Ainola BESS (Piiparinmäki wind farm)
Operating, 30 MW · 41 MWh, in Pyhäntä, owned by Nuveen Infrastructure (majority), Ilmatar (10%). 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 | 30 MW |
| Capacity | 41 MWh |
| Duration | 1.4 hours |
| Status | Operating, as of 12 October 2026 |
| Owner’s date | June 2025, actual |
| Municipality | Pyhäntä |
| Grid connection | Next to the Murronkangas substation, in the Piiparinmäki wind farm |
| Placed on the map | at the centre of Pyhäntä, its municipality (GeoNames) |
Who is behind it
| Owner | Nuveen Infrastructure (majority), Ilmatar (10%) |
| Developer | Ilmatar (developer and constructor); co-developed with Glennmont Partners (now Nuveen Infrastructure) |
| Built by | Ilmatar (constructor); Alfen TheBattery Elements (Energy-Storage.news only) |
No source names the company that holds it. Possible project company in YTJ, by name only: Ainola Battery Storage Oy (3274915-5, former name Ilmatar Battery Oy, website ilmatar.fi).
Not published anywhere we have found: ultimate owner, cells. The page says so rather than guessing.
What the sources say
Ilmatar (18 Jun 2025): commercial operation reached. Ilmatar's project page gives Piiparinmäki, Pyhäntä, 30 MW / 41 MWh (corrected 12 Oct 2026: municipality had been blank).
Evidence and sources
- name: https://ilmatar.com/project/ainola-bess/
- owner: https://ilmatar.com/storing-clean-energy-ilmatars-first-battery-energy-storage-system-now-…
- developer: https://ilmatar.com/storing-clean-energy-ilmatars-first-battery-energy-storage-system-now-…
- builder: https://ilmatar.com/storing-clean-energy-ilmatars-first-battery-energy-storage-system-now-…
- status: https://ilmatar.com/project/ainola-bess/ https://ilmatar.com/storing-clean-energy-ilmatars…
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-B010.