BRUSSELS – By 2025, Bulgaria is projected to be the third-largest in the European Union for newly installed battery energy storage capacity, holding a 9 percent market share, following Germany and Italy, as per the annual report from the European solar association (SolarPower. BRUSSELS – By 2025, Bulgaria is projected to be the third-largest in the European Union for newly installed battery energy storage capacity, holding a 9 percent market share, following Germany and Italy, as per the annual report from the European solar association (SolarPower. BRUSSELS – By 2025, Bulgaria is projected to be the third-largest in the European Union for newly installed battery energy storage capacity, holding a 9 percent market share, following Germany and Italy, as per the annual report from the European solar association (SolarPower Europe), according to. According to the report, in just one year, our country has recorded over 1100% growth, ranking it among the fastest-growing markets in Europe. Thus, from about 200 MWh of installed capacity in 2024, by the end of last year it reached nearly 2500 MWh. 1 GWh of new capacity installed, the European Union achieved its 12th consecutive record-breaking year of growth, confirming battery storage as the fastest-scaling clean energy technology in the region. The newly updated Bulgaria BESS Market Outlook. The Bulgarian solar power market has been experiencing significant growth since 2021.