Construction of the project is now under way, with commissioning targeted for Q4 2027.
As wind and solar capacity expands, power systems are experiencing more periods of oversupply and greater price volatility, while requiring additional flexibility to respond within seconds and keep supply and demand balanced. This is a challenge that is increasingly shared across European power markets, not only in Finland.
In Finland, this need is reinforced by the scale of Olkiluoto 3, the country's largest single generating unit. Its size increases the potential impact of a sudden production outage on the Finnish and Nordic power systems. Fingrid therefore maintains reserve products designed to respond rapidly to major disturbances, a role for which battery storage is technically well suited.
AKKU One responds to this challenge by providing fast-responding flexibility to the Finnish power system. The project was acquired as a ready-to-build (RTB) asset from Helios Nordic Energy. It is expected to support frequency regulation and balancing services as Finland continues to integrate growing volumes of wind and solar generation.
Covenergo, as majority owner, brings extensive experience in renewable energy development, project finance and long-term asset value creation across its European portfolio. Delta Capacity contributes its Nordic execution and battery storage expertise, taking responsibility for securing offtake, construction and long-term asset management as EPCM contractor, in close cooperation with Covenergo’s team.
The project marks Delta Capacity’s second battery storage project in Finland, building on the company’s expanding presence across the Nordic region following the completion of the 70 MW/160 MWh Ånge BESS in Sweden earlier this year. The project represents an important step in both companies’ continued expansion into large-scale flexible energy assets and further strengthens their strategic presence in the Nordic energy market.
“This partnership and acquisition is an important step forward for Covenergo's flexible asset portfolio and reinforces our growing footprint in the Nordic energy market” said František Kalivoda, CEO of Covenergo. “We remain fully committed to delivering high-quality, investment-ready projects that support Europe's energy transition.
A Nordic delivery team is supporting construction and future operations. Rejlers, a Nordic engineering consultancy, is providing technical project support throughout construction. Sungrow, a global leader in battery energy storage technology, will supply the project’s battery system, following the 1 GWh framework agreement signed with Delta Capacity earlier this year.
NYAB is delivering Balance of Plant works, Ampner is carrying out grid connection studies and compliance verification, and GreenPowerMonitor, a DNV company, will provide the energy management and SCADA systems for real-time monitoring and control once AKKU One is operational.
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