Greenvolt Power has begun construction of a 600 MW / 2.4 GWh battery energy storage system in Siedlce, Poland, targeting commercial operation by the end of 2027. BYD Energy Storage will supply the battery technology, delivered as 210 battery containers and 105 transformer containers with integrated power conversion systems to interface with the grid. P&Q will carry out the grid connection works to Polskie Sieci Elektroenergetyczne’s transmission network at 400 kV, including a new 400/110 kV substation and both 400 kV and 110 kV cable links. The facility is designed to charge during periods of high renewable generation and discharge when demand rises, providing fast-response flexibility and grid-balancing services.
The Siedlce project expands Greenvolt’s Polish footprint alongside an operational 200 MW / 800 MWh BESS at Turośń Kościelna (online July 2026) and a second 200 MW / 800 MWh plant at Ełk scheduled for Q4 2026. Once all three are operating, Greenvolt will have 1 GW of power capacity and 4 GWh of storage in Poland, strengthening its role in integrating wind and solar and offering both grid-scale and behind-the-meter solutions through its Greenvolt Next arm. The portfolio positions the company as a major provider of system flexibility as Poland scales variable renewable generation.
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