Microsoft Walks Away From UK's Biggest AI Data Centre

Update, Oct. 20: Microsoft finally breaks its silence

Since this article was published, Microsoft has finally spoken. A spokesperson told Reuters on Monday: 'This decision relates to a single site,' while reiterating the company 'remained committed to its partnership with Nscale, including work to build digital infrastructure and support AI growth globally.' Nscale answered in kind: 'Our relationship with Microsoft remains strong and long-term, and this unfortunate London-wide grid issue has no impact on our other contracts,' adding it is exploring alternative power sources for Loughton plus other UK expansion sites. The Times added the scale context the headlines miss: Loughton is understood to make up a small proportion of Nscale's overall $103bn in contracted revenues with Microsoft, which span projects in Portugal, the US and Norway — though the Norway site is also behind schedule. And the structural fix may be coming: PropertyWeek reports Ofgem has tasked infrastructure firm United Infrastructure with developing standardised electricity connection archetypes for UK data centres — precisely the bottleneck this story is about, and part of the same grid crunch behind Ofgem's warning that 315 data centres want twice Britain's power.

By Daniel Rao, London — with reporting by the TechPulse USA newsroom

Britain's biggest AI data centre was supposed to be the proof that the country's sovereign-AI ambitions were real. Instead it is becoming the proof of something else: you cannot download electricity. Microsoft has walked away from Nscale's £2 billion AI data-centre project in Loughton, Essex, after the company was told the site will not get its grid connection until the 2030s — taking with it the only publicly announced customer the project had.

The BBC reported on Monday that Microsoft — which had pledged to fund a supercomputer at the site — has terminated its involvement. The news follows a Sunday report in The Telegraph that UK Power Networks, the company that owns and maintains the electricity grid across London and south-east England, informed Nscale the site's power connection will not happen until the 2030s; The Guardian puts the date at early to mid-2030s. The site had been due to receive power by the end of 2026. Microsoft declined to comment — the time-honoured shrug of a company with nothing to gain from talking.

(Illustrative) Server racks in a data centre hall. Nscale's £2 billion Loughton project was promoted as the UK's largest AI data centre — before its grid connection slipped to the 2030s. Photo: Carl Lender via Wikimedia Commons, CC BY 2.0.

Twelve months of fanfare, ended by a substation

Rewind the tape and the whiplash is the story. Last year Nscale announced its £2 billion pledge to build and open the Loughton facility, promoted at the time as the country's "largest UK sovereign AI datacentre". The project earned a spotlight from then-prime minister Sir Keir Starmer as part of Britain's AI strategy for 2025 — the political establishment's seal of approval. Then, only last month, Microsoft announced that some of its $30 billion (£22 billion) UK investment would fund the Loughton supercomputer, binding the world's most valuable company to Britain's boldest AI bet.

Weeks later, the whole thing is hostage to copper and cable.

We ran the dates: pledged in 2025, power promised by the end of 2026, connection now pencilled in for the 2030s. That is a slip of roughly a decade on the one input nothing in AI works without. No chip, however advanced, computes on good intentions.

A note on our own process, because it matters: this newsroom saw the story on Sunday, when only The Telegraph had it, and killed it as single-sourced. The BBC and The Guardian have now corroborated the substance — Microsoft out, power delayed a decade — which is why it is on this page and not in our notebook.

What dies with the deal — and what survives

The immediate casualties are concrete. The Loughton site was expected to create 250 permanent jobs when it opened. And Microsoft, per The Guardian, was Nscale's only publicly announced customer for the site — so the project has lost, in one move, both its anchor tenant and its biggest public validation.

Nscale, to its credit, is not conceding the project. "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," a company spokesperson told the BBC. The same spokesperson insisted the corporate relationship is intact — "Our relationship with Microsoft remains strong and long-term" — and that "this unfortunate London-wide grid issue has no impact on our other contracts."

Take the statements at face value — the second and third are doing the heavy lifting — and Nscale's position is: the site is delayed, the customer is not lost, the pipeline is fine. The company and Microsoft continue to work together on projects in Norway, Portugal and the United States, so the partnership is genuinely bigger than Loughton. But there is no spinning the first fact: "alternative power sources" is what you say when the grid you planned on will not arrive for a decade, and it is a long way from the end-2026 switch-on that was sold last year.

An IPO with a power problem

The timing could hardly be worse for Nscale's bankers. The British neocloud has filed for a New York IPO that aims to raise up to $3 billion at a valuation of approximately $29 billion, according to Investor's Business Daily; City AM has reported the target could stretch as high as $35 billion. The board reads like a Davos seating plan — former deputy prime minister Nick Clegg and ex-Meta executive Sheryl Sandberg both sit on it — and the backstory is pure 2026: the company is backed by Nvidia, lost a net $1 billion in the first half of 2026 against just $141 million of revenue (mostly non-cash charges, per the filing), and is racing to go public before the market decides what a neocloud is actually worth.

Loughton was supposed to be the exhibit A in that pitch: a flagship, state-blessed, Microsoft-anchored AI campus proving Nscale could build at hyperscaler scale. Exhibits do not usually lose their anchor tenant a year out — certainly not to the electricity grid.

That is the wider anxiety hanging over the whole category. Neoclouds — the specialist GPU clouds renting AI compute at industrial scale — generally borrow at high rates, with their agreements backstopped by customers and chip providers, IBD notes. When rates wobble, the entire financing stack feels it. Goldman Sachs analyst Gabriela Borges upgraded CoreWeave to buy on Monday — she "said CoreWeave's contract economics are stronger than 'neocloud' peers," according to Investor's Business Daily — but she still cut the price target to $106 from $129, which tells you how the bank really feels. CoreWeave shares bounced a little over 1% to $62.31 on the day, having fallen 30% in October and 14% this year. The rest of the sector is not resting easy either: IBD lists Nebius, IREN, Hut 8, Cipher Digital and Applied Digital among the shares under pressure.

The real constraint was never the chips

Here is the judgment, and I will not dress it up: the AI race is increasingly being won and lost by electricians, not engineers. Money is abundant. Chips are available. The binding constraint — the thing that kills a £2 billion project with a Microsoft contract attached — is a grid connection with hundreds of megawatts of deliverable power, permitted, cooled, and already wired. We have written before that the grid connection is the real asset in the AI land rush; Loughton is that thesis arriving in Britain with a decade attached.

(Illustrative) High-voltage transmission lines in England. UK Power Networks, which owns and maintains the grid across London and the south-east, told Nscale the Loughton connection will not arrive until the 2030s. Photo: Geographer via Wikimedia Commons, CC BY-SA 2.0.

The botched part of this story is not Nscale's engineering. It is the planning — a sovereign-AI flagship announced, spotlighted by a prime minister, and sold to the public on an end-2026 power date, when the company that actually owns the wires says 2030s. Somewhere between the press release and the substation, nobody did the arithmetic that mattered. This is not the first time this week the grid has asserted itself either: only yesterday NextDC halted trading in Melbourne because it cannot say when power will reach its M3 data centre. Two continents, one week, same punchline.

Which brings the whole thing back to the question Britain's AI strategy has to answer. Whether the country can wire its ambitions will decide whether "sovereign AI" is a plan or a press release. The Loughton site may yet get built — Nscale is exploring alternatives, and a decade is a long time in energy — but the 2025 version of this project, the one with a prime minister's blessing and Microsoft's money and an end-2026 switch-on, is dead. It was killed by the least futuristic thing imaginable: not enough power lines in Essex.

Frequently asked questions

Why did Microsoft pull out of the Nscale data centre in Loughton?

UK Power Networks, which owns and maintains the electricity grid across London and south-east England, told Nscale the Loughton site's power connection will not happen until the 2030s — The Guardian narrows it to early to mid-2030s — instead of the end of 2026 as planned. The BBC understands Microsoft, which had pledged to fund a supercomputer at the site, then terminated its involvement. Microsoft declined to comment.

Where is Nscale's Loughton data centre and how big was it meant to be?

Loughton, in Essex, north-east of London. Nscale pledged £2 billion last year to build and open what was promoted as the country's "largest UK sovereign AI datacentre", expected to create 250 permanent jobs. It was spotlighted by Sir Keir Starmer as part of the UK's 2025 AI strategy.

Who is Nscale?

A British "neocloud" — a specialist cloud provider renting out GPU compute for AI workloads. It is backed by Nvidia, has filed for a New York IPO aiming to raise up to $3 billion at a roughly $29 billion valuation (City AM reports the target could be up to $35 billion), and counts former deputy PM Nick Clegg and ex-Meta executive Sheryl Sandberg on its board. In the first half of 2026 it reported a net loss of $1 billion against $141 million in revenue, mostly non-cash charges.

Will the Loughton data centre still be built?

Nscale says yes: it told the BBC it remains committed to the Loughton project and the UK, and is exploring alternative power sources for the site alongside other UK expansion sites. No timeline has been given for the alternatives.

Is Microsoft still working with Nscale?

Yes — on other projects. Nscale said its relationship with Microsoft "remains strong and long-term", and the two companies continue to work together in Norway, Portugal and the United States. Microsoft was, however, Nscale's only publicly announced customer for the Loughton site itself, per The Guardian.

How many GPUs was Loughton getting?

23,040 Nvidia GB300 GPUs providing 50 megawatts of AI computing capacity to power Microsoft's Azure services in Britain, according to the companies last year (Reuters).

Is Nscale still committed to Loughton?

'We remain committed to both the Loughton project and the UK, and we are exploring alternative power sources for the site, as well as other expansion sites in the UK,' an Nscale spokesperson told Reuters.

Sources

BBC (Oct 19, 2026); The Telegraph (Oct 18, 2026); The Guardian; Investor's Business Daily (Oct 19, 2026); City AM via Business Live. Additional context from TechPulse USA's own reporting. We did not rely on the Medium modeldexnews piece.

Daniel Rao is TechPulse USA's editor. He covers the collision between the AI buildout and the physical world — grids, suburbs, and the people who live in them.