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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Operating revenues |  |  |  |
Sales of Electricity | $ 2,664 | $ 2,932 | $ 8,551 | $ 8,318
Other revenue | 34 | 38 | 121 | 119
Revenues | 2,698 | 2,970 | 8,672 | 8,437
Operating expenses |  |  |  |
Fuel | 530 | 539 | 1,845 | 1,563
Purchased power | 350 | 465 | 1,234 | 1,208
Operating and maintenance | 896 | 722 | 2,546 | 2,269
Depreciation and amortization | 548 | 513 | 1,631 | 1,535
Tax equivalents | 137 | 141 | 435 | 412
Total operating expenses | 2,461 | 2,380 | 7,691 | 6,987
Operating income | 237 | 590 | 981 | 1,450
Other income (expense), net | 20 | (6) | 57 | 11
Defined Benefit Plan, Other Cost (Credit) | 51 | 64 | 153 | 194
Interest expense |  |  |  |
Interest expense | 264 | 264 | 794 | 791
Net income (loss) | $ (58) | $ 256 | $ 91 | $ 476

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