CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating revenues
Electric	$ 870,975	$ 933,490	$ 2,267,905	$ 2,387,434
Natural gas	113,230	122,672	643,632	725,593
Steam and other	8,082	7,772	26,303	28,454
Total operating revenues	992,287	1,063,934	2,937,840	3,141,481
Operating expenses
Electric fuel and purchased power	315,319	413,093	920,916	1,089,106
Cost of natural gas sold and transported	24,662	51,104	338,630	450,064
Cost of sales - steam and other	3,650	3,793	10,745	12,903
Operating and maintenance expenses	180,994	183,152	529,476	540,491
Demand side management program expenses	33,670	29,796	92,462	87,885
Depreciation and amortization	85,905	85,146	249,645	245,392
Taxes (other than income taxes)	32,696	31,428	99,359	100,734
Total operating expenses	676,896	797,512	2,241,233	2,526,575
Operating income	315,391	266,422	696,607	614,906
Other income, net	1,000	1,806	3,582	5,704
Allowance for funds used during construction - equity	4,687	1,956	10,961	5,373
Interest charges and financing costs
Interest charges - includes other financing costs of $1,803, $1,798, $5,383 and $5,074, respectively	49,369	46,955	145,734	138,390
Allowance for funds used during construction - debt	(2,633)	(853)	(5,328)	(2,399)
Total interest charges and financing costs	46,736	46,102	140,406	135,991
Income before income taxes	274,342	224,082	570,744	489,992
Income taxes	81,899	83,364	189,609	181,626
Net income	$ 192,443	$ 140,718	$ 381,135	$ 308,366