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Variable Interest Entities - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 05, 2022 MW | Jan. 31, 2016 USD ($)
Coal Supply | San Juan Generating Station |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Issuance in letters of credit |  |  |  |  | $ 30.3
PNM |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW |  |  |  | 64.1 |
PNM | Valencia |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Payment for fixed charges | $ 20.5 | $ 20.3 | $ 19.5 |  |
Payment for variable charges | $ 2.4 | $ 5.2 | $ 1.9 |  |
Option to purchase a percentage of the plant or VIE (up to ) | 50.00% |  |  |  |
Purchase price, percentage of the book value reduced by related indebtedness | 50.00% |  |  |  |
Purchase price, percentage of fair market value | 50.00% |  |  |  |
PNM | Valencia | Purchased Through May 30, 2028 |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW | 155 |  |  |  |

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