EDF commissions Polish grid battery

EDF Power Solutions has commissioned a 50MW/120MWh battery energy storage system at Stary Grodków in southern Poland, marking its first storage project in the country.

The project has a 50MW grid connection and 120MWh of energy capacity. It is supported by a 17-year capacity contract with Poland’s transmission system operator, giving the asset a long-term role in system adequacy and renewable energy integration.

The storage system includes containerised battery modules and associated electrical infrastructure, including a transformer station and connection to the 110kV grid. Sungrow provided technology support for the project, which has been positioned as one of Poland’s most powerful battery systems.

Poland’s electricity system is moving through a complex transition. The country has historically relied heavily on coal-fired generation, while renewable deployment, interconnection, market reform, and EU decarbonisation requirements are changing generation patterns and grid operation. Storage adds a source of fast-response flexibility without the operating profile of thermal generation.

A 120MWh battery will not remove the need for other forms of balancing and reinforcement, but it can support frequency control, reserve, capacity adequacy, and renewable smoothing. Batteries can respond rapidly to system signals, making them useful in a grid with rising shares of variable solar and wind output.

The 17-year capacity contract gives the project a defined system role over a long operating period. Contracted revenue models are increasingly shaping European storage investment, because they can support project finance and create clearer availability obligations. The asset is therefore being integrated into Poland’s security-of-supply framework as well as its energy trading environment.

Poland has also been part of the wider European BESS pipeline moving through development and delivery. The Stary Grodków project stands out because it has reached commissioning, which is the point at which market design, grid studies, equipment supply, civil works, and controls integration are tested in operation.

The country’s flexibility requirement is being shaped by several pressures at once. Renewable output is rising, particularly from solar PV and wind. Coal assets are ageing and increasingly exposed to carbon costs and operational constraints. Industrial electricity demand remains substantial, and grid infrastructure has to adapt to more distributed generation and changing regional power flows.

Battery operation at this scale requires more than energy capacity. The asset must manage degradation, state of charge, thermal conditions, warranty limits, safety systems, and market participation rules. Its value will depend on availability and response performance, not only installed MW and MWh figures.

The 110kV connection places the project at an interface where regional grid conditions and system-level service requirements can meet. That voltage level allows the battery to participate in wider system services while remaining close enough to regional network conditions to provide practical flexibility.

Commissioning also creates operational learning for future projects. Grid-scale BESS assets require coordination between inverters, battery management systems, energy management platforms, transformers, protection equipment, communications systems, and network operator controls. Performance under real grid conditions will influence future specifications, procurement, and connection requirements.

Poland is likely to need additional storage as renewable capacity grows and coal generation declines over time. Pumped hydro, interconnection, demand response, gas generation, and grid reinforcement will all contribute to system flexibility, but batteries are well suited to fast-response and shorter-duration balancing. Stary Grodków gives the market a substantial early reference point for utility-scale battery operation.