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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2022
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Reconciliation between the statutory rate and ETR:
|  | Three Months Ended June 30 |  | Six Months Ended June 30
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State tax (net of federal tax effect) |  | 5.2 |  |  | 4.9 |  |  | 5.0 |  |  | 4.9 |
Decreases: |  |  |  |  |  |  |  |
Wind PTCs (a) |  | (48.3) |  |  | (33.1) |  |  | (40.4) |  |  | (28.4) |
Plant regulatory differences (b) |  | (5.5) |  |  | (6.6) |  |  | (5.1) |  |  | (6.3) |
Other tax credits, net operating loss & tax credits allowances |  | (1.4) |  |  | (1.0) |  |  | (1.5) |  |  | (1.1) |
Other (net) |  | (0.1) |  |  | 0.9 |  |  | (0.2) |  |  | 0.1 |
Effective income tax rate |  | (29.1) | % |  | (13.9) | % |  | (21.2) | % |  | (9.8) | %
(a)Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income. (b)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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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