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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Operating revenues |  |  |  |
Revenue from sales of electricity | $ 2,529 | $ 2,825 | $ 4,775 | $ 5,200
Other revenue | 42 | 38 | 76 | 74
Total operating revenues | 2,571 | 2,863 | 4,851 | 5,274
Operating expenses |  |  |  |
Fuel | 484 | 586 | 964 | 1,136
Purchased power | 237 | 259 | 484 | 492
Operating and maintenance | 669 | 657 | 1,409 | 1,345
Depreciation and amortization | 465 | 454 | 926 | 906
Tax equivalents | 127 | 131 | 251 | 255
Total operating expenses | 1,982 | 2,087 | 4,034 | 4,134
Operating income | 589 | 776 | 817 | 1,140
Other income (expense), net | 8 | 8 | 20 | 17
Interest expense |  |  |  |
Interest expense | 337 | 341 | 672 | 683
Allowance for funds used during construction | (58) | (53) | (116) | (103)
Net interest expense | 279 | 288 | 556 | 580
Net income (loss) | $ 318 | $ 496 | $ 281 | $ 577

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