Chemical emissions from offshore wind farms: From identification to challenges in impact assessment and regulation
2025
Hengstmann, Elena | Zapata Corella, Pablo | Alter, Katharina | Belzunce-segarra, Maria J. | Booth, Andy M. | Castro Jimenez, Javier | Czerner, Niklas | De Cauwer, Karien | Deviller, Geneviève | Gomiero, Alessio | Goseberg, Nils | Hasenbein, Simone | Kirchgeorg, Torben | Mason, Claire | Pape, Wiebke | Parmentier, Koen | Plaß, Anna | Pröfrock, Daniel | Sarhadi, Ali | Vanavermaete, David | Van Der Molen, Johan | Vinagre, Pedro Almeida | Wood, Daniel | Weinberg, Ingo | Windt, Christian | Zonderman, Alexa | Kenyon, Jennifer | De Witte, Bavo
Offshore wind energy may offer many advantages: next to the aim of renewable energy production, offshore wind farms (OWFs) enable multi-purpose opportunities with nature conservation and aquaculture. OWFs may also affect the marine ecosystem. The environmental impact of OWFs is starting to be investigated regarding the effect of novel habitat introduction, underwater noise, electromagnetic fields, or exclusion of fisheries. However, the impact of chemical emissions from OWFs remains largely unknown. It is essential to account for these emissions at an early stage, to comprehensively assess the environmental impact with the objective of developing a future fit-for-purpose regulatory framework to protect the marine environment. This review compiled a literature-based list of potential OWF-related chemical emissions containing >200 organic and inorganic contaminants, including polymers. Compounds are categorised according to data source and emission type. Major gaps in assessing the impact of the compounds are identified, including challenges in environmental monitoring, numerical modelling and assessing the toxicity of individual and mixtures of chemical contaminants on marine organisms and humans consuming potential OWF aquaculture products. A risk-based prioritisation is essential to target the compounds of higher concern and overcome costs linked to assessing a wide variety of chemical contaminants. Although some countries have regulations to reduce OWF chemical emissions, standardized impact assessments or monitoring requirements for OWF-based chemical contaminants have not been established. This stresses the importance of providing more detailed information on occurrence, distribution and impact of OWF chemical emissions as an essential step towards sound ecosystem-based management of OWF installations.
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