Is Shuang Jie the only one produced in Beijing?

No, according to the inquiry, Shuang Jie Electric Co., Ltd. has branches in Beijing, Jiangsu and other places, among which Beijing Shuang Jie Electric Co., Ltd. is responsible for the R&D, design, manufacture and sales of distributed photovoltaic power generation and intelligent charging system, which shows that Shuang Jie Electric is not the only one that produces it in Beijing.