Income Taxes (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate		21.00%	21.00%	21.00%	21.00%
State tax (net of federal tax effect)		5.10%	5.20%	4.90%	5.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	[1]	(64.00%)	(48.30%)	(44.10%)	(40.40%)
Plant regulatory differences (b)	[2]	(6.30%)	(5.50%)	(5.80%)	(5.10%)
Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback, Percent		(1.40%)	(1.40%)	(1.50%)	(1.50%)
Other (net)		1.60%	(0.10%)	0.50%	(0.20%)
Effective income tax rate		(44.00%)	(29.10%)	(25.00%)	(21.20%)

[1] Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income

[2] Plant regulatory differences primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit are offset by corresponding revenue reductions.