Ford will be using CES as the stage next week to show off its new C-Max Solar Energi concept, a plug-in hybrid with a twist: instead of actually plugging it into an outlet when its parked, you can just let the sun do the work. The company worked with the Georgia Institute of Technology and California solar energy firm SunPower on the project, which uses Fresnel lenses to concentrate the suns rays on a relatively compact panel atop the C-Maxs roof. Fords quoted range on the car adds up to 620 miles off a combination of gas and electric, with up to 21 electric-only miles. Presumably, optimal charging only happens on a sunny day, but the Solar Energi can still be plugged in if needed.