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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Operating expenses |  |  |  |
Fuel | $ 580 | $ 641 | $ 1,085 | $ 1,137
Purchased power | 572 | 372 | 966 | 731
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses | 944 | 889 | 1,849 | 1,756
Depreciation and amortization | 562 | 530 | 1,119 | 1,051
Tax equivalents | 158 | 141 | 304 | 274
Operating Expenses | 2,816 | 2,573 | 5,323 | 4,949
Operating income | 716 | 581 | 1,129 | 970
Other income (expense), net | 12 | 18 | 29 | 41
Defined Benefit Plan, Other Cost (Credit) | 27 | 26 | 52 | 49
Interest expense |  |  |  |
Interest expense | 293 | 266 | 573 | 528
Net income (loss) | 408 | 307 | 533 | 434
Regulated Operating Revenue | 3,476 | 3,093 | 6,352 | 5,824
Unregulated Operating Revenue | 56 | 61 | 100 | 95
Regulated and Unregulated Operating Revenue | $ 3,532 | $ 3,154 | $ 6,452 | $ 5,919

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