Kao Data Harlow campus (KLON-01 to KLON-03), London Road, Harlow
Kao Data
Kao Data's AI-focused campus on the former STC/Nortel research site at London Road, Harlow, operating since 2018. KLON-01 opened in 2018; KLON-02 (10 MW) was completed and operational on 28 November 2023. A third building, KLON-03 (17.6 MW), is under construction, with its backup generators covered by an Environment Agency permit variation. Plot F (KLON-07 and KLON-08) on Harlow Innovation Park is a separate record.
Reality Score
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Key facts
- Operator / developer
- Kao Data
- Location
- London Road, Harlow, CM17 9NA, East of England, United Kingdom
- Status
- Operational
- Facility type
- Data centre
- AI relevance
- High — AI/compute led
Power & grid
- Published capacity
- 20 MW — Published IT loadThe IT load the operator or planning documents state the facility will draw.
- Share of UK tracked capacity
- 0.5% of published it load
- Power
- KLON-01 and KLON-02 about 10 MW each (KLON-02 8.8 MW, stretching to 10 MW). KLON-03 adds 17.6 MW and is under construction. EA permit variation covers 11 new 8.01 MWth generators for KLON-03.
Planning
- Council
- Harlow District Council
- Planning route
- Local planning (TCPA)
Timeline
Sources
- Kao Data announces its second, 10MW Harlow data centre is now live and operational
Secondary source · Kao Data (primary, operator) · 2023-11-28
- Kao Data expands Harlow campus with construction of second 10MW data centre
Secondary source · Kao Data (primary, operator) · 2022-03-01
- Harlow Operations Limited permit variation V002, non-technical summary
Secondary source · Environment Agency (primary, regulator) · 2025-03-31
- Kao plans third data center at Harlow UK campus
Secondary source · DatacenterDynamics (secondary)
Last verified
6 November 2026
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