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Construction Program and Jointly-Owned Electric Generating Plants (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 MW | Dec. 31, 2022 USD ($) generatingUnit | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | $ 912,557 | $ 935,016 | $ 679,028
Plant in Service |  | 9,164,564 | 9,357,849 |
Accumulated Depreciation |  | 2,659,952 | 2,952,743 |
Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | 433,459 | 602,180 | 335,055
Plant in Service |  | 6,007,464 | 6,602,015 |
Accumulated Depreciation |  | 1,908,644 | 2,235,068 |
Texas-New Mexico Power Company |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | 449,534 | 311,909 | $ 321,505
Plant in Service |  | 2,853,130 | 2,475,859 |
Accumulated Depreciation |  | 578,157 | $ 563,004 |
Joint Projects | Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | 433,500 |  |
Joint Projects | Texas-New Mexico Power Company |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | 449,500 |  |
Joint Projects | PNMR |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Construction expenditures |  | 912,600 |  |
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Plant in Service |  | 891,708 |  |
Accumulated Depreciation |  | 420,076 |  |
Construction Work in Progress |  | $ 35,504 |  |
Composite Interest |  | 10.20% |  |
Number of units (in generating units) | generatingUnit |  | 3 |  |
Operating lease, option term extensions |  | 20 years |  |
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico | Subsequent Event |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Composite Interest | 7.60% |  |  |
Leased capacity | MW | 104 |  |  |
Four Corners Units 4 and 5 (Coal) | Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Plant in Service |  | $ 320,376 |  |
Accumulated Depreciation |  | 101,022 |  |
Construction Work in Progress |  | $ 9,390 |  |
Composite Interest |  | 13.00% |  |
Luna (Gas) | Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Plant in Service |  | $ 83,146 |  |
Accumulated Depreciation |  | 33,063 |  |
Construction Work in Progress |  | $ 111 |  |
Composite Interest |  | 33.33% |  |
Four Corners | Public Service Company of New Mexico |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Number of units (in generating units) | generatingUnit |  | 2 |  |

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