Gran Tierra Energy Announces Filing of NI 51-101 Reserves Disclosures

    CALGARY, Alberta, Feb. 27 /CNW/ -- Gran Tierra Energy Inc. (NYSE
Alternext: GTE, TSX: GTE), a company focused on oil exploration and production
in South America, today announced it has filed information regarding the
company's crude oil and natural gas reserves for the year ended December 31,
2008 in accordance with the requirements of Canadian Securities
Administrators' National Instrument 51-101 Standards of Disclosure for Oil and
Gas Activities.

    Gran Tierra Energy's Statement of Reserves Data and Other Oil and Gas
Information Form NI 51-101 F1; Report on Reserves Data by Independent
Evaluator Form 51-101 F2; and Report of Management and Directors on Reserves
Data and Other Information Form 51-101 F3; are now accessible on

    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 NYSE Alternext
(GTE) and the Toronto Stock Exchange (GTE). The company holds interests in
producing and prospective properties in Colombia, Argentina, 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 Investor inquiries may be
directed to or 1-800-916-GTRE (4873).

    Gran Tierra Energy's Securities and Exchange Commission filings are
available on a Web site maintained by the Securities and Exchange Commission
at and on SEDAR at



    Dana Coffield                                     Al Palombo
    Gran Tierra Energy Inc.                           Cameron Associates
    President & Chief Executive Officer               Investor Relations
    (866) 973-4873                                    (212) 245-8800 Ext. 209                     


For further information:

For further information: Dana Coffield, President & Chief Executive
Officer of Gran Tierra Energy Inc., 1-866-973-4873,; or Al
Palombo, Investor Relations of Cameron Associates, +1-212-245-8800, ext. 209,, for Gran Tierra Energy Inc. Web Site:

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Gran Tierra Energy Inc.

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