CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Accounts receivable, less reserve of $1.0 and $1.5, respectively	$ 177.5	$ 188.5
Accrued unbilled revenues	57.8	66.5
Advances to parent	129.3	112.5
Fuel inventories	95.4	84.3
Materials and supplies, at average cost	101.4	80.8
Other	40.3	48.6
Total current assets	601.7	581.2
OTHER PROPERTY AND INVESTMENTS	6.0	5.9
PROPERTY, PLANT AND EQUIPMENT
In service	11,468.3	11,035.1
Construction work in progress	525.7	867.5
Total property, plant and equipment	11,994.0	11,902.6
Less accumulated depreciation	3,607.0	3,568.8
Net property, plant and equipment	8,387.0	8,333.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	275.6	283.0
Other	33.0	51.7
Total deferred charges and other assets	308.6	334.7
TOTAL ASSETS	9,303.3	9,255.6
CURRENT LIABILITIES
Accounts payable - other	171.3	216.8
Customer deposits	81.4	80.7
Accrued taxes	25.1	41.5
Accrued interest	38.9	44.0
Accrued compensation	18.4	25.6
Long-term debt due within one year	499.7	249.8
Customer Refund Liability, Current	49.9	1.7
Other	46.5	28.5
Total current liabilities	931.2	688.6
LONG-TERM DEBT	2,500.1	2,749.6
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	108.0	110.3
Deferred income taxes	840.6	832.2
Regulatory liabilities	1,292.7	1,283.4
Other	142.7	135.8
Total deferred credits and other liabilities	2,384.0	2,361.7
Total liabilities	5,815.3	5,799.9
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,028.2	1,027.2
Retained earnings	2,459.8	2,428.5
Total stockholder's equity	3,488.0	3,455.7
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 9,303.3	$ 9,255.6