Appraisal update

Exillon Energy plc

28 March 2011 - Exillon Energy plc ("Exillon Energy", the "Company" or the "Group") (EXI.LN), a British listed independent oil producer with assets in two oil-rich regions of northern Russia, Timan-Pechora ("Exillon TP") and West Siberia ("Exillon WS"), is pleased to announce that appraisal well 5 (EWS I - 50P) successfully found oil on the northern extension of the East EWS I field.

Appraisal well 5 (EWS I - 50Р) was designed to test a 5 sq km northern extension to the East EWS I field. The new appraisal contained pre drill estimates of 13.3 million barrels of possible reserves (Miller and Lents December 2010 reserves report). The well encountered the Jurassic P reservoir at 1858 m which is 2 meters higher than previously thought. Results of wire line logging combined with oil shows and sample analysis whilst drilling, have confirmed the presence of 13.9 m of gross oil pay within the Jurassic. The well was spudded on 9 March 2011 was drilled in 18 days on a northern part of the East EWS I field. Testing of the well will be completed by the end of April.

The appraisal is the result of the continued application of 3D seismic combined with a thorough understanding of reservoir geology.

Contact Details:

Tom Blackwell

[email protected]

Tel: +44 207 920 2330