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REGULATORY ENVIRONMENT - 2023 MERC RATE ORDER (Details) - Minnesota Public Utilities Commission (MPUC) - MERC - USD ($) $ in Millions | 1 Months Ended
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Nov. 30, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |
Interim rate increase |  | $ 37.0
Approved rate increase | $ 28.8 |
Approved rate increase (as a percent) | 7.10% |
Approved return on equity (as a percent) | 9.65% |
Approved common equity component average (as a percent) | 53.00% |
Revenue Subject to Refund |  |
Public Utilities, General Disclosures [Line Items] |  |
Interim rate refunds made to customers | $ 8.9 |

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