Microsoft Grange Castle Data Centre Campus
operational CampusOperated by Microsoft
Microsoft's Grange Castle campus is one of Ireland's largest data centre clusters, held under multiple EPA industrial emissions licences, with council-approved expansion phases since 2019.
Land use jurisdiction: South Dublin County Council
Measurements on record
No disclosed measurements on record yet.
Permitting path
Approvals on record for 2 of 11 path steps.
Ireland's path runs grid-first: under the CRU's Large Energy Users Connection Policy (CRU/25/236, December 2025, replacing the 2021 data centre connection direction), a new connection offer requires dispatchable generation or storage matched to the facility's import capacity and a commitment to source at least 80 percent of annual demand from new Irish renewable generation within six years of energisation. Planning permission sits with the local authority in the first instance (the 2018 provision routing large data centres directly to the national planning body is not yet commenced), with appeals to An Coimisiun Pleanala, and environmental impact assessment where screening requires it. Uisce Eireann water and wastewater connections, building control certificates, and an EPA industrial emissions licence for standby fleets over 50 MW thermal complete the path.
| Date | Step | Authority | Instrument | Status |
|---|---|---|---|---|
| Grid connection application | not yet requested | |||
| Connection offer and agreement | not yet requested | |||
| Dispatchable generation or storage matched to import capacity applies for new connection applications under the 2025 policy |
not yet requested | |||
| Renewables matching commitment (80 percent in six years) applies for new connection applications under the 2025 policy |
not yet requested | |||
| Strategic infrastructure pre-application consultation applies where an associated Seventh Schedule class, such as large scale onsite generation, routes the application to An Coimisiun Pleanala; the data centre specific route is not yet commenced |
not yet requested | |||
| Environmental impact assessment applies where screening determines significant effects are likely |
South Dublin County Council | not yet requested | ||
| Planning permission | South Dublin County Council | South Dublin County Council decision, three data centres, Grange Castle South Business Park (2019)
South Dublin County Council decision, three data centres, Grange Castle South Business Park (2019) |
on record | |
| Uisce Eireann wastewater connection | not yet requested | |||
| Uisce Eireann water connection agreement | not yet requested | |||
| Building control (commencement notice; fire safety and disability access certificates) | South Dublin County Council | not yet requested | ||
| EPA industrial emissions licence applies where standby generation crosses licensing thresholds |
Environmental Protection Agency | EPA IE Licence P1190-01 (DUB3-5 site)
EPA IE Licence P1190-01 (DUB3-5 site) (original) |
on record |
Steps without a record are shown as not yet requested or not on record: absence of a record here is a records gap, not a finding about the facility. An authority shown for an empty step is the body that would issue it.
About this path and the law behind each step: law.ungovr.org/compute/ie
Location and sources
Clondalkin, South Dublin County Council, Ireland
Sources: EPA licence record (Microsoft Operations Ireland, Grange Castle) · DataCenterDynamics: SDCC approves three data centres at Grange Castle
Every record links to its source: openly licensed datasets (Epoch AI, CC BY; Wikidata, CC0; US EPA, public domain) and public permit records. Full sourcing and licensing: methodology · sources.