Key Findings
Invinity Energy Systems has been awarded a design contract for a 1.5GW/2.1GWh vanadium redox flow battery (VRFB) system, to be co-located with a data center developed by FlexBase in Switzerland. This groundbreaking project represents the largest VRFB system globally and is hailed as a “world-first” for definitively carving out a niche where flow battery technology is ideally suited to meet the specific power requirements of a data center, which lithium-ion batteries cannot easily satisfy. The system is slated for completion by 2029 and is recognized for its non-flammable characteristics and long-term performance stability.
Technical Details
This 2.1GWh VRFB system maximizes the architectural advantage of flow batteries, which store energy in liquid electrolytes within large tanks, allowing for independent scaling of power and energy capacity. This enables the system to deliver power for significantly longer durations (up to a full day) compared to traditional batteries, capable of supplying 210,000 homes for a day. VRFBs boast superior characteristics compared to lithium-ion batteries, including cycle lives exceeding 20,000 cycles and near-zero capacity degradation over time. Furthermore, their use of aqueous electrolytes makes them inherently non-flammable, a substantial safety advantage. Strategically positioned near a major European power hub, the system will store electricity from variable renewable energy sources, contribute to grid stabilization, and support the burgeoning power demands of new AI data centers.
Background and Industry Context
Energy storage is indispensable for the large-scale integration of intermittent renewable energy sources (such as solar and wind power) into the grid, for grid stabilization, and for meeting the surging power demands of data centers. While lithium-ion batteries are widely used for short-duration storage, flow batteries are increasingly demonstrating clear advantages for applications requiring long-duration storage, non-flammability, and stable performance under extreme temperature conditions. The global market for flow battery technology is valued at US$1.22 billion in 2026, projected to reach US$2.88 billion by 2034, driven by increasing demand for Long Duration Energy Storage (LDES) solutions. U.S. government policies, aimed at reducing dependence on Chinese battery supply chains, are also accelerating the commercialization of non-lithium-based technologies like flow batteries.
Outlook
The FlexBase data center project in Switzerland serves as a crucial proving ground, demonstrating that flow batteries are moving beyond experimental stages to be deployed as practical, gigawatt-hour scale solutions. Its success will not only showcase the reliability and economic viability of flow battery technology globally but also encourage other data center operators and utilities to adopt flow batteries as an alternative or complement to lithium-ion solutions. The escalating power demands of AI data centers, in particular, necessitate stable, safe, and sustainable energy supplies. This project is expected to be a powerful model for how renewable energy and energy storage can collaborate to support future digital infrastructure. Other VRFB developers, such as Richmond Vanadium Technology, are also advancing similar projects with a focus on strengthening domestic supply chains.
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