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Regulatory and Rate Matters - TNMP Narrative (Details) (Texas-New Mexico Power Company [Member], USD $) | 1 Months Ended |  |
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Jul. 30, 2011 | Mar. 31, 2015 customer | Apr. 24, 2015 customer
Advanced Meter System Deployment and Surcharge Request [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Approved Deployment Costs | $ 113,400,000 pnm_PublicUtilitiesApprovedDeploymentCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |  |
Public Utilities, Collection of Deployment Costs Through Surcharge Period | 12 years |  |
Public Utilities, Completion Period of Advanced Meter Deployment | 5 years |  |
Public Utilities, Non-standard metering service cost total to be borne by opt-out customers |  | 200,000 pnm_PublicUtilitiesNonstandardmeteringservicecosttotaltobebornebyoptoutcustomers / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Public Utilities, Non-standard metering ongoing expenses total to be borne by opt-out customers |  | 500,000 pnm_PublicUtilitiesNonstandardmeteringongoingexpensestotaltobebornebyoptoutcustomers / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Public Utilities, Approved Non-standard metering ongoing expenses monthly charge |  | 36.78 pnm_PublicUtilitiesApprovedNonstandardmeteringongoingexpensesmonthlycharge / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Presumed number of customers that will elect non-standard meter service |  | 1,081 pnm_Presumednumberofcustomersthatwillelectnonstandardmeterservice / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Energy Efficiency [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Approved 2014 Program Implementation Costs |  | 5,600,000 pnm_PublicUtilitiesApproved2014ProgramImplementationCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyMember |
Public Utilities, Unapproved 2015 Program Implementation Costs, Bonus |  | 700,000 pnm_PublicUtilitiesUnapproved2015ProgramImplementationCostsBonus / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyMember |
Public Utilities, Unapproved 2015 Program Implementation Costs |  | 5,700,000 pnm_PublicUtilitiesUnapproved2015ProgramImplementationCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyMember |
Public Utilities, Approved 2014 Incentive Portion of Program Implementation Costs |  | 1,500,000 pnm_PublicUtilitiesApproved2014IncentivePortionofProgramImplementationCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyMember |
Public Utilities, Approved 2015 Program Implementation Costs |  | 5,700,000 pnm_PublicUtilitiesApproved2015ProgramImplementationCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_EnergyEfficiencyMember |
Minimum [Member] | Advanced Meter System Deployment and Surcharge Request [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Approved Non-standard metering service cost initial fee range |  | 63.97 pnm_PublicUtilitiesApprovedNonstandardmeteringservicecostinitialfeerange / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RangeAxis = us-gaap_MinimumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Maximum [Member] | Advanced Meter System Deployment and Surcharge Request [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Approved Non-standard metering service cost initial fee range |  | $ 168.61 pnm_PublicUtilitiesApprovedNonstandardmeteringservicecostinitialfeerange / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember |
Subsequent Event [Member] | Advanced Meter System Deployment and Surcharge Request [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Current number of customers that have elected non-standard meter service |  |  | 91 pnm_Currentnumberofcustomersthathaveelectednonstandardmeterservice / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_AdvancedMeterSystemDeploymentAndSurchargeRequestMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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