Yingli Green Energy Holding Company Limited, together with its subsidiaries, engages in the design, development, manufacture, assembly, sale, and installation of photovoltaic (PV) products and related accessories worldwide. The company offers PV cells, PV modules, and integrated PV systems, as well as polysilicon ingots and blocks, and polysilicon wafers; and invests in renewable energy projects. It primarily sells its PV modules to distributors, wholesalers, power plant developers and operators, and PV system integrators under the Yingli and Yingli Solar brand names. Yingli Green Energy Holding Company Limited was founded in 1998 and is headquartered in Baoding, the People's Republic of China.