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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 738,658 | $ 784,534 | $ 1,486,308 | $ 1,547,163
Total revenues from other sources | 7,734 | 10,883 | 4,154 | 40,268
Revenues | 746,392 | 795,417 | 1,490,462 | 1,587,431
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 738,658 | 784,534 | 1,486,308 | 1,547,163
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 233,149 | 244,539 | 473,528 | 486,061
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 237,007 | 251,482 | 473,508 | 493,250
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 260,577 | 280,940 | 522,695 | 552,027
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,218 | 4,609 | 8,705 | 9,555
Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,707 | 2,964 | 7,872 | 6,270
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | (1,577) | (486) | (15,658) | 20,704
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 9,311 | 11,369 | 19,812 | 19,564
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 734,951 | 781,570 | 1,478,436 | 1,540,893
Total revenues from other sources | 7,531 | 10,761 | 2,412 | 40,016
Revenues | 742,482 | 792,331 | 1,480,848 | 1,580,909
Electric utility | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 734,951 | 781,570 | 1,478,436 | 1,540,893
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 233,149 | 244,539 | 473,528 | 486,061
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 237,007 | 251,482 | 473,508 | 493,250
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 260,577 | 280,940 | 522,695 | 552,027
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,218 | 4,609 | 8,705 | 9,555
Electric utility | Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | (1,577) | (486) | (15,658) | 20,704
Electric utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 9,108 | 11,247 | 18,070 | 19,312
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,707 | 2,964 | 7,872 | 6,270
Total revenues from other sources | 203 | 122 | 1,742 | 252
Revenues | 3,910 | 3,086 | 9,614 | 6,522
Other | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,707 | 2,964 | 7,872 | 6,270
Other | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,707 | 2,964 | 7,872 | 6,270
Other | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | $ 203 | $ 122 | $ 1,742 | $ 252

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