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Stockholders' Equity (Details) (USD $)
 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2011
Sep. 23, 2011
Sep. 23, 2011
Series A convertible preferred stock [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Texas-New Mexico Power Company [Member]
Dec. 31, 2012
Texas-New Mexico Power Company [Member]
Dec. 31, 2011
Texas-New Mexico Power Company [Member]
Jan. 31, 2011
Affiliated Entity [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Affiliated Entity [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Affiliated Entity [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Affiliated Entity [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Affiliated Entity [Member]
Texas-New Mexico Power Company [Member]
Dec. 31, 2012
Affiliated Entity [Member]
Texas-New Mexico Power Company [Member]
Dec. 31, 2011
Affiliated Entity [Member]
Texas-New Mexico Power Company [Member]
Dec. 31, 2013
Line of Credit [Member]
Texas-New Mexico Power Company [Member]
Class of Stock [Line Items]                                  
Equity contribution from parent       $ 0 $ 0 $ 43,000,000 $ 13,800,000 $ 0 $ 0                
Cash dividends paid to parent company by consolidated subsidiaries                   39,100,000 155,000,000 34,400,000 8,200,000 3,700,000 26,000,000 13,700,000  
Ratio of debt to capital, maximum (as a percent) 65.00%                               65.00%
Amount available for dividend distribution without prior approval from regulators or financial counterparties       $ 206,000,000     $ 199,000,000                    
Agreement to purchase all outstanding shares related to Series A convertible preferred stock (in shares)     477,800                            
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)   4,778,000 10                            
Preferred stock, dividend rate (as a percent)       4.58%                          
Preferred stock, redemption percent (as a percent)       102.00%                          
Preferred stock, cumulative shares authorized (in shares)       10,000,000 10,000,000   1,000,000