CryrusOne LON4
Slough, Slough, United Kingdom
Source: OpenStreetMap
CryrusOne LON4 is a mapped data center in Slough, United Kingdom, operated by CyrusOne LLC. DataCentersExposed has documented a 125,302 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 LON4 is a mapped data center in Slough, United Kingdom, operated by CyrusOne LLC. Available records put its footprint at 125,302 square feet. Ownership above the operator is not disclosed in the facts at hand.
Operator chain
- Ultimate parentCyrusOne LLC
- Files asCyrusOne LLC
- This facilityCryrusOne LON4
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 UK4 LIMITEDEPR/EP3508PSEPR permit · holder "CYRUSONE UK4 LIMITED" · Slough · Combustion; Any Fuel =>50MW - 1.1 A(1) a) · within ~2 km of the mapped site