CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating revenues
Electric	$ 216,289	$ 216,545	$ 625,663	$ 592,730
Natural gas	14,484	14,266	117,814	89,178
Other	273	249	825	742
Total operating revenues	231,046	231,060	744,302	682,650
Operating expenses
Electric fuel and purchased power, non-affiliates	2,707	4,968	11,887	11,000
Purchased power, affiliates	105,092	106,554	321,550	305,539
Cost of natural gas sold and transported	7,854	7,483	78,190	52,770
Operating and maintenance expenses	47,899	42,521	140,563	127,189
Conservation program expenses	3,005	3,133	8,692	9,243
Depreciation and amortization	19,940	19,359	59,121	57,265
Taxes (other than income taxes)	7,009	6,273	20,458	19,008
Total operating expenses	193,506	190,291	640,461	582,014
Operating income	37,540	40,769	103,841	100,636
Other (expense) income, net	(9)	(61)	45	209
Allowance for funds used during construction — equity	1,576	1,029	4,915	2,755
Interest charges and financing costs
Interest charges — includes other financing costs of $408, $389, $1,159 and $1,150, respectively	7,701	7,191	21,536	20,860
Allowance for funds used during construction — debt	(733)	(471)	(2,341)	(1,280)
Total interest charges and financing costs	6,968	6,720	19,195	19,580
Income before income taxes	32,139	35,017	89,606	84,020
Income taxes	12,109	13,004	33,319	31,778
Net income	$ 20,030	$ 22,013	$ 56,287	$ 52,242