Invinity Accelerates Commercialisation of Vanadium Flow Batteries as Global Demand for Long-Duration Energy Storage Grows
Date: 23 Sep 2026 |
Invinity Energy Systems has reported strong commercial momentum for its vanadium flow battery (VFB) technology, with growing orders, major utility-scale projects and a rapidly expanding commercial pipeline highlighting the increasing role of VFBs in long-duration energy storage.
In its 2026 Interim Results, published on 22 September, Invinity reported a 192% year-on-year increase in customer orders during the first half of 2026. Its year-to-date contracted order book reached 77 MWh, for delivery across 2027 and 2028, alongside engineering work on the landmark 1.5 GWh FlexBase project.
The company now reports an approximately 12.8 GWh commercial pipeline for FY2026–28, dominated by opportunities in North America and Europe. Renewable energy developers account for around 8.8 GWh of the pipeline, while data centres represent approximately 3.3 GWh, demonstrating the widening range of applications for large-scale VFB technology.
Major Endurium Projects Move Forward
Invinity's latest-generation Endurium VFB is increasingly being deployed in larger-scale projects.
In the United States, the company has been contracted to supply 43 MWh of Endurium VFBs to Dairyland Power Cooperative across multiple sites in the U.S. Midwest. The batteries will provide long-duration charge and discharge capability to support grid resilience and reliability. Supported by funding from the U.S. Department of Energy, the project is Invinity's largest U.S. deal to date, with deliveries expected to begin in 2027.
In California, Invinity will supply a 32 MWh Endurium VFB to Pacific Steel Group's Mojave Micro Mill, alongside 40 MWp of solar PV. The project is supported by the California Energy Commission and represents what Invinity describes as the largest single VFB installation in the United States.
Meanwhile, in the UK, Invinity has delivered a 20.7 MWh VFB for the Copwood VFB Energy Hub in East Sussex, described by the company as Europe's largest flow battery installation. Co-located with 3 MWp of solar PV, the system will provide services including grid balancing and energy trading.
1.5 GWh VFB Highlights Emerging AI Opportunity
One of Invinity's most significant developments is the FlexBase Technology Centre in Laufenburg, Switzerland, where Invinity is the exclusive partner designing a vanadium battery solution with 1.5 GWh of initial capacity and potential phased expansion to 2.1 GWh.
The battery is intended to support a 500 MW AI data centre and the European grid network. Engineering is underway through 2026–27, with fulfilment scheduled to commence from 2027.
The project points to a potentially important new application for VFBs as AI and data-centre growth increases demand for flexible, high-throughput energy storage. Invinity's presentation cites independent analysis estimating a £45.5 billion addressable AI data-centre market by 2035, with approximately 60% identified as applications where VFBs could outperform lithium-ion batteries under the assumptions of the analysis.
Cost Reductions Strengthen VFB Competitiveness
Invinity also reported substantial progress in reducing battery costs. The company states that a 60% cost reductionwas achieved during the VS3 product lifecycle and forecasts that Q1 2027 Endurium costs will be 66% lower than VS3.
Its cost-reduction programme is currently tracking around 18 months ahead of management expectations, with further reductions planned through value engineering, higher-volume manufacturing, sourcing optimisation and strategic partnerships. Invinity's longer-term objective is to achieve upfront capital-cost competitiveness with lithium-ion batteries by 2030.
Growing Global Footprint for Vanadium Flow Batteries
Invinity reports more than 2,000 batteries delivered, over 11 GWh dispatched from its fleet since 2022, and approximately 100 projects across 17 countries on five continents. Its product offering is scalable from MWh to GWh applications.
The company's VFB systems offer discharge durations ranging from two to 24 hours, together with flexible operation, long cycling capability and inherent safety without the risk of thermal runaway. These characteristics make VFBs particularly relevant to electricity systems requiring frequent cycling, integration of renewable generation and long-duration storage.
The combination of larger projects, expanding manufacturing, falling costs and new applications such as AI data centres illustrates the continued progress of vanadium flow batteries from established technology towards increasingly large-scale commercial deployment.
Source: Invinity Energy Systems, 2026 Interim Results, 22 September 2026.