Data centre · Mayo · 54.1914, -9.2207
Avaio Digital Killala
lapsed Avaio Digital Our classification · status
Not available for this site: measured grid draw (no EPA annual report: only sites with ≥50 MWth of plant file one); mapped footprint; rates (no valuation-list entry matched).
Why we say it's lapsed
- Planning 2460708: refused (decisionSource: ACP case page 2026-09-15 (snapshot 2026-10-06))
Who runs it
- planning applicant 'Mayo Data Hub Limited' -> Avaio Digital (operator SPV; high-confidence entity link from planning, press)
What the planning and licence documents say
Single 29,076m2 data centre building (Mayo 24/60708), granted by Mayo CC and refused on appeal (ABP-322575-25).
| Spec | Value | Quote and source |
|---|---|---|
| IT load | 40 MW | "The facility would require c.50MW average electrical power to operate and an IT load of 40 MW." ACP 322575 inspector report, p.7 |
| Electrical demand | 58 MW | "nominal IT capacity of 40MW, which would require 58MW of maximum import capacity from the grid and demand 50MW of power" ACP 322575 inspector report, p.40 maximum import capacity per applicant's appeal response; c.50MW average |
| Grid voltage | 110 kV | "power supply for the development would be provided from the national grid via the 110kV line from Moy110kV to Tawnaghmore Power Station" ACP 322575 inspector report, p.7 |
| Connection point | 110kV line Moy-Tawnaghmore; future on-site 110kV GIS substation reserved (separate application) | "power supply for the development would be provided from the national grid via the 110kV line from Moy110kV to Tawnaghmore Power Station" ACP 322575 inspector report, p.7 no EirGrid connection agreement; cited in refusal |
| On-site generation | backup / dispatchable dual-fuel generators | "accommodating 25. no. backup / dispatchable generators and associated flues" ACP 322575 inspector report, p.8 |
| Generating units | 25 units | "accommodating 25. no. backup / dispatchable generators and associated flues" ACP 322575 inspector report, p.8 |
| On-site output | 75 MW | "They have the potential to operate for up to 400 hours and generate 75 MW." ACP 322575 inspector report, p.8 |
| Fuel | HVO and gas (dual fuel) | "The generators would be dual fuel powered by Hydrotreated Vegetable Oil (HVO) and gas" ACP 322575 inspector report, p.8 |
| Running hours | 400 h/yr | "They have the potential to operate for up to 400 hours and generate 75 MW." ACP 322575 inspector report, p.8 inspector p51 states 400 hours per year |
| Cooling | closed-loop water system with roof chillers | "closed loop water circulatory system with roof chillers forming the primary cooling solution" ACP 322575 inspector report, p.7 |
| Floor area | 29,076 m2 | "with an overall gross floor area of c. 29,076 sq.m across two levels" MayoCC ePlan register entry 2460708 (development description), p.1 |
| Dates | refused on appeal 15/09/2026 | "Appeal Decision: REFUSED Decision Date: 15/09/2026" MayoCC ePlan register entry 2460708 (development description), p.1 Mayo CC had granted 25/04/2025 |
| Heat reuse | perimeter pipework for possible future district heating (MCC condition 10) | "install a suitable pipework at the site’s perimeter to facilitate a district heating system, if deemed necessary" ACP 322575 inspector report, p.11 |
| Renewables | 50kW rooftop PV only; no CPPA evidence | "The solar panels are stated as having an input of 50kW." ACP 322575 inspector report, p.8 |
Every value is quoted from the document and page cited; the quote was checked against that page's text. "Derived" means the reader worked it out from stated figures (shown in the quote). Planning and licence figures are design or permitted values, not measured use; values derived from an EPA annual environmental report (AER), mostly water, are reported use for that year. The note under each quote gives the scope and whether a demand figure is a maximum or an average.
Planning history
| Received | Ref | What | Decision | Built? |
|---|---|---|---|---|
| 2024-11-21 | 2460708 | The construction of a single data centre building located to the north of the site, with an overall gross floor area of c. 29,076 sq.m across two levels and an overall maximum height of c. 22.764m at parapet level. The data centre building includes data halls and associated electrical and mechanical plant rooms (c. 23,908 sq.m), an administrative and staff services block (c. 5,052 sq.m) and circulation and stairs (c. 116 sq.m). 2 no. external terraces are proposed to the east of the building (c. 309 sq.m) and an external generator yard to the south of the building (c. 5,205 sq.m) accommodating | CONDITIONAL | refused |
Sources for this page
planning:MAYO/2460708 · acp:322575
Joined from OpenStreetMap, the planning register, An Coimisiún Pleanála, EPA licences and annual reports, the Tailte Éireann valuation list and Building Control. Data built 2026-10-10.