Mapped (unverified)colocation
NTT Hemel Hempstead 3 Data Center (HH3)
Hemel Hempstead, Hertfordshire, United Kingdom
Source: Primary source
NTT Hemel Hempstead 3 Data Center (HH3) is a mapped data center in Hertfordshire, United Kingdom. It runs on United Kingdom's grid, which was 36% fossil-fuelled at 217 gCO₂e/kWh in 2025 (Ember).
Reporting by Eric Keller · Updated Jun 17, 2026
Real parent
—
Operator
—
Grid carbon
217 gCO₂/kWh
Clean electricity
64%
Region
Hertfordshire
Overview
source: linkNTT DATA's Global Data Centers division — colocation facility (1 networks present). Source: PeeringDB.
The grid behind this site
source: Ember · EurostatGrid carbon intensity
217 gCO₂/kWh
Clean electricity
64%
Fossil electricity
36%
National grid context, not this facility's own metering. Full country picture: United Kingdom data centers.
In the news
source: Google News (local + English)- NTT decommissions data center outside LondonData Center Dynamics· Apr 21, 2026
- Stellanor Adds AI-Ready Data Centre in UK DealData Centre Magazine· Apr 13, 2026
- Stellanor buys UK data centre from Imagination TechnologiesTelecompaper· Apr 9, 2026
- Stellanor acquires data center outside London from chip design firm ImaginationData Center Dynamics· Apr 8, 2026
- Stellanor acquires AI-ready Hemel Hempstead data centre from Imagination Technologiescapacityglobal.com· Apr 8, 2026
- Stellanor expands to 11 facilities with acquisition of AI-ready data center from Imagination TechnologiesBeBeez International· Apr 8, 2026
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