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Lease Commitments Narratives (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Lease commitments      
Operating Lease, Extended Term 2 years    
Operating Leases, Renewal Options After Original Lease Term 6 years    
Public Service Company of New Mexico [Member]
      
Lease commitments      
Cash received back from lessor $ 55,400,000 $ 55,600,000 $ 56,300,000
Operating Leases, Renewal Options After Original Lease Term 2    
Operating Leases, Rent Expense, Net 78,483,000 78,422,000 71,209,000
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]
      
Lease commitments      
Operating Lease, Extended Term, Notice Period to Retain Leased Assets 3 years    
Operating Lease, Extended Term, Notice Period to Purchase or Renewal Options 2 years    
Rental Payments, Fixed renewal option period during original terms of leases 50.00%    
Lease Covenant, Restriction on Conveying, Transferring, Leasing, & Dividends 5.00%    
Loss Contingency, Range of Possible Loss, Portion Not Accrued 167,600,000    
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member]
      
Lease commitments      
Annual lease payments 33,000,000    
Annual Lease Payments During Renewal Period 16,500,000    
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member]
      
Lease commitments      
Annual lease payments 23,700,000    
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station and EIP [Member]
      
Lease commitments      
Sale Leaseback Transaction, Annual Rental Payments 69,100,000    
Public Service Company of New Mexico [Member] | Navajo Nation [Member]
      
Lease commitments      
Annual lease payments 6,000,000    
Public Service Company of New Mexico [Member] | Delta [Member]
      
Lease commitments      
Annual lease payments 6,000,000    
Texas-New Mexico Power Company [Member]
      
Lease commitments      
Operating Leases, Rent Expense, Net 2,871,000 3,606,000 3,737,000
Corporate Headquarters [Member]
      
Lease commitments      
Operating Leases, Rent Expense, Net 1,900,000    
Approximate Annual Total for Operating Lease Payments [Member]
      
Lease commitments      
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received 39,000,000    
Approximate Annual Total for Operating Lease Payments [Member]
      
Lease commitments      
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received 33,000,000    
Administrative and General Expense [Member]
      
Lease commitments      
Abandonment expense (7,400,000)    
Administrative and General Expense [Member] | Public Service Company of New Mexico [Member]
      
Lease commitments      
Abandonment expense (6,200,000)    
Administrative and General Expense [Member] | Texas-New Mexico Power Company [Member]
      
Lease commitments      
Abandonment expense $ (1,200,000)    
Minimum [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member]
      
Lease commitments      
Operating Leases, Renewal Options After Original Lease Term 2 years    
Maximum [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member]
      
Lease commitments      
Operating Leases, Renewal Options After Original Lease Term 8 years