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Inventories, Net (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Inventories, Net
Materials and supplies inventory	$ 743,733,775	$ 725,000,000
Fuel inventory	351,207,527	266,000,000
Renewable energy certificates/emission allowance inventory, net	18,077,290	14,000,000
Allowance for inventory obsolescence	(61,538,779)	(44,000,000)
Inventories, net	$ 1,051,000,000	$ 961,000,000

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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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