Sunday, 6 September 2026
Futureal Group and Mithra Energy have sold a major battery energy storage project in central Poland to ENGIE, marking another large transaction in the country’s rapidly developing electricity storage market.
The Trębaczew project, located in the Działoszyn municipality in Łódź Voivodeship, is planned with a power capacity of 438 MW and storage capacity of approximately 876 MWh. The facility will connect directly to the Trębaczew electricity substation, placing it among the larger battery storage developments currently progressing through Poland’s investment pipeline.
Under the transaction, ENGIE has acquired the project company responsible for the development from the partnership involving Futureal Investment Partners and Mithra Energy. The international utility will take responsibility for advancing the scheme through its remaining engineering, development and construction stages.
ENGIE expects the project to reach ready-to-build status during the fourth quarter of 2026, with commissioning currently targeted for the first quarter of 2029. This timetable indicates that the scheme remains in the development phase rather than being a battery facility already under physical construction.
The acquisition strengthens ENGIE’s position in Poland’s emerging utility-scale storage sector. Earlier in 2026, the group completed an agreement with R.Power covering the 250 MW / 1,000 MWh Tursko Wielkie battery project. Together with Trębaczew, the two investments give ENGIE a substantial pipeline of large-scale storage capacity in Poland.
For Futureal and Mithra Energy, the sale demonstrates an exit route for infrastructure projects that the partners have originated and moved through the development process before transferring them to a long-term energy-sector investor.
“We are proud to continue partnering with major European utilities and supporting their green energy transition. We would like to thank ENGIE for its professionalism throughout the transaction process, as well as our advisers EY, DLA Piper and SKS for their support. Congratulations also go to the Mithra and Futureal Investment Partners development and deal teams, whose dedication and attention to detail have been instrumental in bringing projects of this scale to fruition,” said Christopher Guzowski, CEO and Founder of Mithra Energy.
The transaction is particularly notable for Futureal because it extends the group’s investment activities beyond its established real estate operations and further into energy infrastructure. Together with Mithra Energy, it has assembled a Polish battery storage development portfolio approaching 3 GW, with the projects intended to progress towards development and construction by the end of the decade.
“The Trębaczew transaction is a significant step in the continued expansion of our investment activities in Poland. Large-scale battery storage will play an increasingly important role in supporting the integration of renewable energy and enhancing the flexibility of the Polish power system. Together with Mithra Energy, we have built a substantial development pipeline, and this transaction demonstrates our ability not only to originate and advance complex projects, but also to attract leading international energy companies as long-term partners. Poland remains a strategic market for us, and renewable energy remains an integral part of this endeavor,” said Karol Pilniewicz, CEO of Futureal Investment Partners, a member of Futureal Group.
The partners have indicated that approximately 1.5 GW of their storage portfolio could be connected to the Polish grid by the end of 2027. This remains a developer target and will depend on individual project development, construction and grid-connection schedules.
Battery storage is becoming increasingly important to Poland as the share of variable renewable electricity expands. Large installations can store electricity when generation exceeds immediate demand and release it when required, while also providing services that can help balance the power system.
The investment case is consequently closely connected to Poland’s wider electricity infrastructure. Grid connection capacity has become an increasingly important constraint for renewable generation and energy-intensive property development, while large battery facilities can provide additional flexibility as wind and solar capacity increases.
Futureal and Mithra are also expanding into renewable generation. The partners are developing a 45 MW wind farm in northern Poland, which they expect to complete by the end of 2026. The development forms part of a strategy combining renewable generation with large-scale electricity storage.
For the commercial property and infrastructure markets, the Trębaczew transaction illustrates a broader convergence between real estate capital and energy investment. Grid access, electricity availability and energy infrastructure are becoming increasingly significant considerations for logistics parks, industrial developments and data centres, while institutional investors and property groups are beginning to participate more directly in the infrastructure supporting that demand.
The sale to ENGIE provides Futureal and Mithra with evidence that large Polish storage projects can attract established international utility investors once they have advanced sufficiently through the development process. With almost 3 GW in their wider pipeline, Trębaczew could therefore represent the first of several opportunities for the partners to recycle development capital while Poland builds the storage capacity required for a more renewable-intensive electricity system.
