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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 3,813,000 | $ 11,232,000
Commodity derivative instruments, Deferred charges | 2,622,000 | 0
Commodity derivative instruments, Current liabilities | (1,859,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amounts recognized for the legal right to reclaim cash collateral | 0 | 0
Amounts posted as cash collateral under margin arrangements | 2,700,000 | 3,800,000
Obligations to return cash collateral | 100,000 | 200,000
PNMR and PNM [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,813,000 | 11,232,000
Commodity derivative instruments, Deferred charges | 2,622,000 | 0
Commodity derivative instruments, Assets | 6,435,000 | 11,232,000
Commodity derivative instruments, Current liabilities | (1,859,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
Commodity derivative instruments, Liabilities | (1,859,000) | (1,686,000)
Commodity derivative instruments, Net | 4,576,000 | 9,546,000
PNMR and PNM [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,000,000 | 3,000,000
Commodity derivative instruments, Deferred charges | 2,600,000 |
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,813,000 | 11,232,000
Commodity derivative instruments, Deferred charges | 2,622,000 | 0
Commodity derivative instruments, Current liabilities | (1,859,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | $ (477,000)
Public Service Company of New Mexico [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 400,000.0 |
Commodity derivative instruments, Current liabilities | $ (200,000) |

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