Discover datacenters / United Kingdom
NTT Hemel Hempstead 4 Data Center (HH4)
NTT DATA, Inc. · Hemel Hempstead · London Metro · United Kingdom
- Design resilience tier
- III
- Redundancy (as published)
- Dual dedicated 11,000V (HV) grid connections (2N) · Dedicated N+1 redundant HV substations on-site · Minimum N+1 (UPS) with battery backup · Backup generators · Compressor-less data suite cooling system with a minimum of N+1 redundancy · Concurrently maintainable AHUs · DX cooling to comms rooms (N+1 unites per room) · Direct air cooling to PODs (N+1 fans per section) · Service level agreement: 99.999% power uptime availability (fact sheet 2024). We provide you with the best possible physical and technical infrastructure supported by N+1 UPS systems, N+1 generator backup, as well as N+1 cooling systems. (site brochure 2024)
- Floor area
- 4,800 m² whitespace
- Security
- 24/7 on-site security
- Year built
- 2021
- Rack density
- 20 kW
Platform reviewed · 05 Sept 2026 · Recent
- Density (as published)
- Contained hot aisle or chimney rack design for high efficiency cooling up to 20kW per rack (fact sheet 2024)
- Power band
- 5–20 MW
Imported · Recorded 08 Jun 2026 · Recent
- Cooling
- Air cooling, Free cooling
- Availability
- Availability on request
Imported · Recorded 08 Jun 2026 · Not recent
- Cross-connect
- On request
- Renewable power
- 100% renewable power
- Services
- Colocation, connectivity, high-density and wholesale
- Certifications 10
- ISO 9001ISO 27001ISO 22301ISO 50001ISO 45001ISO 14001PCI DSSISAE 3402ISAE 3000SOC 2
Location
View on the full map · Elevation 135 m above sea level
Interested in this location? Send one inquiry with your requirements and receive a response within one business day.
Data sources
This profile is based on public sources; the operator has not yet confirmed its data. Confirmed data carries the Verified badge and a confirmation date.
Do you manage this datacenter? Claim your listing at no cost and keep the data current yourself.