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v2.4.1.9

Income Taxes Schedule of Effective Income Tax Rate Reconciliation (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] |  |  |
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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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