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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets $ 1,184,000 $ 3,713,000
Commodity derivative instruments, Current liabilities (1,888,000) (1,632,000)
Commodity derivative instruments, Long-term liabilities (2,770,000) (2,437,000)
Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets 1,184,000 3,713,000
Commodity derivative instruments, Current liabilities (1,888,000) (1,632,000)
Commodity derivative instruments, Long-term liabilities (2,770,000) (2,437,000)
Commodity Contract [Member] | Economic Hedges [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets 1,184,000 3,713,000
Commodity derivative instruments, Current liabilities (1,888,000) (1,632,000)
Commodity derivative instruments, Long-term liabilities (2,770,000) (2,437,000)
Commodity derivative instruments, Liabilities (4,658,000) (4,069,000)
Commodity derivative instruments, Net (3,474,000) (356,000)
Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Economic Hedges [Member] | Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets and liabilities $ 100,000 $ 500,000