{"id":31796,"date":"2025-10-23T12:22:38","date_gmt":"2025-10-23T12:22:38","guid":{"rendered":"https:\/\/metaverseplanet.net\/blog\/?p=31796"},"modified":"2026-01-05T12:28:51","modified_gmt":"2026-01-05T12:28:51","slug":"storing-electricity-in-the-ocean-the-next-generation-sea-battery-technology","status":"publish","type":"post","link":"https:\/\/metaverseplanet.net\/blog\/storing-electricity-in-the-ocean-the-next-generation-sea-battery-technology\/","title":{"rendered":"Storing Electricity in the Ocean: The Next-Generation \u201cSea Battery\u201d Technology"},"content":{"rendered":"\n

Sizable Energy<\/strong> aims to revolutionize energy storage<\/strong> with a pumped-storage hydropower system<\/strong> designed to operate on the seabed<\/strong>. The company targets starting commercial projects<\/strong> by 2026<\/strong>.<\/p>\n\n\n\n

Pumped-storage hydropower<\/strong> technology has been around for nearly a century. In this system, water is constantly filled and emptied. Water is pumped up when electricity is cheap, and when there is a need for energy, the water flows down to turn turbines<\/strong>. A new startup named Sizable Energy<\/strong> aims to revolutionize energy storage<\/strong> by taking the logic of land-based hydroelectric power plants to the ocean<\/strong>.<\/p>\n\n\n\n

According to the International Energy Agency (IEA)<\/strong>, pumped-storage hydropower facilities worldwide can store 8,500 gigawatt-hours<\/strong> of electricity. However, this system has a drawback: the number of geographically suitable locations for pumped-storage hydropower on land is quite limited<\/strong>. Sizable Energy<\/strong> developed the idea of moving the technology from land to sea to solve this problem.<\/p>\n\n\n\n

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Technology Moves from Land to Sea<\/strong><\/h2>\n\n\n\n
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Founded on this idea, Sizable Energy<\/strong> recently secured $8 million<\/strong> in funding led by Playground Global<\/strong>, with participation from EDEN\/IAG<\/strong>, Exa Ventures<\/strong>, Satgana<\/strong>, Unruly Capital<\/strong>, and Verve Ventures<\/strong>.<\/p>\n\n\n\n

The system developed by the company works with a mechanism that uses a sea salt solution<\/strong>\u2014about 20% denser<\/strong>\u2014instead of fresh water and dams. This saltwater moves between a floating reservoir<\/strong> and a deep-water reservoir<\/strong>. By utilizing gravity<\/strong> and ocean depth<\/strong>, it can store and release gigawatt-scale energy<\/strong> without the environmental impact and land-use requirements of land-based hydro projects. Operating on the seabed<\/strong> eliminates the necessity of designing a new concrete dam every time, as is required on land. Consequently, this approach makes the system suitable for mass production<\/strong>.<\/p>\n\n\n\n

Sizable<\/strong> first tested its technology in wave tanks<\/strong> and then off the coast of Reggio Calabria, Italy<\/strong>. The company is now preparing for the pilot installation of the floating components. The goal is to commission a full-scale demonstration facility<\/strong> by 2026<\/strong> and then move on to commercial projects<\/strong> worldwide.<\/p>\n\n\n\n

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Just 20 Euros per kWh<\/strong><\/h2>\n\n\n\n
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In the full-sized system, each turbine<\/strong> will generate 6-7 megawatts<\/strong> of power, with one turbine located every 100 meters<\/strong> of pipeline. In areas 500 meters or deeper<\/strong>, a higher energy storage capacity<\/strong> will be achieved as the weight of the water increases. Each commercial facility will house multiple reservoirs, and the system’s energy storage cost<\/strong> will be approximately 20 euros<\/strong> (about $23<\/strong>) per kilowatt-hour (kWh)<\/strong>. This translates to about a tenth of the cost<\/strong> compared to grid-scale batteries<\/strong>. The technology is also suitable for integration with offshore wind farms<\/strong>. Sharing the same power line to the shore could reduce costs even further.<\/a><\/a><\/p>\n\n\n\n

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