<SEC-DOCUMENT>0001127602-23-004998.txt : 20230213
<SEC-HEADER>0001127602-23-004998.hdr.sgml : 20230213
<ACCEPTANCE-DATETIME>20230213193735
ACCESSION NUMBER:		0001127602-23-004998
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230209
FILED AS OF DATE:		20230213
DATE AS OF CHANGE:		20230213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			K. Jon Taylor
		CENTRAL INDEX KEY:			0001575883

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-21011
		FILM NUMBER:		23621132

	BUSINESS ADDRESS:	
		STREET 1:		76 SOUTH MAIN STREET
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308
		BUSINESS PHONE:		330-761-2355

	MAIL ADDRESS:	
		STREET 1:		76 SOUTH MAIN STREET
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308

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:		330-761-7837

	MAIL ADDRESS:	
		STREET 1:		76 SOUTH MAIN ST
		CITY:			AKRON
		STATE:			OH
		ZIP:			44308-1890
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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    <schemaVersion>X0306</schemaVersion>

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    <periodOfReport>2023-02-09</periodOfReport>

    <issuer>
        <issuerCik>0001031296</issuerCik>
        <issuerName>FIRSTENERGY CORP</issuerName>
        <issuerTradingSymbol>FE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001575883</rptOwnerCik>
            <rptOwnerName>K. Jon Taylor</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>76 SOUTH MAIN STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>AKRON</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44308</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>SVP, CFO and Strategy</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20298.145</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4305.207</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Savings Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>15PSUC20</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2023-03-01</value>
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            <expirationDate>
                <value>2023-03-01</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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        </derivativeTransaction>
        <derivativeTransaction>
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            <conversionOrExercisePrice>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
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            <securityTitle>
                <value>Phantom 3/17D</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>19156.205</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19156.205</value>
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                <directOrIndirectOwnership>
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        <derivativeHolding>
            <securityTitle>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5691.955</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5691.955</value>
                    <footnoteId id="F6"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19943.09</value>
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            </underlyingSecurity>
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            <underlyingSecurity>
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                    <value>Common Stock</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Phantom 3/21D</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>14724.467</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Phantom 3/22D</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10295.934</value>
                </underlyingSecurityShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10295.934</value>
                    <footnoteId id="F6"/>
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                <directOrIndirectOwnership>
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        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Balance includes shares acquired through dividend reinvestment.</footnote>
        <footnote id="F2">FirstEnergy Corp.'s 401(k) Savings Plan includes a unitized fund invested in FirstEnergy Corp. stock, in which the reporting person may invest, and includes dividend reinvestment and company match features. The number of shares reported as indirectly held in FirstEnergy Corp.'s 401(k) Savings Plan in this row is an estimate of the number of shares of FirstEnergy Corp.'s common stock held in the unitized stock fund and allocated to the reporting person's account as of Dec 31, 2022.</footnote>
        <footnote id="F3">1 for 1</footnote>
        <footnote id="F4">The Board approved performance results for the performance-adjusted cash based restricted stock unit grant (15PSUC20) and the performance-adjusted stock based restricted stock unit grant (15PSUS20) made in 2020 for the 2020-2022 performance cycle, and these awards will vest on March 1, 2023.</footnote>
        <footnote id="F5">This holding reflects phantom stock payable in cash upon retirement or other termination of employment under the FirstEnergy Corp. Amended and Restated Executive Deferred Compensation Plan. Each share of phantom stock is the economic equivalent of one share of common stock.</footnote>
        <footnote id="F6">Includes stock units acquired through dividend reinvestments.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Daniel M. Dunlap, attorney-in-fact</signatureName>
        <signatureDate>2023-02-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
