CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenues
Electric	$ 211,524	$ 210,284
Natural gas	43,020	63,296
Other	306	380
Total operating revenues	254,850	273,960
Operating expenses
Electric fuel and purchased power, non-affiliates	3,981	1,283
Purchased power, affiliates	108,714	111,832
Cost of natural gas sold and transported	23,418	42,438
Operating and maintenance expenses	48,619	42,173
Conservation program expenses	3,066	2,855
Depreciation and amortization	24,449	21,361
Taxes (other than income taxes)	7,155	7,232
Loss on Monticello life cycle management/extended power uprate project	0	5,237
Total operating expenses	219,402	234,411
Operating income	35,448	39,549
Other income, net	449	249
Allowance for funds used during construction — equity	810	2,219
Interest charges and financing costs
Interest charges — includes other financing costs of $462 and $402, respectively	8,604	7,756
Allowance for funds used during construction — debt	(347)	(1,070)
Total interest charges and financing costs	8,257	6,686
Income before income taxes	28,450	35,331
Income taxes	10,819	13,064
Net income	$ 17,631	$ 22,267