CONDENSED STATEMENTS OF INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING REVENUES	$ 426.7	$ 422.1
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)	195.5	219.4
Gross margin on revenues	231.2	202.7
OPERATING EXPENSES
Other operation and maintenance	110.6	105.8
Depreciation and amortization	59.7	51.8
Taxes other than income	21.1	19.1
Total operating expenses	191.4	176.7
OPERATING INCOME	39.8	26.0
OTHER INCOME (EXPENSE)
Interest income	0	0.1
Allowance for equity funds used during construction	1.9	4.4
Other income	5.2	5.0
Other expense	(0.7)	(0.6)
Net other income	6.4	8.9
INTEREST EXPENSE
Interest on long-term debt	31.0	27.8
Allowance for borrowed funds used during construction	(1.1)	(2.3)
Interest on short-term debt and other interest charges	1.0	0.6
Interest expense	30.9	26.1
INCOME BEFORE TAXES	15.3	8.8
INCOME TAX EXPENSE	3.2	2.4
NET INCOME	$ 12.1	$ 6.4