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Accounts Receivable, Net (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Accounts Receivable, Net
Power receivables	$ 1,436,246,565	$ 1,570,000,000
Other receivables	114,670,205	87,000,000
Allowance for uncollectible accounts	1,000,000	1,000,000
Accounts receivable, net	$ 1,551,000,000	$ 1,657,000,000

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