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Construction Program and Jointly-Owned Electric Generating Plants (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 MW | Jan. 31, 2023 MW | Dec. 31, 2023 USD ($) generatingUnit | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | $ 1,075,812 | $ 912,557 | $ 935,016
Plant in Service |  |  | 9,701,180 | 9,164,564 |
Accumulated Depreciation |  |  | 2,755,823 | 2,659,952 |
PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 565,080 | 433,459 | 602,180
Plant in Service |  |  | 6,151,510 | 6,007,464 |
Accumulated Depreciation |  |  | 1,976,657 | 1,908,644 |
TNMP |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 464,436 | 449,534 | $ 311,909
Plant in Service |  |  | 3,210,870 | 2,853,130 |
Accumulated Depreciation |  |  | 582,140 | $ 578,157 |
Joint Projects | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 565,100 |  |
Joint Projects | TNMP |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 464,400 |  |
Joint Projects | PNMR |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 1,075,800 |  |
Palo Verde Nuclear Generating Station | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Plant in Service |  |  | 800,338 |  |
Accumulated Depreciation |  |  | 403,531 |  |
Construction Work in Progress |  |  | $ 25,380 |  |
Composite Interest |  | 7.60% | 7.56% | 10.20% |
Number of units (in generating units) | generatingUnit |  |  | 3 |  |
Leased capacity | MW |  | 104 |  |  |
Palo Verde Nuclear Generating Station | PNM | Subsequent Event |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Composite Interest | 7.30% |  |  |  |
Leased capacity | MW | 10 |  |  |  |
Four Corners Units 4 and 5 (Coal) | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Plant in Service |  |  | $ 282,875 |  |
Accumulated Depreciation |  |  | 102,520 |  |
Construction Work in Progress |  |  | $ 7,710 |  |
Composite Interest |  |  | 13.00% |  |
Luna (Gas) | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Plant in Service |  |  | $ 85,516 |  |
Accumulated Depreciation |  |  | 34,893 |  |
Construction Work in Progress |  |  | $ 2,826 |  |
Composite Interest |  |  | 33.33% |  |
Four Corners | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Number of units (in generating units) | generatingUnit |  |  | 2 |  |

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