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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $) |  |  |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  |
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Oct. 31, 2012 Public Service Company of New Mexico [Member] | Jun. 30, 2013 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Dec. 31, 2012 San Juan Generating Station [Member] Public Service Company of New Mexico [Member] Coal Supply [Member] | Jun. 30, 2013 Surface [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 TGP Granada, LLC and its affiliate Complaint [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 TGP Granada, LLC and its affiliate Complaint [Member] Tortoise Capital Resources Corporation [Member] | Jun. 30, 2013 Fuel and Purchased Power Adjustment Clause [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Nuclear Plant [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Nuclear Plant [Member] Maximum [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Nuclear Plant [Member] Commercial Providers [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Nuclear Plant [Member] Industry Wide Retrospective Assessment Program [Member] Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Loss on Long-term Purchase Commitment [Member] Surface [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Loss on Long-term Purchase Commitment [Member] Surface [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Loss on Long-term Purchase Commitment [Member] Underground [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Loss on Long-term Purchase Commitment [Member] Underground [Member] San Juan Generating Station [Member] Public Service Company of New Mexico [Member]
Public Utilities, Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets | $ 42,220,000 | $ 31,490,000 | $ 37,991,000 | $ 27,457,000 |  | $ 14,900,000 | $ 9,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final Reclamation, capped amount to be collected |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |
Preliminary estimate increased deferral related to mine fire incident |  |  |  |  |  |  |  |  |  |  | 21,600,000 |  |  |  |  |  |  |  |  |  |
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, Sublimit Amount under Nuclear Electric Insurance Limited |  |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |
Public Utilities, Maximum Amount under Nuclear Electir Insurance Limited |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  |  |  |  |  |  |  |  |
Public Utilities, Lease ownership percentage in EIP |  |  |  |  |  |  |  |  | 60.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value |  |  |  |  | 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,900,000 |  |  | 19,700,000
Loss Contingency Accrual, at Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,400,000 | 26,800,000 |  | 4,500,000 | 4,200,000 |
Regulatory Assets |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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