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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,
 PEFwSbArrnUcSPi0zJPMcKSKS24AmZom3PAH+jDTi9ukzrgdC5UCgkU7va7Ri+pK
 mtEzN5mZGl9RnSs2arybEw==

<SEC-DOCUMENT>0001004440-03-000116.txt : 20030702
<SEC-HEADER>0001004440-03-000116.hdr.sgml : 20030702
<ACCEPTANCE-DATETIME>20030702121725
ACCESSION NUMBER:		0001004440-03-000116
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030630
FILED AS OF DATE:		20030702

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CONSTELLATION ENERGY GROUP INC
		CENTRAL INDEX KEY:			0001004440
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				521964611
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		750 E PRATT ST
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
		BUSINESS PHONE:		4107832800

	MAIL ADDRESS:	
		STREET 1:		750 E PRATT STREET
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CONSTELLATION ENERGY CORP
		DATE OF NAME CHANGE:	19951220

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RH ACQUISITION CORP
		DATE OF NAME CHANGE:	19951205

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SULLIVAN MICHAEL D
		CENTRAL INDEX KEY:			0001050742

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-25931
		FILM NUMBER:		03770499

	BUSINESS ADDRESS:	
		STREET 1:		C/O BALTIMORE GAS AND ELECTRIC COMPANY
		STREET 2:		P.O. BOX 1475
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21203
		BUSINESS PHONE:		4102345575

	MAIL ADDRESS:	
		STREET 1:		C/O BALTIMORE GAS AND ELECTRIC COMPANY
		STREET 2:		P.O. BOX 1475
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21203
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c0001050742d20030701f4f.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-06-30</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001004440</issuerCik><issuerName>CONSTELLATION ENERGY GROUP INC</issuerName>        <issuerTradingSymbol>CEG</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001050742</rptOwnerCik><rptOwnerName>SULLIVAN MICHAEL D</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transac
tionDate><value>2003-06-30</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1"/></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>1020</value></transactionShares><transactionValue><value>0</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>8701.29</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value><footnoteId id="F2"/></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Reflects award of restricted stock.</footnote><footnote id="F2">Includes shares acquired through reinvested dividends un
der the Constellation Energy Group, Inc. Shareholder Investment Plan.</footnote></footnotes><ownerSignature><signatureName>Michael D. Sullivan</signatureName><signatureDate>2003-07-01</signatureDate></ownerSignature></ownershipDocument>

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