Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Operating revenues	$ 1,149,597	$ 1,032,280
Regulatory cost recovery revenue	$ 26,000	13,000
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	$ 1,124,000	$ 1,019,000