CALGARY, CANADA, March 27, 2007 - Gran Tierra Energy Inc. (GTRE.OB) 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, 2006 during a conference call scheduled for Thursday, March 29, 2007, at 11:00 a.m. Eastern. The company's financial results for the fourth quarter and year end are scheduled to be released earlier that day.

What: Gran Tierra Energy Inc.'s Fourth Quarter and Year End 2006 Results Conference Call

When: Thursday, March 29, 2007, 11:00 a.m. Eastern

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

Dial-in Numbers: (866) 831-6272 (domestic) or 617-213-8859 (international), pass code # 16264446

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

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 April 5, 2007, by dialing (888) 286-8010 (domestic) or (617) 801-6888 (international) using confirmation pass code 39227504.

About Gran Tierra Energy, Inc.:

Gran Tierra Energy, Inc. is an international oil and gas exploration and production company, headquartered in Calgary, Canada, incorporated and traded in the United States and operating in South America. The Company holds interests in producing and prospective properties in Argentina, Colombia and Peru. To date, the Company has pursued a strategy that focuses on establishing a portfolio of producing properties, development and exploration opportunities, through selective acquisitions, to provide a base for future growth. Additional information concerning Gran Tierra is available at http://www.grantierra.com. Investor inquiries may be directed to [email protected] or 1-800-916-GTRE (4873).