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Tidal Power Trial for East River
New York City's East River is the site for the first US commercial scale tidal generator project. Using small anchored underwater turbines, they want to show that slow and steady tides have tremendous generating capacity and can be used safely in a lot of areas. Once fully deployed, the system will generate 10 megawatts. The only drawback is when the tides shift and slow down, currently-double pun intended-they operate 77% of the time.
..."One of the 16-foot-diameter, windmill-like turbines is already operating, supplying power to a grocery store and a garage on Roosevelt Island. The other turbines are being installed during the next two weeks."...more there
Verdant Power website
ed:I know I mentioned it before here, but for any new readers, you can get small scale hydro generators designed to throw into streams or tow behind a boat or use with the tides when anchored up. Perhaps good for your summer cabin or if you have a stream on the property, as a backup perhaps. Supposedly they work OK, although I have never used one personally. Google is your friend there, most big marine suppliers will have them.