The biggest data centres in the UK

Data centres are measured by power, not floor space: the megawatts (MW) of electricity the site is built to supply to its IT equipment. The largest UK project we track is Elsham Tech Park at 1,000 MW, which is not yet operating.

These tables use the capacity stated in each site's public sources. For sites still being planned or built, that is the planned figure, often for a whole multi-phase campus, and it can change or never be reached. Of the sites we track, 28 have a published capacity; the rest are left out rather than estimated. Each site page lists its sources.

Largest UK data centres, including those not yet built
Rank	Site	Operator	Capacity	Status
1	Elsham Tech ParkElsham WoldsApproved	Elsham Tech Park Ltd	1,000 MW	Approved
2	QTS Cambois Data Centre CampusCamboisApproved	QTS	720 MW	Approved
3	Cato (Auchtertool) Data CentreAuchtertoolPlanned	ILI Group	600 MW	Planned
4	Microsoft Newport Imperial ParkNewportApproved	Microsoft	200 MW	Approved
5	Colt DCS Hayes Digital Park CampusHayesUnder construction	Colt Data Centre Services	160 MW	Under construction
6	Vantage CWL1 Newport CampusNewportOperating	Vantage Data Centers	150 MW	Operating
7	VIRTUS Slough CampusSloughOperating	VIRTUS Data Centres	145.5 MW	Operating
8	DataVita DV4 ChapelhallChapelhallPlanned	DataVita	120 MW	Planned
9	Vantage CWL2 St Athan (Bro Tathan)St AthanApproved	Vantage Data Centers	120 MW	Approved
10	VIRTUS Stockley Park CampusWest DraytonOperating	VIRTUS Data Centres	112.5 MW	Operating
11	Culham AI Growth Zone Data CentreCulhamPlanned	UK Atomic Energy Authority	100 MW	Planned
12	Yondr London Campus (Slough)SloughOperating	Yondr	100 MW	Operating
13	Ark Union Park CampusHayesOperating	Ark Data Centres	99 MW	Operating
14	Pure DC London Brent Cross (LON01)LondonOperating	Pure DC	90 MW	Operating
15	Stellium Newcastle Campus (Cobalt Park)Newcastle upon TyneOperating	Stellium Datacenters	80 MW	Operating
16	Ark Cody Park CampusFarnboroughOperating	Ark Data Centres	51 MW	Operating
17	Nscale Loughton AI Data CentreLoughtonPlanned	Nscale	50 MW	Planned
18	Ark Spring Park CampusCorshamOperating	Ark Data Centres	46 MW	Operating
19	Kao Data Harlow CampusHarlowOperating	Kao Data	40 MW	Operating
20	Colt DCS London North (Welwyn)Welwyn Garden CityOperating	Colt Data Centre Services	40 MW	Operating

The biggest operating data centres

Largest UK data centres that are already operating
Rank	Site	Operator	Capacity	Status
1	Vantage CWL1 Newport CampusNewportOperating	Vantage Data Centers	150 MW	Operating
2	VIRTUS Slough CampusSloughOperating	VIRTUS Data Centres	145.5 MW	Operating
3	VIRTUS Stockley Park CampusWest DraytonOperating	VIRTUS Data Centres	112.5 MW	Operating
4	Yondr London Campus (Slough)SloughOperating	Yondr	100 MW	Operating
5	Ark Union Park CampusHayesOperating	Ark Data Centres	99 MW	Operating
6	Pure DC London Brent Cross (LON01)LondonOperating	Pure DC	90 MW	Operating
7	Stellium Newcastle Campus (Cobalt Park)Newcastle upon TyneOperating	Stellium Datacenters	80 MW	Operating
8	Ark Cody Park CampusFarnboroughOperating	Ark Data Centres	51 MW	Operating
9	Ark Spring Park CampusCorshamOperating	Ark Data Centres	46 MW	Operating
10	Kao Data Harlow CampusHarlowOperating	Kao Data	40 MW	Operating

Most of the largest figures belong to new builds, many inside the government's AI Growth Zones. See how many there are, the map, or the guide to data centre power use.

Spotted a figure that is out of date? Send a correction.