Antares
Operating, 100 MW · 200 MWh, in Waddinxveen, owned by Return. 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 | 100 MW |
| Capacity | 200 MWh |
| Duration | 2.0 hours |
| Status | Operating, as of 20 October 2026 |
| Stated date | 5 October 2026, commercial operation announced |
| Municipality | Waddinxveen, Zuid-Holland |
| Grid connection | TenneT 150 kV |
| Placed on the map | at the site itself, as mapped on OpenStreetMap (unnamed) |
| How sure | A dated source confirms it |
Who is behind it
| Owner | Return |
| Traded by | Vattenfall (long-term offtaker / optimiser) |
| Built by | Alfen (BESS); SPIE Nederland (technical execution) |
What the sources say
Running since 5 October 2026 per Energy-Storage.news (8 October 2026). Vattenfall's own release (24 April 2025) describes 50 MW / 100 MWh; Energy-Storage.news (25 April 2025) reports Return, Alfen and Vattenfall on a single 100 MW / 200 MWh project and Return lists one Waddinxveen asset, so the Vattenfall figure is treated as Vattenfall's contracted share, not a second battery. Confirmed: dated source says it runs.
Evidence and sources
- source: energy-storage.news/return-puts-netherlands-largest-bess-online
- source: return.energy/locations
- source: group.vattenfall.com/press-and-media/pressreleases/2025/vattenfall-s…
- source: ess-news.com
- source: energy-storage.news/tag/netherlands/page/3
- position: openstreetmap.org/way/1474649059
From the owners’, developers’ and builders’ own releases, grid operators’ and permit notices and the trade press, read by Vitreous. No Dutch body publishes a meter, an instruction or a payment for a named battery, so this page carries none. List id NL-B01.