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Commitments and Contingencies (Details) (USD $)
3 Months Ended9 Months Ended9 Months Ended1 Months Ended3 Months Ended
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         14,500,00014,800,000        23,700,000 23,700,000 25,000,000 3,000,0002,800,000            
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  0.0980.098    
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 assets49,043,00096,110,00041,653,00046,635,000                        17,800,00030,900,000         
Long-term Purchase Commitment, Minimum Quantity Required (tons of coal)                           44,200,000           
Loss Contingency Accrual, Carrying Value, Payments                   1,300,000900,0003,600,0003,500,000                
Public Utilities, Liability Insurance Coverage     12,600,000,000375,000,00012,200,000,000                               
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