6 August 2008

Gran Tierra Energy to Announce Second Quarter 2008 Results of Operations

Company to Host Conference Call on August 11, 2008 at 11:00 a.m. Eastern Time

CALGARY, CANADA, August 6, 2008 – Gran Tierra Energy Inc. (AMEX: GTE, TSX: GTE) today announced that the company’s senior management will discuss the company’s results of operations for the second quarter ended June 30, 2008 during a conference call scheduled for Monday, August 11, 2008, at 11:00 a.m. Eastern Time.  The company’s financial results for the second quarter are scheduled to be released earlier that day.

What:                           Gran Tierra Energy Inc.’s Second Quarter Results of Operations Conference Call

When:                           Monday, August 11, 2008, 11:00 a.m. Eastern

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

Dial-in Numbers:           (888) 713-4213 (domestic) or (617) 213-4865 (international),                                                               pass code # 37148965

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 August 18, 2008, by dialing (888286-8010 (domestic) or (617801-6888 (international) using confirmation pass code 71727488. 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 operating in South America, headquartered in Calgary, Canada, incorporated in the United States, and trading on the American Stock Exchange (GTE) and the Toronto Stock Exchange (GTE). The company holds interests in producing and prospective properties in Argentina, Colombia and Peru. The company has a strategy that focuses on growing 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).