CyrusOne LON3
Slough, Slough, United Kingdom
Source: OpenStreetMap
CyrusOne LON3 is a mapped data center in Slough, United Kingdom, operated by CyrusOne LLC. DataCentersExposed has documented a 50,089 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 14, 2026
Most sites are mapped — located but awaiting a second source. How we verify
Dot size = disclosed capacity (MW). Smallest = undisclosed, not small.
Overview
source: linkCyrusOne LON3 is a mapped data center in Slough, United Kingdom, run by CyrusOne LLC. Available records put its footprint at 50,089 square feet. The site is identified as a CyrusOne data center, though ownership above the operator is not detailed in the verified record.
Operator chain
- Ultimate parentCyrusOne LLC
- Files asCyrusOne LLC
- This facilityCyrusOne LON3
The grid behind this site
source: Ember · EurostatNational grid context, not this facility's own metering. Full country picture: United Kingdom data centers.
In the news
source: Google News (local + English)- Public inquiry opens into 147MW Slough data center schemeData Center Dynamics· Oct 16, 2025
- CyrusOne announces plans for 90MW data center campus in Buckinghamshire, UKData Center Dynamics· Jun 13, 2025
- Yondr launches second data center in Slough, UKBeBeez International· Apr 11, 2025
- Yondr breaks ground on third facility at 100MW London campusData Center Dynamics· Feb 12, 2025
- US companies to invest £6.3bn in UK data centersData Center Dynamics· Oct 14, 2024
- Another large data centre plan put in for IverSlough Express· Aug 8, 2024
Environmental permits
source: Permit register- CYRUSONE UK3 LIMITEDEPR/EP3608PMEPR permit · holder "CYRUSONE UK3 LIMITED" · Slough · Medium Combustion Plant collectively =>50MW - 1.1 A(1) a) · within ~2 km of the mapped site