CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Accounts receivable, less reserve of $1.5 and $3.7, respectively	$ 195.8	$ 182.4
Accrued unbilled revenues	84.6	59.3
Advances to parent	0	97.2
Fuel inevntories	82.9	76.9
Materials and supplies, at average cost	84.2	81.1
Gas imbalances	0.3	0
Deferred income taxes	45.3	10.3
Fuel clause under recoveries	0.7	1.8
Other	40.9	28.0
Total current assets	534.7	537.0
OTHER PROPERTY AND INVESTMENTS, at cost	2.7	2.7
PROPERTY, PLANT AND EQUIPMENT
In service	8,248.4	7,808.8
Construction work in progress	195.9	334.4
Total property, plant and equipment	8,444.3	8,143.2
Less accumulated depreciation	2,665.9	2,592.3
Net property, plant and equipment	5,778.4	5,550.9
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	494.1	507.9
Other	23.3	22.4
Total deferred charges and other assets	517.4	530.3
TOTAL ASSETS	6,833.2	6,620.9
CURRENT LIABILITIES
Accounts payable - affiliates	1.6	1.3
Accounts payable - other	143.8	193.4
Advances from parent	22.2	0
Customer deposits	67.6	65.7
Accrued taxes	35.4	33.5
Accrued interest	43.2	43.2
Accrued compensation	22.5	26.6
Price risk management	2.2	2.2
Fuel clause over recoveries	65.4	7.7
Other	72.8	56.5
Total current liabilities	476.7	430.1
LONG-TERM DEBT	2,039.4	2,039.2
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	199.6	230.8
Deferred income taxes	1,218.3	1,146.0
Deferred investment tax credits	5.0	6.1
Regulatory liabilities	242.5	230.7
Price risk management	1.0	1.8
Other	69.5	42.2
Total deferred credits and other liabilities	1,735.9	1,657.6
Total liabilities	4,252.0	4,126.9
COMMITMENTS AND CONTINGENCIES (NOTE 9)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,012.6	1,011.4
Retained earnings	1,570.6	1,485.1
Accumulated other comprehensive loss, net of tax	(2.0)	(2.5)
Total stockholder's equity	2,581.2	2,494.0
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 6,833.2	$ 6,620.9