MUNICH and SOFIA, Bulgaria, June 12, 2026 /PRNewswire/ -- Sungrow, a world-leading provider of PV inverters and energy storage systems (ESS), together with Sunotec - one of Europe's largest EPC companies - has successfully commissioned its first large-scale battery storage project. The facility in Nova Zagora, Bulgaria, has a capacity of 150 MW / 600 MWh. It uses Sungrow's liquid-cooled ESS technology PowerTitan 2.0. Led and developed by Enery, a leading independent power producer in Central and Eastern Europe, the project is financed through the national RESTOR program of the Bulgarian Ministry of Energy.
The facility is one of the largest battery storage projects in the country and marks an important milestone for the energy transition in Southeast Europe. It takes a significant step towards strengthening grid resilience and integrating renewable energy into Bulgaria's power supply. The planned storage capacity of up to 800 MWh, with a view to expanding to 1 GWh in the Nova Zagora region, is among the largest large-scale BESS projects installed in Bulgaria to date.
"The project reflects the pace at which energy storage is becoming an integral part of systems in Southeast Europe. With PowerTitan 2.0, we deliver a solution that supports grid stability while enabling the next phase of clean energy expansion," emphasizes Anastasios Gkinis, Vice President at Sungrow Europe, responsible for the Bulgarian market.
Sunotec's founder and CEO, Kaloyan Velichkov, adds: "Together with Sungrow, we are advancing one of Bulgaria's most significant storage projects and making a substantial contribution to future-proofing energy systems. We combine this infrastructure with long-term systems to sustainably strengthen Bulgaria's power grids. It is precisely this integrated approach that creates real added value."
Petya Dimova, Head of Enery Portfolio Optimization: "The successful commercial start of the BESS project in Nova Zagora is the starting line of the value chain for this installation. Through advanced optimization processes and active participation in energy markets, these storage systems will provide the critically needed flexibility and support the integration of renewable energy in Bulgaria."
Ambitious Expansion Program in Bulgaria
The Nova Zagora project is part of a large portfolio of energy storage projects that Sungrow and Sunotec are jointly implementing in Bulgaria. In the next two months, a total of 2.2 GWh of battery storage capacity will be commissioned. By the end of 2026, total capacity is expected to grow to 3 GWh.
Pipeline projects include Knizhnovik Phase 1, a hybrid BESS and PV project with a capacity of 100 MW/200 MWh, developed together with Enery. The Nova Zagora project is the first large-scale standalone battery storage project in Bulgaria to fully comply with Bulgarian grid regulations.
With the gradual commissioning of a total of 3 GWh of battery storage capacity by the end of 2026, both partners are making a significant contribution to the integration of renewable energy and grid stability in the region.
PowerTitan 2.0: State-of-the-Art Technology for Grid Stability
The Nova Zagora project uses Sungrow's liquid-cooled energy storage solution PowerTitan 2.0. The system's compact design optimizes land use and enables fast installation, while intelligent cooling technology ensures a temperature-controlled, cost-efficient, and safe system. PowerTitan 2.0 is already successfully deployed in numerous European countries and has proven itself under various grid and market conditions. Through financing via the Bulgarian RESTOR program, the project contributes to strengthening energy security and integrating renewable energy into the Bulgarian power grid.
About Sungrow Sungrow Power Supply Co., Ltd. ("Sungrow") is a world-leading provider of renewable energy technologies and has been pioneering sustainable energy solutions for over 29 years. As of December 2025, Sungrow has installed 1,000 GW of power electronic inverters worldwide. The company is considered the most bankable energy storage company (BloombergNEF). Sungrow's innovations enable green energy projects globally, supported by a network of 520 service points for the best customer service. Sungrow aims to build a bridge to a sustainable future through cutting-edge technology and high-quality services. More information at: https://www.sungrowpower.com
About SUNOTEC SUNOTEC is an international system integrator for large-scale renewable energy infrastructure, specializing in the planning and implementation of integrated energy systems. The company combines energy generation, storage, grid infrastructure, and lifecycle expertise to create reliable and future-proof energy solutions. Founded in 2012, SUNOTEC has realized more than 680 photovoltaic plants with an installed capacity of over 15 gigawatts and battery energy storage projects with a capacity of 6 GWh in Europe and beyond. With headquarters in Sofia, Bulgaria, and Munich, Germany, the company combines international expertise with local execution. SUNOTEC employs over 2,000 professionals worldwide and continues to expand into new markets through strategic partnerships and joint ventures. More information at: https://www.sunotec-group.com
About Enery Enery is an independent power producer committed to providing reliable, affordable, and long-term green energy solutions to its customers. The company operates a diversified portfolio with 2 GW under construction and in operation, generating 766 GWh of clean electricity annually - enough to power more than 1,002,121 households while avoiding approximately 625,069 tons of CO2 emissions each year. With a project pipeline of nearly 10 GW across 10 countries in Central and Eastern Europe, Enery plays a key role in promoting the energy transition in the region. In addition to developing, building, and operating renewable energy projects, Enery also leads in optimizing revenue streams for utility-scale power generation and storage assets, managing more than 2.5 GWh of third-party battery storage capacity. Enery supplies industrial customers with green energy around the clock and is one of the leading providers of corporate green PPAs in the region.
