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<DIV align="center" style="font-size: 10pt; margin-top: 18pt">As
filed with the Securities and Exchange Commission on August 27, 2010
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 6pt">Registration No.&nbsp;333-
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt; margin-top: 3pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>Ameresco, Inc.</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact Name of Registrant as Specified in Its Charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>04-3512838</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or Other Jurisdiction of Incorporation <BR>
or Organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer<BR>
Identification No.)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>111 Speen Street, Suite&nbsp;410<BR>
Framingham, Massachusetts</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" rowspan="2" valign="bottom"><B>01701</B><BR>
(Zip Code)</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(Address of Principal Executive Offices)
</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>2000 Stock Incentive Plan<BR>
</B><BR>
(Full Title of the Plan)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>George P. Sakellaris<BR>
President and Chief Executive Officer<BR>
111 Speen Street, Suite&nbsp;410<BR>
Framingham, Massachusetts 01701</B><BR>
(Name and Address of Agent For Service)<BR>
<B>(508)&nbsp;661-2200</B><BR>
(Telephone Number, Including Area Code, of Agent For Service)</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">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 &#147;large accelerated
filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule&nbsp;12b2 of the Exchange Act.
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Large accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Non-accelerated filer <FONT style="font-family: Wingdings">&#254;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Smaller reporting company <FONT style="font-family: Wingdings">&#111;</FONT></FONT></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">(Do not check if a smaller reporting company)</FONT></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>CALCULATION OF REGISTRATION FEE</B></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="24%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="25%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="9%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Proposed Maximum</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Proposed Maximum</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">Title of Securities</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount to be</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Offering Price Per</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Aggregate Offering</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount of</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">to be Registered</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Registered(1)</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Share</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Price</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Registration Fee</TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
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<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Class&nbsp;A Common
Stock, $0.0001 par
value per share</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">8,581,094  shares(2)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>

<TD align="center" valign="bottom" style="border-top: 2px solid #000000">$10.91(3)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>

<TD align="center" valign="bottom" style="border-top: 2px solid #000000">$93,619,736(3)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>

<TD align="center" valign="bottom" style="border-top: 2px solid #000000">$6,676</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 0px solid #000000; margin-top: 3pt">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>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.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Consists of 8,581,094 shares issuable under the 2000 Stock
Incentive Plan.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(3)</TD>
    <TD>&nbsp;</TD>
    <TD>Estimated solely for the purpose of calculating the registration fee pursuant to Rules 457(c)
and 457(h) of the Securities Act of 1933, as amended, and based upon the average of the high
and low prices of the Registrant&#146;s Class&nbsp;A Common Stock as reported on the New York Stock
Exchange on August 20, 2010.</TD>
</TR>

</TABLE>



<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>







<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">










<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I<BR>
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;1. Plan Information.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The information required by Item&nbsp;1 is included in documents sent or given to participants in
the plans covered by this registration statement pursuant to Rule&nbsp;428(b)(1) of the Securities Act
of 1933, as amended (the &#147;Securities Act&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;2. Registrant Information and Employee Plan Annual Information.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The written statement required by Item&nbsp;2 is included in documents sent or given to
participants in the plans covered by this registration statement pursuant to Rule&nbsp;428(b)(1) of the
Securities Act.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II<BR>
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant is subject to the informational and reporting requirements of Sections&nbsp;13(a),
14, and 15(d) of the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), and in
accordance therewith files reports, proxy statements and other information with the Securities and
Exchange Commission (the &#147;Commission&#148;). The following documents, which are on file with the
Commission, are incorporated in this registration statement by reference:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The registrant&#146;s latest annual report filed pursuant to Section 13(a) or 15(d) of the
Exchange Act or the latest prospectus filed pursuant to Rule 424(b) under the Securities Act that
contains audited financial statements for the registrant&#146;s latest fiscal year for which such
statements have been filed.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;All other reports filed pursuant to Section 13(a) or 15(d) of the Exchange Act since the
end of the fiscal year covered by the document referred to in (a)&nbsp;above.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;The description of the securities contained in the registrant&#146;s registration statement on
Form 8-A filed under the Exchange Act, including any amendment or report filed for the purpose of
updating such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents subsequently filed by the registrant pursuant to Sections&nbsp;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 hereby 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 the 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 the purposes of this registration statement to the extent that a statement contained
herein or in any other subsequently filed document which also is or is deemed to be incorporated by
reference herein 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.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;4. Description of Securities.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

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</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;102 of the General Corporation Law of the State of Delaware permits a corporation to
eliminate the personal liability of directors of a corporation to the corporation or its
stockholders for monetary damages for a breach of fiduciary duty as a director, except where the
director breached his duty of loyalty, failed to act in good faith, engaged in intentional
misconduct or knowingly violated a law, authorized the payment of a dividend or approved a stock
repurchase in violation of Delaware corporate law or obtained an improper personal benefit. The
registrant&#146;s restated certificate of incorporation provides that no director shall be personally
liable to it or its stockholders for monetary damages for any breach of fiduciary duty as director,
notwithstanding any provision of law imposing such liability, except to the extent that the
Delaware General Corporation Law prohibits the elimination or limitation of liability of directors
for breaches of fiduciary duty.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law provides that a corporation has the power
to indemnify a director, officer, employee, or agent of the corporation and certain other persons
serving at the request of the corporation in related capacities against expenses (including
attorneys&#146; fees), judgments, fines and amounts paid in settlements actually and reasonably incurred
by the person in connection with an action, suit or proceeding to which he is or is threatened to
be made a party by reason of such position, if such person acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the corporation and, in any
criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful, except
that, in the case of actions brought by or in the right of the corporation, no indemnification
shall be made with respect to any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that the Court of Chancery
or other adjudicating court determines that, despite the adjudication of liability but in view of
all of the circumstances of the case, such person is fairly and reasonably entitled to indemnity
for such expenses which the Court of Chancery or such other court shall deem proper.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#146;s restated certificate of incorporation provides that it will indemnify each
person who was or is a party or threatened to be made a party to any threatened, pending or
completed action, suit or proceeding (other than an action by or in the right of the registrant) by
reason of the fact that he or she is or was, or has agreed to become, a director or officer of the
registrant, or is or was serving, or has agreed to serve, at the registrant&#146;s request as a
director, officer, partner, employee or trustee of, or in a similar capacity with, another
corporation, partnership, joint venture, trust or other enterprise (all such persons being referred
to as an Indemnitee), or by reason of any action alleged to have been taken or omitted in such
capacity, against all expenses (including attorneys&#146; fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred in connection with such action, suit or proceeding and
any appeal therefrom, if such Indemnitee acted in good faith and in a manner he or she reasonably
believed to be in, or not opposed to, our best interests, and, with respect to any criminal action
or proceeding, he or she had no reasonable cause to believe his or her conduct was unlawful. The
registrant&#146;s restated certificate of incorporation provides that it will indemnify any Indemnitee
who was or is a party to an action or suit by or in the right of the registrant to procure a
judgment in the registrant&#146;s favor by reason of the fact that the Indemnitee is or was, or has
agreed to become, a director or officer of the registrant, or is or was serving, or has agreed to
serve, at the registrant&#146;s request as a director, officer, partner, employee or trustee or, or in a
similar capacity with, another corporation, partnership, joint venture, trust or other enterprise,
or by reason of any action alleged to have been taken or omitted in such capacity, against all
expenses (including attorneys&#146; fees) and, to the extent permitted by law, amounts paid in
settlement actually and reasonably incurred in connection with such action, suit or proceeding, and
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->- 2 -<!-- /Folio -->
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<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">any appeal therefrom, if the Indemnitee acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the registrant, except that
no indemnification shall be made with respect to any claim, issue or matter as to which such person
shall have been adjudged to be liable to the registrant, unless a court determines that, despite
such adjudication but in view of all of the circumstances, he or she is entitled to indemnification
of such expenses. Notwithstanding the foregoing, to the extent that any Indemnitee has been
successful, on the merits or otherwise, he or she will be indemnified by the registrant against all
expenses (including attorneys&#146; fees) actually and reasonably incurred in connection therewith.
Expenses must be advanced to an Indemnitee under certain circumstances.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant has entered into indemnification agreements with each of its directors and its
executive officers. These indemnification agreements may require it, among other things, to
indemnify its directors and executive officers for some expenses, including attorneys&#146; fees,
judgments, fines and settlement amounts incurred by a director or executive officer in any action
or proceeding arising out of his service as one of its directors or executive officers, or any of
its subsidiaries or any other company or enterprise to which the person provides services at its
request.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant maintains a general liability insurance policy that covers certain liabilities
of directors and officers of the corporation arising out of claims based on acts or omissions in
their capacities as directors or officers.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;7. Exemption from Registration Claimed.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;8. Exhibits.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Exhibit&nbsp;Index immediately preceding the exhibits is incorporated herein by reference.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Item&nbsp;9. Undertakings.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;<U><I>Item&nbsp;</I><I>512(a)</I><I> of Regulation&nbsp;S-K</I></U>. The undersigned registrant hereby undertakes:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the registration statement; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such
information in the registration statement;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%"><I>provided, however, </I>that paragraphs (i)&nbsp;and (ii)&nbsp;do not apply if the information required to
be included in a post-effective amendment by those paragraphs is contained in reports filed
with or
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->- 3 -<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">furnished to the Commission by the registrant pursuant to Section&nbsp;13 or Section 15(d) of the
Exchange Act that are incorporated by reference in the registration statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) That, for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration statement relating to
the securities offered therein, and the offering of such securities at that time shall be
deemed to be the initial <I>bona fide </I>offering thereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;<U><I>Item&nbsp;</I><I>512(b)</I><I> of Regulation&nbsp;S-K</I></U>. The undersigned registrant hereby undertakes that,
for purposes of determining any liability under the Securities Act, each filing of the registrant&#146;s
annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is incorporated
by reference in the registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial <I>bona fide </I>offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;<U><I>Item&nbsp;</I><I>512(h)</I><I> of Regulation&nbsp;S-K</I></U>. Insofar as indemnification for liabilities arising
under the Securities Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by the registrant of
expenses incurred or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final adjudication of such
issue.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->- 4 -<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, 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 to be signed on its behalf by the undersigned,
thereunto duly authorized, in the town of Framingham, Massachusetts,
on this 27<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> day of August,
2010.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Ameresco, Inc.<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">&nbsp;/s/&nbsp;George P. Sakellaris</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">George P. Sakellaris&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">President and Chief Executive Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY AND SIGNATURES</B>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We, the undersigned officers and directors of Ameresco, Inc. hereby severally constitute and
appoint George P. Sakellaris, David J. Corrsin and Andrew B. Spence, and each of them singly, our
true and lawful attorneys with full power to them, and each of them singly, to sign for us and in
our names in the capacities indicated below, the registration statement on Form S-8 filed herewith
and any and all subsequent amendments to said registration statement, and generally to do all such
things in our names and on our behalf in our capacities as officers and directors to enable
Ameresco, Inc. to comply with the provisions of the Securities Act of 1933, as amended, and all
requirements of the Securities and Exchange Commission, hereby ratifying and confirming our
signatures as they may be signed by our said attorneys, or any of them, to said registration
statement and any and all amendments thereto.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;George P. Sakellaris<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
George P. Sakellaris
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chairman of the
Board of <BR>
Directors,
President and <BR>
Chief Executive Officer
(Principal <BR>

Executive Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" nowrap>August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;Andrew B. Spence<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Andrew B. Spence
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial
Officer<br> (Principal
Financial and
Accounting Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;David J. Anderson<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
David J. Anderson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;David J. Corrsin<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
David J. Corrsin
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;William M. Bulger<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
William M. Bulger
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->- 5 -<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;Douglas
I. Foy<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Douglas
I. Foy
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" nowrap>August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;Michael
E. Jesanis
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Michael
E. Jesanis
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;Guy
W. Nichols<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Guy
W. Nichols
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/&nbsp;Joseph
W. Sutton<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Joseph
W. Sutton
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">August 27, 2010</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>







<P align="center" style="font-size: 10pt"><!-- Folio -->- 6 -<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INDEX TO EXHIBITS</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1(1)
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Restated Certificate of Incorporation of the Registrant</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2(1)
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-Laws of the Registrant</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Wilmer Cutler Pickering Hale and Dorr LLP, counsel to
the Registrant</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Caturano and Company, Inc.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Wilmer Cutler Pickering Hale and Dorr LLP
(included in Exhibit&nbsp;5.1)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of attorney (included on the signature pages of this
registration statement)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">99.1(1)
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">2000 Stock Incentive Plan</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Previously filed with the Securities and Exchange Commission as an Exhibit to the
Registrant&#146;s Registration Statement on Form S-1, as amended (File No.&nbsp;333-165821) and
incorporated herein by reference.</TD>
</TR>

</TABLE>




<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>



</BODY>
</HTML>
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sv8
As
filed with the Securities and Exchange Commission on August 27, 2010
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OF 1933
Ameresco, Inc.
(Exact Name of Registrant as Specified in Its Charter)
Delaware
04-3512838
(State or Other Jurisdiction of Incorporation
or Organization)
(I.R.S. Employer
Identification No.)
111 Speen Street, Suite 410
Framingham, Massachusetts
01701
(Zip Code)
(Address of Principal Executive Offices)
2000 Stock Incentive Plan
(Full Title of the Plan)
George P. Sakellaris
President and Chief Executive Officer
111 Speen Street, Suite 410
Framingham, Massachusetts 01701
(Name and Address of Agent For Service)
(508) 661-2200
(Telephone Number, Including Area Code, of Agent For Service)
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 12b2 of the Exchange Act.
Large accelerated filer
o
Accelerated filer
o
Non-accelerated filer
þ
Smaller reporting company
o
(Do not check if a smaller reporting company)
CALCULATION OF REGISTRATION FEE
Proposed Maximum
Proposed Maximum
Title of Securities
Amount to be
Offering Price Per
Aggregate Offering
Amount of
to be Registered
Registered(1)
Share
Price
Registration Fee
Class A Common
Stock, $0.0001 par
value per share
8,581,094  shares(2)
$10.91(3)
$93,619,736(3)
$6,676
(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)
Consists of 8,581,094 shares issuable under the 2000 Stock
Incentive Plan.
(3)
Estimated solely for the purpose of calculating the registration fee pursuant to Rules 457(c)
and 457(h) of the Securities Act of 1933, as amended, and based upon the average of the high
and low prices of the Registrant's Class A Common Stock as reported on the New York Stock
Exchange on August 20, 2010.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item 1. Plan Information.
The information required by Item 1 is included in documents sent or given to participants in
the plans covered by this registration statement pursuant to Rule 428(b)(1) of the Securities Act
of 1933, as amended (the "Securities Act").
Item 2. Registrant Information and Employee Plan Annual Information.
The written statement required by Item 2 is included in documents sent or given to
participants in the plans covered by this registration statement pursuant to Rule 428(b)(1) of the
Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The registrant is subject to the informational and reporting requirements of Sections 13(a),
14, and 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with the Securities and
Exchange Commission (the "Commission"). The following documents, which are on file with the
Commission, are incorporated in this registration statement by reference:
(a) The registrant's latest annual report filed pursuant to Section 13(a) or 15(d) of the
Exchange Act or the latest prospectus filed pursuant to Rule 424(b) under the Securities Act that
contains audited financial statements for the registrant's latest fiscal year for which such
statements have been filed.
(b) All other reports filed pursuant to Section 13(a) or 15(d) of the Exchange Act since the
end of the fiscal year covered by the document referred to in (a) above.
(c) The description of the securities contained in the registrant's registration statement on
Form 8-A filed under the Exchange Act, including any amendment or report filed for the purpose of
updating such description.
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 hereby 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 the 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 the purposes of this registration statement to the extent that a statement contained
herein or in any other subsequently filed document which also is or is deemed to be incorporated by
reference herein 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.
Item 4. Description of Securities.
Not applicable.
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Item 5. Interests of Named Experts and Counsel.
Not applicable.
Item 6. Indemnification of Directors and Officers.
Section 102 of the General Corporation Law of the State of Delaware permits a corporation to
eliminate the personal liability of directors of a corporation to the corporation or its
stockholders for monetary damages for a breach of fiduciary duty as a director, except where the
director breached his duty of loyalty, failed to act in good faith, engaged in intentional
misconduct or knowingly violated a law, authorized the payment of a dividend or approved a stock
repurchase in violation of Delaware corporate law or obtained an improper personal benefit. The
registrant's restated certificate of incorporation provides that no director shall be personally
liable to it or its stockholders for monetary damages for any breach of fiduciary duty as director,
notwithstanding any provision of law imposing such liability, except to the extent that the
Delaware General Corporation Law prohibits the elimination or limitation of liability of directors
for breaches of fiduciary duty.
Section 145 of the Delaware General Corporation Law provides that a corporation has the power
to indemnify a director, officer, employee, or agent of the corporation and certain other persons
serving at the request of the corporation in related capacities against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlements actually and reasonably incurred
by the person in connection with an action, suit or proceeding to which he is or is threatened to
be made a party by reason of such position, if such person acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the corporation and, in any
criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful, except
that, in the case of actions brought by or in the right of the corporation, no indemnification
shall be made with respect to any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that the Court of Chancery
or other adjudicating court determines that, despite the adjudication of liability but in view of
all of the circumstances of the case, such person is fairly and reasonably entitled to indemnity
for such expenses which the Court of Chancery or such other court shall deem proper.
The registrant's restated certificate of incorporation provides that it will indemnify each
person who was or is a party or threatened to be made a party to any threatened, pending or
completed action, suit or proceeding (other than an action by or in the right of the registrant) by
reason of the fact that he or she is or was, or has agreed to become, a director or officer of the
registrant, or is or was serving, or has agreed to serve, at the registrant's request as a
director, officer, partner, employee or trustee of, or in a similar capacity with, another
corporation, partnership, joint venture, trust or other enterprise (all such persons being referred
to as an Indemnitee), or by reason of any action alleged to have been taken or omitted in such
capacity, against all expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred in connection with such action, suit or proceeding and
any appeal therefrom, if such Indemnitee acted in good faith and in a manner he or she reasonably
believed to be in, or not opposed to, our best interests, and, with respect to any criminal action
or proceeding, he or she had no reasonable cause to believe his or her conduct was unlawful. The
registrant's restated certificate of incorporation provides that it will indemnify any Indemnitee
who was or is a party to an action or suit by or in the right of the registrant to procure a
judgment in the registrant's favor by reason of the fact that the Indemnitee is or was, or has
agreed to become, a director or officer of the registrant, or is or was serving, or has agreed to
serve, at the registrant's request as a director, officer, partner, employee or trustee or, or in a
similar capacity with, another corporation, partnership, joint venture, trust or other enterprise,
or by reason of any action alleged to have been taken or omitted in such capacity, against all
expenses (including attorneys' fees) and, to the extent permitted by law, amounts paid in
settlement actually and reasonably incurred in connection with such action, suit or proceeding, and
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any appeal therefrom, if the Indemnitee acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the registrant, except that
no indemnification shall be made with respect to any claim, issue or matter as to which such person
shall have been adjudged to be liable to the registrant, unless a court determines that, despite
such adjudication but in view of all of the circumstances, he or she is entitled to indemnification
of such expenses. Notwithstanding the foregoing, to the extent that any Indemnitee has been
successful, on the merits or otherwise, he or she will be indemnified by the registrant against all
expenses (including attorneys' fees) actually and reasonably incurred in connection therewith.
Expenses must be advanced to an Indemnitee under certain circumstances.
The registrant has entered into indemnification agreements with each of its directors and its
executive officers. These indemnification agreements may require it, among other things, to
indemnify its directors and executive officers for some expenses, including attorneys' fees,
judgments, fines and settlement amounts incurred by a director or executive officer in any action
or proceeding arising out of his service as one of its directors or executive officers, or any of
its subsidiaries or any other company or enterprise to which the person provides services at its
request.
The registrant maintains a general liability insurance policy that covers certain liabilities
of directors and officers of the corporation arising out of claims based on acts or omissions in
their capacities as directors or officers.
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits.
The Exhibit Index immediately preceding the exhibits is incorporated herein by reference.
Item 9. Undertakings.
1.
Item
512(a)
of Regulation S-K
. The undersigned registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii) To reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the registration statement; and
(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such
information in the registration statement;
provided, however,
that paragraphs (i) and (ii) do not apply if the information required to
be included in a post-effective amendment by those paragraphs is contained in reports filed
with or
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furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the
Exchange Act that are incorporated by reference in the registration statement.
(2) That, for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration statement relating to
the securities offered therein, and the offering of such securities at that time shall be
deemed to be the initial
bona fide
offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
2.
Item
512(b)
of Regulation S-K
. The undersigned registrant hereby undertakes that,
for purposes of determining any liability under the Securities Act, each filing of the registrant's
annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is incorporated
by reference in the registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial
bona fide
offering thereof.
3.
Item
512(h)
of Regulation S-K
. Insofar as indemnification for liabilities arising
under the Securities Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by the registrant of
expenses incurred or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final adjudication of such
issue.
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SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, 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 to be signed on its behalf by the undersigned,
thereunto duly authorized, in the town of Framingham, Massachusetts,
on this 27
th
day of August,
2010.
Ameresco, Inc.
By:
/s/ George P. Sakellaris
George P. Sakellaris
President and Chief Executive Officer
POWER OF ATTORNEY AND SIGNATURES
We, the undersigned officers and directors of Ameresco, Inc. hereby severally constitute and
appoint George P. Sakellaris, David J. Corrsin and Andrew B. Spence, and each of them singly, our
true and lawful attorneys with full power to them, and each of them singly, to sign for us and in
our names in the capacities indicated below, the registration statement on Form S-8 filed herewith
and any and all subsequent amendments to said registration statement, and generally to do all such
things in our names and on our behalf in our capacities as officers and directors to enable
Ameresco, Inc. to comply with the provisions of the Securities Act of 1933, as amended, and all
requirements of the Securities and Exchange Commission, hereby ratifying and confirming our
signatures as they may be signed by our said attorneys, or any of them, to said registration
statement and any and all amendments thereto.
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 P. Sakellaris
George P. Sakellaris
Chairman of the
Board of
Directors,
President and
Chief Executive Officer
(Principal
Executive Officer)
August 27, 2010
/s/ Andrew B. Spence
Andrew B. Spence
Chief Financial
Officer
(Principal
Financial and
Accounting Officer)
August 27, 2010
/s/ David J. Anderson
David J. Anderson
Director
August 27, 2010
/s/ David J. Corrsin
David J. Corrsin
Director
August 27, 2010
/s/ William M. Bulger
William M. Bulger
Director
August 27, 2010
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Signature
Title
Date
/s/ Douglas
I. Foy
Douglas
I. Foy
Director
August 27, 2010
/s/ Michael
E. Jesanis
Michael
E. Jesanis
Director
August 27, 2010
/s/ Guy
W. Nichols
Guy
W. Nichols
Director
August 27, 2010
/s/ Joseph
W. Sutton
Joseph
W. Sutton
Director
August 27, 2010
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INDEX TO EXHIBITS
Number
Description
4.1(1)
Restated Certificate of Incorporation of the Registrant
4.2(1)
Amended and Restated By-Laws of the Registrant
5.1
Opinion of Wilmer Cutler Pickering Hale and Dorr LLP, counsel to
the Registrant
23.1
Consent of Caturano and Company, Inc.
23.2
Consent of Wilmer Cutler Pickering Hale and Dorr LLP
(included in Exhibit 5.1)
24.1
Power of attorney (included on the signature pages of this
registration statement)
99.1(1)
2000 Stock Incentive Plan
(1)
Previously filed with the Securities and Exchange Commission as an Exhibit to the
Registrant's Registration Statement on Form S-1, as amended (File No. 333-165821) and
incorporated herein by reference.