XML 149 R127.htm IDEA: XBRL DOCUMENT
v3.22.4

Regulatory and Rate Matters - Summer Peak Resource Adequacy (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 30, 2023 MW | Jul. 19, 2022 MW | Mar. 18, 2022 MW | Feb. 17, 2022 MW | Nov. 15, 2015 power_purchase_agreement | Jun. 30, 2022 MW | Dec. 31, 2022 MW | Dec. 31, 2021 power_purchase_agreement | Dec. 31, 2022 MW | Dec. 31, 2021 MW replacementResource power_purchase_agreement
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of replacement resources | replacementResource |  |  |  |  |  |  |  |  |  | 4
Number of purchase power agreements | power_purchase_agreement |  |  |  |  |  |  |  | 3 |  |
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of purchase power agreements | power_purchase_agreement |  |  |  |  | 2 |  |  |  |  | 3
Number of megawatts available in purchase power agreement (in megawatts) |  |  | 65 | 327 |  |  |  |  |  |
Number of megawatts, peak during period |  | 2,139 |  |  |  |  |  |  |  |
Public Service Company of New Mexico | Portfolio One |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  |  | 35 | 270 |  | 85 | 85
Public Service Company of New Mexico | Portfolio Two |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  |  | 25 |  |  | 150 | 40
Public Service Company of New Mexico | Portfolio Three |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  |  |  | 40 |  | 40 | 150
Public Service Company of New Mexico | Solar Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | 100 |  |  |  |  |  |  |  |  |
Public Service Company of New Mexico | Battery Storage Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | 30 |  |  |  |  |  |  |  |  |
Public Service Company of New Mexico | Minimum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Projected reserve margin |  |  |  |  |  |  | 10.30% |  |  |
Public Service Company of New Mexico | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Projected reserve margin |  |  |  |  |  |  | 6.00% |  |  |

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

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

X
- Definition Public Utilities, Number Of Megawatts, Peak During Period + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfMegawattsPeakDuringPeriod
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Projected Reserve Margin + References No definition available. + Details
Name: | pnm_PublicUtilitiesProjectedReserveMargin
Namespace Prefix: | pnm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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_PortfolioOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
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: |