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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $) |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  | 1 Months Ended |  | 3 Months Ended |
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Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Jan. 31, 2011 Public Service Company of New Mexico [Member] Transmissions Issues [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] TGP Granada, LLC and its affiliate Complaint [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Mar. 31, 2011 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] Underground [Member] Loss on Long-term Purchase Commitment [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Underground [Member] Loss on Long-term Purchase Commitment [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Coal Supply [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Coal Supply [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Underground [Member] Loss on Long-term Purchase Commitment [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] San Juan Generating Station And Four Corners [Member] Surface [Member] Loss on Long-term Purchase Commitment [Member] | Apr. 30, 2010 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Water Supply [Member] Cities | Mar. 31, 2012 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Plant [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Plant [Member] Maximum [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Plant [Member] Commercial Providers [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] Nuclear Plant [Member] Industry Wide Retrospective Assessment Program [Member] | Mar. 31, 2012 Tortoise Capital Resources Corporation [Member] TGP Granada, LLC and its affiliate Complaint [Member] | Apr. 27, 2012 Increased deferral under Fuel and purchased power adjustment clause [Member] Public Service Company of New Mexico [Member] San Juan Generating Station [Member] Fuel and Purchased Power Adjustment Clause [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Inventories of previously mined coal available to supply the fuel requirements |  |  |  |  |  |  |  |  |  |  |  | 8 months 15 days |  |  |  |  |  |  |  |  |  |  |
Other current assets | $ 38,297,000 | $ 33,397,000 | $ 34,061,000 | $ 26,776,000 |  |  |  |  |  |  |  |  | $ 13,300,000 | $ 14,600,000 |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,500,000 | 53,300,000 |  |  |  |  |  |  |
Loss Contingency Accrual, Carrying Value, Payments |  |  |  |  |  |  | 900,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, at Carrying Value |  |  |  |  |  |  | 26,100,000 |  | 26,500,000 | 4,200,000 | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Final Reclamation, capped amount to be collected |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preliminary estimate increased deferral related to mine fire incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,400,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,100,000 |  |  |  |  |
Public Utilities, Number of Cities to provide cooling water essential to power production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Litigation Settlement, Gross |  |  |  |  | $ 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, Signed an agreement with cities to provide cooling water essential to power production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |

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