Sirius
Being built, 200 MW · 800 MWh, in Winschoten, 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 | 200 MW |
| Capacity | 800 MWh |
| Duration | 4.0 hours |
| Status | Being built, as of 20 October 2026 |
| Stated date | 2027, Q4 2027 |
| Municipality | Winschoten, Oldambt, Groningen |
| Grid connection | TenneT, time-dependent transport right; TenneT Meeden |
| Placed on the map | at Winschoten, the place its source names (GeoNames) |
| How sure | A dated source confirms it |
Who is behind it
| Owner | Return |
| Traded by | Vattenfall (long-term fixed-price toll) |
| Built by | Huawei (batteries); Hanab and Omexom (construction consortium) |
What the sources say
Location conflict: trade press says Winschoten, Return says Meeden (the substation). Return's own page labels it under construction, but no dated source confirms construction work. Investment about EUR 180m.; Financial close confirmed 1 September 2026. Return's live page (read 20 October 2026) says Under Construction but is undated. Return’s locations page lists it as being built.
Evidence and sources
- source: solarmagazine.nl/nieuws-zonne-energie/i44649/gigabatterij-van-80…
- source: energy-storage.news/return-financial-close-vattenfall-toll-800mwh-d…
- source: return.energy/locations
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-B33.