AQUABATTERY specializes in an acid-base (saltwater) flow battery that stores electrical energy through a reversible chemical process. The battery charges by dissociating saltwater into acid and base solutions stored separately, and discharges by recombining them to generate electricity and regenerate the saltwater. It uses abundant, non-toxic materials like table salt, water, acid, and base, avoiding metals such as lithium, cobalt, and vanadium. The technology allows independent scaling of power and energy, is non-flammable, non-toxic, fully recyclable, and suited for flexible, cost-effective, long-duration energy storage.
Saltwater flow batteries designed for large-scale energy storage applications with flexible power and energy scaling capabilities, suitable for 8 hours to multi-day or seasonal storage needs. The products use sustainable, safe, and affordable materials and processes.
In 2024, AQUABATTERY launched Europe’s largest saltwater flow battery pilot project at Deltares’ campus in Delft to validate performance and prepare for commercial deployment in 2026. The company received the Innovation award at the 2025 European Sustainable Energy Awards (EUSEW) for its sustainable, affordable, and scalable long-duration storage system.
AQUABATTERY closed a €6M seed funding round in 2024 led by EIT InnoEnergy with participation from InnovationQuarter, Invest-NL, Init Power, and angel investors. It also received a €2.5M grant from the European Innovation Council Accelerator in 2022 and additional support from the Dutch National Growth Fund in 2023 to advance material independence and circular battery development.
