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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Current assets $ 4,148,000 $ 4,064,000
Deferred charges 1,084,000 3,002,000
Commodity derivative instruments, Current liabilities (1,370,000) (2,699,000)
Commodity derivative instruments, Long-term liabilities (688,000) (1,094,000)
Assets, Current 466,326,000 401,539,000
Liabilities, Current 700,292,000 492,671,000
PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 0 0
Derivative, Collateral, Right to Reclaim Cash 0  
Margin Deposit Assets 2,400,000 2,800,000
Derivative, Collateral, Obligation to Return Cash 200,000 200,000
Fair Value Hedging [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Current assets 4,148,000 4,064,000
Deferred charges 1,084,000 3,002,000
Commodity derivative instruments, Assets 5,232,000 7,066,000
Commodity derivative instruments, Current liabilities (1,370,000) (2,699,000)
Commodity derivative instruments, Long-term liabilities (688,000) (1,094,000)
Commodity derivative instruments, Liabilities (2,058,000) (3,793,000)
Commodity derivative instruments, Net 3,174,000 3,273,000
Fuel and Purchased Power Adjustment Clause [Member] | Fair Value Hedging [Member] | Commodity Contract [Member] | Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Assets, Current 200,000 400,000
Liabilities, Current 100,000 100,000
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%  
Palo Verde Nuclear Generating Station [Member] | Fair Value Hedging [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Current assets 3,000,000 3,000,000
Deferred charges $ 800,000 $ 3,000,000
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Public Utilities, Number of Megawatts Nuclear Generation 134  
Palo Verde Nuclear Generating Station Unit 3 [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative, Average Forward Price   37