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Construction of UK’s ‘largest supercomputer’ delayed over power supply problems

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Cite

Milmo, D. (2026, September 24). Construction of UK’s ‘largest supercomputer’ delayed over power supply problems. The Guardian. https://www.theguardian.com/technology/2026/sep/24/construction-largest-supercomputer-delayed

Dated when The Aporia collected the article, usually within hours of publication. Check the original for its exact date and byline.

The Guardian · collected 2026-09-24 · by Dan Milmo

Quick Summary

The construction of the UK’s largest AI supercomputer in Loughton, Essex, has been delayed due to power supply issues. Initially set to launch by 2027, the project could now face delays until the mid-2030s as UK Power Networks (UKPN) struggles to provide sufficient electricity. The datacentre, built by startup Nscale and valued at $35 billion, is crucial for AI technology but faces significant challenges in obtaining necessary power capacity.
Written by AI on 2026-09-24, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

The construction of what was supposed to be the UK’s largest supercomputer in Loughton, Essex, is facing significant delays due to insufficient local power supply. Initially announced by Nscale, a UK-based startup seeking a $35bn (£26bn) flotation, the project now risks missing its launch date set for 2027 and could potentially be delayed into the mid-2030s. UK Power Networks (UKPN) informed Nscale that it would not be able to supply adequate power until at least the early to mid-2030s. The National Grid and NESO are reportedly working together to explore ways to accelerate connections and support economic growth, but no immediate solution has been found yet. This delay highlights growing concerns over energy infrastructure constraints hindering technological advancements in the UK.

Written for “UK Supercomputer Delayed” on 2026-10-31, grounded in this article and the 0 other(s) covering the same event.

Story

📰 UK Supercomputer Delayed
Technology · 1 article(s) covering the same event.

Compared with similar articles

This article reads unscored and hedges 18% of its claims. Each row says how that neighbour differs.
Semafor
⚖️ Leans left Hedges 1 of 4 claims Outlet record 60/100
“Article A discusses delays in a UK data center project due to power supply issues, while Article B covers Oracle's force majeure declaration for a US data center under construction.”
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
17
sentences that state something as happening or true
Uncertain
18%
3 of 17 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
66/100
The Guardian's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Technology
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-09-24 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

The Guardian · 2749 article(s) · 6 correction(s) detected
Running correction rate · 6 correction(s)

Who wrote this

Dan Milmo
6 article(s) here · 1 carrying a prediction
🔮 Companies building the most advanced AI systems must increase safety efforts, the UK’s AI minister will say, as he announces a strengthening of Britain’s cyber defences.
🔮 Beeban Kidron, a member of the upper house of the UK parliament and an award-winning film director, marshalled an effective political campaign against the proposals by pushing legislative amendments that would have spiked the plans.
🔮 A huge datacentre project hailed by the UK government will miss its launch date next year and could be delayed into the mid-2030s.
🔮 If the worst scenarios come to bear – and experts have differing views on this – then the technology will impact the continent regardless.
🔮 They ordered a review of existing legislation to see what powers they already had, according to those briefed on the plans, and were exploring whether they could force the world’s most advanced technology companies to submit their products for safety testing before launching them.
🔮 Ministers must “heed the warnings” from industry leaders about the threat posed by AI as the government looks to capitalise on the technology, the first secretary, Louise Haigh, will say on Tuesday.
Also by Dan Milmo
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 6 articles by Dan Milmo →

Topics

Essex Loughton National Grid Nscale UKPN

Subjects

Loughton GPE · 4× Nscale ORG · 4× UKPN ORG · 3× National Grid ORG · 2× Essex GPE · 1× Guardian ORG · 1× Keir Starmer’s PERSON · 1× Morning Intelligence ORG · 1× Ofgem ORG · 1× UK Power Networks ORG · 1×

Narrative

National Grid said: “We’re continuing to work closely with NESO [the government-owned National Energy System Operator], distribution network operators and customers to identify opportunities to accelerate connections where possible and support economic growth.”
framing: assertive · carried by 1 article(s) · first seen 2026-09-24
🔮 A huge datacentre project hailed by the UK government will miss its launch date next year and could be delayed into the mid-2030s.

Claims (17 extracted, 3 hedged)

A huge datacentre project hailed by the UK government will miss its launch date next year and could be delayed into the mid-2030s. uncertain
project → hail → mid-2030s
The site in Loughton, Essex, was described as the country’s largest AI supercomputer when it was announced in 2025, but power supply problems mean it now faces a lengthy wait before coming online. asserted
it → describe → wait
Doubts had already emerged about the scheme after the Guardian revealed in March that the planned location was still an operational scaffolding yard. asserted
location → emerge → March
The Loughton supercomputer is being built by Nscale, a UK-based startup seeking a $35bn (£26bn) flotation this year. asserted
supercomputer → build → flotation
UK Power Networks (UKPN), the company that will connect the site to the local power grid, has reportedly told Nscale the grid will not be able to supply sufficient power to the datacentre until the early to mid-2030s. uncertain
grid → connect → mid-2030s
The power delay was first reported by Morning Intelligence, an AI industry newsletter. asserted
delay → report → Intelligence
Nscale said it was “committed to the project” but the failure tofind a quick fix to the power supply issue underlines how much energy has become a hinderance to datacentre development. asserted
energy → say → development
The scaffolding yard site has now been cleared by Nscale, however. asserted
site → clear → Nscale
The company is also investigating whether it can generate power on-site and whether it can speed up the connection process. asserted
it → investigate → process
Keir Starmer’s government cited the Loughton project when announcing the UK’s AI strategy in 2025, describing the site as the “largest UK sovereign AI datacentre”. asserted
government → cite → datacentre
Ofgem, the energy industry regulator, has warned of a logjam in applications for electricity connections. asserted
Ofgem → warn → connections
In June, it revealed there were 315 datacentres queueing to connect to the National Grid, representing 73GW of demand – compared with the peak energy demand for the entire country of 45GW. asserted
it → reveal → 45GW
The Loughton site is seeking up to 90MW of capacity, equivalent to the energy consumption of about 315,000 homes. asserted
site → seek → homes
UKPN said it could not comment on an individual project. uncertain
it → say → project
Schemes with large energy demand also require work to be done at a National Grid level, in order to ensure that energy demands can be met properly. asserted
demands → require → level
“In general, many datacentres, whilst they will connect to our distribution network, are awaiting works on the wider national electricity transmission network before they can begin operation,” said a UKPN spokesperson. asserted
spokesperson → connect → operation
National Grid said: “We’re continuing to work closely with NESO [the government-owned National Energy System Operator], distribution network operators and customers to identify opportunities to accelerate connections where possible and support economic growth.” asserted
We → say → growth
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