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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
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