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Variable Interest Entities (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) MW | Mar. 31, 2023 USD ($) | Dec. 05, 2022 MW | Jan. 31, 2016 USD ($)
San Juan Generating Station | Coal supply |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  | $ 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 costs | $ 5.1 | $ 5.0 |  |
Payment for variable costs | $ 0.1 | $ 1.6 |  |
Long-term contract option to purchase, ownership percentage (up to) | 50.00% |  |  |
Long-term contract option to purchase, purchase price - percentage of adjusted NBV | 50.00% |  |  |
Long-term contract option to purchase, purchase price - percentage of FMV | 50.00% |  |  |
PNM | Purchased through May 2028 | Valencia |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of megawatts purchased (in megawatts) | MW | 155 |  |  |

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