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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FA2rRwr6XUJcVb3zoI7GF0DDGSLMtR2Ix2PyaI+VOdpADFqsYsvSbSidpuPE+vdR
 TspBpVm4yAfra3vcoRPQmQ==

<SEC-DOCUMENT>0001031296-03-000193.txt : 20030822
<SEC-HEADER>0001031296-03-000193.hdr.sgml : 20030822
<ACCEPTANCE-DATETIME>20030822153803
ACCESSION NUMBER:		0001031296-03-000193
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030822
FILED AS OF DATE:		20030822

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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SMART GEORGE M
		CENTRAL INDEX KEY:			0001016653

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-21011
		FILM NUMBER:		03862478

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

	MAIL ADDRESS:	
		STREET 1:		FIRSTENERGY CORP
		STREET 2:		76 SOUTH MAIN ST
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c0001016653d20030822f4f.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-08-22</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001031296</issuerCik><issuerName>FIRSTENERGY CORP</issuerName>        <issuerTradingSymbol>FE</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001016653</rptOwnerCik><rptOwnerName>SMART GEORGE M</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></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativ
eHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3210.902</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-08-22</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>2000</value></transactionShares><transactionPricePerShare><value>28.15</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDis
posedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>2000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Spouse</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><derivativeTable></derivativeTable><footnotes></footnotes><ownerSignature><signatureName>David W. Whitehead, POA</signatureName><signatureDate>2003-08-22</signatureDate></ownerSignature></ownershipDocument>

</XML>
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</DOCUMENT>
</SEC-DOCUMENT>
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