Tiendeveen drilling commences

14 August 2009
Northern Petroleum Plc

("Northern")

Tiendeveen drilling commences

Northern announces that its wholly owned subsidiary Northern Petroleum Nederland B.V ("NPN") has
commenced drilling operations on the exploration well Tiendeveen in the Drenthe III licence on 12
August 2009.

Tiendeveen is sited in the east of The Netherlands, 3.8 kilometers northwest of Northern's
Geesbrug gas field development. The estimated mean potential gas in place is 60bcf with an upside
P10 potential of 98bcf. The well is expected to take 50 days to reach 3842m measured depth (about
3500m true vertical depth) and log the well.

Licence and working interests:
NPN: 45%
EBN: 40%
Dyas: B.V. 15%

In accordance with the AIM Rules - Guidance for Mining and Oil & Gas Companies, the information
contained in this announcement has been reviewed and signed off by the Exploration and Technical
Director of Northern, Mr Graham Heard CGeol FGS, who has over 30 years experience as a petroleum
geologist.

---ENDS---

For further information please contact:

Northern Petroleum Plc Tel: +44 (0) 20 7469 2900
Derek Musgrove, Managing Director
Sophie Hull, Head of Corporate Communications

Jefferies International Tel: +44 (0) 20 7029 8000
Chris Snoxall / Schuyler Evans

Astaire Securities Tel: +44 (0) 20 7448 4400
Jerry Keen / Toby Gibbs

Bishopsgate Communications Limited (Press) Tel: +44 (0) 20 7562 3350
Nick Rome / Michael Kinirons

Buchanan Communications Limited (Analysts) Tel: +44 (0) 20 7466 5000
Tim Thompson / Ben Romney

Notes to Editors

Northern Petroleum Plc ("NOP") is an AIM quoted oil and gas production, development, exploration
and asset trading company focused on areas of low political risk in Europe. Quoted on the London
Stock Exchange the Company obtains significant concentrated licence positions and adds value at
reasonable risk utilising new ideas together with new drilling, seismic, completion and computer
technologies where it is believed that economic oil and gas production can be established. Efforts
are concentrated in three countries (Netherlands, Italy and England) with the risk spread over in
excess of 50 projects in 12 petroleum systems. It operates on both onshore and offshore projects
including a producing gas field.

Following the acquisition of ATI Oil Plc, Northern has recoverable Proven and Probable reserves of
approximately 103 million barrels of oil equivalence. It is currently producing gas at Waalwijk
and the offshore P12 fields.

The planned development of six onshore oil and gas fields is being progressed with Dyas B.V., EBN,
the Netherlands' state oil company, and NAM as partners.

Northern manages the largest licensed exploration area in Italy, with over 14,000 km²,
predominantly offshore, but includes six licences in the Po Valley oil and gas province in the
north of the country.

In the UK Northern has licences in the south of England where it has a 10% interest in the
production from the Horndean oil field and a 5% interest in the Avington oil field. It also has
planning consents to drill an eastward extension of the Horndean oil field and an exploration well
at Havant. Northern has a 50% interest in these ventures.

For further information on Northern visit www.northpet.com.