An employee makes a final inspection on panels during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. An employee works at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. Employees work at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

An employee works at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. An employee works at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

REC's Chief Executive Officer Steve O'Neil poses for a portrait in their solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Employees work at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

REC's Chief Executive Officer Steve O'Neil talks about their Twin Peaks solar panel in their manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

A robot operates at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

A signage at an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

An employees works at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. Employees work at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. REC's Chief Operating Officer Ter Soon Kim talks about their panels during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose. Employees work at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

Image used for illustrative purpose only. An employee makes a final inspection on panels during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su

A robot operates at a production line during a tour of an REC solar panel manufacturing plant in Singapore May 5, 2017. Picture taken May 5, 2017. REUTERS/Edgar Su