Join Date: Apr 2006
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The NYC project consists of very conventional propellor-drive generators, set on pylons in the East River. (Which is a flooded estuary, not a river, with heavy reversing tides.)
So far they've managed to flood one unit, break the blades off two more, and do a lot of expensive lab science while generating some power. Seems like physically building the generators strong enough to keep them working for any length of time has been beyond the folks who got the contract to do it.