Europe is beginning to build one of its largest battery storage facilities: 2.4 GWh capacity, €300,000,000 in investment, and BYD technology.
03/10/2026 12:30
Updated to
03/10/2026 12:30
Europe adds another large-scale energy storage project. Greenvolt Power has begun construction in Siedlce, Poland, of a BESS system with 600 MW of capacity and 2.4 GWh of storage capacity. The company considers this facility to be among the largest in Europe and will be the biggest of its kind in Poland.
The investment exceeds 300 million euros, according to Greenvolt’s confirmation to Lusa news agency. The project will feature 210 battery containers and 105 transformer containers with power conversion systems, with BYD Energy Storage providing the battery technology.
2.4 GWh to store excess electricity
The facility will be designed to store electricity during periods of high generation, especially from renewable sources, and release it back into the grid when demand increases. In this way, the system can help balance supply and demand and facilitate the integration of more wind and solar energy into Poland’s electricity system. Its 2.4 GWh capacity also gives an idea of the project’s scale. The maximum power will be 600 MW, meaning that at full discharge, the system could maintain this power level for approximately four hours.
Greenvolt has commissioned BYD Energy Storage to supply the battery systems. The design includes the aforementioned 210 storage containers, while another 105 containers will house transformers and conversion equipment necessary to manage electricity exchange with the grid. The electrical infrastructure will be handled by P&Q and ONDE. Additionally, P&Q will connect the system to Poland’s 400 kV transmission grid, including a new 400/110 kV substation and the corresponding high-voltage links.
In addition to storing renewable energy surpluses, this type of facility can provide balance and stability services to the power grid, which becomes increasingly important as the role of technologies dependent on wind or solar power grows. Batteries enable rapid response to fluctuations in generation and demand, reducing the need to rely on conventional power plants to address these imbalances.
The scale of this project also reflects how Europe’s energy storage market is evolving. Until a few years ago, many BESS systems were associated with relatively small installations or pilot projects, but now complexes of several hundred megawatts are being deployed to operate directly with the transmission grid.
In this case, the size of Siedlce will enable Greenvolt to operate a facility capable of transmitting large amounts of energy in short periods, which is particularly useful in an electricity system like Poland’s, where the expansion of renewable energy sources requires enhanced flexibility and storage capacity.
Greenvolt to Achieve 4 GWh of Storage in Poland
The Siedlce project is not isolated, as Greenvolt already commissioned another facility in Turośń Kościelna in July 2026, with 200 MW and 800 MWh capacity, while a second project of identical capacity in Ełk is scheduled to enter commercial operation during the fourth quarter of this year. Once all three systems are operational, Greenvolt will have 1 GW of capacity and 4 GWh of storage capacity in Poland. Alone, Siedlce will account for more than half of this total capacity.
The company expects the new complex to begin commercial operation by the end of 2027. Greenvolt also has a portfolio worth approximately 4.6 GW in BESS projects, of which around 2.4 GW are located in Poland, reflecting the growing importance of storage in its European strategy.
João Manso Neto, CEO of the group, explained that the goal is to strengthen the necessary infrastructure to integrate more renewable energy into the grid, and highlighted Poland as one of Greenvolt’s strategic markets for energy storage development.
