Microsoft has terminated its agreement to invest in Nscale’s flagship £2bn AI data centre in Loughton, Essex, dealing a blow to Britain’s infrastructure ambitions and casting uncertainty over the startup’s multi-billion-dollar stock market flotation.

The high-profile project, which was announced in a fanfare of publicity just last year as part of Microsoft’s wider £22bn UK investment pledge, was intended to house thousands of high-end Nvidia AI chips and serve as the cornerstone of Britain’s sovereign AI capabilities.

However, the deal collapsed after grid operators informed Nscale that the facility’s required power supply would not be delivered until the 2030s due to severe London-wide grid constraints.

Microsoft’s exit leaves the Loughton site in limbo. As Nscale’s anchor tenant, Microsoft had agreed to rent 23,000 Nvidia chips at the facility, and its withdrawal removes crucial revenue assurance. The loss comes at a delicate time for Nscale, which is attempting to push ahead with a massive Wall Street flotation valuing the company at up to $35bn (£26bn).

With rival neocloud developers experiencing severe share price slumps amid investor scepticism over debt-heavy AI infrastructure, the collapse of the Microsoft partnership threatens to undermine confidence in Nscale’s broader business model.

Despite the setback, Nscale insists it remains committed to the UK project and is actively exploring alternative power sources for the site, alongside other expansion locations. The company emphasised that its wider relationship with Microsoft remains strong, with both tech giants continuing to collaborate on international projects in Norway, Portugal and the United States.

For the local economy in Essex, the long-term outlook remains uncertain. The data centre was projected to generate 250 permanent jobs upon completion.

While Nscale maintains that its other global contracts are unaffected, the cancellation highlights the severe grid connection delays and infrastructure hurdles threatening Britain’s broader aspirations to become a global leader in artificial intelligence.

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