The data centre rush

1. 12 Sep 2024

   Critical National Infrastructure

   Data infrastructure becomes the first new CNI sector since space and defence in 2015: a dedicated government monitoring team and prioritised security agency access. A security status; it changes no planning law and carries no funding.

2. 25 Sep 2024

   Blyth: the first mega announcement

   Blackstone commits 10 billion pounds to an AI data centre at Blyth in Northumberland.

3. 6 Dec 2024

   First green belt call in allowed

   Ministers allow a 65,000 square metre data centre at Iver, Buckinghamshire, on appeal, accepting it is inappropriate green belt development but finding very special circumstances. A second, Abbots Langley (84,000 square metres), follows in May 2025. Both appeals were recovered for ministerial decision on 8 July 2024, four days after the general election.

4. 13 Jan 2025

   AI Opportunities Action Plan

   AI Growth Zones created, Culham named first; 14 billion pounds of private commitments announced within 48 hours; a pledge to grow public compute twentyfold by 2030.

5. 17 Jun 2025

   The water gap goes official

   The Environment Agency's National Framework for Water Resources addresses data centres for the first time, states large sites can consume millions of litres a day, and admits it cannot obtain consumption data.

6. 15 Jul 2025

   NESO plans for a demand surge

   Future Energy Scenarios 2025 puts data centre demand at about 7.6 TWh and projects roughly 33 TWh by 2035 on its ten year forecast.

7. 31 Jul 2025

   CMA finds the cloud market broken

   The cloud services investigation finds Microsoft and AWS hold significant unilateral market power in a 10.5 billion pound market and recommends digital markets investigations.

8. 16 Sep 2025

   Tech Prosperity Deal

   31 billion pounds of AI infrastructure commitments recorded around the US state visit, Stargate UK launched, and the North East becomes the second AI Growth Zone.

9. 6 Nov 2025

   Ofgem: the queue triples

   The regulator reports grid demand connection applications grew from 41 GW to 125 GW in seven months, with data centres a significant share of the growth.

10. 8 Jan 2026

    A planning route of their own

    Regulations take effect letting data centre developers opt into the nationally significant infrastructure regime, bypassing local planning. Three directions granted by July 2026; the first, a Buckinghamshire campus of up to 300 MW.

11. 29 Jan 2026

    Fifth AI Growth Zone

    Lanarkshire joins Culham, the North East, North Wales and South Wales. Government credits the five zones with 28.2 billion pounds of prospective investment.

12. 30 Jun 2026

    The state starts measuring

    DESNZ publishes the first official estimate of data centre electricity use, statistics still formally in development. ONS follows in August, noting data centres are not separately visible in the national accounts.

13. 17 Aug 2026

    Scotland moves to take control

    In one day the Scottish Government directs councils to notify ministers of every data centre application over 50 MW within 7 days, recalls the refused Edinburgh scheme's appeal for its own decision, and orders environmental impact assessments on two live applications.

The energy case

• NESO curtailed 13% of potential wind output in 2024/25, which it attributes to the large share of wind capacity being connected in Scotland, at present a constrained region of the network; managing thermal constraints cost 1.7 billion pounds, up 64% in a year
• Its evidence to Parliament: with sufficiently strong locational signals, a maximum of 20% of future data centre demand could locate in Scotland, using renewable power behind the constraint rather than curtailing it, subject to connections and system security on low wind days
• The price signal already exists: both Scottish transmission zones carry a zero floored locational demand charge, against up to about 14 pounds per kW in south west England, and growth zone data centres are promised up to 24 pounds per MWh off electricity costs from April 2027, subject to legislation, the deepest discount of any zone, funded by recycling the constraint savings they create
• Scotland generated the equivalent of 113% of its own electricity consumption from renewables in 2022, the latest year that measure was published, and exported a third of its generation in 2023

• Thames Water has identified 108 proposed hyper or large data centres in its supply area, each potentially demanding peak water equivalent to thousands of homes
• Affinity Water, whose region covers the Slough to west London corridor, counts about 125 proposed or under construction, told Parliament data centre demand is not in its statutory water resources forecasts, and has received individual requests of up to 35 litres a second, the peak demand of 3,500 homes
• One proposal sought 21 million litres a day, the water needs of roughly 147,000 people
• An industry survey with Environment Agency involvement, the only sector wide evidence so far, found 51% of responding sites use waterless cooling; it is not an official statistic

Parliament's Environmental Audit Committee and a Lords drought inquiry are examining exactly this absence. Until someone measures it, every national claim about data centre water use, reassuring or alarming, is unverifiable.

An official register or count of UK data centres

Does not exist. DSIT holds an internal dataset of colocation sites; it is unpublished. The nearest official figure is a statistical byproduct: DESNZ matched meters at 2,423 commercial sites.

Official electricity statistics

First published 30 June 2026, formally still in development, Great Britain and commercial sites only. Before that, data centres sat invisibly inside post and telecommunications in the national energy tables.

Official water statistics

None. The Environment Agency states it cannot obtain the data; statutory water resource plans do not include data centre demand in their forecasts.

An industrial classification

None. Parliament's own library notes that without one the sector's economic impact is difficult to identify; ONS wrote in August 2026 that data centres are not separately visible in the national accounts.

Delivered capacity from the announced boom

No official measure. Capacity figures in circulation (about 1.6 GW today, about 6 GW by 2030) are industry estimates quoted inside official documents, not government statistics.

How much of the announced investment will be delivered?

Unknowable from the official record, which counts announcements. The government's own rolling totals, 25 then 39 then 44 billion pounds, overlap and mix firm commitments with explicit aspirations such as Blackstone's aim of over 100 billion pounds across a decade. No official series tracks delivery against announcement.

Can the grid actually supply a 50 GW queue?

The queue is not a plan. NESO says most of it lacks final investment decisions and expects many projects to be non viable; Great Britain's entire peak demand is about 45 GW. The system operator's own forecast is for demand to roughly quadruple by 2035, to about 33 TWh, well within total system growth but heavily dependent on where sites connect.

Why does Slough matter so much?

Measured consumption says the existing estate is extraordinarily concentrated: 65% of all grid electricity in Slough already goes to data centres, and the South East plus London take 77% of the national total. Concentration is why west London ran out of grid headroom in 2022 and why the new zones deliberately point north.

Should water constrain where they are built?

Nobody can say with evidence, because nobody measures it. The Environment Agency admits the gap; the statutory planning system does not forecast data centre demand; and single requests as large as the needs of 147,000 people have reached one supplier. The honest answer is that the constraint is unquantified, which is not the same as absent.

Is the state catching up?

Partly. The first official electricity estimates arrived in June 2026 and ONS began national accounts work in August 2026. But there is still no register, no classification, no water measurement and no delivery tracking, for infrastructure the government itself designated critical in 2024.