Bulgarian renewable energy developer Sunotec has connected a 150 MW/379 MWh battery energy storage system (BESS) in Brusartsi, adding another large-scale project to the country’s rapidly growing energy storage fleet.
The facility is Sunotec’s second major battery project to enter operation in Bulgaria within a few weeks. In July, the company commissioned a 50 MW/126 MWh BESS in Byala Slatina. Combined, the two installations provide 200 MW of power capacity and 505 MWh of storage capacity.
Both battery systems will be operated in partnership with Slovenian energy trader GEN-I, which will manage electricity trading and optimize the operation of the facilities.
Sunotec is also expanding its project pipeline in Bulgaria. The company currently has nine additional BESS projects with a combined capacity of 195 MW/782 MWh under development across the country. Commercial operation of these projects is expected within the next 12 months.
The expansion is taking place amid a broader surge in battery storage investment in Bulgaria, supported partly by funding from the country’s National Recovery and Resilience Plan. By early June, Bulgaria had around 4,011 MW/12,240 MWh of installed battery storage capacity, including 3,471 MW/10,768 MWh already connected to the grid.
Bulgaria’s total battery storage capacity is expected to exceed 6 GW/18 GWh by the end of 2026, reinforcing the country’s position as one of Southeast Europe’s fastest-growing energy storage markets.
