/C O R R E C T I O N from Source -- Gran Tierra Energy Inc./



    In c5432 transmitted at 11:17e, an error occurred in the sub-headline. It
    should have read "Company to Host Conference Call on August 14, 2007 at
    11:00 a.m. Eastern" and not "Company to Host Conference Call on
    August 10, 2007 at 11:00 a.m. Eastern". Corrected copy follows:

    Gran Tierra Energy to Announce Second Quarter 2007 Results of Operations

    Company to Host Conference Call on August 14, 2007 at 11:00 a.m. Eastern

    CALGARY, CANADA, August 9 /CNW/ - Gran Tierra Energy Inc. (OTC Bulletin
Board: GTRE) today announced that the Company's senior management will discuss
the company's results of operations for the second quarter ended June 30, 2007
during a conference call scheduled for Tuesday, August 14, 2007, at 11:00 a.m.
Eastern. 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 2007
                          Results Conference Call

    When:                 Tuesday, August 14, 2007, 11:00 a.m. Eastern

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

    Dial-in Numbers:      (800) 599-9816 (domestic) or
                          (617) 847-8705 (international),
                          pass code No. 64124577

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

    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 21, 2007, by dialing (888) 286-8010 (domestic) or (617)
801-6888 (international) using confirmation pass code 78933699. An audio
replay of the call will also be available on Gran Tierra'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 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
www.grantierra.com. Investor inquiries may be directed to info@grantierra.com
or 1-800-916-GTRE (4873).




For further information:

For further information: Gran Tierra Energy Inc., Dana Coffield, (800)
916-4873, President & Chief Executive Officer, info@grantierra.com; or Cameron
Associates, Al Palombo, (212) 245-8800, Ext. 209, Investor Relations,
al@cameronassoc.com

Organization Profile

Gran Tierra Energy Inc.

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