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Fair Value of Derivative and Other Financial Instruments, Sale of Power (Details) (Palo Verde Nuclear Generating Station Unit 3 [Member], PNMR and PNM [Member]) | Dec. 31, 2014 MW
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Sale of Power [Line Items] |
Public Utilities, Number of Megawatts Nuclear Generation | 134pnm_PublicUtilitiesNumberofMegawattsNuclearGeneration
Percentage of Electric Power Plant Output Sold for 2014 and 2015 | 100.00%pnm_PercentageofElectricPowerPlantOutputSoldfor2015
Commodity Contract [Member] |
Sale of Power [Line Items] |
Derivative, Average Forward Price | 37us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationUnit3Member / dei_LegalEntityAxis = pnm_PnmrAndPnmMember

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- Definition Percentage of Electric Power Plant Output Sold for 2015 + References No definition available. + Details
Name: | pnm_PercentageofElectricPowerPlantOutputSoldfor2015
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, Number of Megawatts Nuclear Generation + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberofMegawattsNuclearGeneration
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | pnm_SaleOfPowerLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageForwardPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant