TL;DR:

  • More than 80% of the UK’s datacentre capacity sits in and around London, with West London — including Slough’s 35-plus facilities and the Heathrow cluster — approaching saturation on land and grid.
  • DSIT is using the AI Opportunities Action Plan to route operators outside London, with AI Growth Zones offering streamlined planning, priority grid access and targeted energy price support to steer capacity to where power is available.
  • UK electricity prices remain roughly four times US levels by Institute of Economic Affairs estimates — and OpenAI’s UK Stargate site has already been paused citing energy cost and regulatory friction.

The geographic rebalancing of UK datacentre capacity is both a supply-side necessity and a deliberate policy lever. West London’s saturation is real — Slough alone has more datacentres than most UK cities have pubs — and the shift north and into Scotland is being framed as capacity relief rather than London abandonment. DSIT’s tool here is the AI Growth Zone, a planning-and-grid fast-track that ties priority access to locations where power genuinely exists.

Why the workload changed the geography

For years, datacentre siting was dominated by proximity to the City of London, driven by low-latency financial-services requirements. AI workloads — training runs and bulk inference — relax that constraint substantially. The trade-off flips: land cost, grid capacity and power pricing start to outweigh latency. That changes the attractive set for operators and gives DSIT a realistic story about steering capacity to Scotland (where wind generation exceeds transmission capacity), the North East and Wales.

The policy tension

DSIT’s plan pairs two otherwise awkward priorities: positioning the UK at the frontier of AI, and shielding the grid from uncontrolled demand growth. The Science, Innovation and Technology Committee has opened an inquiry into whether emerging low-energy compute architectures can change the slope of the power curve — an explicit acknowledgement that current projections are unsustainable. AI-specific “price support” is a politically delicate mechanism that works against broader household-bill pressures, but the scale of projected capacity makes passive pricing untenable.

Looking forward

Two watch-items over the next six months. First, whether OpenAI’s paused Stargate site restarts under AI Growth Zone terms — or whether the pause becomes permanent relocation, as Ireland and the Nordics continue to absorb the workloads UK pricing deters. Second, whether the Science, Innovation and Technology Committee’s inquiry produces actionable recommendations on low-energy compute, or whether it lands as another advisory report. On current trajectory, the UK builds more datacentre capacity than grid capacity to serve it — and that is the arithmetic DSIT now needs to visibly close.

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