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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - ATC - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investment in transmission affiliates
Accounts receivable for services provided to ATC	$ 1.4	$ 2.0
Accounts payable for services received from ATC	30.6	30.2
Amounts due from ATC for transmission infrastructure upgrades	$ 14.9	$ 13.0

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