CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating revenues
Electric	$ 216,309	$ 211,524
Natural gas	48,347	43,020
Other	275	306
Total operating revenues	264,931	254,850
Operating expenses
Electric fuel and purchased power, non-affiliates	2,873	3,981
Purchased power, affiliates	106,458	108,714
Cost of natural gas sold and transported	25,987	23,418
Operating and maintenance expenses	49,862	48,619
Conservation program expenses	3,054	3,066
Depreciation and amortization	27,049	24,449
Taxes (other than income taxes)	6,873	7,155
Total operating expenses	222,156	219,402
Operating income	42,775	35,448
Other income, net	246	449
Allowance for funds used during construction — equity	1,287	810
Interest charges and financing costs
Interest charges — includes other financing costs of $456 and $462, respectively	8,682	8,604
Allowance for funds used during construction — debt	(550)	(347)
Total interest charges and financing costs	8,132	8,257
Income before income taxes	36,176	28,450
Income taxes	13,757	10,819
Net income	$ 22,419	$ 17,631