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REGULATORY ENVIRONMENT - WI 2020 AND 2021 RATES - MARCH APPLICATION (Details) - Public Service Commission of Wisconsin (PSCW) - March 2019 Rate Application $ in Millions | 1 Months Ended
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Mar. 31, 2019 USD ($) utility solar_projects
WE | 2020 and 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 10.35%
Requested common equity component average (as a percent) | 52.00%
WE | Electric rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 83
Requested rate increase (as a percent) | 2.90%
WE | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | $ 94
WE | Electric rates | 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 83
Requested rate increase (as a percent) | 2.90%
WE | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | $ 17
WE | Natural gas rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 15
Requested rate increase (as a percent) | 3.90%
WE | Steam rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 1
Requested rate increase (as a percent) | 4.50%
WG | 2020 and 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 10.30%
Requested common equity component average (as a percent) | 52.00%
WG | Natural gas rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 11
Requested rate increase (as a percent) | 1.80%
WPS | 2020 and 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 10.35%
Requested common equity component average (as a percent) | 52.00%
WPS | Electric rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 49
Requested rate increase (as a percent) | 4.90%
WPS | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | $ 16
WPS | Electric rates | 2020 rates | Earnings sharing mechanisms |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | 21
WPS | Electric rates | 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 49
Requested rate increase (as a percent) | 4.90%
WPS | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | $ 24
WPS | Electric rates | 2020 and 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Number of solar projects | solar_projects | 2
WPS | Natural gas rates | 2020 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 7
Requested rate increase (as a percent) | 2.40%
WPS | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |
Public Utilities, General Disclosures [Line Items] |
Amortization of regulatory liabilities | $ 7
WPS | Natural gas rates | 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase | $ 7
Requested rate increase (as a percent) | 2.40%
WE, WG, and WPS | 2020 and 2021 rates |
Public Utilities, General Disclosures [Line Items] |
Number of utilities with earnings sharing mechanism | utility | 3
Percentage of first 25 basis points of additional earnings retained by the utility | 100.00%
Return on equity in excess of authorized amount (as a percent) | 0.25%
Percentage of additional earnings between 25 and 75 basis points refunded to customers | 50.00%
Return on equity in excess of first 25 basis points above authorized amount (as a percent) | 0.50%
Percentage of earnings in excess of 75 basis points refunded to customers | 100.00%

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