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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details)
Mar. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]    
Expected exposure to market risk (in megawatts) | MW 65  
Current assets $ 4,586,000 $ 5,224,000
Current liabilities (360,000) (2,339,000)
PNMR and PNM    
Derivatives, Fair Value [Line Items]    
Amounts recognized for the right to reclaim cash collateral 0 0
Amounts posted as cash collateral under margin arrangements 1,500,000 2,600,000
Obligations to return cash collateral 100,000 100,000
PNMR and PNM | Designated as Hedging Instrument | Commodity derivatives    
Derivatives, Fair Value [Line Items]    
Current assets 4,586,000 5,224,000
Current liabilities (360,000) (2,339,000)
Net 4,226,000 2,885,000
PNMR and PNM | Designated as Hedging Instrument | Commodity derivatives | Palo Verde Nuclear Generating Station    
Derivatives, Fair Value [Line Items]    
Current assets 2,000,000 2,700,000
PNM    
Derivatives, Fair Value [Line Items]    
Current assets 4,586,000 5,224,000
Current liabilities (360,000) (2,339,000)
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)