LEAG and Fluence to develop Europe’s largest single-site battery system at 1 GW/4 GWh in Germany

Energy
November 20, 2025 · 8:28 PM3 min read

LEAG Clean Power GmbH and Fluence Energy GmbH made an announcement regarding the construction of the largest battery-based energy storage system within the continent of Europe, a remarkable groundbreaking initiative of its kind, with the capacity of 1 GW/4 GWh located at the industrial region of Jänschwalde in Germany. The groundbreaking GigaBattery Jänschwalde 1000 system marks Fluence’s largest single facility of its capacity yet across the world, employing its Smartstack technology platform.

Revolutionary GigawattFactory concept transforms German energy

LEAG Clean Power’s innovation in the field of power generation extends with its new ‘Gigawatt Factory’ initiative that offers an unprecedented form of power production that incorporates solar panels and the power of the winds with power plants and even power storage systems. This innovation of power production is being implemented at various power-generating points across the region of the Lusatia Energy Area.

This approach of the company corresponds with one of the biggest hurdles on the path of the transition of the energy system and the availability of power at all times, despite the intermittent character of the different forms of renewable power on the grid. This company aids the transition of the German power system by setting up the so-called gigascale power storage facilities.

Key components of the GigawattFactory approach include:

  1. Integration of solar photovoltaic and wind energy generation systems
  2. Deployment of flexible power plants for grid stability and backup power
  3. Large-scale battery storage facilities for energy management and distribution
  4. Strategic positioning at multiple locations across Germany’s energy regions

Smartstack technology enables unprecedented storage capacity

The system that the company calls the GigaBattery Jänschwalde 1000 shall employ Fluence’s Smartstack technology. This shall make the system cutting-edge technology in the field of battery-based energy storage systems. This four-hour battery system shall take the form of grid stabilization infrastructure and enable the optimal use of grid connectivity.

Fluence Energy has made its presence clear as the world’s leading player in the business of offering intelligent energy-storing and optimizing software solutions on renewable forms of power, with gigawatts of projects implemented across almost 50 different countries around the world. Fluence’s expertise on the latest battery technology designs and their highly dedicated German software and execution team make them an ideal choice for this historic initiative.

German government support reinforces energy storage

The German government emphasized that the topic of energy storage is of great significance with regard to the achievement of an affordable and secure power system. This flagship project will contribute significantly toward the delivery of essential services on the grid and thus the enhancement of the energy security of the continent.

Strategic partnership addresses Europe’s energy transition challenges

The collaboration of LEAG and Fluence marks the beginning of the combination of expertise that requires visionary thinking and the bravery that carry out a significant transformation of the world’s energy system. As Julian Nebreda stated, this flagship initiative displays the power of partnerships that can not only revolutionize the world of energy but also the bedrock of the world’s economies as well.

The relevance of this development extends well beyond its very technical numbers, being so impressive and groundbreaking. As Germany further pursues the various strategies of diversifying its power mix by resolving the issue of nuclear power and coal power with the incorporation of increased power storage and the production of hydrogen gas, this development sets the tone for what will come next.

This cutting-edge collaboration of LEAG and Fluence on the development of the largest single-site battery system on the continent marks a turning point on the road toward the transition of European countries toward the new age of clean energy. The 1 GW/4 GWh GigaBattery Jänschwalde 1000 system stands as the first step on the road toward meeting the central issue of integrating intermittent renewable power into the grid.