Opcon publishes an addition to its offer document

Opcon publishes an addition to its offer document

This press release may not, directly or indirectly, be distributed or published
in the United States, Australia, Japan, Canada, Switzerland or South Africa. The
offer is not directed to such persons whose participation is conditional upon
the performance of prospectus, registration or other procedures in addition to
those prescribed in Swedish law.

On 10 February 2010 Opcon submitted a public acquisition offer to shareholders
of Tricorona. The offer was one (1) newly issued Opcon share for 6.5 Tricorona
shares. On 18 March 2010 Opcon published the offer document regarding this
offer. On 24 March a first addition to the offer document was published.

A second addition to the offer document is now available at www.opcon.se. This
addition has been made following the press release published by Opcon on 30
March 2010 concerning Opcon's comment on statements from the board of Tricorona
and the press release that Tricorona published on 29 March with its
recommendation to the shareholders of Tricorona regarding Opcon's offer.  

For further information please contact:

Niklas Johansson, vice president, Investor Relations, tel. 08-466 45 00, 070-592
54 53

Opcon AB, Box 15085, 104 65 Stockholm
Tel. 08-466 45 00, fax 08-716 76 61
e-post: info@Opcon.se
www.Opcon.se

About Opcon
Opcon is an energy and environmental technology Group that develop, produces and
markets systems and products for eco-friendly, efficient and resource-effective
use of energy.

Opcon has activities in Sweden, China, Germany, the UK and Denmark. Opcon has
about 380 employees. The company's shares are listed on Nasdaq OMX Stockholm.
The Group comprises three business areas:

Renewable Energy focuses on generating electricity from waste heat, bioenergy,
systems for handling natural gas, industrial cooling, recycling of heat, drying
of biomass, treatment of flue gases, handling systems for bioenergy, etc., air
systems for fuel cells and measurement and monitoring of processes. 

Engine Efficiency focuses on ignition systems for combustion engines including
ethanol, natural gas and biogas engines. 

Mobility Products focuses on technology for positioning, motion and regulation
for electrical vehicles, electrical wheelchairs and hospital beds.