable |  |  | 7,991 |  |  |  | 29,234 |
Derivative assets net of collateral |  |  | 4,462 |  |  |  | 11,821 |
Other |  |  | 11,988 |  |  |  | 9,977 |
Total |  | $ | 76,717 |  |  | $ | 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 June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Utility plant in service |  | $ | 7,946,547 |  |  | $ | 7,799,481 |
Construction work in progress |  |  | 222,560 |  |  |  | 179,527 |
Total |  |  | 8,169,107 |  |  |  | 7,979,008 |
Less: Accumulated depreciation and amortization |  |  | 2,341,964 |  |  |  | 2,278,952 |
Total |  | $ | 5,827,143 |  |  | $ | 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 June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Equity investments |  | $ | 157,369 |  |  | $ | 153,350 |
Operating lease ROU assets |  |  | 66,864 |  |  |  | 67,585 |
Finance lease ROU assets |  |  | 34,593 |  |  |  | 36,414 |
Non-utility property |  |  | 33,508 |  |  |  | 33,813 |
Notes receivable |  |  | 15,578 |  |  |  | 15,287 |
Long-term prepaid license fees |  |  | 21,356 |  |  |  | 19,448 |
Pension asset |  |  | 41,625 |  |  |  | 32,997 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Deferred compensation assets |  |  | 8,551 |  |  |  | 7,794 |
Other |  |  | 17,583 |  |  |  | 15,750 |
Total |  | $ | 408,574 |  |  | $ | 393,985 |
Other Current Liabilities | Other current liabilities consisted of the following as of June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, 2024 |  |  | December 31, 2023 |
Accrued taxes other than income taxes |  | $ | 28,572 |  |  | $ | 31,928 |
Derivative liabilities net of collateral |  |  | 23,764 |  |  |  | 17,217 |
Employee paid time off accruals |  |  | 35,110 |  |  |  | 32,072 |
Accrued interest |  |  | 24,080 |  |  |  | 23,539 |
Climate Commitment Act obligations |  |  | — |  |  |  | 19,081 |
Pensions and other postretirement benefits |  |  | 11,130 |  |  |  | 14,082 |
Other |  |  | 44,105 |  |  |  | 54,017 |
Total |  | $ | 166,761 |  |  | $ | 191,936 |
Schedule of Other Non-Current Liabilities and Deferred Credits | Other non-current liabilities and deferred credits consisted of the following as of June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, 2024 |  |  | December 31, 2023 |
Operating lease liabilities |  | $ | 64,851 |  |  | $ | 63,559 |
Finance lease liabilities |  |  | 37,313 |  |  |  | 39,095 |
Deferred investment tax credits |  |  | 27,833 |  |  |  | 28,233 |
Climate Commitment Act obligations |  |  | 65,046 |  |  |  | 26,026 |
Asset retirement obligations |  |  | 18,210 |  |  |  | 18,058 |
Derivative liabilities net of collateral |  |  | 8,665 |  |  |  | 17,902 |
Other |  |  | 19,902 |  |  |  | 17,357 |
Total |  | $ | 241,820 |  |  | $ | 210,230 |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities consisted of the following as of June 30, 2024 and December 31, 2023 (dollars in thousands):
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Current |  |  | Non-Current |  |  | Current |  |  | Non-Current |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives |  | $ | 41,242 |  |  | $ | 10,362 |  |  | $ | 51,419 |  |  | $ | 17,720 |
Deferred Climate Commitment Act costs |  |  | 39,558 |  |  |  | 20,530 |  |  |  | — |  |  |  | 46,022 |
Deferred power costs |  |  | 17,859 |  |  |  | 12,895 |  |  |  | 29,190 |  |  |  | 20,654 |
Wildfire resiliency |  |  | 10,487 |  |  |  | 12,490 |  |  |  | — |  |  |  | 23,737 |
Decoupling surcharge |  |  | 8,133 |  |  |  | 8,218 |  |  |  | 4,638 |  |  |  | 5,469 |
Deferred natural gas costs |  |  | 9,452 |  |  |  | — |  |  |  | 60,667 |  |  |  | — |
Deferred income taxes |  |  | — |  |  |  | 247,393 |  |  |  | — |  |  |  | 244,303 |
Pension and other postretirement benefit plans |  |  | — |  |  |  | 112,730 |  |  |  | — |  |  |  | 117,658 |
Interest rate swaps |  |  | — |  |  |  | 175,820 |  |  |  | — |  |  |  | 179,489 |
AFUDC above FERC allowed rate |  |  | — |  |  |  | 48,727 |  |  |  | — |  |  |  | 49,985 |
Settlement with Coeur d'Alene Tribe |  |  | — |  |  |  | 36,134 |  |  |  | — |  |  |  | 36,692 |
Advanced meter infrastructure |  |  | — |  |  |  | 27,827 |  |  |  | — |  |  |  | 29,345 |
Utility plant abandoned |  |  | — |  |  |  | 36,878 |  |  |  | — |  |  |  | 38,274 |
Colstrip excess depreciation |  |  | — |  |  |  | 22,347 |  |  |  | — |  |  |  | 19,429 |
COVID-19 deferrals |  |  | — |  |  |  | 11,945 |  |  |  | — |  |  |  | 12,142 |
Demand side management programs |  |  | — |  |  |  | 16,068 |  |  |  | — |  |  |  | 10,033 |
Other regulatory assets |  |  | 3,658 |  |  |  | 44,403 |  |  |  | 413 |  |  |  | 43,216 |
Total regulatory assets |  | $ | 130,389 |  |  | $ | 844,767 |  |  | $ | 146,327 |  |  | $ | 894,168 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Other income tax related liabilities |  | $ | 14,753 |  |  | $ | 54,559 |  |  | $ | 25,129 |  |  | $ | 56,582 |
Excess deferred income taxes |  |  | 14,230 |  |  |  | 286,185 |  |  |  | 14,510 |  |  |  | 293,029 |
Deferred Climate Commitment Act revenues |  |  | 34,670 |  |  |  | 9,435 |  |  |  | — |  |  |  | 37,231 |
Deferred power costs |  |  | 250 |  |  |  | 2,463 |  |  |  | — |  |  |  | 4,000 |
Deferred natural gas costs |  |  | 10,469 |  |  |  | — |  |  |  | 9,296 |  |  |  | — |
Decoupling rebate |  |  | 9,648 |  |  |  | 2,869 |  |  |  | 18,680 |  |  |  | 6,344 |
Utility plant retirement costs |  |  | — |  |  |  | 432,227 |  |  |  | — |  |  |  | 417,027 |
Interest rate swaps |  |  | — |  |  |  | 24,405 |  |  |  | — |  |  |  | 23,752 |
COVID-19 deferrals |  |  | — |  |  |  | 10,787 |  |  |  | — |  |  |  | 10,172 |
Other regulatory liabilities |  |  | 10,365 |  |  |  | 6,131 |  |  |  | 8,392 |  |  |  | 8,529 |
Total regulatory liabilities |  | $ | 94,385 |  |  | $ | 829,061 |  |  | $ | 76,007 |  |  | $ | 856,666 |

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