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Microsoft Walked Away From a 23,000-GPU AI Data Centre in Essex Because the Grid Can't Power It Until the 2030s

Microsoft has pulled out of anchoring Nscale's AI data centre in Loughton, Essex, which was to house 23,040 Nvidia GB300 chips from 2027, The Telegraph and Reuters reported on October 18–19, 2026. Grid officials told Nscale they did not expect to supply power until the 2030s. Microsoft said the decision "relates to a single site." Nscale, which filed for a US listing last month, says its other contracts are unaffected.

Oct 25, 2026

The constraint on the AI build-out in this story is not chips or money but electricity. Microsoft has ended its agreement to anchor a flagship data centre that Nscale, a British AI cloud provider backed by Nvidia, is developing in Loughton, Essex, according to a report in The Telegraph on Sunday, October 18, 2026, confirmed by Reuters. The site was to host 23,040 Nvidia GB300 graphics processors and provide 50 megawatts of AI computing capacity for Microsoft's Azure services in Britain, starting early next year. National grid officials had told Nscale they did not expect to be able to supply power to the site until the 2030s.

Both companies described it as a contained setback. "This decision relates to a single site," a Microsoft spokesperson said on Monday, adding that the company remained committed to its partnership with Nscale. An Nscale spokesperson called the problem "an unfortunate London-wide grid issue" with no impact on its other contracts, said the relationship with Microsoft "remains strong and long-term," and said the company was exploring alternative power sources for Loughton and other UK sites. The project had been announced during President Donald Trump's state visit to Britain in September 2025 as the country's largest AI supercomputer.

The financial context is what made the report a market story. Nscale filed for a US initial public offering in September, and its prospectus names Microsoft and Anthropic among its major customers; its total contracted value has grown from $100 million to more than $103 billion in about two and a half years, Reuters reported, and The Telegraph said Microsoft alone accounts for more than 40% of that, although Loughton is believed to be a small part of it. Nscale competes with CoreWeave, Nebius, Crusoe and Lambda, the so-called neoclouds whose debt has come under heavy pressure this month, and an IPO depends on investors believing that contracted value turns into revenue on schedule.

The power problem is not unique to Essex. Reuters noted that grid connection queues have delayed data-centre projects in Britain by as long as 13 years, and the same week S&P Global said hyperscalers are likely to carry more AI-linked obligations than they disclose, many of them in exactly this kind of long-term commitment to a third party's site. A contract for capacity that cannot be switched on is an asset on one company's books and a cancellable option on the other's, and Loughton showed which side holds the option.

For readers following the AI trade, the useful habit is to treat announced capacity and contracted value as plans with dependencies, not as delivered revenue. The dependencies are chips, financing, permits and, increasingly, a grid connection with a date on it. When the date moves into the next decade, as it did here, the customer can leave, and in this case did.

Sources: Reuters via The Star — Microsoft pulls out of UK data center deal with Nscale, Telegraph reports (Oct 18–19, 2026); Reuters via Business Day — Microsoft pulls out of UK data centre project (Oct 18, 2026); Computing — Microsoft pulls out of Nscale deal, putting $35bn IPO at risk (Oct 2026)