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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss	$ 153,858us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	$ 134,418us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Regulatory liabilities related to income taxes	78,858us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities	83,838us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Deferred Tax Assets, Tax Credit Carryforwards	54,748us-gaap_DeferredTaxAssetsTaxCreditCarryforwards	40,708us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other	68,566us-gaap_DeferredTaxAssetsOther	75,832us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	356,030us-gaap_DeferredTaxAssetsGross	334,796us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Depreciation and plant related	(914,926)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(814,671)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Investment tax credit	(36,790)pnm_DeferredTaxLiabilitiesInvestmentTaxCredit	(25,855)pnm_DeferredTaxLiabilitiesInvestmentTaxCredit
Regulatory assets related to income taxes	(67,910)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	(66,352)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
Stranded costs	(19,352)pnm_DeferredTaxLiabilitiesStrandedCosts	(22,262)pnm_DeferredTaxLiabilitiesStrandedCosts
Pension	(66,498)pnm_DeferredTaxLiabilitiesCompensationandBenefitsPensions	(58,780)pnm_DeferredTaxLiabilitiesCompensationandBenefitsPensions
Other	(115,282)us-gaap_DeferredTaxLiabilitiesOther	(115,458)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(1,220,758)us-gaap_DeferredIncomeTaxLiabilities	(1,103,378)us-gaap_DeferredIncomeTaxLiabilities
Current accumulated deferred income tax (asset) liability	(864,728)us-gaap_DeferredTaxLiabilities	(768,582)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets (Liabilities), Net [Abstract]
Current accumulated deferred income tax (asset) liability	(26,383)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	(58,681)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current accumulated deferred income tax liability	(891,111)us-gaap_DeferredTaxLiabilitiesNoncurrent	(827,263)us-gaap_DeferredTaxLiabilitiesNoncurrent
Public Service Company of New Mexico [Member]
Deferred tax assets:
Net operating loss	108,505us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	99,247us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory liabilities related to income taxes	74,293us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	78,849us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred Tax Assets, Tax Credit Carryforwards	35,259us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	22,509us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other	35,681us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	37,008us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total deferred tax assets	253,738us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	237,613us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred tax liabilities:
Depreciation and plant related	(733,519)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(661,239)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Investment tax credit	(36,790)pnm_DeferredTaxLiabilitiesInvestmentTaxCredit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(25,855)pnm_DeferredTaxLiabilitiesInvestmentTaxCredit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory assets related to income taxes	(57,637)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(55,844)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Pension	(58,474)pnm_DeferredTaxLiabilitiesCompensationandBenefitsPensions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(52,104)pnm_DeferredTaxLiabilitiesCompensationandBenefitsPensions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other	(70,714)us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(75,838)us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total deferred tax liabilities	(957,134)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(870,880)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Current accumulated deferred income tax (asset) liability	(703,396)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(633,267)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred Tax Assets (Liabilities), Net [Abstract]
Current accumulated deferred income tax (asset) liability	(12,418)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(43,827)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Non-current accumulated deferred income tax liability	(715,814)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(677,094)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Deferred tax assets:
Regulatory liabilities related to income taxes	4,565us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	4,988us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other	13,429us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	23,479us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Total deferred tax assets	17,994us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	28,467us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred tax liabilities:
Depreciation and plant related	(174,510)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(151,581)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Regulatory assets related to income taxes	(10,197)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(10,509)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Loss on reacquired debt	(12,846)pnm_DeferredTaxLiabilityLossonreacquireddebt / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(13,516)pnm_DeferredTaxLiabilityLossonreacquireddebt / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Stranded costs	(19,352)pnm_DeferredTaxLiabilitiesStrandedCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(22,262)pnm_DeferredTaxLiabilitiesStrandedCosts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other	(12,636)us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(14,295)us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Total deferred tax liabilities	(229,541)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(212,163)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Current accumulated deferred income tax (asset) liability	(211,547)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(183,696)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred Tax Assets (Liabilities), Net [Abstract]
Current accumulated deferred income tax (asset) liability	(6,398)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(6,501)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Non-current accumulated deferred income tax liability	$ (217,945)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ (190,197)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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