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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Operating revenues |  |  |
Revenue from sales of electricity | $ 10,847 | $ 10,999 | $ 10,829
Other revenue | 156 | 138 | 127
Total operating revenues | 11,003 | 11,137 | 10,956
Operating expenses |  |  |
Fuel | 2,444 | 2,730 | 2,820
Purchased power | 950 | 1,094 | 1,027
Operating and maintenance | 2,838 | 3,341 | 3,428
Depreciation and amortization | 2,031 | 1,843 | 1,680
Tax equivalents | 525 | 540 | 548
Total operating expenses | 8,788 | 9,548 | 9,503
Operating income | 2,215 | 1,589 | 1,453
Other income (expense), net | 29 | 49 | 44
Interest expense |  |  |
Interest expense | 1,347 | 1,344 | 1,394
Allowance for funds used during construction | (214) | (175) | (168)
Net interest expense | 1,133 | 1,169 | 1,226
Net income (loss) | $ 1,111 | $ 469 | $ 271

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