A hydroelectric generator barrel is a spinning water wheel that floats on the water surface and turns in the current. The spinning motion drives permanent magnet generators inside. It could generate enough power to light banks of LEDs and light up bridges
Finally, A More Exciting Design For Wind Power- a new turbine design called the Windstrument. They’re hailing the product as "a truly affordable wind energy system,” that’s "quiet and powerful, bird safe, and scalable.