Image credit Kepler Energy
According to Kepler Energy, that’s using second generation tidal turbine (THAWT), developed by Oxford University’s department of engineering science, the tidal turbines will produce cheaper electricity than off-shore wind farms and will not harm the environment.
Tests has successfully demonstrated potential effectiveness significantly higher than existing axial flow designs.
The Kepler Transverse Horizontal Axis Water Turbine (THAWT) is designed to be operated either in arrays or in stand-alone form. It is highly effective and efficient in terms of extracting the maximum power from given stretches of tidal or river current. Theoretical analysis and modelling, confirmed by testing, has shown outputs several times higher than those achievable by propeller type turbines placed in the same site. This advantage arises from the greater rectangular swept area of a THAWT rotor compared with the depth limited circular swept areas of multiple propeller type rotors and the fact that greater powers can be extracted from tidal flows by optimising the blockage ratio (swept area of turbine divided by flow area).
source Kepler Energy