The
Fromveur Passage (; ), sometimes called
St. Vincent's Channel, is a
strait that lies between the island of
Ushant and Kéréon lighthouse on Men Tensel Rock, off the coast of the
France province of
Brittany. It forms part of the northern limit of the
Iroise Sea.
The name Fromveur comes from the Breton language words , meaning current, and meaning great, as the passage can exhibit strong , often running at . These currents, the second strongest in France after those of the Alderney Race in Normandy, make the passage a promising location for tidal power installations. In 2013, GDF Suez announced plans to install a 0.5-megawatt test tidal turbine in the passage in 2014. The Sabella D10 turbine was finally installed in 2015, providing power to the island of Ushant. In September 2023, it supplied 25% of the electricity consumed on the island. Since October 2024, the turbine is operated by Inyanga Marine Energy Group, after Sabella went into administration. Inyanga have a license to operate the turbine until August 2028.