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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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 7,064,000 7,541,000 21,191,000 22,622,000
Expected return on plan assets (9,831,000) (9,511,000) (29,492,000) (28,533,000)
Amortization of net (gain) loss 3,705,000 3,255,000 11,115,000 9,765,000
Amortization of prior service cost (241,000) (241,000) (724,000) (724,000)
Net Periodic Benefit Cost (Income) 697,000 1,044,000 2,090,000 3,130,000
Contributions by employer 0 0 30,000,000 0
Total expected employer contributions for fiscal year 0   0  
Estimated future employer contributions after current fiscal year 22,000,000   $ 22,000,000  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Minimum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Assumptions used calculating net periodic benefit cost, discount rate     4.80%  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Assumptions used calculating net periodic benefit cost, discount rate     5.50%  
Public Service Company of New Mexico [Member] | OPEB [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 51,000 45,000 $ 153,000 136,000
Interest cost 1,022,000 1,159,000 3,067,000 3,473,000
Expected return on plan assets (1,403,000) (1,410,000) (4,208,000) (4,229,000)
Amortization of net (gain) loss 491,000 556,000 1,474,000 1,669,000
Amortization of prior service cost (160,000) (336,000) (481,000) (1,008,000)
Net Periodic Benefit Cost (Income) 1,000 14,000 5,000 41,000
Contributions by employer 800,000 800,000 2,400,000 2,400,000
Total expected employer contributions for fiscal year 3,500,000   3,500,000  
Estimated future employer contributions after current fiscal year 14,000,000   14,000,000  
Public Service Company of New Mexico [Member] | Other Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 190,000 205,000 570,000 616,000
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 81,000 52,000 243,000 157,000
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 271,000 257,000 813,000 773,000
Contributions by employer 400,000 400,000 1,200,000 1,200,000
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 761,000 798,000 2,282,000 2,395,000
Expected return on plan assets (1,105,000) (1,132,000) (3,315,000) (3,395,000)
Amortization of net (gain) loss 195,000 166,000 586,000 499,000
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (149,000) (168,000) (447,000) (501,000)
Contributions by employer       0
Estimated future employer contributions after current fiscal year $ 0   0  
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Minimum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Assumptions used calculating net periodic benefit cost, discount rate 4.80%      
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Assumptions used calculating net periodic benefit cost, discount rate 5.50%      
Texas-New Mexico Power Company [Member] | OPEB [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 62,000 59,000 185,000 178,000
Interest cost 152,000 155,000 456,000 464,000
Expected return on plan assets (130,000) (133,000) (390,000) (400,000)
Amortization of net (gain) loss 0 (31,000) 0 (92,000)
Amortization of prior service cost 0 8,000 0 24,000
Net Periodic Benefit Cost (Income) 84,000 58,000 251,000 174,000
Contributions by employer   0 0 300,000
Total expected employer contributions for fiscal year 300,000   300,000  
Estimated future employer contributions after current fiscal year 1,400,000   1,400,000  
Texas-New Mexico Power Company [Member] | Other Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 9,000 10,000 27,000 29,000
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 1,000 0 3,000 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 10,000 10,000 30,000 29,000
Total expected employer contributions for fiscal year 100,000   100,000  
Texas-New Mexico Power Company [Member] | Other Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Contributions by employer $ 100,000 $ 100,000 $ 100,000 $ 100,000