AKKU One
Being built, 125 MW · 300 MWh, in Lapinlahti, owned by Covenergo (majority) with Delta Capacity. 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 | 300 MWh |
| Duration | 2.4 hours |
| Status | Being built, as of 5 October 2026 |
| Owner’s date | 2027 Q4, expected |
| Municipality | Lapinlahti |
| Placed on the map | at the centre of Lapinlahti, its municipality (GeoNames) |
Who is behind it
| Owner | Covenergo (majority) with Delta Capacity |
| Developer | Helios Nordic Energy |
| Built by | Delta Capacity (EPCM); NYAB (balance of plant); Sungrow (battery system); Rejlers (technical support); Ampner (grid studies); GreenPowerMonitor (EMS and SCADA) |
Covenergo (Czech) majority with Delta Capacity (Swiss). No Finnish company for AKKU One found by name in YTJ.
Not published anywhere we have found: ultimate owner, cells. The page says so rather than guessing.
What the sources say
Delta Capacity (17 Sep 2026): construction under way, commissioning targeted for Q4 2027; bought ready to build from Helios Nordic Energy. Energy-Storage.news (9 Oct 2026) said Q4 of this year; the owners' release says Q4 2027. Centrica Energy partial toll (5 Oct 2026).
Evidence and sources
- name: https://www.deltacapacity.com/post/covenergo-and-delta-capacity-partner-on-125-mw---300-mw…
- status: https://www.deltacapacity.com/post/covenergo-and-delta-capacity-partner-on-125-mw---300-mw…
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-B023.