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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-10-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001041792</issuerCik>
        <issuerName>ENERGY CO OF PARANA</issuerName>
        <issuerTradingSymbol>ELPC</issuerTradingSymbol>
        <issuerForeignTradingSymbol>CPLE3</issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002121860</rptOwnerCik>
            <rptOwnerName>Sales Pedro Franco</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>JOSE IZIDORO BIAZETTO STREET</rptOwnerStreet1>
            <rptOwnerStreet2>N. 158, BLOCK A</rptOwnerStreet2>
            <rptOwnerCity>CURITIBA</rptOwnerCity>
            <rptOwnerNonUSStateTerritory>PR</rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>D5</rptOwnerCountry>
            <rptOwnerZipCode>81200-240</rptOwnerZipCode>
            <rptOwnerStateDescription>BRAZIL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2026-10-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.4768</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24844</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents a sale price of BRL17.58 per share, converted to U.S. dollars at the selling exchange rate as of October 19, 2026 of USD1.00 to BRL5.0564 reported by the Central Bank of Brazil.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Pedro Franco Sales</signatureName>
        <signatureDate>2026-10-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
