<SEC-DOCUMENT>0001144204-13-053421.txt : 20131001
<SEC-HEADER>0001144204-13-053421.hdr.sgml : 20131001
<ACCEPTANCE-DATETIME>20131001172314
ACCESSION NUMBER:		0001144204-13-053421
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20131001
FILED AS OF DATE:		20131001
DATE AS OF CHANGE:		20131001

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TECOGEN INC.
		CENTRAL INDEX KEY:			0001537435
		STANDARD INDUSTRIAL CLASSIFICATION:	AIR COND & WARM AIR HEATING EQUIP & COMM & INDL REFRIG EQUIP [3585]
		IRS NUMBER:				043536131
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		45 FIRST AVENUE
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		781-466-6400

	MAIL ADDRESS:	
		STREET 1:		45 FIRST AVENUE
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TECOGEN INC
		DATE OF NAME CHANGE:	20111215

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AOUN JOSEPH E
		CENTRAL INDEX KEY:			0001586833

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36103
		FILM NUMBER:		131127771

	MAIL ADDRESS:	
		STREET 1:		34 BEACON ST
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>v356106_3.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2013-10-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001537435</issuerCik>
        <issuerName>TECOGEN INC.</issuerName>
        <issuerTradingSymbol>TGEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001586833</rptOwnerCik>
            <rptOwnerName>AOUN JOSEPH E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>34 BEACON ST</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02108</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>/s/ Joseph E. Aoun</signatureName>
        <signatureDate>2013-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>v356106_ex24.htm
<DESCRIPTION>POA
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>LIMITED POWER OF ATTORNEY FOR SECTION
16 REPORTING OBLIGATIONS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Know all by these presents, that the undersigned
hereby constitutes and appoints each of Bonnie J. Brown or Robert A. Panora, or either of them acting singly and with full power
of substitution, the undersigned's true and lawful attorney-in-fact to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer or director or both of Tecogen, Inc. (the &quot;<FONT STYLE="color: black"><B>Company</B></FONT>&quot;),
Forms 3, 4 and 5 (and any amendments thereto) in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended
(the &quot;<FONT STYLE="color: black"><B>Exchange Act</B></FONT>&quot;), and the rules thereunder;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form 3, 4 or 5, complete and execute any amendments thereto,
and timely file such form with the U.S. Securities and Exchange Commission (the &quot;<FONT STYLE="color: black"><B>SEC</B></FONT>&quot;)
and any securities exchange or similar authority, including without limitation the filing of a Form ID or any other documents necessary
or appropriate to enable the undersigned to file the Forms 3, 4 and 5 electronically with the SEC; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">take any other action in connection with the foregoing which,
in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by or for, the undersigned,
it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Limited
Power of Attorney shall be in such form and shall contain such information and disclosure as such attorney-in-fact may approve
in such attorney-in-fact's discretion.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The undersigned hereby grants to each such
attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever required, necessary or proper
to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned
might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that
such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of
this Limited Power of Attorney and the rights and powers herein granted.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request and on the behalf of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with, or any liability for the failure to comply with, any
provision of Section 16 of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This Limited Power of Attorney shall remain
in full force and effect until the undersigned is no longer required to file Forms 3, 4 or 5 with respect to the undersigned's
holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing
delivered to each of the foregoing attorneys-in-fact.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">[SIGNATURE PAGE FOLLOWS]</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0; text-indent: 1in">IN WITNESS WHEREOF, the undersigned
has executed this Limited Power of Attorney as of this 24th day of September, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0; text-indent: 1in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 50%; padding-right: 22.95pt; padding-left: 5.4pt; font-size: 10pt"><FONT STYLE="font-size: 10pt; color: black">Signed and acknowledged:</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0">_<U>/s/ Joseph E. Aoun _</U>__________</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0">Joseph E. Aoun</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 22.95pt 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
