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      "text": "Pressurized tanks need a high operational cycling rate to be economically feasible.",
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      "text": "Outdoor storage infrastructure consisting of bulk storage tank, compression pumps, and gaseous storage tubes",
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      "text": "Cons: Low volumetric and gravimetric density, resulting in large and heavy tanks, Low storage capacity per vessel",
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      "text": "To increase its energy density, hydrogen can be compressed and stored in pressurized vessels, mainly tanks, but also bottles. In general, pressurized tanks operate at pressures ranging from 200 to 700 bar. Tanks storage compressed or liquefied hydrogen have high discharge rates and efficiencies, making them appropriate for smaller-scale applications where a local stock of fuel or feedstock needs to be readily available. Pressurized tanks need a high operational cycling rate to be economically feasible. If the storage time, relative to the power rating, increases beyond a few days, the capital costs of vessels and compressors become a drawback for this technology. Research is continuing with the aim of finding ways to reduce the size of tanks for densely populated areas.",
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      "text": "Pros: Mature technology, Fast charge and recharge time, Easy to transport",
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      "text": "Current cost estimate: $6,000–$10,000",
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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; Kearney Energy Transition Institute analysis",
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      "text": "Key feature estimates: Current cost estimate ($6,000–$10,000 per MWh), Typical size (100 kWh–10 MWh per tank), Volumetric density (670–1,300 kWh/m3), Efficiency (89–91% at 350 bar; 85–88% at 700 bar)",
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