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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 | Mar. 31, 2011
Operating revenues |  |  |  |
Sales of electricity | $ 2,569 | $ 2,934 | $ 5,109 | $ 5,734
Other revenue | 35 | 34 | 63 | 62
Total operating revenues | 2,604 | 2,968 | 5,172 | 5,796
Operating expenses |  |  |  |
Fuel | 524 | 749 | 1,164 | 1,487
Purchased power | 329 | 279 | 648 | 639
Operating and maintenance | 863 | 800 | 1,743 | 1,683
Depreciation and amortization | 493 | 428 | 934 | 860
Tax equivalents | 149 | 145 | 300 | 290
Total operating expenses | 2,358 | 2,401 | 4,789 | 4,959
Operating income | 246 | 567 | 383 | 837
Other income (expense), net | (14) | 10 | (5) | 21
Interest expense |  |  |  |
Interest expense | 368 | 356 | 726 | 714
Allowance for funds used during construction and nuclear fuel expenditures | (42) | (32) | (81) | (61)
Net interest expense | 326 | 324 | 645 | 653
Net income (loss) | $ (94) | $ 253 | $ (267) | $ 205

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