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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Operating expenses |  |  |  |
Fuel | $ 424 | $ 530 | $ 1,561 | $ 1,845
Purchased power | 408 | 350 | 1,139 | 1,234
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses | 915 | 896 | 2,671 | 2,546
Depreciation and amortization | 542 | 548 | 1,593 | 1,631
Tax equivalents | 131 | 137 | 405 | 435
Costs and Expenses | 2,420 | 2,461 | 7,369 | 7,691
Operating income | 459 | 237 | 1,429 | 981
Other income (expense), net | 14 | 20 | 55 | 57
Defined Benefit Plan, Other Cost (Credit) | 25 | 51 | 74 | 153
Interest expense |  |  |  |
Interest expense | 267 | 264 | 795 | 794
Net income (loss) | 181 | (58) | 615 | 91
Regulated Operating Revenue | 2,830 | 2,664 | 8,654 | 8,551
Unregulated Operating Revenue | 49 | 34 | 144 | 121
Regulated and Unregulated Operating Revenue | $ 2,879 | $ 2,698 | $ 8,798 | $ 8,672

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