The Oxford Institute for Energy Studies says that the industry needs to focus on hydrogen storage due to limited investments and an uncertain profit model. They suggest large-scale storage in proven salt caverns, primarily in Poland, Germany, and the United Kingdom, with less potential in southern Europe. Underground storage of compressed hydrogen in lined rock caverns and depleted hydrocarbon fields is being explored, with contamination concerns requiring further study. Smaller-scale storage options like above-ground tanks, liquid hydrogen, and  

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