CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
CURRENT ASSETS
Accounts receivable, less reserve of $1.5 and $1.6, respectively	$ 222.6	$ 188.8
Accrued unbilled revenues	77.9	55.5
Advances to parent	340.9	215.6
Fuel inventories	86.2	58.5
Materials and supplies, at average cost	75.8	77.9
Deferred income taxes	164.7	170.8
Fuel clause under recoveries	1.6	68.3
Other	42.1	35.6
Total current assets	1,011.8	871.0
OTHER PROPERTY AND INVESTMENTS	4.6	2.9
PROPERTY, PLANT AND EQUIPMENT
In service	10,055.6	9,835.6
Construction work in progress	222.9	111.6
Total property, plant and equipment	10,278.5	9,947.2
Less accumulated depreciation	3,148.1	3,005.7
Net property, plant and equipment	7,130.4	6,941.5
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	389.7	410.4
Other	34.2	40.4
Total deferred charges and other assets	423.9	450.8
TOTAL ASSETS	8,570.7	8,266.2
CURRENT LIABILITIES
Accounts payable - affiliates	1.2	0.3
Accounts payable - other	116.0	163.0
Customer deposits	76.0	73.7
Accrued taxes	61.1	38.8
Accrued interest	34.0	42.9
Accrued compensation	25.7	22.6
Long-term debt due within one year	110.0	0.0
Fuel clause over recoveries	34.5	0.0
Other	52.9	51.6
Total current liabilities	511.4	392.9
LONG-TERM DEBT	2,545.5	2,655.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	173.0	178.3
Deferred income taxes	1,802.2	1,686.6
Regulatory liabilities	277.0	263.0
Other	96.5	85.9
Total deferred credits and other liabilities	2,348.7	2,213.8
Total liabilities	$ 5,405.6	$ 5,262.0
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	$ 1,021.1	$ 1,019.2
Retained earnings	2,144.0	1,985.0
Total stockholder's equity	3,165.1	3,004.2
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 8,570.7	$ 8,266.2