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Regulatory and Rate Matters - Fours Corners, Summer Peak Resource Adequacy, 2026 Resource Application, Grid Modernization Application (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2023 MW batteryStorageAgreement | Oct. 03, 2022 USD ($) | Jan. 08, 2021 USD ($) | Nov. 30, 2020 USD ($) | Jun. 30, 2023 USD ($) | Jun. 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 | $ |  | $ 344.0 |  |  |  |  |
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 | $ |  |  |  | $ 15.0 |  |  | $ 75.0
Final payment for relief from obligations | $ |  |  |  |  |  |  | $ 60.0
Request issuance of energy transition bonds | $ |  |  | $ 300.0 |  |  |  |
Regulatory disallowance | $ |  |  |  |  | $ 3.7 | $ 3.7 |
PNM | Four Corners | PNM |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  |  | 13.00%

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