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Solrod Biogas Plant Investment Project (SOLROD)

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The municipality of Solrød in the Zealand region of Denmark is a Covenant signatory and has already submitted a SEAP which commits to achieve a 55 % greenhouse gas emission reduction by 2025. Studies have shown a viable basis for constructing a CHP biogas plant using three main fractions: cast seaweed collected from the beaches at Bay of Køge (Køge Bugt), organic waste from the local pectin and carrageenans production facility and manure from local pigs and cattle farms. An annual CO2 reduction of approx. 40.100 tons (equal to 28 % of the municipality’s current CO2 emissions) has been projected in the feasibility study. The major objective is to ensure the launch of the CHP biogas plant in the Municipality of Solrød bringing a multitude of beneftits for local stakeholders and the wider community including the delivery of renewable energy into the district heating network with approximately 370.000 inhabitants. The MLEI support will ensure financing for the final preparation phases, including support for project management, tendering technique and communication management. The project will trigger investment of EUR 12.467.000.


  • Signed turnkey contract to build the CHP biogas plant triggering an investment €12,747,827. The plant was built in 2014/15 and is operational since autumn 2015.
  • The project meets very well the requirements of a European shining example because of its multitude of solutions found to sustainable energy and environmental challenges and due to its exemplary process to build a strong public private partnership with the full involvement of the local community and businesses including the largest pectin and carrageen manufacturing plant in the world.
  • Reduction of CO2 emissions by replacing fossil fuels (approx. 40.100 tons CO2/year) and production of 55 GWh/year of renewable energy from sustainable sources.
  • Contributing to solve problems with aquatic pollution. Removing the seaweed in Køge Bay will diminish the load of nutrients, which today is a major problem of the aquatic environment. It will also solve problems with odours from seaweed & algae which is a nuisance to the local community.
  • Delivery of 72 % of the current 2015 target of the EU Water Framework Directive for nitrogen reduction in Køge Bay and more than 100 % delivery of the reduction targets for phosphor levels. Using cast seaweed will remove 120 tons Nitrogen/year & 9 tons Phosphor/year.
  • Knowledge-sharing regarding potentials for improving sea water quality and recreational use of the maritime environment by collecting cast seaweed for renewable energy production.
  • Biomass treated in the biogas plant (digested biomass) can be used as biological fertilizer which is a more efficient fertilizer than other non-treated biological fertilizers, and as substitute of chemical fertilizers on farmland in the area.

Lessons learned

  • The idea for the biogas plant started from tackling a nuissance for the community: rotting and smelling cast seaweed at the local beaches and associated expensive cleaning efforts by the municipality. 
  • It can be advantageous if developments and optimisations of a biogas plant are organised as public-private cooperation in the early phases, i.e. in the initial and the project development phases. Such cooperation contributes to:1) more openness to different interests, 2) better projects, and 3) the chance of being more innovative in a field in need of innovation – the seaweed issue being a good example.
  • By directly involving politicians and collaborative partners during the process, the  ownership of the project is spread out to a wider group of people. This has ensured an indispensable political commitment and a significant prioritizing of the project.
  • It is a substantial advantage to organize the development process in such a way that stakeholders can be directly involved.The focus should be  on integrated design process and goal-oriented project development. To ensure  stakeholders’ involvement, it is important to focus on multilateral benefits of the biogas plant and develop these multifaceted benefits in an interaction with the various stakeholders.
  • See the Solrod Biogas publication for more lessons learnt.

Partners and coordinator

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Solrod Municipality
Solrod Center, 1
2680 Solrod Strand
Contact point: 
Mr. Rasmus Bo Hansen
+45 56182334


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