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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - ATC - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | $ 2.3 | $ 2.0
Accounts payable for services received from ATC | 30.5 | 30.2
Amounts due from ATC for transmission infrastructure upgrades | $ 15.1 | $ 13.0

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