Microsoft's UK Exit Exposes Nscale's Real Weakness: Two Customers, 85% of Contracts

Microsoft has withdrawn from a planned UK data centre agreement with AI infrastructure provider Nscale, according to the Telegraph. The deal concerned Nscale's proposed site in Loughton, Essex, where Microsoft was expected to be anchor tenant. The Telegraph did not establish a specific reason for the withdrawal.

The project had faced delays and difficulty securing electricity supplies. Authorities reportedly told Nscale the facility might not get a grid connection until the 2030s. That timeline, not chip supply or capital, is the constraint that matters here. A site that cannot draw power until the next decade is not a site Microsoft can plan around.

The withdrawal is not the only schedule problem. Nscale's flagship Norway data centre is roughly six months behind, with 6.4 MW of its planned 30 MW capacity operational. That is about 21% of intended capacity running.

Then there is the number that may prove more revealing than the Essex pullout. Nscale is preparing for a potential IPO that could raise as much as $3 billion as early as October. Its filing shows Microsoft and Anthropic account for approximately 85% of its contracts. Losing an anchor tenant ahead of a listing sharpens the risk of a contract book concentrated in two customers.

The picture is not one of collapse. Nscale has announced a continuing Microsoft collaboration at Start Campus' SINES site in Portugal, delivering 66,000+ NVIDIA Rubin GPUs from late 2027, building on 12,600+ Blackwell Ultra GPUs, alongside deployments for Microsoft in Norway, the UK and the US. The UK withdrawal does not cancel those arrangements.

What it does is reframe where the risk sits. For the UK, the episode shows that electricity timelines can decide which AI projects proceed, regardless of stated ambitions. For Nscale, it shows that a concentrated customer base is a valuation question, not just a footnote. For anyone watching the AI infrastructure trade, grid and power enablers look less like supporting players and more like gatekeepers.

Why Microsoft withdrew — grid timing, cost, strategy or something else — is not established. Whether Nscale can replace Microsoft at Loughton, and on what timeline, is unknown. Those questions will shape both the IPO and the UK's buildout plans.