CONDENSED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS
Accounts receivable, less reserve of $2.5 and $3.7, respectively	$ 144.1	$ 182.4
Accrued unbilled revenues	53.3	59.3
Advances to parent	5.0	97.2
Fuel inventories	86.0	76.9
Materials and supplies, at average cost	81.8	81.1
Deferred income taxes	16.8	10.3
Fuel clause under recoveries	0	1.8
Other	33.0	28.0
Total current assets	420.0	537.0
OTHER PROPERTY AND INVESTMENTS, at cost	2.6	2.7
PROPERTY, PLANT AND EQUIPMENT
In service	7,965.8	7,808.8
Construction work in progress	350.3	334.4
Total property, plant and equipment	8,316.1	8,143.2
Less accumulated depreciation	2,629.4	2,592.3
Net property, plant and equipment	5,686.7	5,550.9
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	500.5	507.9
Other	23.0	22.4
Total deferred charges and other assets	523.5	530.3
TOTAL ASSETS	6,632.8	6,620.9
CURRENT LIABILITIES
Accounts payable - affiliates	1.0	1.3
Accounts payable - other	141.9	193.4
Customer deposits	67.0	65.7
Accrued taxes	20.4	33.5
Accrued interest	30.0	43.2
Accrued compensation	22.1	26.6
Price risk management	2.5	2.2
Fuel clause over recoveries	39.2	7.7
Other	61.2	56.5
Total current liabilities	385.3	430.1
LONG-TERM DEBT	2,039.3	2,039.2
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	231.9	230.8
Deferred income taxes	1,155.6	1,146.0
Deferred investment tax credits	5.5	6.1
Regulatory liabilities	237.0	230.7
Price risk management	1.6	1.8
Other	69.9	42.2
Total deferred credits and other liabilities	1,701.5	1,657.6
Total liabilities	4,126.1	4,126.9
COMMITMENTS AND CONTINGENCIES (NOTE 9)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,012.0	1,011.4
Retained earnings	1,497.2	1,485.1
Accumulated other comprehensive loss, net of tax	(2.5)	(2.5)
Total stockholder's equity	2,506.7	2,494.0
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 6,632.8	$ 6,620.9