The multicycle carbonation/calcination of CaO, also known as calcium looping (CaL) has been demonstrated as a feasible technology for reducing CO2 emissions in fossil fuel power plants. In this process, the CO2 released with the flue gas stream from the power plant reacts with CaO particles in a carbonator reactor under such favourable conditions that the carbonation reaction takes place very rapidly and the evolved gases from the carbonator are almost CO2 free. The CaO sorbent for subsequent carbonation reactions is regenerated in a calciner where the reverse reaction takes place. More recently, CaL has also been proposed as a thermochemical energy storage system in concentrated solar power plants (CSP-CaL). In this way, solar radiation is employed to drive the endothermic decarbonation reaction at high temperatures. The chemical energy stored in the reaction products; CO2 and CaO can be recovered by inducing the exothermic carbonation reaction thereby producing electricity on demand even after sunset. The reliable estimation of the kinetics driving both carbonation and calcination reactions is of fundamental importance for modeling the process and designing the plant. For instance, the minimum required residence times for significant carbonation are quite relevant as short residence times are a must for CaL to be efficient. However, the reversible carbonation kinetics are very complex due to strong dependence on CaO microstructure. Moreover, the initially fast kinetics are progressively hindered by sintering-induced deactivation during ensuing. Finally, the working conditions for carbonation and calcination are constrained by the application and demands operating nearby equilibrium, thereby imposing an additional layer of complexity to kinetic studies