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Regulatory and Rate Matters - TNMP (Narrative) (Details) customer in Thousands, $ in Thousands |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 24, 2025 USD ($) | Oct. 24, 2024 USD ($) | Jul. 08, 2024 customer | Mar. 01, 2024 USD ($) | Mar. 01, 2023 USD ($) | Mar. 01, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 11, 2024 USD ($) | Aug. 28, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  | $ 8,980 | $ 71,923 | $ 832 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested increase annual distribution revenue requirement | $ 11,500 |  |  |  |  |  |  |  |  |  |
Incremental distribution investments | $ 83,500 |  |  |  |  |  |  |  |  |  |
TNMP |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  | 1,200 |  |  |  |
TNMP | System Resiliency Plan |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment owned, balance, principal amount |  |  |  |  |  |  |  |  |  | $ 565,800 | $ 600,000
Investment owned, cost |  |  |  |  |  |  |  |  |  | $ 128,200 | $ 151,000
Proposed plan investments (as a percent) |  |  |  |  |  |  |  |  |  | 94.00% |
TNMP | Hurricane |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers without power due to natural disaster | customer |  |  | 116 |  |  |  |  |  |  |  |
Utility plant incurred cost without power due to natural disaster |  |  |  |  |  |  | 53,100 |  |  |  |
TNMP | Hurricane | Public Utilities, Property, Plant and Equipment, Plant in Service |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility plant incurred cost without power due to natural disaster |  |  |  |  |  |  | 32,100 |  |  |  |
TNMP | Hurricane | Other Deferred Costs Net Including Deferred Finance Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility plant incurred cost without power due to natural disaster |  |  |  |  |  |  | $ 21,000 |  |  |  |
TNMP | Energy efficiency costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate collection amount |  | $ 7,000 |  |  |  |  |  |  |  |  |
Performance bonus |  | $ 1,300 |  | $ 1,200 | $ 1,900 | $ 2,300 |  |  |  |  |

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