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Lease Commitments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | May 01, 2014 MW | Jun. 01, 2014 | Jan. 14, 2016
Public Service Company of New Mexico [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value | 7.7 pnm_PublicUtilitiesOptionToPurchaseLeasedCapacityAtFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 60.00%pnm_PublicUtilitiesLeaseOwnershipPercentageInEip / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_TgpGranadaLlcAndItsAffiliateComplaintMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 31.2494 MW [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase Price of Leased Asset to be paid | 78.1 pnm_PurchasePriceofLeasedAssettobepaidJanuary152016 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases31.2494MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased Capacity to be Purchased |  | 32.76 pnm_LeasedCapacitytobePurchased / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Leased Capacity to be Purchased | 31.25 pnm_LeasedCapacitytobePurchased / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesJanuary152016Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase Price of Leased Asset to be paid | 85.2 pnm_PurchasePriceofLeasedAssettobepaidJanuary152016 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Early Purchase Price of Leased Asset, Period 1 |  |  | 79.9 pnm_EarlyPurchasePriceofLeasedAssetPeriod1 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |
Early Purchase Price of Leased Asset | 82.5 pnm_EarlyPurchasePriceofLeasedAssetPeriod2 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Maximum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Additional consideration for early purchase of leased asset, Period 1 |  |  | 5.8 pnm_AdditionalconsiderationforearlypurchaseofleasedassetPeriod1 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Additional consideration for early purchase of leased asset, Period 2 | 2.7 pnm_AdditionalconsiderationforearlypurchaseofleasedassetPeriod2 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Tortoise Capital Resources Corporation [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 40.00%pnm_PublicUtilitiesLeaseOwnershipPercentageInEip / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_TgpGranadaLlcAndItsAffiliateComplaintMember / dei_LegalEntityAxis = pnm_TortoiseCapitalResourcesCorporationMember |  |  |
Subsequent Event [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Purchase Price of Leased Asset, Period 3 |  |  |  | 85.2 pnm_PurchasePriceofLeasedAssetPeriod3 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Minimum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Additional consideration for early purchase of leased asset effective June 1, 2014 |  |  |  | $ 1.2 pnm_AdditionalconsiderationforearlypurchaseofleasedassetPeriod3 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Purchase Price of Leased Asset to be paid January 15, 2016 + References No definition available. + Details
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- Details
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- Details
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- Details
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