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Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions | Mar. 15, 2024 | Sep. 06, 2023 | May 12, 2023
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Public Utilities, General Disclosures [Line Items] |  |  |
Approved Increase in Rate Base | $ 97.4 | $ 21.4 | $ 150.5
Annual Increase in Revenue | $ 13.1 | $ 4.2 | $ 19.4

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