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Inventories, Net | 12 Months Ended
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Sep. 30, 2022
Inventory, Net [Abstract] |
Inventories, Net | 4. Inventories, Net The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net At September 30 (in millions)
| 2022 |  | 2021
Materials and supplies inventory | $ | 808 |  |  | $ | 775 |
Fuel inventory | 303 |  |  | 198 |
Renewable energy certificates/emissions allowance inventory, net | 18 |  |  | 12 |
Allowance for inventory obsolescence | (57) |  |  | (35) |
Inventories, net | $ | 1,072 |  |  | $ | 950 |
Fuel inventory increased $105 million at September 30, 2022, as compared to September 30, 2021, primarily due to an increase in coal inventory of $58 million and an increase in natural gas inventory of $32 million. Coal inventory increased primarily due to higher costs of fuel, including transportation costs, as a result of continued supply constraints driven by both domestic and export demand, limited production capacity, and market volatility. Coal inventory also increased over the prior year due to coal conservation efforts and an increase in inventory levels as TVA prepares for winter inventory needs. Natural gas inventory increased primarily due to higher gas prices, as well as an increase in the amount of stored gas to mitigate fuel price volatility.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI https://asc.fasb.org/topic&trid=2126998 + Details
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