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Regulatory and Rate Matters - Renewable Portfolio Standard and Energy Rider (Details) (Public Service Company of New Mexico [Member], USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 MWh | Dec. 31, 2013 | Dec. 31, 2014 MWh
Renewable Portfolio Standard [Member] | Required Percentage by 2011 [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales | 10.00%pnm_PublicUtilitiesRequiredPercentageOfRenewableEnergyInPortfolioToElectricSales / pnm_DateOfRegulatoryActionAxis = pnm_RequiredPercentageBy2011Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
Renewable Portfolio Standard [Member] | Required Percentage by 2015 [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales | 15.00%pnm_PublicUtilitiesRequiredPercentageOfRenewableEnergyInPortfolioToElectricSales / pnm_DateOfRegulatoryActionAxis = pnm_RequiredPercentageBy2015Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
Renewable Portfolio Standard [Member] | Required Percentage by 2020 [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales | 20.00%pnm_PublicUtilitiesRequiredPercentageOfRenewableEnergyInPortfolioToElectricSales / pnm_DateOfRegulatoryActionAxis = pnm_RequiredPercentageBy2020Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
2014 Wind generated Renewable Energy Credits [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Number of Mega Watt Hours of Wind Generation | 50,000 pnm_PublicUtilitiesNumberofMegaWattHoursofWindGeneration / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014WindgeneratedRenewableEnergyCreditsMember |  |
Renewable Portfolio Standard 2014 [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Final Cost of Solar Photovoltaic Capacity |  | $ 46,500,000 pnm_PublicUtilitiesFinalCostofSolarPhotovoltaicCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2014Member |
Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity | 23 pnm_PublicUtilitiesNumberOfMegaWattsOfSolarPhotovoltaicCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2014Member |  |
Public Utilities, Estimated Cost of Mega Watts of Solar Photovoltaic Capacity | 46,700,000 pnm_PublicUtilitiesEstimatedCostOfMegaWattsOfSolarPhotovoltaicCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2014Member |  |
Public Utilities, Wind Capacity Planned Purchase Agreement Term | 20 years |  |
Public Utilities, Number of Mega Watts of Wind Energy Capacity | 102 pnm_PublicUtilitiesNumberofMegaWattsofWindEnergyCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2014Member |  |
Public Utilities, First Year Cost of Wind Capacity Planned Purchase Agreement | 5,800,000.0 pnm_PublicUtilitiesFirstYearCostofWindCapacityPlannedPurchaseAgreement / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2014Member |  |
2015 Wind generated Renewable Energy Credits [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Number of Mega Watt Hours of Wind Generation | 120,000 pnm_PublicUtilitiesNumberofMegaWattHoursofWindGeneration / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2015WindgeneratedRenewableEnergyCreditsMember |  |
Renewable Portfolio Standard 2015 [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity | 40 pnm_PublicUtilitiesNumberOfMegaWattsOfSolarPhotovoltaicCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2015Member |  |
Public Utilities, Estimated Cost of Mega Watts of Solar Photovoltaic Capacity | 79,300,000 pnm_PublicUtilitiesEstimatedCostOfMegaWattsOfSolarPhotovoltaicCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2015Member |  |
Public Utilities, Approved Revised cost per MWh for additional necessary procurements to comply with RPS |  |  | 3.00 pnm_PublicUtilitiesApprovedRevisedcostperMWhforadditionalnecessaryprocurementstocomplywithRPS / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2015Member
Public Utilities, Number of MegaWatt Hours of renewable resources |  |  | 44,000 pnm_PublicUtilitiesNumberofMegaWattHoursofrenewableresources / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2015Member
Public Utilities, Actual cost per MWh for additional necessary procurements to comply with RPS |  |  | 1.75 pnm_PublicUtilitiesActualcostperMWhforadditionalnecessaryprocurementstocomplywithRPS / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandard2015Member
Renewable Energy Rider [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Revenue from Renewable energy rider |  |  | 34,300,000 pnm_PublicUtilitiesRevenuefromRenewableenergyrider / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewableEnergyRiderMember
Minimum [Member] | Wind Energy [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Diversification | 30.00%pnm_PublicUtilitiesRequiredPercentageOfDiversification / pnm_DiversificationByTypeAxis = pnm_WindEnergyMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
Minimum [Member] | Solar Energy [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Diversification | 20.00%pnm_PublicUtilitiesRequiredPercentageOfDiversification / pnm_DiversificationByTypeAxis = pnm_SolarEnergyMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
Minimum [Member] | Renewable Technologies [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Diversification | 5.00%pnm_PublicUtilitiesRequiredPercentageOfDiversification / pnm_DiversificationByTypeAxis = pnm_RenewableTechnologiesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
Minimum [Member] | Distributed Generation [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Required Percentage of Diversification | 3.00%pnm_PublicUtilitiesRequiredPercentageOfDiversification / pnm_DiversificationByTypeAxis = pnm_DistributedGenerationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewablePortfolioStandardMember |  |
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 |  |
Maximum [Member] | Renewable Energy Rider [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Rider Condition of Earned Return on Jurisdictional Equity in 2013 | 10.50%pnm_PublicUtilitiesRiderConditionOfEarnedReturnOnJurisdictionalEquityIn2013 / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewableEnergyRiderMember | 10.50%pnm_PublicUtilitiesRiderConditionOfEarnedReturnOnJurisdictionalEquityIn2013 / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewableEnergyRiderMember |
Public Utilities, Annual Revenue To be Collected Under 2015 Rider Rate | 44,700,000 pnm_PublicUtilitiesAnnualRevenueTobeCollectedUnder2015RiderRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewableEnergyRiderMember |  |
Public Utilities, Revised Annual Revenue To be Collected Under 2015 Rider Rate | 43,000,000 pnm_PublicUtilitiesRevisedAnnualRevenueTobeCollectedUnder2015RiderRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_RenewableEnergyRiderMember |  |

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