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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,
 SurKuZt+Oxd/jBUz2H9KAp1u09uMwj9SEKo8+aCpDVAS4G9hZD+1UMeSdHGG+43w
 MZzbvJ3Rd8hCA9NwMFESjw==

<SEC-DOCUMENT>0000107815-04-000030.txt : 20040107
<SEC-HEADER>0000107815-04-000030.hdr.sgml : 20040107
<ACCEPTANCE-DATETIME>20040107142510
ACCESSION NUMBER:		0000107815-04-000030
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040102
FILED AS OF DATE:		20040107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CORNOG ROBERT A
		CENTRAL INDEX KEY:			0001204351

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09057
		FILM NUMBER:		04512697

	MAIL ADDRESS:	
		STREET 1:		5757 N. GREEN BAY AVENUE
		STREET 2:		PO BOX 591
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53201-0591

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WISCONSIN ENERGY CORP
		CENTRAL INDEX KEY:			0000783325
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				391391525
		STATE OF INCORPORATION:			WI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		231 W MICHIGAN ST
		STREET 2:		P O BOX 2949
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53201
		BUSINESS PHONE:		4142212345

	MAIL ADDRESS:	
		STREET 1:		231 WEST MICHIGAN STREET
		STREET 2:		P O BOX 2949
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53201
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c0001204351d20040107f4f.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2004-01-02</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000783325</issuerCik><issuerName>WISCONSIN ENERGY CORP</issuerName>        <issuerTradingSymbol>WEC</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001204351</rptOwnerCik><rptOwnerName>CORNOG ROBERT A</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>231 WEST MICHIGAN STREET</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>MILWAUKEE</rptOwnerCity><rptOwnerState>WI</rptOwnerState><rptOwnerZipCode>53203</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeTabl
e><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2004-01-02</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>1945</value></transactionShares><transactionPricePerShare><value>0</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>9337</value><footnoteId id="F1"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHol
ding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>150</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>by Spouse</value></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable></derivativeTable><footnotes><footnote id="F1">Includes shares acquired pursuant to a dividend  reinvestment feature of WEC's Stock Plus Investment Plan in transactions exempt from Section 16 pursuant to Rule 16a-11.</footnote></footnotes><ownerSignature><signatureName>Kristine A. Rappe as Attorney-in-Fact</signatureName><signatureDate>2004-01-07</signatureDate></ownerSignature></ownershipDocument>

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</SEC-DOCUMENT>
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