LEAG and Fluence to build Europe’s largest battery storage system in Germany

LEAG Clean Power GmbH and Fluence Energy GmbH will develop Europe’s largest battery energy storage facility in Jänschwalde, Germany, marking a major step in the country’s transition toward large-scale renewable energy systems. The GigaBattery Jänschwalde 1000 project will deploy a 1 GW / 4 GWh Smartstack energy storage system to help stabilize the grid and support Germany’s long-term clean energy ambitions.

Announced on November 7, the project highlights the growing momentum behind energy storage technologies in Europe as nations seek flexible solutions to integrate wind and solar power. The partnership also strengthens LEAG’s ongoing GigawattFactory program, which combines renewable generation with flexible power and storage technologies across the Lusatia region.

Project aims to boost grid stability and energy reliability

LEAG leadership emphasized the importance of large-scale storage in ensuring consistent renewable power delivery. CEO Adi Roesch said the project represents “another growth engine” for their energy transformation strategy, noting that gigascale storage will address availability challenges tied to intermittent renewable energy.

Fluence President and CEO Julian Nebreda called the collaboration a transformative moment for Europe’s energy landscape, stating that combining expertise and forward planning can “transform the energy system and the foundation of our economy.”

The system will offer essential grid services, strengthen energy trading capacity, and reinforce national energy security, aligning with Germany’s renewed commitment this year to expand energy storage in support of its decarbonization goals.

German energy strategy drives battery investment

LEAG and Fluence executives underscored that the four-hour design capacity will maximize the existing grid infrastructure and support stable energy supply during periods of fluctuating renewable output. LEAG Managing Director Thomas Brandenburg described the project scale as “something special,” highlighting the technical benefits in grid stability.

Fluence Managing Director Markus Meyer added that the company’s deep roots in Germany and proven storage technology position it strongly to deliver the GigaBattery Jänschwalde 1000 system alongside LEAG.

With the project, Germany moves closer to establishing a flexible, secure, and renewable-powered energy network capable of meeting rising power demands across the region.