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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ff26f-851e-75ee-a373-1815d610126d,g:94eff90c-5330-41a8-8036-c2f90edea101-->
<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-20260812.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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ff26f-851e-727f-ada9-c61142220916" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_DocumentType_019ff26f-851e-727f-ada9-c61142220916" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ff26f-851e-7025-b215-5198d239d863" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_DocumentPeriodEndDate_019ff26f-851e-7025-b215-5198d239d863" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ff26f-851e-7d06-8480-ad5954053c61" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityRegistrantName_019ff26f-851e-7d06-8480-ad5954053c61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ff26f-851e-72ed-af05-8a97cbf29966" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ff26f-851e-72ed-af05-8a97cbf29966" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ff26f-851e-75ca-a4cb-19ce6a784556" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityFileNumber_019ff26f-851e-75ca-a4cb-19ce6a784556" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ff26f-851e-7d9f-850f-25db6aa01cca" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ff26f-851e-7d9f-850f-25db6aa01cca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ff26f-851e-7710-b34c-39560ab3d48c" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityAddressAddressLine1_019ff26f-851e-7710-b34c-39560ab3d48c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ff26f-851e-73fb-9626-9e383956e7cf" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityAddressStateOrProvince_019ff26f-851e-73fb-9626-9e383956e7cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ff26f-851e-7eee-8029-5350cd4968df" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityAddressCityOrTown_019ff26f-851e-7eee-8029-5350cd4968df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ff26f-851e-7ef2-a0c8-3dfedc0f4e41" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityAddressPostalZipCode_019ff26f-851e-7ef2-a0c8-3dfedc0f4e41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ff26f-851e-7576-8c19-20b5c1717567" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_CityAreaCode_019ff26f-851e-7576-8c19-20b5c1717567" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ff26f-851e-703c-8c77-c79887151fd3" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_LocalPhoneNumber_019ff26f-851e-703c-8c77-c79887151fd3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019ff26f-851e-7c57-88ff-38d0c4baac50" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_WrittenCommunications_019ff26f-851e-7c57-88ff-38d0c4baac50" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019ff26f-851e-7562-abd9-be8dc5446875" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_SolicitingMaterial_019ff26f-851e-7562-abd9-be8dc5446875" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019ff26f-851e-751b-a097-0a6def435167" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_PreCommencementTenderOffer_019ff26f-851e-751b-a097-0a6def435167" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019ff26f-851e-745d-b686-078da3307848" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019ff26f-851e-745d-b686-078da3307848" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ff26f-851e-73ea-b236-e955bdb97b4f" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ff26f-851e-73ea-b236-e955bdb97b4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ff26f-851e-7ffb-b8ac-8ca6337577f3" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_AmendmentFlag_019ff26f-851e-7ffb-b8ac-8ca6337577f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ff26f-851e-7d28-a5bd-66a9da9f8344" 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_019ff26f-851e-7aef-98d2-0e2e5f1d832c" xlink:to="loc_dei_EntityCentralIndexKey_019ff26f-851e-7d28-a5bd-66a9da9f8344" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
