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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net Earnings $ 17,852us-gaap_ProfitLoss $ 16,131us-gaap_ProfitLoss
Net earnings 14,340us-gaap_NetIncomeLoss 12,468us-gaap_NetIncomeLoss
Unrealized Gain on Available-for-Sale Securities:    
Unrealized holding gains arising during the period, net of income tax (expense) 4,157us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 2,047us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for (gains) included in net earnings, net of income tax expense (2,537)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (1,972)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Pension Liability Adjustment:    
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, net of income tax expense (benefit) 905us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 780us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Fair Value Adjustment for Cash Flow Hedges:    
Change in fair market value, net of income tax (expense) benefit 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (100)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Reclassification adjustment for (gains) losses included in net earnings, net of income tax expense (benefit) 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 36us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net change after income taxes 2,525us-gaap_OtherComprehensiveIncomeLossNetOfTax 791us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income 20,377us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 16,922us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (Income) Attributable to Valencia Non-controlling Interest (3,380)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest (3,531)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Preferred Stock Dividend Requirements of Subsidiary (132)pnm_PreferredStockDividendRequirementsOfSubsidiary (132)pnm_PreferredStockDividendRequirementsOfSubsidiary
Comprehensive Income Attributable to PNMR 16,865us-gaap_ComprehensiveIncomeNetOfTax 13,259us-gaap_ComprehensiveIncomeNetOfTax
Public Service Company of New Mexico [Member]    
Net Earnings 13,502us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 11,205us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Net earnings 10,122us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 7,674us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Unrealized Gain on Available-for-Sale Securities:    
Unrealized holding gains arising during the period, net of income tax (expense) 4,157us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 2,047us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Reclassification adjustment for (gains) included in net earnings, net of income tax expense (2,537)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 (1,972)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Pension Liability Adjustment:    
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, net of income tax expense (benefit) 905us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 780us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Fair Value Adjustment for Cash Flow Hedges:    
Net change after income taxes 2,525us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 855us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Comprehensive Income 16,027us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 12,060us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Comprehensive (Income) Attributable to Valencia Non-controlling Interest (3,380)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 (3,531)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Comprehensive Income Attributable to PNMR 12,647us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember		 8,529us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]    
Net Earnings 7,694us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 6,803us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember
Net earnings 7,694us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 6,803us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember
Fair Value Adjustment for Cash Flow Hedges:    
Change in fair market value, net of income tax (expense) benefit 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 (100)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember
Reclassification adjustment for (gains) losses included in net earnings, net of income tax expense (benefit) 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 36us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember
Net change after income taxes 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 (64)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember
Comprehensive Income Attributable to PNMR $ 7,694us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember		 $ 6,739us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= pnm_TexasNewMexicoPowerCompanyMember