CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating revenues
Electric	$ 210,284	$ 211,097
Natural gas	63,296	73,791
Other	380	254
Total operating revenues	273,960	285,142
Operating expenses
Electric fuel and purchased power, non-affiliates	1,283	8,851
Purchased power, affiliates	111,832	109,571
Cost of natural gas sold and transported	42,438	51,142
Operating and maintenance expenses	42,173	44,231
Conservation program expenses	2,855	2,672
Depreciation and amortization	21,361	19,307
Taxes (other than income taxes)	7,232	6,797
Loss on Monticello life cycle management/extended power uprate project	5,237	0
Total operating expenses	234,411	242,571
Operating income	39,549	42,571
Other income, net	249	124
Allowance for funds used during construction — equity	2,219	1,572
Interest charges and financing costs
Interest charges — includes other financing costs of $402 and $374, respectively	7,756	6,867
Allowance for funds used during construction — debt	(1,070)	(758)
Total interest charges and financing costs	6,686	6,109
Income before income taxes	35,331	38,158
Income taxes	13,064	13,923
Net income	$ 22,267	$ 24,235