Sungrow, in partnership with Sunotec, has commissioned a 150 MW/600 MWh battery energy storage system (BESS) in Nova Zagora, Bulgaria. Developed and owned by Enery, the project utilizes Sungrow’s PowerTitan 2.0 liquid-cooled energy storage technology and is financed through the Bulgarian Ministry of Energy’s RESTORE program.
The project is among the largest battery storage installations in Bulgaria and is expected to enhance grid flexibility, support renewable energy integration, and strengthen the resilience of the country’s power system. The facility also represents the first major milestone under a broader energy storage collaboration between Sungrow and Sunotec, announced at Intersolar 2025, which targets up to 800 MWh of battery storage capacity in the Nova Zagora region, with a potential expansion of up to 1 GWh.
According to Sungrow, the Nova Zagora BESS marks a significant step in Southeast Europe’s energy transition. Sunotec stated that the project will contribute to improving grid resilience and supporting the deployment of renewable energy infrastructure in Bulgaria. Enery noted that the battery storage system will provide flexibility services through participation in power and balancing markets while facilitating the efficient integration of renewable energy.
The Nova Zagora facility forms part of a larger portfolio of storage projects being jointly implemented by Sungrow and Sunotec across Bulgaria. The partners plan to bring a total of 2.2 GWh of battery storage capacity online within the next two months, with overall capacity expected to reach 3 GWh by the end of 2026. Upcoming developments include the Knizhnovik Phase 1 hybrid BESS and solar PV project, which will feature a capacity of 100 MW/200 MWh.
Powered by Sungrow’s PowerTitan 2.0 system, the project incorporates advanced liquid-cooling technology designed to optimize land use, improve operational efficiency, and enhance safety. Through support from the Bulgarian RESTORE program, the project is expected to contribute to Bulgaria’s energy security goals and accelerate the integration of renewable energy into the national grid.
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