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Construction Program and Jointly-Owned Electric Generating Plants (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) generating_unit | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | $ 935,016 | $ 679,028 | $ 616,273
Plant in Service | 9,357,849 | 8,480,799 |
Accumulated Depreciation | 2,952,743 | 2,835,170 |
Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 602,180 | 335,055 | 341,847
Plant in Service | 6,602,015 | 6,022,753 |
Accumulated Depreciation | 2,235,068 | 2,158,915 |
Texas-New Mexico Power Company |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 311,909 | 321,505 | $ 254,006
Plant in Service | 2,475,859 | 2,193,270 |
Accumulated Depreciation | 563,004 | $ 537,707 |
Joint Projects | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 602,200 |  |
Joint Projects | Texas-New Mexico Power Company |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 311,900 |  |
Joint Projects | PNMR |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | $ 935,000 |  |
SJGS (Coal) | Unit 4 | Other Unrelated Entities 2 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 12.80% |  |
SJGS (Coal) | Unit 4 | Other Unrelated Entities 3 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 8.475% |  |
SJGS (Coal) | Unit 4 | Other Unrelated Entities 4 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 7.20% |  |
SJGS (Coal) | Unit 4 | Other Unrelated Entities 5 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 7.028% |  |
SJGS (Coal) | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 815,361 |  |
Accumulated Depreciation | 455,159 |  |
Construction Work in Progress | $ 10 |  |
Composite Interest | 66.35% |  |
SJGS (Coal) | Public Service Company of New Mexico | Unit 4 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 77.297% |  |
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 869,363 |  |
Accumulated Depreciation | 403,764 |  |
Construction Work in Progress | $ 38,770 |  |
Composite Interest | 10.20% |  |
Number of units (in generating units) | generating_unit | 3 |  |
Period of time for the original full power operating licenses | 40 years |  |
Operating lease, option term extensions | 20 years |  |
Four Corners Units 4 and 5 (Coal) | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 316,033 |  |
Accumulated Depreciation | 100,156 |  |
Construction Work in Progress | $ 6,294 |  |
Composite Interest | 13.00% |  |
Luna (Gas) | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 80,159 |  |
Accumulated Depreciation | 31,244 |  |
Construction Work in Progress | $ 46 |  |
Composite Interest | 33.33% |  |
SJGS Units 1 and 2 | Other Unrelated Entities 1 |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 50.00% |  |
SJGS Units 1 and 2 | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 50.00% |  |
Four Corners | Public Service Company of New Mexico |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Number of units (in generating units) | generating_unit | 2 |  |

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