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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | 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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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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