CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Accounts receivable, less reserve of $1.0 and $1.5, respectively	$ 221.2	$ 188.5
Accrued unbilled revenues	87.8	66.5
Advances to parent	153.3	112.5
Fuel inventories	81.1	84.3
Materials and supplies, at average cost	130.3	80.8
Other	26.4	48.6
Total current assets	700.1	581.2
OTHER PROPERTY AND INVESTMENTS	5.8	5.9
PROPERTY, PLANT AND EQUIPMENT
In service	11,538.5	11,035.1
Construction work in progress	566.0	867.5
Total property, plant and equipment	12,104.5	11,902.6
Less accumulated depreciation	3,637.5	3,568.8
Net property, plant and equipment	8,467.0	8,333.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	270.2	283.0
Other	4.7	51.7
Total deferred charges and other assets	274.9	334.7
TOTAL ASSETS	9,447.8	9,255.6
CURRENT LIABILITIES
Accounts payable - other	149.1	216.8
Customer deposits	82.5	80.7
Accrued taxes	41.8	41.5
Accrued interest	44.0	44.0
Accrued compensation	27.4	25.6
Long-term debt due within one year	499.9	249.8
Fuel clause over recoveries	38.7	1.7
Other	76.3	28.5
Total current liabilities	959.7	688.6
LONG-TERM DEBT	2,500.4	2,749.6
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	105.0	110.3
Deferred income taxes	864.9	832.2
Regulatory liabilities	1,296.1	1,283.4
Other	140.6	135.8
Total deferred credits and other liabilities	2,406.6	2,361.7
Total liabilities	5,866.7	5,799.9
COMMITMENTS AND CONTINGENCIES (NOTE 11)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,029.3	1,027.2
Retained earnings	2,551.8	2,428.5
Total stockholder's equity	3,581.1	3,455.7
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 9,447.8	$ 9,255.6