Summary: Bulgaria is emerging as a strategic hub for home energy storage battery production, driven by renewable energy adoption and EU sustainability goals. This article explores market trends, local advantages, and actionable insights for businesses and homeowners seeking. . Sigenergy has deployed a 10 MW/20 MWh battery energy storage system (BESS) at a solar site in Malko Tarnovo, Bulgaria, using 240 kWh battery stacks typically found in residential systems. From ESS News Stationary BESS are typically categorized by size, beginning with stack systems, followed by. . Bulgaria is among the leaders in the European Union in terms of newly installed battery energy storage capacity. 15 billion levs ($675 million) under its EU-funded procurement exercise named RESTORE. 89 MWh, the Ministry of Energy said. .