Power Grid Crisis Forces Microsoft to Walk Away From Nscale's Flagship UK Data Centre, Threatening $35 Billion IPO
Power Grid Crisis Forces Microsoft to Walk Away From Nscale’s Flagship UK Data Centre, Threatening $35 Billion IPO #
Microsoft has terminated its agreement to serve as the anchor tenant at Nscale’s planned artificial intelligence data centre in Loughton, Essex, after UK Power Networks told the British neocloud operator that sufficient grid electricity cannot be delivered to the site until the early-to-mid 2030s. The withdrawal, first reported by The Daily Telegraph on 18 October and subsequently confirmed by Reuters, strips Nscale of its most prominent customer at the project just weeks before the startup is expected to seek as much as $3 billion in a New York Stock Exchange listing at a reported valuation of up to $35 billion.
The Loughton campus had been designed to deliver 50 megawatts of AI compute capacity for Microsoft Azure, with the potential to scale to 90 MW. Under the original agreement, Microsoft was to begin renting 23,040 Nvidia GB300 GPUs from the first quarter of 2027. That timetable has collapsed after grid authorities said the connection problem cannot be resolved for the better part of a decade.
In a statement, a Microsoft spokesperson confirmed the decision was limited to the single Loughton site and said the company remains committed to AI infrastructure investment in the United Kingdom. Microsoft also maintains a broader relationship with Nscale: the two companies struck a deal last year for Nscale to supply approximately 200,000 Nvidia GB300 GPUs to Microsoft across four countries on two continents. According to Nscale’s IPO filing, Microsoft has signed statements of work worth up to $43.8 billion through December 2033, though the filing does not specify how much of that figure was tied to Loughton specifically.
Nscale said in response that its relationship with Microsoft remains “strong and long-term” and that it is committed to the Loughton project. The company said it is actively exploring alternative power sources and additional UK sites to compensate for the grid shortfall. Microsoft and Anthropic together account for roughly 85% of Nscale’s total contracted revenue, making the loss of the anchor tenant at its flagship domestic site a difficult development to absorb ahead of a public listing.
The episode points to a gap between Britain’s ambitions to become a leading AI compute hub and the capacity of its electricity network to support large-scale data centre development. The government has made AI infrastructure a central part of its industrial strategy, but planning approvals and grid upgrade timelines have not kept pace with the rate at which hyperscalers and their cloud partners need power. For Nscale, the Loughton setback shows that securing customer commitments and Nvidia hardware is not enough on its own. Grid access determines whether a site can operate at all.
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