(EnergyAsia, July 23) — China’s Yingli Green Energy, a vertically integrated photovoltaic (PV) product manufacturer, said it has signed a long-term agreement to supply polysilicon Wacker Chemie of Germany from 2010 through 2018.Yingli Green Energy will produce 400MW of PV modules over the life of the agreement.Chairman and CEO Liansheng Miao said: “This new long-term…