Nscale has £2bn, planning permission, Microsoft as a tenant, and Nvidia’s backing for a data center in Loughton, Essex. What it does not have is power. National Grid can’t connect the site in time to open, so Nscale is now hunting for its own electricity. The project is funded, consented, and stuck, and it is not the exception. For anyone who builds, funds, or sells into UK data centers, the pacing item has moved from planning permission to the grid connection.
Nscale has the cash, the site, and the customer. What it does not have is a plug. The London-based AI hyperscaler, backed by Nvidia and founded by Josh Payne, spent months lining up a £2bn data center at Loughton in Essex, with Microsoft as anchor tenant and a 90MW grid connection agreed. Then it learned the electricity would not arrive in time to switch the building on.
So the company is doing what more developers now do when the grid says no: shopping for its own power, reportedly in talks with a California fuel-cell maker rather than waiting on National Grid. This is not a firm running out of road. Nscale grew headcount 121% in the first half of 2026 and raised a $900m credit facility weeks before the delay went public. The block is physical, not financial.
That distinction matters, because Nscale’s problem is really Britain’s. The government made data centers a growth priority and named them critical national infrastructure, and planning reform was meant to clear the path. It cleared the wrong queue. The one that decides whether a permitted project gets built is the wait for a live connection, measured in years.
A consented, funded, Microsoft-anchored data center still cannot switch on because the grid cannot deliver in time. The constraint reshaping UK construction now is energization, not entitlement.
The project that has everything except power
Money, a site, a customer, and no way to turn it on
The Loughton facility is designed to run up to 50MW of compute, scaling to 90MW, and to house tens of thousands of Nvidia GB200 GPUs on a former scaffolding yard. On paper it is exactly what the UK says it wants: private capital, a marquee tenant, and sovereign compute built at home. Every box that used to signal a green light is ticked.
Except the last one. A grid connection used to be a formality. Now it is the most expensive question on the schedule, and Nscale found that out after the money was committed. Building or buying power on-site is faster but far from simple. It turns a data center into an energy campus built alongside the server halls.
We remain fully committed to the Loughton project.Nscale spokesperson, via TNW
The queue no one can skip
Why the grid connection, not planning, is the real bottleneck
Grid-connection times are now the biggest brake on new UK data centers. Some projects face waits close to a decade for enough power, and one estimate found more than a quarter of planned capacity slipped in 2025. Faced with that, developers do the math and go around the grid. More than 100 UK projects are weighing gas generation while they sit in the queue.
The pattern is not confined to Britain. New York became the first US state to freeze new data centers, Scotland has floated its own pause, and US connection waits already run to several years. We covered the same dynamic in Power Is the New Lumber, where the pacing item across whole sectors has become electricity rather than materials.
- Waits close to a decade. Some UK data center connections are timelined in years, not months.
- A quarter of capacity slipped. One estimate found more than 25% of planned UK capacity was delayed in 2025.
- Off-grid as escape hatch. Over 100 UK projects are now weighing on-site gas to skip the wait.
Going off-grid is becoming the plan, not the workaround
What Nscale’s hunt for its own power means for contractors
When a developer decides to make its own electricity, the construction scope changes shape. One building type turns into a co-located campus: the data hall, plus gas turbines or fuel cells, plus battery storage, on compressed schedules with a client that pays for speed. In the US, roughly 50GW of behind-the-meter power was announced in 2025, and the same logic is now landing in the UK.
For the senior executive, this is a category of work arriving at scale, and it rewards firms with power-generation experience and trusted subcontractors. For the ConTech founder, the binding constraint is no longer software or capital, it is energization. We broke down the opportunity in Data Centers Can’t Get Power from the Grid.
The grid story is moving faster than the headlines
Deals, connection queues, and the operator moves shaping the next year of construction. One sharp briefing each week.
Join 3000+ ReadersThe fix is a £35bn contracting pipeline that runs to 2031
Reconductoring, substations, and around 6,000 new grid jobs
The supply side is not standing still. In June 2026, National Grid appointed Balfour Beatty, M Group, Morgan Sindall Infrastructure, Murphy, and OTW to a £1.2bn program covering 1,000km of overhead line reconductoring across England and Wales. Reconductoring means upgrading existing lines with newer-spec materials so they carry more power. It is the next phase of an Electricity Transmission Partnership that follows an £8bn substation phase, and both sit inside a £35bn upgrade program to 2031, with around 6,000 new roles planned including 2,000 graduates and apprentices.
Here is the tension Nscale exposes. The fix is real, funded, and a serious opportunity, but it runs on a grid clock, not a data center clock. A campus that needs power in 18 to 24 months cannot wait for a program stretching to the end of the decade. That gap is why on-site generation keeps winning now.
Grid versus on-site: the two routes to power
A quick-reference comparison for anyone planning a UK data center build
Neither route is clean, and most large builds now end up leaning on both. Here is how they compare.
| Factor | Grid connection | On-site (behind-the-meter) generation |
|---|---|---|
| Typical wait for power | Years, sometimes close to a decade | Roughly 18 to 24 months |
| Who controls the timeline | The network operator | The developer and its contractors |
| Up-front cost and complexity | Lower for the developer | Higher: turbines, storage, and permits |
| Carbon profile | Cleaner as the grid decarbonizes | Often gas-heavy in the near term |
| Construction scope | Data hall plus connection works | Data hall plus a co-located power campus |
| Live UK example | National Grid’s £1.2bn reconductoring program | Nscale’s hunt for its own Loughton power |
It is a £2bn AI data center planned for Loughton in Essex, backed by Nvidia and with Microsoft as anchor tenant. The site is designed to run up to 50MW of compute, scaling to 90MW, and to house tens of thousands of Nvidia GB200 GPUs. It won planning permission and a 90MW grid connection, then hit a power-delivery delay. (Source)
National Grid told Nscale it could not deliver the connection in time for the planned opening. UK grid-connection queues have stretched out badly, with some projects facing waits close to a decade, so the company is now pursuing its own electricity through on-site generation. (Source)
No. More than 100 UK projects are weighing on-site gas while they wait for a connection, and one estimate found more than a quarter of planned UK data center capacity slipped in 2025. New York has frozen new data centers and Scotland has floated a pause, so the grid squeeze is a pattern across the West, not a one-off. (Source)
It turns a data center into a co-located energy campus. Alongside the data hall you build generation, usually gas turbines in the near term, plus battery storage, on a compressed schedule. Roughly 50GW of this behind-the-meter capacity was announced in the US in 2025, and it rewards contractors with power-generation experience. (Source)
In June 2026 it appointed five partners, Balfour Beatty, M Group, Morgan Sindall Infrastructure, Murphy, and OTW, to a £1.2bn program reconductoring 1,000km of overhead lines across England and Wales. It follows an £8bn substation phase and sits inside a £35bn upgrade program to 2031, with around 6,000 new roles planned. (Source)
That number is Nscale’s own claim, broken down as up to 500 construction jobs and a further 250 operational roles over three years. Treat it as a company estimate rather than a verified total, since the Guardian reported it found no clear evidence supporting the 750 figure. Use it as a stated projection, not a fixed fact. (Source)
TNW – Nscale’s £2bn AI data centre hit by UK grid delays
The Construction Index – National Grid picks £1.2bn transmission partners
Nscale – AI hyperscaler Nscale to invest £2 billion in the UK data centre industry
BBC News – Plans for £2bn AI centre and 750 jobs
Capacity – Nscale to invest £2bn in UK data centres
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