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RATE MATTERS - I&M Rate Matters (Details) - I&M - USD ($) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 29, 2025 | Jul. 30, 2025 | Oct. 31, 2024 | Jul. 31, 2025 | Apr. 30, 2025 | Jan. 31, 2025
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Earning test, over-earning credit to customers, proposed |  |  |  | $ 35,000 |  | $ 21,000
Earning test, over-earning credit to customers, approved |  |  |  |  | $ 21,000 |
2023 Michigan Power Supply Cost Recovery |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended disallowance purchased power |  | $ 3,000 |  |  |  |
2023 Michigan Power Supply Cost Recovery | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended disallowance purchased power |  |  | $ 3,000 |  |  |
2023 Michigan Power Supply Cost Recovery | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended disallowance purchased power |  |  | $ 15,000 |  |  |
2024 Michigan Power Supply Cost Recovery | Minimum | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended disallowance purchased power | $ 259 |  |  |  |  |
2024 Michigan Power Supply Cost Recovery | Maximum | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public utilities, recommended disallowance purchased power | $ 14,000 |  |  |  |  |

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