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Variable Interest Entities (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
mw
Sep. 30, 2010
Dec. 31, 2010
May 30, 2008
Variable Interest Entity, Statement Of Operation [Abstract]      
Earnings Attributable to non-controlling interest$ 4,111,000$ 3,909,000$ 10,764,000$ 10,305,000  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Current assets625,738,000 625,738,000 543,880,000 
Total assets5,372,640,0005,380,809,0005,372,640,0005,380,809,0005,225,083,000 
Current liabilities712,649,000 712,649,000 520,124,000 
Owners' equity - non-controlling interest83,969,000 83,969,000 85,177,000 
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]
      
Variable Interest Entity [Line Items]      
Operating Leases, Future Minimum Payments Due105,100,000 105,100,000   
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] | Property Lease Guarantee [Member] | Maximum [Member]
      
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Loss Contingency, Range of Possible Loss, Portion Not Accrued178,300,000 178,300,000   
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] | PVNGS [Member]
      
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Operating Leases, Future Minimum Payments Due, Current11,800,000 11,800,000 26,000,000 
Public Service Company of New Mexico [Member] | Valencia [Member]
      
Variable Interest Entity [Line Items]      
Public Utilities, Power Plant Total Construction Costs     90,000,000
Long Term Contract For Purchase of Power Term of Contract  20 years   
Long Term Contract for Purchase of Electric Power Plant, Estimated Total Output (in Megawatts)  145   
Long Term Contract For Purchase of Electric Power Fixed Costs4,600,0004,600,00013,700,00013,500,000  
Long Term Contract For Purchase of Electric Power Variable Charges900,000800,0001,300,0001,000,000  
Variable Interest Entity, Statement Of Operation [Abstract]      
Operating revenues5,505,0005,275,00015,024,00014,502,000  
Operating expenses(1,394,000)(1,366,000)(4,260,000)(4,197,000)  
Earnings Attributable to non-controlling interest4,111,0003,909,00010,764,00010,305,000  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Current assets3,588,000 3,588,000 2,372,000 
Net property, plant and equipment81,493,000 81,493,000 83,617,000 
Total assets85,081,000 85,081,000 85,989,000 
Current liabilities1,112,000 1,112,000 812,000 
Owners' equity - non-controlling interest83,969,000 83,969,000 85,177,000 
Public Service Company of New Mexico [Member] | Valencia [Member] | Maximum [Member]
      
Variable Interest Entity [Line Items]      
Jointly Owned Utility Plant, Option to Purchase Proportionate Ownership Share50.00% 50.00%   
Valencia [Member]
      
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Operating Leases, Future Minimum Payments Due, Current    26,000,000 
Public Service Company of New Mexico [Member] | PVNGS [Member]
      
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Power Plant Operating Licenses Term  20 years   
Public Service Company of New Mexico [Member] | Delta [Member]
      
Variable Interest Entity [Line Items]      
Long Term Contract For Purchase of Electric Power Fixed Costs1,500,0001,500,0004,500,0004,500,000  
Long Term Contract For Purchase of Electric Power Variable Charges700,000200,0001,000,000400,000  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining52,600,000 52,600,000   
Public Service Company of New Mexico [Member]
      
Variable Interest Entity, Statement Of Operation [Abstract]      
Earnings Attributable to non-controlling interest4,111,0003,909,00010,764,00010,305,000  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]      
Current assets387,312,000 387,312,000 384,038,000 
Total assets3,936,468,000 3,936,468,000 3,875,573,000 
Current liabilities438,578,000 438,578,000 394,961,000 
Owners' equity - non-controlling interest$ 83,969,000 $ 83,969,000 $ 85,177,000