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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">As
filed with the Securities and Exchange Commission on May 30, 2008</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

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<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED
STATES SECURITIES AND EXCHANGE COMMISSION</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
DC 20549</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;S-8</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">American
DG Energy Inc.</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant as specified in its charter)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-3569304</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other jurisdiction of</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer</font></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">incorporation or organization)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Identification No.)</font></p>
  </td>
 </tr>
</table>

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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">45
First Avenue</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Waltham,
Massachusetts 02451</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal executive offices)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade color="black" align="center"></div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">American DG Energy Inc. 2005 Stock Incentive Plan</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Full title of the Plan)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade color="black" align="center"></div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Anthony
S. Loumidis</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Chief
Financial Officer</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">American
DG Energy Inc.</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">45
First Avenue</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Waltham,
Massachusetts 02451</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(781)
622-1117</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Name, address and telephone number of agent for service)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade color="black" align="center"></div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Copy to:</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Edwin
L. Miller Jr.</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sullivan&nbsp;&amp; Worcester LLP</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">One Post Office Square</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Boston, MA 02109</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Tel: (617) 338-2800</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Fax: (617) 338-2880</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade color="black" align="center"></div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;page-break-after:avoid;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Indicate by check mark whether the registrant is a
large accelerated filer, an accelerated filer, a non-accelerated filer, or a
smaller reporting company.&#160; See the
definitions of &#147;large accelerated filer&#148;, &#147;accelerated filer&#148; and &#147;smaller
reporting company&#148; in Rule&nbsp;12b-2 of the Exchange Act.&#160; (Check One):</font></p>

<p style="margin:0in 0in .0001pt;page-break-after:avoid;text-indent:20.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="93%" style="border-collapse:collapse;margin-left:35.1pt;width:93.5%;">
 <tr>
  <td width="54%" valign="top" style="padding:0in 0in 0in 0in;width:54.36%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Large accelerated filer
  </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
  <td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.64%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Accelerated filer </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
 </tr>
 <tr>
  <td width="54%" valign="top" style="padding:0in 0in 0in 0in;width:54.36%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Non &#150;accelerated filer </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
  <td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.64%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Smaller reporting
  company </font><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>
  </td>
 </tr>
 <tr>
  <td width="54%" valign="top" style="padding:0in 0in 0in 0in;width:54.36%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Do not check if a
  smaller reporting company)</font></p>
  </td>
  <td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.64%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CALCULATION
OF REGISTRATION FEE</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="1" cellspacing="0" cellpadding="0" width="100%" style="border:none;border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="19%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:19.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Title&nbsp;of&nbsp;Each&nbsp;Class&nbsp;of</font></b><b><font size="1" style="font-size:8.0pt;font-weight:bold;"><br>
  Securities&nbsp;to&nbsp;be<br>
  Registered</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="18%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:18.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount&nbsp;to&nbsp;be<br>
  Registered(1)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="18%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:18.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed&nbsp;Maximum<br>
  Offering&nbsp;Price&nbsp;Per<br>
  Share(2)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="18%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:18.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed&nbsp;Maximum<br>
  Aggregate&nbsp;Offering<br>
  Price(2)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="18%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:18.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount&nbsp;of<br>
  Registration<br>
  Fee(2)</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="19%" valign="top" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:19.0%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Common Stock</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:18.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1,000,000
  shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:1.12%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:16.88%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.62</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:1.12%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:16.88%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1,625,000</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:1.12%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:16.88%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">63.86</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 1.5pt;padding:0in 0in 0in 0in;width:1.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="142" style="border:none;"></td>
  <td width="15" style="border:none;"></td>
  <td width="135" style="border:none;"></td>
  <td width="15" style="border:none;"></td>
  <td width="8" style="border:none;"></td>
  <td width="126" style="border:none;"></td>
  <td width="15" style="border:none;"></td>
  <td width="8" style="border:none;"></td>
  <td width="126" style="border:none;"></td>
  <td width="15" style="border:none;"></td>
  <td width="8" style="border:none;"></td>
  <td width="126" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)&nbsp;In
accordance with Rule&nbsp;416 under the Securities Act of 1933, as amended,
this registration statement shall be deemed to cover any additional securities
that may from time to time be offered or issued to prevent dilution resulting
from stock splits, stock dividends or similar transactions.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)&nbsp;The
proposed maximum offering price per share and the proposed maximum aggregate
offering price have been estimated solely for the purpose of calculating the
amount of the registration fee in accordance with Rules&nbsp;457(c)&nbsp;and
457(h)&nbsp;under the Securities Act of 1933 on the basis of the average of the
high and low closing prices of the Common Stock of American DG Energy as quoted
on the Over-The-Counter Bulletin Board on May&nbsp;29, 2008.</font></p>

<div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">

<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">REGISTRATION OF ADDITIONAL SECURITIES</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXPLANATORY NOTE</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">American DG Energy Inc. (the &#147;Company&#148;)
is filing this registration statement to register an additional 1,000,000
shares of its common stock for issuance under the Company&#146;s 2005 Stock
Incentive Plan (the &#147;Plan&#148;). The increase in the number of shares authorized
for issuance under the Plan was approved by the Company&#146;s stockholders at its 2008
annual meeting held on May&nbsp;30, 2008. On October&nbsp;11, 2007, the Company
filed registration statement no. 333-146628 on Form&nbsp;S-8 (the &#147;Original
Registration Statement&#148;) covering 4,000,000 shares of the Company&#146;s common
stock authorized for issuance under the Plan and the American Distributed
Generation Inc. 2001 Stock Incentive Plan with the Securities and Exchange
Commission (the &#147;Commission&#148;), which was amended by a Post-Effective Amendment No.&nbsp;1
to the Original Registration Statement on March&nbsp;28, 2008 (the Original
Registration Statement, together with the Post-Effective Amendment No.&nbsp;1,
the &#147;Prior Registration Statement&#148;).&#160;
Pursuant to General Instruction E to Form&nbsp;S-8, the contents of the
Prior Registration Statement are incorporated herein by reference, except for
Item 3 and Item 8 of the Prior Registration Statement, which is being updated
by this registration statement.</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:24.5pt;"><font face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
prospectus meeting the requirements of Section&nbsp;10(a)&nbsp;of the
Securities Act of 1933, as amended, which is being provided to participants in
the Plan in conjunction with this registration statement also relates to the
shares registered under the Prior Registration Statement.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;text-transform:none;">PART&nbsp;I
- INFORMATION REQUIRED IN THE SECTION&nbsp;10(A)&nbsp;PROSPECTUS</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
document(s)&nbsp;containing the information specified in Part&nbsp;I of Form&nbsp;S-8
will be sent or given to participants as specified by Rule&nbsp;428(b)(1)&nbsp;of
the Securities Act of 1933, as amended.</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;text-transform:none;">PART&nbsp;II
- INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item 3. Incorporation of
Documents by Reference</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The following additional
documents, which have been filed by the registrant with the Commission under
the Securities Exchange Act of 1934 (the &#147;Exchange Act&#148;), are incorporated by
reference in and made a part of this registration statement, as of their respective
dates:</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The Company&#146;s Registration Statement on Form&nbsp;S-8, filed with the
Commission on October&nbsp;11, 2007, as amended by Post-Effective Amendment No.&nbsp;1
filed with the Commission on March&nbsp;28, 2008 (Commission No.&nbsp;333-1446628).</p>

<p align="left" style="margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The Company&#146;s Annual Report on Form&nbsp;10-K for the fiscal year ended
December&nbsp;31, 2007, filed with the Commission on March&nbsp;18, 2008
(Commission No.&nbsp;000-52294).</p>

<p align="left" style="margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The Company&#146;s Quarterly Report on Form&nbsp;10-Q for the period ended March&nbsp;31,
2008, filed with the Commission on May&nbsp;14, 2008 (Commission No.&nbsp;000-52294).</p>

<p align="left" style="margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The description of the registrant&#146;s common stock contained in the
registration statement on Form&nbsp;10-SB filed with the Commission on November&nbsp;2,
2006, as amended, and all further amendments or reports filed for the purpose
of updating such description (Commission No.&nbsp;000-52294).</p>

<p align="left" style="margin:0in 0in .0001pt 1.0in;text-align:left;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All documents subsequently
filed by the registrant pursuant to Sections 13(a), 13(c), 14 and 15(d)&nbsp;of
the Exchange Act prior to the filing of a post-effective amendment which
indicates that all securities offered have been sold or which deregisters all
securities then remaining unsold, shall be deemed to be incorporated by
reference in this registration statement and to be part hereof from the date of
filing of such documents.</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of this registration statement
to the extent that a statement herein, or in any subsequently filed document which
also is or is deemed to be incorporated by reference, modifies or supersedes
such statement. Any statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this registration
statement.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<div style="font-family:Times New Roman;">

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 8. Exhibits</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT INDEX</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="right">

<table border="0" cellspacing="0" cellpadding="0" width="94%" style="border-collapse:collapse;width:94.0%;">
 <tr>
  <td width="7%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:7.08%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit<br>
  No.</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="88%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:88.2%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1#</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">American
  DG Energy Inc. 2005 Stock Incentive Plan</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.1*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion
  of Sullivan&nbsp;&amp; Worcester LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent
  of Sullivan&nbsp;&amp; Worcester LLP<br>
  (contained in the opinion of Sullivan&nbsp;&amp; Worcester LLP filed herewith
  as Exhibit&nbsp;5.1)</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent
  of Vitale, Caturano&nbsp;&amp; Co., Ltd.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Powers
  of Attorney (included in the signature page&nbsp;to this registration statement)</font></p>
  </td>
 </tr>
</table>

</div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">#</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Incorporated hereby by reference to Exhibit&nbsp;A
to the Company&#146;s definitive proxy statement for the year ended December&nbsp;31,
2007 (Commission No.&nbsp;000-52294).</font></p>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Filed herewith</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
<!-- SEQ.=1,FOLIO='3',FILE='C:\JMS\rmoralec\08-15605-1\task2967909\15605-1-ba-01.htm',USER='rmoralec',CD='May 30 14:06 2008' -->


<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;text-transform:none;">SIGNATURES</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;text-transform:uppercase;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements
of the Securities Act, the registrant certifies that it has reasonable grounds
to believe that it meets all of the requirements for filing on Form&nbsp;S-8
and has duly caused this registration statement on Form&nbsp;S-8 to be signed
on its behalf by the undersigned, thereunto duly authorized, in Waltham,
Massachusetts, on May&nbsp;30, 2008.</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">AMERICAN DG ENERGY INC.</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="45%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:45.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  JOHN N. HATSOPOULOS</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">John
  N. Hatsopoulos</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief
  Executive Officer</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt 3.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">POWER OF ATTORNEY AND SIGNATURES</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The undersigned officers and directors of the company hereby constitute
and appoint John N. Hatsopoulos, Barry J. Sanders and Anthony S. Loumidis, and
each of them singly, with full power of substitution, our true and lawful
attorneys-in-fact and agents to take any actions to enable the company to
comply with the Securities Act, and any rules, regulations and requirements of
the Commission, in connection with this registration statement, including the
power and authority to sign for us in our names in the capacities indicated
below any and all amendments to this registration statement and any other
registration statement filed pursuant to the provisions of Rule&nbsp;462 under
the Securities Act.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p align="left" style="font-size:8.0pt;font-weight:bold;line-height:normal;margin:0in 0in .0001pt;text-align:left;"><!-- SET mrlNoTableShading -->Signature</p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p align="left" style="font-weight:bold;line-height:normal;margin:0in 0in .0001pt;text-align:left;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="42%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:42.4%;">
  <p style="font-weight:bold;line-height:normal;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Title</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p align="left" style="font-weight:bold;line-height:normal;margin:0in 0in .0001pt;text-align:left;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:14.68%;">
  <p style="font-weight:bold;line-height:normal;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Date</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ GEORGE N. HATSOPOULOS</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman of the Board</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">George N. Hatsopoulos</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ JOHN N. HATSOPOULOS</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Executive Officer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">John N. Hatsopoulos</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Principal Executive Officer)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ ANTHONY S. LOUMIDIS</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Financial Officer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Anthony S. Loumidis</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Principal Financial&nbsp;&amp; Accounting Officer)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ EARL R. LEWIS</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Earl R. Lewis</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ CHARLES T. MAXWELL</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Charles T. Maxwell</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ ALAN D. WEINSTEIN</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">May&nbsp;30, 2008</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Alan D. Weinstein</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p align="center" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">EXHIBIT INDEX</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="right">

<table border="0" cellspacing="0" cellpadding="0" width="94%" style="border-collapse:collapse;width:94.0%;">
 <tr>
  <td width="7%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:7.08%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit<br>
  No.</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="88%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:88.2%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1#</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">American
  DG Energy Inc. 2005 Stock Incentive Plan</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.1*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion
  of Sullivan&nbsp;&amp; Worcester LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent
  of Sullivan&nbsp;&amp; Worcester LLP<br>
  (contained in the opinion of Sullivan&nbsp;&amp; Worcester LLP filed herewith
  as Exhibit&nbsp;5.1)</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent
  of Vitale, Caturano&nbsp;&amp; Co., Ltd.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24*</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.08%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#150;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="88%" valign="top" style="padding:0in 0in 0in 0in;width:88.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Powers
  of Attorney (included in the signature page&nbsp;to this registration
  statement)</font></p>
  </td>
 </tr>
</table>

</div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">#</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Incorporated herein by reference to Exhibit&nbsp;A
to the Company&#146;s definitive proxy statement for the year ended December&nbsp;31,
2007 (Commission No.&nbsp;000-52294).</font></p>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Filed herewith.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>

<div style="margin:0in 0in .0001pt;text-indent:0in;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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[{"type": "S-8", "sequence": "1", "filename": "a08-15605_1s8.htm", "description": "S-8", "secsgml_size_bytes": 92089}]
{"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": "S-8", "act": "33", "file-number": "333-151287", "film-number": "08870202"}, "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"}}
As
filed with the Securities and Exchange Commission on May 30, 2008
UNITED
STATES SECURITIES AND EXCHANGE COMMISSION
Washington,
DC 20549
FORM S-8
REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933
American
DG Energy Inc.
(Exact name of registrant as specified in its charter)
Delaware
04-3569304
(State or other jurisdiction of
(I.R.S. Employer
incorporation or organization)
Identification No.)
45
First Avenue
Waltham,
Massachusetts 02451
(Address of principal executive offices)
American DG Energy Inc. 2005 Stock Incentive Plan
(Full title of the Plan)
Anthony
S. Loumidis
Chief
Financial Officer
American
DG Energy Inc.
45
First Avenue
Waltham,
Massachusetts 02451
(781)
622-1117
(Name, address and telephone number of agent for service)
Copy to:
Edwin
L. Miller Jr.
Sullivan & Worcester LLP
One Post Office Square
Boston, MA 02109
Tel: (617) 338-2800
Fax: (617) 338-2880
Indicate by check mark whether the registrant is a
large accelerated filer, an accelerated filer, a non-accelerated filer, or a
smaller reporting company.  See the
definitions of "large accelerated filer", "accelerated filer" and "smaller
reporting company" in Rule 12b-2 of the Exchange Act.  (Check One):
Large accelerated filer
o
Accelerated filer
o
Non –accelerated filer
o
Smaller reporting
  company
x
(Do not check if a
  smaller reporting company)
CALCULATION
OF REGISTRATION FEE
Title of Each Class of
Securities to be
Registered
Amount to be
Registered(1)
Proposed Maximum
Offering Price Per
Share(2)
Proposed Maximum
Aggregate Offering
Price(2)
Amount of
Registration
Fee(2)
Common Stock
1,000,000
  shares
$
1.62
$
1,625,000
$
63.86
(1) In
accordance with Rule 416 under the Securities Act of 1933, as amended,
this registration statement shall be deemed to cover any additional securities
that may from time to time be offered or issued to prevent dilution resulting
from stock splits, stock dividends or similar transactions.
(2) The
proposed maximum offering price per share and the proposed maximum aggregate
offering price have been estimated solely for the purpose of calculating the
amount of the registration fee in accordance with Rules 457(c) and
457(h) under the Securities Act of 1933 on the basis of the average of the
high and low closing prices of the Common Stock of American DG Energy as quoted
on the Over-The-Counter Bulletin Board on May 29, 2008.
REGISTRATION OF ADDITIONAL SECURITIES
EXPLANATORY NOTE
American DG Energy Inc. (the "Company")
is filing this registration statement to register an additional 1,000,000
shares of its common stock for issuance under the Company's 2005 Stock
Incentive Plan (the "Plan"). The increase in the number of shares authorized
for issuance under the Plan was approved by the Company's stockholders at its 2008
annual meeting held on May 30, 2008. On October 11, 2007, the Company
filed registration statement no. 333-146628 on Form S-8 (the "Original
Registration Statement") covering 4,000,000 shares of the Company's common
stock authorized for issuance under the Plan and the American Distributed
Generation Inc. 2001 Stock Incentive Plan with the Securities and Exchange
Commission (the "Commission"), which was amended by a Post-Effective Amendment No. 1
to the Original Registration Statement on March 28, 2008 (the Original
Registration Statement, together with the Post-Effective Amendment No. 1,
the "Prior Registration Statement"). 
Pursuant to General Instruction E to Form S-8, the contents of the
Prior Registration Statement are incorporated herein by reference, except for
Item 3 and Item 8 of the Prior Registration Statement, which is being updated
by this registration statement.
The
prospectus meeting the requirements of Section 10(a) of the
Securities Act of 1933, as amended, which is being provided to participants in
the Plan in conjunction with this registration statement also relates to the
shares registered under the Prior Registration Statement.
PART I
- INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS
The
document(s) containing the information specified in Part I of Form S-8
will be sent or given to participants as specified by Rule 428(b)(1) of
the Securities Act of 1933, as amended.
PART II
- INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of
Documents by Reference
The following additional
documents, which have been filed by the registrant with the Commission under
the Securities Exchange Act of 1934 (the "Exchange Act"), are incorporated by
reference in and made a part of this registration statement, as of their respective
dates:
(a)
The Company's Registration Statement on Form S-8, filed with the
Commission on October 11, 2007, as amended by Post-Effective Amendment No. 1
filed with the Commission on March 28, 2008 (Commission No. 333-1446628).
(b)
The Company's Annual Report on Form 10-K for the fiscal year ended
December 31, 2007, filed with the Commission on March 18, 2008
(Commission No. 000-52294).
(c)
The Company's Quarterly Report on Form 10-Q for the period ended March 31,
2008, filed with the Commission on May 14, 2008 (Commission No. 000-52294).
(d)
The description of the registrant's common stock contained in the
registration statement on Form 10-SB filed with the Commission on November 2,
2006, as amended, and all further amendments or reports filed for the purpose
of updating such description (Commission No. 000-52294).
All documents subsequently
filed by the registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of
the Exchange Act prior to the filing of a post-effective amendment which
indicates that all securities offered have been sold or which deregisters all
securities then remaining unsold, shall be deemed to be incorporated by
reference in this registration statement and to be part hereof from the date of
filing of such documents.
Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of this registration statement
to the extent that a statement herein, or in any subsequently filed document which
also is or is deemed to be incorporated by reference, modifies or supersedes
such statement. Any statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this registration
statement.
2
Item 8. Exhibits
EXHIBIT INDEX
Exhibit
No.
Description
4.1#
–
American
  DG Energy Inc. 2005 Stock Incentive Plan
5.1*
–
Opinion
  of Sullivan & Worcester LLP
23.1*
–
Consent
  of Sullivan & Worcester LLP
(contained in the opinion of Sullivan & Worcester LLP filed herewith
  as Exhibit 5.1)
23.2*
–
Consent
  of Vitale, Caturano & Co., Ltd.
24*
–
Powers
  of Attorney (included in the signature page to this registration statement)
#
Incorporated hereby by reference to Exhibit A
to the Company's definitive proxy statement for the year ended December 31,
2007 (Commission No. 000-52294).
*
Filed herewith
3
SIGNATURES
Pursuant to the requirements
of the Securities Act, the registrant certifies that it has reasonable grounds
to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this registration statement on Form S-8 to be signed
on its behalf by the undersigned, thereunto duly authorized, in Waltham,
Massachusetts, on May 30, 2008.
AMERICAN DG ENERGY INC.
By:
/s/
  JOHN N. HATSOPOULOS
John
  N. Hatsopoulos
Chief
  Executive Officer
POWER OF ATTORNEY AND SIGNATURES
The undersigned officers and directors of the company hereby constitute
and appoint John N. Hatsopoulos, Barry J. Sanders and Anthony S. Loumidis, and
each of them singly, with full power of substitution, our true and lawful
attorneys-in-fact and agents to take any actions to enable the company to
comply with the Securities Act, and any rules, regulations and requirements of
the Commission, in connection with this registration statement, including the
power and authority to sign for us in our names in the capacities indicated
below any and all amendments to this registration statement and any other
registration statement filed pursuant to the provisions of Rule 462 under
the Securities Act.
Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.
Signature
Title
Date
/s/ GEORGE N. HATSOPOULOS
Chairman of the Board
May 30, 2008
George N. Hatsopoulos
/s/ JOHN N. HATSOPOULOS
Chief Executive Officer
May 30, 2008
John N. Hatsopoulos
(Principal Executive Officer)
/s/ ANTHONY S. LOUMIDIS
Chief Financial Officer
May 30, 2008
Anthony S. Loumidis
(Principal Financial & Accounting Officer)
/s/ EARL R. LEWIS
Director
May 30, 2008
Earl R. Lewis
/s/ CHARLES T. MAXWELL
Director
May 30, 2008
Charles T. Maxwell
/s/ ALAN D. WEINSTEIN
Director
May 30, 2008
Alan D. Weinstein
4
EXHIBIT INDEX
Exhibit
No.
Description
4.1#
–
American
  DG Energy Inc. 2005 Stock Incentive Plan
5.1*
–
Opinion
  of Sullivan & Worcester LLP
23.1*
–
Consent
  of Sullivan & Worcester LLP
(contained in the opinion of Sullivan & Worcester LLP filed herewith
  as Exhibit 5.1)
23.2*
–
Consent
  of Vitale, Caturano & Co., Ltd.
24*
–
Powers
  of Attorney (included in the signature page to this registration
  statement)
#
Incorporated herein by reference to Exhibit A
to the Company's definitive proxy statement for the year ended December 31,
2007 (Commission No. 000-52294).
*
Filed herewith.
5