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Commitments and Contingencies - National Ambient Air Quality Standards (Details) (Public Service Company of New Mexico [Member]) | 0 Months Ended |  |  |  |
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Mar. 02, 2015 | Nov. 25, 2014 opp | Jan. 31, 2010 opp | Mar. 31, 2015 opp | Nov. 08, 2013
National Ambient Air Quality Standards, 2015 EPA Legal Settlement [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Period of time to act on settlement | 16 months |  |  |  |
Public Utilities, Emissions Tons of SO2 per year | 16,000 pnm_PublicUtilitiesEmissionsTonsofSO2peryear / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_NationalAmbientAirQualityStandards2015EPALegalSettlementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |
Minimum [Member] | National Ambient Air Quality Standards, 2015 EPA Legal Settlement [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Public Utilities, Emissions Tons of SO2 per year | 2,600 pnm_PublicUtilitiesEmissionsTonsofSO2peryear / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_NationalAmbientAirQualityStandards2015EPALegalSettlementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Public Utilities, 1-hour SO2 Emissions Rate | 0.45 pnm_PublicUtilities1hourSO2EmissionsRate / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_NationalAmbientAirQualityStandards2015EPALegalSettlementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
San Juan Generating Station And Four Corners [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Public Utilities, Proposed Government Standard Emission Limit |  | 65 pnm_PublicUtilitiesProposedGovernmentStandardEmissionLimit / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SanJuanGeneratingStationAndFourCornersMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 60 pnm_PublicUtilitiesProposedGovernmentStandardEmissionLimit / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SanJuanGeneratingStationAndFourCornersMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
San Juan Generating Station And Four Corners [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Public Utilities, Proposed Government Standard Emission Limit |  | 70 pnm_PublicUtilitiesProposedGovernmentStandardEmissionLimit / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SanJuanGeneratingStationAndFourCornersMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 70 pnm_PublicUtilitiesProposedGovernmentStandardEmissionLimit / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SanJuanGeneratingStationAndFourCornersMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Public Utilities, Government Standard Emission Limit |  |  |  | 75 pnm_PublicUtilitiesGovernmentStandardEmissionLimit / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_SanJuanGeneratingStationAndFourCornersMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
San Juan Generating Station [Member] | National Ambient Air Quality Standards [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Public Utilities, Revised SO2 Emissions Agreed Upon |  |  |  |  | 0.10 pnm_PublicUtilitiesRevisedSO2EmissionsAgreedUpon / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_NationalAmbientAirQualityStandardsMember / pnm_JointlyOwnedGeneratingFacilitiesAxis = pnm_SanJuanGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember

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