Biogas plants

Selection of right process type

We select the rigth process type based on biogas production trials and our 20 years of exprience. If biomass is new for us, then biogas production trials need to be done before binding offers.


Wet fermentation process

Metener has designed and constructed over 10 full scale biogas plants based on traditionell wet fermentation process. This is suitable for high water content biomasses like sludge, biowaste, food industry and municipal waste. Also it is possible to add small amounts of dry biomasses like grass and maize to the process. It is possible to add pasteurization unit for this plant type and it is necessary for biomasses with hygienic risk.

Dry fermentation process

Metener has developed and patented batch digestion process for dry, slowly degradable biomasses like straw, grass and wood. Research and development has been done since 2005 in pilot scale and since 2015 in full scale digesters.

Load here Metener-brochure.

Ask also small scale solutions! We are able to deliver container size dry fermenter. With three container size dry fermenters production is around 300 MWh / year gas energy, when straw or grass (side stream from crop cultivation) is used. More info:


Energy production

  • Heat. Biogas is easy to use in boilers. Gas burner is possible to be installed to oil boiler.
  • Combined heat and power (CHP). When electricity is needed, biogas is used in CHP unit, which produces 35-42% electricity and 43-50% heat.
  • Traffic fuel. Biogas is upgraded and pressurized before filling to vehicles. Upgraded biogas is called biomethane and it is like natural gas, although biogas is renewable energy! Biogas / natural gas car is called CNG.
  • Biogas is possible to transfer by pipeline or by bottles. If biogas utilization (like CHP) is not next to the biogas plant, biogas can be transferred to the utilization place by pipeline with no energy losses. Biogas can be also bottled but first it need to be upgraded and pressurized.

        Construction in Finland, licensing model for export

        Metener has delivered several turnkey biogas plants in Finland. We have talented and educated team with expertice on automation, pipeworks and biogas equipment installations. Groundwork and construction we mainly buy from reliable subcontractors.

        Outside Finland there are multiple options. With licensing agreement, we train customer to build biogas plant and we only deliver design documents, consultation during procurement and construction, technology including key components and automation and commissioning.

        With long term operational support service we make sure customer is able to keep processes up and running.


        Metener biogas plants fullfills European laws and regulations concerning human, environment and fire safety. Our automation system have many security features that protects processes and structures from human mistake and unexpected situations. All equipment are tested and gas pipes and pressure vessels pressure tested before delivery. Operational and maintenance manuals are given in english.