http://www.hydro.com/en/press_room/news/archive/2005_11/hywind_en.html
These are what are needed in the Cape Wind situation. Anchored a few more miles offshore than the present site,they would not interfere with the residents who object to it.
By scaling the size of each machine up, the extra cost of cables to transport the power would not increase the cost per kwh. Larger machines that will not be visible from shore are preferable to smaller machines that are.
And by adding a toroidal wave power generator the power would be even less expensive, it could double the amount of kwh produced by each platform.