Nscale’s UK supercomputer project delayed until mid-2030s due to power grid bottleneck

The UK’s largest planned AI supercomputer, a project the government enthusiastically championed as a pillar of its artificial intelligence strategy, won’t be switching on next year as promised. It might not switch on until the mid-2030s.

Nscale, the London-based AI infrastructure company backed by Nvidia, has hit a wall that no amount of GPU horsepower can solve: the electricity grid simply can’t deliver the juice. UK Power Networks has told the company that the 90 MW connection needed for its Loughton, Essex facility isn’t feasible within the original timeline, thanks to severe congestion on Britain’s power grid.

A scaffolding yard where a supercomputer should be

The Loughton data centre was supposed to be a crown jewel. Announced in 2025 as part of the UK government’s AI Opportunities Action Plan, it was designed to host thousands of Nvidia GPUs deployed by Microsoft, the project’s anchor tenant. Initial capacity was set at 50 MW, with plans to scale to 90 MW.

Instead, as recently as March 2026, the site was being used as an operational scaffolding yard. Planning permission has been secured, the corporate commitments are in place, and the hardware partnerships are lined up.

The grid connection delays were first flagged in July 2026, with revised availability now pushed out to the early-to-mid-2030s.

The UK’s power problem is bigger than one data centre

Over 100 data centre projects across the UK are reportedly considering on-site power generation as an alternative to waiting for grid connections that can stretch beyond a decade.

Nscale is already exploring workarounds. The company is evaluating on-site solutions including solid-oxide fuel cells manufactured by Bloom Energy, a technology that generates electricity through an electrochemical process rather than combustion.

Nscale’s bigger picture

Despite the Loughton delays, Nscale isn’t standing still. The company is eyeing a US IPO that could value it at around $3 billion. Beyond the UK, Nscale is developing facilities in Norway, Portugal, and the United States.

Microsoft’s commitment as anchor tenant at Loughton also suggests the project hasn’t been written off. Deploying thousands of Nvidia GPUs at a single site represents a substantial investment in compute capacity.

For the UK government, however, the optics are less flattering. The AI Opportunities Action Plan was designed to position Britain as a global leader in artificial intelligence. Having its flagship supercomputer project delayed by something as fundamental as electricity access undercuts that narrative considerably.

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