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CARTIS

Colt London North Data Centre

Welwyn Garden City, England, United KingdomOperating
Evidence
Planned critical IT
35 MW
Updated
Oct 28, 2026

Colt London North is the operating Welwyn Garden City facility, not a Hayes campus phase. The 35 MW operator boundary is supported by independently documented utility and fibre infrastructure and is not treated as measured utilization. Tenant utilization, contract pricing and undisclosed project financing remain outside the verified public record.

Capacity

Reported capacity

Design

35 MW

Source

Reported capacity

Design

35 MW

Source

Operating IT capacity: Not established in published records

A missing figure does not mean zero. Planned, utility and generation figures are not operating IT capacity.

Development

Operating facility and documented expansionOperational

Colt London North is the operating Welwyn Garden City facility, not a Hayes campus phase. The 35 MW operator boundary is supported by independently documented utility and fibre infrastructure and is not treated as measured utilization. Tenant utilization, contract pricing and undisclosed project financing remain outside the verified public record.

Participants

Colt Data Centre Services

Developer

Sources by role
Developer (1)

Site & development

Location context

Actual

Colt London North | Welwyn Garden City | England | GB

Source

Location context

Actual

Colt London North | Welwyn Garden City | England | GB

Source

Project location

Actual

Welwyn Garden City, England, GB

Source

Gross technical area

Actual

21,339 square metres

Source

Onsite substations

Actual

2 substations

Source

Additional project facts

Lifecycle status

Actual

Operating

Source

Capacity basis

Actual

Colt Data Centre Services publishes 35 MW of IT power for this project boundary.

Source

Lifecycle status

Actual

Operating

Source

Capacity basis

Actual

35 MW is the operator published facility IT-load boundary; it is not measured customer utilization.

Source

Operator confirmed

Actual

Colt Data Centre Services

Source

Current lifecycle

Actual

Operating

Source

Capacity classification

Actual

It load

Source

Capacity basis

Actual

35 MW is the operator published facility IT-load boundary; it is not measured customer utilization.

Source

Customer utilization

Actual

Not publicly disclosed

Source

Identity boundary

Actual

This facility or named campus is tracked separately from adjacent buildings and broader operator portfolios

Source

Source refresh date

Actual

2026-08-29

Source

Infrastructure & permits

Technical details (3)
Electric grid

Operational

35 MW

35 MW is the operator-published facility IT-load boundary; it is not measured customer utilization.

Fiber

Operational

Carrier-neutral or resilient fibre connectivity is described for the individual facility.

Cooling system

Operational

Cooling architecture supports the stated lifecycle; actual tenant draw and instantaneous load remain undisclosed.

Public-source research. Plans may change. See Evidence for sources and qualifications.

Related projects (3)
Colt London 4 Data Centre

Under construction · Hayes, England, United Kingdom

Shared participant: Colt Data Centre Services · Same market: England, United Kingdom

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Colt London 5 Data Centre

Preconstruction · Hayes, England, United Kingdom

Shared participant: Colt Data Centre Services · Same market: England, United Kingdom

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Colt London 6, 7 and 8 Data Centres

Preconstruction · Hayes, England, United Kingdom

Shared participant: Colt Data Centre Services · Same market: England, United Kingdom

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