Switzerland digs giant underground vanadium battery as grids look past lithium-ion
Instead of leaning on the battery style that usually gets the spotlight, Switzerland is backing a much larger, more utilitarian way to store clean energy.
At Laufenburg, a huge underground vanadium flow battery is being built to store renewable power for several hours, smooth electricity supply after sunset, and cut dependence on more expensive backup generation.
Here's what to know
According to a video by Just Have a Think (@JustHaveaThink), the FlexBase Technology Center near the Swiss-German border is planned around a vanadium redox flow battery with an initial capacity of 1.5 gigawatt-hours and the option to grow beyond 2 GWh.
Invinity Energy Systems, the project's technology partner, says the facility is intended to serve grid-balancing needs alongside energy-intensive data center operations.
Flow batteries differ from lithium-ion systems because they keep stored energy in liquid electrolytes contained in separate tanks. That setup allows developers to increase storage duration by enlarging the tanks rather than overhauling the whole battery, which may make the technology especially useful for long backup periods.
The battery planned for Switzerland uses vanadium, which can support repeated charging and discharging with comparatively limited degradation. Its water-based electrolyte also brings a far lower fire risk than many lithium-ion systems, an important benefit for large stationary projects near critical infrastructure.
"This is the kind of real-world performance that conservative energy system operators need to see before they can be convinced to take a chance on something that's not lithium," one commenter wrote.
More background
Lithium-ion still leads the battery storage market. It is compact, well established, and highly responsive, which makes it well suited to the 1-4-hour storage periods many grids already use to manage daily demand changes.
Grids with heavy solar and wind penetration, though, need more than rapid response. They also need batteries that can handle daily cycling for decades, which helps utilities avoid turning on costly gas peaker plants when evening demand climbs.
That shift could translate into more stable electricity prices; fewer pollution-heavy backup options; and better resilience during periods of extreme heat, storms, or other grid stress.
For cities and businesses, longer-duration storage can also mean a lower risk of disruptions and less wasted renewable power.
As the video showed, lithium-ion and flow batteries make more sense as different tools for different tasks than as direct competitors, especially as clean energy deployment speeds up.
What's being done?
Switzerland is not the only place testing that idea.
China already has large vanadium flow storage projects in operation, Japan has been developing the technology for decades, and the United Kingdom's Energy Superhub Oxford combines lithium-ion storage with a smaller vanadium flow system to illustrate how the two can work together.
Vanadium is not the only chemistry under development, either. ESS, for example, is working on a flow battery that uses iron, salt, and water, highlighting how long-duration storage is expanding beyond a single company or approach.
Better storage makes renewable power available when people need it; supports cleaner and cheaper electricity over time; and can reduce the odds of outages rippling through homes, offices, and transit systems.
"Flow batteries have been around in one form or another for almost 150 years," the creator said. "They've never really been losing the battery race. They've kind of just been running in a completely different event."
Where can I learn more?
Switzerland's vanadium project fits into a broader search for storage systems that can cover roles lithium-ion is less suited for. The articles here look at other battery chemistries being developed for longer-duration use and more flexible support for the grid.
• Engineers are pushing iron instead of lithium to cut costs for grid-scale storage.
• Researchers are turning abundant materials into near-perfect battery technology for storing renewable power longer.
All this helps explain why long-duration storage is its own technology race. As utilities gain options beyond lithium, it gets easier to match each grid problem with the right tool.
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