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Lease Commitments Narratives (Details) (USD $) | 12 Months Ended |  |  |
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Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013 | May 01, 2014 MW | Jan. 15, 2015 | Jan. 15, 2016 MW
Lease commitments |  |  |  |  |  |
Operating Lease, Extended Term | 2 years |  |  |  |  |
Operating Leases, Renewal Options After Original Lease Term | 6 years |  |  |  |  |
Administrative and General Expense [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Abandonment expense |  | $ (7,400,000)us-gaap_GainLossOnContractTermination / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember |  |  |  |
Corporate Headquarters [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Operating Leases, Rent Expense, Net | 1,900,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  |  |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Operating Leases, Renewal Options After Original Lease Term | 2 years |  |  |  |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value | 7,700,000pnm_PublicUtilitiesOptionToPurchaseLeasedCapacityAtFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Operating Leases, Rent Expense, Net | 76,745,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 78,483,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 78,306,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |
Public Service Company of New Mexico [Member] | Navajo Nation [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Operating Leases, Number of leases set to expire | 0pnm_OperatingLeasesNumberofleasessettoexpire / us-gaap_LeaseArrangementTypeAxis = pnm_NavajoNationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Operating Leases, Period to expiration of the lease | 5 years |  |  |  |  |
Annual lease payments | 6,000,000pnm_AnnualLeasePayments / us-gaap_LeaseArrangementTypeAxis = pnm_NavajoNationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Rental Payments, Fixed renewal option period during original terms of leases | 50.00%pnm_RentalPaymentsFixedRenewalOptionPeriodDuringOriginalTermsOfLeases / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Operating Lease, Extended Term, Notice Period to Retain Leased Assets | 3 years |  |  |  |  |
Operating Lease, Extended Term, Notice Period to Purchase or Renewal Options | 2 years |  |  |  |  |
Lease Covenant, Restriction on Conveying, Transferring, Leasing, & Dividends | 5.00%pnm_LeaseCovenantRestrictionOnConveyingTransferringLeasingDividends / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 122,200,000us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Annual lease payments | 33,000,000pnm_AnnualLeasePayments / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit1LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Annual Lease Payments During Renewal Period | 16,500,000pnm_AnnualLeasePaymentsDuringRenewalPeriod / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit1LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Annual lease payments | 23,700,000pnm_AnnualLeasePayments / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Annual Lease Payments During Renewal Period | 1,600,000pnm_AnnualLeasePaymentsDuringRenewalPeriod / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Leased Capacity to be Purchased |  |  |  | 32.76pnm_LeasedCapacitytobePurchased / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Purchase Price of Leased Asset to be paid January 15, 2016 |  |  |  | 85,200,000pnm_PurchasePriceofLeasedAssettobepaidJanuary152016 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Early Purchase Price of Leased Asset effective June 1, 2014 |  |  |  | 79,900,000pnm_EarlyPurchasePriceofLeasedAsseteffectiveJune12014 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Early Purchase Price of Leased Asset currently in effect | 81,800,000pnm_EarlyPurchasePriceofLeasedAssetcurrentlyineffect / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Public Service Company of New Mexico [Member] | Administrative and General Expense [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Abandonment expense |  | (6,200,000)us-gaap_GainLossOnContractTermination / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |
Public Service Company of New Mexico [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 60.00%pnm_PublicUtilitiesLeaseOwnershipPercentageInEip / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_TgpGranadaLlcAndItsAffiliateComplaintMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |  |  |  |
Operating Lease, Notice Period to Purchase Leased Assets | 24 months |  |  |  |  |
Public Service Company of New Mexico [Member] | Maximum [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Additional consideration for early purchase of leased asset effective June 1, 2014 |  |  |  | 5,800,000pnm_AdditionalconsiderationforearlypurchaseofleasedasseteffectiveJune12014 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Additional consideration for early purchase of leased asset currently effective | 4,500,000pnm_Additionalconsiderationforearlypurchaseofleasedassetcurrentlyeffective / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Public Service Company of New Mexico [Member] | Minimum [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Additional consideration for early purchase of leased asset effective June 1, 2014 |  |  |  | 1,200,000pnm_AdditionalconsiderationforearlypurchaseofleasedasseteffectiveJune12014 / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2Leases32.76MWMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued |  |  |  |  | 217,300,000us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Estimated Purchase Price of Leased Asset |  |  |  |  |  | 78,100,000pnm_EstimatedPurchasePriceofLeasedAsset / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Leased Capacity to be Purchased |  |  |  |  |  | 31.25pnm_LeasedCapacitytobePurchased / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Tortoise Capital Resources Corporation [Member] | TGP Granada, LLC and its affiliate Complaint [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Public Utilities, Lease ownership percentage in EIP | 40.00%pnm_PublicUtilitiesLeaseOwnershipPercentageInEip / pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis = pnm_TgpGranadaLlcAndItsAffiliateComplaintMember / dei_LegalEntityAxis = pnm_TortoiseCapitalResourcesCorporationMember |  |  |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Operating Leases, Rent Expense, Net | 3,932,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,871,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,663,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |  |
Texas-New Mexico Power Company [Member] | Administrative and General Expense [Member] |  |  |  |  |  |
Lease commitments |  |  |  |  |  |
Abandonment expense |  | $ (1,200,000)us-gaap_GainLossOnContractTermination / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |  |  |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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