Belgium commissions the largest battery energy storage system in continental Europe
Europe’s energy transition enters a new phase.
Experiences of recent years — including sharp energy price fluctuations, the rapid growth of renewable energy in the mix, and grid congestion issues — have shown that wind and solar farms alone are not enough to build a stable electricity system. A key element is large, grid-scale energy storage systems capable of buffering production surpluses and releasing energy during periods of peak demand. An example of such an investment is the newly commissioned Vilvoorde Battery Energy Storage System in Belgium, currently the largest of its kind in continental Europe.
Vilvoorde – from gas power plant to a symbol of new energy
The history of the Vilvoorde site is symbolic. A few years ago, a modern gas-fired power plant was planned there to strengthen Belgium’s system as coal and nuclear units were being phased out. However, due to environmental permitting issues, the project was halted. Instead, ENGIE decided to shift entirely from fossil fuels toward innovative battery infrastructure.
Today, Vilvoorde stands as a flagship example of how former gas-based plans are giving way to clean technologies, signaling that the energy transition is happening in real time across Europe.
Technical specifications of the project
The first phase of the storage system comprises 100 MW of power and 400 MWh of capacity, enough to power up to 96,000 Belgian households for four hours. In 2025, the second phase will be completed, doubling the system’s capacity to 200 MW / 800 MWh.
The system uses 320 PowerTitan modules — advanced, liquid-cooled storage units developed by Sungrow — offering several advantages:
- Higher energy density – about 7% improvement over previous generations
- Better thermal control and lower noise (75 dB vs. 79 dB)
- Faster installation – up to 50% shorter than conventional solutions
- Compact design, enabling efficient use of space
These features allow the system to operate safely and stably under highly variable grid conditions.
Why it matters for Belgium and Europe
Belgium has a unique energy mix: limited hydro potential, high population density, and ambitious plans to phase out nuclear and fossil fuels. The high share of wind and solar increasingly leads to overproduction during windy and sunny days and deficits in the evening.
The Vilvoorde BESS functions as a system buffer, absorbing energy during low-demand periods and supplying it during peak load, providing:
- Reduced transmission grid congestion
- Lower risk of blackouts
- Higher profitability for renewable farms, allowing them to sell energy not only when the sun shines but also later in the day
Collaboration between technology and energy sectors
Vilvoorde’s success is not just about technology but also strategic collaboration between ENGIE and Sungrow. ENGIE handles grid integration, while Sungrow contributes expertise in advanced energy storage design and operation.
Vincent Verbeke, CEO of ENGIE Belgium, emphasized that the project would not have been possible without strong partnerships and trust in innovative technology providers. Moritz Rolf, Vice President of Sungrow Europe, noted that this is just the beginning, and flexible energy storage systems will become a cornerstone of the next phase of Europe’s transition.
Continental Europe’s largest battery?
Although Sungrow promotes Vilvoorde as the largest in continental Europe, this claim is debated. In Bulgaria, a 124 MW / 496 MWh system has been operational since May 2025. However, after the second phase is completed, Vilvoorde will undoubtedly become the largest. It is also worth noting that ENGIE is developing another large battery in Kallo, Belgium.