Data centres across Ireland consumed almost one billion litres of water over the past year, according to an investigation published by The Journal. The findings, drawn from utility and planning records, put fresh scrutiny on an industry that has already faced years of criticism over its outsized appetite for electricity.
The scale of water use had not previously been compiled in one place, and the investigation’s authors say it exposes a gap in public reporting on how much of the country’s water supply is being diverted to server farms rather than households or other industries.
Where the Water Goes
Data centres rely on water for cooling systems that keep servers from overheating, particularly during warmer months or periods of high computing demand. Some facilities use water-based evaporative cooling, which loses water to the atmosphere and must be continuously replenished, while others use closed-loop systems that recycle water with smaller ongoing draws.
Ireland has become one of Europe’s largest data centre hubs, with the bulk of facilities clustered around Dublin to take advantage of subsea cable connections, favorable tax treatment, and a temperate climate that reduces cooling costs compared with warmer regions. That concentration means the water demand identified in the investigation is not spread evenly across the country but falls heavily on the Greater Dublin Area, where Uisce Éireann has repeatedly warned of tight supply margins.
Growing Concerns Amid Water Stress
The report lands at a sensitive moment for Irish water policy. Dublin’s water infrastructure has been operating close to capacity for several years, and officials have periodically urged households to conserve water during dry spells. Critics argue that allocating large volumes of water to data centres, many of them owned by multinational technology firms, competes directly with residential and agricultural needs.
Campaigners and some local councillors have called for tighter conditions on future planning approvals, arguing that water and electricity impacts should be assessed together rather than in isolation.
Data centres already account for a substantial share of national electricity demand, a figure that has drawn sustained attention from EirGrid and energy regulators in recent years. The new water figures suggest the resource pressure extends well beyond the power grid, adding a second front to the debate over how much capacity the country should devote to hosting cloud computing and, increasingly, artificial intelligence workloads.
An Industry Under Pressure to Expand
The timing is notable given the broader surge in data centre construction driven by AI demand. Major technology companies have been racing to add computing capacity worldwide, a trend that has also driven cost pressures elsewhere in the sector — including at firms like Oracle, which recently cut 21,000 jobs amid a costly AI buildout. Industry analysts say the same AI-driven expansion fueling layoffs and capital spending decisions abroad is also pushing operators to seek new sites in Ireland, where existing infrastructure and grid connections make expansion easier than starting from scratch elsewhere.
Industry representatives have pushed back on characterizations that data centres are draining scarce resources, noting that many newer facilities use air-based or hybrid cooling systems specifically to reduce water consumption, and that some operators have invested in their own water recycling infrastructure. Trade groups have also argued that data centres support thousands of jobs and significant tax revenue, and that Ireland’s broader digital economy strategy depends on maintaining the country’s position as a hosting location.
What Regulators Are Weighing
Local authorities and national regulators are now facing calls to require more detailed water impact assessments before approving new facilities. Some planning applications already include water usage projections, but critics say enforcement and public reporting after construction have been inconsistent, making it difficult to verify actual consumption against original estimates — a gap the investigation’s near-billion-litre figure was partly an attempt to close.
Environmental groups have pointed to the finding as evidence that Ireland needs a coordinated national policy linking data centre approvals to both grid capacity and water supply planning, rather than treating each application on a case-by-case basis. Government officials have not yet announced any changes to planning rules in direct response to the report, though the figures are likely to feature in ongoing discussions about the country’s data centre moratorium debates and future energy and infrastructure planning.
What’s Next
For now, the roughly one-billion-litre figure functions mainly as a benchmark — the first time water use across the sector has been estimated at a national scale. Whether it leads to new reporting requirements or tighter conditions on future developments will likely depend on how utilities, regulators, and the data centre industry respond in the coming months, as demand for computing capacity in Ireland shows no sign of slowing.
