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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investment in transmission affiliates |  |  |  |
Charges to ATC for services and construction | $ 6.3 | $ 4.0 | $ 11.0 | $ 7.8
Charges from ATC for network transmission services | $ 103.2 | $ 94.3 | $ 206.5 | $ 188.8

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