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Fair Value of Derivative and Other Financial Instruments - Commodity Derivatives (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Current assets $ 4,053,000 $ 3,813,000
Deferred charges 1,332,000 2,622,000
Current liabilities (4,746,000) (1,859,000)
Long-term liabilities (1,588,000) 0
PNMR and PNM [Member]    
Derivatives, Fair Value [Line Items]    
Amounts recognized for the right to reclaim cash collateral 0 0
Amounts posted as cash collateral under margin arrangements 2,600,000 2,700,000
Obligations to return cash collateral 100,000 100,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 4,053,000 3,813,000
Deferred charges 1,332,000 2,622,000
Commodity derivative instruments, Assets 5,385,000 6,435,000
Current liabilities (4,746,000) (1,859,000)
Long-term liabilities (1,588,000) 0
Commodity derivative instruments, Liabilities (6,334,000) (1,859,000)
Net (949,000) 4,576,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 2,800,000 3,000,000
Deferred charges 1,300,000 2,600,000
Public Service Company of New Mexico [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 4,053,000 3,813,000
Deferred charges 1,332,000 2,622,000
Current liabilities (4,746,000) (1,859,000)
Long-term liabilities (1,588,000) 0
Public Service Company of New Mexico [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 100,000 400,000
Current liabilities (100,000) $ (200,000)
Long-term liabilities $ (100,000)