BOSTON--(BUSINESS WIRE)-- Atlantic Power Corporation (NYSE: AT) (TSX: ATP) (“Atlantic Power”) will release its financial results for the three months ended March 31, 2011 on the afternoon of Wednesday, May 11, 2011. A telephone conference call hosted by Atlantic Power’s management team will be held:

Thursday, May 12, 2011 at 10.00 am ET

The telephone numbers for the conference call are:

Local / International: (416) 849-2698North American Toll Free: (866) 400-2270

The Conference Call will also be broadcast over Atlantic Power’s website at www.atlanticpower.com. Please call or log in 10 minutes prior to the call.

Replay/Archive

The telephone numbers to listen to the conference call after it is completed (Instant Replay) are local (416) 915-1035 or toll free (866) 245-6755. Please enter the passcode 377980# when instructed. The conference call will also be archived on Atlantic Power’s web site.

About Atlantic Power

Atlantic Power Corporation owns and operates a diverse fleet of power generation and infrastructure assets in the United States. We sell electricity to utilities and other large commercial customers under long-term power purchase agreements, which seek to minimize exposure to changes in commodity prices. Our corporate strategy is to generate stable cash flows from our existing assets and to make accretive acquisitions to sustain our dividend payout to shareholders, which is currently paid monthly at an annual rate of Cdn$1.094 per share. Our current portfolio consists of interests in 13 operational power generation projects across ten states, one biomass project under construction in Georgia, and a 500 kilovolt 84-mile electric transmission line located in California. Atlantic Power also owns a majority interest in Rollcast Energy, a biomass power plant developer with several projects under development. Our power generation projects in operation have an aggregate gross electric generation capacity of approximately 1,962 megawatts in which our ownership interest is approximately 878 MW.

Atlantic Power trades on the New York Stock Exchange under the symbol AT, on the Toronto Stock Exchange under the symbol ATP and has a market capitalization of approximately $1.0 billion.

Source: Atlantic Power Corporation

For more information, please visit the Company’s website at www.atlanticpower.com or contact:

Atlantic Power Corporation

Patrick Welch, 617-977-2700

Chief Financial Officer

info@atlanticpower.com