Greenvolt Power opens 200 MW/800 MWh BESS in Poland, one of the country's largest

Greenvolt Power has inaugurated a 200 MW/800 MWh battery storage facility in Turośń Kościelna, Poland, and is finalizing a second project of the same scale, as storage gains ground in the country's capacity market.

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Greenvolt Power has brought online a utility-scale battery energy storage system in Turośń Kościelna, Poland, with a power rating of 200 MW and a storage capacity of 800 MWh, making it one of the largest facilities of its kind in the country. The site, located in the Podlaskie Voivodeship near Białystok, is connected to the national transmission grid at 110 kV. The system can discharge at full power for roughly four hours and respond to grid operator signals within seconds, according to the company. It uses lithium iron phosphate (LFP) cells and is designed for an operating life exceeding 20 years.

The plant consists of 196 containerised battery modules and 49 containerised transformer stations, spread over a footprint of about 35,000 square meters. More than 25,000 square meters—over 70 percent of the area—remains biologically active, and the project underwent an environmental and social assessment aligned with IFC and EBRD standards. P&Q acted as general contractor, while BYD Energy Storage supplied the battery technology.

From 2028, the Turośń Kościelna facility will take part in Poland's capacity market under a 17-year contract, with a capacity obligation of 170 MW, equivalent to 85 percent of its power rating. The inauguration comes amid a broader expansion of storage in Poland's capacity market: in the main auction for the 2028 delivery year, 33 electrochemical storage units won contracts with a combined capacity obligation exceeding 1.7 GW, and storage accounted for 15 percent of all contracted capacity, according to the Polish Energy Regulatory Office.

Greenvolt Power is also finalising a second 200 MW/800 MWh project in Ełk, in the Warmińsko-Mazurskie Voivodeship, with commercial operation planned for the fourth quarter of 2026. Together, the two sites will supply 400 MW of power and 1.6 GWh of storage. The company is additionally developing a larger facility in Siedlce, planned at 600 MW/2.4 GWh, which would become Poland's biggest BESS and one of the largest in Europe.

The Turośń Kościelna opening follows the launch of the Buj BESS in Hungary last month, a 99.8 MW/288.6 MWh installation that is now Hungary's largest operating battery storage system.

João Manso Neto, CEO of Greenvolt Group, said that as power systems become more electrified and renewable-based, flexibility is turning into an essential part of the energy transition, and that Poland is a market where large-scale storage has a particularly important function. He noted that the Turośń Kościelna investment bolsters Greenvolt's standing in one of the sector's fastest-growing areas, calling battery storage a key growth driver with projects in 13 countries and a pipeline of 5 GW.

Weronika Nowak, CEO of Greenvolt Power, said the Turośń Kościelna project is especially meaningful because it shows utility-scale storage becoming a real part of Poland's power system. She described the inauguration as the official presentation of a completed facility tied to the grid at 110 kV, while a second project of identical scale is being finalised in Ełk and the Siedlce development advances, gradually expanding the company's BESS footprint in Poland.

Greenvolt Power's probability-weighted pipeline totals 12.8 GW across onshore wind, solar and battery storage, with batteries comprising 5 GW. In Poland, as of the end of June 2026, the portfolio included 2,595 MW of energy storage, 657 MW of solar PV and 238 MW of wind. The company expects to invest about €800 million in Polish renewable energy assets by the end of 2026.