Solarigo takes a major step in energy storage – turnkey BESS solution for the Honkisaarenneva solar park

Solarigo Systems Oy has signed an agreement with Swedish company Byhmgard AB to deliver a large-scale Battery Energy Storage System (BESS) for Honkisaarenneva Solarpark Oy. The system will be integrated into a 34.35 MWp solar power plant in Kuortane, Finland. The project further strengthens Solarigo’s role as a developer and implementer of flexible energy infrastructure in Finland.

The energy storage system integrated into the Honkisaarenneva solar park will have a power capacity of 15 MW and an energy capacity of 36 MWh. The BESS will significantly enhance the plant’s ability to participate in electricity grid balancing and support system stability.

The solar park is being built on a former peat production site, helping turn decommissioned peatlands into clean solar electricity. With the addition of energy storage, Honkisaarenneva will also be Finland’s first hybrid solar and BESS project built on a former peat bog. The Finnish Ministry of Economic Affairs and Employment has granted the project investment support via the EU’s RENEWFM mechanism.

Solarigo Systems Oy will deliver the project as a full turnkey EPC solution. The scope includes project management, engineering, energy storage delivery, transformers, as well as electrical, foundation and civil works. The system consists of 12 integrated battery units and three medium-voltage transformers. Delivery and commissioning will follow an accelerated schedule, with grid connection and commercial operation targeted for 2026.

The BESS will be connected to Fingrid’s 110 kV transmission network via a substation built as part of the solar power project. The system’s primary function is to provide frequency control and restoration services, enabling more efficient integration of renewable energy while supporting the stability of Finland’s electricity system.

Solarigo develops energy storage solutions alongside its own solar power plants and also delivers BESS projects for its customers. This project represents an important step for Solarigo toward increasingly flexible and intelligent energy solutions, where solar power and energy storage work seamlessly together. At the same time, the project supports Finland’s and Europe’s broader climate and energy transition goals.

Energy storage is a key focus both in our own solar parks and in the solutions we deliver to our customers. The Honkisaarenneva project demonstrates how we build intelligent energy systems where solar power and storage complement each other and strengthen the overall performance of the electricity system.”

Antti Koskelainen, CEO, Solarigo Systems Oy