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Income Taxes (Details)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]    
Federal statutory rate 21.00% 21.00%
State tax (net of federal tax effect) 4.80% 4.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent [1] (25.90%) (33.10%)
Plant regulatory differences (b) [2] (5.60%) (5.50%)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent (0.60%) (1.60%)
Other (net) 0.40% (0.10%)
Effective income tax rate (5.90%) (14.50%)
[1] Wind PTCs net of estimated transfer discounts are generally 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.