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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)

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