Revenue - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Operating revenues	$ 5,339,939	$ 5,124,915	$ 4,695,991
Regulatory cost recovery revenue	$ 21,000	52,000	45,000
Retail Electric Service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, payment terms	21 days
Electric and Transmission Service
Disaggregation of Revenue [Line Items]
Operating revenues	$ 5,319,000	$ 5,073,000	$ 4,651,000