CONDENSED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
OPERATING REVENUES	$ 721.0	$ 774.8	$ 1,675.7	$ 1,765.6
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)	271.8	334.7	671.9	808.4
Gross margin on revenues	449.2	440.1	1,003.8	957.2
OPERATING EXPENSES
Other operation and maintenance	108.6	108.3	333.9	324.3
Depreciation and amortization	63.5	54.9	185.9	158.8
Taxes other than income	19.1	18.2	58.4	56.1
Total operating expenses	191.2	181.4	578.2	539.2
OPERATING INCOME	258.0	258.7	425.6	418.0
OTHER INCOME (EXPENSE)
Interest income	0.1	0.2	0.2	0.4
Allowance for equity funds used during construction	1.3	5.9	4.9	16.1
Other income (loss)	(0.4)	(3.1)	5.5	3.2
Other expense	(2.2)	(3.4)	(3.5)	(4.9)
Net other income (expense)	(1.2)	(0.4)	7.1	14.8
INTEREST EXPENSE
Interest on long-term debt	31.0	31.0	93.1	87.9
Allowance for borrowed funds used during construction	(0.8)	(2.9)	(2.8)	(8.1)
Interest on short-term debt and other interest charges	1.0	0.7	2.9	2.4
Interest expense	31.2	28.8	93.2	82.2
INCOME BEFORE TAXES	225.6	229.5	339.5	350.6
INCOME TAX EXPENSE	58.4	70.9	86.8	107.0
NET INCOME	$ 167.2	$ 158.6	$ 252.7	$ 243.6