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Commitments and Contingencies (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended
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Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Oct. 31, 2010 Public Service Company of New Mexico [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Maximum [Member] Nuclear Plant [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Commercial Providers [Member] Nuclear Plant [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Industry Wide Retrospective Assessment Program [Member] Nuclear Plant [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Plant [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Other Deferred Credits [Member] Nuclear Spent Fuel And Waste Disposal [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Other Deferred Credits [Member] Nuclear Spent Fuel And Waste Disposal [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Spent Fuel And Waste Disposal [Member] | Jan. 06, 2010 Public Service Company of New Mexico [Member] Maximum [Member] San Juan Generating Station And Four Corners [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Maximum [Member] San Juan Generating Station [Member] | May 17, 2010 Public Service Company of New Mexico [Member] Maximum [Member] Citizen Suit Under the Clean Air Act [Member] | May 17, 2010 Public Service Company of New Mexico [Member] Maximum [Member] Mercury Control [Member] | Jan. 06, 2010 Public Service Company of New Mexico [Member] Minimum [Member] San Juan Generating Station And Four Corners [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Minimum [Member] San Juan Generating Station [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Surface [Member] San Juan Generating Station And Four Corners [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2010 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2010 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Underground [Member] San Juan Generating Station [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Underground [Member] Loss on Long-term Purchase Commitment [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Underground [Member] Loss on Long-term Purchase Commitment [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Coal Supply [Member] tons | Sep. 30, 2011 Public Service Company of New Mexico [Member] Coal Supply [Member] San Juan Generating Station [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Coal Supply [Member] San Juan Generating Station [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Clean Air Act related to SCR [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Clean Air Act Related to Sncr [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Four Corners [Member] | Feb. 10, 2011 Public Service Company of New Mexico [Member] Four Corners [Member] | Nov. 08, 2010 Public Service Company of New Mexico [Member] Four Corners [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Four Corners [Member] Clean Air Act related to Post-Combustion Controls [Member] | Jan. 31, 2011 Public Service Company of New Mexico [Member] Transmissions Issues [Member] | Sep. 30, 2011 Maximum [Member] Settlement Related To Gila River Indian Reservation Superfund Site [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  | $ 42,800,000 |  |  | $ 42,000,000 | $ 47,000,000 |  |  | $ 53,400,000 |  |  |  |  |  | $ 21,700,000 |  |  |  |  |  |  |  | $ 77,000,000 |  |  |  | $ 69,000,000 |  |
Public Utilities, Proposed Stack Opacity Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10 |  |  |  |  |
Loss Contingency Accrual, at Carrying Value |  |  |  |  |  |  |  |  |  | 14,500,000 | 14,800,000 |  |  |  |  |  |  |  |  | 23,700,000 |  | 23,700,000 |  | 25,000,000 |  | 3,000,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000,000 |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.30% |  |  |  |  |  |  |  |
Public Utilities, Government Proposed Emission Limit (pounds be MMBTU) |  |  |  |  | 0.11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.05 |  |  | 0.098 | 0.098 |  |  |  |
Public Utilities, Government Standard Emission Limit (pounds per MMBTU, parts per million) |  |  | 0.23 |  |  |  |  |  |  |  |  |  | 0.070 |  |  |  | 0.060 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.05 |  |  |  |  |  |  |  |
Public Utilities, Estimated Construction |  |  |  |  |  |  |  |  |  |  |  |  |  | 897,000,000 |  |  |  | 749,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance For Funds Used During Construction |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Annual Increase in Costs Per Customer |  |  | 85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Proposed Opacity Limit Fugitive Dust Emission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |
Public Utilties, Jointly Owned Utility Plant, Sale of Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |
Other current assets | 49,043,000 | 96,110,000 | 41,653,000 | 46,635,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,800,000 | 30,900,000 |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment, Minimum Quantity Required (tons of coal) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,200,000 |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Carrying Value, Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 | 900,000 | 3,600,000 | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Liability Insurance Coverage |  |  |  |  |  | 12,600,000,000 | 375,000,000 | 12,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Assessment Per Reactor For Each Incident |  |  |  |  |  |  |  |  | 117,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Assessment Per Reactor For Each Incident, Annual Limit |  |  |  |  |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Ownership Percentage in Nuclear Reactor |  |  |  |  |  |  |  |  | 10.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Potential Assessment Per Incident |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Annual Payment Limitation Related to Incident |  |  |  |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Aggregate Amount of All Risk Insurance |  |  |  |  |  |  |  |  | 2,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Amount under Nuclear Electir Insurance Limited |  |  |  |  |  |  |  |  | 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 100,000

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