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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Revolving credit facilities |  |
Short-term credit capacity | $ 3,900.0 |
Available capacity under existing credit facility | 1,968.4 |
Letter of credit |  |
Revolving credit facilities |  |
Letters of credit issued inside credit facilities | 2.3 |
Commercial paper |  |
Revolving credit facilities |  |
Commercial paper outstanding | 1,929.3 | $ 1,921.3
WE | Credit facility maturing August 2030 |  |
Revolving credit facilities |  |
Short-term credit capacity | 800.0 |
PGL | Credit facility maturing August 2030 |  |
Revolving credit facilities |  |
Short-term credit capacity | 600.0 |
WPS | Credit facility maturing August 2030 |  |
Revolving credit facilities |  |
Short-term credit capacity | 450.0 |
WG | Credit facility maturing August 2030 |  |
Revolving credit facilities |  |
Short-term credit capacity | 350.0 |
WEC Energy Group | Credit facility maturing August 2030 |  |
Revolving credit facilities |  |
Short-term credit capacity | $ 1,700.0 |

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