Ireland's data centres used 5 per cent of the country's metered electricity in 2015, but by 2025 they were using 23 per cent — more than every urban household in the country put together

According to Ireland’s Central Statistics Office, data centres went from 5% of the country’s metered electricity in 2015 to 23% in 2025. That one figure carries most of the story.

The comparison that sharpens it: in 2025, all the homes in Ireland’s towns and cities used 18% of metered electricity. Rural homes used another 9%.

So the buildings full of servers, most of them clustered around Dublin, now pull more power than every urban household in the country combined. Add rural homes back in and all households together come to 28%, still just ahead of the data centres.

What the CSO actually counted

The numbers come from a CSO report published on 7 July 2026, built on meter data from ESB Networks.

As the agency’s statistician Dr Grzegorz Głaczyński put it, “Newly compiled quarterly figures spanning 2015 to 2025 highlight a substantial increase in metered electricity consumption by data centres.” In raw terms, that use climbed from 1,240 GWh in 2015 to 7,663 GWh in 2025.

The climb has been remarkably steady. As noted in the post, “Data centre 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.”

For comparison, over that decade, Ireland’s total metered electricity use grew by 34%. The data centres didn’t just grow with the grid. They outran it.

How Ireland became the servers’ home

Ireland spent years making itself attractive to the multinationals that build and use these facilities. A historically low corporate tax rate, an English-speaking workforce, fibre connections and a strong technology sector helped establish the country as a European base for major digital companies.

As of April 2024, Ireland had 82 operational data centres, with the overwhelming majority clustered in the Greater Dublin Area. The concentration is what turned their electricity demand from an industrial statistic into a grid-planning problem.

The growth is still speeding up

In 2025, data centre electricity use rose 10% in a single year, from 6,973 GWh to 7,663 GWh. Consumption by all other users, including homes and businesses, grew by 2% combined.

Widen the lens and it looks larger still. The CSO’s “Large Energy Users” group, which includes significant data centres alongside other heavy users, reached 33% of total metered use in 2025.

The grid problem and the Dublin freeze

Regulators saw the pressure coming. From 2021, Ireland’s grid operator effectively blocked new data centre connections around Dublin because of constraints on the electricity system. The freeze ended in December 2025, when it was replaced by a new national connection policy.

The new rules come with substantial conditions. The Commission for Regulation of Utilities requires new data centres to provide generation and/or storage capacity matching their requested maximum import capacity. They must also meet at least 80% of their annual demand with additional renewable electricity projects in Ireland, with a six-year glide path to reach the requirement.

The striking part is that consumption still reached 23% despite years of connection restrictions. Existing centres expanded, previously contracted projects continued to connect, and demand kept rising. The CRU now cites an EirGrid forecast in which data centre electricity demand rises to 31% of national electricity demand by 2034.

The hidden bill behind the services

Cloud storage, streaming, video calls, search, and increasingly the training and running of AI models all feel almost weightless when we use them. These figures are a reminder that the infrastructure behind them is not.

In Ireland, it now uses more electricity than every urban household in the country.

That leaves a real trade-off rather than a tidy answer. Ireland built an economy that welcomed digital infrastructure, and now hosts an industry whose electricity demand is growing far faster than most other users. Keep expanding it and the grid has to grow alongside it. Slow it down and Ireland constrains a sector closely tied to the multinational technology companies it spent decades attracting.