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Consolidated Statements of Income (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Operating revenue | $ 3,386 | $ 3,098 | $ 8,063 | $ 7,504
Fuel | 110 | 100 | 269 | 275
Purchased power | 1,264 | 1,118 | 2,422 | 2,337
Operation and maintenance | 819 | 803 | 2,450 | 2,272
Depreciation, decommissioning and amortization | 358 | 316 | 1,058 | 945
Property and other taxes | 71 | 65 | 217 | 195
Gain on sale of assets | 0 | 0 | 0 | (1)
Total operating expenses | 2,622 | 2,402 | 6,416 | 6,023
Operating income | 764 | 696 | 1,647 | 1,481
Interest income | 2 | 2 | 7 | 5
Other income | 26 | 33 | 103 | 103
Interest expense | (116) | (109) | (344) | (315)
Other expenses | (10) | (10) | (35) | (39)
Income before income taxes | 666 | 612 | 1,378 | 1,235
Income tax expense | 245 | 205 | 496 | 338
Net income | 421 | 407 | 882 | 897
Dividends on preferred and preference stock | 15 | 13 | 44 | 39
Net income available for common stock | $ 406 | $ 394 | $ 838 | $ 858

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