The average production in June 2010, compared to the average production in May 2010,
was:

Production* June 2010 May 2010
Peru 3’197 3’392
Colombia 1’861 2’100
Total 5’058 5’492

*The production is average daily production (bopd) and is working interest before
royalty

The production in Colombia in May includes test production from Altair-1. Juni
production does not include any production from Altair.

Oil has been sold at average sales price of USD 73.47 in Peru and USD 68.89 in Colombia
per barrel during May.

For more information please contact:

Fredrik von Zernichow

Investor Relation Manager

Tel: +47 6751 8661

Mob: +47 9927 3843

Fax: +47 6751 8660

E-mail: f.zernichow@interoil.no mailto:f.zernichow@interoil.no

www.interoil.no

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InterOil Exploration & Production ASA is a Norwegian based exploration and production
company – listed on the Oslo Stock Exchange – with focus on Latin-America. The company
is operator of several production and exploration assets in Peru and Colombia, and is an
active license partner in Angola and Ghana. InterOil currently employs approximately 250
people and is headquartered in Oslo.

This information is subject of the disclosure requirements acc. to §5-12 vphl (Norwegian
Securities Trading Act)