In the case of tidal energy, the main challenge is to succeed in operating in very harsh conditions although the potential remains very high. Technologies are now tested on a large scale in real sea conditions with a convergence for high current areas (e.g., MeyGen, ENGIE). For waves, the industry took a step back a few years ago in order to focus on components (e.g., Drivetrain), and is now moving back towards testing full devices. For combined tidal and wave energies, developments and tests are increasing namely outside of Europe (Japan, Faroe Islands, China, Chile, etc.).
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