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During a ten year period Princess Amalia Wind Farm conducted impact monitoring: before, during and after construction. Results show that the introduction of hard substrate, in an otherwise sandy environment, and the prohibition of fisheries has attracted a rich benthic community and possibly had a positive effect on a burrowing fish species. Some bird species were present in lower numbers, others were clearly attracted to the new structures. Underwater noise levels during piling could have effected harbour porpoises. An acoustic deterrent device mitigated these risks. Post construction monitoring results showed that harbour porpoises did not avoid the operational wind farm. The presentation was given by Huygen van Steen, consultant renewable energy at Ecofys, during the Renewable UK Global Offshore Wind Conference in Glasgow on 12 June 2014.