Haapajärvi (Pysäysperä)
Being built, 125 MW · 250 MWh, in Haapajärvi, owned by Alpiq. 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 | 125 MW |
| Capacity | 250 MWh |
| Duration | 2.0 hours |
| Status | Being built, as of 11 December 2025 |
| Owner’s date | 2027 H1, expected |
| Municipality | Haapajärvi |
| Placed on the map | at the centre of Haapajärvi, its municipality (GeoNames) |
Who is behind it
| Owner | Alpiq |
| Developer | Pohjan Voima Oy (Arise subsidiary) |
| Built by | Nordic Electro Power (system integrator); Hitachi Energy (power conversion, transformers, controls) |
No source names the company that holds it. Possible project company in YTJ, by name only: Haapajärven Tasapainotus Oy (3428815-3, former name Pysäysperän Sähkövarasto Oy).
Not published anywhere we have found: ultimate owner, cells. The page says so rather than guessing.
What the sources say
Pysäysperä project. Alpiq (11 Dec 2025): under construction, owned and operated by Alpiq, operational in the first half of 2027. Hitachi Energy (Dec 2025) said mid-2027.
Evidence and sources
- name: https://www.hitachienergy.com/se/sv/news-and-events/press-releases/2025/12/fi-hitachi-ener…
- owner: https://www.alpiq.com/newsroom/media-releases/alpiq-expands-its-project-portfolio-for-batt…
- developer: https://www.arise.se/en/node/1442
- status: https://www.alpiq.com/newsroom/media-releases/alpiq-expands-its-project-portfolio-for-batt…
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-B020.