Yondr Group (data center developer) has achieved its first ready-for-service (RFS) milestone for the third data center on its 100-megawatt London campus in Slough, marking another significant step in the hyperscale developer's expansion across Europe.

A Campus Reaching Full Capacity

The newly completed facility is a 40-megawatt asset, and its RFS milestone arrives only 15 months after Yondr broke ground on the project in early 2025. That pace of delivery follows a pattern the company established just a year earlier, when it announced the ready-for-service status of its 30-megawatt second data center on the same campus last April.

Together, the three facilities make up Yondr's 100-megawatt London campus, which the company describes as the largest data center campus in Slough.

John Madden, Chief Data Center Officer at Yondr, said the campus represents a cornerstone of the company's European presence. "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," Madden said.

Sustainability Designed Into the Build

The third data center has been designed to BREEAM (Building Research Establishment Environmental Assessment Method) Very Good standards, with sustainability cited as a priority alongside capacity and reliability.

The facility incorporates solar panels and what Yondr describes as industry-leading power utilization efficiency ratings as part of its broader sustainability strategy.

The project is also aligned with Yondr's stated 2030 target for Scope 1 and 2 carbon emissions. Christopher Bennett, Project Director at Yondr, noted that the milestone reflects both the technical ambitions of the project and the company's sustainability commitments.

"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," Bennett said. "This achievement would not have been possible without the strong collaboration and commitment of our valued vendors and partners."

One distinctive architectural feature of the new facility is a green wall installed along the canal side perimeter of the campus. The structure serves a dual function, providing both visual and acoustic shielding for the boundary of the site. Landscaping across the campus has been designed with biodiversity in mind, with insect hotels and native, pollinator-focused planting already in place.

Community Engagement Alongside Construction

As part of its development process, Yondr carried out a community needs assessment in line with the company's sustainability strategy. That assessment identified an opportunity to support outdoor learning for young children, leading the company to work with local schools and the Iver Environment Centre.

The community engagement component also extended into education and skills development. Yondr recently launched a scholarship program in the Slough area, providing 27,000 pounds for a local student to attend university to study a digital infrastructure-aligned STEM course. The company framed both initiatives as extensions of its broader commitment to the communities surrounding its campuses.

European and North American Growth Trajectory

The Slough campus achievement fits into a wider pattern of expansion that Yondr has described across both Europe and North America. The company positions itself as a developer, owner, and operator of hyperscale data centers, and the successive RFS milestones at the London campus have come at a rapid pace.

The groundbreaking for the first phase of the three-building campus, the delivery of the second data center in April 2025, and now the partial readiness of the third facility all point to a compressed construction and delivery timeline that the company has highlighted as a competitive differentiator.

Madden's comments underlined that the London campus is not being treated as a standalone project but rather as evidence of a broader capability the company intends to replicate across its portfolio.

Planning approval for the third data center at the London campus was secured in August 2024, meaning the project moved from approved planning to first RFS in under two years.

The campus also served as a showcase for Yondr's international profile. In September 2025, the company welcomed an international delegation to the 100-megawatt site, an event that reflected the growing attention being paid to the UK's data center project infrastructure by global operators and investors.

With the first RFS now confirmed for the third facility, Yondr has not specified a timeline for full capacity delivery across the entire 40-megawatt building, but the milestone marks the beginning of operational status for what represents the largest single asset on the campus to date.

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