CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Accounts receivable, less reserve of $2.0 and $2.6, respectively	$ 257.2	$ 161.5
Accrued unbilled revenues	70.7	57.4
Advances to parent	0	90.3
Fuel inventories	75.5	76.8
Materials and supplies, at average cost	78.2	74.7
Deferred income taxes	198.4	138.7
Other	28.5	34.6
Total current assets	708.5	634.0
OTHER PROPERTY AND INVESTMENTS	2.6	2.7
PROPERTY, PLANT AND EQUIPMENT
In service	8,783.9	8,498.3
Construction work in progress	496.0	251.4
Total property, plant and equipment	9,279.9	8,749.7
Less accumulated depreciation	2,823.9	2,705.6
Net property, plant and equipment	6,456.0	6,044.1
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	496.2	510.6
Other	40.7	31.0
Total deferred charges and other assets	536.9	541.6
TOTAL ASSETS	7,704.0	7,222.4
CURRENT LIABILITIES
Accounts payable - affiliates	1.0	0.7
Accounts payable - other	162.4	186.7
Advances from parent	47.6	0
Customer deposits	69.5	68.5
Accrued taxes	56.3	35.0
Accrued interest	31.7	43.2
Accrued compensation	28.5	33.2
Fuel clause over recoveries	12.0	109.2
Other	56.2	56.0
Total current liabilities	465.2	532.5
LONG-TERM DEBT	2,300.1	2,050.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	235.3	240.9
Deferred income taxes	1,539.0	1,377.8
Deferred investment tax credits	2.4	3.9
Regulatory liabilities	242.7	245.1
Other	70.0	68.8
Total deferred credits and other liabilities	2,089.4	1,936.5
Total liabilities	4,854.7	4,519.3
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,015.7	1,014.0
Retained earnings	1,833.9	1,690.4
Accumulated other comprehensive loss, net of tax	(0.3)	(1.3)
Total stockholder's equity	2,849.3	2,703.1
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 7,704.0	$ 7,222.4