<SUBMISSION>
<ACCESSION-NUMBER>0001104659-16-133378
<TYPE>SC TO-I/A
<PUBLIC-DOCUMENT-COUNT>1
<FILING-DATE>20160720
<DATE-OF-FILING-DATE-CHANGE>20160719
<SUBJECT-COMPANY>
<COMPANY-DATA>
<CONFORMED-NAME>ATLANTIC POWER CORP
<CIK>0001419242
<ASSIGNED-SIC>4900
<IRS-NUMBER>550886410
<STATE-OF-INCORPORATION>A1
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC TO-I/A
<ACT>34
<FILE-NUMBER>005-87139
<FILM-NUMBER>161774364
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 220
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
<PHONE>617-977-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 220
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
</MAIL-ADDRESS>
</SUBJECT-COMPANY>
<FILED-BY>
<COMPANY-DATA>
<CONFORMED-NAME>ATLANTIC POWER CORP
<CIK>0001419242
<ASSIGNED-SIC>4900
<IRS-NUMBER>550886410
<STATE-OF-INCORPORATION>A1
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC TO-I/A
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 220
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
<PHONE>617-977-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 220
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
</MAIL-ADDRESS>
</FILED-BY>
<DOCUMENT>
<TYPE>SC TO-I/A
<SEQUENCE>1
<FILENAME>a16-14569_1sctoia.htm
<DESCRIPTION>SC TO-I/A
<TEXT>


<html>
<head>




  </head>
<body link=blue lang="EN-US">
<div style="font-family:Times New Roman;">
<div style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:solid windowtext 3.0pt;padding:1.0pt 0in 1.0pt 0in;">
<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
</div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">UNITED STATES</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;">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, D.C. 20549</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">SCHEDULE 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;">(Amendment No.&nbsp;3)</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></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;">Tender Offer Statement under Section&nbsp;14(d)(1)&nbsp;or Section&nbsp;13(e)(1)<br> of the Securities Exchange Act of 1934</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">ATLANTIC POWER CORPORATION</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 of Subject Company and Filing Person (Issuer) and Name of Filing Person (Offeror))</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">5.75% Series&nbsp;C Convertible Unsecured Subordinated Debentures due June&nbsp;2019</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;">(Title of Class&nbsp;of Securities)</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">04878QAQ6</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;">(CUSIP Number of Class&nbsp;of Securities)</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">Jeffrey S. Levy,&nbsp;Esq.</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;">Senior Vice President and General Counsel</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;">3 Allied Drive, Suite&nbsp;220</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;">Dedham, Massachusetts</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;">(617) 977-2400</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 person authorized to<br> receive notices and communications on behalf of filing person)</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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;">Copy to:</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;">Craig B. Brod,&nbsp;Esq.</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;">Pamela L. Marcogliese,&nbsp;Esq.</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;">Cleary Gottlieb Steen&nbsp;&amp; Hamilton LLP</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;">One Liberty Plaza</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;">New York, New York 10006</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;">(212) 225-2000</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center" style="margin:0in 0in .0001pt;text-align:center;"><hr size="1" width="25%" noshade align="center" style="color:black;"></div>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&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 FILING FEE</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div align="center">
<table border="0" cellspacing="0" cellpadding="0" width="93%" style="border-collapse:collapse;">
<tr>
<td width="46%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:46.42%;">
<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;">Transaction&nbsp;Valuation</font></b><b><font size="1" style="font-size:5.0pt;font-weight:bold;position:relative;top:-3.0pt;">(1)</font></b></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.68%;">
<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="50%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:50.9%;">
<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&nbsp;Filing&nbsp;Fee</font></b><b><font size="1" style="font-size:5.0pt;font-weight:bold;position:relative;top:-3.0pt;">(2)</font></b></p>    </td>   </tr>
<tr>
<td width="46%" valign="top" bgcolor="black" style="background:white;padding:0in 0in 0in 0in;width:46.42%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$62,725,000</font></p>    </td>
<td width="2%" valign="top" bgcolor="black" style="background:white;padding:0in 0in 0in 0in;width:2.68%;">
<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%" valign="top" bgcolor="black" style="background:white;padding:0in 0in 0in 0in;width:50.9%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$6,316.41</font></p>    </td>   </tr>  </table>
</div>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade align="left" style="color:black;"></div>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="1" face="Times New Roman" style="font-size:6.5pt;position:relative;top:-3.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Calculated solely for the purposes of determining the filing fee based upon a transaction value of $62,725,000. The purchase price of the 5.75% Series&nbsp;C Convertible Unsecured Debentures due June&nbsp;2019 (the &#147;Debentures&#148;), as described herein, is $965 per $1,000 principal amount outstanding. The Company is seeking to acquire up to $65,000,000 of Debentures resulting in an aggregate maximum purchase price of $62,725,000.</p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="1" face="Times New Roman" style="font-size:6.5pt;position:relative;top:-3.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The amount of the filing fee equals $100.70 for each $1,000,000 of the value of the transaction.</p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Check the box if any part of the fee is offset as provided by Rule&nbsp;0-11(a)(2)&nbsp;and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form&nbsp;or Schedule and the date of its filing.</p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:23.65pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<tr>
<td width="41%" valign="top" style="padding:0in 0in 0in 0in;width:41.66%;">
<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amount Previously Paid: $6,316.41</font></p>    </td>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Filing Party:</font></p>    </td>
<td width="48%" valign="top" style="padding:0in 0in 0in 0in;width:48.08%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Atlantic Power Corporation</font></p>    </td>   </tr>
<tr>
<td width="41%" valign="top" style="padding:0in 0in 0in 0in;width:41.66%;">
<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of Registration No.: Schedule TO</font></p>    </td>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.26%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date Filed:</font></p>    </td>
<td width="48%" valign="top" style="padding:0in 0in 0in 0in;width:48.08%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">June&nbsp;17, 2016</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Check the box if filing relates solely to preliminary communications made before the commencement of a tender offer.</p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .05in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate boxes below to designate any transactions to which the statement relates:</font></p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>third-party tender offer subject to Rule&nbsp;14d-1.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>issuer tender offer subject to Rule&nbsp;13e-4.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>going-private transaction subject to Rule&nbsp;13e-3.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>amendment to Schedule&nbsp;13D under Rule&nbsp;13d-2.</p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the following box if the filing is a final amendment reporting the results of the tender offer: </font><font face="Wingdings">o</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div style="border-bottom:solid windowtext 3.0pt;border-left:none;border-right:none;border-top:solid windowtext 1.0pt;padding:1.0pt 0in 1.0pt 0in;">
<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
</div>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\109206\16-14569-1\task8022429\14569-1-ca.htm',USER='109206',CD='Jul 16 14:31 2016' -->


<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">
<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="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Amendment No.&nbsp;3 (this &#147;<b>Amendment</b>&#148;) amends and supplements the Tender Offer Statement on Schedule TO (the &#147;<b>Schedule TO</b>&#148;) previously filed by Atlantic Power Corporation (the &#147;<b>Company</b>&#148;) on June&nbsp;17, 2016, as amended by Amendment No.&nbsp;1, dated June&nbsp;22, 2016, and by Amendment No.&nbsp;2, dated July&nbsp;6, 2016.</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;">The Schedule TO relates to the offer (the &#147;<b>Offer</b>&#148;) by the Company to purchase up to $65,000,000 aggregate principal amount of the Company&#146;s outstanding 5.75% Series&nbsp;C Convertible Unsecured Subordinated Debentures due June&nbsp;2019 (the &#147;<b>Debentures</b>&#148;) for cash, at the purchase price of US$965 per US$1,000 principal amount of Debentures, plus accrued and unpaid interest to, but not including, the payment date, upon the terms and subject to the conditions set forth in the Offer to Purchase and related Issuer Bid Circular, each dated June&nbsp;16, 2016 (as they may be amended and supplemented from time to time, the &#147;<b>Offer and Circular</b>&#148;), and the related Letter of Transmittal, as it may be amended and supplemented from time to time, copies of which were attached to the Schedule TO as Exhibits (a)(1)(i)&nbsp;and (a)(1)(ii), respectively. Capitalized terms used but not defined in this Amendment shall have the meanings given to them in the Offer and Circular.</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;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Items 1 through 11.</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 style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In the ultimate paragraph of the section of the Offer and Circular entitled &#147;Offer to Purchase &#151; 5.&nbsp;Conditions of the Offer&#148; the first sentence shall be replaced with the following sentence:</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;">&#147;The foregoing conditions are for the exclusive benefit of the Company and may be asserted by the Company at any time prior to the Expiration Date in its reasonable discretion regardless of the circumstances giving rise to any such assertion (excluding any action or inaction by the Company), or may (subject to applicable law) be waived by the Company in whole or in part at any time prior to the Expiration Date in its discretion, without prejudice to any other rights which the Company may have.&#148;</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;">The first seven sentences of the third paragraph in the section of the Offer and Circular entitled &#147;Issuer Bid Circular &#151; 5.&nbsp;Valuation of the Debentures &#151; Assumptions and Limitations&#148; are replaced with the following sentences:</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;">&#147;Alexander Capital&#146;s Formal Valuation states that Alexander Capital shall have no responsibility whatsoever to any third party, that any use a third party makes of the Formal Valuation is entirely at its own risk, that the Formal Valuation has been prepared and provided solely for the use of the Board and for inclusion in the Offer and Circular, and that it may not be used or relied upon by any other person without Alexander Capital&#146;s express prior written consent (the &#147;<b>Disclaimer Statements</b>&#148;). The Disclaimer Statements are fully consistent with Canadian market practice for valuations prepared under Multilateral Instrument 61-101 Protection of Minority Security Holders in Special Transactions (&#147;<b>MI 61-101</b>&#148;), which is the Canadian legal instrument requiring the inclusion of a formal valuation in the Offer and Circular. The Formal Valuation is addressed to the Board of Directors of Atlantic Power, and was prepared solely for the purpose of providing advice to the Board of Directors in forming its view regarding the value of the Debentures. The engagement letter between Alexander Capital and Atlantic Power, which is governed by the laws of the Province of Ontario, Canada, specifically provides that the opinions, advice and materials, including any report, to be provided by Alexander Capital in carrying out its engagement are intended solely for the use of Atlantic Power, its Board of Directors and its affiliates. Alexander Capital has been advised by its Canadian legal counsel that under applicable Ontario contract law principles and the general principles of the law of negligent misstatement as it applies in Ontario</font></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="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">2<a name="PB_2_140221_9297"></a></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\109206\16-14569-1\task8022403\14569-1-cc.htm',USER='109206',CD='Jul 16 14:02 2016' -->

<br clear="all" style="page-break-before:always;">
<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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(including the House of Lords decision in Hedley Byrne&nbsp;&amp; Co. v. Heller&nbsp;&amp; Partners Ltd., [1963] 2 All E.R. 575 and subsequent Ontario judicial decisions), holders of Debentures should not be able to rely on its Formal Valuation. Alexander Capital has indicated that it intends to assert the substance of the Disclaimer Statements as a defense to any claims by Debentureholders that might be brought against it under Ontario law or other applicable law. However, Alexander Capital is not aware of any legislation, administrative rule&nbsp;or judicial decision under the laws of the Province of Ontario or any other jurisdiction that has specifically addressed the availability of such a defense in connection with a claim brought by a securityholder against the preparer of a formal valuation prepared in accordance with the requirements of MI 61-101 and included in a public disclosure document. The issue necessarily would have to be resolved by a court of competent jurisdiction in the Province of Ontario or any other jurisdiction where a Debentureholder may advance such a claim. The availability or non-availability of such a defense will have no effect on the rights and responsibilities of the Company&#146;s Board of Directors under any applicable law, or the rights and responsibilities of the Board of Directors or Alexander Capital under the U.S. federal securities laws.&#148;</font></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="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">3<a name="PB_3_140227_7056"></a></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='3',FILE='C:\JMS\109206\16-14569-1\task8022403\14569-1-cc.htm',USER='109206',CD='Jul 16 14:02 2016' -->


<br clear="all" style="page-break-before:always;">
<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;">SIGNATURE</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 style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">After due inquiry and to the best of my knowledge and belief,&nbsp;I certify that the information set forth in this statement is true, complete and correct.</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>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<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="3" 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;">ATLANTIC POWER CORPORATION</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="3" 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:10.0pt;">&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;">&nbsp;</font></p>    </td>
<td width="45%" colspan="2" 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;">&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%" colspan="2" 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/ James J.   Moore,&nbsp;Jr.</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="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.84%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>    </td>
<td width="40%" valign="top" style="padding:0in 0in 0in 0in;width:40.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">James J.   Moore,&nbsp;Jr.</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="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.84%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>    </td>
<td width="40%" valign="top" style="padding:0in 0in 0in 0in;width:40.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President and Chief   Executive Officer</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="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;">&nbsp;</font></p>    </td>
<td width="45%" colspan="2" 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;">&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:10.0pt;">Date: July&nbsp;19, 2016</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%" colspan="2" 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: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="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">4<a name="PB_4_140318_5335"></a></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='4',FILE='C:\JMS\109501\16-14569-1\task8025100\14569-1-jc.htm',USER='109501',CD='Jul 20 04:04 2016' -->

<br clear="all" style="page-break-before:always;">
<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 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;">INDEX TO 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>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<tr>
<td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit<br>   Number</font></b></p>    </td>
<td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.66%;">
<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="88%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:88.34%;">
<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="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)(1)(i)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Offer to Purchase and Issuer Bid Circular, dated   June&nbsp;16, 2016.</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)(1)(ii)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Letter of Transmittal, dated June&nbsp;16, 2016.</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)(5)(i)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press Release, dated June&nbsp;16, 2016   (incorporated by reference to the pre-commencement communication of the   Company on Schedule TO, filed with the SEC on June&nbsp;16, 2016).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(1)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Agreement between the Company and Polar   Multi-Strategy Master Fund, dated June&nbsp;16, 2016, to tender an aggregate   of approximately US$15,000,000 principal amount of Debentures pursuant to the   Offer.</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(2)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Agreement between the Company, Twin Lake Total   Return Partners QP L.P., Twin Lake Total Return Partners L.P.,&nbsp;Iron Road   Multi Strategy Fund, L.P. and Iron Road Diversified Fund, L.P., dated June&nbsp;16,   2016, to tender an aggregate of approximately US$14,661,000 principal amount   of Debentures pursuant to the Offer.</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(3)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Trust Indenture Providing for the Issue of   Convertible Unsecured Subordinated Debentures, dated as of December&nbsp;17,   2009, between Atlantic Power Corporation and Computershare Trust Company of   Canada (incorporated by reference to the Company&#146;s registration statement on   Form&nbsp;10-12B filed on April&nbsp;13, 2010).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(4)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Second Supplemental Indenture to the Trust Indenture   Providing for the Issue of Convertible Unsecured Subordinated Debentures,   dated as of July&nbsp;5, 2012, between Atlantic Power Corporation and   Computershare Trust Company of Canada (incorporated by reference to the   Company&#146;s Current Report on Form&nbsp;8-K filed on July&nbsp;6, 2012).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(5)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sixth Supplemental Indenture to the Trust Indenture   Providing for the Issue of Convertible Unsecured Subordinated Debentures,   dated as of March&nbsp;22, 2013, between Atlantic Power Corporation and   Computershare Trust Company of Canada (incorporated by reference to the   Company&#146;s Current Report on Form&nbsp;8-K filed on March&nbsp;26, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(6)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Trust Indenture, dated as of October&nbsp;11, 2006   between Atlantic Power Corporation and Computershare Trust Company of Canada   (incorporated by reference to the Company&#146;s registration statement on   Form&nbsp;10-12B filed on April&nbsp;13, 2010).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(7)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">First Supplemental Indenture to the Trust Indenture   Providing for the Issue of Convertible Secured Debentures, dated   November&nbsp;27, 2009, between Atlantic Power Corporation and Computershare   Trust Company of Canada (incorporated by reference to the Company&#146;s   registration statement on Form&nbsp;10-12B filed on April&nbsp;13,   2010).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(8)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Fourth Supplemental Indenture, dated as of   August&nbsp;3, 2012, by and among Atlantic Rockland Holdings,&nbsp;LLC,   Atlantic Power Corporation, the Guarantors named therein and Wilmington   Trust, National Association (incorporated by reference to our Annual Report   on Form&nbsp;10-K filed on March&nbsp;1, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(9)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Fifth Supplemental Indenture, dated as of November&nbsp;29,   2012, by and among Atlantic Ridgeline Holdings,&nbsp;LLC, Atlantic Power   Corporation, the Guarantors named therein and Wilmington Trust, National   Association (incorporated by reference to the Company&#146;s Annual Report on   Form&nbsp;10-K filed on March&nbsp;1, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(10)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shareholder Rights Plan Agreement, dated effective   as of February&nbsp;28, 2013, between Atlantic Power Corporation and   Computershare Investor Services,&nbsp;Inc., which includes the Form&nbsp;of   Right Certificate as Exhibit&nbsp;A (incorporated by reference to the   Company&#146;s Current</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="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">5<a name="PB_5_140318_5796"></a></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='5',FILE='C:\JMS\109501\16-14569-1\task8025100\14569-1-jc.htm',USER='109501',CD='Jul 20 04:04 2016' -->

<br clear="all" style="page-break-before:always;">
<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>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<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="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Report on Form&nbsp;8-K filed on February&nbsp;28,   2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(11)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Deferred Share Unit Plan, dated as of April&nbsp;24,   2007 of Atlantic Power Corporation (incorporated by reference to the   Company&#146;s registration statement on Form&nbsp;10-12B filed on   April&nbsp;13, 2010).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(12)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Fifth Amended and Restated Long-Term Incentive   Plan (incorporated by reference to the Company&#146;s Current Report on   Form&nbsp;8-K filed on April&nbsp;11, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(13)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;1 to the Fifth Amended and   Restated Long-Term Incentive Plan of the Company (incorporated by   reference to Exhibit&nbsp;A to Schedule&nbsp;B of the Company&#146;s definitive   Proxy Statement on Schedule&nbsp;14A filed on April&nbsp;30, 2014).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(14)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Participation Agreement and Confirmation   (performance-based vesting) between the Company and Terrence Ronan,   dated April&nbsp;11, 2013 (incorporated by reference to the Company&#146;s   Quarterly Report on Form&nbsp;10-Q filed on August&nbsp;8, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(15)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Participation Agreement and Confirmation   (time-vesting) between the Company and Terrence Ronan, dated   April&nbsp;11, 2013 (incorporated by reference to the Company&#146;s Quarterly   Report on Form&nbsp;10-Q filed on August&nbsp;8, 2013).</font></p>    </td>   </tr>
<tr>
<td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)(16)&#134;</font></p>    </td>
<td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.66%;">
<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:88.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Transition Equity Grant Participation Agreement between   Atlantic Power Services,&nbsp;LLC and James J. Moore,&nbsp;Jr., dated   January&nbsp;22, 2015 (incorporated by reference to the Company&#146;s Current   Report on Form&nbsp;8-K filed on January&nbsp;23, 2015).</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>
<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade align="left" style="color:black;"></div>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;">&#134;</font>&#160; </font>Previously filed as an exhibit to the Schedule TO filed on June&nbsp;17, 2016.</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="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">6<a name="PB_6_140318_2897"></a></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
</div>
<!-- SEQ.=1,FOLIO='6',FILE='C:\JMS\109501\16-14569-1\task8025100\14569-1-jc.htm',USER='109501',CD='Jul 20 04:04 2016' -->

</body>
</html>
</TEXT>
</DOCUMENT>
</SUBMISSION>
