BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Accounts receivable, less reserve of $1.7 and $1.5, respectively	$ 172.9	$ 188.5
Accrued unbilled revenues	62.6	66.5
Advances to parent	319.5	112.5
Fuel inventories	57.6	84.3
Materials and supplies, at average cost	126.7	80.8
Fuel clause under recoveries	2.0	0.0
Other	25.5	48.6
Total current assets	766.8	581.2
OTHER PROPERTY AND INVESTMENTS	5.0	5.9
PROPERTY, PLANT AND EQUIPMENT
In service	11,988.7	11,035.1
Construction work in progress	376.4	867.5
Total property, plant and equipment	12,365.1	11,902.6
Less accumulated depreciation	3,727.4	3,568.8
Net property, plant and equipment	8,637.7	8,333.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	285.8	283.0
Other	9.2	51.7
Total deferred charges and other assets	295.0	334.7
TOTAL ASSETS	9,704.5	9,255.6
CURRENT LIABILITIES
Accounts payable	215.0	216.8
Customer deposits	83.6	80.7
Accrued taxes	44.0	41.5
Accrued interest	44.5	44.0
Accrued compensation	33.8	25.6
Long-term debt due within one year	250.0	249.8
Fuel clause over recoveries	0.3	1.7
Other	86.8	28.5
Total current liabilities	758.0	688.6
LONG-TERM DEBT	2,896.9	2,749.6
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	137.9	110.3
Deferred income taxes	892.7	832.2
Regulatory liabilities	1,270.7	1,283.4
Other	145.0	135.8
Total deferred credits and other liabilities	2,446.3	2,361.7
Total liabilities	6,101.2	5,799.9
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,031.8	1,027.2
Retained earnings	2,571.5	2,428.5
Total stockholder's equity	3,603.3	3,455.7
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 9,704.5	$ 9,255.6