Axpo and Energix have signed an agreement to optimise Poland’s largest battery energy storage system (BESS), marking another milestone in Axpo’s expanding storage portfolio this year.
Located in Nowe Czarnowo, West Pomerania, the 24MW/56MWh facility is currently undergoing commissioning and prequalification for the balancing market. Once licensed in January 2026, it will become the first utility-scale BESS in Poland, setting a benchmark for the country’s growing energy storage sector and supporting the shift to a more flexible and resilient grid.
Under the agreement, Axpo will manage full revenue optimisation for the project, providing commercial, regulatory and technical support to integrate the facility into the wholesale and balancing markets.
Built near the Krajnik power station, the system complements Energix’s nearby wind and solar farms, which are already part of Axpo’s portfolio. The company said the project enables comprehensive management of local energy assets and optimisation of grid connection costs with PSE, Poland’s transmission system operator.
Axpo and Energix already cooperate through seven renewable power purchase agreements covering 300MW of wind and 40MW of photovoltaic capacity. The BESS partnership includes a profit-sharing model between both companies and addresses obligations such as capacity handling and ancillary market participation.
Mateusz Marczewski, managing director of Axpo in Poland, said: “As one of the first companies in Poland, we have developed comprehensive contractual and commercial solutions for the optimisation of battery energy storage systems. Axpo’s flexible solutions can rapidly bring to market new services that stabilise the grid and increase the profitability of renewable projects.”
Energix Polska chief executive Artur Violante added: “Axpo is a proven and reliable partner for us, combining international know-how with local experience. The Nowe Czarnowo storage facility is just the beginning. The development of energy storage solutions like this is a key pillar of our expansion strategy in Poland and globally.”
Axpo said it continues to expand its international battery storage business, building on experience in Switzerland and across Europe.