UK energy storage manufacturer Invinity Energy Systems plc (<a href="https://www.londonstockexchange.com/stock/IES/invinity-energy-systems-plc/company-page" target="_blank">AIM:IES</a>) on Tuesday said it has signed a partnership and master supply agreement with UK-based energy infrastructure developer Frontier Power Ltd, targeting the deployment of up to 2 GWh of Invinity's vanadium flow batteries.