Atlantic Power Corp. (AT)

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Atlantic Power Corporation Announces September 2012 Common Share Dividend

Atlantic Power Corporation (TSX: ATP) (NYSE: AT) (the "Company") today announced its distribution for the month of September 2012. A dividend of Cdn$0.09583 per common share will be payable on October 31, 2012 to holders of record at the close of business on September 28, 2012.

Dividend Reinvestment Plan

On August 8, 2012, Atlantic Power announced the details of the Company's Dividend Reinvestment Plan ("DRIP" or the "Plan"). The DRIP allows eligible holders of Common Shares to reinvest their cash dividends (if, as and when declared by the Company's board of directors and paid) to acquire additional Common Shares of Atlantic Power at a 3% discount to market price, as defined in the Plan.

All holders of Common Shares who are Canadian or U.S. residents are eligible to participate in the Plan. Shareholders who wish to participate in the DRIP should contact their brokerage firm to enroll in the Plan.

A complete copy of the DRIP and enrollment information is available in the "Investors" section of the Company's website www.atlanticpower.com or here. Shareholders are urged to carefully read the complete Plan before making any decisions regarding their participation in the DRIP.

Participation in the DRIP does not relieve shareholders of any liability for taxes that may be payable in respect of dividends that are reinvested in new Common Shares pursuant to the DRIP. Eligible shareholders interested in participating in the DRIP should consult their own tax advisors concerning the tax implications and consequences of their participation in the DRIP in their particular circumstances.