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Long-Term Debt - Maturities of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Long-term debt maturing within one year |  |
2025 | $ 1,729.0 |
2026 | 1,519.4 |
2027 | 2,137.3 |
2028 | 2,303.2 |
2029 | 2,643.4 |
Thereafter | 8,691.6 |
Total | $ 19,023.9 | $ 16,724.3
MGU | 2.69% MGU Senior Notes due May 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 2.69% |
Principal amount of unsecured debt | $ 60.0 |
MERC | 2.69% MERC Senior Notes due May 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 2.69% |
Principal amount of unsecured debt | $ 50.0 |
WE | 3.10% WE Debentures due June 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 3.10% |
Principal amount of unsecured debt | $ 250.0 |
WG | 3.53% WG Debentures due September 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 3.53% |
Principal amount of unsecured debt | $ 200.0 |
WPS | 5.35% WPS Senior Notes due November 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 5.35% |
Principal amount of unsecured debt | $ 300.0 |
ATC Holding LLC | 4.18% ATC Senior Notes due December 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 4.18% |
Principal amount of unsecured debt | $ 85.0 |
WEPCo Environmental Trust Finance I, LLC | WEPCo Environmental Trust Bonds 1.578%, due 2035 |  |
Long-term debt maturing within one year |  |
Interest rate | 1.58% |
Principal amount of secured debt | $ 9.2 |
Bluewater Gas Storage | 3.76% Bluewater Gas Storage senior notes |  |
Long-term debt maturing within one year |  |
Interest rate | 3.76% |
Principal amount of senior notes | $ 3.0 |
Bluewater Gas Storage | 5.41% Bluewater Senior Notes due 11/01/2041 |  |
Long-term debt maturing within one year |  |
Interest rate | 5.41% |
Principal amount of senior notes | $ 0.9 |
We Power | 4.91% We Power subsidiaries notes - PWGS |  |
Long-term debt maturing within one year |  |
Interest rate | 4.91% |
Principal amount of secured debt | $ 8.4 |
We Power | 5.209% We Power subsidiaries notes - ERGS |  |
Long-term debt maturing within one year |  |
Interest rate | 5.209% |
Principal amount of secured debt | $ 16.3 |
We Power | 4.673% We Power subsidiaries notes - ERGS |  |
Long-term debt maturing within one year |  |
Interest rate | 4.673% |
Principal amount of secured debt | $ 12.2 |
We Power | 6.00% We Power subsidiaries notes - PWGS |  |
Long-term debt maturing within one year |  |
Interest rate | 6.00% |
Principal amount of secured debt | $ 7.5 |
WECI Wind Holding I | 2.75% WECI Wind Holding I senior notes due 2032 |  |
Long-term debt maturing within one year |  |
Interest rate | 2.75% |
Principal amount of senior notes | $ 44.4 |
WECI Wind Holding II | 6.38% WECI Wind Holding II LLC Senior Notes Due 2031 |  |
Long-term debt maturing within one year |  |
Interest rate | 6.38% |
Principal amount of senior notes | $ 19.6 |
WECI Energy Holding III | 5.73% WECI Energy Holding III LLC Senior Notes Due 12/31/2039 |  |
Long-term debt maturing within one year |  |
Interest rate | 5.73% |
Principal amount of senior notes | $ 42.5 |
WEC Energy Group |  |
Long-term debt maturing within one year |  |
2025 | 620.0 |
2026 | 1,350.0 |
2027 | 1,762.5 |
2028 | 950.0 |
2029 | 862.5 |
Thereafter | $ 1,250.0 |
WEC Energy Group | 3.55% WEC Senior Notes due June 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 3.55% |
Principal amount of unsecured debt | $ 120.0 |
WEC Energy Group | 5.00% WEC Senior Notes due September 2025 |  |
Long-term debt maturing within one year |  |
Interest rate | 5.00% |
Principal amount of unsecured debt | $ 500.0 |

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