Data centres / United Kingdom
Kao Data Harlow campus
OperatingUnited Kingdom7 of 13 fields known
Harlow, Essex, United Kingdom.
- Operator
- Kao Data
- Owner
- Not stated
- Stage
- Operating (source, 2 October 2026)
- Power
- Kao says the campus runs on 100 percent renewable electricity, with HVO fuelled backup generators.
- Cooling
- The operator cites free-air cooled halls with an SLA-backed PUE of 1.2, and says KLON-03 supports hybrid air and direct-to-chip liquid cooling.
- Connectivity
- Carrier neutral; a 2022 release lists carriers including BT Openreach, euNetworks, Jisc, LINX, Lumen and Vorboss.
- Certifications
- BREEAM Excellent, NVIDIA DGX-Ready
Capacity is the operator's stated IT equipment load for the fully built four-building campus, not current live capacity. Per-building MW figures differ between Kao pages (8.8MW versus 10MW for the first two buildings) and their metric is unstated, so they are omitted. Coordinates are the postcode centroid for the campus address.
Capacity
| Measure | Stage | Basis | MW | As of | Source |
|---|---|---|---|---|---|
| IT load | Announced | reported | 71 | 2 October 2026 | source |
These figures measure different things and are not added together.
What we checked
- Kao lists KLON-01 and KLON-02 as operational, KLON-03 as under development and KLON-04 as planned on its Harlow page. (source)
- The campus page says the finished four-building campus would support 71MW of IT equipment load, with potential to reach 150MW of IT load later. (source)
- Kao announced on 8 June 2026 a 10-year deployment for Nebius at the campus, described as 22MW. (source)
- Kao announced KLON-02 as fully commissioned and operational on 28 November 2023. (source)
What we do not know yet
7 of 13 fields in a complete record are filled. Still missing:
- Owner
- Grid connection
- PUE
- Water use
- Chips
- Planning reference
Checked on 2 October 2026. Reported and planned figures are shown as such. Not yet reviewed line by line by a second person. If something is wrong or you know more, tell us.