CORAL is a 3.5 year research project exploring a novel concept for metal oxidation utilizing retrofitted coal-fired fluidized bed power plants. This project introduces an innovative approach to energy storage and CO₂–free heat and power generation by harnessing the cyclic reduction and oxidation of metal oxides. The process employs a retrofittable approach to existing coal-fired fluidized bed power plants, utilizing a hydrogen-based reduction of metal oxides and subsequent oxidation in fluidized beds. This cycle not only leverages existing infrastructure but also eliminates CO₂ emissions. With iron as a cost-effective, energy-dense material, this system can store energy seasonally and offer scalable solutions for energy storage. Key technical developments focus on optimizing boiler efficiency, integrating particle feeding/extraction, and enhancing overall economic and environmental viability.