Commission
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Registrant;
State of Incorporation;
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I.R.S.
Employer
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File
Number
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Address;
and Telephone Number
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Identification
No.
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333-21011
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FIRSTENERGY
CORP.
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34-1843785
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(An
Ohio Corporation)
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76
South Main Street
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Akron,
OH 44308
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Telephone
(800)736-3402
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Exhibit
No.
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Description
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99.1
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Supplemental
Information Regarding the FENOC Response to Demand for
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Information,
dated July 16, 2007
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FIRSTENERGY
CORP.
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Registrant
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By:
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/s/ Harvey
L. Wagner
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Harvey
L.
Wagner
Vice
President, Controller and
Chief
Accounting Officer
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