Personal water turbine delivers free power from the nearest river

Hydroelectric power has been around for over 100 years, but we tend to think of it as requiring huge installations, built to power cities. This tiny water turbine scales it down to a personal level, providing an alternative to small gas and wind powered generators. To use the Ibasei Cappa generator, simply submerge it in fast-moving water. It relies on a tapered diffuser housing that increases the speed of water flowing through the turbine, boosting the amount of power it can deliver. It only delivers around 250 watts, so don't expect to run your electric stove using this thing, but a laptop? Sure.