The company invested about $10m upgrading two buildings at the location, one of which will support the growing demand for solar power in the US.
Siemens is currently producing SINVERT PVS inverters in West Chicago to support a 20MW solar project in the southwest US.
The multi-million dollar contract was secured in early 2011, with commissioning of the inverters slated for October of this year.
Siemens West Chicago manufacturing facilities comprise 200,000sq ft in two buildings.
Siemens also manufactures motor control centers, enclosed motor starters, switchboards and control cabinets at the facilities.
The West Chicago plant is expected to produce inverters with an annual output of about 500MW.
