SEM-REV presentation & mission

SEM-REV is the first European site for multi-technology offshore testing that is connected to the grid. It has all the equipment - offshore and on land - to develop, test and improve energy recovery systems (mainly from wind and wave sources). It will play a decisive role in meeting the challenge of Marine Renewable Energy development in France and helping industrialists to develop new energy production capacities.

Created in 2007 by Centrale Nantes, SEM-REV is operated since 2023 by the OPEN-C Foundation which coordinates, develops and manages offshore tests for floating offshore wind, tidal power, wave energy, offshore hydrogen and floating photovoltaics, making it Europe's largest offshore testing centre.

Using the well-known expertise of its team in the scope of marine renewable energy, the strategy consists in building up a continuous and pragmatic approach to the testing of technologies, and offers the corresponding facilities and services from the initial proof of concept to the large scale verification of prototypes at sea. This tryptic "modeling / ocean tank experimentation / real conditions experimentation" is a unique accelerator of MRE technologies.


It comprises:
  • A 1km2 designated maritime zone, 20km off the coast from Le Croisic, fully equipped to measure sea and weather conditions (wind, swell and local parameters) and clearly marked out by cardinal buoys.
  • Electric infrastructure to connect the system to the Enedis medium-voltage network via an 8MW 25km-long cable
  • A hub enabling the simultaneous connection of three machines
  • A research centre, located at Penn-Avel, to receive and analyse data and control the test devices -staffed by a dozen researchers and engineers.
Site selection was based on field studies that identified an optimum site off the coast of Le Croisic on the basis of environmental and regulatory technical constraints and respect for the use of maritime spaces by offshore professionals.


SEM-REV is part of a large regional industrial and research network. The offshore test site enables:

  • Provision of an offshore area fully dedicated to the installation and operation of technologies through the permits and authorization obtained:
    • Approval under the French “Water Act”: preliminary consultation with sea users (fishermen, local authorities, associations) and environmental impact studies
    • The temporary concession for the occupation of a restricted sea zone: conditions of use, markings, maritime security with preliminary notice and recommendations to the maritime authorities
    • The power exploitation permit granted by the Ministry of Energy
    • Provision of access to meteorological data, oceanographic data and to control means, as well as offices for test surveillance
  • Maintenance of monitoring tools in operational conditions
  • Environmental impact assessment (marine environment and other usages)
  • Respect of rules regarding maritime safety
  • Support for the developers in terms of marine operations (booking of naval means, divers, sub-contracting to qualified staff…)
  • Support for transport and logistic activities (storage in harbor in the area, handling, booking of handling zones…)
Published on June 30, 2017 Updated on July 20, 2023