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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) | Jun. 30, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 1,094,000 | $ 1,088,000
Deferred charges | 3,014,000 | 3,556,000
Current liabilities | (1,416,000) | (1,182,000)
Long-term liabilities | (3,014,000) | (3,556,000)
Obligations to return cash | $ 1,900,000 | 900,000
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 | $ 1,094,000 | 1,088,000
Deferred charges | 3,014,000 | 3,556,000
Current liabilities | (1,416,000) | (1,182,000)
Long-term liabilities | (3,014,000) | (3,556,000)
Amounts recognized for right to reclaim cash | 0 | 0
Cash collateral under margin arrangements | 500,000 | 800,000
PNM | Designated as Hedging Instrument | Commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 1,094,000 | 1,088,000
Deferred charges | 3,014,000 | 3,556,000
Derivative Asset | 4,108,000 | 4,644,000
Current liabilities | (1,416,000) | (1,182,000)
Long-term liabilities | (3,014,000) | (3,556,000)
Derivative Liability | (4,430,000) | (4,738,000)
Net | (322,000) | (94,000)
PNM | Designated as Hedging Instrument | Commodity derivatives | Fuel and purchased power costs |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 100,000 | 0
Current liabilities | (300,000) |
PNM | Designated as Hedging Instrument | Commodity derivatives | Hazard sharing arrangement |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 4,100,000 | $ 4,600,000

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