BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Accounts receivable, less reserve of $1.4 and $1.6, respectively	$ 173.1	$ 188.8
Accrued unbilled revenues	53.5	55.5
Advances to parent	333.6	215.6
Fuel inventories	113.8	58.5
Materials and supplies, at average cost	78.8	77.9
Deferred income taxes	0.0	170.8
Fuel clause under recoveries	0.0	68.3
Other	51.6	35.6
Total current assets	804.4	871.0
OTHER PROPERTY AND INVESTMENTS	5.6	2.9
PROPERTY, PLANT AND EQUIPMENT
In service	10,179.3	9,835.6
Construction work in progress	278.5	111.6
Total property, plant and equipment	10,457.8	9,947.2
Less accumulated depreciation	3,161.7	3,005.7
Net property, plant and equipment	7,296.1	6,941.5
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	402.2	410.4
Other	33.5	40.4
Total deferred charges and other assets	435.7	450.8
TOTAL ASSETS	8,541.8	8,266.2
CURRENT LIABILITIES
Accounts payable - affiliates	2.2	0.3
Accounts payable - other	236.0	163.0
Customer deposits	77.0	73.7
Accrued taxes	45.7	38.8
Accrued interest	42.8	42.9
Accrued compensation	23.8	22.6
Long-term debt due within one year	110.0	0.0
Fuel clause over recoveries	61.3	0.0
Other	43.6	51.6
Total current liabilities	642.4	392.9
LONG-TERM DEBT	2,545.6	2,655.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	179.9	178.3
Deferred income taxes	1,637.8	1,686.6
Regulatory liabilities	272.6	263.0
Other	107.8	85.9
Total deferred credits and other liabilities	2,198.1	2,213.8
Total liabilities	$ 5,386.1	$ 5,262.0
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDER'S EQUITY
Common stockholder's equity	$ 1,021.8	$ 1,019.2
Retained earnings	2,133.9	1,985.0
Total stockholder's equity	3,155.7	3,004.2
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 8,541.8	$ 8,266.2