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Fair Value of Derivative and Other Financial Instruments - Commodity Derivatives (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Current assets $ 4,356,000 $ 3,813,000
Deferred charges 1,986,000 2,622,000
Current liabilities (548,000) (1,859,000)
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 2,500,000 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 4,356,000 3,813,000
Deferred charges 1,986,000 2,622,000
Commodity derivative instruments, Assets 6,342,000 6,435,000
Current liabilities (548,000) (1,859,000)
Long-term liabilities 0 0
Commodity derivative instruments, Liabilities (548,000) (1,859,000)
Net 5,794,000 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 2,900,000 3,000,000
Deferred charges 2,000,000 2,600,000
Public Service Company of New Mexico [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 4,356,000 3,813,000
Deferred charges 1,986,000 2,622,000
Current liabilities (548,000) (1,859,000)
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   400,000
Current liabilities   $ (200,000)
Net $ 0