<SUBMISSION>
<ACCESSION-NUMBER>0001104659-20-054935
<TYPE>SC TO-I/A
<PUBLIC-DOCUMENT-COUNT>3
<FILING-DATE>20200501
<DATE-OF-FILING-DATE-CHANGE>20200501
<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>20838296
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 155
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
<PHONE>617-977-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 155
<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 155
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
<PHONE>617-977-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3 ALLIED DRIVE
<STREET2>SUITE 155
<CITY>DEDHAM
<STATE>MA
<ZIP>02026
</MAIL-ADDRESS>
</FILED-BY>
<DOCUMENT>
<TYPE>SC TO-I/A
<SEQUENCE>1
<FILENAME>a20-18294_1sctoia.htm
<DESCRIPTION>SC TO-I/A
<TEXT>


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<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="1" face="Times New Roman" style="font-size:2.0pt;">&nbsp;</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:5.0pt;font-weight:bold;">&nbsp;</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES</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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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;">(Amendment No.&nbsp;1)</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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;">Common Shares, no par value per share,</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;">and the associated Rights to Purchase Common Shares</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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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;">04878Q863</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:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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, General Counsel and Corporate Secretary</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;155</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 02026</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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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;">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;">Neil R. Markel,&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<tr>
<td width="49%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:49.02%;">
<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(1)</font></b></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
<td width="49%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:49.04%;">
<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(2)</font></b></p>    </td>   </tr>
<tr>
<td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.02%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$25,000,000</font></p>    </td>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.04%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$3,245</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:3.0pt;">&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="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#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 $25,000,000, an aggregate of up to 12,820,512 common shares at a purchase price of not more than $2.20 and not less than $1.95 per share in cash.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The amount of the filing fee, calculated in accordance with Rule&nbsp;0-11 under the Securities Exchange Act of 1934, as amended, equals $129.80 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:5.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt 9.0pt;text-indent:-9.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font> Check 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 style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;">
<tr>
<td width="21%" valign="top" style="padding:0in 0in 0in 0in;width:21.08%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amount Previously Paid:</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.76%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$3,245.</font></p>    </td>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.58%;">
<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="29%" valign="top" style="padding:0in 0in 0in 0in;width:29.58%;">
<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="21%" valign="top" style="padding:0in 0in 0in 0in;width:21.08%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;or   Registration No.:</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.76%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Schedule TO.</font></p>    </td>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.58%;">
<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="29%" valign="top" style="padding:0in 0in 0in 0in;width:29.58%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;25, 2020.</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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> Check the box if the 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:5.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">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:5.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>third-party tender offer subject to Rule&nbsp;14d-1.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>issuer tender offer subject to Rule&nbsp;13e-4.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>going-private transaction subject to Rule&nbsp;13e-3.</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>amendment to Schedule 13D under Rule&nbsp;13d-2.</p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><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 style="margin:0in 0in .0001pt;text-indent:38.25pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#168;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">If applicable, check the appropriate box(es) below to designate the appropriate rule&nbsp;provision(s)&nbsp;relied upon:</font></p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>Rule&nbsp;13e-4(i)&nbsp;(Cross-Border Issuer Tender Offer)</p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><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; </font>Rule&nbsp;14d-1(d)&nbsp;(Cross-Border Third Party Tender Offer)</p>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&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:2.0pt;">&nbsp;</font></p>
</div>
<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade align="left" style="color:#010101;"></div>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXPLANATORY NOTE</font></b></p>
<p 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;">This Amendment No.&nbsp;1 (this &#147;<b>Amendment</b>&#148;) amends and supplements the Tender Offer Statement on Schedule TO filed with the Securities and Exchange Commission on March&nbsp;25, 2020 (as amended and supplemented by this Amendment and as it may be further amended from time to time, the &#147;<b>Schedule TO</b>&#148;) as it relates to the offer (the &#147;<b>Offer</b>&#148;) by Atlantic Power Corporation, a British Columbia corporation (the &#147;<b>Company</b>&#148;), to holders of its common shares, no par value (together with the purchase rights associated with such common shares, the &#147;<b>Common Shares</b>&#148;), to purchase up to an aggregate amount of $25,000,000 of such Common Shares for cash at a price of not more than US$2.20 per Common Share and not less than US$1.95 per Common Share (subject to any applicable withholding taxes), without interest, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated March&nbsp;25, 2020, and accompanying Issuer Bid Circular (the &#147;<b>Offer and Circular</b>&#148;), and the related Letter of Transmittal and Notice of Guaranteed Delivery, copies of which are attached to the Schedule TO as Exhibits (a)(1)(i), (a)(1)(ii)&nbsp;and (a)(1)(iii), respectively, and which, collectively, as amended or supplemented from time to time, constitute the &#147;<b>Offer Documents</b>&#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 information in the Schedule TO, including all exhibits to the Schedule TO, which were previously filed with the Schedule TO or any amendment thereto is incorporated herein by reference in response to Items 1 through 11 of the Schedule TO, except that such information is hereby amended and supplemented to the extent specifically provided in this Amendment.&#160; Except as specifically set forth herein, this Amendment does not modify any of the information previously reported on the Schedule TO.&#160; All capitalized terms used but not specifically defined in this Amendment No.&nbsp;1 shall have the meanings given to such terms in the Offer and Circular.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The items of the Schedule TO set forth below are hereby amended and supplemented as follows:</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 4.</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;">Item 4 of the Schedule TO is hereby amended and supplemented by adding the following:</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 Offer expired at 5:00p.m.&nbsp;(Toronto time) on Thursday, April&nbsp;30, 2020. On May&nbsp;1, 2020, the Company issued a press release announcing the preliminary results of the Offer. Based on a preliminary count by Computershare Trust Company of Canada, as depositary for the Offer (the &#147;<b>Depositary</b>&#148;), the Company expects to take up and purchase for cancellation 12,500,000 Common Shares at a purchase price of US$2.00 per Common Share, for aggregate consideration of US$25 million. The Common Shares expected to be purchased under the Offer represent approximately 12% of the Common Shares issued and outstanding at the time the Offer was announced. After giving effect to the cancellation of the Common Shares purchased by the Company under the Offer, 93,002,338 Common Shares are expected to be issued and outstanding. Based on the Depositary&#146;s preliminary count, approximately 28 million Common Shares were tendered to the Offer. As the Offer was oversubscribed, shareholders who made auction tenders at a price of US$2.00 or less per Common Share and purchase price tenders are expected to have approximately 81% of their successfully tendered Common Shares purchased by the Company, other than &#147;odd lot&#148; tenders, which are not subject to proration. Shareholders who made auction tenders at a price in excess of US$2.00 per Common Share will have their Common Shares returned by the Depositary.</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 full text of the Company&#146;s press release, dated May&nbsp;1, 2020, is filed as Exhibit&nbsp;(a)(5)(ii)&nbsp;hereto and is incorporated herein by reference.</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;">Item 12.&#160; Exhibits</font></b></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item 12 of the Schedule TO is hereby amended and supplemented by adding the following exhibit:</font></p>
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<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>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)(5)(ii)*</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;"><a href="a20-18294_1ex99da5ii.htm#Exhibita5ii_032216" title="Click to goto ">Press Release, dated May&nbsp;1, 2020.</a></font></p>    </td>   </tr>  </table>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">* Filed herewith.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURE</font></b></p>
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<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>
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<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>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ JAMES J. MOORE, JR.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name: James J.   Moore,&nbsp;Jr.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title: President and Chief Executive Officer</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: May&nbsp;1, 2020</font></p>    </td>
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<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit (a)(5)(ii)<a name="Exhibita5ii_032216"></a></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;"><font size="2" face="Times New Roman"><img width="211" height="62" src="g182941mmi001.jpg"></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Atlantic Power Corporation Announces Preliminary Results of Substantial Issuer Bid</font></b></p>
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<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">DEDHAM, Mass., May&nbsp;1, 2020</font> &#151; Atlantic Power Corporation (NYSE: AT) (TSX: ATP) (&#147;Atlantic Power&#148; or the &#147;Company&#148;) announces today the preliminary results of its substantial issuer bid to purchase from holders of the common shares of the Company (together with the purchase rights associated with such common shares, the &#147;Common Shares&#148;) up to US$25 million of the Common Shares (the &#147;Offer&#148;). The Offer expired at 5:00 p.m.&nbsp;Toronto time on April&nbsp;30, 2020.</p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In accordance with the terms and conditions of the Offer and based on a preliminary count by Computershare Trust Company of Canada (the &#147;Depositary&#148;), the Company expects to take up and purchase for cancellation </font>12,500,000 Common Shares at a purchase price of US$2.00 per Common Share (the &#147;Purchase Price&#148;), for aggregate consideration of US$25 million. The Common Shares expected to be purchased under the Offer represent approximately 12% of the Common Shares issued and outstanding at the time the Offer was announced. After giving effect to the cancellation of the Common Shares purchased by the Company under the Offer, 93,002,338 Common Shares are expected to be issued and outstanding.</p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Offer was made by way of a modified Dutch auction. Holders of Common Shares (&#147;Shareholders&#148;) wishing to tender to the Offer were able to do so pursuant to (i)&nbsp;auction tenders in which they specified the number of Common Shares being tendered at a price of not less than US$1.95 and not more than US$2.20 in increments of US$0.05 per Common Share, or (ii)&nbsp;purchase price tenders in which they did not specify a price per Common Share, but rather agreed to have a specified number of Common Shares purchased at the Purchase Price determined by the auction tenders.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Based on the Depositary&#146;s preliminary count, approximately </font>28 million Common Shares were tendered to the Offer. As the Offer was oversubscribed, shareholders who made auction tenders at a price of US$2.00 or less per Common Share and purchase price tenders are expected to have approximately 81% of their successfully tendered Common Shares purchased by the Company, other than &#147;odd lot&#148; tenders, which are not subject to proration. Shareholders who made auction tenders at a price in excess of US$2.00 per Common Share will have their Common Shares returned by the Depositary.</p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The number of Common Shares to be purchased under the Offer and the Purchase Price are preliminary, subject to verification by the Depositary and assume that all Common Shares tendered through notice of guaranteed delivery will be delivered within the two business day settlement period. The Company will announce the final results following completion of take-up of the Common Shares.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The full details of the Offer are described in the offer to purchase and issuer bid circular dated March&nbsp;25, 2020, as well as the related letter of transmittal and notice of guaranteed delivery, copies of which were filed and are available on SEDAR at www.sedar.com and on EDGAR at www.sec.gov.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This news release is for informational purposes only and does not constitute an offer to buy or the solicitation of an offer to sell Common Shares.</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">About Atlantic Power</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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Atlantic Power is an independent power producer that owns power generation assets in eleven states in the United States and two provinces in Canada. The Company&#146;s generation projects sell electricity and steam to investment-grade utilities and other creditworthy large customers predominantly under long-term power purchase agreements that have expiration dates ranging from 2020 to 2043. The Company seeks to minimize its exposure to commodity prices through provisions in the contracts, fuel supply agreements and hedging arrangements. The projects are diversified by geography, fuel type, technology, dispatch profile and offtaker (customer). Approximately 75% of the projects in operation are 100% owned and directly operated and maintained by the Company. The Company has expertise in operating most fuel types, including gas, hydro, and biomass, and it owns a 40% interest in one coal project.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Atlantic Power&#146;s shares trade on the New York Stock Exchange under the symbol AT and on the Toronto Stock Exchange under the symbol ATP. For more information, please visit the Company&#146;s website at www.atlanticpower.com or contact:</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Atlantic Power Corporation&nbsp;<br> Investor Relations <br> (617) 977-2700&nbsp;<br> info@atlanticpower.com</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Copies of the Company&#146;s financial data and other publicly filed documents are available on SEDAR at www.sedar.com or on EDGAR at www.sec.gov/edgar.shtml under &#147;Atlantic Power Corporation&#148; or on the Company&#146;s website.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">********************************************************************************</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;">Cautionary Note Regarding Forward-Looking Statements</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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Certain statements in this news release may constitute forward-looking information or forward-looking statements within the meaning of applicable securities laws (collectively, &#147;forward-looking statements&#148;), which reflect the expectations of management regarding the future growth, results of operations, performance and business prospects and opportunities of the Company and its projects. These statements, which are based on certain assumptions and describe the Company&#146;s future plans, strategies and expectations, can generally be identified by the use of the words &#147;plans&#148;, &#147;expects&#148;, &#147;does not expect&#148;, &#147;is expected&#148;, &#147;budget&#148;, &#147;estimates&#148;, &#147;forecasts&#148;, &#147;intends&#148;, &#147;anticipates&#148; or &#147;does not anticipate&#148;, &#147;believes&#148;, &#147;outlook&#148;, &#147;objective&#148;, or &#147;continue&#148;, or equivalents or variations, including negative variations, of such words and phrases, or state that certain actions, events or results, &#147;may&#148;, &#147;could&#148;, &#147;would&#148;, &#147;should&#148;, &#147;might&#148; or &#147;will&#148; be taken, occur or be achieved.&#160; Examples of such statements in this press release include, but are not limited to, statements with respect to the number of Common Shares expected to be taken up under the Offer, and the Purchase Price for the Common Shares expected to be taken up under the Offer.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. Please refer to the factors discussed under &#147;Risk Factors&#148; and &#147;Forward-Looking Information&#148; in the Company&#146;s periodic reports as filed with the Securities and Exchange Commission from time to time for a detailed discussion of the risks and uncertainties affecting the Company. These risks and uncertainties include, but are not limited to, potential risks and uncertainties relating to the ultimate geographic spread of the novel coronavirus (COVID-19), the</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_024215_6377"></a></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">severity of the disease, the duration of the COVID-19 outbreak, actions that may be taken by governmental authorities to contain the COVID-19 outbreak or to treat its impact and the potential negative impacts of COVID-19 on the global economy and financial markets. The number of Common Shares and the Purchase Price under the Offer remain subject to verification by the Depositary and are subject to change. Although the forward-looking statements contained in this news release are based upon what are believed to be reasonable assumptions, investors cannot be assured that actual results will be consistent with these forward-looking statements, and the differences may be material. These forward-looking statements are made as of the date of this news release and, except as expressly required by applicable law, the Company assumes no obligation to update or revise them to reflect new events or circumstances.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;">For the avoidance of doubt, the above-mentioned Uniform Resource Locators (&#147;URLs&#148;) given in respect of web-site addresses are inactive textual references only and it is not intended to incorporate the contents of any such web sites into </font>this news release nor</font> should the contents of such web sites be deemed to be incorporated into this news release.</p>
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<p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;">3<a name="PB_3_024226_7056"></a></p>
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