Nscale IPO Faces Microsoft Exit as UK Power Wait Runs to the 2030s

Microsoft has pulled out of the Loughton, Essex data centre where it was contracted to be the anchor tenant, because UK Power Networks has told Nscale that the site will not get enough grid power until the early 2030s. The exit, first reported by the Telegraph on Sunday, October 18, lands days before Nscale's planned New York IPO, in which the AI cloud startup is seeking up to $3 billion, and it pulls one of the two customers that dominate its contract book out of its first UK facility.

Nscale pitched Loughton as the largest “UK sovereign” AI data centre, housing thousands of Nvidia chips and billed alongside the company's claim that it could become a national champion for Britain. Microsoft was due to fund a supercomputer at the site as part of the roughly $30 billion (£22 billion) of UK investment the company announced last year, and it committed to rent 23,000 Nvidia AI chips there, according to reporting by the Press Association carried by Yahoo Finance. The cancellation leaves the site with no announced customer for that capacity.

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The chain: spender, supplier, constraint

The break in the deal is a working example of the exact constraint the ai data centre buildout is running into across Europe. The money to build the facility was committed, and the customer agreeing to buy the chips was in place. What broke the chain was not demand but power. Nscale was told by grid operator UK Power Networks that it would not gain access to enough grid power until the early 2030s, a timetable that made the planned opening next year untenable for an anchor tenant that needs the compute running.

Nscale says it remains committed to both the Loughton project and the UK and is exploring alternative power sources, plus other expansion sites in Britain. A spokesperson told the BBC that the company's relationship with Microsoft remains strong and long-term, and that the “unfortunate London-wide grid issue” has no impact on its other contracts. Microsoft declined to comment. The company had been expected to help power its Azure cloud services from the site.

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What the filing says about the customers

The timing matters because of how concentrated Nscale's customer base is. According to its IPO filing, as reported by Bloomberg, Microsoft and Anthropic account for about 85 percent of Nscale's contracts. Anthropic agreed in August to spend $45 billion on Nscale compute over six years, a figure that shows how much of the company's future revenue is tied to a small set of frontier-lab and hyperscaler buyers. When one of those two anchors walks away from the flagship UK site, the concentration becomes the story of the IPO, not a side note.

The larger Microsoft relationship is not the one deal. The Times reported that Loughton makes up a small proportion of Nscale's roughly $103 billion in contracted revenues with Microsoft, which include projects in Portugal, the United States and Norway. Microsoft has also signed a letter of intent for a Nscale campus in West Virginia. So the exit is a re-rating of one anchor facility and one UK grid timeline, not a collapse of the overall Microsoft relationship, and Nscale's statement was at pains to separate the two.

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Still, the other flagship site is struggling too. Nscale's first data centre, in Norway, is about six months behind schedule, with 6.4 megawatts running of a planned 30 megawatts, according to Bloomberg. The company had previously reported the setback alongside earlier plans for the listing, and it has raised $3.36 billion in convertible financing led by Third Point. Revenue was reported up 1,252 percent in one account of the listing plans.

Neocloud jitters and what is dated next

The public-market backdrop makes the timing less forgiving. Investors have been repricing the AI infrastructure lenders and builders over the past week on concern that heavy borrowing to fund the buildout may not be repaid, and CoreWeave shares fell 25 percent last week, their worst week since November, according to reporting by The Next Web. Firmus, an Australian neocloud, scrapped its own IPO after failing to win enough support. A listing that leans on anchor contracts, credit availability and grid access is presenting exactly the mixture of risks in play across the sector.

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For Nscale, the near-term markers are the power answer at Loughton and the pace at Norway. The company says it is exploring alternative power sources for the site, and how that plays out will determine whether the anchor gap at its first UK facility is temporary or structural. The next catalysts are the results of that power hunt, any update to the IPO timetable, and the broader tape for AI infrastructure financing. For the sector, the Loughton exit is a reminder that the constraint is not chip supply and not committed capital. It is the grid, and it is showing up in the middle of deals rather than at the edges.

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