Jun 09, 2026 | Posted by Abdul-Rahman Oladimeji
UK data center firm Ark is expanding its Longcross Park campus in Surrey to support AI cloud provider Nebius. The company has committed £807 million ($1bn) to the site, where Nebius will lease the entire existing facility. Expansion plans include vertical upgrades to current buildings, a new 36MW data center (LP02), and broader infrastructure improvements. Ark has already invested £335 million ($449m), with a further £472 million ($632m) pledged.
Ark Data Centres CEO Huw Owen said demand for AI infrastructure is already live and growing, highlighting customer expansion at Longcross as validation of the site’s development. Nebius launched its London cluster at Longcross Park last year, initially leasing 16MW across 126 racks. The deployment includes thousands of Nvidia HGX B300 GPUs, with a second phase planned to expand capacity further. Ark was confirmed as the site host following the June 2025 announcement.
Ark’s Longcross expansion will support higher-density AI workloads at the 54MW, two-building campus in Chertsey’s Garden Village, which launched around 2024. Nebius said the expanded partnership will help it scale AI infrastructure in the UK. Ark operates 27 data centers across the UK and Belgium, totaling over 560MW, and is backed by Elliott Investment Management, with Revcap as a minority investor.
UK AI Minister Kanishka Narayan said Ark’s Longcross investment will help attract AI infrastructure, create jobs, and boost productivity.Nebius, spun out from Yandex, is investing £1.7 billion in the UK to deploy Nvidia infrastructure across three sites, including Ark’s Longcross expansion and a 22MW deployment at Kao’s Harlow campus. The projects are expected to reach 65MW of capacity by 2027. 
