The most powerful battery park complex in mainland Europe.
High-performance storage batteries help ensure energy independence.
The production of renewable energy has grown rapidly, and energy storage has become a strategic challenge in all European Union countries to ensure energy independence and help stabilize the power grid by balancing production and consumption. The jointly operated venture by Evecon, Corsica Sole and Mirova, managed by the Baltic Storage Platform, consisting of a 400 MWh battery park complex, helps to strengthen the stability and resilience of the Baltic countries’ integration with the European grid.
The battery park complex assists in regulating the grid frequency. In the event of an increase or decrease in grid frequency, the batteries quickly either store or produce electricity to balance the impact of the change. This technology enables the provision of various regulation services to the system.
The battery park complex, consisting of two independent battery parks, forms one of the largest battery park complex in continental Europe.
What it does?
- Provides fast power response to instant balancing needs : 0 to 100 % in a matter of seconds
- Provides energy reserve to deal with renewable power fluctuations
- Available 24/7
- Instant equivalent power of 90 000 households
- The available discharging power could supply more roughly 300 000 microwave ovens
- The amount of stored energy equals more than 7 millions iPhone batteries
When?
- The construction of the first battery park began in the third quarter of 2024 and was completed in the fourth quarter of 2025.
- The construction of the second battery park began in the second quarter of 2025 and was completed in the third quarter of 2026.
How big?
- 2 times 100 MW/200 MWh Equiv. 4x the current system in Belgium
- But reasonable footprint: 25 000 m2 each (3 football fields)
By who: Evecon, Corsica Sole and Mirova
Evecon is a key player in this transition. Alongside the battery energy storage systems, the fast-growing energy company has developed dozens of solar parks across Estonia, Latvia, and Lithuania, including Estonia’s largest solar park in Kirikmäe. In addition, Evecon is developing onshore wind farms and gas-fired power plants with a combined capacity exceeding 2,200 MW.
read more: evecon.ee
Corsica Sole is an independent solar power producer and a leading energy storage company in Europe. The company develops, finances, builds and operates its own renewable energy projects across France and Europe, combining renewable power generation with advanced grid flexibility solutions.
A pioneer in energy storage since 2009, Corsica Sole is also developing renewable hydrogen projects to harness surplus solar electricity and support the decarbonisation of energy uses.
read more: corsicasole.com
Mirova is a conviction-based, B Corp™* certified management company that offers its clients investment solutions combining the search for financial performance with environmental and social impact. Mirova has been active in the energy transition infrastructure sector for 20 years and has financed more than 1,000 projects for a total of over 7.3 GW of potential generation capacity across 48 countries.
read more: mirova.com
Construction
Construction of the Kiisa battery park
The 100 MW Kiisa battery park was connected to the grid on 1 October 2025. The facility became fully operational for providing grid services in the fourth quarter of 2025.
The battery park substation was the first in Estonia to connect to the electricity transmission network using a 330 kV AC underground cable, showcasing both innovation and sustainability in infrastructure development.
Construction of the Aruküla battery park
Construction of the 100 MW Aruküla battery park began in 2025 and was completed in the summer of 2026. Together with the Kiisa energy storage system, battery park complex has a total capacity of 200 MW and a storage capacity of 400 MWh, meeting a significant share of Estonia’s and the Baltic region’s battery energy storage needs.
Together, the Aruküla and Kiisa battery parks help regulate grid frequency and form one of the largest battery energy storage complexes in continental Europe.
Get in touch
Risto Virveste
Project manager
Antoine Stokking
Project manager