Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions |
Sep. 19, 2025 |
Mar. 25, 2025 |
Sep. 20, 2024 |
|---|---|---|---|
| Public Utilities, General Disclosures [Line Items] | |||
| Approved Increase in Rate Base | $ 87.4 | $ 83.5 | $ 20.6 |
| Annual Increase in Revenue | $ 12.3 | $ 11.5 | $ 3.9 |