Renewable Energy Conferences.com | Renewable Energy Events, Conferences, Exhibitions, Training and Seminars: Yingli Green Energy's In-house Polysilicon Plant Successfully Started Commercial Operation Yingli Green Energy's In-house Polysilicon Plant Successfully Started Commercial Operation ================================================================================ REC.com on 09/08/2010 14:42:00 Trial production reached certain key technology and operating milestones in December 2009.