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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
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

X

- 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

X

- 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

X

- 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