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In line with the planning of actual storage sites in depleted gas fields, the insights into CO2 storage methods have evolved rapidly in recent years. This study provides an updated assessment of the offshore storage capacity in (nearly) depleted gas fields, its temporal development at a portfolio level, and a matching exercise with the CO2 transport projects currently in development. The storage capacities in this study are calculated following the resource pyramid methodology to arrive at a ‘practical’ storage capacity, i.e. a storage capacity that is considered to be achievable in practice (e.g. Bachu, 2007 ). Results show a practical storage capacity between ∼1260 and ∼1750 Mt (Mega tons) in 46 and 124 storage sites respectively. The potential development of available storage capacity over time at portfolio level shows it can absorb the currently planned CO2 transport capacity.