<SUBMISSION>
<ACCESSION-NUMBER>0001104659-21-075194
<TYPE>15-12B
<PUBLIC-DOCUMENT-COUNT>1
<FILING-DATE>20210602
<DATE-OF-FILING-DATE-CHANGE>20210601
<EFFECTIVENESS-DATE>20210602
<FILER>
<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>15-12B
<ACT>34
<FILE-NUMBER>001-34691
<FILM-NUMBER>21986902
</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>
</FILER>
<DOCUMENT>
<TYPE>15-12B
<SEQUENCE>1
<FILENAME>tm2118088d1_1512g.htm
<DESCRIPTION>15-12G
<TEXT>
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<!-- Field: Rule-Page --><DIV STYLE="margin-top: 0; margin-bottom: 0; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

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  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border: Black 1pt solid; text-align: center; font-size: 10pt">OMB APPROVAL</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 10%">&nbsp;</TD>
    <TD STYLE="width: 10%">&nbsp;</TD>
    <TD STYLE="width: 60%">&nbsp;</TD>
    <TD STYLE="padding-left: 1pt; border-left: Black 1pt solid; width: 10%; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; color: #231F20">OMB Number:</FONT></TD>
    <TD STYLE="border-right: Black 1pt solid; width: 10%; padding-right: 0; text-align: right; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; color: #231F20">3235-0167</FONT>&nbsp;&nbsp;&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><B>UNITED
STATES</B></TD>
    <TD STYLE="padding-left: 1pt; border-left: Black 1pt solid; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; color: #231F20">Expires:</FONT></TD>
    <TD STYLE="border-right: Black 1pt solid; padding-right: 1pt; padding-left: 0; text-align: right; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; color: #231F20">May 31, 2021</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><P STYLE="margin-top: 0; margin-bottom: 0"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>
                                   <P STYLE="margin-top: 0; margin-bottom: 0"><B>Washington, D.C. 20549</B></P></TD>
    <TD COLSPAN="2" STYLE="padding-left: 1pt; border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Estimated average burden hours per response . . . . . 1.50</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"></TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="padding-left: 4.5pt; text-align: right; font-size: 10pt">&nbsp;</TD></TR>
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<P STYLE="font: 14pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt; color: #231F20">FORM 15</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center; color: #231F20"><B>CERTIFICATION
AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION <BR>
12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE <BR>
REPORTS
UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.</B></P>

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  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right; color: #231F20">Commission File Number&nbsp;&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left; color: #231F20">001-34691</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20"></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left"><FONT STYLE="font-size: 14pt">Atlantic Power
    Corporation</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; color: #231F20">(Exact name of registrant as specified in its charter)</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20"></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif">3 Allied Drive, Suite 155, Dedham MA 02026</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif">(617)977-2400</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; color: #231F20">(Address, including zip code, and telephone number, including area code, of registrant&rsquo;s principal executive offices)</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 65%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 25%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20"></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif">Common Shares, no par value, and the associated Rights to Purchase Common Shares; 6.00% Series E Convertible Unsecured Convertible Debentures
due January 31, 2015</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; color: #231F20">(Title of each class of securities covered by this Form)</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20"></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center">None</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="3" STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; color: #231F20">(Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains)</TD></TR>
  </TABLE>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.25in; color: #231F20">Please place
an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:</P>

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    <TD STYLE="width: 25%; font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule
    12g-4(a)(1)&nbsp;</FONT></TD>
    <TD STYLE="width: 75%"><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</font></font></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule 12g-4(a)(2)&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</font></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule 12h-3(b)(1)(i)&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule 12h-3(b)(1)(ii)&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule 15d-6&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</font></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 1in; color: #231F20"><FONT STYLE="font-size: 10pt">Rule 15d-22(b)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</font></FONT></TD></TR>
  </TABLE>


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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 0.25in; color: #231F20; width: 53%">Approximate number of holders of record as of the certification or notice date:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; padding-left: 0; color: #231F20; width: 47%">As to Common Shares, 1; as to Convertible Debentures, 21</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD></TR>
  </TABLE>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.25in; color: #231F20">Pursuant
to the requirements of the Securities Exchange Act of 1934 <I>Atlantic Power Corporation</I> has caused this certification/notice to
be signed on its behalf by the undersigned duly authorized person.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 4%; color: #231F20">Date:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 30%; color: #231F20">May 27, 2021</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 5%; color: #231F20">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 60%; color: #231F20">/s/ James J. Moore, Jr</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">Name:</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20"> James J. Moore, Jr.</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">Title: </TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">President and Chief Executive Officer</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</TD></TR>
  </TABLE>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; color: #231F20">Instruction: This form is required
by Rules 12g-4, 12h-3, 15d-6 and 15d-22 of the General Rules and Regulations under the Securities Exchange Act of 1934. The registrant
shall file with the Commission three copies of Form 15, one of which shall be manually signed. It may be signed by an officer of the registrant,
by counsel or by any other duly authorized person. The name and title of the person signing the form shall be typed or printed under the
signature.</P>

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

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<TD STYLE="width: 18%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">SEC 2069 (08-11)</font></TD>
<TD STYLE="width: 67%; padding-left: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.</FONT> <FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: #231F20">&nbsp;</FONT></TD>
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