Merus Power test storage, Lempäälä
Operating, 1 MW · 1 MWh, in Lempäälä, owned by Merus Power. 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 | 1 MW |
| Capacity | 1 MWh |
| Duration | 1.0 hours |
| Status | Operating, as of 25 March 2025 |
| Owner’s date | 25 March 2025, actual |
| Municipality | Lempäälä |
| Placed on the map | at the centre of Lempäälä, its municipality (GeoNames) |
Who is behind it
| Owner | Merus Power |
| Developer | Merus Power |
| Built by | Merus Power |
| Business ID | 2230775-9 |
YTJ, by exact name: Merus Power Oyj. https://avoindata.prh.fi/opendata-ytj-api/v3/companies?businessId=2230775-9
Not published anywhere we have found: ultimate owner, cells. The page says so rather than guessing.
What the sources say
Built for product development; trades on the wholesale and Fingrid frequency markets.
Evidence and sources
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-B006.