<SEC-DOCUMENT>0001109357-18-000017.txt : 20180119
<SEC-HEADER>0001109357-18-000017.hdr.sgml : 20180119
<ACCEPTANCE-DATETIME>20180119171332
ACCESSION NUMBER:		0001109357-18-000017
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171231
FILED AS OF DATE:		20180119
DATE AS OF CHANGE:		20180119

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Crane Christopher M.
		CENTRAL INDEX KEY:			0001411453

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-16169
		FILM NUMBER:		18538103

	MAIL ADDRESS:	
		STREET 1:		10 SOUTH DEARBORN STREET
		STREET 2:		54TH FLOOR
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60603

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EXELON CORP
		CENTRAL INDEX KEY:			0001109357
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				232990190
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 805398
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60680-5398
		BUSINESS PHONE:		3123947399

	MAIL ADDRESS:	
		STREET 1:		PO BOX 805398
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60680-5398
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
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<DESCRIPTION>PRIMARY DOCUMENT
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        <issuerCik>0001109357</issuerCik>
        <issuerName>EXELON CORP</issuerName>
        <issuerTradingSymbol>EXC</issuerTradingSymbol>
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            <rptOwnerName>Crane Christopher M.</rptOwnerName>
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            <rptOwnerStreet1>10 SOUTH DEARBORN STREET</rptOwnerStreet1>
            <rptOwnerStreet2>54TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60603</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
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                    <value>Held by Trust for Benefit of daughter</value>
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            <securityTitle>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option 01/26/2009</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>56.51</value>
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            <exerciseDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>49000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>49000</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>NQ Stock Option 01/28/2008</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>73.29</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>28000</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>28000</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Restricted stock unit awards made pursuant to the Exelon Long Term Incentive Plan.  Share awards are made annually in January at the Compensation and Leadership Development committee's meeting and vest in 1/3 increments on the date of the committee's January meeting in the first, second and third years after the award was made.</footnote>
        <footnote id="F2">Balance consists of unvested shares remaining from the awards granted in January of the previous three years along with shares acquired through automatic dividend reinvestment as follows: 1,923, 1,906, 1,845 and 1,731 shares acquired on March 10, 2017, June 9, 2017, September 8, 2017 and December 9, 2017 respectively.</footnote>
        <footnote id="F3">Phantom share equivalents representing units held in the Exelon stock fund in a multi-fund, non-qualified deferred compensation plan.  The Exelon stock fund is a unitized fund that consists of Exelon common stock and short term investments.  Units of the fund will be settled upon the reporting person's separation from the board for any reason. Units will be settled in cash.  Units are acquired through regular periodic contributions, company matching contributions and the reinvestment of dividend equivalents.  The balance of phantom share equivalents may fluctuate from time to time due to fluctuations in the fund composition.</footnote>
        <footnote id="F4">Balance inlcudes 57, 61, 54 and 48 share equivalents accrued on February 13, 2017, May 11, 2017, August 11, 2017 and November 14, 2017 respectively thorugh automatic dividend reinvestment.</footnote>
        <footnote id="F5">Non qualified employee stock options, awarded pursuant to the Exelon Long Term Incentive Plan.  Options vest in 1/4 increments on each of the first four anniversaries of the grant date, referenced in column one, and expire on the tenth anniversay of the grant date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Scott N. Peters, Esq. Attorney in Fact for Christopher M. Crane</signatureName>
        <signatureDate>2018-01-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
