XML 103 R77.htm IDEA: XBRL DOCUMENT
v3.22.1

Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 landowner | Mar. 31, 2022 USD ($) generating_unit | Dec. 31, 2021 USD ($) | Dec. 01, 2015 Allotment_Parcel | Jul. 13, 2015 a | Jan. 22, 2015 Allotment_Parcel
PNM | Navajo Nation Allottee Matters |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number of landowners involved in the appeal | landowner | 43 |  |  |  |  |
Number of allotments where landowners are revoking rights of way renewal consents (in allotment parcels) | Allotment_Parcel |  |  |  | 2 |  | 10
Area of land (in acres) | a |  |  |  |  | 15.49 |
Number of allotment parcels at issue that are not to be condemned | Allotment_Parcel |  |  |  | 2 |  |
Number of allotment parcels at issue | Allotment_Parcel |  |  |  | 5 |  |
PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Ownership percentage in nuclear reactor |  | 10.20% |  |  |  |
Number of units | generating_unit |  | 3 |  |  |  |
Maximum potential assessment per incident |  | $ 42,100,000 |  |  |  |
Annual payment limitation related to incident |  | 6,200,000 |  |  |  |
Aggregate amount of all risk insurance |  | 2,800,000,000 |  |  |  |
Maximum amount under Nuclear Electric Insurance Limited |  | 5,400,000 |  |  |  |
PNM | Maximum | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Liability insurance coverage |  | 13,500,000,000 |  |  |  |
Liability insurance coverage sublimit |  | 2,250,000,000 |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  | 800,000 | $ 800,000 |  |  |
Commercial providers | PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Liability insurance coverage |  | 450,000,000 |  |  |  |
Industry Wide Retrospective Assessment Program | PNM | Palo Verde Nuclear Generating Station | Nuclear plant |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Liability insurance coverage |  | $ 13,100,000,000 |  |  |  |

X
- Definition Number of allotment parcels' at issue + References No definition available. + Details
Name: | pnm_NumberOfAllotmentParcelsAtIssue
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of allotment parcels' at issue, Not to be condemned + References No definition available. + Details
Name: | pnm_NumberOfAllotmentParcelsAtIssueNotToBeCondemned
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Allotments Where Landowners Are Revoking Rights Of Way Renewal Consents + References No definition available. + Details
Name: | pnm_NumberOfAllotmentsWhereLandownersAreRevokingRightsOfWayRenewalConsents
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Landowners Involved In The Appeal + References No definition available. + Details
Name: | pnm_NumberOfLandownersInvolvedInTheAppeal
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Units + References No definition available. + Details
Name: | pnm_NumberOfUnits
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Aggregate Amount of All Risk Insurance + References No definition available. + Details
Name: | pnm_PublicUtilitiesAggregateAmountOfAllRiskInsurance
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Annual Payment Limitation Related to Incident + References No definition available. + Details
Name: | pnm_PublicUtilitiesAnnualPaymentLimitationRelatedToIncident
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Commitments And Contingencies [Line Items] + References No definition available. + Details
Name: | pnm_PublicUtilitiesCommitmentsAndContingenciesLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Liability Insurance Coverage + References No definition available. + Details
Name: | pnm_PublicUtilitiesLiabilityInsuranceCoverage
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Liability Insurance Coverage Sublimit + References No definition available. + Details
Name: | pnm_PublicUtilitiesLiabilityInsuranceCoverageSublimit
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Maximum Amount Under Nuclear Electric Insurance Limited + References No definition available. + Details
Name: | pnm_PublicUtilitiesMaximumAmountUnderNuclearElectricInsuranceLimited
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Maximum Potential Assessment Per Incident + References No definition available. + Details
Name: | pnm_PublicUtilitiesMaximumPotentialAssessmentPerIncident
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Ownership Percentage In Nuclear Reactor + References No definition available. + Details
Name: | pnm_PublicUtilitiesOwnershipPercentageInNuclearReactor
Namespace Prefix: | pnm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=pnm_NavajoNationAllotteeMattersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnm_PaloVerdeNuclearGeneratingStationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
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: | pnm_InsuranceCarrierAxis=pnm_CommercialProvidersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_InsuranceCarrierAxis=pnm_IndustryWideRetrospectiveAssessmentProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |