Article 297: Microsoft Walks Away From Britain's Flagship AI Datacentre - Because the Grid Can't Power It Until the 2030s

Microsoft has cancelled its agreement to lease capacity at Nscale's Loughton site in Essex, the project the UK government promoted in 2025 as the country's "largest sovereign AI datacentre." UK Power Networks told Nscale it would not be able to supply enough power to the site until the early to mid-2030s. Microsoft was Nscale's only publicly announced customer there; it remains involved in a separate Nscale project in Norway. Nscale says it is "committed to the project," is exploring onsite generation and faster grid connections, and describes the problem as a "London-wide grid issue." The loss of the anchor tenant lands ahead of a planned Wall Street float the Guardian reports could value the Nvidia-backed company at $35 billion.

Key Takeaway: The announcement was a press release; the constraint was a connection queue, and the queue wins. This is the second time the same site has failed a basic reality check - the Guardian found in March that the location was still an operating scaffolding yard - and both failures share a shape: the thing that was promised publicly was not the thing that had to be built. What makes it a market story rather than a local planning story is the structure underneath. Nscale is a neocloud with a deep Nvidia relationship, a $35 billion float ambition and debt obligations that assume delivery dates; a customer cancelling on an anchor site weakens the case for all three. The UK government's AI strategy leaned on exactly two Nvidia-backed companies for its compute base, and one of them has just lost the flagship it was selling. Electricity is now the binding constraint on AI expansion in the places that want it most, and no amount of capital compresses a substation upgrade.

Sources: The Guardian, BBC, Financial Times, 18 October 2026