CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 238.3	$ 249.0
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	235.9	224.0
Deferred income taxes and investment tax credits	92.6	124.5
Allowance for equity funds used during construction	(9.2)	(5.4)
Stock-based compensation expense	1.7	1.9
Regulatory assets	(10.5)	12.7
Regulatory liabilities	(9.8)	(13.9)
Other assets	13.5	10.7
Other liabilities	(16.6)	(2.1)
Change in certain current assets and liabilities
Accounts receivable, net	(49.1)	(33.8)
Accrued unbilled revenues	(17.5)	(22.4)
Fuel, materials and supplies inventories	30.9	(25.6)
Fuel clause under recoveries	(0.5)	66.7
Other current assets	(12.3)	(6.5)
Accounts payable	(72.0)	(51.1)
Accounts payable - affiliates	(0.8)	0.9
Income taxes payable - parent	9.2	(32.6)
Fuel clause over recoveries	(59.9)	34.5
Other current liabilities	21.9	20.1
Net Cash Provided from Operating Activities	385.8	551.6
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(466.7)	(371.0)
Proceeds from sale of assets	0.3	2.2
Net Cash Used in Investing Activities	(466.4)	(368.8)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid on common stock	280.7	(92.7)
Payment of long-term debt	(110.1)	(0.1)
Changes in advances with parent	(90.0)	(90.0)
Net Cash Provided from (Used in) Financing Activities	80.6	(182.8)
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.0	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.0	$ 0.0