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Capitalization, Financing Activities and Convertible Preferred Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Sep. 23, 2011
Series A Convertible Preferred Stock [Member]
Apr. 30, 2012
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Pollution Control Revenue Bonds [Member]
2.54% Maturing of September 1, 2042 with a Mandatory Tender on June 1, 2017 [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Pollution Control Revenue Bonds [Member]
5.15% Maturing in 2037 [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
New Mexico Public Regulation Commission [Member]
Public Service Company of New Mexico [Member]
Extensions
Class of Stock [Line Items]          
Debt Instrument, Requested Approval to Refinance Debt   $ 20.0      
Number of Extension Options Received Authority To Exercise         2
Extension Option Granted Authority To Exercise, Years         1 year
Debt Instrument, Face Amount     20.0    
Debt Instrument, Interest Rate, Stated Percentage     2.54% 5.15%  
Debt Instrument, Refunded Amount Redeemed at Par and Retired       $ 20.0  
Preferred Stock, Agreement to purchase all outstanding shares related to convertible preferred stock 477,800        
Convertible Preferred Stock, Shares Issued upon Conversion 10