CyrusOne LON6 Iver Heath

Dromenagh Farm / Sevenhills Road, Iver Heath, Buckinghamshire, United KingdomPermitted

Planned critical IT: 90 MW
Updated: Oct 28, 2026

CyrusOne's current LON6 operator page, checked October 28, 2026, advertises 108 MW of planned IT capacity and still describes the Iver Heath campus as in development. This differs from the 90 MW IT design in the June 13, 2025 announcement; it is not confirmation of commissioned capacity or a newly granted planning permission. The original permitted design comprised six structures and ten data halls. The planned Q3 2026 groundbreaking was not confirmed in this review.

Capacity

Target IT capacity

Planned / design or future potential

90 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

Permitted LON6 full campusAnnounced or preconstruction

6 buildings

Six physical structures containing ten 9 MW data halls; no construction start established.

Initial power and first-capacity deliveryPlanned

Delivery sub-phase is not quantified in MW.

Milestones (4)

LON6 permission reported

Jun 12, 2025 · Recorded actual event

Completed · Permit approved

Source not linked

LON6 groundbreaking target

Q3 2026 · Forecast / planned record

Forecast · Forecast completion

Source not linked

LON6 initial power target

2027 · Forecast / planned record

Forecast · Forecast completion

Source not linked

LON6 first-capacity target

2028 · Forecast / planned record

Forecast · Forecast completion

Source not linked

Participants

CyrusOne

Operator

Sources by role

Operator (1)

CyrusOne Plans Pioneering New London Facility with Sustainability At Its Core · Jun 13, 2025 · Corroborating

Operator (1)

Data Center — London, UK: LON6 · Primary

CyrusOne UK6 Limited

Owner

Sources by role

Owner (1)

60,000sqm data centre approved for Iver Heath · Jun 17, 2025 · Primary

Scottish and Southern Electricity Networks

Operator

Sources by role

Operator (1)

CyrusOne Plans Pioneering New London Facility with Sustainability At Its Core · Jun 13, 2025 · Corroborating

Operator (1)

Data Center — London, UK: LON6 · Primary

Other participants (3)

Buckinghamshire Council

Government authority

Sources by role

Government authority (1)

60,000sqm data centre approved for Iver Heath · Jun 17, 2025 · Primary

Montagu Evans

Contractor

Sources by role

Contractor (1)

CyrusOne gets approval for £1.2 billion data centre in Buckinghamshire · Jun 30, 2025 · Corroborating

Contractor (1)

CyrusOne Plans Pioneering New London Facility with Sustainability At Its Core · Jun 13, 2025 · Primary

UK Government departments

Government authority

Sources by role

Government authority (1)

CyrusOne Plans Pioneering New London Facility with Sustainability At Its Core · Jun 13, 2025 · Primary

Capital & incentives

Capital claims and financing records may overlap. Their amounts are not added together.

Capital claims

Planned investment

Transaction scope

£>1200000000

Source

Financing records

Investment commitment

£1,200,000,000

Jun 13, 2025

More-than amount for local/national economic investment; financing structure and draw schedule undisclosed.

Parties & sources

CyrusOne (Sponsor)

Sources (2)

CyrusOne gets approval for £1.2 billion data centre in Buckinghamshire · Jun 30, 2025
CyrusOne Plans Pioneering New London Facility with Sustainability At Its Core · Jun 13, 2025

Incentives

Incentive

Status not stated · UK Government departments

HM Treasury, DBT, DSIT and Office for Investment support was described as critical; no cash, tax rate, term or formal award is attached.

Technical specifications

Grid feed voltage

Actual

132 kV

Source

Initial power target

Forecast

Mid 2027

Initial power and first-capacity delivery · Phase

Source

Additional project facts

Project status

Permitted

Full planning permission; preconstruction

Source

Technical IT space

Forecast

30,000 sqm

Source

Data hall count

Design

10 count

Source

Physical data center structures

Design

6 count

Permitted LON6 full campus · Phase

Source

Utility supply design

Design

160 MVA

Source

Planning permission

Permitted

Full planning permission in place; conditions/phasing details remain

Permitted LON6 full campus · Phase

Source

Biodiversity net gain

Forecast

71 percent

Source

Planned tree planting

Forecast

670 count

Source

Public access green space

Forecast

18 acres

Source

First capacity target

Forecast

Early 2028

Initial power and first-capacity delivery · Phase

Source

Infrastructure & permits

Technical details (4)

Electric grid

Planned or represented

160 MVA

grid supply — 160 MVA; design.

Renewable energy supply

Planned or represented

64 percent regulated office energy

rooftop solar — 64 percent_regulated_office_energy; design target.

Heat reuse

Planned or represented

heat export; design capability.

Cooling system

Planned or represented

air cooled free cooling; design.

Building · Documented

CyrusOne LON6 / Iver Heath Data Park

Buckinghamshire Council

Jun 12, 2025

Sources (2)

CyrusOne gets approval for £1.2 billion data centre in Buckinghamshire · Jun 30, 2025 · Corroborating
60,000sqm data centre approved for Iver Heath · Jun 17, 2025 · Primary

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