Every battery storage unit on Great Britain’s grid

Great Britain has 202 battery storage units in the balancing mechanism, run by 48 operators. 127 are registered directly, with 6,520 MW of discharge capacity between them, and 75 are aggregated units adding a further 2,604 MW. Together the fleet can charge at up to 9,466 MW. The registry was built on 28 August 2026 from Elexon’s balancing mechanism unit register; the table below is the whole of it.

Elexon publishes no battery fuel type, so the fleet is identified from three signals: the unit naming convention that marks storage units, registered unit names containing BESS or battery, and units whose physical notifications go meaningfully both ways once conventional two-way plant (pumped hydro and the interconnectors) has been excluded. Directly registered units are counted with confidence. Aggregated units, where an optimiser trades a portfolio under one identifier, are marked separately because a small amount of demand response is mixed in with the batteries.

What the fleet is doing right now, half hour by half hour, is on the battery storage section of the live dashboard. The registry is also published as JSON, and the full method is under How this works.