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Income Taxes Schedule of Deferred Income Tax Components (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 96,146us-gaap_IncreaseDecreaseInDeferredIncomeTaxes |  |
Change in tax effects of income tax related regulatory assets and liabilities | (6,538)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities |  |
Tax effect of mark-to-market adjustments | (1,612)pnm_TaxEffectOfMarkToMarketAdjustments |  |
Tax effect of excess pension liability | 3,993pnm_TaxEffectOfExcessPensionLiability |  |
Reclassification of unrecognized tax benefits | (4,858)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  |
Unrecognized Tax Benefits | 15,031pnm_Adjustmentforunrecognizedtaxbenefits |  |
Other | 381us-gaap_DeferredOtherTaxExpenseBenefit |  |
Deferred income taxes | 72,481us-gaap_DeferredIncomeTaxExpenseBenefit | 60,430us-gaap_DeferredIncomeTaxExpenseBenefit | 56,243us-gaap_DeferredIncomeTaxExpenseBenefit
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 70,129us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Change in tax effects of income tax related regulatory assets and liabilities | (6,349)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Tax effect of mark-to-market adjustments | (1,470)pnm_TaxEffectOfMarkToMarketAdjustments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Tax effect of excess pension liability | 3,993pnm_TaxEffectOfExcessPensionLiability / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Reclassification of unrecognized tax benefits | 1,155us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Unrecognized Tax Benefits | 12,228pnm_Adjustmentforunrecognizedtaxbenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Other | 557us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Deferred income taxes | 55,787us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 27,851us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Change in tax effects of income tax related regulatory assets and liabilities | (111)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Reclassification of unrecognized tax benefits | (6,796)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Other | (395)us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Deferred income taxes | $ 20,549us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |

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