Sizable Energy
Updated: January 20, 2026
CEO - Manuele Aufiero
Country: Italy | Funding: $8M (+)
Founded: 2022
Website: https://sizableenergy.com/
Sizable Energy creates offshore pumped-storage hydroelectric power plants. Their modular, scalable ocean-based system enables low-cost long-term energy storage on a gigawatt scale by pumping saturated seawater brine (which is heavier than seawater) from the seafloor to a surface reservoir, harnessing the ocean's depth. In recovery mode, the brine flows downward under the influence of gravity, turning a power turbine. The design is simple and includes reservoir on the ocean floor, another floating on the surface, connecting pipe and reversible pumping turbines to pump the saturated seawater brine between the two reservoirs. The system is made from readily available materials that can be manufactured, assembled and installed at depths of 500 meters or more using existing offshore infrastructure. It can be linked to floating wind and solar power plants. Since only ocean water is used, the solution is environmentally sustainable.
Founded: 2022
Website: https://sizableenergy.com/
Sizable Energy creates offshore pumped-storage hydroelectric power plants. Their modular, scalable ocean-based system enables low-cost long-term energy storage on a gigawatt scale by pumping saturated seawater brine (which is heavier than seawater) from the seafloor to a surface reservoir, harnessing the ocean's depth. In recovery mode, the brine flows downward under the influence of gravity, turning a power turbine. The design is simple and includes reservoir on the ocean floor, another floating on the surface, connecting pipe and reversible pumping turbines to pump the saturated seawater brine between the two reservoirs. The system is made from readily available materials that can be manufactured, assembled and installed at depths of 500 meters or more using existing offshore infrastructure. It can be linked to floating wind and solar power plants. Since only ocean water is used, the solution is environmentally sustainable.
