There is provided a system for energy storage and CO2 capture. The system comprises CaO/CaCO3, a carbonator (1) adapted to react CaO with CO2 to produce CaCO3, at least one CaCO3 storage container (2) for receiving and storing the CaCO3 produced in the carbonator (1), wherein the CaCO3 storage container (2) is configured to be transportable such that the CaCO3 can be supplied to a geographical location (3) remote from the carbonator (1) for CO2 release.
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