CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Accounts receivable, less reserve of $1.5 and $2.6, respectively	$ 186.2	$ 161.5
Accrued unbilled revenues	83.2	57.4
Advances to parent	0	90.3
Fuel inevntories	98.7	76.8
Materials and supplies, at average cost	80.2	74.7
Deferred income taxes	85.0	138.7
Fuel clause under recoveries	1.7	0
Other	34.8	34.6
Total current assets	569.8	634.0
OTHER PROPERTY AND INVESTMENTS	2.7	2.7
PROPERTY, PLANT AND EQUIPMENT
In service	8,709.2	8,498.3
Construction work in progress	416.8	251.4
Total property, plant and equipment	9,126.0	8,749.7
Less accumulated depreciation	2,779.1	2,705.6
Net property, plant and equipment	6,346.9	6,044.1
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	501.9	510.6
Other	32.3	31.0
Total deferred charges and other assets	534.2	541.6
TOTAL ASSETS	7,453.6	7,222.4
CURRENT LIABILITIES
Accounts payable - unconsolidated affiliates	0.8	0
Accounts payable - affiliates	0	0.7
Accounts payable - other	211.1	186.7
Advances from parent	39.0	0
Customer deposits	69.7	68.5
Accrued taxes	38.2	35.0
Accrued interest	44.5	43.2
Accrued compensation	21.7	33.2
Fuel clause over recoveries	21.8	109.2
Other	60.2	56.0
Total current liabilities	507.0	532.5
LONG-TERM DEBT	2,300.3	2,050.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	237.0	240.9
Deferred income taxes	1,375.2	1,377.8
Deferred investment tax credits	2.9	3.9
Regulatory liabilities	244.4	245.1
Other	69.9	68.8
Total deferred credits and other liabilities	1,929.4	1,936.5
Total liabilities	4,736.7	4,519.3
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,015.1	1,014.0
Retained earnings	1,702.4	1,690.4
Accumulated other comprehensive loss, net of tax	(0.6)	(1.3)
Total stockholder's equity	2,716.9	2,703.1
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 7,453.6	$ 7,222.4