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Income Taxes Schedule of Components of Income Tax Expense (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] |  |  |
Current federal income tax | $ (2,015)us-gaap_CurrentFederalTaxExpenseBenefit | $ 0us-gaap_CurrentFederalTaxExpenseBenefit | $ (1,296)us-gaap_CurrentFederalTaxExpenseBenefit
Current state income tax | (728)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (917)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (37)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred federal income tax | 59,814us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 50,044us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 51,559us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state income tax | 14,831us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 12,578us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 6,921us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Amortization of accumulated investment tax credits | (2,164)us-gaap_InvestmentTaxCredit | (2,192)us-gaap_InvestmentTaxCredit | (2,237)us-gaap_InvestmentTaxCredit
Total income taxes | 69,738us-gaap_IncomeTaxExpenseBenefit | 59,513us-gaap_IncomeTaxExpenseBenefit | 54,910us-gaap_IncomeTaxExpenseBenefit
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | (2,175)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (479)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (12,951)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Current state income tax | (979)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (760)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (1,815)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred federal income tax | 45,890us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 42,806us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 56,194us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred state income tax | 12,061us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 9,429us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 11,522us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Amortization of accumulated investment tax credits | (2,164)us-gaap_InvestmentTaxCredit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (2,192)us-gaap_InvestmentTaxCredit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (2,237)us-gaap_InvestmentTaxCredit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total income taxes | 52,633us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 48,804us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 50,713us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | 35us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (4,957)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 9,152us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Current state income tax | 1,939us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 1,916us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 1,822us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred federal income tax | 20,577us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 20,688us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 4,406us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred state income tax | (28)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (26)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (28)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Total income taxes | $ 22,523us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 17,621us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 15,352us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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