IN Brief:
- OX2 has reached final investment decision on a 165MWp solar farm and a 50MW/120MWh BESS in Poland.
- The Lion solar farm is expected to generate around 184GWh of electricity annually.
- The Osiek Jasielski battery project has secured a 17-year Polish capacity market agreement.
OX2 has reached final investment decision on two renewable energy projects in Poland: the 165MWp Lion solar farm and a 50MW/120MWh battery energy storage system at Osiek Jasielski.
The solar project is located in the Slawa municipality in Lubuskie Voivodeship and is expected to generate around 184GWh of electricity each year. The project was successful in Poland’s December 2024 renewables capacity auction and has secured long-term project financing from NORD/LB and CaixaBank.
The battery project will be built in Osiek Jasielski in Podkarpackie Voivodeship. It is OX2’s first energy storage project in Poland and has secured support through the main 2027 capacity market auction under a 17-year agreement. Once operational, the system will support renewable integration, grid stability, and dispatchable flexibility within the Polish electricity system.
Poland’s renewable energy market is moving through a phase in which solar deployment, grid connection management, and storage investment are advancing together. The power system remains heavily shaped by conventional generation, but new renewable capacity is increasing the requirement for assets that can support balancing and capacity adequacy. Solar generation and standalone storage answer different parts of that transition: one adds low-carbon generation, while the other adds controllability.
The financing package strengthens the commercial foundation for both projects. Utility-scale renewables now rely on a mix of merchant exposure, contracted revenues, auction support, and grid-service income. Battery projects carry a more complex revenue profile because value can be spread across capacity payments, arbitrage, balancing, ancillary services, and congestion-related opportunities.
A 17-year capacity market agreement gives the Osiek Jasielski project a long-term contracted revenue component. That reduces dependence on short-term trading alone and gives the asset a clearer role within national capacity planning. For battery storage, bankability increasingly depends on exactly that kind of revenue structure, alongside credible optimisation, warranties, degradation modelling, and grid compliance.
Poland is becoming a more active storage market as developers seek to pair growing renewable penetration with flexible capacity. R.Power and Axpo’s Polish BESS optimisation agreement shows how revenue certainty, route-to-market capability, and operational optimisation are now being built into storage projects from the outset. The market is moving beyond installed capacity announcements and toward the harder question of how batteries will earn, dispatch, and maintain value over time.
The Lion project also reflects the scale now being targeted in Polish solar. At 165MWp, it is a strategic generation asset rather than a small ground-mounted scheme. Projects of that size carry heavier engineering requirements around grid connection, electrical design, protection systems, forecasting, construction sequencing, and operational performance.
A large solar farm also has to be designed around system interaction, not only peak generation. Output forecasting, export control, curtailment exposure, and grid-code compliance shape the long-term performance of the asset. As solar penetration rises, the value of the electricity generated depends increasingly on how well projects can operate within a constrained and changing power system.
The Osiek Jasielski battery introduces a different set of operating parameters. A 50MW/120MWh system gives just over two hours of storage duration, supporting short-to-medium duration balancing, capacity obligations, and intraday price management. Its long-term value will depend on dispatch strategy, cycling patterns, degradation control, and the continued development of Polish storage market rules.
Taken together, the two projects show how renewables development is becoming more system-led. Developers are no longer adding generation in isolation and leaving flexibility entirely to network operators. Batteries, hybridisation, forecasting, and optimisation agreements are becoming part of the commercial and technical structure required to make renewable capacity more useful to the grid.
