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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Assets, Current $ 400,520,000 $ 442,191,000
Liabilities, Current 415,593,000 434,103,000
Commodity derivative instruments, Current assets 5,743,000 3,785,000
Commodity derivative instruments, Deferred charges 4,284,000 352,000
Commodity derivative instruments, Current liabilities (1,017,000) (1,000,000)
Commodity derivative instruments, Long-term liabilities (1,347,000) (1,933,000)
PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Margin Deposit Assets 2,000,000 1,900,000
Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Assets, Current 380,216,000 387,689,000
Liabilities, Current 186,272,000 242,751,000
Commodity derivative instruments, Current assets 5,743,000 3,785,000
Commodity derivative instruments, Deferred charges 4,284,000 352,000
Commodity derivative instruments, Current liabilities (1,017,000) (1,000,000)
Commodity derivative instruments, Long-term liabilities (1,347,000) (1,933,000)
Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets 5,743,000 3,785,000
Commodity derivative instruments, Deferred charges 4,284,000 352,000
Commodity derivative instruments, Assets 10,027,000 4,137,000
Commodity derivative instruments, Current liabilities (1,017,000) (1,000,000)
Commodity derivative instruments, Long-term liabilities (1,347,000) (1,933,000)
Commodity derivative instruments, Liabilities (2,364,000) (2,933,000)
Commodity derivative instruments, Net 7,663,000 1,204,000
Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Fair Value Hedging [Member] | Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Assets, Current 600,000 100,000
Assets, Noncurrent 100,000  
Liabilities, Current 100,000  
Palo Verde Nuclear Generating Station [Member] | Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Current assets 2,300,000  
Commodity derivative instruments, Deferred charges $ 3,800,000  
Palo Verde Nuclear Generating Station [Member] | Firm Contract [Member] | Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Percentage of Electric Power Plant Output Sold through 2013 100.00%