• Hemel Hempstead 4 Data Center

Hemel Hempstead 4 Data Center

With a total of 9,600 m² of IT space and a maximum of 24 MW IT load, Hemel Hempstead 4 Data Center will offer complete solutions for housing your IT and network systems in a secure, high availability environment. We will 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. Hemel Hempstead 4 Data Center will hold multiple certifications and will be connected to major carrier hubs in the Docklands and Slough. It will be a fiber connected campus and fully integrated with other NTT data center facilities, allowing clients to continue growing.

Hemel Hempstead 4 overview

  • 9,600 m² of IT space
  • 24 MW of critical IT load
  • Powered shell and build to suit
  • Remote Hands
  • Multi Service Interconnection Platform
  • Cross Connects

Take a look inside the future Hemel Hempstead 4

Main entrance

  • Registration and visitor verification desk
  • In-house security staff to secure the site 24x7x365


  • Offices, storage space and pre-installation rooms
  • Common areas such as meeting rooms and kitchen

IT space

  • Powered shell and build to suit
  • 24/7 Remote Hands services

Hemel Hempstead 4 specifications


  • On-site substation delivering 60 MVA of power
  • Maximum client IT load of 24 MW
  • Dual dedicated 11,000V (HV) grid connections (2N)
  • Dedicated N+1 redundant HV substations on-site
  • Minimum N+1 (UPS) with battery back-up
  • Back-up generators


  • 24/7 on-site security
  • 3.6 m SEAP certified security fence with electrified topper
  • External and internal IP CCTV system
  • Proximity cards to authorize access levels including man trap access
  • Biometric identification


  • Carrier-neutral
  • Carrier mix from global tier 1 supplier to regional supplier
  • Connectivity and dark fiber infrastructure in place connecting to the other London area NTT data centers and the major carrier hubs in the Docklands
  • Multi Service Interconnection Platform to connect our clients to major cloud service providers
  • Redundant Carrier-Meet-Me-Rooms 


  • Primary cooling infrastructure, centrally managed and linked to BMS
  • Room air conditioning units
  • Regulated humidity
  • 1.5 m clear false ceiling void for hot-air return to Air Handling Units (AHU)
  • Contained hot aisle or chimney rack design for high efficiency cooling up to 20 kW per rack

At a glance

At a glance

Experience in the UK

Hemel Hempstead 4 will join six other NTT data centers operating in the London area with locations in Hemel Hempstead, Slough and Dagenham. We have been in the UK market for over 20 years, originally operating as Gyron before being acquired by NTT and becoming part of the Global Data Centers division of NTT Ltd. in 2019.

Serving the London area

Our Hemel Hempstead 4 Data Center will be located 24 miles northwest of London and will be part of the Greater London Urban Area. The area has attracted many businesses due to its proximity to London and excellent connectivity links, with easy access to the UK motorway network and London airports. As well as being connected to other NTT data centers in the future, the facility will also be connected to major carrier hubs in both Slough and the Docklands. 

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