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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 2022
Balance Sheet Related Disclosures [Abstract] |
Materials and Supplies, Fuel Stock and Stored Natural Gas | Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or net realizable value for our non-regulated operations and consisted of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Materials and supplies |  | $ | 70,601 |  |  | $ | 62,003 |
Fuel stock |  |  | 5,776 |  |  |  | 5,126 |
Stored natural gas |  |  | 29,414 |  |  |  | 17,604 |
Total |  | $ | 105,791 |  |  | $ | 84,733 |
Schedule of Other Current Assets | Other current assets consisted of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Collateral posted for derivative instruments after netting with outstanding derivatives |  | $ | 7,821 |  |  | $ | 21,477 |
Prepayments |  |  | 26,437 |  |  |  | 24,387 |
Income taxes receivable |  |  | 29,785 |  |  |  | 29,615 |
Derivative assets net of collateral |  |  | 11,026 |  |  |  | 1,398 |
Other |  |  | 4,161 |  |  |  | 3,877 |
Total |  | $ | 79,230 |  |  | $ | 80,754 |
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, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Utility plant in service |  | $ | 7,354,890 |  |  | $ | 7,166,580 |
Construction work in progress |  |  | 164,999 |  |  |  | 205,405 |
Total |  |  | 7,519,889 |  |  |  | 7,371,985 |
Less: Accumulated depreciation and amortization |  |  | 2,212,483 |  |  |  | 2,146,470 |
Total |  | $ | 5,307,406 |  |  | $ | 5,225,515 |
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, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Operating lease ROU assets |  | $ | 69,183 |  |  | $ | 70,133 |
Equity investments |  |  | 111,957 |  |  |  | 91,057 |
Finance lease ROU assets |  |  | 41,876 |  |  |  | 43,697 |
Non-utility property |  |  | 25,459 |  |  |  | 20,033 |
Notes receivable |  |  | 17,049 |  |  |  | 14,949 |
Long-term prepaid license fees |  |  | 15,746 |  |  |  | 8,465 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Derivative assets net of collateral |  |  | 11,167 |  |  |  | 2,659 |
Deferred compensation assets |  |  | 7,994 |  |  |  | 9,513 |
Other |  |  | 9,788 |  |  |  | 8,490 |
Total |  | $ | 321,766 |  |  | $ | 280,543 |
Other Current Liabilities | Other current liabilities consisted of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, 2022 |  |  | December 31, 2021 |
Accrued taxes other than income taxes |  | $ | 39,754 |  |  | $ | 41,706 |
Derivative liabilities |  |  | 4,678 |  |  |  | 28,801 |
Employee paid time off accruals |  |  | 30,884 |  |  |  | 27,741 |
Accrued interest |  |  | 20,283 |  |  |  | 17,538 |
Deferred derivative revenue |  |  | 18,824 |  |  |  | 884 |
Pensions and other postretirement benefits |  |  | 13,703 |  |  |  | 13,582 |
Other |  |  | 44,851 |  |  |  | 38,609 |
Total |  | $ | 172,977 |  |  | $ | 168,861 |
Schedule of Other Non-Current Liabilities and Deferred Credits | Other non-current liabilities and deferred credits consisted of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, 2022 |  |  | December 31, 2021 |
Operating lease liabilities |  | $ | 67,145 |  |  | $ | 66,068 |
Finance lease liabilities |  |  | 44,113 |  |  |  | 45,730 |
Deferred investment tax credits |  |  | 29,038 |  |  |  | 29,313 |
Asset retirement obligations |  |  | 16,322 |  |  |  | 17,142 |
Derivative liabilities |  |  | 2,698 |  |  |  | 4,525 |
Other |  |  | 15,707 |  |  |  | 15,347 |
Total |  | $ | 175,023 |  |  | $ | 178,125 |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities consisted of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, 2022 |  |  | December 31, 2021 |
|  | Current |  |  | Non-Current |  |  | Current |  |  | Non-Current |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives |  | $ | — |  |  | $ | — |  |  | $ | 12,447 |  |  | $ | 2,938 |
Decoupling surcharge |  |  | 8,834 |  |  |  | 3,793 |  |  |  | 9,907 |  |  |  | 14,625 |
Deferred natural gas costs |  |  | 29,647 |  |  |  | 11,323 |  |  |  | 14,095 |  |  |  | 6,932 |
Deferred power costs |  |  | 5,300 |  |  |  | 1,059 |  |  |  | 7,334 |  |  |  | 3,501 |
Pension and other postretirement benefit plans |  |  | — |  |  |  | 162,943 |  |  |  | — |  |  |  | 165,696 |
Interest rate swaps |  |  | — |  |  |  | 189,347 |  |  |  | — |  |  |  | 199,754 |
Deferred income taxes |  |  | — |  |  |  | 245,893 |  |  |  | — |  |  |  | 244,154 |
Settlement with Coeur d'Alene Tribe |  |  | — |  |  |  | 38,368 |  |  |  | — |  |  |  | 38,926 |
AFUDC above FERC allowed rate |  |  | — |  |  |  | 50,328 |  |  |  | — |  |  |  | 48,455 |
Demand side management programs |  |  | — |  |  |  | 3,736 |  |  |  | — |  |  |  | 3,974 |
Utility plant to be abandoned |  |  | — |  |  |  | 25,555 |  |  |  | — |  |  |  | 26,771 |
COVID-19 deferrals |  |  | — |  |  |  | 13,963 |  |  |  | — |  |  |  | 13,591 |
Unamortized debt repurchase costs |  |  | — |  |  |  | 6,434 |  |  |  | — |  |  |  | 6,768 |
Advanced meter infrastructure |  |  | — |  |  |  | 34,194 |  |  |  | — |  |  |  | 36,008 |
Other regulatory assets |  |  | 418 |  |  |  | 52,219 |  |  |  | — |  |  |  | 48,533 |
Total regulatory assets |  | $ | 44,199 |  |  | $ | 839,155 |  |  | $ | 43,783 |  |  | $ | 860,626 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Income tax related liabilities |  | $ | 73,207 |  |  | $ | 416,719 |  |  | $ | 56,331 |  |  | $ | 458,789 |
Energy commodity derivatives |  |  | 1,801 |  |  |  | 522 |  |  |  | — |  |  |  | — |
Deferred power costs |  |  | — |  |  |  | 6,610 |  |  |  | 6,457 |  |  |  | 5,434 |
Decoupling rebate |  |  | 3,624 |  |  |  | 16,330 |  |  |  | 3,049 |  |  |  | 6,259 |
Utility plant retirement costs |  |  | — |  |  |  | 357,367 |  |  |  | — |  |  |  | 350,190 |
Interest rate swaps |  |  | — |  |  |  | 21,270 |  |  |  | — |  |  |  | 15,062 |
COVID-19 deferrals |  |  | — |  |  |  | 12,049 |  |  |  | — |  |  |  | 12,500 |
Other regulatory liabilities |  |  | 15,977 |  |  |  | 16,006 |  |  |  | 11,312 |  |  |  | 13,281 |
Total regulatory liabilities |  | $ | 94,609 |  |  | $ | 846,873 |  |  | $ | 77,149 |  |  | $ | 861,515 |

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