The growing environmental concerns and the necessity to identify alternative energy sources besides traditional fossil fuels have placed increasing emphasis on renewable resources. Their discontinuous nature, however, requires the development of a storage system capable of responding to the demands of users even in conditions of absence of the resource. The primary aim of the following report is to investigate the possibilities offered by the Calcium Looping (CaL) process and its application as thermochemical energy storage system. It consists of the cyclical repetition of reversible chemical reactions of calcination-carbonation using calcium carbonate as raw material, which is extremely abundant and easily available.