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RATE MATTERS - FERC Annual Revenue Requirements (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended | 57 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2025
FERC 2021 PJM and SPP Transmission Formula Rate Challenge |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Stand alone treatment of nolcs annual revenue increase | $ 48.7 | $ 52.1 | $ 60.7 | $ 68.5 | $ 78.3 | $ 308.3

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