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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