ENGIE Zielona Energia, a subsidiary of the French utility company ENGIE that operates as a provider and producer of renewable energy in Poland, has acquired a special purpose vehicle developing a 438 MW/876 MWh battery energy storage project.

The project, located in Trębaczew in Działoszyn municipality, was initially developed by Mithra Energy and Futureal Investment Partners, a member of Futureal Group. It is expected to reach ready-to-build status in the fourth quarter of 2026, with commissioning planned for the first quarter of 2029.

The energy storage facility will connect directly to the Trębaczew electrical substation. According to the company, the project is expected to facilitate power evacuation, reduce pressure on local transmission infrastructure, and improve the reliability of electricity supply in the region.

The acquisition follows ENGIE’s investment in a 250 MW/1,000 MWh battery storage project in Tursk Wielki in Poland’s Świętokrzyskie Voivodeship. ENGIE acquired the project from R.Power in June of this year. The Tursk Wielki project had reached ready-to-build status, with construction expected to begin in early 2027 and commissioning scheduled for the fourth quarter of 2028.

In April, ENGIE acquired two battery energy storage projects in Spain with a combined capacity of 278 MW/1.1 GWh. The acquired projects are located in Andalusia, including a 78 MW/312 MWh project in Álora and a 200 MW/800 MWh project in Tarifa, Spain.

During July and August of this year, the company expanded its European energy storage portfolio through acquisitions, construction starts, and project commissioning in Poland, Belgium, Spain, Romania, Portugal, the Netherlands, and the U.K. According to ENGIE, these projects have a combined capacity of 1.1 GW/3.3 GWh. According to the release, ENGIE has 10.7 GW of energy storage capacity operating or under construction globally.

According to Mercom’s recently released 1H 2026 Funding and M&A for Energy Storage report, project acquisition activity accelerated sharply during the first half of 2026, with approximately 14 GW of battery storage capacity changing hands in 63 transactions, compared with 6.1 GW in 31 transactions during the same period in 2025.