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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investment in transmission affiliates |  |  |  |
Charges to ATC for services and construction | $ 4.5 | $ 4.5 | $ 15.5 | $ 12.3
Charges from ATC for network transmission services | $ 103.4 | $ 94.3 | $ 309.9 | $ 283.1

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