Mapped (unverified)
Hertfordshire Data Centre
Welwyn Garden City, Hertfordshire, United Kingdom
Source: OpenStreetMap
Hertfordshire Data Centre is a mapped data center in Hertfordshire, United Kingdom. DataCentersExposed has documented a 127,877 sq ft footprint and 1 environmental-permit record at this site. 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 12, 2026
Real parent
—
Operator
—
Est. capacity
~25-55 MW
Footprint
127,877 sq ft
Grid carbon
217 gCO₂/kWh
Clean electricity
64%
Region
Hertfordshire
Overview
source: linkWas labelled as HSBC but I believe it's not (entirely) occupied by them any more.
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)- England round-up: Council house barriers | Bucks data centre | Eton controversyThe Planner magazine· Sep 11, 2026
- Application for information boards near controversial South Mimms data centreWelwyn Hatfield Times· Aug 27, 2026
- IJM lifts near-term order book target as UK projects turn around, Penang LRT and Nusantara jobs finalise — KenangaEdgeProp· Jul 21, 2026
- Concerns raised over 112-home neighbourhood proposed near M25 in Potters BarWelwyn Hatfield Times· Jul 1, 2026
- Topshop coming to Hertfordshire as return to UK high streets confirmedWatford Observer· Feb 17, 2026
- Milestone reached as work begins on turning ex-pub into tech hubWelwyn Hatfield Times· Jan 15, 2026
Environmental permits
source: Permit register- COLT DATA CENTRE SERVICES UK LIMITEDEPR/KP3139DWEPR permit · holder "COLT DATA CENTRE SERVICES UK LIMITED" · Welwyn Hatfield area of responsibility, after 1 April 2012 · Combustion; Any Fuel =>50MW - 1.1 A(1) a) · within ~2 km of the mapped site
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