Consolidated Statements of Income (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating revenue	$ 2,446	$ 2,247	$ 4,678	$ 4,406
Fuel	83	94	159	175
Purchased power	649	612	1,158	1,220
Operation and maintenance	846	755	1,631	1,468
Depreciation, decommissioning and amortization	356	320	700	629
Property and other taxes	69	62	146	130
Total operating expenses	2,003	1,843	3,794	3,622
Operating income	443	404	884	784
Interest income	2	2	5	3
Other income	39	35	77	70
Interest expense	(117)	(107)	(228)	(206)
Other expenses	(13)	(15)	(25)	(26)
Income before income taxes	354	319	713	625
Income tax expense	128	5	251	134
Net income	226	314	462	491
Dividends on preferred and preference stock	15	13	29	26
Net income available for common stock	$ 211	$ 301	$ 433	$ 465

The current period expense charged against earnings on long-lived, physical assets used in the normal conduct of business and not intended for resale to allocate or recognize the cost of assets over their useful lives; and to record the reduction in book value of an intangible asset over the benefit period of such asset; and to record the costs of decontaminating and decommissioning of facilities.

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The amount of dividends declared or paid in the period to preferred and preference shareholders, or the amount for which the obligation to pay the dividends arose in the period.

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Property and other taxes incurred that are directly related to operations of the business during the reporting period.

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Cost of electricity purchased and sold during the reporting period.

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.

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The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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