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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) - ATC - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | $ 2.4 | $ 3.7
Accounts payable for services received from ATC | 30.3 | 29.3
Amounts due from ATC for transmission infrastructure upgrades | $ 5.3 | $ 4.6

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