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Slough
Nation / PlaceGB

Slough

Berkshire town; UK's densest data-centre cluster, grid exhausted as of 2026.

Last refreshed: 22 April 2026

Key Question

With 35 data centres and no grid headroom left, where does Britain's AI infrastructure grow next?

Timeline for Slough

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Common Questions
Why is Slough running out of data centre space?
Slough hosts 35 data centres and West London's electricity grid is now fully committed, meaning no further large-scale capacity can be added without new grid infrastructure.Source: The Register
Where are UK data centres moving after Slough?
The UK Government's AI Growth Zones are redirecting data-centre investment to Scotland and northern England, where wind power is abundant and electricity discounts of up to 25% are available.Source: UK Industrial Strategy Quarterly Update
How many data centres does Slough have?
Slough has 35 data centres as of 2026, making it the UK's most concentrated data-centre cluster, but grid saturation means no new large facilities can be connected.Source: The Register

Background

Slough emerged as Britain's most acute data-centre saturation point in April 2026, when The Register reported that the town's 35 data centres had pushed West London's grid capacity to its limit. The cluster cannot grow further on its current grid, forcing hyperscalers and colocation operators to look north for the next generation of AI compute.

Slough is a large town in Berkshire, roughly 20 miles west of central London. Its position at the junction of the M4 corridor and Heathrow's low-latency fibre routes made it the default choice for UK data-centre investment from the late 1990s onwards. The town hosts a disproportionate share of UK digital infrastructure relative to its population, with major colocation campuses operated by global operators attracted by proximity to London's financial and media industries.

The saturation of Slough's grid is a policy inflection point. The government's AI Growth Zones programme is designed precisely to redirect capacity investment to Scotland and northern England, where wind generation is abundant and electricity-bill discounts of up to 25% are available. Slough's constraint is the clearest evidence yet that geographic dispersal is no longer optional for AI workloads.