Yondr Group, a London-based private company that develops, owns, and operates hyperscale data centers for major global technology firms, has achieved the ready-for-service (RFS) milestone for the third data center on its 100MW London campus in Slough. This is a 40MW facility for which construction commenced in early 2025. The company had previously announced the RFS of a separate 30MW data center on the same campus in April 2025.
According to a company press release, the Slough campus is Yondr’s largest in the UK and forms part of the company’s ongoing expansion across Europe and North America. The data center was developed to Building Research Establishment Environmental Assessment Method (BREEAM) “Very Good” standards and incorporates several sustainability measures, including solar panels, a green wall along the canal-side perimeter, and biodiversity-focused landscaping featuring insect hotels and native pollinator planting. The project also incorporates low power usage effectiveness (PUE) targets.
Christopher Bennett, Project Director, said, “Our London campus holds significant strategic importance for Yondr and plays a vital role in supporting our growth objectives in Europe. We are proud to reach this important milestone for our third data center on this campus, which has been delivered in line with our sustainability strategy and 2030 target for Scope 1 and 2 carbon emissions.”
John Madden, Chief Data Center Officer, added, “Our 100MW London campus is part of our increasingly strong presence in Europe and, as we continue to build on capabilities in both Europe and North America, it demonstrates our ability to raise the bar in terms of both efficient project delivery and sustainability.”
Yondr Group currently has numerous facilities in North America tier 1 markets located Northern Virginia, Dallas and Toronto. Meanwhile, in EMEA the majority of the company’s data centers are in Frankfurt, London, Amsterdam and Berlin.
Slough Trading Estate is West London’s historic data center cluster, and still hosts nearly half of installed capacity in the London data center market according to Mordor Intelligence. Strong fiber connectivity to the City and major liquidity venues made it the original hub for colocation developments. However, grid-power constraints have stalled many large new connections, while land availability has become increasingly expensive.