Eesti Energia is to build an energy storage device with a capacity of up to 53. 1MWh at the Auvere industrial complex in Estonia later this year, the company has confirmed. . Baltic Storage Platform, a joint venture (JV), has broken ground on two new 200MW/400MWh battery energy storage systems (BESS) in Estonia. The total project cost is US$7. Construction is set to begin this summer. . Estonia has laid the cornerstone for what will become the largest battery park in continental Europe, marking a crucial step toward synchronizing the Baltic power grids with the rest of Europe by 2025.