 The calcium looping, CAL, process is a promising technology for concentrated solar power, CSP, offering potential benefits such as reduced equipment costs, no pressure differentials between vessels, and less compression duty during energy discharge. This project proposes a new configuration of the CAL process with improved performance compared to existing designs. Process simulations suggest that the proposed system could achieve round-trip efficiencies of up to 46% and energy storage densities of up to 1 GJ slash M3. These parameters depend on the amount of residual conversion of the CAL sorbent and the efficiency of the power cycle used to remove heat from the carbonator side of the process. This article was authored by Kelly Atkinson, Robin Hughes, and Arturo Macchi.