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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Tv+1bFBMGWeqf/VJcoL4criIemVtjXUTZEWzr4n5C8AbNvVS8cJMETflE3Aukdhy
 DGx3Sfmthh5WbBTZ4JzQWw==

<SEC-DOCUMENT>0001031296-03-000250.txt : 20031010
<SEC-HEADER>0001031296-03-000250.hdr.sgml : 20031010
<ACCEPTANCE-DATETIME>20031010172638
ACCESSION NUMBER:		0001031296-03-000250
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031008
FILED AS OF DATE:		20031010

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			REIN CATHERIN A
		CENTRAL INDEX KEY:			0001176294

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-21011
		FILM NUMBER:		03937672

	BUSINESS ADDRESS:	
		STREET 1:		C/O FIRSTENERGY CORP
		STREET 2:		76 SOUTH MAIN ST
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308
		BUSINESS PHONE:		3307614264

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRSTENERGY CORP
		CENTRAL INDEX KEY:			0001031296
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				341843785
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		76 SOUTH MAIN ST
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308-1890
		BUSINESS PHONE:		3303845100

	MAIL ADDRESS:	
		STREET 1:		76 SOUTH MAIN ST
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308-1890
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>c0001176294d20031010f4af.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4/A</documentType><periodOfReport>2003-10-08</periodOfReport><dateOfOriginalSubmission>2003-10-10</dateOfOriginalSubmission><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001031296</issuerCik><issuerName>FIRSTENERGY CORP</issuerName>        <issuerTradingSymbol>FE</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001176294</rptOwnerCik><rptOwnerName>REIN CATHERIN A</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>76 SOUTH MAIN STREET</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>AKRON</rptOwnerCity><rptOwnerState>OH</rptOwnerState><rptOwnerZipCode>44308</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOw
nerRelationship></reportingOwner><nonDerivativeTable></nonDerivativeTable><derivativeTable><derivativeTransaction><securityTitle><value>Phantom Stock Units</value></securityTitle><conversionOrExercisePrice><value>1</value><footnoteId id="F1"/></conversionOrExercisePrice><transactionDate><value>2003-10-08</value><footnoteId id="F2"/></transactionDate><deemedExecutionDate><value>2003-10-09</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>306</value></transactionShares><transactionPricePerShare><value>32.76</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>1988-08-08</value><footnoteId id="F3"/></exerciseDate><expirationDate><value>1988-08-08</value><footnoteId id="F3"/></expirationDate><underlyingSecurity><underlyingSec
urityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>306</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>13044.3111</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By State Street</value></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">1 for 1</footnote><footnote id="F2">This amendment corrects the date of the actual transaction which should have been reported as October 8, 2003.  The date of October 9, 2003 was inadvertently reported due to an administrative error.</footnote><footnote id="F3">In accordance with the terms and conditions of the FirstEnergy Corp. Deferred Compensation plan for Outside Directors.</footnote></footnotes><ownerSignature><signatureName>David W. Whitehead, POA</signatureName><signa
tureDate>2003-10-10</signatureDate></ownerSignature></ownershipDocument>

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</TEXT>
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</SEC-DOCUMENT>
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