Marine biomass from offshore wind parks

Rødsand 2 Wind Park, Lolland, Denmark

rodsand_pilot_lineSpatial limitation is critical in the Baltic Sea. It is estimated that more than 3,500 km2 will be occupied by offshore wind parks by 2030. In order to use the limited maritime space efficiently, wind park and mariculture combinations are being considered for future sites. This study looks at the potential production of marine biomass (mussel – Mytilus edulis and seaweed – Ceramium rubrum, ulva sp. etc.) at the Rødsand 2 wind park south of Nysted, Lolland.

Assuming a constant biomass production throughout the year, the annual biomass production is estimated to be ≈ 1.2 kg dry matter/m2 of sea surface. This equals 33 g of sequestrated nitrogen/m2 per year corresponding to the removal of at least 330 kg of nitrogen/ha by harvesting the naturally occuring species of algae and mussels established on nets and lines at sea. Using 25% of the available space in future Baltic Sea wind parks, more than 1,000,000 tonnes of biomass could be harvested yearly corresponding to a sequestration of at least 30,000 tonnes of nitrogen.



  • Lack of tradition for cooperation between the different sectors involved, insurance issues, etc.,
  • Local operation and maintenance equipment and routines not tailored to match the needs of mariculture systems and sampling,
  • Weather conditions; waves, wind, ice,
  • Steep salinity gradients, water temperature flux, nutrient availability,
  • Lack of incentives for co-localization,
  • Lack of quantification of ecosystem service economy,
  • Lack of environmental impact knowledge and data,
  • Difficulties in achieving environmental permits,
  • Lack of funding for scale up Baltic Sea pilot sites.

green_centerFurther information:

Pia Bro Christensen
Green Center
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