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From The Engineer:
Successful tests of a new type of tidal turbine have boosted hopes that a full-size prototype can undergo sea trials in 2011. Its developers believe the transverse horizontal axis water turbine (THAWT) could harvest energy from tidal flows more efficiently and at a lower cost than other systems.
THAWT is a horizontal rotor with the key advantage that it is scalable. The conventional tidal turbines that it could supersede are similar to the familiar three-bladed wind turbines, each of which intercepts just part of the available flow. The main advantage of THAWT, according to its inventors from Oxford University, is that it can be extended to capture energy from across the entire flow.
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