StackPath Ireland

Count · campuses, buildings, listings

How many data centres are there in Ireland?

Ireland has 55 operating data-centre campuses, out of 79 known sites at any stage: 7 under construction, 6 permitted, 3 proposed and 8 lapsed (StackPath directory of planning, EPA, valuation and OpenStreetMap records, Oct 2026). Other counts of 82 to 149 list individual buildings or colocation listings, not campuses.

Updated 10 October 2026 · data build 2026-10-10 · how we know · corrections

Why every count is different

Figure 1

Why every count of Irish data centres is different

Records are not data centres. 156 planning files, 93 mapped buildings, 66 rated properties and 29 EPA licences collapse into 79 campuses, 55 of them operating.

From public records to campusesPlanning applications: 156; Mapped buildings: 93; Rated properties: 66; EPA generator licences: 29. Joined into 79 campuses, of which 55 operating, 7 under construction, 6 permitted, 3 proposed, 8 lapsed.RECORDS (WHAT OTHERS COUNT)JOINED INTOSTATUS, STRONGEST EVIDENCEPlanning applications: 156 (as of 10 Oct 2026)156Planning applicationsevery file that mentions a data centre, incl. amendmentsMapped buildings: 93 (as of 10 Oct 2026)93Mapped buildingsOpenStreetMap outlines: one per buildingRated properties: 66 (as of 3 Oct 2026)66Rated propertiesvaluation-list entries coded 'data centre'EPA generator licences: 29 (as of 3 Oct 2026)29EPA generator licencessites with ≥50 MW thermal of on-site plant79campusesany stagesame operator within 600 m= one campusOperating: 55 campuses55 operatingUnder construction: 7 campuses7 under constructionPermitted, not started: 6 campuses6 permitted, not startedProposed: 3 campuses3 proposedLapsed: 8 campuses8 lapsed
From public records to campusesPlanning applications: 156; Mapped buildings: 93; Rated properties: 66; EPA generator licences: 29. Joined into 79 campuses, of which 55 operating, 7 under construction, 6 permitted, 3 proposed, 8 lapsed.RECORDS (WHAT OTHERS COUNT)Planning applications156every file that mentions a data centre, incl. amen…Mapped buildings93OpenStreetMap outlines: one per buildingRated properties66valuation-list entries coded 'data centre'EPA generator licences29sites with ≥50 MW thermal of on-site plant79campuses, any stagesame operator within 600 m = oneSTATUS, STRONGEST EVIDENCE55 operating7 under construction6 permitted, not started3 proposed8 lapsed

Each published count of Irish data centres counts a different thing. A planning file can be an amendment, a building is one of several on a campus, and an EPA licence only exists where on-site generators exceed 50 MW thermal. StackPath joins all four kinds of record by location and operator into 79 campuses (10 Oct 2026), then gives each campus one status from its strongest evidence: 55 operating, 7 under construction, 6 permitted, 3 proposed, 8 lapsed. Directory sites such as datacentermap list individual buildings and small server rooms, which is why their totals run higher.

Sources: Council planning registers via planningregister, 10 Oct 2026 · OpenStreetMap contributors (ODbL), 10 Oct 2026 · Tailte Éireann valuation list, 3 Oct 2026 · EPA LEAP licences, 3 Oct 2026 · StackPath directory, 10 Oct 2026

Figure 2

One campus, many records

Count buildings and Microsoft Grange Castle is 12 data centres; count EPA licences and it is 3; count planning files and it is 26. We count it as one campus.

Microsoft Grange Castle: one campus, many recordsMicrosoft Grange Castle: 12 mapped buildings, 9 rated properties, 26 planning files, 3 epa licences, 1 appeals, all joined into one campus. It drew 154.5 MW on average in 2025.ONE CAMPUS · SOUTH DUBLINMicrosoft Grange CastleMicrosoft DSFMicrosoft DUB03 / DUB04Microsoft DUB05Microsoft DUB06Microsoft DUB07Microsoft DUB08Microsoft DUB09Microsoft DUB10Microsoft DUB12Microsoft DUB13Microsoft DUB14Microsoft DUB1512 buildings · 19.5 ha of roof · 154.5 MW average draw, 202512Mapped buildingsOpenStreetMap9Rated propertiesvaluation list26Planning files9 found only by our model3EPA licencesgenerator fleets1AppealsAn Coimisiún Pleanála
Microsoft Grange Castle: one campus, many recordsMicrosoft Grange Castle: 12 mapped buildings, 9 rated properties, 26 planning files, 3 epa licences, 1 appeals, all joined into one campus. It drew 154.5 MW on average in 2025.Microsoft Grange CastleONE CAMPUS · SOUTH DUBLIN12 buildings · 154.5 MW avg, 202512Mapped buildings9Rated properties26Planning files3EPA licences1Appeals

Microsoft Grange Castle in South Dublin is the campus with the most public records joined to it. OpenStreetMap shows 12 separate buildings, the valuation list rates 9 properties, 3 EPA licences cover its generator fleets, and 26 planning files describe its halls, extensions and amendments (9 of them found only by our planning-register model because their descriptions never say "data centre"). Every one of those is a legitimate thing to count, which is why published totals for Ireland range so widely. A campus is the unit that matches how operators build and how the grid connects them.

Sources: StackPath directory, 10 Oct 2026 · OpenStreetMap contributors (ODbL), 10 Oct 2026 · EPA LEAP, 3 Oct 2026 · Tailte Éireann valuation list, 3 Oct 2026 · Council planning registers, 10 Oct 2026

The short answer: about 55 operating data-centre campuses, out of 79 known sites at any stage. Other counts (82 to 149) differ because they count individual buildings, small server rooms or planned sites, not campuses.
SourceCountWhat it countsAs of
This site: campuses79Sites joined across six sources, any status2026-10-10
This site: operating campuses55Campuses with evidence of operation (EPA, valuation, completion certificates, OSM)2026-10-10
OpenStreetMap buildings93Mapped buildings and sites, not campuses2026-10-10
Valuation list properties66Rateable properties coded 'data centre' (Cork not included)2026-10-03
EPA generator licences29Sites with ≥50 MWth of on-site plant, any status2026-10-03
Planning applications156Applications mentioning a data centre since 2007, incl. amendments2026-10-10
datacentermap.com129Facilities listed (buildings, incl. small colocation and telecom halls)Oct 2026
Baxtel149Facilities incl. planned, with codenamesOct 2026
datacenters.com82Colocation provider listingsOct 2026
Bitpower (Q4 2024)9264 large campuses-or-buildings + 19 small + 9 standaloneQ4 2024

Competitor counts as displayed on their sites on 3 Oct 2026, not verified.

Operating campuses by council

South Dublin15
Fingal12
Dublin City9
Unknown4
Dublin City (nearest record)4
South Dublin (nearest record)3
Meath2
Kildare2
Fingal (nearest record)1
Clare1
Louth1
Limerick1

StackPath directory, 2026-10-10. See every campus on the map.

Questions people ask

How many data centres are in Dublin?
44 of the 55 operating campuses are in the four Dublin council areas (StackPath directory, Oct 2026).
How many Amazon data centres are in Ireland?
Our directory lists 9 Amazon (AWS) campuses at any stage, 9 of them operating (Oct 2026).

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