Khi Solar One (KSO) is a solar power tower solar thermal power plant, located in the Northern Cape Region of South Africa. Khi Solar One is 50 megawatts (MW), and will be the first solar tower plant in Africa. It covers an area of 140 hectares (346 acres).The KSO is an evolution of the PS10 and PS20 projects, operating since 2007 and 2009 respectively in Spain.