CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 263.5	$ 252.7
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	185.8	185.9
Deferred income taxes and investment tax credits, net	100.8	95.1
Allowance for equity funds used during construction	(4.4)	(4.9)
Stock-based compensation expense	1.8	1.8
Regulatory assets	7.4	17.5
Regulatory liabilities	(16.9)	(12.8)
Other assets	(4.9)	(3.4)
Other liabilities	(5.4)	(32.2)
Change in certain current assets and liabilities
Accounts receivable, net	(95.7)	(85.2)
Accrued unbilled revenues	(13.3)	(3.2)
Fuel, materials and supplies inventories	(2.2)	4.7
Fuel clause under recoveries	0	1.0
Other current assets	6.1	(11.3)
Accounts payable	(17.7)	(47.7)
Accounts payable - affiliates	0.3	(1.3)
Income taxes payable - parent	6.1	(7.1)
Fuel clause over recoveries	(97.2)	99.4
Other current liabilities	7.8	29.5
Net Cash Provided from Operating Activities	321.9	478.5
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(581.6)	(495.8)
Reimbursement of capital expenditures	0	28.2
Proceeds from sale of assets	0.7	0.5
Net Cash Used in Investing Activities	(580.9)	(467.1)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	247.4	0
Changes in advances with parent	91.8	(11.4)
Payment of long-term debt	(0.2)	0
Dividends paid on common stock	(80.0)	0
Net Cash Provided from (Used in) Financing Activities	259.0	(11.4)
NET CHANGE IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0	$ 0