BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS
Accounts receivable, less reserve of $2.6 and $3.7, respectively	$ 161.5	$ 182.4
Accrued unbilled revenues	57.4	59.3
Advances to parent	90.3	97.2
Fuel inventories	76.8	76.9
Materials and supplies, at average cost	74.7	81.1
Deferred income taxes	138.7	10.3
Fuel clause under recoveries	0	1.8
Other	34.6	28.0
Total current assets	634.0	537.0
OTHER PROPERTY AND INVESTMENTS, at cost	2.7	2.7
PROPERTY, PLANT AND EQUIPMENT
In service	8,498.3	7,808.8
Construction work in progress	251.4	334.4
Total property, plant and equipment	8,749.7	8,143.2
Less accumulated depreciation	2,705.6	2,592.3
Net property, plant and equipment	6,044.1	5,550.9
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	510.6	507.9
Other	31.0	22.4
Total deferred charges and other assets	541.6	530.3
TOTAL ASSETS	7,222.4	6,620.9
CURRENT LIABILITIES
Accounts payable - affiliates	0.7	1.3
Accounts payable - other	186.7	193.4
Customer deposits	68.5	65.7
Accrued taxes	35.0	33.5
Accrued interest	43.2	43.2
Accrued compensation	33.2	26.6
Price risk management	2.1	2.2
Fuel clause over recoveries	109.2	7.7
Other	53.9	56.5
Total current liabilities	532.5	430.1
LONG-TERM DEBT	2,050.3	2,039.2
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	240.9	230.8
Deferred income taxes	1,377.8	1,146.0
Deferred investment tax credits	3.9	6.1
Regulatory liabilities	245.1	230.7
Price risk management	0	1.8
Other	68.8	42.2
Total deferred credits and other liabilities	1,936.5	1,657.6
Total liabilities	4,519.3	4,126.9
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,014.0	1,011.4
Retained earnings	1,690.4	1,485.1
Accumulated other comprehensive loss, net of tax	(1.3)	(2.5)
Total stockholder's equity	2,703.1	2,494.0
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 7,222.4	$ 6,620.9