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Sizable energy’s technology: a new sustainable frontier
According to the International Energy Agency, the world will need 120 terawatt-hours of long-duration energy storage by 2040 — ten times more than what’s currently available. In this scenario, Italian startup Sizable Energy stands out with an innovative and sustainable solution.
A revolutionary offshore hydroelectric system
Sizable Energy has developed a reliable ocean-based energy storage system that can withstand even extreme marine conditions. At its core lies an offshore hydroelectric plant that uses marine brine in a closed circuit to generate electricity.
When energy needs to be fed into the grid, the brine flows downwards by gravity through reversible turbines, generating electricity efficiently. This system overcomes the geographic and environmental constraints that limit traditional onshore facilities.
System advantages and scalability
CEO and co-founder Dr. Manuele Aufiero emphasizes how the system enables gigawatt-scale energy storage, enhancing grid stability and resilience. The project’s modular design means it is ready to be used at an industrial level and faster to implement than conventional solutions.
International testing and validation
The technology has been successfully tested both in the lab and at sea. In September, the Maritime Research Institute Netherlands (MARIN) confirmed the system’s reliability under severe ocean conditions. The next trial is planned in Italy’s Mediterranean Sea, off the coast of Reggio Calabria.
Investments and global development
Sizable Energy recently raised $8 million to accelerate system development. The funding round was led by Playground Global from California, with participation from other investors, such as Exa Ventures, Verve Ventures, Satgana, Eden, Italian Angels Growth and Unruly Capital.
Thanks to this milestone, the startup aims to launch its first commercial projects in 2026, in collaboration with local partners and energy providers in various countries around the world.
