Redstone Solar Thermal Power (RSTP) is a solar power tower with molten salt energy storage, located in Postmasburg, near Kimberley, in the Northern Cape Region of South Africa. Redstone will have a capacity of 100 megawatts (MW) to deliver power to 200,000 people and was awarded in bid window 3.5 of the REIPPP at a strike price of 122.3 ZAR/KWh including time of day pricing in 2015. The project was initially based on the technology of now bankrupt Solar Reserve, but was delayed for several years because the PPA was not signed by Eskom until 2018. After the project was revived, the plant was put under construction, until May 2025 when it was connected to the grid for the first time after 4 years of construction. The technology is provided by Brightsource and John Cockerill, as demonstrated in the Noor Energy 1 project in the UAE.