The energy potential offered by the Raz Blanchard is a unique opportunity for the development and integration of innovative low-carbon technologies into the energy mix.
The Raz Blanchard is a tidal passage located between the Westerly point of the Cap de la Hauge and the Channel Island of Alderney. The tidal currents are funnelled between the landmasses, producing one of the most powerful flows in the world, representing a huge untapped renewable and predictable energy resource.
Four AR3000 turbines will be deployed subsea 3km west of the Cap de la Hague, Normandy, generating electricity from the strong tidal currents which will be transmitted to the French mainland and fed into the national grid.
The array of only 4 turbines will have a nominal power of 12MW, supplying clean energy to up to 7,000 homes and businesses.
Extensive environmental research activities were conducted to identify optimal array layout and the ideal location of the microsite, to ensure respect for navigation, maritime safety and marine life:
- Mapping of bathymetric data from geophysical survey campaigns
- Measurement of marine currents and wave conditions from in situ seabed sensors
- Development of an environmental monitoring programme
- Environmental studies: navigation and maritime safety, fishing, predictive acoustics, nature survey of the onshore delivery station in Jobourg, Natura 2000 zone impact assessment
The turbines will be completely submerged in a minimum depth of 38meters, having no visual impact and out of danger for navigation and maritime safety, respecting the marine environment.
Three turbines are placed in a row facing the ebb tide, with a fourth positioned further downstream in the concession area. The layout was selected to optimise space, minimise potential environmental impact and to avoid wake interactions between the turbines.