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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Federal income tax at statutory rates	$ 70,226us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 61,274us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 61,262us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Amortization of accumulated investment tax credits	(2,164)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment	(2,192)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment	(2,237)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Flow-through of depreciation items	1,344us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	1,132us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	1,284us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization
Earnings attributable to non-controlling interest in Valencia	(4,945)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense	(5,082)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense	(4,918)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense
State income tax, net of federal benefit	5,723us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3,818us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	4,646us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Impairment of state net operating loss carryforwards	3,129pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment	0pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment	0pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment
Impairment of state production tax credits, net of federal benefit	894pnm_EffectiveIncomeTaxRateReconciliationImpairmentofProductionTaxCreditsAmount	3,880pnm_EffectiveIncomeTaxRateReconciliationImpairmentofProductionTaxCreditsAmount	718pnm_EffectiveIncomeTaxRateReconciliationImpairmentofProductionTaxCreditsAmount
Other	(4,469)us-gaap_IncomeTaxReconciliationOtherAdjustments	(3,317)us-gaap_IncomeTaxReconciliationOtherAdjustments	(5,845)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income taxes	69,738us-gaap_IncomeTaxExpenseBenefit	59,513us-gaap_IncomeTaxExpenseBenefit	54,910us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	34.76%us-gaap_EffectiveIncomeTaxRateContinuingOperations	33.99%us-gaap_EffectiveIncomeTaxRateContinuingOperations	31.37%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Public Service Company of New Mexico [Member]
Income Taxes [Line Items]
Federal income tax at statutory rates	53,930us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	53,018us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	54,710us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Amortization of accumulated investment tax credits	(2,164)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(2,192)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(2,237)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Flow-through of depreciation items	1,325us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	1,115us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	1,268us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Earnings attributable to non-controlling interest in Valencia	(4,945)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(5,082)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(4,918)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
State income tax, net of federal benefit	5,522us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	6,202us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	6,500us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Impairment of state net operating loss carryforwards	2,145pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	0pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	0pnm_EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other	(3,180)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(4,257)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(4,610)us-gaap_IncomeTaxReconciliationOtherAdjustments / 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
Effective tax rate	34.16%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	32.22%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	32.44%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Income Taxes [Line Items]
Federal income tax at statutory rates	21,115us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	16,349us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	14,735us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
State income tax, net of federal benefit	1,257us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	1,247us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	1,185us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other	151us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	25us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	(568)us-gaap_IncomeTaxReconciliationOtherAdjustments / 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
Effective tax rate	37.33%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	37.72%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	36.47%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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