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Pension and Other Postretirement Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Public Service Company of New Mexico [Member] | Pension Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 8,058,000 8,202,000 16,116,000 16,402,000
Long-term return on plan assets (10,325,000) (9,269,000) (20,650,000) (18,537,000)
Amortization of net loss 2,629,000 2,302,000 5,258,000 4,605,000
Amortization of prior service cost 79,000 79,000 158,000 158,000
Net periodic benefit cost 441,000 1,314,000 882,000 2,628,000
Defined Benefit Plan, Contributions by Employer 0 7,500,000 77,700,000 13,500,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 85,300,000   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 65,000 108,000 129,000
Interest cost 1,324,000 1,345,000 2,648,000 2,689,000
Long-term return on plan assets (1,225,000) (1,347,000) (2,450,000) (2,694,000)
Amortization of net loss 972,000 801,000 1,944,000 1,603,000
Amortization of prior service cost (336,000) (662,000) (672,000) (1,324,000)
Net periodic benefit cost 789,000 202,000 1,578,000 403,000
Defined Benefit Plan, Contributions by Employer 800,000 1,200,000 1,600,000 1,200,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 3,200,000   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 0 0
Interest cost 219,000 233,000 438,000 465,000
Long-term return on plan assets 0 0 0 0
Amortization of net loss 21,000 23,000 42,000 47,000
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 240,000 256,000 480,000 512,000
Defined Benefit Plan, Contributions by Employer 300,000 400,000 700,000 800,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 1,500,000   1,500,000  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 909,000 951,000 1,818,000 1,900,000
Long-term return on plan assets (1,331,000) (1,368,000) (2,662,000) (2,735,000)
Amortization of net loss 115,000 86,000 230,000 173,000
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost (307,000) (331,000) (614,000) (662,000)
Defined Benefit Plan, Contributions by Employer 0 100,000 5,300,000 200,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 1,800,000   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 77,000 122,000 153,000
Interest cost 156,000 163,000 312,000 327,000
Long-term return on plan assets (129,000) (133,000) (258,000) (267,000)
Amortization of net loss (52,000) (48,000) (104,000) (96,000)
Amortization of prior service cost 14,000 15,000 28,000 30,000
Net periodic benefit cost 50,000 74,000 100,000 147,000
Defined Benefit Plan, Contributions by Employer 0 400,000 300,000 400,000
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 11,000 12,000 22,000 23,000
Long-term return on plan assets 0 0 0 0
Amortization of net loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 11,000 12,000 22,000 23,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 100,000   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 $ 100,000 $ 100,000