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Construction Program and Jointly-Owned Electric Generating Plants Construction Program and Jointly-Owned Electric Generating Plants (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Construction Expenditures | $ 326,931 |  | $ 281,488 | $ 288,031
Public Utilities, Property, Plant and Equipment, Plant in Service | 5,120,167 |  | 4,860,614 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 1,705,520 |  | 1,626,693 |
Operating Lease, Extended term | 6 years |  |  |
Public Service Company of New Mexico [Member] |  |  |  |
Construction Expenditures | 251,345 |  | 226,766 | 256,769
Public Utilities, Property, Plant and Equipment, Plant in Service | 4,009,873 |  | 3,818,722 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 1,305,754 |  | 1,259,957 |
Texas-New Mexico Power Company [Member] |  |  |  |
Construction Expenditures | 67,407 |  | 41,018 | 53,063
Public Utilities, Property, Plant and Equipment, Plant in Service | 947,327 |  | 885,325 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 323,123 |  | 302,333 |
Joint Projects [Member] | PNMR [Member] |  |  |  |
Construction Expenditures | 326,900 |  |  |
Joint Projects [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Construction Expenditures | 251,300 |  |  |
Joint Projects [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Construction Expenditures | 67,400 |  |  |
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 151,169 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 102,229 |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 6,575 |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 13.00% |  |  |
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 | 57,500 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 12,750 |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 2,327 |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.30% |  |  |
Megawatt | 185,000 |  |  |
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 | 944,477 |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 401,263 |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 20,678 |  |  |
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 | 471,301 | [1] |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 122,707 | [1] |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | $ 37,200 | [1] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 10.20% | [1] |  |
Operating Lease, Original term | 40 years |  |  |
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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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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