<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001633651</issuerCik>
        <issuerName>Tallgrass Energy, LP</issuerName>
        <issuerTradingSymbol>TGE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001186173</rptOwnerCik>
            <rptOwnerName>RAYMOND JOHN T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 W. 115TH STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LEAWOOD</rptOwnerCity>
            <rptOwnerState>KS</rptOwnerState>
            <rptOwnerZipCode>66211</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>200000</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>435000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class B Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>46386232</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Units of Tallgrass Equity, LLC</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>46386232</value>
                    <footnoteId id="F5"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>46386232</value>
                    <footnoteId id="F6"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Reporting Person acquired beneficial ownership of 200,000 Class A Shares of the Issuer (&quot;Class A Shares&quot;) as consideration in the merger (the &quot;Merger&quot;) of Razor Merger Sub, LLC, a Delaware limited liability company (&quot;Merger Sub&quot;), with and into Tallgrass Energy Partners, LP, a Delaware limited partnership (&quot;TEP&quot;), with TEP surviving the merger as a wholly-owned subsidiary of Tallgrass Equity, LLC (&quot;Tallgrass Equity&quot;) and its subsidiaries, which was effected pursuant to the Agreement and Plan of Merger, dated as of March 26, 2018, by and among the Issuer, Tallgrass Equity, TEP, Merger Sub and Tallgrass MLP GP, LLC, a Delaware limited liability company.</footnote>
        <footnote id="F2">(Continued from Footnote 1) The Merger closed on June 29, 2018, with a delayed effective date and time of June 30, 2018 at 11:59 p.m. Central Daylight Time (the &quot;Effective Time&quot;). At the Effective Time, each common unit representing a limited partner interest in TEP held by the Reporting Person immediately prior to the Merger converted into the right to receive 2.0 Class A Shares.</footnote>
        <footnote id="F3">As of the date of this Form 4, the Reporting Person holds an indirect ownership interest in the Issuer through his ownership in Tallgrass Holdings, LLC, a private Delaware limited liability company (&quot;Tallgrass Holdings&quot;). Further, the Reporting Person is the sole member of the general partner of the manager of Tallgrass Holdings, and therefore, he may be deemed to be the beneficial owner of all of the Class B Shares of the Issuer (&quot;Class B Shares&quot;) and Units representing limited liability company interests (&quot;Units&quot;) in Tallgrass Equity reported herein.</footnote>
        <footnote id="F4">(Continued from Footnote 3) Neither the filing of this Form 4 nor any of its contents shall be deemed to constitute an admission by the Reporting Person that he is the beneficial owner of any of the Class B Shares and Units reported herein for the purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed except to the extent of the Reporting Person's pecuniary interest therein.</footnote>
        <footnote id="F5">Pursuant to the Second Amended and Restated Agreement of Limited Partnership of the Issuer dated July 1, 2018 and the Second Amended and Restated Limited Liability Company Agreement of Tallgrass Equity dated May 12, 2015, Tallgrass Holdings has the right from time to time, at Tallgrass Holdings' sole election, to immediately exchange its Class B Shares and a corresponding number of Units for a like number of Class A Shares, subject to certain thresholds regarding the number of Class B Shares and Units to be exchanged. As a result, all Class B Shares and Units owned by Tallgrass Holdings, whether or not exchanged as of the date hereof, may be deemed to constitute Class A Shares indirectly beneficially owned by the Reporting Person (see footnotes (3) and (4)) because Tallgrass Holdings may acquire Class A Shares in exchange for such Class B Shares and Units within 60 days at Tallgrass Holdings' sole election.</footnote>
        <footnote id="F6">The Class B Shares and Units constitute derivative securities as described herein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher R. Jones, Attorney-in-Fact</signatureName>
        <signatureDate>2018-07-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
