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Income Taxes
 3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Income Taxes
Reconciliation between the statutory rate and ETR:
Three Months Ended March 31
20252024
Federal statutory rate21.0 %21.0 %
State income tax on pretax income, net of federal tax effect4.7 4.8 
(Decreases) increases:
PTCs (a)
(33.1)(25.9)
Plant regulatory differences (b)
(6.7)(5.6)
Other tax credits, net operating loss & tax credit allowances(1.2)(0.6)
Other, net0.8 0.4 
Effective income tax rate(14.5)%(5.9)%
(a)Wind and solar PTCs (net of estimated transfer discounts) are generally credited to customers (reduction to revenue) and do not materially impact net income.
(b)Plant regulatory differences primarily relate to the credit of excess deferred taxes to customers. Income tax benefits associated with the credit are offset by corresponding revenue reductions.