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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Operating revenues |  |
Sales of electricity | $ 2,549 | $ 2,540
Other revenue | 30 | 28
Total operating revenues | 2,579 | 2,568
Operating expenses |  |
Fuel | 794 | 640
Purchased power | 245 | 319
Operating and maintenance | 919 | 880
Depreciation and amortization | 428 | 441
Tax equivalents | 137 | 151
Total operating expenses | 2,523 | 2,431
Operating income | 56 | 137
Other income (expense), net | 15 | 9
Interest expense |  |
Interest expense | 355 | 358
Allowance for funds used during construction and nuclear fuel expenditures | (39) | (39)
Net interest expense | 316 | 319
Net income (loss) | $ (245) | $ (173)

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