CONDENSED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATING REVENUES	$ 723.2	$ 721.0	$ 1,753.3	$ 1,675.7
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)	273.0	271.8	733.6	671.9
Gross margin on revenues	450.2	449.2	1,019.7	1,003.8
OPERATING EXPENSES
Other operation and maintenance	105.9	108.6	318.0	333.9
Depreciation and amortization	62.5	63.5	185.8	185.9
Taxes other than income	20.8	19.1	63.9	58.4
Total operating expenses	189.2	191.2	567.7	578.2
OPERATING INCOME	261.0	258.0	452.0	425.6
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	1.7	1.3	4.4	4.9
Other income (loss)	2.9	(0.3)	6.4	5.7
Other expense	(0.5)	(2.2)	(1.3)	(3.5)
Net other income (expense)	4.1	(1.2)	9.5	7.1
INTEREST EXPENSE
Interest on long-term debt	33.5	31.0	97.0	93.1
Allowance for borrowed funds used during construction	(0.9)	(0.8)	(2.3)	(2.8)
Interest on short-term debt and other interest charges	(1.0)	1.0	1.3	2.9
Interest expense	31.6	31.2	96.0	93.2
INCOME BEFORE TAXES	233.5	225.6	365.5	339.5
INCOME TAX EXPENSE	62.0	58.4	102.0	86.8
NET INCOME	$ 171.5	$ 167.2	$ 263.5	$ 252.7