17JUN

Ireland refuses €1.5bn Mayo data centre

1 min read

10:13UTC

Ireland's planning appeals body refused a €1.5bn data centre at Killala, County Mayo, because the developer showed no fixed grid connection and no renewable power contract.

← Back to Virginia taxes the backup, not the draw Jump to analysis ↓

IndustryAssessed

Key takeaway

Ireland's planning appeals body refused a data centre that could not prove grid capacity or renewable supply.

An Coimisiun Pleanala, Ireland's national planning appeals body, refused a €1.5bn data centre at Killala, County Mayo, on 17 September, overturning Mayo County Council's 2025 grant⁠¹. The applicant, Mayo Data Hub, is backed by Avaio Digital.

The board found the developer had shown no fixed grid connection agreement and no proof that the grid could serve the site, RTE News reported. It also found the project had not shown it would meet the objectives of Ireland's Climate Action Plan 2025, citing the absence of any corporate PPA (power purchase agreement) with a renewable supplier.

Ireland's energy regulator, the Commission for Regulation of Utilities, had been consulting on grid-code obligations that EirGrid would impose on large demand sites such as data centres. Killala moves those tests forward to the planning stage. An Irish applicant now faces a demand for grid and power-purchase evidence at the planning stage, before any connection offer.

Deep Analysis

In plain English

Ireland's national planning appeals board rejected a €1.5bn data centre planned for Killala in County Mayo, even though the local county council had already approved it last year. The board's reasons were about power, not politics: the developer had no confirmed grid connection agreement, and no signed contract to buy renewable electricity. This matters beyond Mayo because it shows Ireland's appeals process is now applying the same tough grid and renewable-energy tests used around Dublin to projects anywhere in the country, even regions once seen as an escape route from Dublin's stricter rules.

Deep Analysis

Root Causes

Ireland's grid has operated under an effective restriction on new large-load connections around Dublin since 2021, pushing developers toward the regions; Mayo Data Hub tried to build outside that constrained zone but still needed the grid operator to confirm the west of Ireland's thinner transmission network could serve a €1.5bn campus, and went to appeal without that confirmation in hand.

The refusal also rests on the absence of a corporate power-purchase agreement, a financing instrument rather than a planning requirement in most jurisdictions; treating a missing PPA as grounds for refusal signals Ireland now expects developers to prove renewable electricity is contracted, not merely available, before construction can begin.

Source Landscape

This story draws on mixed-leaning sources from Ireland

Ireland

LeftRight

Consensus view: An Coimisiun Pleanala's ruling tracks Ireland's grid operator, which has restricted new large-load connections around Dublin since 2021 and told developers elsewhere that a planning grant without a firm connection offer is not bankable; Mayo Data Hub's lack of a signed agreement was the fact the appeals board treated as decisive.

Counter-view: Mayo County Council's 2025 grant, which this ruling overturns, judged the project on land use and local economic benefit, the criteria it is statutorily required to weigh; the counter-case is that national grid policy should not retrospectively unwind a decision a county council had no power to make itself.

Key tension: Whether Ireland's national appeals board will keep applying a grid-and-contract test county councils cannot themselves enforce, effectively centralising data-centre planning decisions regardless of where a project sits.

Sources:RTE News·RTE News

Mentions:Dublin →EirGrid →Ireland →An Coimisiun Pleanala →Killala →Mayo Data Hub →Avaio Digital →Climate Action Plan 2025 →Mayo County Council →RTE →

First Reported In

Update #15 · Texas freezes data-centre permits

RTE News· 24 Sept 2026

Read original →

Causes and effects

Caused by

Ireland writes the grid rules into contracts

Grid-code obligations regulators were writing into connection rules became grounds cited in the Killala refusal.

Occurred 29 Jul 2026

Read story →

This Event

Ireland refuses €1.5bn Mayo data centre

In An Coimisiun Pleanala's decision, missing grid-capacity evidence and a missing renewable PPA became grounds to refuse planning permission, ahead of any grid connection.

Different Perspectives

Chilean data-centre developers

Seven projects, one linked to Google, asked SEA this month for rulings that they fall outside full environmental review; four declared diesel-storage volumes just under the review-triggering tonnage, mirroring the mechanism Alto Jahuel used in July. The clustering suggests the threshold is being engineered, not sized to need.

An Coimisiun Pleanala

Ireland's planning appeals body refused the €1.5bn Killala data centre on 17 September, overturning Mayo County Council's 2025 grant for lack of a fixed grid-connection agreement and no corporate renewable power-purchase agreement. The ruling makes matched-power evidence, not planning consent alone, the deciding factor.

Housing Assembly and Foxglove

The two groups' 6 August appeal, filed through the Legal Resources Centre, kept Cape Town's approval of Equinix's data centre suspended through this window over missing water, emissions, noise and diesel-generator data. Deputy Mayor Eddie Andrews confirmed on 20-21 September that the suspension holds.

Brazil (President Lula, signing Redata)

Lula signed Lei 15.504 on 15 September, creating the Redata tax programme and keeping the Senate's water cap with no veto, while Aneel authorised Scala's AI City to join the national grid from January 2028. Brazil is recruiting capacity other markets are now turning away.

Aragon regional government (Eva Valle)

Aragon's economy chief Eva Valle said on 11 September that Spain's draft decree, requiring 80% hourly-matched renewables via a 10-year power-purchase agreement, is unmeetable by any project and threatens Blackstone, Azora and Microsoft builds already under way. Aragon holds 3,600 MW of granted grid access against 108 MW built.

Texas Governor Greg Abbott

Abbott ordered TCEQ on 21 September to halt every pending data-centre permit until projects pay their own way and complete ERCOT and Texas Water Development Board audits. Texas built the country's most permissive data-centre market; freezing it signals even that market has hit its grid limit.