Sungrow and Sunotec have switched on a 150 MW/600 MWh battery energy storage system in Nova Zagora, Bulgaria, the largest stand-alone battery installation in the country and the first major step in a 3 GWh build-out planned through the end of 2026.
PowerTitan 2.0 anchors a Southeast Europe milestone
The Nova Zagora project is owned by Austrian independent power producer Enery and uses Sungrow's liquid-cooled PowerTitan 2.0 platform, with Bulgarian integrator Sunotec providing engineering, procurement, and construction. The site is financed under the Bulgarian Ministry of Energy's national RESTORE programme, which is bankrolling grid-flexibility assets to absorb the country's growing renewables fleet.
Anastasios Gkinis, Sungrow Europe Vice President for SEE/CEE/CIS, said the project "reflects the pace at which storage is becoming integral to energy systems in Southeast Europe." Enery's Petya Dimova added that the asset will participate in both power and balancing markets to support renewable integration.
One of Europe's fastest BESS build-outs
Nova Zagora is the first project under a partnership Sungrow and Sunotec announced at Intersolar 2025, which envisages up to 800 MWh of storage in the Nova Zagora region alone and a potential expansion to 1 GWh. Over the next two months, a further 2.2 GWh of capacity is scheduled to come online, with 3 GWh planned by year-end.
Pipeline projects include Knizhnovik Phase 1, a hybrid 100 MW/200 MWh BESS-plus-PV asset developed by Enery. The wave of Eastern European storage announcements echoes the pace already set in Western markets — see Eku Energy's 1,000 MWh Griffith filing in Australia and Greenvolt's 288 MWh Buj BESS in Hungary.
RESTORE programme reshapes Bulgaria's grid
Nova Zagora is among the first utility-scale stand-alone storage installations in Bulgaria to fully comply with national grid regulations. The RESTORE programme is funnelling EU recovery funds into projects designed to stabilise frequencies as Bulgaria phases out aging fossil capacity. Sunotec founder and CEO Kaloyan Velichkov said the partners are "future-proofing Bulgaria's energy grid" alongside a global wave of next-generation storage chemistry.
Reporting based on coverage from Energy Global and SolarQuarter.