LEAG and Fluence Energy (NASDAQ: FLNC) have announced plans to build Europe’s largest battery energy storage system (BESS) at the site of the former Boxberg coal power plant in eastern Germany. The project will have a total capacity of 4 GWh and marks a major step toward transforming the region’s energy infrastructure from coal to renewables.
Key takeaways
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Massive scale: The project will deploy 2 GW / 4 GWh of battery capacity, enough to stabilize the grid and store excess renewable power for later use.
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Phased development: Construction is expected to begin in 2026, with phased commissioning leading up to full operation by 2028.
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Strategic purpose: The system will support Germany’s energy transition by integrating wind and solar generation, replacing fossil baseload power with flexible storage.
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Partners’ roles: Fluence will provide its Gridstack Pro technology and digital optimization software, while LEAG leads site development and grid connection.
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Energy park transformation: The battery installation is part of LEAG’s larger “Green Power Plant” initiative — a plan to convert its lignite-based power assets into renewable and storage hubs across the Lusatia region.
Street view
Analysts view this as a flagship moment for European grid transformation and a commercial validation for Fluence’s large-scale BESS solutions. The project underlines both firms’ leadership in grid modernization and positions Germany as a global benchmark for utility-scale energy storage.
Catalysts / what’s next
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Final investment decision (FID): Expected in 2026 following permitting and grid studies.
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European energy policy tailwinds: EU funding and Germany’s push for storage infrastructure could accelerate rollout.
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Technology milestones: Fluence’s AI-driven platform will be tested at an unprecedented scale, potentially setting new efficiency and stability benchmarks.
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Future expansion: LEAG plans to add up to 7 GWh of additional capacity across its brownfield sites by 2030.
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