CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenues
Electric, non-affiliates	$ 908,747	$ 881,279
Electric, affiliates	124,896	124,875
Natural gas	194,130	279,467
Other	6,860	6,861
Total operating revenues	1,234,633	1,292,482
Operating expenses
Electric fuel and purchased power	366,166	398,720
Cost of natural gas sold and transported	120,223	201,189
Cost of sales — other	4,432	4,327
Operating and maintenance expenses	320,496	314,050
Conservation program expenses	23,269	17,212
Depreciation and amortization	145,797	118,075
Taxes (other than income taxes)	70,352	63,832
Loss on Monticello life cycle management/extended power uprate project	0	124,226
Total operating expenses	1,050,735	1,241,631
Operating income	183,898	50,851
Other income, net	2,860	1,962
Allowance for funds used during construction — equity	5,648	5,930
Interest charges and financing costs
Interest charges — includes other financing costs of $1,742 and $1,610, respectively	54,015	51,763
Allowance for funds used during construction — debt	(2,706)	(2,914)
Total interest charges and financing costs	51,309	48,849
Income before income taxes	141,097	9,894
Income taxes	46,468	2,970
Net income	$ 94,629	$ 6,924	[1]

[1] Includes a net of tax charge related to the Monticello LCM/EPU project. See Note 5.