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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables disaggregate revenues by major source, timing of revenue recognition, and segment:
|  | Three months ended September 30, 2025 |  | Nine months ended September 30, 2025 |
(in thousands) |  | Electric utility |  | All Other |  | Total |  | Electric utility |  | All Other |  | Total |
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 261,780 |  |  | $ | — |  |  | $ | 261,780 |  |  | $ | 735,308 |  |  | $ | — |  |  | $ | 735,308 |  |
Electric energy sales - commercial |  | 251,288 |  |  | — |  |  | 251,288 |  |  | 724,796 |  |  | — |  |  | 724,796 |  |
Electric energy sales - large light and power |  | 278,484 |  |  | — |  |  | 278,484 |  |  | 801,179 |  |  | — |  |  | 801,179 |  |
Electric energy sales - other |  | 4,284 |  |  | — |  |  | 4,284 |  |  | 12,989 |  |  | — |  |  | 12,989 |  |
Other sales |  | — |  |  | 3,158 |  |  | 3,158 |  |  | — |  |  | 11,030 |  |  | 11,030 |  |
Total revenues from contracts with customers |  | 795,836 |  |  | 3,158 |  |  | 798,994 |  |  | 2,274,272 |  |  | 11,030 |  |  | 2,285,302 |  |
Revenues from other sources |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory revenue |  | (17,864) |  |  | — |  |  | (17,864) |  |  | (33,522) |  |  | — |  |  | (33,522) |  |
Other |  | 9,456 |  |  | 24 |  |  | 9,480 |  |  | 27,526 |  |  | 1,766 |  |  | 29,292 |  |
Total revenues from other sources |  | (8,408) |  |  | 24 |  |  | (8,384) |  |  | (5,996) |  |  | 1,766 |  |  | (4,230) |  |
Total revenues |  | $ | 787,428 |  |  | $ | 3,182 |  |  | $ | 790,610 |  |  | $ | 2,268,276 |  |  | $ | 12,796 |  |  | $ | 2,281,072 |  |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues from contracts with customers - services/goods transferred over time |  | $ | 795,836 |  |  | $ | 3,158 |  |  | $ | 798,994 |  |  | $ | 2,274,272 |  |  | $ | 11,030 |  |  | $ | 2,285,302 |  |
|  | Three months ended September 30, 2024 |  | Nine months ended September 30, 2024
(in thousands) |  | Electric utility |  | All Other |  | Total |  | Electric utility |  | All Other |  | Total
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 272,541 |  |  | $ | — |  |  | $ | 272,541 |  |  | $ | 758,602 |  |  | $ | — |  |  | $ | 758,602 |
Electric energy sales - commercial |  | 268,538 |  |  | — |  |  | 268,538 |  |  | 761,788 |  |  | — |  |  | 761,788 |
Electric energy sales - large light and power |  | 294,421 |  |  | — |  |  | 294,421 |  |  | 846,448 |  |  | — |  |  | 846,448 |
Electric energy sales - other |  | 4,532 |  |  | — |  |  | 4,532 |  |  | 14,087 |  |  | — |  |  | 14,087 |
Other sales |  | — |  |  | 2,897 |  |  | 2,897 |  |  | — |  |  | 9,167 |  |  | 9,167 |
Total revenues from contracts with customers |  | 840,032 |  |  | 2,897 |  |  | 842,929 |  |  | 2,380,925 |  |  | 9,167 |  |  | 2,390,092 |
Revenues from other sources |  |  |  |  |  |  |  |  |  |  |  |
Regulatory revenue |  | (19,924) |  |  | — |  |  | (19,924) |  |  | 780 |  |  | — |  |  | 780 |
Other |  | 9,509 |  |  | 725 |  |  | 10,234 |  |  | 28,821 |  |  | 977 |  |  | 29,798 |
Total revenues from other sources |  | (10,415) |  |  | 725 |  |  | (9,690) |  |  | 29,601 |  |  | 977 |  |  | 30,578 |
Total revenues |  | $ | 829,617 |  |  | $ | 3,622 |  |  | $ | 833,239 |  |  | $ | 2,410,526 |  |  | $ | 10,144 |  |  | $ | 2,420,670 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |
Total revenues from contracts with customers - services/goods transferred over time |  | $ | 840,032 |  |  | $ | 2,897 |  |  | $ | 842,929 |  |  | $ | 2,380,925 |  |  | $ | 9,167 |  |  | $ | 2,390,092 |

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