A 602 MWh battery storage facility has been connected to Bulgaria’s electricity grid in the coastal city of Burgas, marking one of the most significant energy storage additions in the country in recent years.
The project was developed by Bulgarian renewable energy company Solarpro Technology in cooperation with Chinese battery manufacturer CATL, combining local engineering expertise with advanced battery technology solutions.
According to the companies, the installation increases Bulgaria’s total energy storage capacity by around 10%, highlighting the rapid scaling of flexibility assets in the national power system.
Solarpro Technology acted as the engineering, procurement and construction (EPC) contractor, responsible for the design, installation and full integration of the system into the grid infrastructure.
The facility is based on CATL’s TENER battery storage technology, which is designed for large-scale grid applications and high operational flexibility.
The battery system will primarily provide balancing services, helping the transmission system operator manage fluctuations in electricity supply and demand, particularly during periods of high renewable generation.
By absorbing excess electricity and releasing it during peak demand, the system is expected to improve grid stability and reduce volatility in the Bulgarian power market.
The project is considered one of the largest battery storage installations in Eastern Europe and represents a major step forward in the region’s transition toward flexible, renewable-based energy systems.
Following its completion, Solarpro Technology and CATL confirmed plans to continue their cooperation on additional battery storage projects in Bulgaria and across wider Southeast European markets, signalling further expansion of grid-scale storage capacity in the region.