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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Operating revenues |  |  |  |
Sales of Electricity | $ 2,565 | $ 2,669 | $ 7,958 | $ 7,931
Other revenue | 39 | 38 | 121 | 117
Revenues | 2,604 | 2,707 | 8,079 | 8,048
Operating expenses |  |  |  |
Fuel | 417 | 503 | 1,359 | 1,473
Purchased power | 223 | 238 | 775 | 731
Operating and maintenance | 744 | 603 | 2,289 | 1,881
Depreciation and amortization | 576 | 404 | 1,387 | 1,263
Tax equivalents | 128 | 129 | 396 | 379
Total operating expenses | 2,088 | 1,877 | 6,206 | 5,727
Operating income | 516 | 830 | 1,873 | 2,321
Other income (expense), net | 14 | 11 | 52 | 34
Defined Benefit Plan, Other Cost (Credit) | 65 | 65 | 194 | 193
Interest expense |  |  |  |
Interest expense | 300 | 306 | 902 | 942
Net income (loss) | $ 165 | $ 470 | $ 829 | $ 1,220

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