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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details)
Jun. 30, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]    
Current assets $ 3,847,000 $ 5,224,000
Deferred charges 4,106,000 0
Current liabilities (1,990,000) (2,339,000)
Long-term liabilities $ (4,106,000) 0
PNM    
Derivatives, Fair Value [Line Items]    
Expected exposure to market risk (in megawatts) | MW 65  
Current assets $ 3,847,000 5,224,000
Deferred charges 4,106,000 0
Current liabilities (1,990,000) (2,339,000)
Long-term liabilities (4,106,000) 0
Amounts recognized for the right to reclaim cash collateral 0 0
Amounts posted as cash collateral under margin arrangements 1,300,000 2,600,000
Obligations to return cash collateral 100,000 100,000
PNM | Designated as Hedging Instrument | Commodity derivatives    
Derivatives, Fair Value [Line Items]    
Current assets 3,847,000 5,224,000
Deferred charges 4,106,000 0
Derivative Asset 7,953,000 5,224,000
Current liabilities (1,990,000) (2,339,000)
Long-term liabilities (4,106,000) 0
Derivative Liability (6,096,000) (2,339,000)
Net 1,857,000 2,885,000
PNM | Designated as Hedging Instrument | Commodity derivatives | Fuel and purchased power costs    
Derivatives, Fair Value [Line Items]    
Current assets 100,000 200,000
Current liabilities (100,000) (100,000)
PNM | Designated as Hedging Instrument | Commodity derivatives | Palo Verde Nuclear Generating Station    
Derivatives, Fair Value [Line Items]    
Current assets 1,300,000 2,700,000
PNM | Designated as Hedging Instrument | Commodity derivatives | Hazard sharing arrangement    
Derivatives, Fair Value [Line Items]    
Derivative Asset 5,200,000 500,000
Derivative Liability $ (5,200,000) $ (500,000)