CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Accounts receivable, less reserve of $1.1 and $1.5, respectively	$ 136.4	$ 173.0
Accrued unbilled revenues	56.2	59.7
Advances to parent	86.0	0.0
Fuel inventories	86.3	79.8
Materials and supplies, at average cost	81.5	80.3
Fuel clause under recoveries	73.4	51.3
Other	77.6	78.3
Total current assets	597.4	522.4
OTHER PROPERTY AND INVESTMENTS	6.4	6.6
PROPERTY, PLANT AND EQUIPMENT
In service	10,631.0	10,572.3
Construction work in progress	673.3	495.1
Total property, plant and equipment	11,304.3	11,067.4
Less accumulated depreciation	3,415.0	3,385.6
Net property, plant and equipment	7,889.3	7,681.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	403.1	404.8
Other	54.7	53.8
Total deferred charges and other assets	457.8	458.6
TOTAL ASSETS	8,950.9	8,669.4
CURRENT LIABILITIES
Accounts payable - affiliates	0.2	0.1
Accounts payable - other	236.6	196.3
Advances from parent	0.0	49.9
Customer deposits	78.6	77.7
Accrued taxes	24.2	40.8
Accrued interest	32.8	40.2
Accrued compensation	17.9	31.3
Long-term debt due within one year	125.0	125.0
Other	94.7	95.8
Total current liabilities	610.0	657.1
LONG-TERM DEBT	2,703.2	2,405.8
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	166.8	167.7
Deferred income taxes	1,759.0	1,752.3
Regulatory liabilities	306.7	299.7
Other	136.1	134.7
Total deferred credits and other liabilities	2,368.6	2,354.4
Total liabilities	5,681.8	5,417.3
COMMITMENTS AND CONTINGENCIES (NOTE 10)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,024.9	1,024.1
Retained earnings	2,244.2	2,228.0
Total stockholder's equity	3,269.1	3,252.1
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 8,950.9	$ 8,669.4