The Ruien Battery Energy Storage System is a 25,000kW energy storage project located in Ruien, East Flanders, Belgium.

The project was announced in 2018 and will be commissioned in 2021.


The Ruien Battery Energy Storage System is being developed by Ruien Energy Storage. The project is owned by Ruien Energy Storage (100%), a subsidiary of Nippon Koei.

The key application of the project is frequency control ancillary services.

Contractors involved

Ruien Energy Storage is the owner. Ruien Energy Storage is the developer.

Nippon Koei is the EPC contractor for the project.

Additional information

Ruien Energy Storage NV (RES NV) is a joint venture between Nippon Koei Co. Limited (NK) and Yuso BVBA (YUSO). The BESS targets to deliver ancillary services to European grid operators (TSOs) as well as more localized energy service offerings at the site of the former 800 MW coal fired power plant currently under post-decommissioning redevelopment. The capacity of the energy storage installation will be 25 MW with the option to enlarge its size later. The project leverages on the grid connection infrastructure available at the HV substation operated by the Belgian TSO Elia.


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.