Ruien Energy Storage
Operating, 25 MW · 100 MWh, in Kluisbergen, owned by Nippon Koei Energy Europe and Aquila Clean Energy. Every fact below is as a published source states it, with the address beside it; a field not shown is one no source gave, and nothing is guessed.
The battery
| Power | 25 MW |
| Capacity | 100 MWh |
| Duration | 4.0 hours |
| Status | Operating, as of 19 October 2026 |
| Owner’s date | 7 March 2023, actual |
| Municipality | Kluisbergen, Ruien, East Flanders |
| Grid connection | Elia, Ruien 150 kV |
| Placed on the map | at the site itself, as mapped on OpenStreetMap (Batterijpark Ruien Energy Storage) |
Who is behind it
| Owner | Nippon Koei Energy Europe and Aquila Clean Energy |
| Developer | Yuso |
| Traded by | Yuso |
| Built by | Wärtsilä; SPIE (installation) |
Not published anywhere we have found: ultimate owner. The page says so rather than guessing.
In Elia’s list
Elia schedules this battery under the name below. Elia usually starts scheduling a battery when it begins testing, so the first day here is when it reached the grid, not when it began commercial operation.
| Elia’s name | First listed | Last listed | Power, as Elia lists it |
|---|---|---|---|
| Ruien Energy Storage | 22 May 2024 | still listed | 25 MW from 22 May 2024 |
Elia Transmission Belgium, open data dataset ods179, Elia Open Data Licence.
What the sources say
Yuso started and co-developed the project and optimises it for ten years; Nippon Koei Energy Europe and Aquila financed it jointly. Elia lists 25.1 MW. Not the same battery as Storm’s 200 MW project or the 100 MW Ruien II project, both being built at the same former power station site.
Evidence and sources
- owner: pv-magazine.com/press-releases/nippon-koei-energy-europe-and-aq…
- size: storage.wartsila.com/project/ruien-energy-storage
- more: aquila-capital.de/fileadmin/user_upload/PDF_Files_Pressemitteilun…
- position: openstreetmap.org/way/1462383022
From the owners’, developers’ and builders’ own releases and the trade press, read by Vitreous, joined to Elia’s list by name. This page carries no money: no Belgian body publishes what a named battery earns. List id BE-B01.