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REGULATORY ASSETS AND LIABILITIES - PLANT RETIREMENTS (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Oak Creek Power Plant Units 5 and 6 |  |
Regulatory assets | $ 3,405.6 | $ 3,274.7
Regulatory liability | 3,921.6 | 3,745.2
Removal costs |  |
Oak Creek Power Plant Units 5 and 6 |  |
Regulatory liability | 1,429.5 | 1,329.9
Plant retirement related items |  |
Oak Creek Power Plant Units 5 and 6 |  |
Regulatory assets | 814.3 | $ 646.2
Oak Creek Power Plant Units 5 and 6 |  |
Oak Creek Power Plant Units 5 and 6 |  |
Deferred tax liabilities | 9.0 |
Oak Creek Power Plant Units 5 and 6 | Removal costs |  |
Oak Creek Power Plant Units 5 and 6 |  |
Regulatory liability | 43.8 |
Oak Creek Power Plant Units 5 and 6 | Plant retirement related items |  |
Oak Creek Power Plant Units 5 and 6 |  |
Regulatory assets | $ 76.8 |

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