XML 110 R89.htm IDEA: XBRL DOCUMENT
v3.24.3

Regulatory and Rate Matters - Fours Corners, Summer Peak Resource Adequacy, 2026 Resource Application, Grid Modernization Application (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2023 MW batteryStorageAgreement | Oct. 03, 2022 USD ($) | Jan. 08, 2021 USD ($) | Aug. 31, 2024 USD ($) | Nov. 30, 2020 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of battery storage agreements | batteryStorageAgreement | 3 |  |  |  |  |  |  |
PNM |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Grid modernization investment |  | $ 344,000 |  |  |  |  |  |
Grid modernization, initial term |  | 6 years |  |  |  |  |  |
Grid modernization term |  | 11 years |  |  |  |  |  |
PNM | Solar Agreement One |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 |  |  |  |  |  |  |
PNM | Battery Storage Agreement One |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 |  |  |  |  |  |  |
PNM | Battery Storage Agreement Two |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 100 |  |  |  |  |  |  |
PNM | Battery Storage Agreement Three |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 50 |  |  |  |  |  |  |
PNM | Solar Agreement Two |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | MW | 60 |  |  |  |  |  |  |
PNM | Four Corners |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Payments for relief from obligations |  |  |  |  | $ 15,000 |  |  | $ 75,000
Final payment for relief from obligations |  |  |  |  |  |  |  | $ 60,000
Request issuance of energy transition bonds |  |  | $ 300,000 |  |  |  |  |
Regulatory disallowance |  |  |  |  |  | $ 3,700 | $ 3,700 |
Terminated agreement for reimbursement payments with interest |  |  |  | $ 15,000 |  |  |  |
PNM | Four Corners | PNM |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  |  |  | 13.00%

X
- Definition Final Payment For Relief From Obligations + References No definition available. + Details
Name: | pnm_FinalPaymentForReliefFromObligations
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Payments For Relief From Obligations + References No definition available. + Details
Name: | pnm_PaymentsForReliefFromObligations
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Grid Modernization, Initial Term + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationInitialTerm
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Grid Modernization Investment + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationInvestment
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Grid Modernization Term + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationTerm
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Number Of Megawatts Available In Purchase Power Agreement + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfMegawattsAvailableInPurchasePowerAgreement
Namespace Prefix: | pnm_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Regulatory Disallowance + References No definition available. + Details
Name: | pnm_PublicUtilitiesRegulatoryDisallowance
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Reimbursement Agreement + References No definition available. + Details
Name: | pnm_PublicUtilitiesReimbursementAgreement
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Request Issuance Of Energy Transition Bonds + References No definition available. + Details
Name: | pnm_PublicUtilitiesRequestIssuanceOfEnergyTransitionBonds
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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_PublicUtilitiesGeneralDisclosuresLineItems
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: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_SolarAgreementOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_BatteryStorageAgreementOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_BatteryStorageAgreementTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_BatteryStorageAgreementThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_SolarAgreementTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=pnm_FourCornersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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