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Construction Program and Jointly-Owned Electric Generating Plants - Schedule of Interests and Investments in Jointly-Owned Generating Facilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Jan. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 10,697,774 |  | $ 9,701,180
Accumulated depreciation | 2,829,296 |  | 2,755,823
PNM |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | 6,797,493 |  | 6,151,510
Accumulated depreciation | 2,079,363 |  | $ 1,976,657
PVNGS (Nuclear) | PNM |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | 800,999 |  |
Accumulated depreciation | 415,747 |  |
Construction Work in Progress | $ 32,650 |  |
Composite Interest | 7.29% | 7.30% | 7.60%
Four Corners Units 4 and 5 (Coal) | PNM |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 291,355 |  |
Accumulated depreciation | 98,049 |  |
Construction Work in Progress | $ 14,579 |  |
Composite Interest | 13.00% |  |
Luna (Gas) | PNM |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 99,479 |  |
Accumulated depreciation | 37,448 |  |
Construction Work in Progress | $ 2,658 |  |
Composite Interest | 33.33% |  |

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