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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Operating revenues |  |
Revenue from sales of electricity | $ 2,509 | $ 2,508
Other revenue | 40 | 38
Total operating revenues | 2,549 | 2,546
Operating expenses |  |
Fuel | 475 | 568
Purchased power | 220 | 242
Operating and maintenance | 709 | 741
Depreciation and amortization | 423 | 437
Tax equivalents | 124 | 129
Total operating expenses | 1,951 | 2,117
Operating income | 598 | 429
Other income (expense), net | 12 | 12
Interest expense |  |
Interest expense | 322 | 339
Net income (loss) | $ 288 | $ 102

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