Help the environment, save some money—and litter your roof with bulky metal boxes. That’s the dilemma home-solar-panel buyers have faced for years. Tesla’s response: the Solar Roof, a series of tiles designed to blend together while also harnessing the power of the sun. The product line, which will be available next year, is a collaboration between Tesla and SolarCity, a longtime provider of traditional solar panels. (The former is set to acquire the latter.) And although pricing information has not yet been released, SolarCity CEO Lyndon Rive is optimistic about Solar Roof’s potential. “It’s addressing a new segment,” he says, referring to the 5 million Americans who install new roofs each year, some of whom might want to go solar.