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Pension and Other Postretirement Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Public Service Company of New Mexico [Member] | Pension Plan [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost $ 0 $ 0
Interest cost 8,058,000 8,202,000
Long-term return on plan assets (10,325,000) (9,269,000)
Amortization of net loss 2,629,000 2,302,000
Amortization of prior service cost 79,000 79,000
Net periodic benefit cost 441,000 1,314,000
Defined Benefit Plan, Contributions by Employer 77,700,000 6,000,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 85,300,000  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.30%  
Public Service Company of New Mexico [Member] | OPEB [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 54,000 65,000
Interest cost 1,324,000 1,345,000
Long-term return on plan assets (1,225,000) (1,347,000)
Amortization of net loss 972,000 801,000
Amortization of prior service cost (336,000) (662,000)
Net periodic benefit cost 789,000 202,000
Defined Benefit Plan, Contributions by Employer 800,000  
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 3,200,000  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 219,000 233,000
Long-term return on plan assets 0 0
Amortization of net loss 21,000 23,000
Amortization of prior service cost 0 0
Net periodic benefit cost 240,000 256,000
Defined Benefit Plan, Contributions by Employer 400,000 400,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 1,500,000  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 909,000 951,000
Long-term return on plan assets (1,331,000) (1,368,000)
Amortization of net loss 115,000 86,000
Amortization of prior service cost 0 0
Net periodic benefit cost (307,000) (331,000)
Defined Benefit Plan, Contributions by Employer 5,300,000 100,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 1,800,000  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.30%  
Texas-New Mexico Power Company [Member] | OPEB [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 61,000 77,000
Interest cost 156,000 163,000
Long-term return on plan assets (129,000) (133,000)
Amortization of net loss (52,000) (48,000)
Amortization of prior service cost 14,000 15,000
Net periodic benefit cost 50,000 74,000
Defined Benefit Plan, Contributions by Employer 300,000  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 11,000 12,000
Long-term return on plan assets 0 0
Amortization of net loss 0 0
Amortization of prior service cost 0 0
Net periodic benefit cost 11,000 12,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 100,000  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member] | Maximum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Contributions by Employer $ 100,000 $ 100,000