First tidal turbine in US goes live in Maine

How beneficial this will be still needs to be answered, but it's good to see new energy efforts being explored in the US. Tidal energy has been implemented in Europe and there have been some positive results in terms of generating new forms of energy. The issue of underwater damage is always going to be there so minimizing that impact is critical for the success of any of these programs.
Early days, but it's a big step.

Maine's Ocean Renewable Power Co. has started generating electricity for the power grid from its tidal energy turbine on the bottom of Cobscook Bay near Lubec, in easternmost Maine. It is the first commercial tidal energy project to do so in North America, beating larger rivals who have tested or plan to test devices of their own in the Bay of Fundy region.

Company spokeswoman Susy Kist confirmed Thursday that the turbine has been generating power for the grid.

She said power started flowing nearly two weeks ago, but the company had been waiting to announce the milestone until local utility Bangor Hydro had an opportunity to confirm it. The turbine can generate 180 kilowatts of electricity, enough to power 30 homes, according to The New York Times.