Power Purchase Agreements - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Public Utilities General Disclosures [Line Items]
Energy requirements from owned generating facilities	51.50%	55.60%	52.00%
Purchased power	$ 462,526	$ 234,471	$ 250,546
ACES [Member]
Public Utilities General Disclosures [Line Items]
Change in power price collateral	5,600
PJM Transactions [Member]
Public Utilities General Disclosures [Line Items]
Change in power price collateral	$ 7,900	$ 5,200