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Fair Value of Derivative and Other Financial Instruments - Derivative Balance Sheet Information (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Current assets $ 4,550,000 $ 11,232,000
Commodity derivative instruments, Current liabilities (1,153,000) (1,209,000)
Commodity derivative instruments, Long-term liabilities 0 (477,000)
Assets, Current 410,065,000 432,817,000
PNMR and PNM [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Collateral, Right to Reclaim Cash 0 0
Margin Deposit Assets 1,600,000 3,800,000
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 4,550,000 11,232,000
Commodity derivative instruments, Assets 4,550,000 11,232,000
Commodity derivative instruments, Current liabilities (1,153,000) (1,209,000)
Commodity derivative instruments, Long-term liabilities 0 (477,000)
Commodity derivative instruments, Liabilities (1,153,000) (1,686,000)
Commodity derivative instruments, Net 3,397,000 9,546,000
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] | Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Assets, Current 100,000 0
Fair Value Hedging [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] | PNMR and PNM [Member]    
Derivatives, Fair Value [Line Items]    
Current assets $ 1,500,000 $ 3,000,000