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Microsoft has ended its anchor-tenant agreement for Nscale's planned AI data center in Loughton, Essex, after the local grid operator said full power would not arrive until the early to mid-2030s. The cancellation, reported on October 18, 2026, by cryptobriefing.com, scuppers what was pitched as the UK's largest sovereign AI data center, initially planned for 50 MW expandable to 90 MW and 23,040 Nvidia GB300 GPUs dedicated to Microsoft Azure. The site was meant to open in late 2026 or early 2027. The news lands as Nscale, which filed for a US IPO in September 2026 targeting a valuation of up to $35 billion, also faces delays at its flagship Norway site, where only 6.4 MW of planned 30 MW capacity is operational.

Background

The Loughton project was closely tied to the UK government's goal of positioning the country as a leader in AI, ambitions showcased during high-profile US-UK tech diplomacy events in 2025, according to cryptobriefing.com. The UK grid has a well-documented connection backlog, with some projects reportedly facing delays of up to 13 years waiting to be hooked up. Microsoft has been careful to frame the Loughton decision as a site problem rather than a partner problem, saying its wider partnership with Nscale remains strong and that other contracts covering projects in Norway, Portugal, and the United States are not affected. Nscale is not abandoning Essex; it is exploring on-site generation options, including fuel cells, to power the Loughton facility, and says it is still pursuing expansion opportunities elsewhere in the UK. The less reassuring part involves Norway, where Nscale's flagship site is also running behind, with only 6.4 MW of its planned 30 MW capacity currently operational. Nscale filed for a US IPO in September 2026, targeting a valuation of up to $35 billion, a valuation that leans primarily on its contracts with Microsoft and Anthropic. Losing Microsoft as anchor tenant at one site, a month after filing to go public, is awkward timing.

What happened

According to cryptobriefing.com, Microsoft pulled out of a planned artificial intelligence data center in the United Kingdom, not because of a chip shortage, a funding gap, or a change in strategy, but because the building simply couldn't get enough electricity. The facility, developed by AI infrastructure company Nscale in Loughton, Essex, was supposed to supply computing power to Microsoft's Azure cloud business. Microsoft ended its anchor-tenant agreement for the site on October 18, 2026. The trigger was UK Power Networks telling the project that adequate grid power would not reach the site until the early to mid-2030s. The data center was meant to open in late 2026 or early 2027. On paper, Loughton was a serious project: it was pitched as the UK's largest sovereign AI data center, meaning computing capacity located and controlled within the country's borders. The plan called for an initial capacity of 50 MW, with room to expand to 90 MW. Those servers were to include 23,040 Nvidia GB300 GPUs, all dedicated to Microsoft Azure workloads. Microsoft says the broader relationship is fine: the company said its wider partnership with Nscale remains strong, and its other contracts with Nscale, covering projects in Norway, Portugal, and the United States, are not affected by the Loughton decision. The less reassuring part involves Norway: Nscale's flagship site there is also running behind, with only 6.4 MW of its planned 30 MW capacity currently operational. Nscale, for its part, is not abandoning Essex. The company is exploring on-site generation options, including fuel cells, to power the Loughton facility. It also says it is still pursuing expansion opportunities elsewhere in the UK.

Market impact

The sources provide limited market figures. Nscale filed for a US IPO in September 2026, targeting a valuation of up to $35 billion, according to cryptobriefing.com. That valuation leans primarily on its contracts with Microsoft and Anthropic. Losing Microsoft as anchor tenant at one site, a month after filing to go public, is awkward timing, the report states. Microsoft's statement that other contracts remain intact helps, but the Norway shortfall raises questions about how many other sites face similar power constraints. A company valued on future capacity needs to show it can actually bring that capacity online. The Loughton project itself was planned for an initial capacity of 50 MW, with room to expand to 90 MW, and 23,040 Nvidia GB300 GPUs dedicated to Microsoft Azure workloads. In Norway, only 6.4 MW of the planned 30 MW capacity is currently operational. The UK grid has a well-documented connection backlog, with some projects reportedly facing delays of up to 13 years waiting to be hooked up. No price reactions, trading flows, or emissions figures are provided in the source text.

Why it matters

The cancellation matters because it shows that power availability, not chips or funding, can determine whether AI infrastructure gets built. For Nscale, the timing is awkward: it filed for a US IPO in September 2026 targeting a valuation of up to $35 billion, a valuation that leans primarily on its contracts with Microsoft and Anthropic, and losing Microsoft as anchor tenant at one site a month later raises questions. Microsoft's statement that other contracts remain intact helps, but the Norway shortfall, where only 6.4 MW of planned 30 MW is operational, raises questions about how many other sites face similar power constraints. A company valued on future capacity needs to show it can actually bring that capacity online. For the UK, the Loughton cancellation lands on a sore spot for British policymakers, as the project was closely tied to the government's goal of positioning the UK as a leader in AI. The UK grid has a well-documented connection backlog, with some projects reportedly facing delays of up to 13 years. Nscale's exploration of on-site generation, including fuel cells, suggests the company is trying to work around grid constraints, but the source does not say whether that will be enough.