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Income Taxes | 6 Months Ended
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Jun. 30, 2024
Income Tax Disclosure [Abstract] |
Income Taxes | Reconciliation between the statutory rate and ETR:
|  | Three Months Ended June 30 |  | Six Months Ended June 30
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State tax (net of federal tax effect) |  | 5.1 |  |  | 5.1 |  |  | 4.9 |  |  | 4.9 |
(Decreases) increases: |  |  |  |  |  |  |  |
Wind PTCs (a) |  | (60.3) |  |  | (64.0) |  |  | (36.8) |  |  | (44.1) |
Plant regulatory differences (b) |  | (7.0) |  |  | (6.3) |  |  | (6.0) |  |  | (5.8) |
Other tax credits, net operating loss & tax credit allowances |  | (1.3) |  |  | (1.4) |  |  | (0.8) |  |  | (1.5) |
Other, net |  | 1.4 |  |  | 1.6 |  |  | 0.7 |  |  | 0.5 |
Effective income tax rate |  | (41.1) | % |  | (44.0) | % |  | (17.0) | % |  | (25.0) | %
(a)Wind 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.

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