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  "documentTitle": "Hydrogen applications and business models",
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      "text": "Overview of technology diagram showing salt dome storage",
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      "text": "Cons: Geographical specificity, large size, and minimum pressure requirements; Less suitable for short-term and smaller-scale storage",
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      "text": "Pros: Allows for high-volume storage at lower pressure and cost; Seasonal storage; Low risk of contaminating the stored hydrogen",
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      "text": "Description: Hydrogen gas is injected and compressed in underground salt caverns, which are excavated and shaped by injecting water into existing rock salt formations. Withdrawal and compressor units extract the gas when required. Salt caverns have been used for hydrogen storage by the chemical sector in the United Kingdom since the 1970s and the United States since the 1980s. Depleted oil and gas reservoirs are typically larger than salt caverns, but they are also more permeable and contain contaminants. Water aquifers are the least mature of the three geological storage options. There is mixed evidence for their suitability, although they were used for years to store town gas with 50–60% hydrogen.",
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      "kind": "source-note",
      "text": "Sources: \"The Future of Hydrogen,\" International Energy Agency, June 2019; \"National Hydrogen Roadmap,\" Commonwealth Scientific and Industrial Research Organisation, 2018; Praxair (2009); Kearney Energy Transition Institute analysis",
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      "text": "Key feature estimates: Current cost estimate ($ per kgH2) < 0.6; Typical size 1–1,000 GWh; Volumetric density (kWh/m3) 65 (at 100 bar); Efficiency (%) 90–95%",
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