Item 4.01.              Change in Registrant’s Certifying Accountant

Since the time of Atlantic Power Corporation’s (the “Company”) initial public offering on the Toronto Stock Exchange in 2004, the Canadian firm of KPMG LLP, Chartered Accountants (“ KPMG Canada ”) has served as the Company’s independent public accounting firm.  In April 2010, the Company filed an initial registration statement on Form 10 with the United States Securities and Exchange Commission. The registration statement was declared effective on July 21, 2010 and the Company’s common shares began trading on the New York Stock Exchange on July 23, 2010. Beginning with the first quarter of 2010, the Company commenced reporting under United States generally accepted accounting principles (“GAAP”) , rather than Canadian GAAP as in prior periods.

In connection with these events, on August 4, 2010, the audit committee of the Company’s Board of Directors authorized the appointment of the United States firm of KPMG LLP (“ KPMG US ”) as the Company’s independent registered public accounting firm for the fiscal year 2010 year-end audit.  KPMG Canada’s tenure as the Company’s independent public accounting firm will lapse at the conclusion of the fiscal year 2010 second quarter review.

The audit report of KPMG Canada on the consolidated financial statements of the Company prepared in accordance with United States GAAP as of and for the years ended December 31, 2009 and 2008, as included in the Company’s registration statement on Form 10 filed with the Securities and Exchange Commission on July 21, 2010, did not contain any adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope, or accounting principles, except that the audit report indicated that, as discussed in note 2 to the consolidated financial statements, (i) on January 1, 2009, the Company adopted FASB’s ASC 805 Business Combinations, (ii) on January 1, 2008, the Company changed its method of accounting for fair value measurements in accordance with FASB ASC 820 Fair Value Measurements, and (iii) on January 1, 2007, the Company changed its method of accounting for income tax uncertainties in accordance with guidance provided in FASB ASC 740 Income Taxes.

During the fiscal years ended December 31, 2009 and 2008, and in the interim period from January 1, 2010 through August 4, 2010, there were no disagreements between the Company and KPMG Canada on any matter of accounting principles or practices, financial statement disclosure, or audit scope or procedure, which disagreements, if not resolved to the satisfaction of KPMG Canada, would have caused it to make reference thereto in connection with their report.  Additionally, during this time frame there were no “reportable events” as defined in Item 304(a)(1)(v) of Regulation S-K.

The Company provided KPMG Canada with a copy of the foregoing disclosure.  The Company has requested and received a latter from KPMG Canada, addressed to the Securities and Exchange Commission, stating whether it agrees with the above statements.  A copy of the letter, dated August 10, 2010 is filed as Exhibit 16.1 to this Current Report on Form 8-K.

During the years ended December 31, 2009 and 2008 and for the period beginning January 1, 2010 and ending August 4, 2010, neither the Company nor anyone acting on its behalf consulted KPMG US with respect to either (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s consolidated financial statements, and no written report or oral advice was provided by KPMG US to the Company that KPMG US concluded was an important factor considered by the Company in reaching a decision as to the accounting, auditing or financial reporting issue, or (ii) any matter that was either the subject of a disagreement (as defined in Item 304(a)(1)(iv) of Regulation S-K and the related instructions to that Item) or a reportable event (as described in Item 304(a)(1)(v) of Regulation S-K).