Stellanor Adds AI-Ready Data Centre in UK Deal

Stellanor has confirmed the acquisition of a purpose-built data centre in Hemel Hempstead from Imagination Technologies, extending its UK footprint to 11 facilities. 

The agreement takes the form of a sale-and-service-back arrangement, which means Imagination continues to operate from the site as a fully managed Stellanor client.

The facility supports GPU workloads and AI chip design, and with this addition, Stellanor reaches 39MVA of secured grid capacity, reflecting rapid growth from two sites to 11 within six months.

Expanding AI-ready infrastructure

Michael Tobin, Chairman of Stellanor, lauds the acquisition and what it represents for the company.

"This acquisition demonstrates the quality of infrastructure and tenants we're attracting," says Michael.

"Imagination Technologies is exactly the type of blue-chip technology company we serve – organisations with demanding infrastructure requirements that need urban proximity and institutional-grade capability. 

“Their decision to continue operating from this facility as a Stellanor client validates our strategy: combining investment in facility improvement with operational excellence. 

“We're building a differentiated platform in the UK market with the scale and capability to deliver AI-ready infrastructure around the corner from our clients' operations."

Sale-and-service-back model in practice

The sale-and-service-back structure allows Imagination to retain operational continuity while transferring asset ownership. This ensures workloads remain uninterrupted while infrastructure investment and management shift to a specialist operator.

"As a global semiconductor IP company, our focus is on delivering high-performance, power-efficient GPU and AI technologies that enable our partners to build next-generation products," says Markus Mosen, CEO of Imagination Technologies.

"Maintaining operational resilience across our infrastructure is critical to supporting continuous innovation. Our partnership with Stellanor strengthens this foundation, ensuring we have the robust, scalable environments needed to support our teams while enabling us to remain agile and focused on advancing our core technologies."

UK growth and capacity build-out

Stellanor launched in September 2025 with two London facilities and is now expanding rapidly through acquisition. The company is also progressing a second deal involving Redcentric’s eight UK data centres, which is expected to close in the coming months.

This expansion increases available grid capacity – the amount of electrical power secured from the national grid – which can be a limiting factor for high-performance data centres. AI workloads, particularly those using GPUs, consume large amounts of electricity, making access to power a core competitive factor.

By combining existing urban locations with AI-ready upgrades, Stellanor positions its portfolio to meet enterprise demand for scalable, high-density environments.

The Hemel Hempstead facility adds to this approach by providing a site already configured for advanced chip design, reducing the need for extensive retrofitting and enabling faster deployment of compute workloads.