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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Operating revenues |  |  |  |
Revenue from sales of electricity | $ 2,753 | $ 2,508 | $ 5,262 | $ 5,016
Other revenue | 39 | 39 | 79 | 77
Total operating revenues | 2,792 | 2,547 | 5,341 | 5,093
Operating expenses |  |  |  |
Fuel | 495 | 503 | 970 | 1,071
Purchased power | 273 | 244 | 493 | 486
Operating and maintenance | 697 | 699 | 1,406 | 1,440
Depreciation and amortization | 436 | 438 | 859 | 875
Tax equivalents | 126 | 129 | 250 | 258
Total operating expenses | 2,027 | 2,013 | 3,978 | 4,130
Operating income | 765 | 534 | 1,363 | 963
Other income (expense), net | 11 | 15 | 23 | 27
Interest expense |  |  |  |
Interest expense | 314 | 338 | 636 | 677
Net income (loss) | $ 462 | $ 211 | $ 750 | $ 313

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