Invinity Copwood VFB Energy Hub

Located in East Sussex, UK, this ground-breaking co-located VFB and PV LDES project will enable excess solar energy generated during the day to be stored and discharged onto the UK grid through a single point of connection during peak periods and overnight as required. The VFB will also provide valuable flexibility to the UK grid, including, but not limited to, the provision of Dynamic Response Services, participation in the Capacity Market and undertaking wholesale power trading activity in the Day Ahead and Intraday markets.

Timelapse footage showing Invinity VFBs departing Motherwell, UK and being installed at the Copwood site, East Sussex, UK.

Made in the Company’s Scottish facilities, these vanadium flow batteries, alongside the site design, offer a number of important operational benefits. These include:

• 3 to 18 hours of energy dispatch
• No fire risk
• Over 30 years of operation with no loss of capacity
• Fast response services through c.15ms DC response time
• Low noise levels

The project also incorporates a number of important environmental initiatives to demonstrate the values of considerate construction and long-term land stewardship. A notable initiative to support the batteries on the site is the use of ground screw piling, which allows for:

• Around 80% reduction in carbon emissions compared to using concrete foundations
• Quick installation and minimal ground disruption
• Reduced need for heavy machinery

Combined with the sustainability benefits of Invinity’s vanadium flow battery technology, this project is playing a critical role in demonstrating the long-term environmental benefits of using safe and durable battery technology to support the UK’s clean energy transition.

Renewable energy generation and deployment in the UK is continuing to break records – in 2025, 14 GW of solar was generated on 8 July and 22.7 GW of wind was generated on 11 November alone. Balancing these increasing volumes of solar and wind energy on the grid is now an increasingly important priority. However, the UK still relies heavily on costly gas-peaker turbines and expensive curtailment payments to renewable generators to manage the system, leading to continued high energy costs for businesses and consumers and gigawatts of wasted, low-cost clean energy.

Long duration energy storage (LDES) is the key to stopping reliance on these costly measures. It unlocks the power of renewable energy on demand and is a vital step on the path to a clean, secure and low-cost energy future. The Invinity Copwood VFB Energy Hub, partially funded by the UK Government’s Department for Energy Security and Net Zero (DESNZ), is designed to serve as an important template for grids and developers around the world that will demonstrate:

• how long duration energy storage is the flexible solution to balance intermittent renewable power, by dispatching it when it is needed;
• why battery energy storage is a highly suitable solution to removing fossil-fuels from energy generation; and
• the value of safe, non-flammable vanadium flow battery technology.

Above: a view of the installed VFBs onsite – December 2025

The Longer Duration Energy Storage (“LoDES”) Demonstration Competition was part of the UK Government’s 10-Point Plan to help accelerate commercialisation of innovative LDES projects to support the UK’s journey towards Net Zero. Invinity’s work throughout the competition saw it secure the maximum £10 million of grant funding available to support the deployment of this first-of-a-kind project.

Invinity secured approval to proceed with the project in March 2025. Planning permission was subsequently secured in August 2025 and construction of the project site began in November 2025.