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Developed within HYSTORIES project, our modelling approach estimates the dynamic capacities of 21 traps throughout Europe. The synthetic modelling approach used demonstrated consistency with the site models under similar operational constraints. Several storage cycles are necessary to estimate the hydrogen working. It was shown that the first cycles are usually not appropriate to estimate the working gas capacity. The consistency between static and dynamic capacity relies heavily on the model assumptions, specifically the regional extension of the aquifer. The synthetic models used in this study represent of course idealized conditions of a given traps. However, the approach allows a conservative estimate of the hydrogen storage capacity. They are based upon a minimal set of information for the traps. The static capacity is more consistent with the dynamic capacity of depleted gas fields than with the deep saline formations.