Greenvolt Power, part of the Greenvolt Group, has agreed a new supply deal with BYD Energy Storage for battery systems for the Siedlce Battery Energy Storage System in Poland.
With a planned capacity of 600 MW / 2.4 GWh, it is set to become Poland’s largest battery storage facility and one of Europe’s biggest.
The agreement moves the project closer to construction, with BYD providing its BYD Haohan system. Revenues are already secured through Poland’s capacity market, construction is expected in Q3 2026, and commercial operation is planned for late 2027. Once online, the site will support grid stability and enable further renewable expansion across Poland and Europe.
”Energy storage is a critical enabler of more resilient and flexible energy systems, while supporting the continued growth of renewable energy. Greenvolt has built a significant BESS pipeline and is developing some of the largest battery storage projects in Europe, further strengthening its position as a leading player in this growing segment João Manso Neto CEO of Greenvolt Group
”The Siedlce project marks another important milestone in our cooperation with Greenvolt Power and highlights the growing role of battery storage in Europe’s energy transition. Being selected for a project of this scale reflects the confidence placed in BYD Energy Storage’s technology and expertise Yin Xueqin General Manager of BYD Energy Storage
”The Siedlce project reflects both the scale of our ambitions in Poland and the capabilities we have built in energy storage. As one of the largest BESS projects in Europe, it represents another important step in executing our strategy and delivering projects that truly support the energy transition Weronika Nowak CEO of Greenvolt Power
The partnership builds on earlier agreements signed in March 2025 for the Turośń Kościelna and Nowa Wieś Ełcka BESS projects, totalling 1.6 GWh of storage. Poland remains a core market for the Greenvolt Group, with a pipeline including 238 MW wind, 657 MW solar, and 2,595 MW battery storage, contributing to a global portfolio of 12.8 GW and supporting its asset rotation strategy, which reached 1 GW in sales in 2025.
