A major new long-duration energy storage project in East Sussex is set to strengthen Britain’s renewable energy capacity, while reducing reliance on imported fossil fuels. Invinity Energy Systems has completed construction of the Copwood VFB Energy Hub in Uckfield, which will become Europe’s largest vanadium flow battery installation when it connects to the grid later this year. The 20.7MWh system is paired with a 3MW solar array, allowing exces…