The EWE Gasspeicher Flow Battery Energy Storage System is a 120,000kW energy storage project located in Berlin, Germany. The rated storage capacity of the project is 700,000kWh.

The electro-chemical battery energy storage project uses flow as its storage technology. The project was announced in 2017 and will be commissioned in 2023.


The EWE Gasspeicher Flow Battery Energy Storage System is being developed by EWE and Friedrich Schiller University Jena.

Contractors involved

EWE and Friedrich Schiller University Jena are the developer of EWE Gasspeicher Flow Battery Energy Storage System.

Additional information

EWE Gasspeicher GmbH, a wholly owned subsidiary of the Oldenburg-based utility company EWE, plans to build the world’s largest battery by employing the well-known redox flow battery principle – in which electrical energy is stored in a liquid – along with new, environmentally friendly components in underground salt caverns. These kinds of caverns are currently used to store natural gas. EWE GASSPEICHER is collaborating on the project – brine for power (b4p for short) – with the Friedrich Schiller University in Jena, which developed the innovative components. It uses salt water and recyclable polymers (plastics).

About EWE

EWE AG (EWE) a subsidiary of Weser-Ems-Energiebeteiligungen GmbH, is an utility company. It operates in energy, telecommunication and information technology business areas. The company carries out generation and transmission of energy, gas storage and waste water treatment. EWE plans, builds and operates renewable power generation plants. The company constructs, acquires, and operates systems that store and inject gaseous and liquid fuels such as hydrogen, high-pressure natural gas, gas and compressed air, and liquefied petroleum gas, and provides related services. Its trading business supports wind and solar farms operators in marketing their electricity. The company has its operational presence in Germany, Poland and Turkey. EWE is headquartered in Oldenburg, Germany.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.