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Regulatory and Rate Matters - TNMP Narrative (Details) customer in Thousands, $ in Millions |  |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 14, 2025 USD ($) | Jul. 08, 2024 customer | Sep. 28, 2023 USD ($) | Mar. 31, 2025 USD ($) | Mar. 26, 2025 USD ($) | Mar. 12, 2025 USD ($) | Dec. 11, 2024 USD ($) | Oct. 24, 2024 USD ($) | Aug. 28, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Sales and use tax refund |  |  |  |  |  | $ 33.6 |  |  |
Requested increase annual distribution revenue requirement | $ 25.0 |  |  |  |  |  |  |  |
Incremental distribution investments | $ 176.6 |  |  |  |  |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Energy efficiency cost recovery factor, recovery |  |  | $ 6.6 |  |  |  |  |  |
Energy efficiency cost recovery factor, approved performance bonus |  |  | $ 1.2 |  |  |  |  | $ 1.3 |
Energy efficiency cost recovery, requested bonus |  |  |  |  |  |  |  | $ 7.0 |
Texas-New Mexico Power Company | System Resiliency Plan |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Capital investment |  |  |  |  | $ 545.8 |  | $ 565.8 |  | $ 600.0
Cost related to investment |  |  |  |  | $ 86.1 |  | $ 128.2 |  | $ 151.0
Investment owned, net assets, percentage |  |  |  |  |  |  | 94.00% |  |
Texas-New Mexico Power Company | Hurricane |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers without power | customer |  | 116 |  |  |  |  |  |  |
Incurred cost without power due to natural disaster |  |  |  | $ 53.2 |  |  |  |  |
Texas-New Mexico Power Company | Hurricane | Public Utilities, Property, Plant and Equipment, Plant in Service |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Incurred cost without power due to natural disaster |  |  |  | 32.4 |  |  |  |  |
Texas-New Mexico Power Company | Hurricane | Other Deferred Charges |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Incurred cost without power due to natural disaster |  |  |  | $ 20.8 |  |  |  |  |

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