CONDENSED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
OPERATING REVENUES	$ 574.6	$ 528.0	$ 1,030.1	$ 954.7
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)	247.6	204.6	460.6	400.1
Gross margin on revenues	327.0	323.4	569.5	554.6
OPERATING EXPENSES
Other operation and maintenance	107.0	114.7	212.1	225.3
Depreciation and amortization	62.0	62.7	123.3	122.4
Taxes other than income	19.9	18.2	43.1	39.3
Total operating expenses	188.9	195.6	378.5	387.0
OPERATING INCOME	138.1	127.8	191.0	167.6
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	1.5	1.7	2.7	3.6
Other income	0.8	0.8	3.5	6.0
Other expense	(0.3)	(0.6)	(0.8)	(1.3)
Net other income	2.0	1.9	5.4	8.3
INTEREST EXPENSE
Interest on long-term debt	32.4	31.1	63.5	62.1
Allowance for borrowed funds used during construction	(0.7)	(0.9)	(1.4)	(2.0)
Interest on short-term debt and other interest charges	1.3	0.9	2.3	1.9
Interest expense	33.0	31.1	64.4	62.0
INCOME BEFORE TAXES	107.1	98.6	132.0	113.9
INCOME TAX EXPENSE	28.1	25.2	40.0	28.4
NET INCOME	$ 79.0	$ 73.4	$ 92.0	$ 85.5