CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Accounts receivable, less reserve of $1.2 and $1.6, respectively	$ 169.2	$ 188.8
Accrued unbilled revenues	46.5	55.5
Advances to parent	201.6	215.6
Fuel inventories	82.6	58.5
Materials and supplies, at average cost	77.8	77.9
Deferred income taxes	170.0	170.8
Fuel clause under recoveries	27.0	68.3
Other	31.6	34.5
Total current assets	806.3	869.9
OTHER PROPERTY AND INVESTMENTS	3.1	2.9
PROPERTY, PLANT AND EQUIPMENT
In service	9,878.1	9,835.6
Construction work in progress	145.1	111.6
Total property, plant and equipment	10,023.2	9,947.2
Less accumulated depreciation	3,045.4	3,005.7
Net property, plant and equipment	6,977.8	6,941.5
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	406.7	411.5
Other	41.0	40.4
Total deferred charges and other assets	447.7	451.9
TOTAL ASSETS	8,234.9	8,266.2
CURRENT LIABILITIES
Accounts payable - affiliates	1.5	0.3
Accounts payable - other	146.0	163.0
Customer deposits	75.2	73.7
Accrued taxes	23.5	38.8
Accrued interest	34.1	42.9
Accrued compensation	23.5	22.6
Long-term debt due within one year	110.0	0
Other	52.9	51.6
Total current liabilities	466.7	392.9
LONG-TERM DEBT	2,545.4	2,655.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	176.3	178.3
Deferred income taxes	1,694.4	1,686.6
Regulatory liabilities	271.6	263.0
Other	88.4	85.9
Total deferred credits and other liabilities	2,230.7	2,213.8
Total liabilities	5,242.8	5,262.0
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,020.0	1,019.2
Retained earnings	1,972.1	1,985.0
Total stockholder's equity	2,992.1	3,004.2
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 8,234.9	$ 8,266.2