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Elestor 50 kW Hydrogen-Bromide Flow Battery

The 2014 start-up Elestor hydrogen bromide (H-Br) flow battery is a fuel-cell and electrolyser at the same time.


– low cost/kWh. The larger the volume, the lower the cost.
– hardly any internal leaking. The charge is kept for an extremely long time
– power and capacity are decoupled. You can pick any desired kW/kWh-combination, depending on application
– long life-time. 10,000+ charge cycles have been demonstrated
– no long-term degradation battery


– lower energy density as Li-Ion (container for 50 kW)
– lower power density 0.8 Watts/cm3
– hydrogen-bromide is a dangerous substance

This flow battery is therefore not suitable for transport options.

Summary: very low cost, very reliable, bulky. Typical application: shabby gated industrial terrain, a lot of solar panels on the roof and a container-sized battery to guarantee 24 hours supply of electricity (provided the sun shines). The real upshot is that a mid-sized company or municipal area can consume all the kWh’s it generated with its own solar panels, for the time that feed-in tariffs will be a thing of the past.

After years of testing, Elestor has developed a 50 kW prototype that is ready for prime-time. First placing at the municipal warf of Emmeloord, 3 others in Duiven-NL near PV-park Gansenwoirt in Duiven begin 2019 and 2 systems in Germany, Essen and Mönchengladbach.

[] – Hydrogen bromide
[] – Hydrogen bromine battery
[] – Elestor company site

[] – MEGAWATerstof bromide flow BATTERIJ

Dutch government sponsored feasibility study for a 25 MW, 250 MWh battery, after building a 500 kW, 2.5 MWh pilot first (Q2-2020) for the company Vopak, specialized in storing and handling various oil, chemicals, edible oils and natural gas-related products. Expected storage cost for 25 MW, 250 MWh: €200/kWh. Li-Ion would be three times as expensive.

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