Polarium South Africa, the local subsidiary of Swedish energy storage group Polarium, plans to double the capacity of its Cape Town assembly plant by the end of this year. This was reported at a media briefing on Wednesday. The plant only started production last April and is the result of a $30-million investment in South Africa. The Polarium group has a policy of placing its plants in strategically chosen locations in its various market regions, to minimize transport costs and to minimize carbon emissions. Apart from Sweden and South Africa, it also has plants in Mexico and Vietnam. The South African plant has already assembled some 15 000 lithium-ion batteries, for energy storage applications across Africa.