Demonstration plant WST in Ronneby


Ronneby Miljö & Teknik AB is a municipal company that is wholly owned by the municipality of Ronneby. Their goal is to combine environmental responsibility with economic efficiency. They are currently preparing the installation of a Wet Steam Turbine for electricity production on the existing district heating plant. 



Ronneby Miljö & Teknik AB is a municipally owned company, which is wholly-owned by the municipality of Ronneby. They manage power, heat, water, sewage, garbage collection, fiber optic networks and broadband. Sörbyverket, the regional district heating plant, is operated by the subsidiary company, Ronneby Miljöteknik Energi AB. 
By connecting a turbine to the existing district heating plant, Sörbyverket, Ronneby Miljö & Teknik can produce renewable electricity as well as heat. The development is in line with strategic plan of the company.


Ronneby Miljö & Teknik have chosen to install a wet steam turbine since the boiler of Sörbyverket has the opportunity of steam production. The existing system in Ronneby has been adapted to enable a connection of a wet steam turbine (WST). The turbine is planned to be inaugurated during 2018. 

The modifications made are mainly modification of the boiler circulation and existing steam dome. Safety equipment, dryout protection, etc. has been supplemented and upgraded. In addition, the boiler has been supplemented with feed water system consisting of feed water, feed water pump and safety valves.

All of the green electricity generated at Sörbyverket will be sold and distributed on the power grid. As a grid company, Ronneby Miljö & Teknik may not produce electricity, but the solution is solved by putting the electricity production in a subsidiary, Ronneby Miljöteknik Energi AB.


See the film about installing the WST.



A Wet Steam Turbine (WST) is relatively easy to implement - the upgrade takes place in the boiler water circuit without extensive reconstruction of the boiler. Compared to conventional steam turbines, WST can operate at lower pressure and lower temperature. WST is a more robust and a less high-efficiency turbine and which unlike conventional turbines, even can handle some water particles.



Download the fact sheet


WST Plant data


600 kW of electricity


Approximately 5200 hours


Approximately 2700 MWh / year


Approximately 15.2 million


Approximately 5-6 years


Wood chips, forest residues, bark, etc.




M+M Mini-Turbine

The amount of electricity produced at Sörbyverket: 

Annual production [MWh] Equals the annual electricity demand of this number of villas, source Equals the annual production of this many m2 of solar panels, source  
2700     540  27000 (5 football pitches)

The WST will open for study visits in autumn of 2017. 


 Information in Swedish Back to project information >>

Demonstration plant WST >>

Demonstration plant gasifier >>

Demonstration plant ORC >>

Wet steam turbine manufacturers

Opcon Energy System
Swedish company developing technique for small scale power production from waste heat. The systems are based on their own screw compressor technology using saturated or superheated steam. If the existing boiler does not produce any steam, a flash-tank sold by the company can make the steam required by the turbine.
One Swedish reference site is a company using wet steam in their industrial process, although with a very varying demand. By installing a wet steam turbine, they can have a continuous steam production, thereby optimizing their operation, lowering their maintenance costs, and producing their own power as well as heat, that can be sold to a district heating system.
M+M Turbinen-Technik
German company designing and manufacturing customized turbines for several different applications. Their line of production includes a mini turbine. Delivers complete installations, from turbine to generator, including associated control equipment. In Sweden there is a reference site owned by a municipal district heating company, that has installed a turbine with an output far greater than the one at Sörbyverket.
Siemens Turbomachinery Equipment (formerly KK&K - Kuhnle, Kopp & Kausch)
Global German company, which among other things develops different types of turbines, including biomass applications. It also delivers complete installations inclusive of generator and control system.
Reference site in Sweden that mainly uses biomass in a combined heat and power plant with an output far exceeding the one in Ronneby.


News about the WST in Ronneby

Information about small scale chp technologies on the Svebio conference


14- 15 of November, project manager Daniella Johansson participated on the Svebio grand biopower and heat conference in Sandviken. The conference began with a study visit to one of the biggest bio power plants in Sweden, co-owned by BillerudKorsnäs and Gävle Energi. 

During the conference many topics were discussed, among them the latest news of the climate negotiations in the EU regarding solid biomass and the pellets market in Sweden. 
During the second day of the conference, Daniella Johansson moderated a discussion of small-scale cogeneration. A new study on the potential for small-scale cogeneration and various suppliers with new technologies was presented.



The WST in place



Last week, the turbine was put inside Sörbyverket. The opening of the new wet turbine is scheduled for autumn of 2017.


WST delivery in October



Sörbyverket will soon be ready for electricity production.  Most preparations are made for the delivery of the WST in October.



Investment of ORC in BräkneHoby


Ronneby Miljö & Teknik AB is planning for an Organic Rankine Cycle in a thermal power station in BräkneHoby. The procurement of the ORC is currently in process. 

Exhibition on Ronneby Energy and Environmental Fair


Project leader Daniella Johansson talked about Small Scale CHP Life+ and local demonstration plant on Ronneby Energy and Environmental Fair.  


Plants for small-scale Combined Heat and Power production are built in Southeast Sweden for demonstration of techniques. Project runs from July 2014–December 2019.
Partners: Emå dairy and Ronneby Miljö & Teknik AB with support from EU financial instrument Life+, Swedish Energy Agency and Energiföretagen Sverige.