Estonia has delivered its largest heat storage facility, begun construction on its largest solar-plus-storage hybrid project, and is preparing to break ground on an 800 MWh battery park in Valga County, set to become the largest in the Baltics. The JV between Estonian energy company Evecon, French solar PV developer Corsica Sole, and asset manager Mirova will develop the 2-hour duration systems, with. Diotech OÜ and Transcom AS will commence construction in February 2026 of a 100 MW / 200 MWh battery energy storage system (BESS) facility in Tsirguliina, Valga County. From ESS News French investment fund Mirova and. The government of Estonia will financially back a 500MW pumped hydro energy storage project to meet the country's need for long-duration energy storage, as the Baltics prepare to disconnect from Russia's grid this weekend. At the end of January, the coalition government of Estonia announced plans.