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Variable Interest Entities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
mw
Jun. 30, 2010
Dec. 31, 2010
May 30, 2010
Variable Interest Entity, Statement Of Operation [Abstract]            
Earnings Attributable to non-controlling interest $ 3,470,000 $ 3,292,000 $ 6,652,000 $ 6,396,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]            
Current Assets 567,288,000   567,288,000   543,880,000  
Assets 5,301,633,000 5,403,522,000 5,301,633,000 5,403,522,000 5,225,083,000  
Current liabilities 589,447,000   589,447,000   520,124,000  
Stockholders' Equity Attributable to Noncontrolling Interest 84,597,000   84,597,000   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 Due 111,400,000   111,400,000      
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 Accrued 177,000,000   177,000,000      
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, Current 26,000,000   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 Costs 4,600,000 4,500,000 9,100,000 9,000,000    
Long Term Contract For Purchase of Electric Power Variable Charges 300,000 200,000 400,000 300,000    
Variable Interest Entity, Statement Of Operation [Abstract]            
Operating revenues 4,849,000 4,725,000 9,519,000 9,227,000    
Operating expenses 1,379,000 1,433,000 2,867,000 2,831,000    
Earnings Attributable to non-controlling interest 3,470,000 3,292,000 6,652,000 6,396,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]            
Current Assets 3,158,000   3,158,000   2,372,000  
Net property, plant and equipment 82,200,000   82,200,000   83,617,000  
Assets 85,358,000   85,358,000   85,989,000  
Current liabilities 761,000   761,000   812,000  
Stockholders' Equity Attributable to Noncontrolling Interest 84,597,000   84,597,000   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 Share 50.00%   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 Costs 1,500,000 1,700,000 2,900,000 3,000,000    
Long Term Contract For Purchase of Electric Power Variable Charges     300,000 200,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]            
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining 54,100,000   54,100,000      
Public Service Company of New Mexico [Member] | Delta [Member] | Maximum [Member]
            
Variable Interest Entity [Line Items]            
Long Term Contract For Purchase of Electric Power Variable Charges 100,000 100,000        
Public Service Company of New Mexico [Member]
            
Variable Interest Entity, Statement Of Operation [Abstract]            
Earnings Attributable to non-controlling interest 3,470,000 3,292,000 6,652,000 6,396,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]            
Current Assets 368,103,000   368,103,000   384,038,000  
Assets 3,920,154,000   3,920,154,000   3,875,573,000  
Current liabilities 455,647,000   455,647,000   394,961,000  
Stockholders' Equity Attributable to Noncontrolling Interest $ 84,597,000   $ 84,597,000   $ 85,177,000