FlexCHESS is an HORIZON EU project that aims to revolutionise the existing paradigms of energy storage by developing a multi-level flexibility approach based on Virtual Energy Storage System (VESS) that can store surplus energy through hybrid energy storage systems (HESS) and modify their behavior and architecture to support unpredictable growth and change of demand, climate and market. FlexCHESS will enhance the innovation storage capacity and competitiveness of the smart grids in Europe based on VESS-centric approaches to address uncertainties and weaknesses related to the extensive integration of variable renewable energies into the electricity market. This will be achieved by the appropriate promotion of open innovations and making the smart technologies an asset for an intelligent business. FlexCHESS project has received funding from the European Union’s Horizon Europe research and innovation programme under the grant agreement No 101096946. This publication reflects only the author’s view, and the EC is not responsible for any use that may be made of the information it contains.