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An international group of researchers, coordinated by the Institute of Solar Research of the German Aerospace Center e.V. (DLR; Cologne, Germany; www.dlr.de), is developing a sulfur-based storage system for solar power. Large-scale chemical storage of solar power and its overnight use as a fuel are to be achieved by means of a closed sulfur-sulfuric acid cycle. The four-year, €4.7-million Pegasus project is being funded under the E.U.’s Horizon 2020 Framework Program. The partners are DLR, the Karlsruhe Institute of Technology (KIT; Germany) the Center for Research and Technology CERTH (Greece), Brightsource Industries Israel Ltd., Processi Innovativi S.r.l. (Italy) and Baltic Ceramics S.A. (Poland). In the process under development (diagram), elemental sulfur is burned as fuel for a power plant, producing electricity and SO2 gas. The SO2 is mixed with water and converted to fresh sulfur and dilute sulfuric acid in a disproportionation reactor. Both products (S and H2SO4) can be easily stored using conventional technology. To complete the cycle, the H2SO4 is concentrated and decomposed using heat produced by a concentrated solar-thermal tower. The technology will be tested under real conditions at the Jülich Solar Power Tower…