CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenues
Electric	$ 198,277	$ 185,374	$ 409,374	$ 376,185
Natural gas	29,539	24,555	103,330	74,912
Other	298	246	552	493
Total operating revenues	228,114	210,175	513,256	451,590
Operating expenses
Electric fuel and purchased power, non-affiliates	2,684	1,862	9,180	6,032
Purchased power, affiliates	104,532	100,043	216,458	198,985
Cost of natural gas sold and transported	19,194	14,302	70,336	45,287
Operating and maintenance expenses	48,433	42,992	92,664	84,668
Conservation program expenses	3,015	3,118	5,687	6,110
Depreciation and amortization	19,874	19,051	39,181	37,906
Taxes (other than income taxes)	6,652	6,341	13,449	12,735
Total operating expenses	204,384	187,709	446,955	391,723
Operating income	23,730	22,466	66,301	59,867
Other (expense) income, net	(70)	155	54	270
Allowance for funds used during construction — equity	1,767	780	3,339	1,726
Interest charges and financing costs
Interest charges — includes other financing costs of $377, $380, $751 and $761, respectively	6,968	6,814	13,835	13,669
Allowance for funds used during construction — debt	(850)	(400)	(1,608)	(809)
Total interest charges and financing costs	6,118	6,414	12,227	12,860
Income before income taxes	19,309	16,987	57,467	49,003
Income taxes	7,287	6,443	21,210	18,774
Net income	$ 12,022	$ 10,544	$ 36,257	$ 30,229