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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) | Sep. 30, 2017 USD ($) MW | Dec. 31, 2016 USD ($)
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 3,093,000 | $ 5,224,000
Deferred charges | 3,846,000 | 0
Current liabilities | (1,279,000) | (2,339,000)
Long-term liabilities | $ (3,846,000) | 0
PNM |  |
Derivatives, Fair Value [Line Items] |  |
Expected exposure to market risk (in megawatts) | MW | 65 |
Power to be sold to third party (in megawatts) | MW | 36 |
Current assets | $ 3,093,000 | 5,224,000
Deferred charges | 3,846,000 | 0
Current liabilities | (1,279,000) | (2,339,000)
Long-term liabilities | (3,846,000) | 0
Amounts recognized for the right to reclaim cash collateral | 0 | 0
Amounts posted as cash collateral under margin arrangements | 1,200,000 | 2,600,000
PNM | Designated as Hedging Instrument | Commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 3,093,000 | 5,224,000
Deferred charges | 3,846,000 | 0
Derivative Asset | 6,939,000 | 5,224,000
Current liabilities | (1,279,000) | (2,339,000)
Long-term liabilities | (3,846,000) | 0
Derivative Liability | (5,125,000) | (2,339,000)
Net | 1,814,000 | 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 | (200,000) | (100,000)
PNM | Designated as Hedging Instrument | Commodity derivatives | Palo Verde Nuclear Generating Station |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 700,000 | 2,700,000
PNM | Designated as Hedging Instrument | Commodity derivatives | Hazard sharing arrangement |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 4,900,000 | 500,000
Derivative Liability | $ (5,200,000) | $ (500,000)

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