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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Operating revenues |  |  |  |
Sales of electricity | $ 2,709 | $ 2,569 | $ 5,258 | $ 5,109
Other revenue | 32 | 35 | 62 | 63
Total operating revenues | 2,741 | 2,604 | 5,320 | 5,172
Operating expenses |  |  |  |
Fuel | 672 | 524 | 1,466 | 1,164
Purchased power | 288 | 329 | 533 | 648
Operating and maintenance | 876 | 863 | 1,795 | 1,743
Depreciation and amortization | 408 | 493 | 836 | 934
Tax equivalents | 136 | 149 | 273 | 300
Total operating expenses | 2,380 | 2,358 | 4,903 | 4,789
Operating income | 361 | 246 | 417 | 383
Other income (expense), net | 11 | (14) | 26 | (5)
Interest expense |  |  |  |
Interest expense | 359 | 368 | 714 | 726
Allowance for funds used during construction and nuclear fuel expenditures | (41) | (42) | (80) | (81)
Net interest expense | 318 | 326 | 634 | 645
Net income (loss) | $ 54 | $ (94) | $ (191) | $ (267)

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