Income Taxes (Details)		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate, percent		21.00%	21.00%
State tax (net of federal tax effect), percent		2.20%	2.50%
Wind PTCs, percent	[1]	(65.20%)	(55.80%)
Plant regulatory differences, percent	[2]	(3.50%)	(4.00%)
Other tax credits, percent		0.30%	(1.10%)
Other (net), percent		0.00%	0.60%
Effective income tax rate, percent		(45.20%)	(36.80%)

[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.