What changed in Data Centres on the map

29 projects changed: 27 reached a new stage, 21 milestones updated, 9 values revised, 3 statuses changed.

Data Centres · Hilfield Park, Elstree, Hertsmere, Hertfordshire

Ark Hilfield Park campus (Watford/Elstree)

Stage: Pre-application consultation; planning application in preparationwas: Pre-application consultation; approval targeted 2026
Next milestone: Planning application to Hertsmere Borough Councilwas: Planning submission / determination

Source: Watford/Elstree — developer/operator record · reported DatacenterDynamics →On the map →

Data Centres · Longcross Park, Chertsey, Surrey

Ark Longcross Park (LP02), Chertsey

Stage: Planning permission granted for next phase, including new 36MW LP02 buildingwas: Planning approved; pre-construction / build-out
Value: £807m (~$1bn) campus investmentwas: £807m (~$1bn)

Source: Ark Data Centres — developer record · reported DatacenterDynamics →On the map →

Data Centres · Spring Park, Corsham, Wiltshire

Ark Spring Park Extension, Corsham

Stage: Planning approved with conditions by Wiltshire Council (10 February)was: Planning approved with conditions (Feb 2026)

Source: Wiltshire Council — developer/operator record · reported DatacenterDynamics →On the map →

Data Centres · Cruiserath Road, Mulhuddart, Dublin 15

AWS Mulhuddart campus (three data centres)

Stage: Permission granted with revised conditions on appeal by An Coimisiún Pleanála (19 December 2025, case 318180); pre-constructionwas: Permission granted on appeal by An Coimisiún Pleanála (19 December 2025, case 318180); pre-construction
Next milestone: Construction startwas: Execute PPA; construction start

Source: An Coimisiún Pleanála →On the map →

Data Centres · Former Premier Periclase site, Drogheda, Co. Louth

CORE Sustainability Campus, Drogheda

Stage: Louth County Council application (ref 2460674) under third-party appeal by An Taisce, lodged 24 Jul 2025 (PL15.323134); no decision shown, due date of 26 Nov 2025 passedwas: Planning granted by Louth County Council (Jun 2025, ref 2460674); under third-party appeal to An Coimisiún Pleanála (An Taisce, lodged 24 Jul 2025), appeal undecided; 32MW phase 1
Value: Not disclosedwas: €600m-€1bn (10 years)
Next milestone: An Coimisiún Pleanála appeal decisionwas: Planning determination

Source: An Coimisiún Pleanála - Case PL15.323134 →On the map →

Data Centres · Culham Science Centre, near Abingdon, Oxfordshire

Culham AI Growth Zone

Stage: Announced as first AI Growth Zone (Jan 2025); private-sector partner still being sought (Mar 2026)was: Designated (Apr 2025); Strategic Investment Partner procurement underway
Next milestone: Agreement of public-private partnership with a private-sector partnerwas: Selection of Strategic Investment Partner

Source: South Oxfordshire and Vale - Statement of Common Ground for Culham Campus (LPA59 AS11) →On the map →

Data Centres · Avoca River Business Park (former IFI site), Arklow, Co. Wicklow

Echelon DUB20 Green Energy Park, Arklow

Stage: Under construction (reported 26 March 2026)was: Under construction
Next milestone: Completion (due by 2028)was: Completion (~2028)

Source: Echelon — developer/operator record · reported RTÉ →On the map →

Data Centres · Kilmeaden, near Waterford city, Co. Waterford

Echelon Kilmeaden campus, Waterford

Stage: Planning permission sought (September 2025); more than 300 objectionswas: Planning submitted (Oct 2025)

Source: Echelon — developer/operator record · reported TheJournal.ie →On the map →

Data Centres · Ballymakaily, Lucan, Co. Dublin

EdgeConneX Lucan (Ballymakaily, two buildings)

Stage: Planning granted on appeal by An Coimisiún Pleanála, overturning South Dublin County Council's refusal; pre-constructionwas: Planning granted on appeal (Aug 2025); pre-construction
Next milestone: Construction start; corporate renewable PPA required before operationwas: Construction start

Source: Ballymakaily, two buildings — developer/operator record · reported TheJournal.ie →On the map →

Data Centres · Ennis, Co. Clare, Ireland

Ennis campus (Art Data Centres)

Stage: Works set to commence after the High Court found in the developer's favour in judicial review proceedings (March 2026)was: Build starting (judicial review dismissed March 2026; leave to appeal refused June 2026)

Source: RTÉ (Mar 2026) / Irish Times (Jun 2026) →On the map →

Data Centres · Blanchardstown, Dublin 15

Equinix DB7x, Blanchardstown

Stage: Construction began (announced 20 March 2026)was: Under construction (from Mar 2026)
Next milestone: Retail capacity available from early 2028was: Availability (early 2028)

Source: Equinix press release (20 March 2026) →On the map →

Data Centres · South Mimms, Hertsmere, Hertfordshire

Equinix DC01UK / Hertfordshire Campus, South Mimms

Stage: 85-acre site acquired, permitted for data centre development (Oct 2025)was: Outline planning permission granted (January 2025); pre-construction
Next milestone: Construction startwas: Detailed planning approvals and groundbreaking. No construction start date has been published.

Source: Equinix press release (30 October 2025) · Hertsmere Borough Council →On the map →

Data Centres · Nutmeg Lane, Poplar, Tower Hamlets, East London

Global Switch London South, Docklands

Status: Pipelinewas: At tender
Stage: Planning approved; Global Switch says London South 'is being developed'; no construction or completion date publishedwas: Planning approved (Feb 2024); pre-construction — no evidence of site works; completion targeted ~2027
Next milestone: Construction start (date not published)was: Completion (~2027)

Source: Global Switch - London data centres →On the map →

Data Centres · South Dublin, Ireland

Grange Castle Phase 3 (Google)

Next milestone: Construction start (no date published)was: Grid connection and start of construction; no dates published

Source: An Coimisiún Pleanála case 320852 →On the map →

Data Centres · Former RAF Elsham Wolds, near Brigg, North Lincolnshire

Greystoke Elsham Tech Park, North Lincolnshire

Stage: Planning approved by North Lincolnshire councillors (reported Mar 2026); construction expected from 2027, first phase to open 2029was: Planning approved Mar 2026; construction planned to begin 2027, open 2029; no judicial review surfaced
Value: Up to £10bnwas: £7.5-10bn

Source: Data Centre Review - North Lincolnshire approves plans for major AI data centre campus →On the map →

Data Centres · Peel Waters / TraffordCity, Salford, Greater Manchester

Halo West data centre, Peel Waters, Salford

Stage: Unanimous approval by Salford City Council planning committee (reported 7 March 2025); pre-constructionwas: Planning approved (Feb 2025); pre-construction

Source: Peel Waters →On the map →

Data Centres · Naas Enterprise Park, Naas, Co. Kildare

Herbata 'grid-free' data campus, Naas

Stage: Under appeal to An Coimisiún Pleanála (first and third party appeals lodged 16 September 2025); decision not yet madewas: Planning granted (Aug 2025); under appeal
Value: Not disclosedwas: €3bn
Next milestone: An Coimisiún Pleanála decision, originally due by 28 January 2026was: An Coimisiún Pleanála decision on appeals lodged September 2025, originally due by 28 January 2026

Source: An Coimisiún Pleanála, RTÉ →On the map →

Data Centres · Kao Data campus, Harlow, Essex

Kao Data Harlow campus expansion (KLON-03/04)

Status: Pipelinewas: Live
Stage: KLON-03 (17.6MW) announced Mar 2025; two further buildings planned (Sep 2025); Nebius 22MW ten-year lease signedwas: KLON-03 under construction; further phases in planning
Value: Not disclosedwas: £1.7bn (Nebius UK deployment)
Next milestone: Construction of KLON-03 and planning for further buildingswas: KLON-03 energisation; KLON-04 consent

Source: Kao Data — developer/operator record · reported DatacenterDynamics →On the map →

Data Centres · Bidder Street, Canning Town, Newham, East London

L&G / Goldacre hyperscale data centre, Canning Town

Stage: Planning permission granted by LB Newham councillors; pre-constructionwas: Planning granted (Oct 2024); pre-construction
Next milestone: Construction; could be operational by 2027was: Construction; operational ~2027

Source: Legal & General / Goldacre — developer record (LB Newham consent) · reported DatacenterDynamics →On the map →

Data Centres · Rover Way, Cardiff, South Wales

Latos Cardiff (Rover Way)

Next milestone: Start of development work, expected immediately; no delivery timeline publishedwas: Start of development, no delivery timeline published

Source: Rover Way — developer/operator record · reported DatacenterDynamics →On the map →

Data Centres · Little Island, Cork Harbour, Co. Cork

Little Island data centre (former Mitsui Denman site), Cork

Stage: Building 1 fully constructed, fit-out outstanding (Mar 2025); grid connection agreement issued 18 Jul 2024; permission extended to 2027was: Building 1 shell complete — awaiting grid connection/fit-out; permission extended to 2027
Next milestone: Fit-out of building 1; second buildingwas: Fit-out; second building

Source: Irish Examiner - Little Island data centre permission extension →On the map →

Data Centres · Skelton Grange, Stourton, Leeds, West Yorkshire

Microsoft data campus, Skelton Grange, Leeds

Stage: Hybrid planning unanimously approved by Leeds City Council (Apr 2026); pre-constructionwas: Planning approved Apr 2026; construction now expected to begin early 2027
Value: £4bn (reported)was: £4bn
Next milestone: Construction start, likely within 12 to 18 months of approvalwas: Construction start

Source: Construction Enquirer - Go-ahead for Microsoft's £4bn Leeds data hub push →On the map →

Data Centres · Trawsfynydd, Gwynedd (former nuclear power station) with a second base at Prosperity Parc, Anglesey, North Wales

North Wales AI Growth Zone (Trawsfynydd / Anglesey)

Stage: Announced (13 Nov 2025); securing investment partnerwas: Designated (Nov 2025); securing investment partner
Value: Not disclosedwas: Up to £100bn (programme-wide AIGZ figure)
Next milestone: Confirmation of investment partner, then construction startwas: Confirmation of investment partner / construction start

Source: GOV.UK (DSIT) →On the map →

Data Centres · Brent Cross Town, Barnet, North London

Pure DC Brent Cross campus (LON1)

Stage: Live operational campus; 70MW LON01B2 final build phase under way, Glencar piling West Shell (Sep 2026)was: Building 1 operating; Building 2 under construction
Next milestone: LON01B2 completion (Q2 2029)was: Phase completion (~2029)

Source: Pure DC - Pure DC begins final build phase of its 90MW LON01 Brent Cross campus →On the map →

Data Centres · Cambois, near Blyth, Northumberland

QTS Cambois campus (Blackstone)

Status: Livewas: At tender
Stage: First phase (first two of up to ten buildings) approved by Strategic Planning Committee; enabling works well under way (December 2025)was: Consented; Phase 1 reserved matters approved, enabling works
Value: £10bnwas: Up to £10bn (Northumberland County Council)
Next milestone: Construction of the first data centre buildingswas: Construction of the first data centre building during 2026

Source: Northumberland County Council →On the map →

Data Centres · Rochfortbridge, Co. Westmeath

Red Admiral data campus, Rochfortbridge

Stage: Westmeath County Council application (ref 2560344) under third-party appeal to An Coimisiún Pleanála (PL25M.501550), lodged 17 Jun 2026; no decision shownwas: Granted 3 Jun 2026; stalled — 10 third-party appeals lodged with An Coimisiun Pleanala (one ruled invalid); decision awaited
Value: Not disclosedwas: €1bn

Source: An Coimisiún Pleanála - Case PL25M.501550 →On the map →

Data Centres · Slough Trading Estate, Slough, Berkshire

SEGRO Slough Trading Estate data centre

Stage: Pre-let signed in H1 2026 for a multistorey powered shell data centre; Slough Simplified Planning Zone pre-approves data centre developmentwas: Pre-let signed March 2026; consented under the estate's Simplified Planning Zone
Next milestone: Delivery in two phases as power becomes available; no completion date publishedwas: No completion date published as of October 2026

Source: SEGRO results for the six months to 30 June 2026 →On the map →