Elestor

Arnhem, Gelderland, Netherlands

About

Elestor is a Dutch company developing a hydrogen-iron flow battery for large-scale, long-duration electricity storage.

Wiebrand Kout founded it in 2014 and was joined by Guido Dalessi the following year; Hylke van Bennekom, now CEO, joined in 2021. Elestor chose hydrogen and iron as active materials because both are cheap and widely available, aiming for the lowest possible storage cost per MWh; it also assessed a hydrogen-bromine design. It presents its systems as long-duration storage plants that can take over from coal-, gas- and oil-fired power stations, and in 2026 won the Hydrogen Innovation Award for the technology.

The 2025 Battery Report lists Elestor among Europe's flow battery players and notes an investment award for an Elestor project.

From the Battery Report

Battery Report 2025 · chapterApplications: Stationary Energy StorageVolta Foundation's annual report on this part of the battery industry.

Supply Chain Segments

Energy Stationary Storage (ESS)

Battery Chemistries

Flow Batteries

Location Info

HQ: Arnhem, Gelderland, Netherlands

Sources

Where the details on this profile come from.

Headquarters: Arnhem, Gelderland
- elestor.com · Company site · checked Oct 2026“Visiting address Westervoortsedijk 73 (Building BF) 6827 AV Arnhem The Netherlands”
What they do: Energy Stationary Storage (ESS)
- Battery Report 2025, p.405 (Metal-Air/Flow Batteries, Industry Players: Europe) · Battery Report · checked Oct 2026

Quick Facts

Last Updated: Oct 16, 2026

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