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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 5pt; text-align: center"><B>WASHINGTON, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-align: center"><B>FORM <FONT STYLE="color: black">8-K</FONT></B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>PURSUANT TO SECTION 13 OR 15(d) OF THE </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECURITIES EXCHANGE ACT OF 1934</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Date of report (Date of earliest event reported):
February 2, 2012</P>

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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>AMERICAN DG ENERGY INC.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Exact Name of Registrant as Specified in Its
Charter)</P>

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

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
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    <TD STYLE="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">001-34493</TD>
    <TD STYLE="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">04-3569304</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Commission File Number)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(IRS Employer Identification No.)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">45 First Avenue</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">Waltham, Massachusetts</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">02451</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Address of Principal Executive Offices)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Zip Code)</TD></TR>
</TABLE>


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<P STYLE="font: 10pt/1pt Times New Roman, Times, Serif; margin: 0 0 8pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(781) 622-1120</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Registrant&rsquo;s Telephone Number, Including
Area Code)<B>&nbsp;</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 6pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 7.1pt"><FONT STYLE="font-family: Wingdings 2; color: black">&pound;</FONT>Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6.95pt"><FONT STYLE="font-family: Wingdings 2; color: black">&pound;</FONT>Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6.95pt"><FONT STYLE="font-family: Wingdings 2; color: black">&pound;</FONT>Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Wingdings 2; color: black">&pound;</FONT>Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 3pt">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 3pt">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in"><B>Item 8.01.</B></TD><TD><B>Other Events.</B></TD></TR></TABLE>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">On February 2, 2012, American DG Energy Inc.,
or the Company, completed the repurchase of 500,000 shares of its Common Stock, $0.001 par value, at $1.50 per share, for a total
purchase price of $750,000, in a private transaction. The Company&rsquo;s Board of Directors authorized this transaction at a meeting
held on January 18, 2012.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

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

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

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        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;Date: February 2, 2012</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P></TD>
    <TD STYLE="width: 40%; padding-right: 0; padding-left: 0; border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">AMERICAN DG ENERGY INC.</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">By: /s/ Anthony S. Loumidis&nbsp;</P></TD>
    <TD STYLE="width: 10%">&nbsp;</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: 0; padding-left: 0; font-size: 10pt">Anthony S. Loumidis, Chief Financial Officer</TD>
    <TD>&nbsp;</TD></TR>
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{"company-data": {"conformed-name": "AMERICAN DG ENERGY INC", "cik": "0001378706", "assigned-sic": "4900", "irs-number": "043569304", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-34493", "film-number": "12566077"}, "business-address": {"street1": "45 FIRST AVENUE", "city": "WALTHAM", "state": "MA", "zip": "02451", "phone": "781-622-1120"}, "mail-address": {"street1": "45 FIRST AVENUE", "city": "WALTHAM", "state": "MA", "zip": "02451"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM
8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
Date of report (Date of earliest event reported):
February 2, 2012
AMERICAN DG ENERGY INC.
(Exact Name of Registrant as Specified in Its
Charter)
001-34493
04-3569304
(Commission File Number)
(IRS Employer Identification No.)
45 First Avenue
Waltham, Massachusetts
02451
(Address of Principal Executive Offices)
(Zip Code)
(781) 622-1120
(Registrant's Telephone Number, Including
Area Code)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
£
Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
£
Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
£
Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
£
Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01.
Other Events.
On February 2, 2012, American DG Energy Inc.,
or the Company, completed the repurchase of 500,000 shares of its Common Stock, $0.001 par value, at $1.50 per share, for a total
purchase price of $750,000, in a private transaction. The Company's Board of Directors authorized this transaction at a meeting
held on January 18, 2012.
SIGNATURES
Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: February 2, 2012
AMERICAN DG ENERGY INC.
By: /s/ Anthony S. Loumidis
Anthony S. Loumidis, Chief Financial Officer