<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ce88d-13f9-77bb-90ed-2b6bee919e49,g:8849a117-27ad-472e-8fdd-e398effdcd90-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.tecogen.com/role/Cover" xlink:type="simple" xlink:href="tgen-20260512.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.tecogen.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ce88d-13f9-7820-9d93-09ae3716ddd9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_DocumentType_019ce88d-13f9-7820-9d93-09ae3716ddd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ce88d-13f9-7cef-a267-0ad11ef65e78" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_DocumentPeriodEndDate_019ce88d-13f9-7cef-a267-0ad11ef65e78" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ce88d-13f9-7f20-b6d8-8a390de49da4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityRegistrantName_019ce88d-13f9-7f20-b6d8-8a390de49da4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ce88d-13f9-727c-86b7-608bc6a3887e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ce88d-13f9-727c-86b7-608bc6a3887e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ce88d-13f9-7581-879c-55c29738069d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityFileNumber_019ce88d-13f9-7581-879c-55c29738069d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ce88d-13f9-718b-8292-67887225fb0f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ce88d-13f9-718b-8292-67887225fb0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ce88d-13f9-71f4-b3f3-c308e3776f4c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityAddressAddressLine1_019ce88d-13f9-71f4-b3f3-c308e3776f4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ce88d-13f9-7dbb-9e93-78b0ebfe6bc6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityAddressStateOrProvince_019ce88d-13f9-7dbb-9e93-78b0ebfe6bc6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ce88d-13f9-7127-944d-a2327cb23d27" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityAddressCityOrTown_019ce88d-13f9-7127-944d-a2327cb23d27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ce88d-13f9-7dea-889c-c99c5d2bb3ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityAddressPostalZipCode_019ce88d-13f9-7dea-889c-c99c5d2bb3ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ce88d-13f9-75b3-9bb7-f8dce766bfbb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_CityAreaCode_019ce88d-13f9-75b3-9bb7-f8dce766bfbb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ce88d-13f9-74fd-95d8-c92c606bbf28" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_LocalPhoneNumber_019ce88d-13f9-74fd-95d8-c92c606bbf28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019ce88d-13f9-70cb-8b46-9d5c403a2d39" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_WrittenCommunications_019ce88d-13f9-70cb-8b46-9d5c403a2d39" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019ce88d-13f9-79d9-a58d-b3b57ac7464f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_SolicitingMaterial_019ce88d-13f9-79d9-a58d-b3b57ac7464f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019ce88d-13f9-70e7-a21f-e0a3510c12a9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_PreCommencementTenderOffer_019ce88d-13f9-70e7-a21f-e0a3510c12a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019ce88d-13f9-7073-8283-1d727f87effc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019ce88d-13f9-7073-8283-1d727f87effc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ce88d-13f9-7231-b059-5d68f31efe6e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ce88d-13f9-7231-b059-5d68f31efe6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ce88d-13f9-7150-8b1b-e023427000bc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_AmendmentFlag_019ce88d-13f9-7150-8b1b-e023427000bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ce88d-13f9-746e-aa20-7c4579f0002d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019ce88d-13f9-7425-84ea-1737ddd1432d" xlink:to="loc_dei_EntityCentralIndexKey_019ce88d-13f9-746e-aa20-7c4579f0002d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
