France’s minister of Ecology and Energy announced that the country will pave 621 miles of road with solar panels over the next five years, with the goal of providing cheap, renewable energy to five million people.

Called “the Wattway,” the roads will be built in collaboration with the French road-building company Colas and the National Institute of Solar Energy. The company spent the last five years developing solar panels that are only about a quarter of an inch thick and are hardy enough to stand up to…