TORONTO, ONTARIO--(Marketwire - May 14, 2010) - Atlantic Power Corporation (TSX:ATP) (the "Company") today announced its distribution for the month of May 2010. A dividend of Cdn$0.0912 per common share will be payable on June 30, 2010 to holders of record at the close of business on May 31, 2010.

Tax Information for Shareholders

Atlantic Power Corporation designates this dividend to be an "eligible dividend" pursuant to subsection 89(14) of the Income Tax Act (Canada) and its equivalent in any provinces of Canada.

U.S. individual or other non-corporate taxpayers should be eligible for the reduced rate of tax currently applicable to "qualified dividends" provided that the investor meets the holding period and any other requirements.

The Company's common share dividend is subject to a 15% withholding tax for U.S. holders. U.S. individuals holding shares in taxable accounts may be eligible to receive a credit on their U.S. income tax return for this withholding tax. U.S. individuals holding the Company's common shares in Individual Retirement Accounts ("IRAs") may be exempt from withholding tax pursuant to the Canada - U.S. Income Tax Convention.

Taxpayers should always seek their own independent qualified professionals regarding the tax consequences of purchasing or owning common shares of the Company. Individuals who believe the withholding tax exemption applies to their IRA should contact their broker to determine how to claim the exemption.

About Atlantic Power

Atlantic Power Corporation is an independent power producer that owns interests in a diversified fleet of power generation and transmission projects located in the United States. Atlantic Power's objectives are to maintain the stability of dividends to its shareholders and to increase the long term value of the Company by enhancing the performance of its existing assets and by making accretive acquisitions.

FOR FURTHER INFORMATION PLEASE CONTACT:
        Atlantic Power Corporation
        Patrick Welch
        (617) 977-2700
        info@atlanticpower.com

Source: Atlantic Power Corporation