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Regulatory and Rate Matters - Summer Peak Resource Adequacy (Details) - PNM - MW |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 25, 2023 | Apr. 17, 2023 | Jan. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2021
Solar Agreement |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) | 100 |  | 100 |  |  |  |
Battery Storage Agreement |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  | 30 |  |  |  |
Portfolio One |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  | 420 |  | 85 |  |  | 85
Portfolio Two |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  | 40 | 375 | 40

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