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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
--- | ---
Dec. 31, 2015 USD ($) operating_unit | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Construction expenditures | $ 558,589 | $ 460,658 | $ 348,039
Plant in Service | 6,307,261 | 5,941,581 |
Accumulated Depreciation | (2,058,772) | (1,939,760) |
Regulatory Disallowance | $ 167,471 | 1,062 | 12,235
Operating lease, option term extensions | 2 years |  |
Public Service Company of New Mexico [Member] |  |  |
Construction expenditures | $ 404,840 | 316,800 | 239,906
Plant in Service | 4,833,303 | 4,581,066 |
Accumulated Depreciation | (1,569,549) | (1,486,406) |
Regulatory Disallowance | 167,471 | 1,062 | 12,235
Texas-New Mexico Power Company [Member] |  |  |
Construction expenditures | 124,584 | 127,191 | $ 89,117
Plant in Service | 1,285,727 | 1,182,112 |
Accumulated Depreciation | (406,516) | $ (375,407) |
Joint Projects [Member] | Public Service Company of New Mexico [Member] |  |  |
Construction expenditures | 404,800 |  |
Joint Projects [Member] | Texas-New Mexico Power Company [Member] |  |  |
Construction expenditures | 124,600 |  |
Joint Projects [Member] | PNMR [Member] |  |  |
Construction expenditures | 558,600 |  |
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] |  |  |
Plant in Service | 468,200 |  |
Accumulated Depreciation | (193,300) |  |
Construction Work in Progress | 2,200 |  |
Net book value | $ 277,100 |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 1 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 41.80% |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 2 [Member] |  |  |
Composite Interest | 8.20% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 3 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 28.80% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 4 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 10.04% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 5 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 8.475% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 6 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 7.20% |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 7 [Member] |  |  |
Jointly owned utility plant, ownership percentage | 7.028% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |
Plant in Service | $ 1,083,331 |  |
Accumulated Depreciation | (428,684) |  |
Construction Work in Progress | $ 20,117 |  |
Composite Interest | 46.30% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 3 [Member] |  |  |
Composite Interest | 50.00% |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 4 [Member] |  |  |
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, future proportionate ownership share | 12.80% |  |
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member] |  |  |
Plant in Service | $ 562,412 |  |
Accumulated Depreciation | (164,549) |  |
Construction Work in Progress | $ 38,966 |  |
Composite Interest | 10.20% |  |
Period of time for the original full power operating licenses | 40 years |  |
Number of operating units | operating_unit | 3 |  |
Operating lease, option term extensions | 20 years |  |
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |
Plant in Service | $ 167,874 |  |
Accumulated Depreciation | (102,559) |  |
Construction Work in Progress | $ 19,390 |  |
Composite Interest | 13.00% |  |
Luna (Gas) [Member] | Public Service Company of New Mexico [Member] |  |  |
Plant in Service | $ 69,259 |  |
Accumulated Depreciation | (23,048) |  |
Construction Work in Progress | $ 33 |  |
Composite Interest | 33.33% |  |
SJGS Units 1 and 2 [Member] | Public Service Company of New Mexico [Member] |  |  |
Composite Interest | 50.00% |  |
Clean Air Act, SNCR [Member] | Public Service Company of New Mexico [Member] |  |  |
Regulatory Disallowance | $ 21,600 |  |
Clean Air Act, SNCR [Member] | San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] |  |  |
Regulatory Disallowance | $ 127,600 |  |

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