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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) (Public Service Company of New Mexico [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended |
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Oct. 06, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Maximum [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Reasonable Cost Threshold |  | 3.00%pnm_PublicUtilitiesReasonableCostThreshold / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |
Disincentives / Incentives Adder [Member] | Energy Efficiency and Load Management [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Program Costs Related To Energy Efficiency | $ 25.8 pnm_PublicUtilitiesProgramCostsRelatedToEnergyEfficiency / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyAndLoadManagementMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember |  |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program, Percentage of Program Costs |  | 7.60%pnm_PublicUtilitiesApprovedProfitIncentiveAdderRevenuesRelatedToEnergyEfficiencyProgramPercentageofProgramCosts / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyAndLoadManagementMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program |  | 1.7 pnm_PublicUtilitiesApprovedProfitIncentiveAdderRevenuesRelatedToEnergyEfficiencyProgram / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyAndLoadManagementMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember |
Public Utilities, Proposed Profit Incentive Adder Revenues Related To 2015 Energy Efficiency Program | 2.1 pnm_PublicUtilitiesProposedProfitIncentiveAdderRevenuesRelatedTo2015EnergyEfficiencyProgram / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyAndLoadManagementMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember |  |
Disincentives / Incentives Adder [Member] | 2014 Energy Efficiency and Load Management Program [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Anticipated future profit incentive 2015 |  |  | 1.7 pnm_PublicUtilitiesAnticipatedfutureprofitincentive2015 / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014EnergyEfficiencyandLoadManagementProgramMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember
Public Utilities, Anticipated future profit incentive 2016 |  |  | $ 1.8 pnm_PublicUtilitiesAnticipatedfutureprofitincentive2016 / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014EnergyEfficiencyandLoadManagementProgramMember / pnm_TypeOfRegulatoryCostAxis = pnm_DisincentivesIncentivesAdderMember

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