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Income Taxes Carryforwards (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |  |
Additional Income Tax Expense, Impairment of NM Wind Credits |  |  | $ 2,400,000pnm_AdditionalIncomeTaxExpenseImpairmentofNMWindCredits | $ 700,000pnm_AdditionalIncomeTaxExpenseImpairmentofNMWindCredits
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease |  |  | 1,500,000pnm_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalDecrease |
New Mexico Corporate tax rate, current |  | 7.60%pnm_NewMexicoCorporatetaxratecurrent |  |
New Mexico Corporate tax rate, 2014 |  | 5.90%pnm_NewMexicoCorporatetaxrate2014 |  |
Increase in regulatory liabilities due to change in state corporate tax rate |  |  | 23,900,000pnm_Increaseinregulatoryliabilitiesduetochangeinstatecorporatetaxrate |
Increase in income tax expense due to change in state corporate tax rate |  |  | 1,200,000pnm_Increaseinincometaxexpenseduetochangeinstatecorporatetaxrate |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | (4,600,000)pnm_Decreaseinregulatoryliabilitiesduetochangeinstatecorporatetaxrate |  |
Decrease in deferred tax asset due to change in state corporate tax rate |  | 200,000pnm_Decreaseindeferredtaxassetduetochangeinstatecorporatetaxrate |  |
Investment tax credit, Impairment |  | 900,000pnm_InvestmenttaxcreditImpairment |  |
State Net Operating Loss Carryforward, Impairment |  | 3,100,000pnm_StateNetOperatingLossCarryforwardImpairment |  |
Deferred Tax Assets, Valuation Allowance |  | 5,500,000us-gaap_DeferredTaxAssetsValuationAllowance |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 3,900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 700,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Federal Tax Refund | 96,200,000pnm_FederalTaxRefund |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  | 19,900,000pnm_NewAccountingPronouncementsNotYetAdoptedEffectonDeferredTaxAsset |
Income Taxes |  | 69,738,000us-gaap_IncomeTaxExpenseBenefit | 59,513,000us-gaap_IncomeTaxExpenseBenefit | 54,910,000us-gaap_IncomeTaxExpenseBenefit
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal Net Operating Loss Carryforwards to Expire in 2030 |  | 405,700,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Federal Tax Credit Carryforwards that Expire Beginning in 2023 |  | 54,700,000pnm_FederalTaxCreditCarryforwardsThatExpireBeginningIn2023 / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income Taxes |  | (1,300,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Public Service Company of New Mexico [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Increase in deferred tax asset not related to regulatory activity, as a result of tax rate change |  | 100,000pnm_Increaseindeferredtaxassetnotrelatedtoregulatoryactivityasaresultoftaxratechange / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Decrease in income tax expense due to tax rate change |  | 300,000pnm_Decreaseinincometaxexpenseduetotaxratechange / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
State Net Operating Loss Carryforward, Impairment |  | 1,000,000pnm_StateNetOperatingLossCarryforwardImpairment / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Federal Tax Refund | 77,400,000pnm_FederalTaxRefund / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  | 11,200,000pnm_NewAccountingPronouncementsNotYetAdoptedEffectonDeferredTaxAsset / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |
Income Taxes |  | 52,633,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 48,804,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 50,713,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Public Service Company of New Mexico [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income Taxes |  | 1,100,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
PNM and TNMP [Domain] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 0us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = pnm_PNMandTNMPDomain |  |
Other Subsidiaries [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State Net Operating Loss Carryforward, Impairment |  | 2,100,000pnm_StateNetOperatingLossCarryforwardImpairment / dei_LegalEntityAxis = pnm_OtherSubsidiariesMember |  |
Texas-New Mexico Power Company [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  | 6,800,000pnm_NewAccountingPronouncementsNotYetAdoptedEffectonDeferredTaxAsset / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |
Income Taxes |  | 22,523,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 17,621,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 15,352,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
PNM Resources [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income Taxes |  | (5,389,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,870,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,168,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
PNM Resources [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  | (2,000,000)us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Income Taxes |  | $ (200,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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