High Quality Content by WIKIPEDIA articles! China has over 400 photovoltaic (PV) companies and produces approximately 18% of the photovoltaic products worldwide. In 2007 China produced 1700 MW of solar panels, nearly half of the world production of 3800 MW, although 99% was exported. China has installed about 80 MW of photovoltaics. Solar water heating is used extensively, though. These factories include the GCL-Poly Energy Holdings Limited, which has a polysilicon production capacity of 18,000 MT (YE2009); the Suntech Power, which produces approximately 50 MW/year of solar cells and photovoltaic modules; the Yunnan Semi-conductor Parts Plant, which manufactures approximately 2 MW/year of monocrystalline cells; the Yingli Solar, which manufactures approximately 600 MW/year of polycrystalline cells and modules; the Guofei Green Energy Source, which produces approximately 1 MW/year of modules; and the Shanghai Poly-Vision Energy Science & Technology, which produces approximately 5 MW/year of modules.