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Construction Program and Jointly-Owned Electric Generating Plants Construction Program and Jointly-Owned Electric Generating Plants (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Construction Expenditures | $ 460,658us-gaap_PaymentsToAcquireProductiveAssets |  | $ 348,039us-gaap_PaymentsToAcquireProductiveAssets | $ 308,909us-gaap_PaymentsToAcquireProductiveAssets
Public Utilities, Property, Plant and Equipment, Plant in Service | 5,941,581us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService |  | 5,563,061us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (1,939,760)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation |  | (1,838,832)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation |
Operating Lease, Extended Term | 2 years |  |  |
Joint Projects [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Construction Expenditures | 316,800us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_JointProjectsMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Joint Projects [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Construction Expenditures | 127,200us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_JointProjectsMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |  |
Joint Projects [Member] | PNMR [Member] |  |  |  |
Construction Expenditures | 460,700us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_JointProjectsMember / dei_LegalEntityAxis = pnm_PnmrMember |  |  |
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 162,111us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_FourCornersUnits4And5CoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (101,007)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_FourCornersUnits4And5CoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 8,253us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_FourCornersUnits4And5CoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 13.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_FourCornersUnits4And5CoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Luna (Gas) [Member] | Other Unrelated Entities 9 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.30%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_LunaGasMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities9Member |  |  |
Luna (Gas) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 66,169us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_LunaGasMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (20,297)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_LunaGasMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 136us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_LunaGasMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 33.33%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_LunaGasMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
SJGS Units 1 and 2 [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsUnits1And2Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 1 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 41.80%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities1Member / pnm_UnitAxis = pnm_Unit3Member |  |  |
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 2 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 8.20%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities2Member / pnm_UnitAxis = pnm_Unit3Member |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 3 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 28.80%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities3Member / pnm_UnitAxis = pnm_Unit4Member |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 4 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 10.04%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities4Member / pnm_UnitAxis = pnm_Unit4Member |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 5 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 8.475%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities5Member / pnm_UnitAxis = pnm_Unit4Member |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 6 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 7.20%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities6Member / pnm_UnitAxis = pnm_Unit4Member |  |  |
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 7 [Member] |  |  |  |
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities | 7.028%pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / pnm_OtherEntitiesAxis = pnm_OtherUnrelatedEntities7Member / pnm_UnitAxis = pnm_Unit4Member |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 1,009,378us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (423,364)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 25,551us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 46.30%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 3 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_UnitAxis = pnm_Unit3Member |  |  |
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 4 [Member] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 38.457%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SjgsCoalMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_UnitAxis = pnm_Unit4Member |  |  |
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant in Service | 533,702us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | [1] |  |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (152,273)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | [1] |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | $ 42,334us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | [1] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 10.20%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | [1] |  |
Operating Lease, Original term | 40 years |  |  |
Number of operating units | 3pnm_NumberOfOperatingUnits / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Operating Lease, Extended Term | 20 years |  |  |
[1] | Includes interest in PVNGS Unit 3, interest in common facilities for all PVNGS units, and owned interests in PVNGS Units 1 and 2.

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