Alderney Race
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The Alderney Race is 8 nautical miles (15 km; 9.2 mi) across and located roughly between Alderney, in the Bailiwick of Guernsey, and La Hague, France. It constitutes the northeastern limit of the Gulf of Saint-Malo.
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Sea conditions
When the wind and the race current flow in opposite directions, the sea becomes particularly chaotic: wave heights can reach 4 metres (13 ft) and have wavelengths smaller than 50 metres (164 ft). The waves break with violence, thus making shipping conditions particularly dangerous. On the contrary, when the wind and the stream flow in the same direction, the sea becomes calm, provided that the tidal coefficient is not too great.
The uneven seabed – both Alderney and La Hague lie in the Armorican Massif – makes the situation more complicated. Bad weather can produce abundant wind-blown foam, making visibility poor. During good weather, opposing wind and currents can cause breaking waves, especially at Banc de la Schôle and at Longis Bay in Alderney.
Hydrology
The power of the current comes from the narrowness of the strait and from the fact that there is a 2-metre (6 ft 7 in) tidal height difference between Carteret and La Hague as well as between la Hague and Cherbourg.
Tidal power
Because of the enormous potential it sees in tidal power, the French government plans to use tidal turbines to tap the energy of the Race.