JA Solar Holdings Co., Ltd. is a holding company. The Company designs, develops, manufactures and sells solar power products that convert sunlight into electricity for a range of uses. The Company is engaged in manufacturing and selling solar modules, as well as silicon wafer manufacturing. The Company operates through two segments, including manufacturing and solar projects. The manufacturing segment includes design, development and manufacture of photovoltaic (PV) products. The solar projects segment includes downstream solar projects, which are involved in electricity generation. The Company's principal products consist of both monocrystalline and multicrystalline solar cells and solar modules. The Company sells its products primarily under JA Solar brand name, and also produces original equipment for manufacturers or customers. The Company is also engaged in the provision of solar product processing services and project development services.