Redstone Solar Thermal Power (RSTP) is a planned solar power tower solar thermal power plant, located in Postmasburg, near Kimberley, in the Northern Cape Region of South Africa. Redstone Solar Thermal Power is 100 megawatts (MW), and will be the first solar tower plant with molten salt energy storage in Africa.In January 2015, the South Africa Department of Energy awarded the RSTP project to a consortium led by SolarReserve and the Arabian Company for Water and Power Development (ACWA Power).