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Construction Program and Jointly-Owned Electric Generating Plants - Construction Program and Jointly-Owned Electric Generating Plants (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) generating_unit | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | $ 600,076 | $ 558,589 | $ 460,658
Plant in Service | 6,944,534 | 6,307,261 |
Accumulated Depreciation | (2,334,938) | (2,058,772) |
Regulatory disallowance | $ 15,011 | 167,471 | 1,062
Operating lease, option term extensions | 2 years |  |
Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | $ 445,464 | 404,840 | 316,800
Plant in Service | 5,359,211 | 4,833,303 |
Accumulated Depreciation | (1,809,528) | (1,569,549) |
Regulatory disallowance | 15,011 | 167,471 | 1,062
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Regulatory disallowance |  | 21,600 |
Texas-New Mexico Power Company [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 122,518 | 124,584 | $ 127,191
Plant in Service | 1,380,584 | 1,285,727 |
Accumulated Depreciation | (429,397) | (406,516) |
Joint Projects [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 445,500 |  |
Joint Projects [Member] | Texas-New Mexico Power Company [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | 122,500 |  |
Joint Projects [Member] | PNMR [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Construction expenditures | $ 600,100 |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 1 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 41.80% |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 2 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 8.20% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 3 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 28.80% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 4 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 10.04% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 5 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 8.475% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 6 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 7.20% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 7 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, ownership percentage | 7.028% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 1,082,537 |  |
Accumulated Depreciation | (445,597) |  |
Construction Work in Progress | $ 4,406 |  |
Composite Interest | 46.30% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 3 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 50.00% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 4 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 38.457% |  |
Jointly owned utility plant, future proportionate ownership share | 64.50% |  |
SJGS (Coal) [Member] | PNMR Development [Member] | Unit 4 [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Jointly owned utility plant, future proportionate ownership share | 12.80% |  |
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 797,793 |  |
Accumulated Depreciation | (334,887) |  |
Construction Work in Progress | $ 38,946 |  |
Composite Interest | 10.20% |  |
Period of time for the original full power operating licenses | 40 years |  |
Number of units (in generating units) | generating_unit | 3 |  |
Operating lease, option term extensions | 20 years |  |
Four Corners [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Number of units (in generating units) | generating_unit | 2 |  |
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 188,026 |  |
Accumulated Depreciation | (103,584) |  |
Construction Work in Progress | $ 52,869 |  |
Composite Interest | 13.00% |  |
Luna (Gas) [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 69,678 |  |
Accumulated Depreciation | (25,386) |  |
Construction Work in Progress | $ 259 |  |
Composite Interest | 33.33% |  |
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Plant in Service | $ 471,800 | 468,200 |
Accumulated Depreciation | (203,900) | (193,300) |
Construction Work in Progress |  | 2,200 |
Net book value | $ 267,900 | 277,100 |
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Regulatory disallowance |  | $ 127,600 |
SJGS Units 1 and 2 [Member] | Public Service Company of New Mexico [Member] |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Composite Interest | 50.00% |  |

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