Sem-Rev offshore test site

SEM-REV is the first European site for multi-technology offshore testing that is connected to the network. 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. It is operated by Centrale Nantes, with the aim of helping industrialists develop new energy production capacities.

Off the coast of the Pays de la Loire region

The offshore site 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 ERDF 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 to host Floatgen, the first floating wind turbine in France - 2017

In June 2017, the SEM-REV will host the Floatgen floating wind turbine demonstrator (Ideol, Bouygues Travaux Publics, Centrale Nantes), the first offshore wind turbine in France and the third floating wind turbine in Europe. Construction of the full-scale concrete floating foundation (36m x 36m x 9m high) started in June 2016 in the port of Saint Nazaire, mobilizing up to 80 workers on site. See live footage on

Floatgen will confirm performance of the floating system under real conditions and could mark the starting point for a mass deployment of floating farms in deep waters.

Two new technologies on the SEM-REV site in the framework of the FORESEA European project

FORESEA supports marine renewable energy projects on four offshore sites in Europe: SEM-REV (Pays de la Loire), EMEC (Orkney Islands, United Kingdom), SmartBay (Galway, Ireland) and Tidal Testing Center (Den Oever, The Netherlands). FORESEA is intended for developers who wish to test MRE technologies, subsystems, components, engineering solutions or products.

As part of the first call for proposals, Geps Techno and Pytheas Technology were selected to test their technologies on the SEM-REV test site. Geps Techno will test the wave-power prototype of the IHES project in 2017 (18m x 10m x 7m high) and Pytheas Technology will develop an innovative generator for renewable energies to be tested on the first French wave-power system installed on the SEM-REV site.

Support from the CPER

(CPER - Contrat de Projet Etat-Région- pluriannual French state/regional infrastructure planning and investment programmes).

The SEM-REV site was built within the framework of the CPER 2007-2013 for the Pays de la Loire region. Managed by Centrale Nantes, this operation was supervised and financed by the State, the Regional Council of Pays de la Loire, the Loire-Atlantique, as well as other bodies and local authorities. SEM-REV is organized around the "Environment and sustainable development" axis of the CPER. It is linked to the "Alternative Energy and Propulsion" project of the same contract.

SEM-REV has a steering committee made up of official representatives from the following bodies: the General Secretariat of Regional Affairs, the Regional Council of the Pays de la Loire, the Loire-Atlantique, the CNRS (the National Centre for Scientific Research) and Centrale Nantes.

Published on February 11, 2016 Updated on July 13, 2017