Gran Tierra Energy Resumes Regular Production Operations in the Putumayo Basin, Colombia

    Current Colombia Production Averaging 18,000 Barrels of Oil per Day Net
    After Royalty

    CALGARY, Aug. 18 /CNW/ - Gran Tierra Energy Inc. (AMEX:   GTE; TSX: GTE), a
company focused on oil exploration and production in South America, today
announced that it has resumed regular production operations in the Putumayo
Basin of Southern Colombia.
    Crude oil transportation operations on the Ecopetrol-operated Trans
Andean Pipeline resumed on August 10, 2009. Gran Tierra Energy subsequently
restored production in Colombia over several days and is currently averaging
approximately 21,770 barrels of oil per day (BOPD) gross, or 18,000 BOPD net
after royalty. During the 32 days of reduced production due to pipeline
repairs, from July 10, 2009 to August 10, 2009, oil production averaged
approximately 6,500 BOPD gross. Over the same period oil sales averaged 3,440
BOPD net after royalty.
    Additional royalties are expected for the Costayaco field once cumulative
production reaches five million barrels of oil late in the third quarter of
2009. With these additional royalties taken into account, Gran Tierra Energy
remains on track to produce at its previously announced rate of 14,000 to
16,000 BOPD net after royalty in the fourth quarter of this year.
    Production sales in Argentina averaged approximately 950 BOPD net after
royalty from July 10, 2009 to August 10, 2009, and are approximately at this
same level now.

    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

    Forward-Looking Statements:

    The statements in this news release regarding Gran Tierra Energy's belief
with respect to expected royalties and that it is on track to achieve 14,000
to 16,000 BOPD net after royalty production in the fourth quarter of this year
are forward-looking statements or financial outlook (collectively,
"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,
including, among others: Gran Tierra Energy's operations are located in South
America, and unexpected problems can arise due to guerrilla 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 the current global economic and credit crisis may impact oil prices and
oil consumption more than Gran Tierra Energy currently predicts, which could
cause Gran Tierra Energy to modify its production activities. 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 August 10, 2009. These filings are available on a Web site
maintained by the Securities and Exchange Commission at and
on SEDAR at The forward-looking statements contained herein are
expressly qualified in their entirety by this cautionary statement. The
forward-looking statements included in this press release are made as of the
date of this press release 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, 1-866-973-4873, (403) 536-5903,

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Gran Tierra Energy Inc.

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