Data centre developer DC01UK has sold its South Mimms site in Hertfordshire to Equinix, one of the world’s largest data centre companies and operators.

With a projected total investment value in the region of £3.9bn, the deal lays the foundation for one of Europe’s largest and most advanced data centre campuses.

The 85-acre site in Hertsmere – now named the Hertfordshire Campus by Equinix – will deliver more than two million square feet of data centre space and is being designed to meet both current and future demand for data, storage and AI-powered services.

This deal highlights the UK’s growing prominence in global digital infrastructure investment. It follows the government’s designation of data centres as Critical National Infrastructure last year – an announcement that majored on the scale and ambition of the DC01UK project.

James Craig, director of DC01UK, said: “This is a landmark moment for the UK and a powerful example of local entrepreneurship driving national innovation. The ambition behind the DC01UK project is extraordinary and we are delighted that the vision for this project will be taken forward by leading experts committed to delivering it to the highest standards, maintaining our ambition, realising the community benefits, and embedding themselves in the growth and future of Hertfordshire.

“For us, it’s a proud moment that also marks the beginning of an exciting new chapter as we continue to progress other UK data centre development opportunities to drive further innovation and investment in this space across the UK.”