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Regulatory and Rate Matters - 2023 IRP, 2028 Resource Application, Grid Modernization Application (Details) - Public Service Company of New Mexico $ in Millions |  |  |  |  |  | 1 Months Ended
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Jun. 20, 2025 USD ($) | Jun. 13, 2025 MW power_purchase_agreement energy_storage_agreement | Mar. 12, 2025 MW | Dec. 30, 2024 MW | Nov. 22, 2024 MW | Oct. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Request for proposal, new energy resource, megawatts |  |  |  | 900 |  |
Grid modernization investment | $ | $ 367 |  |  |  |  | $ 344
Grid modernization, initial term |  |  |  |  |  | 6 years
Grid modernization term |  |  |  |  |  | 11 years
Grid modernization, maintenance cost | 0.18 |  |  |  |  |
Grid modernization, investment increase period | 6 years |  |  |  |  |
RFP Request, Period One |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Request for proposal, new energy resource, megawatts |  |  |  | 500 |  |
RFP Request, Period Two | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Request for proposal, new energy resource, megawatts |  |  |  | 900 |  |
RFP Request, Period Two | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Request for proposal, new energy resource, megawatts |  |  |  | 2,900 |  |
Energy Storage Agreements |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of megawatts purchase power agreements (in megawatts) |  | 3 |  |  | 2 |
Number of megawatts available in purchase power agreement (in megawatts) |  | 268 |  |  | 150 |
Megawatts purchase power agreements period |  | 20 years |  |  |  |
Purchased Power Agreements |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  | 167 |
Certificate Of Convenience And Necessity, Solar Facility |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  |  |  | 100 |
Certificate Of Convenience And Necessity, Battery |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  |  | 30 |  | 30 |
Public utilities, number of megawatts available in purchase power agreement, increase |  |  | 20 |  | 20 |
Power Purchase Agreement |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of megawatts purchase power agreements (in megawatts) | power_purchase_agreement |  | 3 |  |  |  |
Number of megawatts available in purchase power agreement (in megawatts) |  | 290 |  |  |  |
Megawatts purchase power agreements period |  | 20 years |  |  |  |

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