Nscale, the Nvidia-backed £11 billion British data centre operator, has been told that its 90-megawatt grid connection for its flagship £2 billion Essex AI supercomputer will not be ready in time for its planned 2027 opening. The facility, designed to provide Nvidia GPUs to anchor customers including Microsoft, now faces indefinite delay as UK electricity infrastructure cannot keep pace with AI demand. Nscale is exploring alternative power solutions with Bloom Energy, a California-based supplier of solid oxide fuel cells that generate electricity from natural gas.
The delay is emblematic of a larger UK infrastructure bottleneck. Research firm Sightline Climate found that 26% of global data centre capacity was delayed in 2025, and projects that 30–50% of capacity expected to come online in 2026 could slip due to power constraints, equipment shortages, or opposition. Grid connection queues in Britain stretch a decade or longer; more than 100 UK projects have turned to fuel cells or on-site generation as alternatives. Nscale has also suspended a separate £1 billion OpenAI Northumberland facility after ChatGPT cited high energy costs.
For data centre operators and their customers, grid availability has become the critical path—not permitting or equipment. Nscale has $5+ billion in funding backing and just closed a $900 million credit facility last week, yet capital alone cannot overcome transmission congestion. For architects evaluating compute capacity sourcing, grid-constrained regions are now forcing developers to consider behind-the-meter generation or alternative geographies, with serious implications for UK AI infrastructure ambitions.