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Fair Value of Derivative and Other Financial Instruments - Sale of Power (Details) | Jun. 30, 2015 MW | Dec. 31, 2014 $ / MWh
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Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Public Utilities, Number of Megawatts Nuclear Generation | MW | 134 |
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member] | Commodity Contract [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Average Forward Price |  | 37
Palo Verde Nuclear Generating Station [Member] | Firm Contract [Member] | Public Service Company of New Mexico [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Percentage of Electric Power Plant Output Sold for 2014 and 2015 | 100.00% |

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