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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $) |  |  |  |  | 9 Months Ended |  |  | 9 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Sep. 30, 2012 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Dec. 31, 2011 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Sep. 30, 2012 Loss on Long-term Purchase Commitment [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Loss on Long-term Purchase Commitment [Member] Surface [Member] San Juan Generating Station And Four Corners [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Loss on Long-term Purchase Commitment [Member] Underground [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Jul. 31, 2012 Transmissions Issues [Member] Public Service Company of New Mexico [Member] | Aug. 31, 2010 Transmissions Issues [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 TGP Granada, LLC and its affiliate Complaint [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 TGP Granada, LLC and its affiliate Complaint [Member] Tortoise Capital Resources Corporation [Member] | Apr. 30, 2012 Fuel and Purchased Power Adjustment Clause [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Apr. 30, 2010 Water Supply [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Nuclear Plant [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Nuclear Plant [Member] Maximum [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Nuclear Plant [Member] Commercial Providers [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Nuclear Plant [Member] Industry Wide Retrospective Assessment Program [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Oct. 31, 2012 Subsequent Event [Member] Public Service Company of New Mexico [Member]
Public Utilities, Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets | $ 38,467,000 | $ 33,397,000 | $ 33,144,000 | $ 26,776,000 |  | $ 10,700,000 | $ 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Underground Coal Mine Reclamation Payments In Future Dollars |  |  |  |  |  |  |  |  |  |  | 49,800,000 |  |  | 21,500,000 |  |  |  |  |  |  |  |  |  |  |
Other Deferred (Credits) Liability |  |  |  |  |  |  |  |  | (23,500,000) | (26,500,000) |  | (4,400,000) | (4,200,000) |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Estimated Initial Funding Requirements |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Estimated Initial Funding Requirements, Additional to be Funded |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final Reclamation, capped amount to be collected |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preliminary estimate increased deferral related to mine fire incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,300,000 |  |  |  |  |  |
Public Utilities, Liability Insurance Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,600,000,000 | 375,000,000 | 12,200,000,000 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  |  |  |
Litigation Settlement, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 200,000 |  |  |  |  |  |  |  |  |
Public Utilities, Lease ownership percentage in EIP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% | 40.00% |  |  |  |  |  |  |
Public Utilites, Option to renew portion of current EIP lease payments for maximum term to be calculated at end of initial lease term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,700,000
Public Utilities, Inventories of previously mined coal available to supply the fuel requirements |  |  |  |  | 8 months 15 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Signed an agreement with cities to provide cooling water essential to power production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |

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