Several methodological guides and environmental impact monitoring protocols exist for bottom-fixed offshore wind turbines. In France, such documents are still few in number and have been drawn up by research institutes, environmental associations or private consulting firms, most often at the request of the French State. On the other hand, tidal turbine technologies are still only at a stage of development and prototype testing. In France, only 3 pilot projects have started recently. Consequently, the environmental studies associated with these projects are carried out without a prior methodological framework, as there is currently no generic protocol to frame this technology in France.