Data centres swallow 21% of Irish power

The cloud has never been weightless. Behind every AI chatbot answer sits a physical machine, often in a building the size of a warehouse, drawing power, shedding heat and asking a national grid to make room for it.

Europe is now trying to do two things at once. The EU wants to triple data centre capacity within five to seven years, from about 10 gigawatts today to as much as 35 GW by 2030, enough electricity demand for a mid-sized industrial country. It also wants those same centres to be climate-neutral by the end of the decade.

Two EU laws now pull against each other. The Cloud and AI Development Act, adopted in June, is designed to build more capacity. The Energy Efficiency Directive forces data centres to report their energy and water use and to recover waste heat, meaning the hot air from servers should be piped into local district heating systems rather than blown away. The political problem is simple enough. The engineering problem is not.

The Irish Warning

Ireland is where that contradiction has become visible first. A United Nations assessment this week described the State as "a live cautionary example" of what happens when data centre growth runs ahead of energy planning.

Data centres now use 21% of all metered electricity in Ireland, up from 5% in 2015. They consume more power than every urban household in the country combined.

That is not just a climate or infrastructure statistic. It lands on bills. Between 2015 and 2023, rising data centre demand added an estimated €715 million to Irish household electricity bills, or about €263 per household. Irish families pay nearly twice the per-unit rate paid by data centres, which quietly shifts grid costs from large users onto residential customers.

EirGrid, the national grid operator, expects data centres to account for 31% of national electricity use by 2034. That forecast is the warning other countries are now studying.

A Continent-Wide Bottleneck

Ireland is the sharpest example, but the pressure is spreading across Europe.

In the Netherlands, more than 14,000 applications from large energy users are sitting in TenneT's connection queue. Amsterdam has imposed a moratorium on new data centres. The Dutch parliament called for a crisis law, but the government split it into 26 legislative tranches and promised the first part "just after summer."

In Germany, data centres use 40% of Frankfurt's electricity. The city's utility cannot offer major new grid connections until the mid-2030s. Watchdog groups AlgorithmWatch and LobbyControl found that lobbying language from Google and Microsoft was adopted almost word for word into draft legislation weakening the Energy Efficiency Act, including proposals to treat consumption data as trade secrets.

France believes its nuclear fleet can make it Europe's AI infrastructure hub. President Emmanuel Macron secured about €90 billion in data centre investment commitments at the Choose France summit. But RTE, the French grid operator, is already dealing with structural bottlenecks: 9 GW of capacity under contract or review, compared with just 1.3 GW installed today.

In Italy, grid operator Terna has more than 50 GW of connection requests, about half of them from data centres. Lombardy responded in May with what may be Europe's first regional data centre law, doubling construction fees on agricultural land and banning public drinking water for cooling.

Tightening the Screws

EU regulation is beginning to catch up with the physical reality. Since May 2024, every data centre drawing more than 500 kilowatts of computing power, which excludes only the smallest sites, has had to report energy and water use each year. By August 2027, each will carry a public sustainability label from A to G. The Commission plans to propose binding efficiency standards by 2027, the first performance floors for the sector.

The question is whether enforcement will match the paperwork. Germany has started fining operators that fail to report. Most member states have not.

Finland shows how delicate the bargain has become. Its clean grid and cold climate make it attractive for data centres. But when Helsinki raised the electricity tax on the sector, Google paused major planned investments within months.

The same governments competing for AI investment now have to limit its demand for power, water and land. The Cloud and AI Development Act gives Europe's data centre boom a legal push. The grid is setting the actual speed limit.