Utility-scale solar systems cost about $3.40 per watt of power they can generate (systems on the roofs of houses can cost twice that). About 26 cents goes for materials such as glass and protective coatings; that cost can be trimmed by using injection-molded frames and different materials for encapsulating the cells. Other advances could cut the cost of inverters, which now amount to 22 cents per watt, and the mounting hardware (about 25 cents). Then there’s wiring, labor, and design costs. The list goes on.
Kevin Bullis, www.technologyreview.com/