Gran Tierra Energy To Host Second Quarter 2011 Results Conference Call On August 9, 2011 At 8:00 A.M. Mountain Time

CALGARY, Aug. 2, 2011 /PRNewswire/ - Gran Tierra Energy Inc. (NYSE AMEX: GTE; TSX: GTE) (" Gran Tierra Energy") , a company focused on oil and gas exploration and production in South America, announced today that it plans to release its financial and operating results the evening of Monday, August 8, 2011 and host its second quarter 2011 results conference call on Tuesday, August 9, 2011 at 8:00 a.m. Mountain Time (MT).

President and CEO, Dana Coffield, CFO, Martin Eden and COO, Shane O'Leary will discuss Gran Tierra Energy's financial and operating results for the quarter and then take questions from securities analysts and institutional shareholders.

Interested parties may access the conference call by dialing 1-866-804-6928 (domestic) or 1-857-350-1674 (international), pass code 75075915. The call will also be available via web cast at www.grantierra.com, www.streetevents.com, or www.fulldisclosure.com. The web cast will be available on Gran Tierra Energy's website until the next earnings call.

If you are unable to participate, an audio replay of the call will be available beginning two hours after the call until 1:00 p.m. on August 23, 2011.  To access the replay dial 1-888-286-8010 (domestic) or [phone] (international) pass code 21135132.

Please connect at least 15 minutes prior to the conference call to ensure adequate time for any software to download that may be required to join the webcast.

About Gran Tierra Energy Inc.

Gran Tierra Energy Inc. is an international oil and gas exploration and production company, headquartered in Calgary, Canada, incorporated in the United States, trading on the NYSE Amex Exchange (GTE) and the Toronto Stock Exchange (GTE), and operating in South America. Gran Tierra Energy holds interests in producing and prospective properties in Argentina, Colombia, Peru and Brazil. Gran Tierra Energy has a strategy that focuses on establishing a portfolio of producing properties, plus production enhancement and exploration opportunities to provide a base for future growth. Additional information concerning Gran Tierra Energy is available at www.grantierra.com.

Gran Tierra Energy's Securities and Exchange Commission filings are available on a web site maintained by the Securities and Exchange Commission at http://www.sec.gov and on SEDAR at http://www.sedar.com.

SOURCE Gran Tierra Energy Inc.

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