Gran Tierra Energy temporarily reduces production operations in Putumayo Basin of Colombia in response to pipeline disruption



    CALGARY, June 15 /CNW/ - Gran Tierra Energy Inc. (NYSE Amex:   GTE, TSX:
GTE), a company focused on oil exploration and production in South America,
today announced that it has temporarily reduced production operations in the
Putumayo basin in southern Colombia in response to a recent disruption to the
Ecopetrol-operated Trans Andean Pipeline west of Orito.
    "Since the onset of the disruption, Gran Tierra has been able to maintain
a production rate of 2,000 barrels of oil per day (BOPD) net after royalty,
and we expect to continue production at rates equal to or greater than this
level while Ecopetrol works to reestablish pipeline transportation of crude
from the Putumayo Basin," said Dana Coffield, President and Chief Executive
Officer of Gran Tierra Energy. "We expect oil transportation through the Trans
Andean Pipeline west of Orito to resume shortly."
    Production from Argentina continues to average approximately 900 BOPD net
after royalty.
    The suspension of production operations has had no impact on drilling
operations. Testing of Costayaco-7 has been initiated and the drilling of
Costayaco-8 is continuing. Both testing and drilling operations are expected
to be completed by the end of June.

    About Gran Tierra Energy Inc.

    Gran Tierra Energy Inc. is an international oil and gas exploration and
production company, headquartered in Calgary, Canada, incorporated in the
United States, trading on the NYSE Amex Exchange (GTE) and the Toronto Stock
Exchange (GTE), and operating in South America. Gran Tierra Energy holds
interests in producing and prospective properties in Argentina, Colombia and
Peru. Gran Tierra Energy has a strategy that focuses on establishing 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.

    Forward Looking Statements:

    The statements in this news release regarding Gran Tierra Energy's belief
that the company's production will be maintained at rates equal to or greater
than 2,000 BOPD net after royalty, its expectations regarding the timing of
resumed transportation on the Trans Andean Pipeline, and expected timing for
completion of testing of Costayaco-7 and completion of drilling on Costayaco-8
are forward looking statements or financial outlook ("forward-looking
statements") under the meaning of applicable securities laws, including
Canadian Securities Administrators' National Instrument 51-102 Continuous
Disclosure Obligations and the United States Private Securities Litigation
Reform Act of 1995. These statements are subject to risks, uncertainties and
other factors that could cause actual results or outcomes to differ materially
from those contemplated by the forward-looking statements. There are a number
of important factors that could cause the results or outcomes discussed herein
to differ materially from that indicated by the forward-looking statements,
including, among others: Gran Tierra Energy's operations are located in South
America, and unexpected problems can arise due to guerilla activity, technical
difficulties and operational difficulties which impact its testing and
drilling operations and the production, transport or sale of its products;
geographic, political and weather conditions can impact testing and drilling
operations and the production, transport or sale of its products; and the risk
that recent disruptions will continue longer than expected. Further
information on potential factors that could affect Gran Tierra Energy are
included in risks detailed from time to time in Gran Tierra Energy's
Securities and Exchange Commission filings, including, without limitation,
under the caption "Risk Factors" in Gran Tierra Energy's Quarterly Report on
Form 10-Q filed May 8, 2009. These filings are available on a Web site
maintained by the Securities and Exchange Commission at http://www.sec.gov and
on SEDAR at www.sedar.com. The forward-looking statements contained herein are
expressly qualified in their entirety by this cautionary statement. The
forward-looking statements included in this document are made as of the date
of this document and Gran Tierra Energy disclaims any intention or obligation
to update or revise any forward-looking statements, whether as a result of new
information, future events or otherwise, except as expressly required by
applicable securities legislation.





For further information:

For further information: For media and investor inquiries please contact
Thomas McMillan, Equicom Group, (866) 973-4873, (403) 536-5903,
info@grantierra.com.

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Gran Tierra Energy Inc.

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