NTT Communications HH3, Hemel Hempstead

  • Gyron Hemel data centre

Project Description

NTT Communications HH3, The Campus, Maylands Avenue, Hemel Hempstead, HP2 7TN

  • NTT/Gyron’s huge new Hemel data centre opened 2016
  • 100,000 sq ft/20MW of net technical capacity
  • Very high quality retail colocation from NTT
  • Large-scale dedicated halls of 1MW+ from Gyron
  • High-power rack densities, 20kW possible

Colo-X analysis

HH3, Hemel Hempstead 3 is NTT/Gyron’s third data centre in Hemel Hempstead and is a huge 20MW/100,000 sq ft (net tech) facility which opened in the second half of 2016.  HH3 is located 1/4 of a mile away from NTT/Gyron’s 8MW Mayland’s data centre.

Gyron was acquired by NTT Communications in June 2012 and became part of the global portfolio of data centre businesses acquired by the Japanese head quartered service provider.

By combining the high quality wholesale focussed Gyron data centres with the enterprise and service approach of NTT Communications, HH3 can either be used for retail colocation services from NTT (starting at a half rack upwards) or large scale dedicated data halls of 1MW+ from Gyron on a wholesale basis.  The facilities are impressive, HH3 especially so with a cool urban-tech finish combined with the sheer scale of the site which offers both high density per rack and ultra low PUEs.  Reasonable connectivity options.  Great for enterprise colocation customers.  Worth remembering Dimension Data also part of the NTT family for hardware provision and support.


Facility description

NTT Communications HH3 facility is a hugely impressive two story, brand new data centre of 30MW gross or 20MW of net tech, delivered across 20 x 1MW data halls, which in turn are delivered across two buildings, Phases 1 & 2.  As each data hall has its own dedicated plant there is some scope to vary the specifications from the Tier3 equivalent base standard.  We understand NTT will be seeking Tier4 certification for their dedicated suites for example.

At Q1 2017 we understand all of Phase1 is fully let and Phase 2 rapidly approaching completion with a fair amount of this already sold.  We therefore estimate the site overall to be some 60% already.


Technical stats

Size100,000 sq ft of net technical capacity
Total customer power20MW
Percentage occupied60% (but rack space available in NTT suites)
Operational since2016
Installed clients6 direct customers, many more including colo customers
Networks available on site6
Standard power5kW up to 20kW per cabinet
24/7 on-site supportYes
24/7 accessYes
PricingPOA – competitive
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