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Regulatory Environment - WI 2020 and 2021 Rates (Details) $ in Millions | 1 Months Ended |
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May 31, 2021 USD ($) | Dec. 31, 2019 USD ($) utility | Dec. 31, 2023
WEPCo Environmental Trust Finance I, LLC | WEPCo Environmental Trust Bonds 1.578%, due 2035 |  |  |
Public Utilities, General Disclosures |  |  |
Interest rate |  |  | 1.58%
Public Service Commission of Wisconsin (PSCW) | WEPCo Environmental Trust Finance I, LLC | Electric | WEPCo Environmental Trust Bonds 1.578%, due 2035 |  |  |
Public Utilities, General Disclosures |  |  |
Proceeds from Issuance of Debt | $ 118.8 |  |
Interest rate | 1.578% |  |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates |  |  |
Public Utilities, General Disclosures |  |  |
Number of utilities filing rate request | utility |  | 3 |
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% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Electric | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization period |  | 2 years |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Number of utilities filing rate request | utility |  | 3 |
Amortization period |  | 4 years |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WE |  |  |
Public Utilities, General Disclosures |  |  |
Approved return on equity (as a percent) |  | 10.00% |
Approved common equity component average (as a percent) |  | 52.50% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WE | Electric |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ 15.3 |
Approved rate increase (as a percent) |  | 0.50% |
Pleasant Prairie power plant's book value to be securitized |  | $ 100.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WE | Natural gas |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ 10.4 |
Approved rate increase (as a percent) |  | 2.80% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WE | Steam |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ 1.9 |
Approved rate increase (as a percent) |  | 8.60% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WPS |  |  |
Public Utilities, General Disclosures |  |  |
Approved return on equity (as a percent) |  | 10.00% |
Approved common equity component average (as a percent) |  | 52.50% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WPS | Electric |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ 15.8 |
Approved rate increase (as a percent) |  | 1.60% |
Authorized revenue requirement for ReACT |  | $ 275.0 |
Cost of the ReACT project, excluding AFUDC |  | $ 342.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WPS | Electric | ReACT |  |  |
Public Utilities, General Disclosures |  |  |
Recovery period of regulatory asset |  | 8 years |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WPS | Electric | Earnings sharing mechanisms |  |  |
Public Utilities, General Disclosures |  |  |
Amortization period |  | 2 years |
Amortization of regulatory liabilities |  | $ 21.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WPS | Natural gas |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ 4.3 |
Approved rate increase (as a percent) |  | 1.40% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WG |  |  |
Public Utilities, General Disclosures |  |  |
Approved return on equity (as a percent) |  | 10.20% |
Approved common equity component average (as a percent) |  | 52.50% |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | WG | Natural gas |  |  |
Public Utilities, General Disclosures |  |  |
Approved rate increase |  | $ (1.5) |
Approved rate increase (as a percent) |  | (0.20%) |
Public Service Commission of Wisconsin (PSCW) | 2020 rates | WE | Electric | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | $ 65.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 rates | WE | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | (5.0) |
Public Service Commission of Wisconsin (PSCW) | 2020 rates | WPS | Electric | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 11.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 rates | WPS | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 5.0 |
Public Service Commission of Wisconsin (PSCW) | 2020 rates | WG | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 3.0 |
Public Service Commission of Wisconsin (PSCW) | 2021 rates | WE | Electric | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 65.0 |
Public Service Commission of Wisconsin (PSCW) | 2021 rates | WE | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | (5.0) |
Public Service Commission of Wisconsin (PSCW) | 2021 rates | WPS | Electric | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 39.0 |
Public Service Commission of Wisconsin (PSCW) | 2021 rates | WPS | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | 5.0 |
Public Service Commission of Wisconsin (PSCW) | 2021 rates | WG | Natural gas | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures |  |  |
Amortization of regulatory liabilities |  | $ 3.0 |

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