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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation of the statutory federal income tax rate to our effective tax rate for each of the three and nine months ended September 30, 2021 and 2020 is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Federal Statutory Rate | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Increases (Decreases) in Tax from: |  |  |  |  |  |  |
State Taxes on Income, Net of Federal Tax | 5.0 |  |  | 5.0 |  |  | 5.0 |  |  | 5.0 |
Production Tax Credits (PTCs) | (5.0) |  |  | — |  |  | (6.0) |  |  | — |
Amortization of Excess Deferred Income Taxes | (1.6) |  |  | (2.9) |  |  | (2.0) |  |  | (3.4) |
North Dakota Wind Tax Credit Amortization, Net of Federal Tax | (0.2) |  |  | (0.6) |  |  | (0.3) |  |  | (0.8) |
Excess Tax Deduction on Stock Awards | — |  |  | 0.3 |  |  | — |  |  | (0.4) |
Allowance for Equity Funds Used During Construction | (0.1) |  |  | (0.7) |  |  | (0.1) |  |  | (0.8) |
Other, Net | (0.8) |  |  | (1.9) |  |  | (0.7) |  |  | (1.2) |
Effective Tax Rate | 18.3 | % |  | 20.2 | % |  | 16.9 | % |  | 19.4 | %

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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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