4 Kinetic Energy Start-ups
1. High Tide
Founder Albert Hartman was working on a kinetic energy charger for the U.S. military when he realized that his concept could easily work for consumers. He designed the RollerGen, a generator that sits on the back wheel of a bicycle. A lever moves the generator on or off the wheel, increasing or decreasing the resistance and producing as much as 30 watts of power. A 30-minute ride charges the RollerGen battery, enough for three iPhone charges. The system retails for about $500.