XML 89 R66.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Fair Value of Derivative and Other Financial Instruments, Sale of Power (Details) - PNMR and PNM [Member] - Palo Verde Nuclear Generating Station Unit 3 [Member] | Dec. 31, 2015 $ / MWh MW
--- | ---
Sale of Power [Line Items] |
Number of megawatts not included in retail rates (in megawatts) | MW | 134
Percentage of electric power plant output sold or contracted to sell | 100.00%
Commodity Contract [Member] |
Sale of Power [Line Items] |
Derivative, average forward price (in dollars per megawatt hour) | $ / MWh | 26

X
- Definition Percentage of Electric Power Plant Output Sold through 2017 + References No definition available. + Details
Name: | pnm_PercentageofElectricPowerPlantOutputSoldthrough2017
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
- Definition Sale of Power [Line Items] + References No definition available. + 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

X
- Details
Name: | dei_LegalEntityAxis=pnm_PnmrAndPnmMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnm_PaloVerdeNuclearGeneratingStationUnit3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |