Gran Tierra Energy Announces 2009 Year-End Reserves

Another Record Year for Proved Oil and Gas Reserves

CALGARY, Feb. 22 /CNW/ - Gran Tierra Energy Inc. (NYSE Amex: GTE; TSX: GTE), a company focused on oil exploration and production in South America, today announced the results of an independent reserve evaluation of the company's reserves by GLJ Petroleum Consultants Ltd. effective December 31, 2009.

Year-end 2009 Highlights (net after royalties):

    
    -  Approximately 5.7 million barrels of working interest oil was produced
       in 2009;
    -  Proved oil reserves increased 14.6 % to approximately 22.1 million
       barrels (SEC compliant);
    -  Proved plus probable (2P) oil reserves are approximately 27.9 million
       barrels (no SEC equivalent in 2008);
    -  Proved plus probable plus possible (3P) oil reserves are approximately
       39.4 million barrels (no SEC equivalent in 2008);
    -  Approximately 0.1 billion cubic feet of working interest gas was
       produced in 2009;
    -  Proved gas reserves increased 61.0 % to approximately 1.9 billion
       cubic feet (SEC compliant);
    -  Proved plus probable (2P) gas reserves are approximately 3.6 billion
       cubic feet (no SEC equivalent in 2008);
    -  Proved plus probable plus possible (3P) gas reserves are approximately
       38.1 billion cubic feet (no SEC equivalent in 2008).
    

All reserves values contained in the 2009 Highlights, provided above, have been calculated using United States Securities Exchange Commission rules. For reserves values calculated in compliance with Canadian National Instrument 51-101 and the Canadian Oil and Gas Evaluation Handbook, see "Reserves Reported in Accordance with Canadian Reporting Requirements" below in this press release.

"2009 was another excellent year for the growth of Gran Tierra Energy's reserve base, fueled in large part by development drilling in the Costayaco Field in Colombia and testing operations in the Valle Morado Field in Argentina," said Dana Coffield, President and CEO. "The focus for 2010 is to grow reserves through an active exploration drilling campaign, with seven exploration wells budgeted in Colombia and four exploration wells budgeted in Peru. In addition, drilling and seismic operations are budgeted to further define the gas potential of our lands in Argentina. We expect this to be funded out of available cash and cashflow from operations, allowing the company to remain debt free."

    
    Reserves Reported in Accordance with United States Reporting Requirements
    -------------------------------------------------------------------------
    

The following reserves are reported consistent with United States Securities and Exchange Commission rules.

The following table summarizes Gran Tierra Energy's year-end 2009 working interest reserves and net after royalty reserves (with start of month average 2009 oil price). Also shown in the following table are Gran Tierra Energy's net after royalty reserves for year-end 2008 (with constant December 31, 2008 oil price and cost).

    
    Total Company

    -------------------------------------------------------------------------
    Total Company               2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest      NAR*           NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                MBO(xx)            MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing            26,606          20,375           8,966
    -------------------------------------------------------------------------
      Developed Nonproducing          1,032             899           1,300
    -------------------------------------------------------------------------
      Undeveloped                     1,037             808           8,972
    -------------------------------------------------------------------------
    Total Proved                     28,675          22,082          19,238
    -------------------------------------------------------------------------
    Total Probable                    7,543           5,821             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable       36,218          27,902             N/A
    -------------------------------------------------------------------------
    Total Possible                   15,093          11,538             N/A
    -------------------------------------------------------------------------
    Total PPP                        51,130          39,440             N/A
    -------------------------------------------------------------------------

    * NAR (net after royalty).
    (xx) MBO (thousand barrels of oil).

    -  The increases in proved oil reserves is mainly associated with
       development drilling in the Costayaco Field in Colombia.

    -------------------------------------------------------------------------
    Total Company               2009 Year-End   2009 Year-End   2008 Year-End

    Gas                          Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category             MMSCF(xxx)          MMSCF           MMSCF
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing             1,391           1,113           1,161
    -------------------------------------------------------------------------
      Developed Nonproducing            877             756               0
    -------------------------------------------------------------------------
      Undeveloped                         0               0               0
    -------------------------------------------------------------------------
    Total Proved                      2,268           1,869           1,161
    -------------------------------------------------------------------------
    Total Probable                    2,076           1,739             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable        4,344           3,608             N/A
    -------------------------------------------------------------------------
    Total Possible                   40,171          34,520             N/A
    -------------------------------------------------------------------------
    Total PPP                        44,515          38,128             N/A
    -------------------------------------------------------------------------

    (xxx) MMSCF (million standard cubic feet).

    -  The increase in proved gas reserves is due to workover activity on
       VM.x-1001 in the Valle Morado Field in Argentina.

    Colombia

    Gran Tierra Energy's Colombia year-end 2009 working interest and net after
royalty reserves are shown in the following table (with start of month average
2009 oil price). Also shown in the following table is Gran Tierra Energy's
Colombian net after royalty reserves for year-end 2008 (with constant December
31, 2008 oil price and cost).

    -------------------------------------------------------------------------
    Colombia                    2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing            25,427          19,350           7,832
    -------------------------------------------------------------------------
      Developed Nonproducing            968             844           1,061
    -------------------------------------------------------------------------
      Undeveloped                       794             597           8,788
    -------------------------------------------------------------------------
    Total Proved                     27,189          20,791          17,681
    -------------------------------------------------------------------------
    Total Probable                    6,564           4,972             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable       33,754          25,762             N/A
    -------------------------------------------------------------------------
    Total Possible                   12,496           9,430             N/A
    -------------------------------------------------------------------------
    Total PPP                        46,250          35,192             N/A
    -------------------------------------------------------------------------

    -  The increase in proved reserves in Colombia is mainly associated with
       development drilling in the Costayaco Field.

    -------------------------------------------------------------------------
    Colombia                    2009 Year-End   2009 Year-End   2008 Year-End

    Gas                          Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                 MMSCF           MMSCF           MMSCF
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing             1,391           1,113           1,161
    -------------------------------------------------------------------------
      Developed Nonproducing              0               0               0
    -------------------------------------------------------------------------
      Undeveloped                         0               0               0
    -------------------------------------------------------------------------
    Total Proved                      1,391           1,113           1,161
    -------------------------------------------------------------------------
    Total Probable                      815             652             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable        2,206           1,765             N/A
    -------------------------------------------------------------------------
    Total Possible                    1,735           1,388             N/A
    -------------------------------------------------------------------------
    Total PPP                         3,941           3,153             N/A
    -------------------------------------------------------------------------

    The Costayaco Field 2009 year-end net after royalty reserves are shown in
the following table (with start of month average 2009 oil price). Also shown
in the following table is a comparison of the Costayaco Field 2009 year-end
gross lease reserves (with start of the month average 2009 oil price) to the
gross lease reserves estimated in July 31, 2009 (with constant July 31, 2009
oil price and cost).

    -------------------------------------------------------------------------
    Costayaco                   2009 Year-End   2009 Year-End   July 31, 2009

    Light and Medium Oil          Costayaco       Costayaco       Costayaco
                                 Gran Tierra        Gross           Gross
                                    Energy          Lease           Lease
                                      NAR          Reserves        Reserves
    (SEC Compliant)                Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing            18,151          24,016           9,546
    -------------------------------------------------------------------------
    Total Proved                     18,748          24,810          19,657
    -------------------------------------------------------------------------
    Total Probable                    4,592           6,133             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable       23,340          30,943             N/A
    -------------------------------------------------------------------------
    Total Possible                    8,745          11,718             N/A
    -------------------------------------------------------------------------
    Total PPP                        32,085          42,661             N/A
    -------------------------------------------------------------------------

    Argentina

    Gran Tierra Energy's Argentina working interest and net after royalty
reserves are shown in the following table (with start of month average 2009
oil price). Also shown in the following table is Gran Tierra Energy's
Argentina net after royalty reserves for year-end 2008 (with constant December
31, 2008 oil price and cost).

    -------------------------------------------------------------------------
    Argentina                   2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing             1,179           1,025           1,134
    -------------------------------------------------------------------------
      Developed Nonproducing             64              55             239
    -------------------------------------------------------------------------
      Undeveloped                       243             211             184
    -------------------------------------------------------------------------
    Total Proved                      1,486           1,291           1,557
    -------------------------------------------------------------------------
    Total Probable                      978             850             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable        2,464           2,140             N/A
    -------------------------------------------------------------------------
    Total Possible                    2,416           2,109             N/A
    -------------------------------------------------------------------------
    Total PPP                         4,879           4,248             N/A
    -------------------------------------------------------------------------

    -  The decrease in proved oil reserves is due to production.

    -------------------------------------------------------------------------
    Argentina                   2009 Year-End   2009 Year-End   2008 Year-End

    Gas                          Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (SEC Compliant)                Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                 MMSCF           MMSCF           MMSCF
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing                 0               0               0
    -------------------------------------------------------------------------
      Developed Nonproducing            877             756               0
    -------------------------------------------------------------------------
      Undeveloped                         0               0               0
    -------------------------------------------------------------------------
    Total Proved                        877             756               0
    -------------------------------------------------------------------------
    Total Probable                    1,261           1,087             N/A
    -------------------------------------------------------------------------
    Total Proved plus Probable        2,138           1,843             N/A
    -------------------------------------------------------------------------
    Total Possible                   38,436          33,132             N/A
    -------------------------------------------------------------------------
    Total PPP                        40,574          34,975             N/A
    -------------------------------------------------------------------------

    -  The increase in proved gas reserves is due to workover activity on
       VM.x-1001 in the Valle Morado Field in Argentina.


    Reserves Reported in Accordance with Canadian Reporting Requirements
    --------------------------------------------------------------------
    

The following reserves are compliant with Canadian National Instrument 51-101 (NI 51-101) and the Canadian Oil and Gas Evaluation Handbook (COGEH) (with forecasted oil price and costs):

Total Company

    
    -------------------------------------------------------------------------
    Total Company               2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (NI 51-101 compliant)          Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing             26,942         19,705           9,194
    -------------------------------------------------------------------------
      Developed Nonproducing           1,032            898           1,329
    -------------------------------------------------------------------------
      Undeveloped                      1,051            784           8,289
    -------------------------------------------------------------------------
    Total Proved                      29,025         21,386          18,811
    -------------------------------------------------------------------------
    Total Probable                     7,304          5,410           8,676
    -------------------------------------------------------------------------
    Total Proved plus Probable        36,329         26,795          27,487
    -------------------------------------------------------------------------
    Total Possible                    14,915         11,085          18,599
    -------------------------------------------------------------------------
    Total PPP                         51,243         37,880          46,086
    -------------------------------------------------------------------------

    Gran Tierra Energy's year-end 2009 NAR reserves compared to year-end 2008
NAR reserves (compliant with NI 51-101 and COGEH) are as follows:

    -  Proved light and medium oil reserves increased 13.5% due to
       development drilling in the Costayaco Field in Colombia.

    -  In addition, Gran Tierra Energy also has year-end 2009 NAR proved gas
       reserves of approximately 1.9 billion cubic feet (BCF), an increase
       of 61.0 % from 1.2 BCF NAR proved gas reserves at year-end 2008 due
       to testing results in the Valle Morado Field in Argentina.

    -  Probable light and medium oil reserves decreased 38% due to changes
       in reserve category allocation.

    -  In addition, Gran Tierra Energy also has year-end 2009 NAR probable
       gas reserves of approximately 1.7 BCF, a decrease of 5.6% from 1.8 BCF
       NAR at year-end 2008.

    -  Possible light and medium oil reserves decreased 41.5% due to negative
       test results of Costayaco-7.

    -  In addition, Gran Tierra Energy also has year-end 2009 NAR possible
       gas reserves of approximately 34.5 BCF, an increase of 108% from
       16.6 BCF NAR at year-end 2008 due to testing results in the Valle
       Morado Field in Argentina.
    

Colombia

Gran Tierra Energy's year-end 2009 Colombia working interest and net after royalty reserves are shown in the following table (NI 51-101 compliant with forecast oil price and cost). Also shown in the following table are Gran Tierra Energy's Colombian net after royalty reserves for year-end 2008 (NI 51-101 compliant with forecast oil price and cost).

    
    -------------------------------------------------------------------------
    Colombia                    2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (NI 51-101 compliant)          Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing            25,725          18,647           8,050
    -------------------------------------------------------------------------
      Developed Nonproducing            968             843           1,080
    -------------------------------------------------------------------------
      Undeveloped                       822             585           8,108
    -------------------------------------------------------------------------
    Total Proved                     27,515          20,075          17,237
    -------------------------------------------------------------------------
    Total Probable                    6,322           4,557           7,706
    -------------------------------------------------------------------------
    Total Proved plus Probable       33,837          24,632          24,943
    -------------------------------------------------------------------------
    Total Possible                   12,503           8,980          15,806
    -------------------------------------------------------------------------
    Total PPP                        46,340          33,611          40,749
    -------------------------------------------------------------------------

    -  The increases in proved reserves in Colombia is mainly associated
       with development drilling in the Costayaco Field. The decrease in
       possible reserves is due primarily to the negative test results from
       Costayaco-7.

    -  In addition to the above proved light and medium oil reserves, Gran
       Tierra Energy also has year-end 2009 NAR proved gas reserves of
       approximately 1.1 BCF in Colombia. Gran Tierra Energy had 1.2 BCF
       proved gas reserves at year-end 2008 in Colombia.

    -  In addition to the above probable light and medium oil reserves, Gran
       Tierra Energy also has year-end 2009 NAR probable gas reserves of
       approximately 0.7 BCF in Colombia. Gran Tierra Energy had 0.7 BCF NAR
       probable gas reserves at year-end 2008 in Colombia.

    -  In addition to the above possible light and medium oil reserves, Gran
       Tierra Energy also has year-end 2009 NAR possible gas reserves of
       approximately 1.4 BCF in Colombia. Gran Tierra Energy had 1.9 BCF NAR
       possible gas reserves at year-end 2008 in Colombia.
    

The Costayaco Field 2009 year-end net after royalty reserves are shown in the following table (with forecast oil price and cost). Also shown in the following table is a comparison of the Costayaco Field 2009 year-end gross lease reserves (with forecast oil price and cost) to the gross lease reserves estimated in July 31, 2009 (with forecast oil price and cost).

    
    -------------------------------------------------------------------------
    Costayaco                   2009 Year-End   2009 Year-End   July 31, 2009

    Light and Medium Oil          Costayaco       Costayaco       Costayaco
                                 Gran Tierra        Gross           Gross
                                    Energy          Lease           Lease
                                      NAR          Reserves        Reserves
    (NI 51-101 compliant)          Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing            17,398          24,257           9,800
    -------------------------------------------------------------------------
    Total Proved                     17,983          25,079          19,657
    -------------------------------------------------------------------------
    Total Probable                    4,153           5,864          10,635
    -------------------------------------------------------------------------
    Total Proved plus Probable       22,136          30,943          30,292
    -------------------------------------------------------------------------
    Total Possible                    8,290          11,718          13,217
    -------------------------------------------------------------------------
    Total PPP                        30,426          42,661          43,509
    -------------------------------------------------------------------------
    

Approximately 2.64 million barrels of oil (MMBO) was produced from August 1, 2009 to December 31, 2009. Taking the production volume into account, there is an increase in proved and probable reserves associated with the successful drilling and testing of Costayaco-8, Costayaco-9 and Costayaco-10. The reductions in possible reserves are mainly associated with the failure to test oil in Costayaco-7.

Argentina

Gran Tierra Energy's Argentina year-end 2009 working interest and net after royalty reserves are shown in the following table (NI 51-101 compliant with forecast oil price and cost). Also shown in the following table is Gran Tierra Energy's Argentina net after royalty reserves for year-end 2008 (NI 51-101 compliant with forecast oil price and cost).

    
    -------------------------------------------------------------------------
    Argentina                   2009 Year-End   2009 Year-End   2008 Year-End

    Light and Medium Oil         Gran Tierra     Gran Tierra     Gran Tierra
                                    Energy          Energy          Energy
                               Working Interest       NAR             NAR
    (NI 51-101 compliant)          Reserves        Reserves        Reserves
    -------------------------------------------------------------------------
    Reserves Category                   MBO             MBO             MBO
    -------------------------------------------------------------------------
    Proved
    -------------------------------------------------------------------------
      Developed Producing             1,217           1,058           1,144
    -------------------------------------------------------------------------
      Developed Nonproducing             64              55             249
    -------------------------------------------------------------------------
      Undeveloped                       229             199             181
    -------------------------------------------------------------------------
    Total Proved                      1,510           1,311           1,574
    -------------------------------------------------------------------------
    Total Probable                      982             853             970
    -------------------------------------------------------------------------
    Total Proved plus Probable        2,492           2,164           2,544
    -------------------------------------------------------------------------
    Total Possible                    2,412           2,105           2,793
    -------------------------------------------------------------------------
    Total PPP                         4,903           4,269           5,337
    -------------------------------------------------------------------------

    -  Gran Tierra Energy had no proved gas reserves in Argentina at
       year-end 2008;

    -  In addition to the above probable light and medium oil reserves, Gran
       Tierra Energy also has year-end 2009 NAR probable gas reserves of
       approximately 1.1 BCF in Argentina. Gran Tierra Energy had year-end
       2008 NAR probable gas reserves of approximately 1.2 BCF;

    -  In addition to the above possible light and medium oil reserves, Gran
       Tierra Energy also has year-end 2009 NAR possible gas reserves of
       approximately 33.1 BCF in Argentina. Gran Tierra Energy had year-end
       2008 NAR possible gas reserves of approximately 14.7 BCF.
    

Current Production

Gran Tierra Energy is currently producing approximately 14,800 barrels of oil per day (BOPD) NAR. About 14,000 BOPD NAR production is from Colombia and approximately 800 BOPD NAR production is from Argentina.

With the production capacity available from existing wells, Gran Tierra Energy plans to maintain its net after royalty production in Colombia between 13,000 BOPD and 15,000 BOPD independent of any exploration success in 2010.

Gran Tierra Energy's net after royalty production rate for Argentina is expected to remain constant at approximately 1,000 barrels of oil equivalent per day (BOEPD) throughout 2010.

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, and has opened a business development office in Rio de Janeiro, Brazil. 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, on SEDAR (www.sedar.com) and with the Securities and Exchange Commission (www.sec.gov).

Cautionary Statements:

Possible reserves are those additional reserves that are less certain to be recovered than probable reserves. There is a 10% probability that the quantities actually recovered will equal or exceed the sum of proved plus probable plus possible reserves. The estimate of reserves for individual properties may not reflect the same confidence level as estimates of reserves for all properties, due to the effects of aggregation.

A Barrel of oil equivalent (BOE) is calculated using the conversion factor of 6,000 cubic feet ("6Mcf") of natural gas being equivalent to one barrel of oil. BOEs may be misleading, particularly if used in isolation. A BOE conversion ratio of 6 Mcf per barrel of oil is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead.

Forward-Looking Statements

The statements in this press release regarding Gran Tierra Energy's expectations, plans, projections and actions including Gran Tierra Energy's expectations regarding its 2010 exploration drilling campaign and expected funding of the campaign, and expected 2010 NAR production in Colombia and Argentina are "forward-looking statements" within the meaning of the U.S. federal and Canadian securities laws, including Canadian Securities Administrators' National Instrument 51-102 Continuous Disclosure Obligations and the U.S. Private Securities Litigation Reform Act of 1995. Statements containing the words "estimates", "expects", "will", "scheduled", "may", and variations of these words are forward-looking statements. These forward-looking 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. Although Gran Tierra Energy believes that the assumptions underlying, and expectations reflected in, these forward-looking statements are reasonable, it can give no assurance that these assumptions and expectations will prove to be correct.

Factors that could cause results to differ materially from those described in the forward-looking statements include: 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 the production, transportation or sale of oil and gas; changing prices for crude oil may cause some scheduled projects or actions to become uneconomical, or may change Gran Tierra Energy's focus to other projects or actions which could be of more benefit to Gran Tierra Energy, which could cause projects or actions currently contemplated to be postponed or cancelled; unexpected problems due to technical difficulties, operational difficulties, and weather conditions; and those other risks found in the periodic reports filed by Gran Tierra Energy with the United States Securities and Exchange Commission, including in the section entitled "Risk Factors" in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 5, 2009, and available at the Securities and Exchange Commission's internet site www.sec.gov and on SEDAR at www.sedar.com.

All forward-looking statements in this press release are expressly qualified by information contained in Gran Tierra Energy's filings with regulatory authorities and, subject to its obligations under applicable securities laws, Gran Tierra Energy does not undertake to publicly update forward-looking statements, whether as a result of new information, future events or otherwise.

SOURCE Gran Tierra Energy Inc.

For further information: For further information: For media and investor inquiries please contact Jason Crumley, Director, Investor Relations, (403) 265-3221 or info@grantierra.com

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