Gran Tierra Energy Revises First Quarter 2010 Results Conference Call Date

CALGARY, May 6 /PRNewswire-FirstCall/ - Gran Tierra Energy Inc. (NYSE Amex: GTE, TSX: GTE), a company focused on oil exploration and production in South America, announced today that it now intends to release its financial and operating results on Monday, May 10, 2010 and host its first quarter 2010 results conference call on Wednesday, May 12, 2010 at 10 a.m. Eastern Time.

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.

To pre-register for this conference call, please visit:

https://www.theconferencingservice.com/prereg/key.process?key=PLBF9GRCA

Interested parties may access the conference call by dialing 1.888.713.4214 (domestic) or +1.617.213.4866 (international), pass code 70246238. 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 11:59 p.m. on May 19, 2010. To access the replay dial 1.888.286.8010 (domestic) or +1.617.801.6888 (international) pass code 29570075.

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 and Peru, and has opened a business development office in Rio de Janeiro, 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. Investor inquiries may be directed to [email protected] or (403) 265-3221.

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.