-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, CrMQvQ9jmWJ7i9MzItmV8sN+mElPgdQjvb3cGV6555lJEUCamf6VdjCT4LBtWkSk XY1b+kK6q4n+l8ZgjwdfxA== <SEC-DOCUMENT>0001140361-08-019636.txt : 20080818 <SEC-HEADER>0001140361-08-019636.hdr.sgml : 20080818 <ACCEPTANCE-DATETIME>20080818100519 ACCESSION NUMBER: 0001140361-08-019636 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20080814 FILED AS OF DATE: 20080818 DATE AS OF CHANGE: 20080818 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: TORTOISE ENERGY INFRASTRUCTURE CORP CENTRAL INDEX KEY: 0001268533 IRS NUMBER: 000000000 STATE OF INCORPORATION: MD BUSINESS ADDRESS: STREET 1: 11550 ASH STREET, SUITE 300 CITY: LEAWOOD STATE: KS ZIP: 66211 BUSINESS PHONE: 913-981-1020 MAIL ADDRESS: STREET 1: 11550 ASH STREET, SUITE 300 CITY: LEAWOOD STATE: KS ZIP: 66211 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: CICCOTELLO CONRAD S CENTRAL INDEX KEY: 0001280968 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 811-21462 FILM NUMBER: 081024169 MAIL ADDRESS: STREET 1: 10801 MASTIN BLVD CITY: OVERLAND PARK STATE: MO ZIP: 66210 </SEC-HEADER> <DOCUMENT> <TYPE>4 <SEQUENCE>1 <FILENAME>doc1.xml <DESCRIPTION>FORM 4 <TEXT> <XML> <?xml version="1.0"?> <ownershipDocument> <schemaVersion>X0303</schemaVersion> <documentType>4</documentType> <periodOfReport>2008-08-14</periodOfReport> <notSubjectToSection16>0</notSubjectToSection16> <issuer> <issuerCik>0001268533</issuerCik> <issuerName>TORTOISE ENERGY INFRASTRUCTURE CORP</issuerName> <issuerTradingSymbol>TYG</issuerTradingSymbol> </issuer> <reportingOwner> <reportingOwnerId> <rptOwnerCik>0001280968</rptOwnerCik> <rptOwnerName>CICCOTELLO CONRAD S</rptOwnerName> </reportingOwnerId> <reportingOwnerAddress> <rptOwnerStreet1>11550 ASH STREET</rptOwnerStreet1> <rptOwnerStreet2>SUITE 300</rptOwnerStreet2> <rptOwnerCity>LEAWOOD</rptOwnerCity> <rptOwnerState>KS</rptOwnerState> <rptOwnerZipCode>66211</rptOwnerZipCode> <rptOwnerStateDescription></rptOwnerStateDescription> </reportingOwnerAddress> <reportingOwnerRelationship> <isDirector>1</isDirector> <isOfficer>0</isOfficer> <isTenPercentOwner>0</isTenPercentOwner> <isOther>0</isOther> <officerTitle></officerTitle> <otherText></otherText> </reportingOwnerRelationship> </reportingOwner> <nonDerivativeTable> <nonDerivativeTransaction> <securityTitle> <value>Common Shares</value> </securityTitle> <transactionDate> <value>2008-08-14</value> </transactionDate> <deemedExecutionDate></deemedExecutionDate> <transactionCoding> <transactionFormType>4</transactionFormType> <transactionCode>P</transactionCode> <equitySwapInvolved>0</equitySwapInvolved> </transactionCoding> <transactionTimeliness> <value></value> </transactionTimeliness> <transactionAmounts> <transactionShares> <value>200</value> </transactionShares> <transactionPricePerShare> <value>29.46</value> </transactionPricePerShare> <transactionAcquiredDisposedCode> <value>A</value> </transactionAcquiredDisposedCode> </transactionAmounts> <postTransactionAmounts> <sharesOwnedFollowingTransaction> <value>2652.52</value> <footnoteId id="F1"/> </sharesOwnedFollowingTransaction> </postTransactionAmounts> <ownershipNature> <directOrIndirectOwnership> <value>D</value> </directOrIndirectOwnership> </ownershipNature> </nonDerivativeTransaction> </nonDerivativeTable> <derivativeTable></derivativeTable> <footnotes> <footnote id="F1">Includes 124.97 shares acquired under the Tortoise Energy Infrastructure Corporation dividend reinvestment plan.</footnote> </footnotes> <remarks></remarks> <ownerSignature> <signatureName>Terry Matlack, Attorney-in-Fact for Reporting Person</signatureName> <signatureDate>2008-08-15</signatureDate> </ownerSignature> </ownershipDocument> </XML> </TEXT> </DOCUMENT> </SEC-DOCUMENT> -----END PRIVACY-ENHANCED MESSAGE-----