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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 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]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Maximum [Member]
Nuclear Plant [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Commercial Providers [Member]
Nuclear Plant [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Industry Wide Retrospective Assessment Program [Member]
Nuclear Plant [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Jun. 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]
Jun. 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]
May 17, 2010
Public Service Company of New Mexico [Member]
Maximum [Member]
Citizen Suit Under the Clean Air Act [Member]
Jan. 06, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
San Juan Generating Station And Four Corners [Member]
Jun. 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]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 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]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Underground [Member]
San Juan Generating Station [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 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]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Coal Supply [Member]
tons
Jun. 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]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Clean Air Act related to SCR [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Clean Air Act Related to Sncr [Member]
Jun. 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]
Jun. 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]
Jun. 30, 2011
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Loss Contingencies [Line Items]                                                                        
Loss Contingency, Estimate of Possible Loss                       $ 42,800,000   $ 42,000,000   $ 54,500,000           $ 21,700,000               $ 77,000,000       $ 69,000,000    
Public Utilities, Proposed Stack Opacity Limit                                                             0.10          
Loss Contingency Accrual, at Carrying Value                   15,100,000 14,800,000           24,200,000   24,200,000   25,000,000   2,900,000 2,800,000                        
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     0.098 0.098        
Public Utilities, Government Standard Emission Limit (pounds per MMBTU, parts per million)     0.23                   0.070   0.060                         0.05                
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 assets 99,919,000 96,110,000 49,185,000 46,635,000                                           28,200,000 30,900,000                  
Long-term Purchase Commitment, Minimum Quantity Required (tons of coal)                                                 44,200,000                      
Loss Contingency Accrual, Carrying Value, Payments                                 1,300,000 900,000 2,600,000 2,000,000                                
Public Utilities, Liability Insurance Coverage           12,600,000,000 375,000,000 12,200,000,000                                                        
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