Yingli Green Energy Holding Company Limited is a vertically integrated photovoltaic (PV), product manufacturer worldwide. The Company designs, manufactures and sells PV modules, and designs, assembles, sells and install PV systems. The Company's products and services include the manufacture of polysilicon ingots and wafers, PV cells, PV modules and integrated PV systems. Its end-products include PV modules and PV systems in different sizes and power outputs. It sells PV modules under its own brand names, Yingli and Yingli Solar, to PV system integrators and distributors located in various markets around the world, including Germany, the United States, Italy, China, Spain, the Netherlands, France, the United Kingdom, Japan, Israel and Slovenia. On April 8, 2011, the Company acquired 80% of the ownership in Baoding Zhongtai New Energy Resources Co., Ltd.