CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 13.0	$ 12.1
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	61.3	59.7
Deferred income taxes and investment tax credits, net	11.9	3.2
Allowance for equity funds used during construction	(1.2)	(1.9)
Stock-based compensation expense	0.6	0.6
Regulatory assets	5.5	5.6
Regulatory liabilities	(4.1)	(3.4)
Other assets	1.6	0.9
Other liabilities	(2.4)	1.1
Change in certain current assets and liabilities
Accounts receivable, net	15.5	38.3
Accrued unbilled revenues	7.8	6.0
Fuel, materials and supplies inventories	(15.3)	(9.8)
Gas imbalance assets	(0.6)	0
Fuel clause under recoveries	(0.4)	1.8
Other current assets	(3.9)	(5.0)
Accounts payable	20.2	(27.5)
Accounts payable - affiliates	1.4	(0.3)
Fuel clause over recoveries	(27.6)	31.5
Other current liabilities	(35.9)	(24.8)
Net Cash Provided from Operating Activities	47.4	88.1
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(195.4)	(190.1)
Reimbursement of capital expenditures	0	9.7
Proceeds from sale of assets	0.2	0.2
Net Cash Used in Investing Activities	(195.2)	(180.2)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes in advances with parent	104.7	92.1
Increase in short-term debt	43.1	0
Net Cash Provided from Financing Activities	147.8	92.1
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