STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING REVENUES	$ 2,196.9	$ 2,453.1	$ 2,262.2
COST OF SALES	865.0	1,106.6	965.9
OPERATING EXPENSES
Other operation and maintenance	444.5	453.2	438.8
Depreciation and amortization	299.9	270.8	248.4
Taxes other than income	87.1	84.5	83.8
Total operating expenses	831.5	808.5	771.0
OPERATING INCOME	500.4	538.0	525.3
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	8.3	4.2	6.6
Other income	13.3	4.8	8.1
Other expense	(1.6)	(1.9)	(4.6)
Net other income	20.0	7.1	10.1
INTEREST EXPENSE
Interest on long-term debt	146.8	139.7	130.6
Allowance for borrowed funds used during construction	(4.2)	(2.4)	(3.4)
Interest on short-term debt and other interest charges	4.1	4.2	2.1
Interest expense	146.7	141.5	129.3
INCOME BEFORE TAXES	373.7	403.6	406.1
INCOME TAX EXPENSE	104.8	111.6	113.5
NET INCOME	268.9	292.0	292.6
Other comprehensive income, net of tax of $0, $0 and $0.8	0.0	0.0	1.3
COMPREHENSIVE INCOME	$ 268.9	$ 292.0	$ 293.9