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Income Taxes | 9 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Income Taxes | Reconciliation between the statutory rate and ETR:
|  | Three Months Ended Sept. 30 |  | Nine Months Ended Sept. 30
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income tax on pretax income, net of federal tax effect |  | 5.2 |  |  | 4.7 |  |  | 4.9 |  |  | 4.8 |
(Decreases) increases: |  |  |  |  |  |  |  |
PTCs (a) |  | (17.0) |  |  | (16.0) |  |  | (27.0) |  |  | (26.2) |
Plant regulatory differences (b) |  | (8.2) |  |  | (5.7) |  |  | (7.2) |  |  | (5.9) |
Other tax credits, net operating loss & tax credit allowances |  | (0.4) |  |  | (1.5) |  |  | (0.9) |  |  | (1.1) |
Other, net |  | 0.9 |  |  | (1.1) |  |  | 0.8 |  |  | (0.3) |
Effective income tax rate |  | 1.5 | % |  | 1.4 | % |  | (8.4) | % |  | (7.7) | %
(a)Wind and solar PTCs (net of estimated transfer discounts) are generally credited to customers (reduction to revenue) and do not materially impact earnings. (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.

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