The way we generate and store energy is evolving faster than ever. With more wind and solar power feeding into the electricity grid, balancing supply and demand has become more critical. At the same time, the industry is shifting from mid-scale to large-scale energy storage projects, demanding solutions that maximise capacity, streamline deployment, and enhance grid flexibility. 

At Alfen, we’ve taken this challenge head-on with our newest containerised battery storage system, built for large-scale applications. By integrating larger battery cells and an optimised container layout, it packs up to 6MWh into a single 20 ft container. With back-to-back and side-by-side installation, it provides maximum energy storage with the smallest possible footprint. 

Why does it matter? 

Energy storage plays a key role in supporting the transition to renewables, and solutions must be more efficient, scalable, and adaptable to evolving grid needs. This new setup is built to meet these demands. 

• Higher energy density: A reengineered battery container design increases storage capacity while keeping the footprint compact. The container integrates modular battery racks, a liquid cooling system, a battery management system, and a fire safety panel—ensuring efficiency, reliability, and safety at scale.
• More efficient deployment: Factory-built units streamline logistics and shorten installation times, reducing on-site work.
• Designed for reliability: Incorporates the latest battery technology and meets top industry safety standards for long-term performance.
• Optimised for grid and market flexibility: Fully compatible with grid balancing and energy trading applications, ensuring seamless integration into large-scale energy systems.

How this technology is already making an impact 

This next-generation storage system is already making an impact. Our energy storage project with FlevoBESS, that will generate 126MWh of capacity, is one of the first large-scale 4-hour battery storage projects to leverage this technology, providing critical grid balancing and supporting the growing share of renewables.  

Want to learn more about our project with FlevoBESS?

Located near Dronten, in Flevoland, a central part of the Netherlands, the system will support the region’s ambitious energy transition goals by stabilising the grid, enabling renewable integration, and preparing for future expansions to 204MWh by 2028.
Read the full story here

Looking ahead 

As the energy landscape evolves, storage solutions must evolve with it. Larger, smarter, and more flexible systems like this will play a crucial role in enabling a stable, sustainable energy future.