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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($)
$ in Millions
3 Months Ended
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