CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total operating revenues	$ 276,200	$ 273,100
Operating expenses
Related Party Transaction, Utilities Operating Expense, Purchased Power	103,500	101,300
Operating and maintenance expenses	52,000	50,300
Conservation expenses	3,000	3,000
Depreciation and amortization	34,000	30,600
Taxes (other than income taxes)	7,500	7,300
Total operating expenses	234,200	224,100
Operating income	42,000	49,000
Interest charges and financing costs
Interest charges — includes other financing costs of $0.3 and $0.5 respectively	10,000	9,600
Allowance for funds used during construction — debt	(300)	(800)
Total interest charges and financing costs	9,700	8,800
Other expense, net	(400)	(400)
Allowance for funds used during construction — equity	600	1,900
Income before income taxes	32,500	41,700
Income taxes	8,500	10,300
Net income	24,000	31,400
Electric, non-affiliates
Total operating revenues	170,900	178,700
Affiliate Revenue	44,100	37,600
Operating expenses
Electric fuel and purchased power, non afiiliates	1,900	2,900
Natural gas
Total operating revenues	61,100	56,500
Operating expenses
Electric fuel and purchased power, non afiiliates	32,300	28,700
Other
Total operating revenues	$ 100	$ 300