Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Welch Barry Edward
 2. Date of Event Requiring Statement (Month/Day/Year)
07/22/2010		 3. Issuer Name and Ticker or Trading Symbol
ATLANTIC POWER CORP [AT]
(Last)
(First)
(Middle)
C/O ATLANTIC POWER CORPORATION, 200 CLARENDON ST., FLOOR 25		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02116		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Share 158,196
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Notional Unit   (1)   (1) Common Share 222,203 $ (2) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Welch Barry Edward
C/O ATLANTIC POWER CORPORATION
200 CLARENDON ST., FLOOR 25
BOSTON, MA 02116		   X     President and CEO  

Signatures

/s/ Patrick J. Welch, attorney-in-fact 07/23/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The notional units vest under the terms of the Company's Long-Term Incentive Plan over a maximum of three years.
(2) Each notional unit represents a contingent right to receive one common share (by election of the undersigned), one-third in cash and the remainder in common shares, or, at the discretion of the board of directors of the issuer, cash only.
 
Remarks:
Exhibit List: Exhibit 24 - Power of Attorney

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