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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Assets, Current $ 446,825,000 $ 401,539,000
Liabilities, Current 486,869,000 492,671,000
Current assets 4,082,000 4,064,000
Deferred charges 1,515,000 3,002,000
Commodity derivative instruments, Current liabilities (5,073,000) (2,699,000)
Commodity derivative instruments, Long-term liabilities (915,000) (1,094,000)
PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Margin Deposit Assets 2,400,000 2,800,000
Derivative, Collateral, Obligation to Return Cash 100,000 200,000
Derivative, Collateral, Right to Reclaim Cash 0  
Public Service Company of New Mexico [Member]
    
Derivatives, Fair Value [Line Items]    
Assets, Current 393,099,000 348,502,000
Liabilities, Current 226,303,000 357,266,000
Current assets 4,082,000 4,064,000
Deferred charges 1,515,000 3,002,000
Commodity derivative instruments, Current liabilities (5,073,000) (2,699,000)
Commodity derivative instruments, Long-term liabilities (915,000) (1,094,000)
Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Current assets 4,082,000 4,064,000
Deferred charges 1,515,000 3,002,000
Commodity derivative instruments, Assets 5,597,000 7,066,000
Commodity derivative instruments, Current liabilities (5,073,000) (2,699,000)
Commodity derivative instruments, Long-term liabilities (915,000) (1,094,000)
Commodity derivative instruments, Liabilities (5,988,000) (3,793,000)
Commodity derivative instruments, Net (391,000) 3,273,000
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 400,000 400,000
Liabilities, Current 600,000 100,000
Palo Verde Nuclear Generating Station [Member] | Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Current assets 3,000,000 3,000,000
Deferred charges 1,500,000 3,000,000
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 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
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Assets 5,597,000 7,066,000
Commodity derivative instruments, Liabilities (5,988,000) (3,793,000)
Commodity derivative instruments, Net (391,000) 3,273,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Assets 5,597,000 7,066,000
Commodity derivative instruments, Liabilities (5,988,000) (3,793,000)
Commodity derivative instruments, Net (391,000) 3,273,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
    
Derivatives, Fair Value [Line Items]    
Commodity derivative instruments, Assets 0 0
Commodity derivative instruments, Liabilities 0 0
Commodity derivative instruments, Net $ 0 $ 0