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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Operating revenues |  |  |
Sales of electricity | $ 10,829 | $ 11,086 | $ 11,723
Other revenue | 127 | 134 | 118
Total operating revenues | 10,956 | 11,220 | 11,841
Operating expenses |  |  |
Fuel | 2,820 | 2,680 | 2,926
Purchased power | 1,027 | 1,189 | 1,427
Operating and maintenance | 3,428 | 3,510 | 3,617
Depreciation and amortization | 1,680 | 1,919 | 1,772
Tax equivalents | 548 | 622 | 662
Total operating expenses | 9,503 | 9,920 | 10,404
Operating income | 1,453 | 1,300 | 1,437
Other income (expense), net | 44 | 33 | 30
Interest expense |  |  |
Interest expense | 1,394 | 1,444 | 1,431
Allowance for funds used during construction and nuclear fuel expenditures | (168) | (171) | (126)
Net interest expense | 1,226 | 1,273 | 1,305
Net income (loss) | $ 271 | $ 60 | $ 162

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