Company to Host Conference Call on November 8, 2007 at 11:00 a.m. Eastern Time

CALGARY, CANADA, November 5, 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 third quarter ended September 30, 2007 during a conference call scheduled for Thursday, November 8, 2007, at 11:00 a.m. Eastern Time. The company's financial results for the third quarter are scheduled to be released earlier that day.

What: Gran Tierra Energy Inc.'s Third Quarter 2007 Results Conference Call

When: Thursday, November 8, 2007, 11:00 a.m. Eastern

Web cast address:,

Dial-in Numbers: (800) 561-2813 (domestic) or (617) 614-3529 (international), pass code # 48159097

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 November 15, 2007, by dialing (888) 286-8010 (domestic) or (617) 801-6888 (international) using confirmation pass code 88448496. An audio replay of the call will also be available on Gran Tierra Energy's web site,, 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 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 Energy is available at Investor inquiries may be directed to [email protected] or 1-800-916-GTRE (4873).

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