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The secure storage of energy and carbon dioxide in subsurface geological formations plays a crucial role in transitioning to a low-carbon energy system. The suitability and security of subsurface storage sites rely on the geological and hydraulic properties of the reservoir and confining units. Additionally, their ability to withstand varying thermal, mechanical, hydraulic, biological and chemical conditions during storage operations is essential. Each subsurface storage technology has distinct geological requirements and faces specific economic, logistical, public and scientific challenges. As a result, certain sites can be better suited than others for specific low-carbon energy applications. This Special Publication provides a summary of the state of the art in subsurface energy and carbon dioxide storage. It includes 20 case studies that offer insights into site selection, characterization of reservoir processes, the role of caprocks and fault seals, as well as monitoring and risk assessment needs for subsurface storage operations.