Mäntsälä (MW Storage)
Announced, 20 MW · 20 MWh, in Mäntsälä, owned by MW Storage AG. 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 | 20 MW |
| Capacity | 20 MWh |
| Duration | 1.0 hours |
| Status | Announced, as of 27 June 2024 |
| Municipality | Mäntsälä |
| Placed on the map | at the centre of Mäntsälä, its municipality (GeoNames) |
Who is behind it
| Owner | MW Storage AG |
| Built by | Fluence |
MW Storage AG (Swiss). YTJ lists MW Storage Nordic Oy, Nordic TWO Oy, Nordic THREE Oy and MW Storage Nokia Oy (all Tampere); no source says which holds Mäntsälä.
Not published anywhere we have found: ultimate owner, developer, cells. The page says so rather than guessing.
What the sources say
Fluence's own release (on ESS News, 27 Jun 2024): 20 MW / 20 MWh "close to Mäntsälä in Uusimaa", MW Storage's third Finnish project with Fluence; the first two are not identified. In Oct 2024 MW Storage announced two further 20 MW projects in southern Finland for 2026 (Energy-Storage.news), one possibly this one.
Evidence and sources
- name: https://www.ess-news.com/2024/06/27/mw-storage-and-fluence-deepen-partnership-to-deliver-t…
- status: https://www.ess-news.com/2024/06/27/mw-storage-and-fluence-deepen-partnership-to-deliver-t…
From the owners’, developers’ and builders’ own releases, council decisions and permit bulletins, read by Vitreous and checked against the owners’ own words on 12 October 2026; a bracket such as “(Energy-Storage.news only)” in a field means the trade press is still the only source for it. Fingrid publishes no meter, no price and no instruction per battery, so this page carries no money: what one megawatt is paid in Fingrid’s markets is on the markets page, for the whole market and never for a named battery. List id FI-B056.