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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
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 $ 25.8pnm_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   1.7pnm_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 2.1pnm_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     1.7pnm_PublicUtilitiesAnticipatedfutureprofitincentive2015
/ dei_LegalEntityAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
/ pnm_ScheduleOfRegulatoryRateMattersAxis
= pnm_A2014EnergyEfficiencyandLoadManagementProgramMember
/ pnm_TypeOfRegulatoryCostAxis
= pnm_DisincentivesIncentivesAdderMember
Public Utilities, Anticipated future profit incentive 2016     $ 1.8pnm_PublicUtilitiesAnticipatedfutureprofitincentive2016
/ dei_LegalEntityAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
/ pnm_ScheduleOfRegulatoryRateMattersAxis
= pnm_A2014EnergyEfficiencyandLoadManagementProgramMember
/ pnm_TypeOfRegulatoryCostAxis
= pnm_DisincentivesIncentivesAdderMember