XML 83 R66.htm IDEA: XBRL DOCUMENT
v3.20.2

Lease Commitments - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jan. 16, 2016 lease | Jan. 15, 2015 lease
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, payments to lessor upon occurrence of certain events |  | $ 154.5 |  | $ 154.5 |  |  |  |
Unamortized cost, right-of-way lease payments |  | 58.0 |  | 58.0 |  | $ 60.2 |  |
Operating lease, right-of-use assets, amortization expense |  | 0.9 | $ 0.9 | 2.8 | $ 2.8 |  |  |
Operating leases, capitalized financing costs, investing activities |  |  |  | 2.6 | 3.0 |  |  |
Finance leases, capitalized financing costs, investing activities |  |  |  | 1.8 | 0.4 |  |  |
Lessee, operating lease, unguaranteed residual value |  | 27.3 |  | 27.3 |  |  |  |
PNM |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating leases, capitalized financing costs, investing activities |  |  |  | 0.8 | 1.0 |  |  |
Finance leases, capitalized financing costs, investing activities |  |  |  | 0.7 | 0.2 |  |  |
Lessee, operating lease, unguaranteed residual value |  | 11.3 |  | 11.3 |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of leases, expiring | lease |  |  |  |  |  |  |  | 4
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  | 4
Annual lease payments during renewal period |  |  |  | 16.5 |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of leases, expiring | lease |  |  |  |  |  |  | 4 |
Number of leases under which lease term was extended | lease |  |  |  |  |  |  | 1 |
Annual lease payments during renewal period |  |  |  | 1.6 |  |  |  |
PNM | Navajo Nation |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Annual lease payments |  |  |  | 6.0 |  |  |  |
Right-of-way lease payments | $ 7.1 |  |  |  |  |  |  |
TNMP |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating leases, capitalized financing costs, investing activities |  |  |  | 1.8 | 1.9 |  |  |
Finance leases, capitalized financing costs, investing activities |  |  |  | 1.1 | $ 0.2 |  |  |
Lessee, operating lease, unguaranteed residual value |  | 16.0 |  | 16.0 |  |  |  |
Equipment |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  | 2.1 |  | 2.1 |  |  |  |
Equipment | PNM |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  | 0.8 |  | 0.8 |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  | $ 1.3 |  | $ 1.3 |  |  |  |

X
- Definition Annual Lease Payments During Renewal Period + References No definition available. + Details
Name: | pnm_AnnualLeasePaymentsDuringRenewalPeriod
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Finance Leases, Capitalized Financing Costs, Investing Activities + References No definition available. + Details
Name: | pnm_FinanceLeasesCapitalizedFinancingCostsInvestingActivities
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Lessee, Operating Lease, Payments To Lessor Upon Occurrence Of Certain Events + References No definition available. + Details
Name: | pnm_LesseeOperatingLeasePaymentsToLessorUponOccurrenceOfCertainEvents
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Operating Lease, Unguaranteed Residual Value + References No definition available. + Details
Name: | pnm_LesseeOperatingLeaseUnguaranteedResidualValue
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Annual lease payments + References No definition available. + Details
Name: | pnm_LesseeRightOfWayLeaseAnnualPayments
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Right-Of-Way Lease Payments + References No definition available. + Details
Name: | pnm_LesseeRightOfWayLeasePayments
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Leases, Expiring + References No definition available. + Details
Name: | pnm_NumberOfLeasesExpiring
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Operating Lease, Right-Of-Use Assets, Amortization Expense + References No definition available. + Details
Name: | pnm_OperatingLeaseRightOfUseAssetsAmortizationExpense
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating Leases, Capitalized Financing Costs, Investing Activities + References No definition available. + Details
Name: | pnm_OperatingLeasesCapitalizedFinancingCostsInvestingActivities
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Number of leases under which lease term was extended + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberofleasesunderwhichleasetermwasextended
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Unamortized Cost Of Prepaid Right-Of-Way Agreements + References No definition available. + Details
Name: | pnm_UnamortizedCostOfPrepaidRightOfWayAgreements
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of residual asset covered by residual value guarantee under operating lease. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
Name: | us-gaap_OperatingLeaseResidualValueOfLeasedAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=pnm_PaloVerdeNuclearGeneratingStationUnits1And4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=pnm_PaloVerdeNuclearGeneratingStationUnit2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=pnm_NavajoNationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |