Pure Data Centres Group has completed installation of the third and final transformer at its 90MW LON01 data-centre campus in Brent Cross, North London. The 75MVA Hitachi transformer lifts the substation’s total installed capacity to 150MVA. Energisation was planned for later in October 2026, but the milestone does not mean the wider campus is complete: the LON01B2 expansion remains under construction and is scheduled for completion in the second quarter of 2029.
What Pure DC installed
The new unit is a 75MVA Hitachi power transformer, the final of three transformers serving the LON01 campus. Once energised, it will complete the dedicated power system designed for the site and bring the substation’s total capacity to 150MVA.
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Transformer capacity is expressed in megavolt-amperes (MVA), an apparent-power rating used for electrical infrastructure. The campus itself is described in megawatts (MW), a measure of real power available to its computing and cooling systems. The two figures are related but are not interchangeable; the 150MVA substation rating does not mean the campus suddenly becomes a 150MW facility.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhy the lift required a specialist gantry
The installation took place beside a live substation and within a restricted operational campus. That geometry ruled out the conventional 500-tonne crane normally considered for a transformer of this type.
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Instead, the project team designed and deployed a specialist gantry rated to lift up to 1,000 tonnes. Pure DC, MGE Group, logistics partners and specialist suppliers completed the move into position in a four-hour operation. The method allowed the transformer to be placed without taking the surrounding live infrastructure out of service or requiring the clearance that a large mobile crane would have needed.
From Colombian manufacture to Brent Cross
The transformer’s delivery was an 18-month programme rather than a short on-site installation. Manufacturing began in Colombia in March 2025, and factory testing finished in June 2026. The unit then travelled by sea to the United Kingdom before making its final journey to the Brent Cross campus.
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- 【As a step-up transformer】 The input voltage behind the unit is selected as "110V", which converts the local voltage of 110V/120V in the United States, Canada, Mexico, etc. to 220V/230V/240V to support the use of 220V-240V electrical appliances from China, Australia, the United Kingdom, Germany, Italy, and other countries.
- 【As a step-down transformer】 The input voltage behind the unit is selected as "230V", which converts the local voltage of 220V/230V/240V in the China, Australia, UK, Germany, Italy and other countries. to 110V/120V to support the use of 110V-120V electrical appliances from United States, Canada, Mexico, etc.【NOTE】The transformer is equipped with an US power cord, if used in other 220V-240V country you MUST need a plug adapter.
- 【AC Input】Equipped with an US Power Cord.Features a universal power wiring slot, allowing you to purchase a separate power cord tailored to the outlet specifications of different countries for easy connection and usage.
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That last leg required route planning, road closures and approvals from local authorities. Large transformers are unusually difficult road loads because of their weight, dimensions and handling limits, so the route and lifting plan had to be coordinated with the campus construction schedule and the operating substation.
What the transformer enables at LON01
The transformer supports the campus’s B1 and B2 buildings. Dedicated ductwork for B2 is already in place, linking the electrical infrastructure milestone to the next stage of the development rather than marking the end of construction.
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- Primary Voltage: 120/208/240 V AC ,
- Secondary Voltage: 24 V AC
- Power Rating：40 VA
- Compatibility: Transformers can be used in industrial, heating and air conditioning controls including air conditioning circuits, relays and gas valves or other applications up to the listed ratings
- Directly tested with a multimeter is no-load voltage: AC26.6V-27.5V
LON01 is being developed as a closed-loop, liquid-cooled data centre for high-density artificial-intelligence inference and cloud workloads. Liquid cooling is intended for equipment whose heat output can exceed what conventional room-air cooling can efficiently remove. The completed power train will therefore be an enabling part of the high-density design, while the buildings, internal systems and commissioning work still have to progress.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where the Brent Cross expansion stands
LON01B2 is described by Pure DC as the final major build phase at Brent Cross. The project adds 70MW and more than 23,000 square metres, taking the overall campus capacity to 90MW. Completion is scheduled for Q2 2029.
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- Safety and Protections: Over-current, over temperature, short-circuit and overload. Note: USB outputs are completely isolated from the AC power to keep your devices safely.
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Construction and fit-out are continuing inside a live operational campus, alongside existing infrastructure. That constraint affects sequencing, access, safety controls and temporary works: new equipment must be installed without disrupting systems already supporting operations.
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| Project element | Reported figure or status |
|---|---|
| Campus capacity after the expansion | 90MW |
| Final transformer | 75MVA Hitachi unit |
| Total substation capacity after installation | 150MVA |
| Specialist lifting equipment | 1,000-tonne-capacity gantry |
| Transformer positioning time | Four hours |
| LON01B2 expansion | 70MW and more than 23,000 square metres |
| Scheduled B2 completion | Q2 2029 |
Environmental plans for B2
After B2 is complete, the site is planned to include a living wall wrapping around the building with more than 750,000 plants. Pure DC says the feature is intended to reduce noise and air pollution and support biodiversity beside Brent Reservoir’s Site of Special Scientific Interest.
The living wall is a planned element of the completed development, not a benefit delivered by the transformer installation itself. Its eventual performance will depend on the final design, planting and long-term maintenance of the system.
Quick Recap
What happens next
- Energisation: The newly installed transformer was planned to be energised later in October 2026, subject to the project’s commissioning and safety procedures.
- Building construction: Work on the LON01B2 structures and associated services continues within the operating campus.
- Fit-out and commissioning: Electrical distribution, liquid-cooling systems and data-centre equipment must be installed, tested and commissioned before the expansion can support workloads.
- Target completion: Pure DC’s stated schedule places completion of the B2 phase in Q2 2029.
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