FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Mottor Danielle S		 2. Issuer Name and Ticker or Trading Symbol

ATLANTIC POWER CORP [ AT ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

C/O ATLANTIC POWER CORPORATION, 3 ALLIED DRIVE, SUITE 155		 3. Date of Earliest Transaction (MM/DD/YYYY)

5/14/2021
(Street)

DEDHAM, MA 02026
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)		8. Price of Derivative Security
(Instr. 5)		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Deferred share units  (1)5/14/2021  D (2)    130622   (1) (1)Common shares 130622 $3.03 0 D  
Explanation of Responses:
(1) Represents previously reported awards of deferred share units ("DSUs") granted under the Deferred Share Unit Plan of Atlantic Power Corporation (the "Company"), which provide for the payment of all accrued DSUs to the reporting person following his or her termination as a director. Each DSU is equal to the economic equivalent of one share of Company common stock, no par value (each, a "Common Share").
(2) Pursuant to the terms of the Arrangement Agreement dated January 14, 2021 by and among the Company, Atlantic Power Preferred Equity Ltd., Atlantic Power Limited Partnership, Tidal Power Holdings Limited and Tidal Power Aggregator, LP, all outstanding awards of DSUs will be cancelled and each non-employee director holding such DSUs will be entitled to receive a cash payment from the Company equal to US$3.03 for each Common Share subject to his or her DSU awards, without interest and less any applicable withholding taxes.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Mottor Danielle S
C/O ATLANTIC POWER CORPORATION
3 ALLIED DRIVE, SUITE 155
DEDHAM, MA 02026		X
Signatures
/s/ John S. Miele, attorney-in-fact5/19/2021
**Signature of Reporting PersonDate
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