If you don't mind placing an object that looks like an egg beater on your roof, you might someday be able to use a personal wind turbine like this to make your electric meter spin backwards. Ben Storan's design won a $6302 British Standards Institute (BSI) Sustainability Design Award, praised for its efficiency and quietude.
What makes it so special? The odd-looking configuration can be quickly removed from a roof, saving it from hurricane force winds and such, and it uses unusual vertically oriented turbine blades and lightweight materials to enhance its efficiency. The result of this unconventional design is a power generator that can produce 1.2-kW of electricity in a 12-meter-per-second wind, and that's three times more efficient than competing designs.