Revenue - Schedule of Disaggregation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total Operating Revenues	$ 4,324,385	$ 3,803,835	$ 3,586,982
Retail Electric Service | Residential
Disaggregation of Revenue [Line Items]
Total Operating Revenues	2,046,111	1,913,324	1,929,178
Retail Electric Service | Non-Residential
Disaggregation of Revenue [Line Items]
Total Operating Revenues	1,767,616	1,586,940	1,486,098
Wholesale Energy Sales
Disaggregation of Revenue [Line Items]
Total Operating Revenues	383,126	187,640	93,345
Transmission Services for Others
Disaggregation of Revenue [Line Items]
Total Operating Revenues	116,628	99,285	65,859
Other Sources
Disaggregation of Revenue [Line Items]
Total Operating Revenues	$ 10,904	$ 16,646	$ 12,502