(EnergyAsia, June 9, Monday) — China’s Yingli Green Energy Holding Company Limited, a world leading vertically integrated photovoltaic (PV) product manufacturer, said it has signed a polysilicon supply contract with Sailing New Energy Resources Co Ltd. Sailing, a polysilicon supplier located in Chongqing, China, will supply polysilicon to Yingli from the fourth quarter of 2008…