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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating revenues |  |
Electric revenue | $ 2,681 | $ 2,509
Other revenue | 44 | 40
Revenues | 2,725 | 2,549
Operating expenses |  |
Fuel | 441 | 475
Purchased power | 297 | 220
Operating and maintenance | 745 | 646
Depreciation and amortization | 345 | 423
Tax equivalents | 132 | 124
Total operating expenses | 1,960 | 1,888
Operating income | 765 | 661
Other income (expense), net | 24 | 12
Defined Benefit Plan, Other Cost (Credit) | 64 | 63
Interest expense |  |
Interest expense | 302 | 322
Net income (loss) | $ 423 | $ 288

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