Yondr London Slough Building 3: 40MW Hyperscale Data Center
Status: Operational / Ready for Service (Achieved May 7, 2026) | Location: Slough SL2 5EJ, United Kingdom
Project Overview
Formally hitting its Ready for Service (RFS) milestone on May 7, 2026, Yondr Group’s Building 3 development represents the final crown jewel of its 100MW Slough mega-campus. Constructed in a compressed 15-month timeline following its early 2025 groundbreaking, this 40MW facility solidifies Slough Trading Estate's position as West London's premier, high-density mission-critical data corridor. Designed explicitly to accommodate intense cloud workflows and enterprise AI deployments, the multi-facility development breathes commercial life back into a formerly derelict industrial paint factory site. To soften the physical presence of the facility along the public canal-side perimeter, Yondr constructed a specialized, independent green wall structure that provides acoustic dampening and visual shielding. Alongside the heavy civil infrastructure work, Yondr executed community-aligned education programs, funding biodiversity-focused outdoor learning for local schools and establishing a £27,000 regional STEM scholarship program to train local tech talent.
Quick Facts
| Field | Value |
|---|
| Project Name | Yondr London Slough Building 3: 40MW Hyperscale Data Center |
| Location | Slough SL2 5EJ, United Kingdom |
| Status | Operational / Ready for Service (Achieved May 7, 2026) |
| Commissioning | Phase 1 Live: July 2024; Building 2 Live: April 2025; Building 3 Live: May 2026 |
| Total IT Load | 40 MW (Building 3 Dedicated Load Footprint) |
| Total Capacity | 100 MW+ (Cumulative Three-Building Campus Capacity Threshold) |
| Tier Level | Tier III (Concurrently Maintainable Hyperscale Architecture) |
| Project Type | Purpose-Built Wholesale Hyperscale Colocation & Digital Infrastructure Hub |
City Profile
| Header | Details |
|---|
| City Name | london |
| Population | 8.9 Million |
| Urban Agglomeration | 9.8 to 11.4 million |
| City GDP | £110.8 billion in 2023 |
| Per Capita Income | £69,077 in 2023 |
| City Tier | Tier 1 |
| Key Strengths | Global Financial Hub; Dense Connectivity; Low Latency to Europe and North America; large skilled talent pool. |
Companies Involved
| Header | Details |
|---|
| Developer / Operator | Yondr Group |
| Strategic Infrastructure Partner | Confidential Tier-1 Global Hyperscale Technology Tenants |
| Construction Contractor | Principal UK Mission-Critical General Contracting Partners |
| MEP Engineering | JCA Engineering / Cundall |
| Network Connectivity | Ultra-Low Latency Fiber Rings linking directly to the City of London Liquidity Hubs |
| Power Infrastructure | Slough Trading Estate Power Grid / Local Substation Interconnects |
Technical Specifications
| Header | Details |
|---|
| Power Capacity | 100 MW+ Ultimate Combined Campus Substation Grid Allocation |
| UPS Redundancy | N+1 Distributed Static High-Efficiency UPS Arrays with Fast-Start Capability |
| Cooling System | Energy Efficient Chilled Water Loops with Integrated Rooftop Economizers |
| Connectivity | Carrier-Neutral Core; Multiple Diverse Entry Vaults facing Wexham Road/Canal |
| PUE Target | 1.21 (Optimized annual runtime targets under BREEAM frameworks) |
| Energy Mix | 100% Green Tariff Grid Power backed by On-Site Rooftop Solar PV Arrays |
Milestones
| Header | Details |
|---|
| Announcement | October 2021 |
| Construction Start | February 10, 2025 |
| Phase 1 Go-Live | May 7, 2026 (Building 3 Ready for Service) |
| Full Buildout | May 2026 (Complete 3-Building Campus Operational) |
Investment Details
| Header | Details |
|---|
| Total Investment | £532 Million Green ABS Bond Financing Secured for Asset Portfolio |
| Funding | Asset-Backed Securitized (ABS) Term Notes under Yondr’s Green Finance Framework |