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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Investment in transmission affiliates |  |
Charges to ATC for services and construction | $ 4.7 | $ 3.8
Charges from ATC for network transmission services | $ 103.3 | $ 94.5

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