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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Operating revenues |  |
Revenue from sales of electricity | $ 2,246 | $ 2,375
Other revenue | 34 | 36
Total operating revenues | 2,280 | 2,411
Operating expenses |  |
Fuel | 480 | 550
Purchased power | 247 | 233
Operating and maintenance | 740 | 688
Depreciation and amortization | 461 | 452
Tax equivalents | 124 | 124
Total operating expenses | 2,052 | 2,047
Operating income | 228 | 364
Other income (expense), net | 12 | 9
Interest expense |  |
Interest expense | 335 | 342
Allowance for funds used during construction | (58) | (50)
Net interest expense | 277 | 292
Net income (loss) | $ (37) | $ 81

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