Read More Energy Industry News Invinity (AIM: IES) shares fall 20% despite Ofgem backing for 520 MWh Frontier Legacy project Ofgem has provisionally selected the Frontier Legacy long-duration storage project using Invinity’s vanadium flow batteries, but IES shares plunged as investors confronted the limited award, financial-assessment concerns and delivery risk. byVenkateshJune 26, 2026