Nebius to Launch UK’s First NVIDIA Blackwell AI Cluster at Ark’s Longcross Campus

Nebius will deploy 4,000 NVIDIA Blackwell Ultra GPUs at Ark’s Longcross Park in Surrey, marking the UK’s first major Blackwell AI cluster and a key step in national AI infrastructure growth.

European AI cloud company Nebius has announced plans to host the UK’s first large-scale deployment of NVIDIA Blackwell Ultra GPUs at Ark Data Centres’ Longcross Park campus in Surrey, marking a significant expansion of its global footprint and reinforcing the UK’s ambitions to establish itself as a leader in AI infrastructure.

Liquid-Cooled Infrastructure to Power AI Compute

Together, Ark and Nebius will install 4,000 NVIDIA Blackwell Ultra B300 GPUs at the Longcross Park site in Chertsey. The deployment will be housed in a state-of-the-art, liquid-cooled data hall designed specifically for the high power and thermal requirements of next-generation AI workloads. 

The site, which totals 54MW across two data centres, will feature on-site power generation and high-density cooling systems to support sustained AI compute operations.

The cluster is expected to go live by Q4 2025 and forms part of a broader investment strategy by Ark. The Longcross installation also marks Nebius’s first venture into the UK market.

“AI clouds need sites that can deliver high-density cooling today and scale rapidly tomorrow,” said Huw Owen, CEO, Ark Data Centres. “Longcross Park was engineered precisely for that challenge, and we are delighted to welcome Nebius to the UK as a key AI tenant.”

“This agreement shows that the UK already has the infrastructure to support global innovators,” he added, “and it underlines our commitment to invest £7.5 billion ($10.2 billion) in new, AI-ready capacity across the country to underpin the UK’s AI future.”

The full project will eventually scale to host around 9,000 Blackwell Ultra GPUs, making it one of the largest GPU deployments in the country and the first installation of Nvidia’s powerful new chips outside of the United States. The Blackwell Ultra GPUs—designed to handle complex generative AI, LLMs, and advanced inference tasks—are expected to provide the computational backbone for a range of UK-based startups, enterprises, research bodies, and public sector organisations, including the NHS.

Nebius Expands Global AI Footprint

For Nebius, the move aligns with its aggressive global expansion strategy. Formed in 2024 after the spin-off of Yandex’s European operations, Nebius is headquartered in Amsterdam and operates live clusters in Finland, France, and the US, with additional developments underway in Israel, Iceland, and Missouri. The company aims to operate seven clusters across six countries by the end of this year.

Andrey Korolenko, Chief Product and Infrastructure Officer at Nebius, emphasised the strategic value of the partnership, saying, “Partnering with Ark gives us access to an environment built for the next wave of GPU innovation, with the right infrastructure that is needed to support today’s highly intensive AI cloud workloads.”

“By locating compute resources close to the UK’s world-class startups, enterprises, researchers, and public-sector innovators,” he continued, “we will enable them to move faster from idea to implementation.”