• Hemel Hempstead 1 Data Center

Hemel Hempstead 1 Data Center

Hemel Hempstead 1 provides clients with 2 MW of IT load within a 4,000 m² secure site with a single storey data center building. The data center offers highly available, scalable data center space, with options for high power density, carrier neutrality, access to public cloud providers, internet connectivity, and on-site support. The locality 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. 

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Hemel Hempstead 1 overview

  • 4,000 m² secure site campus
  • 2 MW of critical IT load
  • Fully-fitted colocation space and private suites
  • Multi Service Interconnection Platform
  • Cross Connects
  • 24/7 Remote Hands services

Take a look inside Hemel Hempstead 1

Main entrance

  • Reception 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, catering area and showers

IT space

  • Fully-fitted: Colocation Rack, Carrier Rrack, Dedicated Cage and Dedicated Suite
  • 24/7 Remote Hands services

Download the Hemel Hempstead 1 Data Center brochure

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Hemel Hempstead 1 specifications


  • Maximum client IT load of 2 MW
  • Single dedicated 11 kV (HV) grid connections via diverse underground feeders from primary substation
  • Two separate UPS systems (A- and B supply) with N+1 redundancy
  • Redundantly designed emergency power system with diesel generators N+1
  • On-site substation delivering 3 MVA of power
  • Average power density of ~2.0 kW/sqm


  • 24/7 Security Operations Center (SOC) and Service Control Center
  • Redundant monitoring of all critical functions underpinned by standardized security processes and the multilevel security zone principle, secures the rental area and the technical operation
  • 3 m security palisade fencing, topped with »Rota-Spikes«
  • CCTV covering the external perimeter, plant areas, and data halls
  • Card swipe entry/exit to all doors



  • Carrier-neutral
  • Carrier mix from global tier 1 supplier to regional supplier
  • Connectivity and dark fiber infrastructure in place connecting Hemel Hempstead 1 to other Hemel Hempstead data centers, London 1, Slough 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 


  • Redundant water-cooled system (N+1) 
  • Data halls utilize a free cooling system, designed for superior energy efficiency and performance
  • Cold air flooded room cooling design with Suite Cooling Units (SCUs), rejecting the heat from the servers in the data suites into the cooling water loop
  • Hot aisle containment to support high densities and maximize efficiencies

At a glance

At a glance

Experience in the UK

Hemel Hempstead 1 is part of five existing data centers that we currently operate in Hemel Hempstead and Slough, six once London 1 opens up in autumn 2020. 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 HH1 Data Center is located in Hemel Hempstead, Hertfordshire, which is about 35 km north of London and forms part of the Greater London Urban Area. The high availability of development land in Hemel Hempstead makes it an ideal business location and as a result, the area's Maylands Business Park is the largest business park in the south east with 700 businesses residing there. 

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