Ford plans to unveil at this month’s International CES gadget show a solar-powered concept car that offers the same performance as a plug-in hybrid but without the need for a plug.

The C-MAX Solar Energi Concept car uses a gasoline engine combined with a gizmo that acts like a magnifying glass to concentrate the sun’s rays on the vehicle’s roof-mounted solar panels. The automaker says the vehicle’s estimated combined city-highway mileage is 100 mpg.