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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity [Abstract]    
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process 23.20% 15.00%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts 2.70% 2.50%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 $ (58,140) $ (81,630)
Amounts reclassified from AOCI (pre-tax) (1,912) 303
Income tax impact of amounts reclassified 756 (119)
Other OCI changes (pre-tax) 3,226 7,870
Income tax impact of other OCI changes (1,279) (3,115)
Total Other Comprehensive Income (Loss) 791 4,939
Balance at March 31, 2014 (57,349) (76,691)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 25,748 16,406
Amounts reclassified from AOCI (pre-tax) (3,255) (1,336)
Income tax impact of amounts reclassified 1,283 529
Other OCI changes (pre-tax) 3,379 7,858
Income tax impact of other OCI changes (1,332) (3,111)
Total Other Comprehensive Income (Loss) 75 3,940
Balance at March 31, 2014 25,823 20,346
Accumulated Defined Benefit Plans Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax) 1,288 1,591
Income tax impact of amounts reclassified (508) (631)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 780 960
Balance at March 31, 2014 (82,845) (96,860)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (263) (216)
Amounts reclassified from AOCI (pre-tax) 55 48
Income tax impact of amounts reclassified (19) (17)
Other OCI changes (pre-tax) (153) 12
Income tax impact of other OCI changes 53 (4)
Total Other Comprehensive Income (Loss) (64) 39
Balance at March 31, 2014 (327) (177)
Public Service Company of New Mexico [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (57,877) (81,414)
Amounts reclassified from AOCI (pre-tax) (1,967) 255
Income tax impact of amounts reclassified 775 (102)
Other OCI changes (pre-tax) 3,379 7,858
Income tax impact of other OCI changes (1,332) (3,111)
Total Other Comprehensive Income (Loss) 855 4,900
Balance at March 31, 2014 (57,022) (76,514)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 25,748 16,406
Amounts reclassified from AOCI (pre-tax) (3,255) (1,336)
Income tax impact of amounts reclassified 1,283 529
Other OCI changes (pre-tax) 3,379 7,858
Income tax impact of other OCI changes (1,332) (3,111)
Total Other Comprehensive Income (Loss) 75 3,940
Balance at March 31, 2014 25,823 20,346
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax) 1,288 1,591
Income tax impact of amounts reclassified (508) (631)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 780 960
Balance at March 31, 2014 (82,845) (96,860)
Public Service Company of New Mexico [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 0 0
Amounts reclassified from AOCI (pre-tax) 0 0
Income tax impact of amounts reclassified 0 0
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 0 0
Balance at March 31, 2014 0 0
Texas-New Mexico Power Company [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (263) (216)
Amounts reclassified from AOCI (pre-tax) 55 48
Income tax impact of amounts reclassified (19) (17)
Other OCI changes (pre-tax) (153) 12
Income tax impact of other OCI changes 53 (4)
Total Other Comprehensive Income (Loss) (64) 39
Balance at March 31, 2014 (327) (177)
Texas-New Mexico Power Company [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 0 0
Amounts reclassified from AOCI (pre-tax) 0 0
Income tax impact of amounts reclassified 0 0
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 0 0
Balance at March 31, 2014 0 0
Texas-New Mexico Power Company [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 0 0
Amounts reclassified from AOCI (pre-tax) 0 0
Income tax impact of amounts reclassified 0 0
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 0 0
Balance at March 31, 2014 0 0
Texas-New Mexico Power Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at December 31, 2012 (263) (216)
Amounts reclassified from AOCI (pre-tax) 55 48
Income tax impact of amounts reclassified (19) (17)
Other OCI changes (pre-tax) (153) 12
Income tax impact of other OCI changes 53 (4)
Total Other Comprehensive Income (Loss) (64) 39
Balance at March 31, 2014 $ (327) $ (177)