CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Accounts receivable, less reserve of $2.0 and $1.4, respectively	$ 222.2	$ 173.1
Accrued unbilled revenues	71.0	53.5
Advances to parent	8.6	333.6
Fuel inventories	87.6	113.8
Materials and supplies, at average cost	74.1	78.8
Fuel clause under recoveries	0.5	0.0
Other	63.9	51.6
Total current assets	527.9	804.4
OTHER PROPERTY AND INVESTMENTS	5.2	5.6
PROPERTY, PLANT AND EQUIPMENT
In service	10,482.1	10,179.3
Construction work in progress	365.8	278.5
Total property, plant and equipment	10,847.9	10,457.8
Less accumulated depreciation	3,328.9	3,161.7
Net property, plant and equipment	7,519.0	7,296.1
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	404.8	402.2
Other	54.6	17.2
Total deferred charges and other assets	459.4	419.4
TOTAL ASSETS	8,511.5	8,525.5
CURRENT LIABILITIES
Accounts payable - affiliates	1.4	2.2
Accounts payable - other	121.4	236.0
Customer deposits	77.4	77.0
Accrued taxes	58.2	45.7
Accrued interest	32.8	42.8
Accrued compensation	23.9	23.8
Long-term debt due within one year	124.9	110.0
Fuel clause over recoveries	1.4	61.3
Other	62.5	43.6
Total current liabilities	503.9	642.4
LONG-TERM DEBT	2,405.4	2,529.3
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	176.1	179.9
Deferred income taxes	1,728.8	1,637.8
Regulatory liabilities	292.0	273.6
Other	134.6	106.8
Total deferred credits and other liabilities	2,331.5	2,198.1
Total liabilities	5,240.8	5,369.8
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,023.5	1,021.8
Retained earnings	2,247.2	2,133.9
Total stockholder's equity	3,270.7	3,155.7
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 8,511.5	$ 8,525.5