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Capitalization, Short-term Debt (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Extensions
Dec. 31, 2011
Sep. 30, 2012
Line of Credit [Member]
Dec. 31, 2011
Line of Credit [Member]
Sep. 30, 2012
PNM Resources [Member]
Revolving credit facility [Member]
Dec. 31, 2011
PNM Resources [Member]
Revolving credit facility [Member]
Sep. 30, 2012
PNM Resources [Member]
Bi-lateral line of credit [Member]
Dec. 31, 2011
PNM Resources [Member]
Bi-lateral line of credit [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Revolving credit facility [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Revolving credit facility [Member]
Sep. 30, 2012
Texas-New Mexico Power Company [Member]
Dec. 31, 2011
Texas-New Mexico Power Company [Member]
Sep. 30, 2012
Texas-New Mexico Power Company [Member]
Revolving credit facility [Member]
Dec. 31, 2011
Texas-New Mexico Power Company [Member]
Revolving credit facility [Member]
Oct. 26, 2012
Available Borrowing Capacity [Member]
Oct. 26, 2012
Available Borrowing Capacity [Member]
PNM Resources [Member]
Oct. 26, 2012
Available Borrowing Capacity [Member]
Public Service Company of New Mexico [Member]
Oct. 26, 2012
Available Borrowing Capacity [Member]
Texas-New Mexico Power Company [Member]
Oct. 26, 2012
Subsequent Event [Member]
PNM Resources [Member]
Oct. 26, 2012
Subsequent Event [Member]
Public Service Company of New Mexico [Member]
Oct. 26, 2012
Subsequent Event [Member]
Texas-New Mexico Power Company [Member]
Oct. 26, 2012
Affiliated Entity [Member]
Intercompany loan agreements [Member]
Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]                                                
Line of Credit Facility, Maximum Borrowing Capacity         $ 300,000,000   $ 5,000,000       $ 400,000,000       $ 75,000,000                  
Line of Credit Facility, Number of Extension Options 2                                              
Line of Credit Facility, Extension Option, Years 1 year                                              
Short-term Debt, Weighted Average Interest Rate         1.97%                                      
Short-term debt 113,400,000 82,700,000 113,400,000 82,700,000 113,400,000 16,700,000   0 0 66,000,000 0 66,000,000     0 0                
Line of Credit Facility, Remaining Borrowing Capacity                                 653,500,000 182,300,000 396,500,000 74,700,000        
Short-term debt – affiliate                         3,000,000 700,000                   12,300,000
Restricted Cash and Investments                                         $ 6,600,000 $ 6,600,000 $ 0