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Revenue - Schedule of Disaggregation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 1,121,703 | $ 1,061,669 | $ 2,066,658 | $ 1,845,200
Regulatory cost recovery revenue | 10,000 | (2,000) | 33,000 | 10,000
Retail Electric Service | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 542,315 | 537,589 | 952,039 | 904,935
Retail Electric Service | Non-Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 516,712 | 462,669 | 922,849 | 822,185
Wholesale Energy Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 27,282 | 29,902 | 122,885 | 58,805
Transmission Services for Others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 33,152 | 29,352 | 64,943 | 54,844
Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 2,242 | 2,157 | 3,942 | 4,431
Electric and Transmission Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 1,112,000 | $ 1,064,000 | $ 2,034,000 | $ 1,835,000

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