Covenergo and Delta Capacity have begun construction on AKKU One, a standalone 125MW/300MWh battery energy storage system (BESS) in Lapinlahti, Finland, with commissioning targeted for the fourth quarter of 2027.
Covenergo, a renewable energy services provider, holds majority ownership of the project and is responsible for project finance and long-term asset value creation.
Delta Capacity, a Swiss-based developer and operator of utility-scale battery storage systems, is acting as engineering, procurement, construction and management (EPCM) contractor, taking responsibility for securing offtake, construction and long-term asset management.
AKKU One was acquired as a ready-to-build asset from Helios Nordic Energy. The project marks Delta Capacity’s second battery storage project in Finland, and it also completed the 70MW/160MWh Ånge BESS in Sweden earlier this year.
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František Kalivoda, CEO of Covenergo, said the acquisition reinforces the company’s growing footprint in the Nordic energy market.
“We remain fully committed to delivering high-quality, investment-ready projects that support Europe’s energy transition,” Kalivoda said.
Patrik Hes, CEO of Delta Capacity, said the project builds on the company’s track record in the region.
“We’re proud to bring the same speed and execution that delivered Ånge to our new project in Finland,” Hes said.
A Nordic delivery team is supporting construction. Rejlers, a Nordic engineering consultancy, is providing technical project support throughout construction, while NYAB is delivering balance-of-plant works and Ampner is carrying out grid connection studies and compliance verification.
Sungrow will supply the project’s battery system, under a 1GWh framework agreement it signed with Delta Capacity earlier this year. GreenPowerMonitor, a DNV company, will provide energy management and SCADA systems for real-time monitoring once the project is operational.
Once operational, AKKU One will provide flexibility to Finland’s power system, supporting frequency regulation and balancing services as the country integrates growing volumes of wind and solar generation.
Delta Capacity’s Nordic pipeline extends beyond AKKU One
AKKU One is one of several projects Delta Capacity has under way in the region. The company has entered into a partial tolling agreement with Centrica Energy for the 125MW/300MWh Karppio project in Teuva, Finland, also acquired from Helios Nordic Energy, this time alongside family investment office Strioga Family Foundation.
Centrica Energy already trades output from Delta Capacity’s Ånge project, which the developer has described as the largest battery storage facility in the Nordics.
Delta Capacity brought the Ånge project online in June, completing it from procurement to commercial operation within 15 months, a joint venture with Czech investment bank WOOD & Company’s Renewables Sub-Fund.
Delta Capacity has said it has nearly 1GWh of battery storage under construction and is targeting more than 6GWh of flexible assets in operation across the Nordics by 2030.
Grid-forming compliance has emerged as a defining engineering requirement for large-scale Nordic battery projects.
Hitachi Energy, which is supplying the power conversion system for a separate 125MW/250MWh BESS under construction in Haapajärvi, Finland, has said projects in the region must be built to withstand low temperatures, high humidity, snow and ice, while meeting increasingly stringent grid code requirements set by Finland’s transmission system operator, Fingrid.
Hitachi Energy’s head of power conversion solutions, Alberto Prieto, has said the exact revenue mix available to Finnish battery storage projects is still evolving, spanning ancillary services, wholesale arbitrage and cross-border balancing within the shared Nordic electricity market.
