8 February 2011

Gran Tierra Energy Announces 2010 Year-End Reserves

CALGARY, Alberta – February 8, 2011 – Gran Tierra Energy Inc. (NYSE Amex: GTE; TSX: GTE) (“Gran Tierra Energy”), a company focused on oil exploration and production in South America, today announced the results of an independent reserve evaluation of the company’s reserves by GLJ Petroleum Consultants Ltd. effective December 31, 2010.
Year-end 2010 Highlights (net after royalties (“NAR”), calculated in accordance with Securities and Exchange Commission (“SEC”) rules):

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