Analysis of an energy storage system using reversible calcium hydroxide in fluidised-bed reactors

•Conceptual study of new CSP-TCES layouts based on calcium hydroxide reaction.•Single fluidised bed reactor designs simplify plant integration and reduce costs.•Design and operation challenges with different requirements in charge and discharge.•Novel insights for reactor design and thermal integration of the systems.•Competitive round-trip efficiency values of 68% and LCOE values of 67–83 $/MWhe.