JA Solar Holdings Co., Ltd. is a holding company. The Company designs, develops, manufactures and sells solar cell and module products that convert sunlight into electricity for a range of uses. The Company is engaged in manufacturing and sales of solar modules, as well as silicon wafer manufacturing. The Company's principal products consist of both monocrystalline and multicrystalline solar cells and solar modules. It sells its products mainly under JA Solar brand name, and also produces original equipment for manufacturers or customers, known as original equipment manufacturers (OEMs).The Company also provides engineering, procurement and construction (EPC) services. The Company sells solar cell and module products to module manufacturers, system integrators, project developers and distributors. The Company's subsidiaries include JA Development Co., Ltd., JA Solar Hong Kong Limited, JA Solar GmbH., JingAo Solar Co., Ltd. and Shanghai JA Solar Technology Co., Ltd., among others.