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 *

D'Angelo James Patrick		 2. Issuer Name and Ticker or Trading Symbol

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

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

C/O 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
Common shares 5/14/2021  J(1)  168058 D$3.03 0 D  

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
Notional shares  (2)5/14/2021  D (3)    90879   (2) (2)Common shares 90879 $3.03 0 D  
Explanation of Responses:
(1) Pursuant to the terms of the Arrangement Agreement dated January 14, 2021 (the "Agreement") by and among Atlantic Power Corporation (the "Company"), Atlantic Power Preferred Equity Ltd. ("APPEL"), Atlantic Power Limited Partnership, Tidal Power Holdings Limited and Tidal Power Aggregator, LP (together with Tidal Power Holdings Limited, the "Purchasers"), the Purchasers purchased each share of Company common stock, no par value (each, a "Common Share") at a price per share of US$3.03, net to the seller in cash, without interest thereon and less any required withholding taxes.
(2) Represents previously reported awards of notional shares ("Notional Shares") granted under the Company's Long-Term Incentive Plans, which provide forsettlement of such Notional Shares upon vesting, which occurs ratably over a three year period or upon certain other events. Each Notional Share is equal to theeconomic equivalent of one Common Share.
(3) Pursuant to the terms of the Agreement, all outstanding awards of Notional Shares will vest in full and be cancelled and each person holding such Notional Shareswill be entitled to receive a cash payment from the Company equal to US$3.03 for each Common Share subject to his or her Notional Share awards, withoutinterest and less any applicable withholding taxes.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
D'Angelo James Patrick
C/O 3 ALLIED DRIVE
SUITE 155
DEDHAM, MA 02026

Chief Administrative Officer
Signatures
/s/ John S. Miele, attorney-in-fact5/19/2021
**Signature of Reporting PersonDate
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