The Nscale-led supercomputer project in Loughton, Essex, is facing substantial delays, with its operational timeline potentially pushed back by several years. Originally slated for a 2027 debut, the facility, which the UK government highlighted in its 2025 AI strategy as the "largest UK sovereign AI datacentre," is encountering difficulties securing adequate power from the national grid.
UK Power Networks (UKPN), the entity responsible for connecting the site to the local power grid, has reportedly informed Nscale that the necessary power supply may not be available until the early to mid-2030s. This reported delay, initially brought to light by the AI industry newsletter Morning Intelligence, underscores growing challenges in energy provision for large-scale data center developments.
The Loughton site is designed to require up to 90 megawatts (MW) of power, an amount comparable to the energy consumption of approximately 315,000 homes. UKPN has stated that it cannot comment on specific projects. However, a spokesperson noted that many data centers connecting to their distribution network are awaiting upgrades to the wider national electricity transmission network before they can commence operations. Ofgem, the energy industry regulator, has previously issued warnings regarding a backlog in applications for electricity connections.
Nscale, a UK-based startup reportedly seeking a $35 billion flotation this year, maintains its commitment to the project. The company is exploring alternative solutions, including generating power on-site and attempting to accelerate the grid connection process. While the site, which was previously an operational scaffolding yard, has now been cleared by Nscale, a definitive alternative timetable for the supercomputer's launch has not been announced.
This delay for the Loughton project comes as other significant AI supercomputing initiatives in the UK and Europe have progressed. The Isambard-AI supercomputer, located in Bristol, was launched in July 2025. Developed by the University of Bristol in collaboration with HPE and NVIDIA, Isambard-AI is the UK's most powerful AI supercomputer, achieving operational status in under two years from conception to deployment. It provides 21 exaflops of AI performance and is a key component of the UK Government's AI Research Resource (AIRR). Similarly, JUPITER, Europe's first exascale supercomputer, was inaugurated in Germany in September 2025. JUPITER, built by Eviden, is capable of delivering one exaflop of computing power and is ranked among the world's most powerful and energy-efficient systems.
The challenges faced by the Loughton project highlight the increasing strain on existing power infrastructure as demand for energy-intensive AI data centers grows. The UK government's ambition, stated in 2025, to increase the country's compute capacity twentyfold by 2030, relies on the timely delivery of such facilities.