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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]        
Federal statutory rate 21.00% 21.00% 21.00% 21.00%
State tax (net of federal tax effect) 4.90% 5.00% 4.90% 5.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent [1] (12.30%) (12.10%) (25.20%) (20.00%)
Plant regulatory differences (b) [2] (5.80%) (5.80%) (5.50%) (6.00%)
Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback, Percent (1.20%) (1.20%) (1.40%) (1.10%)
Other (net) (0.30%) (0.30%) (0.10%) (0.20%)
Effective income tax rate 6.30% 6.60% (6.30%) (1.30%)
[1] Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income
[2] Regulatory differences for income tax primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred taxes are offset by corresponding revenue reductions.