Summary

• Ireland’s planning commission has approved Google’s proposed 72,400-square-metre expansion at Grange Castle after overturning a 2024 council refusal.
• Data centres consumed 23% of Ireland’s metered electricity in 2025, up from 5% a decade earlier, according to the Central Statistics Office.
• Ireland’s connection policy now requires new data centres to support generation or storage and source at least 80% of annual demand from additional Irish renewable projects.

Google has won planning approval for a third phase of its Dublin data-centre campus after a two-year dispute over grid capacity and sustainability, reopening a major infrastructure project just as Ireland imposes tougher conditions on the electricity demand created by new facilities.

Google sought ten-year permission for a 72,400-square-metre data storage facility at Grange Castle Business Park South, but South Dublin County Council rejected the application in August 2024. An Coimisiún Pleanála has now overturned that refusal following an appeal by Google Ireland.

The original council decision cited insufficient capacity in the electricity network and the absence of significant on-site renewable generation among its concerns. Google argued during the appeal that it had secured a grid connection from EirGrid in 2021 and that the local authority was not the appropriate body to determine whether the national network had enough capacity for the project.

Planning approval comes with conditions rather than a clear path to immediate construction. Google must provide evidence of engagement around power-purchase agreements before development starts, use renewable fuel for backup generators, introduce measures encouraging staff to use public transport, cycling, and walking, and implement environmental mitigation around the site. The decision may also remain open to judicial review.

Ireland’s data-centre equation has changed

The dispute around Grange Castle reflects how far the economics of data-centre development in Ireland have shifted from property and connectivity into electricity policy. Central Statistics Office figures show that data centres consumed 7,663GWh of metered electricity in 2025, 10% more than in 2024, while all other metered users increased consumption by 2%.

That put data centres at 23% of Ireland’s total metered electricity use in 2025, compared with 5% in 2015. Their consumption has risen every year over that period, more than doubling between 2015 and 2019 before tripling again between 2019 and 2025.

The scale means individual planning decisions now sit inside a larger question about how Ireland allocates grid capacity between households, industry, electrification, and digital infrastructure. Google’s project may have secured planning approval, but development remains tied to an electricity system in which large new loads can no longer be treated simply as another commercial connection.

Ireland’s Commission for Regulation of Utilities formalised that shift in December 2025 through a new connection policy for data centres. New facilities seeking grid access must provide generation or storage capacity, either on-site or nearby, broadly matching their requested maximum import demand, with that capacity participating in the wholesale electricity market.

The policy also requires data centres to meet at least 80% of annual electricity demand using additional renewable projects located in the Republic of Ireland. Developers have a six-year glide path for those renewable assets to begin generating, recognising that wind, solar, and related projects cannot be commissioned on the same timetable as a server hall.

Grid access is becoming part of site selection

Location now carries greater regulatory weight. EirGrid and ESB Networks must assess whether proposed connections sit in constrained or unconstrained parts of the network and regularly publish information about current and future capacity, replacing a broader regional approach with more project-specific grid analysis.

The CRU expects data-centre electricity demand to rise from 9.4TWh in 2025 to 14.6TWh in 2034 based on contracted demand, which would take the sector from 22% of national electricity demand in 2024 to a projected 31% by 2034. Those forecasts do not guarantee that every proposed facility will be built, but they explain why grid policy is becoming inseparable from data-centre investment.

That constraint is spreading across Europe as AI and cloud infrastructure increase both the quantity and density of computing demand. As Europe’s AI infrastructure build-out increasingly runs through the electricity grid, the competitive advantage of a location depends not only on fibre routes, tax policy, engineering talent, and land but on whether new megawatts can actually be delivered on commercially useful timescales.

Google has operated in Dublin since acquiring land and an existing building in 2011, opening its first data centre the following year and announcing a second facility in 2014. The proposed Grange Castle expansion would extend an established campus rather than create an entirely new Irish presence, with the planning application estimating up to 50 operational jobs alongside hundreds of construction roles.

Approval does not remove the energy constraint

Overturning the council’s refusal resolves one part of Google’s development process, but it does not eliminate the infrastructure conditions that produced the dispute. Planning permission, grid connection rights, renewable procurement, backup generation, and eventual construction each operate on different timetables and through different authorities.

That distinction is becoming important across large digital-infrastructure projects. A planning consent confirms that a facility can be developed subject to its conditions; it does not create new transmission capacity, accelerate renewable generation, or guarantee that every element of the commercial plan will proceed unchanged.

Ireland is trying to preserve the economic role of a large data-centre sector while preventing its power demand from outrunning generation and network development. The result is a model in which developers are being asked to bring more of their own energy solution with them, rather than relying on the grid to absorb whatever load arrives.

Google’s Grange Castle appeal has therefore ended with permission to expand, but the argument surrounding it has not disappeared. With data centres already consuming nearly a quarter of Ireland’s metered electricity, the next phase of the country’s digital infrastructure will be decided as much by energy availability and additional generation as by demand for compute.