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<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 1pt; margin-bottom: 1pt"><DIV STYLE="font-size: 1pt; border-top: Black 3.5pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

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

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

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

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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 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: 0pt 0; text-align: center"><B>SECURITIES EXCHANGE ACT OF 1934</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-align: center">Date of report (Date of earliest event reported):
August 10, 2012 (August 7, 2012)</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(State or Other Jurisdiction of Incorporation)</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"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <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">&nbsp;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">&nbsp;(Address of Principal Executive Offices)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Zip Code)</TD></TR>
</TABLE>
<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-align: center">(781) 622-1120</P>

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

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

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 1.01&#9;Entry into a Material Definitive Agreement.</B></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"><B>Item 3.02 &#9;Unregistered Sales of Equity Securities.</B></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"><FONT STYLE="color: black">On August 7,
2012, American DG Energy Inc., or the Company, entered into a subscription agreement with Frost Gamma Investments Trust, or the
Investor, an existing shareholder of the Company, for the sale of </FONT>1,250,000 shares of the Company&rsquo;s Common Stock,
$.001 par value per share, or the Securities, at a purchase price of $1.60 per share or an aggregate purchase price of $2,000,000.
The proceeds of this private placement will be used to fund additional installations of the Company&rsquo;s On-Site Utility energy
systems and for general corporate and working capital purposes<FONT STYLE="color: black">.</FONT></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 Securities were offered and sold to
the Investor in a private placement transaction made in reliance upon exemptions from registration pursuant to Section 4(a)(2)
under the Securities Act of 1933, as amended, or the Securities Act, and Rule 506 promulgated thereunder. The Investor is an accredited
investor as defined in Rule 501 of Regulation D promulgated under the Securities Act.</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 summary of the transaction set forth
above does not purport to be complete. This summary is qualified in its entirety by reference to the full text of the Subscription
Agreement attached as Exhibit 10.1.</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">This Current Report on Form 8-K contains
&ldquo;forward-looking statements&rdquo; within the meaning of Section 27A of the Securities Act, Section 21E of the Securities
Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995 and other federal securities laws.&nbsp;Such forward-looking
statements involve substantial risks and uncertainties. All statements, other than statements of historical fact, included in this
filing are forward-looking statements. Forward-looking statements include, among other things, our expected use of the proceeds
of the private placement. We have based these forward-looking statements on our current expectations and projections about future
events.&nbsp;Although we believe that the expectations underlying our forward-looking statements are reasonable, these expectations
may prove to be incorrect, and all of these statements are subject to risks and uncertainties. Therefore, you should not place
undue reliance on our forward-looking statements. We do not assume any obligation to update any forward-looking statements, whether
as a result of new information, future events or otherwise, except as required by law.</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"><B>Item 9.01. Financial Statements and Exhibits.</B></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"></P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 6%">(d)</TD>
    <TD STYLE="width: 12%; font-style: italic">Exhibits</TD>
    <TD STYLE="width: 82%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Exhibit 10.1 &ndash;</TD>
    <TD>Subscription Agreement,<FONT STYLE="color: black"><I> dated as of August 7, 2012, by and between the Company and Frost Gamma Investments Trust.</I></FONT></TD></TR>
</TABLE>


<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"><B>&nbsp;</B></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
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    <TD STYLE="width: 42%; padding-right: 5.4pt; padding-left: 5.4pt">
        <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">Date: August 10, 2012</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD>
    <TD STYLE="width: 58%; padding-right: 5.4pt; padding-left: 5.4pt">
        <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">AMERICAN DG ENERGY INC.</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">By: /s/ Anthony S. Loumidis</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">_____________________________________</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Anthony S. Loumidis, Chief Financial Officer</P></TD></TR>
</TABLE><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
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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": "121024943"}, "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):
August 10, 2012 (August 7, 2012)
AMERICAN DG ENERGY INC.
(Exact Name of Registrant as Specified in
Its Charter)
Delaware
(State or Other Jurisdiction of Incorporation)
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 1.01	Entry into a Material Definitive Agreement.
Item 3.02 	Unregistered Sales of Equity Securities.
On August 7,
2012, American DG Energy Inc., or the Company, entered into a subscription agreement with Frost Gamma Investments Trust, or the
Investor, an existing shareholder of the Company, for the sale of
1,250,000 shares of the Company's Common Stock,
$.001 par value per share, or the Securities, at a purchase price of $1.60 per share or an aggregate purchase price of $2,000,000.
The proceeds of this private placement will be used to fund additional installations of the Company's On-Site Utility energy
systems and for general corporate and working capital purposes
.
The Securities were offered and sold to
the Investor in a private placement transaction made in reliance upon exemptions from registration pursuant to Section 4(a)(2)
under the Securities Act of 1933, as amended, or the Securities Act, and Rule 506 promulgated thereunder. The Investor is an accredited
investor as defined in Rule 501 of Regulation D promulgated under the Securities Act.
The summary of the transaction set forth
above does not purport to be complete. This summary is qualified in its entirety by reference to the full text of the Subscription
Agreement attached as Exhibit 10.1.
This Current Report on Form 8-K contains
"forward-looking statements" within the meaning of Section 27A of the Securities Act, Section 21E of the Securities
Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995 and other federal securities laws. Such forward-looking
statements involve substantial risks and uncertainties. All statements, other than statements of historical fact, included in this
filing are forward-looking statements. Forward-looking statements include, among other things, our expected use of the proceeds
of the private placement. We have based these forward-looking statements on our current expectations and projections about future
events. Although we believe that the expectations underlying our forward-looking statements are reasonable, these expectations
may prove to be incorrect, and all of these statements are subject to risks and uncertainties. Therefore, you should not place
undue reliance on our forward-looking statements. We do not assume any obligation to update any forward-looking statements, whether
as a result of new information, future events or otherwise, except as required by law.
Item 9.01. Financial Statements and Exhibits.
(d)
Exhibits
Exhibit 10.1 –
Subscription Agreement,
dated as of August 7, 2012, by and between the Company and Frost Gamma Investments Trust.
2
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: August 10, 2012
AMERICAN DG ENERGY INC.
By: /s/ Anthony S. Loumidis
_____________________________________
Anthony S. Loumidis, Chief Financial Officer
3