Elestor B.V., established in 2014 in Arnhem, Netherlands, develops and manufactures large-scale energy storage solutions using hydrogen bromine (HBr) flow battery technology. The company specializes in creating affordable, scalable storage systems designed for utilities and energy providers. Their innovative approach focuses on integrating renewable energy sources like solar and wind power into existing grids, supporting the transition to sustainable energy systems.
Elestor’s solutions aim to replace conventional power plants with sustainable alternatives that minimize environmental impact. Under new leadership starting January 2025, the company is transforming from its research-focused origins into an engineering-driven commercial enterprise.
Battery Technology
Elestor’s proprietary HBr flow battery technology operates through a closed system utilizing hydrogen and bromine, both abundant materials that ensure cost-effective production and environmental sustainability. The system consists of two tanks storing hydrogen gas and an aqueous HBr/Br2 solution, which interact through a membrane during charge and discharge cycles.
The technology offers several advantages for industrial applications. The batteries provide up to 10,000 charge/discharge cycles, demonstrating exceptional durability for long-term operation. The scalable design allows for customization based on specific storage requirements, while the use of bromine extracted from seawater ensures virtually unlimited material supply.
Integration with hydrogen production through electrolysis creates additional efficiency benefits, allowing for continuous and optimal use of electrolyzers. This combination makes the system particularly effective for large-scale, long-duration energy storage applications.
Recent Projects
In late 2024, Elestor announced a significant leadership transition, with COO Hylke van Bennekom set to become CEO on January 1, 2025, replacing Guido Dalessi. The company has also strengthened its executive team by appointing Pieter Pijper as CFO in August 2023.
A notable achievement includes the activation of their first commercial HBr flow battery installation. Additionally, Elestor formed strategic partnerships with Vopak to scale up storage capacity from 200 kWh to 3,000 kWh, and with ITMGroup to develop a 400 kW power system with 1 MWh storage capacity.
Investors
Elestor has secured €30 million in funding from prominent investors. The investment group includes Equinor Ventures, Invest-NL, Royal Vopak (through Vopak Ventures), and Somerset Capital Partners. Existing shareholders EIT InnoEnergy and Enfuro Ventures continue their support. The company’s estimated value ranges between $132 million and $198 million as of August 2022.
Business Details
Location: Arnhem, Netherlands
Website: https://elestor.com
LinkedIn: https://www.linkedin.com/company/elestor-b-v-/
