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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

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-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

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-Paragraph 13

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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.



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Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

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Period end amount of total gross PPE.

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