Diversified industrial group Thyssenkrupp Uhde South Africa and German uranium mining company Wismut have been appointed to execute a prefeasibility study for a renewable underground pumped hydroelectric energy storage (Ruphes) project on a specific but undisclosed site owned by a South African mining company. Thyssenkrupp Uhde South Africa is collaborating with international specialist companies to facilitate mine repurposing and has already signed a cooperation agreement with Wismut.