Elestor

Elestor, based in Arnhem, develops flow batteries that store renewable electricity for many hours at a time. Its current design is a hydrogen-iron flow battery.

Elestor works on this long-duration storage at the scale of wind farms. With Windpark Zeewolde it is developing a project to store wind power for ten to forty hours. Its backers include Equinor, EIT InnoEnergy, Invest-NL and Vopak, and in October 2026 it won the Dutch Waterstof Innovatie Award.

NEON chose Elestor for a reason that was written into the programme's founding plan. The plan argued that investment in the Netherlands goes to technologies with the shortest time to market, and that technologies which could become cheaper and more popular in the long run, flow batteries among them, receive too little funding. Elestor's "liquid batteries" were one of the breakthrough technologies NEON set out to value on their long-term merits.

Within NEON, Elestor was a partner of the integral model, the work package that combines all technologies into quantified scenarios for the Dutch energy system, storage included.