Every data centre in Ireland
79 campuses (55 operating), 156 planning applications, the operators and the inspectors' findings.
Every data centre in Ireland
One record per campus, joined from every public source: what's operating, being built, permitted or proposed, and how much power each draws.
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 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
Grid draw by operator, 2025 (MW average)
Only sites with an EPA generator licence report grid use, so these are floors. Circle size on the map = grid MW.
One record per campus, joining OpenStreetMap, planning, appeals, EPA licences and reports, the valuation list and Building Control. Operators are never guessed: 23 campuses stay "operator not identified". 24 operating sites have no planning record described as a data centre.
Operators
Who runs Ireland's data centres, ranked by measured grid draw. Click one for its profile.
Every application
Search by company, place or reference. Tags show what the description mentions: gas, batteries, generators, substations.
From permission to power-on
How long data centres take to get through planning and get built, how many permissions never turn into buildings, and how that changed after 2021.
How long each step takes (median months)
Once granted, projects start in about 6 months and finish about 18 months later. The delay has moved into planning and appeals.
Before and after the CRU direction (Nov 2021)
| Before | After | |
|---|---|---|
| New-build applications | 69 | 16 |
| Median lodged → council decision | 2 mo | 4.5 mo |
| Further information requested | 43% | 69% |
| Appealed | 13% | 69% |
| Refused | 3% | 25% |
| Median appeal length | 10.5 mo | 23.5 mo |
New-build applications lodged before and after 23 Nov 2021. The "after" group is small and still filling in: read the direction, not the decimals.
Permitted but not built
| Site | Operator | Council | m² | Status | Expiry |
|---|---|---|---|---|---|
| Equinix Profile Park (DB8) SD21A/0186 | Equinix | SDCC | 9,601 | unstarted, expires within 12 months | 2027-05-05 |
| Hoffmann Park, Little Island 21/5574 | — | CORKCO | — | unstarted, expires within 12 months | 2027-07-08 |
| Parslickstown, Mulhuddart FW21A/0046 | — | FINGAL | — | unstarted, permission live | 2027-12-05 |
| Wallingstown, Little Island 17/6980 | — | CORKCO | — | unstarted, permission live | 2028-02-26 |
| Avoca River Park, Arklow 2372 | Echelon (Crag Digital Avoca) | WICKLOW | 48,618 | unstarted, permission live | 2028-07-24 |
| Tulla Road, Ennis 21757 | — | CLARE | 118,740 | unstarted, permission live | 2029-04-14 |
| EdgeConneX Ballymakaily SD22A/0333 | EdgeConneX | SDCC | 15,274 | unstarted, permission live | 2030-07-31 |
| Avoca River Park, Arklow 2560594 | Echelon (Crag Digital Avoca) | WICKLOW | 45,511 | unstarted, permission live | 2031-06-01 |
| Pure DC Orion Park FW26A/0021E | Pure DC | FINGAL | — | unstarted, permission live | 2031-07-24 |
| Google Grange Castle SD24A/0164W | SDCC | 38,115 | unstarted, permission live | 2036-09-23 | |
| Crag Avenue, Clondalkin SD13A/0271 | eir | SDCC | 59,239 | lapsed without commencement notice | 2019-07-21 |
| Ovens IDA estate 14/6757 | — | CORKCO | — | lapsed without commencement notice | 2020-02-23 |
| Staffordstown, Turvey F15A/0266 | McHale Partnership | FINGAL | 7,032 | lapsed without commencement notice | 2020-12-16 |
| Kevlin, Lifford 1850236 | — | DONEGAL | — | lapsed without commencement notice | 2023-02-24 |
| Crag Avenue, Clondalkin SD18A/0068 | Echelon (Crag Digital) | SDCC | 56,560 | lapsed without commencement notice | 2024-05-13 |
| Avoca River Park, Arklow 18940 | Echelon (Crag Digital Avoca) | WICKLOW | — | lapsed without commencement notice | 2024-07-16 |
| Mountkennedy, Newtownmountkennedy 10/2123 (via 24306) | — | WICKLOW | 111,228 | lapsed without commencement notice | 2024-07-30 |
| Damastown, Mulhuddart FW19A/0232 | — | FINGAL | 48,303 | lapsed without commencement notice | 2025-10-30 |
| Avoca River Park, Arklow 201285 | Echelon (Crag Digital Avoca) | WICKLOW | 47,580 | lapsed without commencement notice | 2026-03-21 |
| Kish Business Park, Arklow 201088 | — | WICKLOW | 66,630 | lapsed without commencement notice | 2026-06-09 |
| Wallingstown, Little Island 16/5011 | — | CORKCO | — | lapsed without commencement notice | 2026-07-28 |
| Derrydonnell, Athenry Athenry original permission (via 211047) | Apple | GALWAYCO | 30,138 | lapsed without commencement notice | 2026-08-04 |
Highlighted: permission still live but no construction started. Built = a Building Control completion certificate, not switch-on. Coverage is a floor: some data centres are described as "ICT facilities".
PlanSight planning register × Building Control (BCMS) commencement notices and completion certificates · as of 2026-10-10
What the planning inspectors found
The real detail on each project sits in An Coimisiún Pleanála inspector reports: power demand, grid connection, on-site gas, and why projects were refused.
Why projects were refused
663.6 MW of demand stated across the reports. 13 of 22 reports give no demand figure.
What on-site generation looks like
EirGrid's flexible connection offers require generation that can run for up to ~500 hours a year (EdgeConneX, 317802).
Art Data Centres, Ennis: ~200 MW, of which ~120 MW from 18 on-site gas engines and ~80 MW from the grid (314474).
Highlighted: the Board went against its inspector. MW figures aren't like for like (phase vs campus); each record notes its basis. Read by Claude from the reports; every quote checked against its page.
An Coimisiún Pleanála inspector reports and orders · as of 2026-10-03
Where the next one could go
Every enterprise zone of 5 ha or more, scored on what a data centre needs now: big land, a 220/400 kV substation, gas, and a cluster to join.
Top candidate zones, checked
Score = zoning (15, or 30 if data centres are named) + size (up to 20) + nearest 220/400 kV substation (up to 30) + gas (up to 10) + nearby data centres (up to 10) + IDA land (5), minus 15 inside Dublin's four councils (the constrained-grid hypothesis, not a rule). Proximity is not capacity; the score ignores headroom. Checked zones are then adjusted for protected nature areas, monuments, a large single parcel and public owners; land ownership and OPW flood maps are checked only in the Dublin area; outside it, owners and flood risk are unchecked. Black dots: 220 kV+ substations. Red: top zones. Small green/amber/red dots: ESB Networks' indicative demand headroom at 38 kV and 110 kV stations (not an offer; see Power → Where there is grid headroom).
PlanSight zoning (30 councils) · OpenStreetMap substations and gas pipelines (ODbL) · as of 2026-10-10