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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Equity [Abstract]        
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process     19.60%  
Percentage of Pension Liability Adjustment Capitalized into Other Accounts     1.10%  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     $ (81,630)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (4,264)  
Income tax impact of amounts reclassified from accumulated other comprehensive income     1,692  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     18,693  
Other Comprehensive Income (Loss), Tax     (7,417)  
Total Other Comprehensive Income (Loss) 5,668 1,770 8,704 5,998
Balance at March 31, 2013 (72,926)   (72,926)  
Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     16,406  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (9,190)  
Income tax impact of amounts reclassified from accumulated other comprehensive income     3,639  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     19,056  
Other Comprehensive Income (Loss), Tax     (7,544)  
Total Other Comprehensive Income (Loss)     5,961  
Balance at March 31, 2013 22,367   22,367  
Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     (97,820)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     4,773  
Income tax impact of amounts reclassified from accumulated other comprehensive income     (1,893)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0  
Other Comprehensive Income (Loss), Tax     0  
Total Other Comprehensive Income (Loss)     2,880  
Balance at March 31, 2013 (94,940)   (94,940)  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     (216)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     153  
Income tax impact of amounts reclassified from accumulated other comprehensive income     (54)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (363)  
Other Comprehensive Income (Loss), Tax     127  
Total Other Comprehensive Income (Loss)     (137)  
Balance at March 31, 2013 (353)   (353)  
Public Service Company of New Mexico [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     (81,414)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (4,417)  
Income tax impact of amounts reclassified from accumulated other comprehensive income     1,746  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     19,056  
Other Comprehensive Income (Loss), Tax     (7,544)  
Total Other Comprehensive Income (Loss) 5,871 1,833 8,841 6,183
Balance at March 31, 2013 (72,573)   (72,573)  
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     16,406  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (9,190)  
Income tax impact of amounts reclassified from accumulated other comprehensive income     3,639  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     19,056  
Other Comprehensive Income (Loss), Tax     (7,544)  
Total Other Comprehensive Income (Loss)     5,961  
Balance at March 31, 2013 22,367   22,367  
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     (97,820)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     4,773  
Income tax impact of amounts reclassified from accumulated other comprehensive income     (1,893)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0  
Other Comprehensive Income (Loss), Tax     0  
Total Other Comprehensive Income (Loss)     2,880  
Balance at March 31, 2013 (94,940)   (94,940)  
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  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0  
Income tax impact of amounts reclassified from accumulated other comprehensive income     0  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0  
Other Comprehensive Income (Loss), Tax     0  
Total Other Comprehensive Income (Loss)     0  
Balance at March 31, 2013 0   0  
Texas-New Mexico Power Company [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     (216)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     153  
Income tax impact of amounts reclassified from accumulated other comprehensive income     (54)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (363)  
Other Comprehensive Income (Loss), Tax     127  
Total Other Comprehensive Income (Loss) (203) (63) (137) (185)
Balance at March 31, 2013 (353)   (353)  
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  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0  
Income tax impact of amounts reclassified from accumulated other comprehensive income     0  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0  
Other Comprehensive Income (Loss), Tax     0  
Total Other Comprehensive Income (Loss)     0  
Balance at March 31, 2013 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  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0  
Income tax impact of amounts reclassified from accumulated other comprehensive income     0  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0  
Other Comprehensive Income (Loss), Tax     0  
Total Other Comprehensive Income (Loss)     0  
Balance at March 31, 2013 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     (216)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     153  
Income tax impact of amounts reclassified from accumulated other comprehensive income     (54)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (363)  
Other Comprehensive Income (Loss), Tax     127  
Total Other Comprehensive Income (Loss)     (137)  
Balance at March 31, 2013 $ (353)   $ (353)