Google wins Dublin planning appeal for a third Grange Castle data center

Google has won its planning appeal for a third data center at Grange Castle Business Park on the strength of a grid connection the company says it secured in 2021. An Coimisiún Pleanála, the state planning appeals body until recently known as An Bord Pleanála, granted permission for a 72,400 sqm (779,310 sq ft) facility, as Data Center Dynamics reports, citing The Irish Times, roughly two years after South Dublin County Council turned the same application down.

Google filed the plan in June 2024 and lost it that August, when the council cited insufficient capacity in the electricity network, too little on-site renewable energy to power the building, uncertainty around Google's power purchase agreements in Ireland, and no connection to the surrounding district heating network. The company appealed on the argument that it had secured the necessary grid connection in 2021, and that argument carried. Conditions attach: evidence of engaging in power purchase agreements ahead of development, renewable fuel for the standby generators, measures encouraging staff to walk, cycle or take public transport, and an improvement in the ecological value of the site.

The application was lodged in the middle of EirGrid's de facto moratorium on new data centers, under which the state-owned grid operator said it would not grant any new application requests until 2028. Permission arrived anyway, and the appeal turned on a connection the company says it lined up years earlier. This publication has argued grid access has become an asset in its own right. The queue position was the asset, and the planning appeal was where it got spent.

Grange Castle is not a new front. Google has run data centers there since 2012, having announced plans in 2011 to convert a warehouse on the site, and it won permission for a second facility in 2014; the company has said it invested around €500 million ($535.3 million) in the campus. A third building would extend a commitment that runs back more than a decade. The conditions suggest the planning system's answer to Ireland's data center argument is narrower than a yes or a no: approval on sites where the power question is already answered.

Two of the conditions named in the coverage are energy conditions rather than land-use ones, and both answer objections the council raised in 2024: one requires evidence of power purchase agreement engagement ahead of development, the other renewable fuel for the backup generators. That reads as the appeals process being used to extract the procurement detail the council found missing, and it moves the offtake conversation into the entitlement file rather than leaving it to be settled after construction starts.

The coverage attaches no capacity figure, no load number and no contracted supply volume to the Dublin building, which is normal for a planning decision and also why the conditions carry the weight they do: the only power-related commitments in the ruling are documentary, so the supply story behind the third building is not yet public.

A second reading of those conditions is less comfortable for the developer: a requirement written into a permission becomes a milestone in a schedule that tenants and lenders read, so a campus approved on the strength of documented PPA engagement inherits a compliance task that sits with Google rather than with whoever leases the space. In a market where power contracts are the scarce input, that is a term other planning authorities could borrow.

Google is not beginning that work from nothing: it has contracted 396 megawatts at Fervo Energy's Cape Station and is funding a virtual power plant with PG&E, and the pattern in its American activity has been getting in line for power ahead of construction rather than after. Whether Irish contracting moves at the same pace is a separate question, and the conditions put the Dublin record on the file.

The ruling exposes a divide between files opened before the door narrowed and files opened now. Google applied in June 2024 with a 2021 connection claim attached; a developer filing fresh in Dublin faces EirGrid's stated 2028 line, and the concerns South Dublin County Council raised two years ago have not gone away. The practical effect looks selective: a campus with a prior connection can expand through conditions and appeals, while a greenfield site waits.

Google framed the result as continuity: a spokesperson said data centers are an essential part of Ireland's digital economy, and that the company looks forward to the next steps as it continues investing to meet demand for its services. The next milestone is documentary: evidence of PPA engagement has to be produced ahead of development, the standby generators have to run on renewable fuel, and EirGrid's position remains the backdrop for every application behind this one. Grange Castle's third building has cleared planning; the power supply that the refusal was about still has to be shown in writing.