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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Operating revenues |  |  |
Electric revenue | $ 11,075 | $ 10,586 | $ 10,461
Other revenue | 158 | 153 | 155
Revenue from sales of electricity | 11,233 | 10,739 | 10,616
Operating expenses |  |  |
Fuel | 2,049 | 2,169 | 2,126
Purchased power | 973 | 991 | 964
Operating and maintenance | 2,854 | 3,362 | 2,842
Depreciation and amortization | 2,527 | 1,717 | 1,836
Tax equivalents | 518 | 525 | 522
Total operating expenses | 8,921 | 8,764 | 8,290
Operating income | 2,312 | 1,975 | 2,326
Other income (expense), net | 50 | 56 | 43
Interest expense |  |  |
Interest expense | 1,243 | 1,346 | 1,371
Allowance for funds used during construction | 0 | 0 | (235)
Net interest expense | 1,243 | 1,346 | 1,136
Net income (loss) | $ 1,119 | $ 685 | $ 1,233

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