Microsoft Pulls Out of a Deal to Rent 23,000 Nvidia Chips at a Delayed UK Data Centre, Imperiling Nscale Plan for a $35 Billion IPO

Microsoft has walked away from one of the flagship deals of Britain's AI infrastructure push. The Telegraph reported on Sunday that the company recently informed Nscale, the UK data centre developer it once anointed as a sovereign-capacity champion, that it is terminating the agreement announced last year under which Microsoft was to become the anchor tenant of Nscale's first British data centre in Loughton, Essex.

The deal was substantial by any measure: Microsoft had agreed to rent 23,000 Nvidia AI chips at the facility, and its backing formed part of the 22 billion pound investment pledge the company made in Britain during Donald Trump's state visit — a commitment Prime Minister Keir Starmer framed as a step toward Britain "becoming a world leader in AI." The site was originally supposed to come online next year, but it has slipped repeatedly. According to the report, grid operators have told Nscale they do not expect to deliver power until the 2030s. With Microsoft's exit, the site now sits in limbo.

For Nscale the timing is brutal. The company, which is backed by Nvidia and counts former Facebook executive Sheryl Sandberg and Sir Nick Clegg on its board, has been privately valued at $15 billion and is preparing a Wall Street flotation of up to $35 billion. It claims $103 billion in contracted revenue, more than 40 percent of it from Microsoft, with Anthropic as another major customer. The IPO was already shaping up as a litmus test of investor appetite for debt-hungry AI businesses; now it will also be a referendum on whether contracted backlog survives when an anchor tenant leaves.

The cancellation lands in the middle of a punishing week for the AI compute trade. Data centre developers saw their shares plunge on concern that rising interest rates and inflation will make it harder to service the debt behind the building boom. Gartner warned last week that up to $3.5 trillion of AI-related assets could face write-downs by 2030 if the expected returns fail to materialize. Earlier this month Australia's Firmus scrapped a planned $20 billion IPO citing market conditions, while the bonds and shares of neocloud operators such as CoreWeave and Nebius have sold off sharply.

Nscale struck a defiant tone in response. A spokesperson said the company remains "firmly committed" to the Loughton project and the UK, is seeking alternative power for the site, and is planning further expansion locations in Britain. The statement insisted the Microsoft relationship is "strong and long-term" and argued that the grid-wide problem in London will not affect its other contracts. Microsoft has not publicly detailed its reasons, but the project's inability to secure power this decade is the obvious constraint: a data centre built around tens of thousands of top-end chips is worthless until the electrons arrive.

The episode is a clean illustration of where the AI buildout now meets physics and politics at the same time. The financing logic of the data centre boom depends on hyperscalers signing long-term capacity commitments years before delivery; when a tenant of Microsoft's stature cancels because the grid cannot keep up, every other operator's backlog gets discounted by the market. For Britain, the lesson is blunter: an AI strategy built on ribbon-cuttings and investment pledges still needs substation capacity, and a 2030s power date is a different project than a 2026 launch.