Moving a transformer isn’t just a lift, it’s a sequencing exercise, and it’s where deep high-voltage plant installation experience earns its keep.

We’re proud to be supporting Principal Contractor, Sweet Projects, on the installation of transformers and associated ancillary equipment within a substation currently under construction, on a programme with no room for slack. Work like this draws on years of specialist experience in high-voltage plant installation: knowing how to sequence heavy lifts, protect live and incoming infrastructure, and keep a build on track without compromising safety.

The lifts themselves required a 750-tonne mobile crane and careful coordination to manoeuvre the equipment through both temporary and permanent steelwork, work that only came together through close collaboration between our electrical installation team, lifting specialists, structural engineers, steelwork contractors and the wider construction team.

Behind the lift was a just-in-time logistics strategy: every component delivered in sequence, timed against the programme and site constraints. That kind of precision, coordinating suppliers and hauliers so the right equipment lands at the right moment, is second nature to teams who’ve done this at scale, again and again.

Planning like this rarely makes the headline, but it’s what makes complex high-voltage installations like this land safely and on time.

JSM Group, a leading provider of integrated utility infrastructure solutions, has commenced construction of the high voltage substation and cable route for maincubes’ new data centre campus in Nauen, Germany. The start of works follows the granting of the building permit for the energy infrastructure and represents a major milestone in the delivery of the mainHub Berlin campus. JSM Group is responsible for the delivery of the company owned 110 kV cable route and substation – critical components that will underpin the campus’s long term energy security and scalability. The approximately six kilometre cable route will transport electricity from renewable energy sources via the modern E.DIS distribution network to the site’s 110 kV substation.

Enabling high performance infrastructure for cloud and AI

The new campus has been designed with a grid connection capacity of 200 megawatts (MW), with further expansion options, to support high performance computing environments, including advanced AI workloads and complex data analytics. Through the delivery of this critical energy infrastructure, JSM Group is enabling a resilient, future proof power supply aligned with the demands of next generation digital services. maincubes selected Nauen as the site for its new campus due to the Berlin Brandenburg region’s stable energy supply, strong renewable generation from wind and photovoltaics, and favourable conditions for sustainable growth. The project further strengthens the region’s position as a hub for modern digital infrastructure. Oliver Menzel, CEO of maincubes, said:
The start of construction of the substation is the next visible step on our journey toward mainHub Berlin. In Nauen, a state of the art data centre location is being created – regionally rooted and internationally connected. In doing so, we are consistently continuing the success story of maincubes and reinforcing our commitment to sustainable, energy efficient and resilient digital infrastructure.
Michael Booth, CEO of JSM Group, commented:
This project highlights JSM Group’s capability to deliver complex, high voltage energy infrastructure for mission critical environments. Data centres of this scale demand absolute reliability, technical excellence and close collaboration with our partners. We are proud to be playing a central role in enabling maincubes’ expansion in the Berlin region and supporting the delivery of sustainable, high performance digital infrastructure.
Dr. Michael Wiebersinsky, Mayor of the City of Nauen, added:

With the new data centre campus, our region is developing into a highly modern location where future innovations can emerge. From a sustainability perspective, it gives me confidence that Nauen will be a reliable partner for the operating company maincubes.

Hanjo During, Managing Director of E.DIS Netz, said:
With the campus currently under development, we will connect a particularly high performance data centre to our regional electricity distribution network. With the campus planned here in Nauen, the connected capacity will increase significantly in the future.
With the Nauen development, maincubes continues to expand its presence in the capital region, building on the successful operation of its first Berlin data centre, BER01.