Iron Mountain LON-2 London Slough: 27MW Hyperscale Data Center
Status: Operational / Fully Commissioned Wholesale Facility | Location: 110 Buckingham Avenue, Slough Trading Estate, Slough SL1 4PF, United Kingdom
Project Overview
Iron Mountain’s LON-2 is a flagship 27 MW, three-story greenfield data center strategically located on Buckingham Avenue within the renowned Slough Trading Estate, Europe’s leading data center and connectivity hub. Purpose-built to accommodate large-scale wholesale hyperscale deployments and high-density enterprise workloads, the facility delivers approximately 9 MW of customer IT capacity per floor, offering exceptional scalability for cloud providers, AI infrastructure, financial institutions, and global enterprises. As a key component of Iron Mountain’s interconnected London campus alongside LON-1 and LON-3, LON-2 enables customers to expand seamlessly while benefiting from a resilient, carrier-neutral ecosystem. The facility provides ultra-low-latency connectivity to the London Internet Exchange (LINX), direct access to more than 15 on-site Network Service Providers (NSPs), and dual diverse dark-fiber cross-connects to over 200 network operators, cloud providers, and internet exchanges, ensuring high availability and reliable performance for mission-critical applications. Designed with modern power and cooling infrastructure, LON-2 supports high-density computing environments required for artificial intelligence, machine learning, and high-performance computing (HPC) workloads while maintaining operational efficiency and reliability. Sustainability is central to the facility’s operations, with electricity matched by 100% renewable energy, helping customers reduce their environmental impact and meet corporate sustainability goals. Backed by Iron Mountain’s industry-leading physical security, operational expertise, and resilient infrastructure, LON-2 provides a future-ready colocation platform for organisations seeking secure, scalable, and highly connected digital infrastructure in one of Europe’s most important data center markets.
Quick Facts
| Field | Value |
|---|
| Project Name | Iron Mountain LON-2 London Slough: 27MW Hyperscale Data Center |
| Location | 110 Buckingham Avenue, Slough Trading Estate, Slough SL1 4PF, United Kingdom |
| Status | Operational / Fully Commissioned Wholesale Facility |
| Commissioning | Phase 1 Go-Live: Late 2023 / Full Facility Operations: 2024 |
| Total IT Load | 27 MW Critical IT Load (9 MW per floor across 3 floors) |
| Total Capacity | ~32+ MW Total Utility Substation Capacity across 269,097 sq ft (25,000 m²) gross floor area |
| Tier Level | Tier III Equivalent / Concurrent Maintainability (ISO 9001, ISO 14001, ISO 22301, ISO 27001, ISO 50001, BREEAM, PCI-DSS, SOC 2 Type II Certified) |
| Project Type | Purpose-Built Greenfield Wholesale Hyperscale & Enterprise Data Center |
City Profile
| Header | Details |
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| 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 |
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| Developer / Operator | Iron Mountain |
| Strategic Infrastructure Partner | SEGRO (Slough Trading Estate Landowner), Scottish and Southern Electricity Networks (SSEN Utility) |
| Construction Contractor | Specialized UK & European Mission-Critical EPC & Data Center Contractors |
| MEP Engineering | Iron Mountain Global Design & High-Density Thermal Engineering Teams |
| Network Connectivity | Dual diverse underground fiber entry vaults; direct carrier-neutral access to 15+ NSPs, LINX (London Internet Exchange) peering, dark-fiber campus links to LON-1 and LON-3, and direct low-latency cloud on-ramps. |
| Power Infrastructure | Dual high-voltage grid connections supplied by SSEN, 2N / N+2 block-redundant uninterruptible power supply (UPS) architecture, and standby emergency diesel backup generators with 48+ hours on-site fuel autonomy. |
Technical Specifications
| Header | Details |
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| Power Capacity | 27 MW Critical IT Power Capacity / 32+ MW Utility Substation Feed |
| UPS Redundancy | 2N / N+2 Static UPS Topology |
| Cooling System | High-efficiency air-cooled chilled water system with N+2 cooling plant redundancy, hot/cold aisle containment, free-cooling economization, and liquid-to-chip (DLC) cooling readiness for high-density compute nodes. |
| Connectivity | Carrier-neutral platform with multi-path fiber entry points, dual Meet-Me-Rooms (MMRs), and global cloud orchestration via Green Power Pass & ServiceFabric™. |
| PUE Target | < 1.25 Annualized Operational Design PUE |
| Energy Mix | 100% matched clean renewable energy (wind and solar) backed by REGO certificates and Iron Mountain Green Power Pass accreditation. |
Milestones
| Header | Details |
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| Announcement | Q2 2021 |
| Construction Start | 2022 |
| Phase 1 Go-Live | Q4 2023 |
| Full Buildout | Operational |
Investment Details
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| Total Investment | Estimated £150,000,000 GBP to £200,000,000 GBP |
| Funding | Iron Mountain Inc. corporate capital expenditure (CapEx) allocation |