CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total operating revenues	$ 255,997	$ 247,511	$ 760,895	$ 742,468
Operating expenses
Purchased power, affiliates	106,753	106,697	309,693	314,948
Cost of natural gas sold and transported	6,157	6,032	43,387	40,582
Operating and maintenance expenses	50,057	51,130	149,335	148,846
Conservation expenses	3,058	3,298	9,180	9,529
Depreciation and amortization	31,669	27,979	93,705	82,656
Taxes (other than income taxes)	7,107	7,124	21,473	21,002
Total operating expenses	207,987	208,441	636,419	630,200
Operating income	48,010	39,070	124,476	112,268
Interest charges and financing costs
Interest charges — includes other financing costs of $495 and $465, $1,458, and $1,382 respectively	10,109	8,647	29,467	25,985
Allowance for funds used during construction — debt	(1,172)	(726)	(3,017)	(2,025)
Total interest charges and financing costs	8,937	7,921	26,450	23,960
Other expense, net	(782)	(583)	(1,651)	(1,610)
Allowance for funds used during construction — equity	2,631	1,705	6,732	4,743
Income before income taxes	40,922	32,271	103,107	91,441
Income taxes	9,914	9,946	25,494	32,456
Net income	31,008	22,325	77,613	58,985
Electric
Total operating revenues	240,344	232,802	666,212	659,853
Operating expenses
Electric fuel and purchased power, non afiiliates	3,186	6,181	9,646	12,637
Natural gas
Total operating revenues	15,355	14,394	93,836	81,768
Other
Total operating revenues	$ 298	$ 315	$ 847	$ 847