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Construction Program and Jointly-Owned Electric Generating Plants Construction Program and Jointly-Owned Electric Generating Plants (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Construction Expenditures | $ 308,909,000 |  | $ 326,931,000 | $ 281,488,000
Public Utilities, Property, Plant and Equipment, Plant in Service | 5,313,796,000 |  | 5,120,167,000 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (1,774,223,000) |  | (1,705,520,000) |
Operating Lease, Extended Term | 2 years |  |  |
Public Service Company of New Mexico [Member] |  |  |  |
Construction Expenditures | 196,800,000 |  | 251,345,000 | 226,766,000
Public Utilities, Property, Plant and Equipment, Plant in Service | 4,133,532,000 |  | 4,009,873,000 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (1,355,240,000) |  | (1,305,754,000) |
Texas-New Mexico Power Company [Member] |  |  |  |
Construction Expenditures | 92,973,000 |  | 67,407,000 | 41,018,000
Public Utilities, Property, Plant and Equipment, Plant in Service | 1,009,108,000 |  | 947,327,000 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (339,315,000) |  | (323,123,000) |
Joint Projects [Member] | PNMR [Member] |  |  |  |
Construction Expenditures | 308,900,000 |  |  |
Joint Projects [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Construction Expenditures | 196,800,000 |  |  |
Joint Projects [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Construction Expenditures | 93,000,000 |  |  |
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 152,873,000 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (100,010,000) |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 5,988,000 |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 13.00% |  |  |
Environmental Upgrades Requirement Estimates | 71,900,000 |  |  |
Luna (Gas) [Member] | Other Unrelated Entities 8 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.30% |  |  |
Luna (Gas) [Member] | Other Unrelated Entities 9 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.30% |  |  |
Luna (Gas) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 62,778,000 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (15,195,000) |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 117,000 |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.33% |  |  |
SJGS Units 1 and 2 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 1 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 41.80% |  |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 2 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 8.20% |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 3 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 28.80% |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 4 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 10.04% |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 5 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 8.475% |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 6 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 7.20% |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 7 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 7.028% |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 978,575,000 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (401,866,000) |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 19,144,000 |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 46.30% |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 3 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 4 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 38.457% |  |  |
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 489,425,000 | [1] |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (132,781,000) | [1] |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | $ 41,134,000 | [1] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 10.20% | [1] |  |
Operating Lease, Original term | 40 years |  |  |
Number of operating units | 3 |  |  |
Operating Lease, Extended Term | 20 years |  |  |
[1] | (1) Includes interest in PVNGS Unit 3, interest in common facilities for all PVNGS units, and owned interests in PVNGS Units 1 and 2.

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