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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Operating revenues |  |  |  |
Revenue from sales of electricity | $ 2,522 | $ 2,618 | $ 7,722 | $ 7,869
Other revenue | 36 | 33 | 110 | 102
Total operating revenues | 2,558 | 2,651 | 7,832 | 7,971
Operating expenses |  |  |  |
Fuel | 608 | 698 | 1,744 | 1,904
Purchased power | 244 | 279 | 736 | 843
Operating and maintenance | 738 | 880 | 2,083 | 2,480
Depreciation and amortization | 534 | 463 | 1,440 | 1,357
Tax equivalents | 128 | 133 | 383 | 395
Total operating expenses | 2,252 | 2,453 | 6,386 | 6,979
Operating income | 306 | 198 | 1,446 | 992
Other income (expense), net | 8 | 10 | 25 | 37
Interest expense |  |  |  |
Interest expense | 337 | 334 | 1,020 | 1,009
Allowance for funds used during construction | (55) | (45) | (158) | (127)
Net interest expense | 282 | 289 | 862 | 882
Net income (loss) | $ 32 | $ (81) | $ 609 | $ 147

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