Irish Data Centers Consume 23% of National Electricity in 2025, Despite Grid Moratorium

Electricity consumption by data centers in Ireland surged by 10 percent in 2025, even as a near-total moratorium on new grid connections remained in effect around Dublin, according to new data from the Central Statistics Office (CSO). The figures underscore the growing tension between the country’s ambition to remain a European tech hub and the strain placed on its energy infrastructure by the rapid expansion of server farms.

The CSO reported that data centers now account for 23 percent of Ireland’s total metered electricity consumption, up from 20 percent in 2023 and 14 percent in 2021. In 2015, the sector represented just 5 percent of national power use. The absolute volume of electricity consumed by data centers rose from 6,973 gigawatt hours (GWh) in 2024 to 7,663 GWh in 2025. By comparison, all other customer categories combined recorded a mere 2 percent increase in electricity use over the same period.

“Datacenter consumption has grown every single year without exception, more than doubling between 2015 and 2019 from 1,240 GWh to 2,490 GWh, and tripling again between 2019 and 2025, reaching 7,663 GWh,” said Grzegorz Głaczyński, a statistician in the CSO’s Climate and Energy Division. The data also reveals that data centers now consume more electricity than urban households, which accounted for 18 percent of metered use, and more than double the 9 percent share attributed to rural households.

The surge in demand led the Commission for Regulation of Utilities (CRU) to impose an effective moratorium on connecting new data centers to the grid in the Dublin area, where most of the activity is concentrated. This restriction was lifted in December 2025, meaning the 10 percent rise in consumption occurred while the moratorium was in place for nearly the entire year. At one point, concerns had mounted that the ever-expanding facilities could consume as much as one-third of Ireland’s electricity by now.

Under stricter new regulations introduced alongside the lifting of the moratorium, data center operators seeking a grid connection of more than 10 MW must now provide on-site generators or battery systems capable of matching that capacity. These systems are also required to feed power back to the national grid when requested, a model already pioneered by Microsoft and Digital Realty. The move reflects a broader effort to balance the economic benefits of data center investment with the need to maintain grid stability and meet climate targets.

Ireland, a country of just over 5 million people, is now home to more than 80 data centers, a density that has fueled public protests. Similar opposition is emerging internationally; in the United States, the Trump administration has been working to defuse public concerns by asking major tech companies to commit that their expanding data center estates will not spike energy bills or drain local water supplies.