Image: Invinity London-listed Invinity Energy Systems has delivered 20.7 megawatt-hours of vanadium flow batteries to the Copwood VFB Energy Hub in East Sussex. Once the project enters service later in 2026, Invinity says it will be Europe’s largest vanadium flow battery installation. The project combines 90 vanadium flow batteries with a 3 MW solar array. The batteries will store extra solar energy generated during the day and send it back to the grid in the evening, overnight, and during periods of high demand. Invinity says the battery system can store roughly enough electricity to cover the daily needs of around 3,000 homes. What makes vanadium flow batteries different Vanadium flow batteries are best suited for long-duration storage. They use vanadium ions in a liquid electrolyte to store energy for hours at a time and discharge it later when electricity demand rises. Because they have a low energy density, they require large containers and a large footprint. Advertisement – scroll for more content They’re useful for “energy shifting” – moving cheap renewable electricity generated during the day …