2003
SOJO imported switchgears from abroad and distributed them on the Chinese market.

2004
We developed and launched our first SF6 metal-clad RMU.

2005
SOJO started to design and produce compact substation and pole mounted switch and metal-clad switchgear. We got the ISO9001 certificate and started to use ERP management system.

2006
The construction of our new production base in Huairou District, Beijing, was started.

2007
We launched our solid insulated RMU which comes with international patent developed by ourselves. This product was also one of its kind on Chinese market. We got the ISO14001 certificate. New generation of XGW type RMU was successfully launched.

2008
SOJO joint-stock company was founded, and started to exploit the international market.

2009
Our stock had been able to be quoted and transferred through Agency Share Transfer System (Stock code: 430049; Stock name: SOJO Electric).

2010
The IPO program was officially started.

2011
SOJO was elected as one of the Forbes China Best SMEs.

2012
We started the construction of the workshop especially for solid insulated RMU.

2013
The solid insulated RMU production line was put into use. Its automation degree had surpassed 70%, and its annual production capacity reached 30,000 modules.