Great Britain’s first Long Duration Electricity Storage (LDES) cap and floor scheme has reached its Minded to Decision stage, and Ofgem is at the heart of one of the most significant regulatory move for the storage sector. This keynote will walk through the regulator’s rationale for the 16 projects provisionally selected, covering pumped storage hydro, compressed air, lithium ion and vanadium flow batteries, and explain what a roughly 7.65GW LDES portfolio actually means for a grid increasingly reliant on renewables and vulnerable to extended periods of low wind and solar generation.