European AI cloud company Nebius has signed on to lease 22MW of capacity from Kao Data’s Harlow data center campus in the UK.

The company has also pledged a £1.7 billion ($2.26bn) investment in the UK, through which it will establish three new Nvidia infrastructure deployments.

The three new sites build on Nebius’ existing Nvidia Blackwell Ultra deployment in London, which was launched in November 2025.

Nebius’ agreement with Kao Data will span ten years and see the company hosting its Nebius AI Cloud platform and managed inference service, the Nebius Token Factory, from the data center campus.

Speaking on the announcement, Spencer Lamb, CEO, Kao Data, said: “Today marks a significant milestone in the evolution of the Kao Data portfolio and a landmark moment in the UK’s AI ambitions. Nebius is an impressive global AI cloud operator, and we are delighted to welcome such a significant deployment into our Harlow data center campus. This partnership proves that despite challenging macroeconomic circumstances, demand for industrial-scale, UK-based, cutting-edge AI remains high, with Kao Data the perfect platform for the latest AI workloads.”

“We’re pleased to be continuing our expansion in the UK with Kao Data,” said Andrey Korolenko, chief product and infrastructure officer at Nebius. “The UK is a major destination for AI and is becoming an important part of Nebius’s global footprint. By bringing dedicated capacity to support inference workloads, we can enable UK AI builders and enterprises to achieve their AI goals.”

Kao’s Harlow campus launched in 2018. The site was originally set to host four 10MW buildings, and has two operational data centers – KLON-01 and 02 – each offering 10MW. Work began on the site’s second data center in March 2022 and was completed in late 2023. Nvidia’s Cambridge-1 supercomputer sits within Kao’s original Harlow facility. In March 2025, it announced KLON-03, a new 17.6MW facility at the campus, and in September 2025 revealed plans for a further two data centers, bringing its total to five buildings.

Nebius hasn’t detailed the locations of the other two AI infrastructure deployments planned under its £1.7bn investment plan, but noted that combined, the three deployments will total 65MW of capacity when fully ramped up in 2027.

UK AI Minister Kanishka Narayan said: “We’re determined to make the UK the best place in the world to build and deploy AI – backing the infrastructure businesses, researchers and public services need to put this technology to work.

“Nebius’s investment brings significant AI compute into the UK, giving companies what they need to train, test, and run advanced systems here at home – helping drive productivity by rolling AI out widely across the economy.”

Nebius has a data center presence across the US, the Middle East, and Europe. As well as owning a data center in Mäntsälä, Finland, the company is currently leasing or set to lease capacity in the UK (London, in an Ark DC facility), France (Paris, Equinix), Israel (multiple locations, Mega Or), Iceland (Keflavik, Verne), Finland (Lappeenranta, Polarnode), and the US in New Jersey (Vineland, DataOne) and Missouri (Kansas City, Patmos).

The company is also planning a self-build outside Kansas City in Independence, Missouri, and planning a gigawatt-scale development in Pennsylvania. Nebius is also developing a 240MW data center in Béthune in northern France.