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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-04-16</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001439124</issuerCik>
        <issuerName>AXIA Energia S.A.</issuerName>
        <issuerTradingSymbol>AXIA3</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002131225</rptOwnerCik>
            <rptOwnerName>Tokoro Catia Yuassa</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>AVENIDA GRACA ARANHA, NO. 26</rptOwnerStreet1>
            <rptOwnerStreet2>CENTRO</rptOwnerStreet2>
            <rptOwnerCity>RIO DE JANEIRO</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>D5</rptOwnerCountry>
            <rptOwnerZipCode>20030-000</rptOwnerZipCode>
            <rptOwnerStateDescription>BRAZIL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle></officerTitle>
            <otherText>See Remarks*</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>*Member of the Fiscal Council (Alternate).

No securities are beneficially owned.</remarks>

    <ownerSignature>
        <signatureName>/s/ Catia Yuassa Tokoro</signatureName>
        <signatureDate>2026-04-24</signatureDate>
    </ownerSignature>
</ownershipDocument>