Callio

BESS project moving into commissioning phase

At the Callio energy park, our solar + battery hybrid project is progressing steadily. The transformer and battery containers (BESS) are in place in March 2026. After this milestone we move into the installation and commissioning phase during the spring.

Civil works for the battery energy storage system in progress

The civil works phase for the battery energy storage system will be completed in March 2026. The project will then proceed with the delivery and installation of the battery system.

Battery energy storage system (BESS) to enhance the Callio solar park

Solarigo is further developing the Callio solar park by integrating a battery energy storage system. The project is one of the first hybrid solutions in Finland, combining a 13 MWp solar park and a 4 MW / 8 MWh battery energy storage system into one optimized entity.

The objective is to maximize the system’s ability to participate in electricity markets while supporting the stability and flexibility of the energy system.

Opening ceremony

The opening ceremony of the Callio solar park was celebrated on September 2 in a warm and festive atmosphere. The event was organized together with the City of Pyhäjärvi and Skarta, and it gathered a wide range of guests eager to explore the new solar park. Attendees enjoyed delicious soup and traditional coffee with pastries, while being introduced to the park and engaging in discussions about the role of renewable energy for the region and its future.

Commissioning

Callio Solar Power Park received a commissioning permit in June 2024.

Building permit for Callio

Callio, more specifically Callio Energy Park, I received a building permit in December 2023. The picture is an illustrative picture of the solar park.

Panel installations complete in Callio

The solar panel installations were completed on schedule six months after the construction of the PV plant began.

Callio’s construction

The construction of the Callio solar power plant’s foundations began in April 2024, and panel installation commenced in June 2024.

Solarigo Systems Oy is responsible for the construction of the Callio solar power plant.

NextGeneration EU

The Ministry of Economic Affairs and Employment supported the project by granting 12.1 million euros of NextGeneration EU support, as outlined in the EU’s recovery and resilience plan, to the project company Callio-Hitura Solarpark Oy.

Design

The exact technical planning of the Callio and Hitura solar parks began in April 2022. Additionally, the preparation and approval of the permit processes for the solar parks have begun.

Development

The project was launched in close collaboration with the City of Pyhäjärvi, Pyhäsalmi Mine Oy, and the Callio Energy Park initiative, as well as with the City of Nivala and the owner of the Hitura mine site.

In both Callio and Hitura, the planning focused on repurposing decommissioned mine tailings ponds. These former industrial sites are unsuitable for conventional construction but offer ideal conditions for lightweight structures, such as solar power plants, turning unused land into sources of clean, renewable energy.