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INCOME TAXES - WI 2020 and 2021 RATES (Details) - Tax Cuts and Jobs Act of 2017 - Public Service Commission of Wisconsin (PSCW) - 2020 and 2021 rates | 1 Months Ended
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Dec. 31, 2019
Electric rates |
Income Taxes [Line Items] |
Amortization period | 2 years
Natural gas rates |
Income Taxes [Line Items] |
Amortization period | 4 years

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