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Regulatory and Rate Matters (Tables) | 3 Months Ended
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Mar. 31, 2024
Regulated Operations [Abstract] |
Schedule of Rate Increases for Transmission Costs | The following sets forth TNMP’s recent interim transmission cost rate increases:
Effective Date |  | Approved Increase in Rate Base |  | Annual Increase in Revenue
|  | (In millions)
May 12, 2023 |  | $ | 150.5 |  |  | $ | 19.4 |
September 6, 2023 |  | 21.4 |  |  | 4.2 |
March 15, 2024 |  | 97.4 |  |  | 13.1 |
Schedule Of Interim Distribution Rate Increases | The following sets forth TNMP’s recent interim distribution rate increases:
Effective Date |  | Approved Increase in Rate Base |  | Annual Increase in Revenue
|  | (In millions)
September 1, 2022 |  | $ | 95.7 |  |  | $ | 6.8 |
September 1, 2023 |  | 157.0 |  |  | 14.5 |

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