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STATEMENTS OF OPERATIONS (USD $) In Millions | 12 Months Ended
--- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Operating revenues |  |  |
Sales of electricity | $ 11,723 | $ 10,713 | $ 11,142
Other revenue | 118 | 161 | 113
Total operating revenues | 11,841 | 10,874 | 11,255
Operating expenses |  |  |
Fuel | 2,926 | 2,092 | 3,114
Purchased power | 1,427 | 1,127 | 1,631
Operating and maintenance | 3,617 | 3,232 | 2,395
Depreciation and amortization | 1,772 | 1,724 | 1,598
Tax equivalents | 662 | 457 | 544
Total operating expenses | 10,404 | 8,632 | 9,282
Operating income | 1,437 | 2,242 | 1,973
Other income (expense), net | 30 | 24 | 25
Interest expense |  |  |
Interest expense | 1,431 | 1,373 | 1,312
Allowance for funds used during construction and nuclear fuel expenditures | (126) | (79) | (40)
Net interest expense | 1,305 | 1,294 | 1,272
Net income (loss) | $ 162 | $ 972 | $ 726

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