XML 64 R61.htm IDEA: XBRL DOCUMENT v2.4.1.9
Lease Commitments Narratives (Details) (USD $)
 12 Months Ended
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