Microsoft says it is building the UK’s largest supercomputer as part of a $15 billion investment in AI infrastructure in the country.

It will work with GPU-designer Nvidia to deliver the supercomputer at Nscale’s planned data center in Loughton, Essex.

Overall, Microsoft says it is investing $30 billion in its UK operations, and made the announcement to coincide with US President Donald Trump’s state visit to Britain this week.

The supercomputer will feature 23,000 Nvidia Grace Blackwell Ultra GPUs, according to Microsoft, though a separate announcement from Nvidia claims the machine will comprise “more than 24,000” of the AI chips. Either way, it’s likely to pack a fair bit of punch.

A launch date for the machine has not been disclosed, but Nscale has previously said it expects its Loughton data center to open in late 2026, and offer access to 46,000 Nvidia GPUs. The data center will have a planned 50MW of IT capacity, though the site has a power allocation of 90MW.

Microsoft will make the $15bn investment in UK infrastructure over the next three years, with the full sum spent by 2028.

“This investment is designed not only to meet customer demand, but to strengthen the economic ties that benefit both sides of the Atlantic,” said Microsoft president Brad Smith.

UK Prime Minister Keir Starmer said: “Microsoft’s landmark investment is a powerful vote of confidence in the UK’s leadership in AI and cutting-edge technology.

“This commitment will not only strengthen our digital infrastructure and support thousands of highly skilled jobs. We are proud to partner with world-leading companies like Microsoft to build a future powered by British ingenuity and ambition.”

Microsoft says it will also spend $15 billion bolstering its existing UK operations, though it is not clear if this is new funding or a restatement of existing investment plans.

The news comes after President Trump arrived in the UK on Tuesday evening, with the UK and US governments announcing a Tech Prosperity Deal between the two nations.

A string of data center-related investments have also been confirmed this week, including a £5bn ($6.9bn) Google deal, a $678m BlackRock venture, and a new Vantage facility, while CoreWeave says it is investing £1.5 billion ($2bn) in UK AI data center capacity and operations.