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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Operating revenues |  |  |
Revenue from sales of electricity | $ 10,999 | $ 10,829 | $ 11,086
Other revenue | 138 | 127 | 134
Total operating revenues | 11,137 | 10,956 | 11,220
Operating expenses |  |  |
Fuel | 2,730 | 2,820 | 2,680
Purchased power | 1,094 | 1,027 | 1,189
Operating and maintenance | 3,341 | 3,428 | 3,510
Depreciation and amortization | 1,843 | 1,680 | 1,919
Tax equivalents | 540 | 548 | 622
Total operating expenses | 9,548 | 9,503 | 9,920
Operating income | 1,589 | 1,453 | 1,300
Other income (expense), net | 49 | 44 | 33
Interest expense |  |  |
Interest expense | 1,344 | 1,394 | 1,444
Allowance for funds used during construction and nuclear fuel expenditures | (175) | (168) | (171)
Net interest expense | 1,169 | 1,226 | 1,273
Net income (loss) | $ 469 | $ 271 | $ 60

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