CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating revenues
Electric	$ 2,036,829	$ 2,128,397	$ 3,973,611	$ 4,158,369
Natural gas	221,313	291,538	842,348	1,056,887
Other	16,526	18,287	36,788	39,506
Total operating revenues	2,274,668	2,438,222	4,852,747	5,254,762
Operating expenses
Electric fuel and purchased power	854,373	989,413	1,718,353	1,921,241
Cost of natural gas sold and transported	89,759	163,056	507,705	706,432
Cost of sales - other	5,944	6,891	13,248	14,946
Operating and maintenance expenses	534,014	532,170	1,044,698	1,042,197
Conservation and demand side management program expenses	58,615	65,497	122,322	140,795
Depreciation and amortization	226,641	229,264	455,313	453,987
Taxes (other than income taxes)	99,632	92,489	205,256	189,059
Total operating expenses	1,868,978	2,078,780	4,066,895	4,468,657
Operating income	405,690	359,442	785,852	786,105
Other income, net	728	979	4,465	5,745
Equity earnings of unconsolidated subsidiaries	7,502	7,677	14,660	15,390
Allowance for funds used during construction - equity	15,194	13,606	28,644	26,850
Interest charges and financing costs
Interest charges - includes other financing costs of $6,036, $6,185, $12,116 and $11,445, respectively	151,921	146,338	303,751	290,692
Allowance for funds used during construction - debt	(7,683)	(7,838)	(14,290)	(15,274)
Total interest charges and financing costs	144,238	138,500	289,461	275,418
Income from continuing operations before income taxes	284,876	243,204	544,160	558,672
Income taxes	101,801	84,533	177,316	196,534
Income from continuing operations	183,075	158,671	366,844	362,138
(Loss) income from discontinued operations, net of tax	(15)	91	109	193
Net income	183,060	158,762	366,953	362,331
Dividend requirements on preferred stock	0	1,060	0	2,120
Earnings available to common shareholders	$ 183,060	$ 157,702	$ 366,953	$ 360,211
Weighted average common shares outstanding:
Basic (in shares)	487,717	484,918	487,538	484,283
Diluted (in shares)	488,017	485,241	488,006	484,775
Earnings per average common share:
Basic (in dollars per share)	$ 0.38	$ 0.33	$ 0.75	$ 0.74
Diluted (in dollars per share)	$ 0.38	$ 0.33	$ 0.75	$ 0.74
Cash dividends declared per common share (in dollars per share)	$ 0.27	$ 0.26	$ 0.53	$ 0.51