11 March 2008

Gran Tierra Energy to Announce Fourth Quarter and Year End 2007 Results of Operations

Company to Host Conference Call on March 14, 2008 at 10:00 a.m. Eastern Time

CALGARY, CANADA, March 11, 2008 – Gran Tierra Energy Inc. (TSX: GTE, OTCBB:GTRE) today announced that the company’s senior management will discuss the company’s results of operations for the fourth quarter and year ended December 31, 2007 during a conference call scheduled for Friday, March 14, 2008, at 10:00 a.m. Eastern Time. The company’s financial results for the fourth quarter and year 2007 year end are scheduled to be released earlier that day.

What: Gran Tierra Energy Inc.’s Fourth Quarter and Year End 2007 Results of Operations Conference Call

When: Friday, March 14, 2008, 10:00 a.m. Eastern

Web cast address: http://www.streetevents.comhttp://www.fulldisclosure.com

Dial-in Numbers: (888) 680-0879 (domestic) or (617) 213-4856 (international), pass code # 45103243

Contact: Al Palombo, Cameron Associates, (212) 245-8800 Ext. 209,


Participants may pre-register for the call at:


Pre-registrants will be issued a pin number to use when dialing into the live call which will provide quick access to the conference by bypassing the operator upon connection.

If you are unable to participate, an audio replay of the call will be available beginning two hours after the call and will be available until 11:59 p.m. on March 21, 2008, by dialing (888286-8010 (domestic) or (617801-6888 (international) using confirmation pass code 18215037. An audio replay of the call will also be available on Gran Tierra Energy’s web site, www.grantierra.com, until the next earnings call.

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 Toronto Stock Exchange (GTE) and the OTC Bulletin Board (GTRE), and operating in South America. The company holds interests in producing and prospective properties in Argentina, Colombia and Peru. The company 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 info@grantierra.com or 1-800-916-GTRE (4873).