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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Operating expenses |  |
Fuel | $ 505 | $ 496
Purchased power | 394 | 359
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses | 905 | 867
Depreciation and amortization | 557 | 521
Tax equivalents | 146 | 133
Operating Expenses | 2,507 | 2,376
Operating income | 413 | 389
Other income (expense), net | 17 | 23
Defined Benefit Plan, Other Cost (Credit) | 25 | 23
Interest expense |  |
Interest expense | 280 | 262
Net income (loss) | 125 | 127
Regulated Operating Revenue | 2,876 | 2,731
Unregulated Operating Revenue | 44 | 34
Regulated and Unregulated Operating Revenue | $ 2,920 | $ 2,765

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