Microsoft, one of Nscale's two largest customers, terminated its agreement for a planned site in Loughton, Essex, after grid officials told the British AI cloud provider not to expect power there for years. Nscale, which filed for a U.S. listing last month, says its other contracts are unaffected.
The AI infrastructure boom has a constraint that money alone cannot fix, and it has just cost a pre-IPO company its marquee customer at one site.
Microsoft has terminated its agreement for a data center in Loughton, Essex, that was being developed by Nscale, the British AI cloud provider, The Telegraph reported on Sunday. Microsoft is one of Nscale's two largest customers. Grid officials told Nscale they did not expect to provide power to the site until the 2030s.
"Our relationship with Microsoft remains strong and long-term, and this unfortunate London-wide grid issue has no impact on our other contracts," Nscale said. Nscale said it remains committed to both the Loughton project and the U.K. and is exploring alternative power sources. Microsoft declined to comment and has not given a reason for the termination.
Why it matters for the listing
Nscale filed last month for an initial public offering in the U.S., and its prospectus names Microsoft among its expected major customers. For a company preparing to sell shares, losing a project with one of its largest customers is a material change, even if the rest of the relationship is intact. Microsoft and Nscale still work together on projects in Norway, Portugal and the U.S.
The value of the Loughton agreement has not been disclosed. Nscale said last year that the site would provide 50 megawatts, scalable to 90, and about 23,000 Nvidia GB300 chips to run Microsoft's Azure services from early 2027. Investors will look for an amended prospectus to show what share of its contracted pipeline that represented.
Power, not demand
The reason given matters more than the loss. Nscale and the grid officials point to power availability, not to any change in Microsoft's appetite for AI capacity. That distinction cuts both ways for investors.
On one hand, it suggests demand is not the problem. Microsoft has not said it needs less capacity, only that this site cannot deliver it on a useful timeline. On the other hand, it highlights a risk that applies across the sector: a contract with a large customer is only as good as the developer's ability to get the site powered on time. Customers with options can walk away and build elsewhere.
The same problem is visible in the U.S. Oracle's Project Jupiter in New Mexico has buildings near completion but no power, its permit hearing has slipped to December, and its debt has traded at a steep discount.
Microsoft shares fell 1.9% to $529.05 on Friday, before the report. Shares of listed AI cloud providers CoreWeave and Nebius fell about 12% each on Friday amid a broader selloff.
Market implications
One reading is that this is a site-specific setback. Nscale describes the problem as a London-wide grid issue, says its other contracts are unaffected, and Microsoft's relationship with the company continues. On that view, Nscale loses Microsoft at one site, not Microsoft as a customer.
A second reading is that it exposes the central risk for AI infrastructure developers heading to public markets. If a top customer can terminate when a site's power slips, contracted backlog is less firm than it looks, and investors pricing these companies on signed deals need to discount for power risk.
What to watch
An amended Nscale prospectus disclosing the effect of the termination; any Microsoft statement on its U.K. capacity plans; whether Microsoft shifts the capacity to another Nscale site; and the timing of Nscale's offering. A disclosed replacement site with Microsoft would support the site-specific reading.