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Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 31, 2013
Income Tax Contingency [Line Items]              
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease             $ 1,500,000
New Mexico Corporate tax rate, current 7.60%     7.60%      
New Mexico Corporate tax rate, 2014 5.90%     5.90%      
Increase in regulatory liabilities due to change in state corporate tax rate 23,900,000            
Increase in income tax expense due to change in state corporate tax rate     1,200,000        
Decrease in regulatory liabilities due to change in state corporate tax rate   4,600,000          
Decrease in deferred tax asset due to change in state corporate tax rate   200,000          
Additional Income Tax Expense, Impairment of NM Wind Credits     2,400,000        
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset           19,900,000  
Income Tax Expense (Benefit) (15,893,000)   (20,334,000) (22,313,000) (28,303,000)    
Liability for Uncertain Tax Positions, Noncurrent 14,300,000     14,300,000      
Public Service Company of New Mexico [Member]
              
Income Tax Contingency [Line Items]              
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset           11,200,000  
Income Tax Expense (Benefit) (13,106,000)   (14,943,000) (17,189,000) (21,532,000)    
Liability for Uncertain Tax Positions, Noncurrent 11,500,000     11,500,000      
Texas-New Mexico Power Company [Member]
              
Income Tax Contingency [Line Items]              
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset           6,800,000  
Income Tax Expense (Benefit) (5,590,000)   (5,055,000) (9,640,000) (7,345,000)    
Liability for Uncertain Tax Positions, Noncurrent 0     0      
Tax Years 2003 and 2005 - 2008 [Member]
              
Income Tax Contingency [Line Items]              
Income Tax Expense (Benefit) 1,300,000            
Tax Years 2003 and 2005 - 2008 [Member] | Public Service Company of New Mexico [Member]
              
Income Tax Contingency [Line Items]              
Income Tax Expense (Benefit) (1,100,000)            
Tax Years 2003 and 2005 - 2008 [Member] | Texas-New Mexico Power Company [Member]
              
Income Tax Contingency [Line Items]              
Income Tax Expense (Benefit) 0            
Tax Years 2003 and 2005 - 2008 [Member] | PNM Resources [Member]
              
Income Tax Contingency [Line Items]              
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority 2,000,000     2,000,000      
Income Tax Expense (Benefit) $ 200,000