Data centres / United Kingdom / London
Data centre projects in London
Pipeline projects3723 permitted or being builtChecked 11 Oct 2026
New grid connectionsPausedpaused to new connection applications, in force since 30 Jun 2025. United Kingdom-wide, transmissionChecked 12 Oct 2026
Wholesale power price94 €/MWhDay-ahead, 2025 mean, United KingdomLatest hour €199, 12 Oct 2026, 18:59 UTC
Grid carbon intensity136 g CO2e/kWhLatest hour, estimate; yearly average 21712 Oct 2026, 18:59 UTC
Latency to nearest major hub3.4 msRound trip, London to ParisStraight line, minimum
These are the data-centre projects of 5 MW or more around London that our pipeline tracker follows: 37 projects, 23 of them permitted or already being built. Of these, 4 are under construction, and 4 are still at the announcement stage.
Largest stated project300 MWEbbsfleet AI Data Centre Campus, campus capacity as reported; basis not stated
Newest milestoneSep 2026latest check 11 Oct 2026
Projects by stage
- Announced4
- In planning10
- Permitted18
- Contractor appointed1
- Under construction4
What the capacity figures measure
- IT load10
- Facility, campus or unstated basis17
- No capacity published10
Each project’s capacity is quoted on its own stated basis, so the figures are never added together.
What changed
11 milestones in the last 90 days. The newest check was on 11 Oct 2026; each row below shows its own.
- Sep 2026Pure DC LON01, Brent Cross piling started on LON01B2, the campus's final build phase Under construction
- Sep 2026Microsoft Langley datacentre site with outline datacentre permission being cleared; community information sessions held July and September 2026 Permitted
- Sep 2026Thames Valley Park data centre outline application (ref 262274) validated by Wokingham Borough Council; consultation to 29 October 2026 In planning
- Aug 2026Heathrow Estate data centre approved by Hounslow Council Permitted
- Aug 2026Charlton Riverside data centre request filed with the Royal Borough of Greenwich asking whether a full Environmental Impact Assessment is needed; full application expected later In planning
Projects
| Project | Capacity | Stage and latest milestone | Checked |
|---|---|---|---|
| Ada Infrastructure Docklands campusAda Infrastructure (GLP Capital Partners)Royal Docks, London Borough of Newham | 210 MWcampus, three 70 MW buildings | Under construction Construction of the first of three 70 MW buildings began, Mar 2026 | 11 Oct 2026 |
| Pure DC LON01, Brent CrossPure DCBrent Cross, north London | 90 MWcampus totalFinal building LON01B2 is 70 MW | Under construction Piling started on LON01B2, the campus's final build phase, Sep 2026Expected: Q2 2029 | 10 Oct 2026 |
| Telehouse West TwoTelehouse (KDDI)Telehouse London Docklands campus | 33 MWoverall building capacity | Under construction Ground broken on the nine-storey building, Oct 2025Expected: set for completion in 2028 | 10 Oct 2026 |
| Kao Data KLON-03Kao DataKao Data Harlow campus, Harlow | 18 MWcapacity of the new data centre (developer)A June 2026 customer agreement is stated as 22MW at the Harlow campus, to be hosted in KLON-03; the developer states the new data centre as 17.6MW | Under construction Construction of KLON-03 announced (March 2025); a 10-year, 22MW customer agreement for the Harlow campus announced in June 2026, Jun 2026Expected: Ready for service in 2026 (developer, stated in March 2025 as "next year") | 11 Oct 2026 |
| Corscale Court Lane data centre campusCorscaleCourt Lane, Iver, Buckinghamshire | 140 MWcampus capacity across two buildings, as reported by the contractor and reportsDedicated 140MVA substation; Corscale's own website lists the Court Lane campus at 103 MW power capacity | Contractor appointed McLaren Construction appointed with Phoenix ME under a pre-construction services agreement; predevelopment enabling works scheduled from 1 July 2026, Jun 2026Expected: Once complete in late 2029 | 10 Oct 2026 |
| Equinix Hertfordshire campusEquinixSouth Mimms, Hertsmere (85-acre site) | 250 MWcompute capacity (250+ MW) | Permitted Site acquired; plot permitted for data-centre development, Oct 2025 | 10 Oct 2026 |
| Google North Weald Airfield data centreGoogleNorth Weald Airfield, Epping Forest District, Essex | 163 MWestimated power requirement of the siteSource text reads "163MWW", read as MW | Permitted Outline planning application approved by Epping Forest District Council planning committee, Dec 2025 | 10 Oct 2026 |
| Manor Farm data centreTritax Big Box REIT (Manor Farm Propco Limited)Land at Manor Farm and land north of Wraysbury Reservoir, Poyle Road, Slough | 107 MWfacility capacity as stated by the developer; measure not defined | Permitted Planning consent secured after the six-week judicial review concluded; pre-let agreement in solicitors' hands, Jul 2026 | 10 Oct 2026 |
| Colt DCS Hayes Digital Park, London 6 to 8Colt DCSHayes, London Borough of Hillingdon | 97 MWIT capacity, three new buildingsCampus total 160 MW after expansion | Permitted Approved by Hillingdon Council, Nov 2025Expected: Construction from mid-2026, first building early 2029 | 10 Oct 2026 |
| Abbots Langley hyperscale data centreGreystoke LandLand off Bedmond Road, Abbots Langley, Three Rivers, Hertfordshire | 96 MWdevelopment capacity as reported84,000 sq m hyperscale campus | Permitted Planning permission granted on appeal by the Secretary of State, overturning Three Rivers District Council's refusal, May 2025 | 10 Oct 2026 |
| Virtus Saunderton campusVirtus Data CentresSaunderton, near High Wycombe, Buckinghamshire | 78 MWIT load across four data centresA February 2024 report gave 75 MW for the four data centres and a National Grid contract for 120 MVA | Permitted Campus plan announced on an approved planning site, with building works due to start Q4 2024, Feb 2024Expected: ready for service by the second quarter of 2026 (as stated in February 2024) | 10 Oct 2026 |
| Premier Park data centrePure Data Centres and SEGRO (joint venture)Park Royal, west London | 72 MWpower capacity | Permitted Planning permission issued on 3 July 2026 after the S106 agreement was completed (committee resolved to grant on 26 February 2026), Jul 2026Expected: Construction expected to start in 2026 | 11 Oct 2026 |
| Nscale Loughton AI data centreNscaleLoughton, Epping Forest District, Essex | 50 MWAI compute capacityExpandable to 90MW; one report cites a revised proposal 50% larger than originally proposed, with no MW figure given | Permitted Outline approval granted in 2024; after Nscale revised the plans, Loughton Town Council planning officers asked for a new planning application, with Epping Forest District Council holding the decision, Mar 2026Expected: construction start in Q2 2026 and operation in Q2 2027 (Nscale spokesperson, March 2026) | 10 Oct 2026 |
| Heathrow Estate data centreBrixton (Heathrow Estate) Ltd; operator not yet namedCranford, London Borough of Hounslow | 48 MWIT load (64 MW power requirement)Up to three buildings; a future operator brings the detailed scheme through reserved matters | Permitted Approved by Hounslow Council, Aug 2026 | 10 Oct 2026 |
| Global Switch London South data centreGlobal SwitchDocklands, London (Global Switch London campus) | 40 MWIT power capacityCampus utility supply of 126MVA is quoted separately by the developer | Permitted Full planning approval received for a new five-floor, 27,000 sq m building, Feb 2024 | 11 Oct 2026 |
| Ark Longcross Park LP02Ark Data CentresLongcross Park, Runnymede, Surrey | 36 MWnew LP02 data centre buildingApproval also covers vertical extensions to existing buildings; row covers the LP02 expansion only | Permitted Planning approval for LP02 and expansion of existing buildings, with a GBP 807 million investment announced, Jun 2026 | 10 Oct 2026 |
| Foxboro Business Park data centreCastleforge and Galaxy Data Centers (joint venture)Foxboro Business Park, Redhill, Reigate and Banstead, Surrey | 15 MWdata centre capacity | Permitted Full planning consent granted by Reigate and Banstead Borough Council planning committee, May 2026 | 10 Oct 2026 |
| 45 Maylands Avenue data centreNorthtree Investment Management45 Maylands Avenue, Hemel Hempstead, Dacorum, Hertfordshire | 5 MWper data hall (two halls planned)Up to 5,100 sqm | Permitted Outline planning permission granted for redevelopment of a self storage site into a data centre, Aug 2025 | 10 Oct 2026 |
| Caineal Wickford AI data centreCainealNear the A127 and Old Nevendon Road, Wickford, Basildon, Essex | Not disclosedReported investment GBP 1.3bn | Permitted Planning approval by Basildon Council Planning Committee; construction to start once final formalities are completed, Sep 2025 | 10 Oct 2026 |
| CyrusOne Southall campus (former Honey Monster factory)CyrusOneBridge Road, Southall, London Borough of Ealing | Not disclosedMore than 52,000 sqm of floorspace across four storeys | Permitted Approved by Ealing Council planning committee on 17 July 2026, Jul 2026Expected: Works could start at the beginning of 2027; campus opening hoped for by 2030 | 10 Oct 2026 |
| Equinix Wexham Road campus (former AkzoNobel paint factory)EquinixOff Wexham Road, Slough | Not disclosedThree buildings; a detailed application is still required | Permitted Outline planning permission for a three building data centre campus approved by Slough Borough Council planning committee, Nov 2025 | 10 Oct 2026 |
| Microsoft Langley datacentreMicrosoftLangley, Slough | Not disclosedSite received outline planning permission for a datacentre in 2020 | Permitted Site with outline datacentre permission being cleared; community information sessions held July and September 2026, Sep 2026 | 10 Oct 2026 |
| SEGRO Slough Trading Estate powered shell data centreSEGROSlough Trading Estate, Slough | Not disclosedSource gives 50MVA of power when fully operational (MVA, not MW) | Permitted Pre-let agreed with an existing customer for a 30,000 sq m powered shell; planning in place via the Simplified Planning Zone, Mar 2026 | 10 Oct 2026 |
| Ebbsfleet AI Data Centre CampusClearstone (applicant CSE52 Limited)Land adjacent to New Barn Road, Dartford, Kent | 300 MWcampus capacity as reported; basis not statedPower to come through a National Grid transmission connection | In planning Section 35 direction issued so the campus is treated as a Nationally Significant Infrastructure Project requiring a Development Consent Order, Jul 2026Expected: targeting an operational start date of 2030 | 10 Oct 2026 |
| SDC M40 CampusSlough Holdings UK LimitedBetween the A40 Oxford Road and the M40, about 2km west of Gerrards Cross, Buckinghamshire (Planning Inspectorate project EN0110030) | 300 MWIT load across three buildings (c.100MW each)On-site energy centre maximum generating capacity approximately 250 to 350MW | In planning Planning Inspectorate published a Scoping Opinion; project at pre-application stage of the Development Consent Order process, Jun 2026Expected: The application is expected to be submitted January 2027 | 10 Oct 2026 |
| Charlton Riverside data centreGreater London Industrial (GLi), joint venture of Patrizia and Kingston Space PropertyLand off Anchor and Hope Lane, Charlton Riverside, Royal Borough of Greenwich | 180 MWdevelopment total as reportedOne report gives 100,000 sqm for the centre | In planning Request filed with the Royal Borough of Greenwich asking whether a full Environmental Impact Assessment is needed; full application expected later, Aug 2026Expected: Work could start in 2028 and be finished by 2033 | 10 Oct 2026 |
| Project Blackwater data centre campusTritax Big Box REITBeaulieu Parkway, Beaulieu Park, Chelmsford, Essex | 125 MWcampus total as reportedSame source says each of the two buildings would offer 44MW; figures not reconciled in the source | In planning Planning application for a two-building campus submitted; Tritax Management appointed to provide development management and technical services, Jun 2026 | 10 Oct 2026 |
| Thames Valley Park data centreFH Trustees Limited and FH Trustees 2 Limited (Mapeley Beta HL Unit Trust)Thames Valley Park, Earley, Wokingham Borough, Berkshire | 72 MWIT capacityPeak demand about 110MW; application documents give 49.9MW and 42.5MW for the initial fuel cell supply | In planning Outline application (ref 262274) validated by Wokingham Borough Council; consultation to 29 October 2026, Sep 2026Expected: demolition April to October 2027; main construction February 2028 to August 2031 (per application documents) | 10 Oct 2026 |
| Bromley green belt data centreDare DCBetween Cudham Lane North and Charmwood Lane, London Borough of Bromley | 50 MWdata centre capacity as reportedTwo-building campus on a ten-hectare site | In planning EIA screening opinion request submitted to Bromley Council; no full planning application yet, Jul 2026Expected: grid connection hoped for 2028 | 10 Oct 2026 |
| Amazon tape data centre, Hemel HempsteadAmazonHemel Hempstead, Dacorum, Hertfordshire | Not disclosedEstimated footprint of 1,935 sqm | In planning Planning application lodged with Dacorum Borough Council, Feb 2026Expected: decision likely later in 2026 | 10 Oct 2026 |
| Arena Essex data centre campusApplicant not named in the council noticeArena Essex and Fishing Lake, Arterial Road, Purfleet-on-Thames, Thurrock | Not disclosedOutline element covers up to four data centre buildings with a total GEA of up to 130,500 sqm | In planning Hybrid planning application 25/00573/OUT advertised by Thurrock Council, Jul 2025 | 10 Oct 2026 |
| Denham data centre campusMulberry Commercial Developments IILand either side of Denham Court Drive, Denham, Buckinghamshire | Not disclosed60,000 sqm (645,835 sq ft) | In planning Planning application submitted to Buckinghamshire Council on 1 June 2026; Denham Parish Council objected and asked for a call-in to committee, Jun 2026 | 10 Oct 2026 |
| East Havering Data Centre CampusDigital ReefNorth Ockendon, London Borough of Havering | Not disclosedOne report cites a 600MVA connection via the Warley substation | In planning Formal consultation on the East Havering Datacentre Local Development Order closed; revised plan reported as due in autumn 2026, Apr 2026 | 10 Oct 2026 |
| Ark Elstree campus (former Mercure Hotel)Ark Data CentresFormer Mercure Hotel site, Watford (Ark's Elstree campus), Hertsmere Borough, Hertfordshire | 200 MWsite capacity as reportedUp to six data centre buildings reported | Announced Public consultation launched ahead of a planning application to Hertsmere Borough Council, Nov 2025Expected: Construction could start in 2026, with the first building launching in 2029 | 10 Oct 2026 |
| CyrusOne LON6CyrusOneIver Heath, Buckinghamshire | 90 MWIT capacity | Announced Plans announced for a new campus; groundbreaking targeted for Q3 2026, Jun 2025Expected: Groundbreaking Q3 2026; first capacity early 2028 | 10 Oct 2026 |
| VIRTUS LONDON19Virtus Data CentresSlough Trading Estate, Slough | 33 MWIT load | Announced Development of LONDON19 announced on the Slough campus, Jul 2026 | 10 Oct 2026 |
| Kao Data Park Royal campusKao DataFormer Frogmore Industrial Estate, Park Royal, west London | Not disclosed4.7-acre site | Announced Site acquired; planning proposals to be submitted over the coming months, May 2026Expected: ready for service in 2029 | 10 Oct 2026 |
Formal refusals and bans since 2025
Verified decisions only. Absence is not evidence of low planning risk.
No formal refusal or ban recorded for London in this register. The register covers decisions we have verified, not every decision taken.
Decisions from 1 Jan 2025; statuses checked 11 Oct 2026.
Power and grid in the United Kingdom
The latest hour, GB bidding zone
Grid carbon intensity (estimate)136 g CO2e/kWh
Day-ahead price199 €/MWhwholesale, not what a site pays
Renewable share of generation55 %
Best four hours for flexible load12:00Tue 13 Oct to 16:00, local time
Updated 12 Oct 2026, 18:59 UTC; refreshed every 10 minutes. United Kingdom grid hour by hour, next 48 hours
Over a year, country level
Grid carbon, latest full-year average217 g CO2/kWh17th cleanest of 30 countries; 64% renewable or nuclear
Wholesale power, 2025 average94 €/MWh14th cheapest of 30
Annual country averages, as used by the siting cost ranking. Production-based average carbon, not marginal.
Climate at London
Hours a year above 27 °C dry-bulb61 hmean of 2016 to 2025
Hours a year above 32 °C dry-bulb4 hworst year 17 h
Hours a year above 20 °C wet-bulb45 hlimit for evaporative cooling
Hourly climate reanalysis at the city’s grid cell, from the market comparison; a site’s own conditions differ.
Fibre latency from London
| To | Round trip, minimum | Path length | Path |
|---|---|---|---|
| Brussels | 3.1 ms | 321 km | Straight line (no mapped land route) |
| Paris | 3.4 ms | 344 km | Straight line (no mapped land route) |
| Amsterdam | 3.5 ms | 356 km | Straight line (no mapped land route) |
| Dublin | 4.5 ms | 463 km | Straight line (no mapped land route) |
| Frankfurt | 6.2 ms | 638 km | Straight line (no mapped land route) |
| Zurich | 7.6 ms | 776 km | Straight line (no mapped land route) |
| Munich | 9.0 ms | 918 km | Straight line (no mapped land route) |
Light in single-mode fibre between city centres, over the mapped land fibre route where one exists, otherwise the straight line. Operator routes, equipment and the last kilometres add to these floors. Any pair in the latency calculator
Method
The pipeline covers data-centre projects of 5 MW or more, or with no capacity published, that are announced, in planning, permitted or under construction and not yet fully operating. It is not a list of operating facilities. A metro market follows the tracker’s own market field, so it includes the region around the city; a country page covers every tracked project in the country.
- Projects: each row is the latest public milestone we found for the project, with the date it was last checked; the pipeline tracker holds every project.
- Latest hour: carbon intensity estimated from the hourly generation mix, with the day-ahead price, refreshed every 10 minutes on the live grid page.
- Over a year: national averages for the latest full year, the same figures the siting cost ranking uses.
- Climate: hourly reanalysis at the city’s grid cell, 2016 to 2025.
- Latency: light in fibre between city centres over the mapped land route, otherwise the straight line.
Cite as: ScienceShot, “Data centre projects around London”, https://scienceshot.com/data-centres/london/ (checked 11 Oct 2026). © ScienceShot. You may quote individual facts with a link to this page.
ScienceShot dataset, checked 12 Oct 2026. How we build it: Method and standards.