The World's Largest Tidal Turbine, Unveiled

The largest tidal turbine in the world, the AK1000, was unveiled yesterday. It weighs 130 tons and stands nearly 74 feet tall. It will be installed off the coast of Orkney, Scotland, where, if all goes according to plan, its "environmentally benign" low rotation speed will generate enough electricity for 1,000 homes on the local grid for decades.