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Capitalization, Short-term Debt (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Short-term Debt [Line Items]    
Short-term debt $ 304,000 $ 222,000
PNM Resources [Member] | Revolving credit facility [Member]
    
Short-term Debt [Line Items]    
Short-term debt 31,000 32,000
PNM Resources [Member] | Local lines of credit [Member]
    
Short-term Debt [Line Items]    
Short-term debt 0 0
Public Service Company of New Mexico [Member]
    
Short-term Debt [Line Items]    
Short-term debt 273,000 190,000
Public Service Company of New Mexico [Member] | Revolving credit facility [Member]
    
Short-term Debt [Line Items]    
Short-term debt 273,000 190,000
Texas-New Mexico Power Company [Member] | Revolving credit facility [Member]
    
Short-term Debt [Line Items]    
Short-term debt 0 0
Line of Credit [Member]
    
Short-term Debt [Line Items]    
Short-term debt $ 304,000 $ 222,000