CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating revenues
Electric	$ 182,001	$ 184,368
Natural gas	41,492	53,483
Other	306	257
Total operating revenues	223,799	238,108
Operating expenses
Electric fuel and purchased power	102,614	105,482
Cost of natural gas sold and transported	26,879	37,264
Operating and maintenance expenses	38,500	39,588
Conservation program expenses	3,502	3,061
Depreciation and amortization	17,009	16,739
Taxes (other than income taxes)	6,381	6,077
Total operating expenses	194,885	208,211
Operating income	28,914	29,897
Other income, net	500	74
Allowance for funds used during construction - equity	999	106
Interest charges and financing costs
Interest charges - includes other financing costs of $426 and $364, respectively	6,015	6,003
Allowance for funds used during construction - debt	(86)	(38)
Total interest charges and financing costs	5,929	5,965
Income before income taxes	24,484	24,112
Income taxes	9,606	9,469
Net income	$ 14,878	$ 14,643