Bourne Energy has created a portable hydroelectric generator that weighs less than 30 pounds and can be worn like a backpack.
The appropriately-called Backpack Power Plant is capable of generating 500 watts and can quietly produce electricity from a stream four feet or deeper. To install the generator, the user digs a trench on either side of the stream or river for two lightweight anchors. A rope connects the anchors to the generator, keeping it afloat through tension.
It performs best at flow speeds of 2.3 meters per second, but can work at a variety of speeds. It produces no heat or exhaust emissions.
Bourne has designed a more-powerful and lighter version for military use in remote locations. The civilian version will sell for $3,000 and could be used in developing countries or by any hydroelectricity enthusiast.
via Wired Science