Sizable Energy, co-founded by Manuele Aufiero, is pioneering a new approach to energy storage by adapting pumped-storage hydropower technology for ocean use. The startup recently raised $8 million in funding to develop a system featuring two flexible reservoirs—one floating and one submerged—connected by turbines. This innovative design allows for the storage of energy by pumping super salty water from the seabed to the surface when electricity is cheap. When energy is needed, the heavier salty water flows back down, generating electricity. This method aims to streamline production and reduce costs, potentially delivering energy storage at €20 per kilowatt-hour, significantly cheaper than traditional grid-scale batteries. Sizable plans to deploy several commercial projects by 2026, enhancing the resilience of energy grids and supporting the integration of renewable energy sources.