Microsoft Exits Nscale UK AI Data Centre as Grid Power Slips to the 2030s

Nscale, the British neocloud spun out of Australian cryptocurrency miner Arkon Energy, had positioned its artificial intelligence campus in Loughton, Essex as the centrepiece of its UK ambitions. The site was to be the UK's largest AI supercomputer, initially housing 23,040 Nvidia GB300 GPUs delivered in the first quarter of 2027, with 50 megawatts of AI capacity scalable to 90 megawatts. Microsoft was to be the anchor tenant, drawing on the facility for Azure services across the United Kingdom. Microsoft CEO Satya Nadella said the two companies were proud to announce the UK's largest supercomputer, powered by over 23,000 GPUs.

That plan has now been upended. Microsoft has terminated its anchor tenant agreement for the Loughton campus, according to reports published on October 18, 2026. The withdrawal lands weeks before Nscale's planned initial public offering in New York, a listing that could raise as much as $3 billion and value the company at $35 billion.

The reported sticking point is electricity. UK Power Networks, the distribution network operator that would connect the site to the grid, told Nscale that sufficient grid power may not be available until the 2030s, according to the reports. Without that connection, the 2027 start date is out of reach, and the anchor tenant has walked away.

Nscale says it is not giving up. A spokesperson told reporters: 'We remain committed to both the Loughton project and the UK and we are exploring alternative power sources for the site, in addition to other expansion sites in the UK.' The spokesperson added: 'Our relationship with Microsoft remains strong and long-term, and this unfortunate London-wide grid issue has no impact on our other contracts.' Microsoft did not comment to the Telegraph and did not immediately respond to queries from other outlets.

Key Facts

Reuters reported on October 18 that Microsoft had terminated its agreement for the data centre in Loughton, Essex, citing the Telegraph. The newspaper did not specify why Microsoft withdrew from the project, and Microsoft did not immediately respond to Reuters requests for comment outside regular business hours. The Telegraph report said Nscale had faced repeated delays with the project.

Bloomberg reported on October 18 that authorities had told Nscale they do not expect a power supply to the facility until the 2030s. The same Bloomberg syndicated report noted that Nscale's flagship site in Norway is also six months behind schedule, with only 6.4 megawatts of the intended 30 megawatts data centre up and running. Nscale relies on Microsoft and Anthropic for around 85 per cent of its contracts, going by an IPO filing, and Microsoft had been set to become the anchor tenant at Nscale's first British data centre in Essex.

NeoTeo reported on October 5 that UK Power Networks had told Nscale that sufficient grid power would not be available to the site until the early to mid 2030s. The project was scheduled to begin operating in 2027, and the planned GPU based AI cloud data centre is seeking up to 90 megawatts of capacity. Ofgem figures for June 2026 put 315 data centres awaiting connection in the UK, representing 73 gigawatts of demand, compared with 45 gigawatts of peak energy demand for the country.

The original commitment, announced by Nscale on September 16, 2025, described the Loughton campus as delivering 50 megawatts of AI capacity, scalable to 90 megawatts, and initially housing 23,040 Nvidia GB300 GPUs delivered in the first quarter of 2027. Separately, Nscale, OpenAI and Nvidia were establishing Stargate UK, with OpenAI exploring offtake of up to 8,000 Nvidia GPUs in the first quarter of 2026, potentially scaling to 31,000 GPUs. Nscale was also to deploy 4,600 Nvidia GB300 GPUs with Nvidia DGX Cloud. In total the UK package covered up to 58,640 cutting edge Nvidia GPUs, part of Nscale's broader plans to deploy 300,000 Nvidia GPUs globally.

CNBC reported on September 18 that Nscale filed to go public on the New York Stock Exchange under the ticker symbol NSCL. The company reported a $1.02 billion net loss on $140.6 million in revenue in the six months ended June 30, 2026, according to its prospectus. Revenue was up 1,252 per cent from $10.4 million a year earlier, while the net loss a year earlier was $368.9 million. Nscale pointed to $56.4 billion in remaining performance obligations. As of August 31, the company held 25,000 active GPUs and 461,000 that were either active or contracted, with five active and 12 contracted data centre sites. It had over 1,000 full time employees.

Analysis

The immediate casualty is a project that was supposed to anchor Nscale's UK story. Loughton was not a marginal site. It was the company's first British data centre and the one Microsoft had agreed to anchor. Losing that customer removes the demand that made the economics work on paper, and it does so weeks before the company asks public investors to buy the story.

The bigger picture here is that AI data centre growth is colliding with a physical constraint that money cannot easily solve. Grid connections in the UK are queued years deep, and the queue is growing. Ofgem's June 2026 count of 315 data centres representing 73 gigawatts of demand sits against a national peak demand of 45 gigawatts. That mismatch means even well funded projects can be stranded by infrastructure timelines that stretch into the next decade. Nscale said it was investigating on site power generation and ways to accelerate its grid connection, but those are workarounds, not replacements for a connection that may not arrive until the 2030s.

For Nscale, the concentration risk is severe. TechCrunch reported on September 22 that about 85 per cent of Nscale's contracts come from a $43.8 billion deal to supply Microsoft with compute through 2033 and a $44.6 billion supply agreement with Anthropic. Anthropic's agreement is contingent on Nscale obtaining financing, and the AI lab retains the right to walk away from or cancel the deal if Nscale fails to hit milestones the filing explicitly categorizes as stringent. One unnamed customer accounted for more than half of revenue in the first half of 2026, according to CNBC.

The timing compounds the problem. The IPO was already testing investor appetite for a stock whose revenue is tied primarily to two customers. Rival CoreWeave saw its shares fall approximately 25 per cent in the week before October 18 on concerns about borrowing plans and data centre financing, and Australian data centre developer Firmus recently abandoned its planned IPO after failing to attract sufficient investor demand. Nscale also carries more than $8 billion in debt, excluding a financing arrangement with Dell.

Why It Matters

This is a test case for whether the neocloud model can survive contact with real world infrastructure. Neoclouds like Nscale build large GPU clusters against contracted demand, often financed with debt. If power cannot be delivered on schedule, the revenue that services that debt is delayed or lost. The model depends on hitting milestones, and power is the milestone that no amount of software can accelerate.

It also matters for the UK's AI ambitions. The Loughton site was presented as the UK's largest AI supercomputer, part of a package that covered up to 58,640 Nvidia GPUs. Losing the anchor tenant weeks before a $3 billion IPO sends a signal about how quickly such projects can unravel when grid timelines slip, and it may make other developers think harder about whether the UK can deliver the power their business plans assume.

And it matters for Microsoft, which has been assembling AI capacity across multiple markets. Walking away from a signed anchor deal shows that even the largest buyers will not wait indefinitely for power. Microsoft had been set to take the Loughton capacity for Azure, and its decision to terminate suggests the company is unwilling to carry the schedule risk.

Next Up

Nscale says it is exploring alternative power sources for Loughton, including on site generation, and other expansion sites in the UK. Its IPO, which could raise as much as $3 billion, is still expected as soon as October, though investor sentiment has cooled. The company's Norway site, its flagship, remains six months behind schedule with 6.4 megawatts of 30 megawatts operational.

Whether Nscale can close that gap and find power for Loughton will determine whether the IPO proceeds on the hoped for terms. The company was valued at $14.6 billion in a March 2026 round, and Nvidia has agreed to provide $1 billion in convertible debt as part of a larger $3.1 billion financing deal, as well as guaranteeing up to $860 million on Nscale's obligations for a data centre lease in Texas. Microsoft has not commented. For now, the UK's largest planned AI supercomputer is waiting on a grid connection that may not arrive until the 2030s.