Hydrogen-powered cars may seem like a science fiction pipe dream, but Toyota has just made the idea a reality with the debut of its new hydrogen electric-powered FCV. The four-door sedan, which will go on sale in 2015, runs on a hydrogen fuel cell capable of producing up to 100kW of electricity. Whats more, the cells can store enough energy to get up to 300 miles on a single fill-up.Toyota says the FCV can even be used to power a home for up to a week in an emergency situation.