Switzerland is developing one of the world’s largest energy storage facilities beneath the town of Laufenburg, where a deep excavation—reportedly the size of two soccer fields—is being transformed into a massive underground battery system designed to stabilize Europe’s electricity grid.
The project, led by FlexBase, is expected to deliver up to 2.1 gigawatt-hours (GWh) of storage capacity and a power output exceeding 1.2 gigawatts (GW), placing it among the most powerful grid-scale battery systems ever planned.
A Huge Underground Energy Hub.
Construction began in 2025 at the Technology Center Laufenburg in the Swiss canton of Aargau, a key location in Europe’s interconnected power network.
The facility is being built roughly 89 feet underground and will combine:
A large redox flow battery system
An AI-powered data center
Office and research spaces
A district heating integration system
Above ground, the wider complex spans more than 430,000 square feet, while the battery infrastructure itself occupies an extensive underground footprint.
Why the Project Is Going Underground.
Unlike compact lithium-ion batteries, redox flow batteries require large tanks, pumps, and processing systems. Their size makes underground construction practical for scaling up energy storage while preserving surface space.
Flow batteries store energy in liquid electrolytes, which are circulated through electrochemical cells during charging and discharging. Increasing storage capacity typically involves expanding tank volume, making them well-suited for large infrastructure projects.
Designed to Stabilize Renewable Energy:
The system is intended to support Europe’s growing renewable energy supply by storing excess electricity from solar and wind power and releasing it when demand spikes.
Operators say the facility could act as a “shock absorber” for the grid, helping balance frequency and voltage fluctuations caused by variable renewable energy production.
Swiss grid operator Swissgrid has already approved an initial 800 MW connection phase, with expansion expected in later stages.
Partnership and Technology:
Energy technology company Invinity Energy Systems has been selected as a strategic partner for the project. The system is expected to use vanadium-based flow battery technology, known for its long cycle life and lower fire risk compared to lithium-ion systems.
Developers highlight safety advantages, particularly the non-flammable nature of the liquid electrolyte used in the system.
Beyond Energy Storage.
The project also integrates artificial intelligence infrastructure, with plans for a data center that will reuse waste heat for district heating in nearby communities.
Developers estimate that heat recovery alone could significantly reduce carbon emissions over time.
The overall investment for the project is estimated between CHF 1 billion and CHF 5 billion, and it is expected to create around 300 jobs.
Timeline.
Full commissioning of the facility is projected for 2028–2029, with phased expansion depending on grid integration progress.
A Step Toward Europe’s Energy Transition
The Laufenburg project reflects a broader shift in Europe’s energy strategy—not only expanding renewable generation but also building large-scale storage systems capable of making wind and solar power reliable around the clock.
When completed, the underground facility is expected to become one of the most powerful grid batteries in the world, marking a major milestone in energy infrastructure development.
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