Stargate UK data centre project: OpenAI site visit gaps and unverified pledges draw scrutiny

The Stargate UK data centre project, a flagship initiative between OpenAI, Nvidia, and British cloud provider Nscale, faces intensifying scrutiny after a Guardian investigation found that OpenAI apparently never visited the site earmarked for its primary data centre location before the project was announced. The project was unveiled in September 2025 during Donald Trump's state visit to the UK, but was formally paused in April 2026 due to high UK electricity costs and unresolved regulatory questions. The revelations also highlight a pattern where UK government AI investment pledges rely on self-reported company commitments that are not audited or verified.

What happened

Stargate UK promised up to 8,000 Nvidia GPUs deployed at sites in north-east England by Q1 2026, scalable to 31,000 over time. It was part of a broader £31 billion package of tech investments the government presented as proof of Britain's AI competitiveness. By April 2026, OpenAI officially paused the project, citing high energy costs and ongoing regulatory uncertainty around AI and copyright.

A Guardian investigation found that OpenAI apparently never visited the Loughton, Essex site for Nscale's planned supercomputer. Earlier reporting from March 2026 described the site as a functioning scaffolding yard with no evidence of construction. Land records showed the site was still registered to a different company, contradicting Nscale's claim that it had purchased the land. No planning applications had been lodged, and no construction had begun at Cobalt Park, the primary Stargate UK site near Newcastle.

Meanwhile, Nscale redirected significant resources to Portugal, investing €695 million to supply 66,000 Nvidia Rubin GPUs to a Microsoft data centre campus in Sines, where energy prices and planning conditions are more favourable. Nscale's smaller UK project with BT and Nvidia, providing up to 14 megawatts of sovereign AI capacity across three existing BT sites, is proceeding but at a fraction of Stargate UK's original scale.

Why AI builders should care

For AI builders evaluating where to host inference or training workloads, this episode underscores the gap between announced commitments and verifiable infrastructure. The UK government's AI Opportunities Action Plan cited £14 billion in private commitments to UK AI infrastructure, but those figures rely on company self-reporting rather than audited disclosures. The Department for Science, Innovation and Technology admitted it was "not playing an active role in auditing these commitments."

If you are planning GPU-intensive workloads in the UK, verified data centre capacity may be far lower than press releases suggest. Projects in regions with cheaper energy, such as the Nordics or Portugal, may advance faster even if announced later. The UK’s industrial electricity costs are roughly four times higher than in the United States, Finland, Norway, and Sweden, a structural disadvantage that directly affects data centre economics and build timelines.

Practical implications

• Verify infrastructure commitments: Treat announced data centre projects as aspirational until planning applications are filed, land is purchased, and construction begins. Check local land records and planning authority websites rather than relying on press releases.
• Factor energy costs into compute planning: High UK electricity prices make it unlikely that large-scale GPU clusters will be built there quickly. If you need low-latency inference in the UK, consider sovereign AI capacity at existing BT sites, but expect constrained availability.
• Consider alternative regions: Portugal’s Sines data centre campus, with cheaper energy and streamlined planning, is attracting major GPU allocations from Nscale and Microsoft. Other European locations with competitive energy prices may offer faster timelines for GPU access.
• Distinguish between pledges and delivery: The UK government’s tally of AI investment includes unverified self-reported figures. When planning reliance on UK-based compute, demand verifiable milestones or contracts rather than announcement-stage numbers.

Caveats

• OpenAI’s formal pause statement indicated the company may revisit Stargate UK when regulation and energy costs allow long-term investment. The project is paused, not cancelled outright.
• The Guardian investigation relied on site visits, land records, and responses from government departments and companies. OpenAI declined to confirm or deny the site visit, referring to its previous pause statement.
• Nscale’s smaller UK project with BT is proceeding and does represent some sovereign AI capacity, even if far smaller than original Stargate UK ambitions.
• The UK government continues to announce AI investment pledges, including at London Tech Week in June 2026, which may or may not face the same verification challenges.

FAQs

What is Stargate UK and who is involved?

Stargate UK was a data centre project announced in September 2025 as a partnership between OpenAI, Nvidia, and British cloud provider Nscale. It aimed to deploy thousands of Nvidia GPUs across UK sites to support AI compute capacity. The project was formally paused in April 2026.

Why did OpenAI pause Stargate UK?

OpenAI paused Stargate UK in April 2026 citing high industrial electricity costs in Britain, which are roughly four times higher than in the US, Finland, Norway, and Sweden, as well as unresolved regulatory questions around AI and copyright. A spokesperson stated the company may revisit the project when regulation and energy costs enable long-term infrastructure investment.

Did OpenAI ever visit the Stargate UK site?

According to a Guardian investigation, OpenAI apparently never visited the key site in Loughton, Essex that was earmarked for the project before it was announced. An OpenAI spokesperson referred the Guardian to the company's previous statement about pausing the project.

What were the promised capabilities of Stargate UK data centres?

The project promised up to 8,000 Nvidia GPUs deployed at sites in north-east England by Q1 2026, scalable to 31,000 over time. Nscale separately claimed it would have 23,040 Nvidia GPUs running at the Loughton site by early 2027. No planning applications were lodged and no construction began.

How do energy costs affect UK AI projects like Stargate UK?

UK industrial electricity prices are roughly four times higher than in the US, Finland, Norway, and Sweden. This makes large-scale GPU data centres economically challenging compared to regions with cheaper energy. Microsoft and Nscale redirected significant GPU investments to Portugal (Sines), where energy and regulatory conditions are more favourable.

What is the current status of Stargate UK and related investments?

Stargate UK is paused, with no construction or planning applications at its primary sites. Nscale's smaller UK project with BT providing up to 14 megawatts of sovereign AI capacity is proceeding. The UK government continues to announce AI investment pledges, but these rely on self-reported company figures that are not independently audited.