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Fair Value of Derivative and Other Financial Instruments - Derivative Balance Sheet Information (Details) - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 4,550,000 | $ 11,232,000
Commodity derivative instruments, Current liabilities | (1,153,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
Assets, Current | 410,065,000 | 432,817,000
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash | 0 | 0
Margin Deposit Assets | 1,600,000 | 3,800,000
Derivative, Collateral, Obligation to Return Cash | 200,000 | 200,000
Fair Value Hedging [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 4,550,000 | 11,232,000
Commodity derivative instruments, Assets | 4,550,000 | 11,232,000
Commodity derivative instruments, Current liabilities | (1,153,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
Commodity derivative instruments, Liabilities | (1,153,000) | (1,686,000)
Commodity derivative instruments, Net | 3,397,000 | 9,546,000
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] | Maximum [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets, Current | 100,000 | 0
Fair Value Hedging [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 1,500,000 | $ 3,000,000

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